Eco-Industrial Park (EIP) Development in Viet Nam: Results and Key Insights from UNIDO’s EIP Project (2014–2019)

: Industrial parks have been promoted as cornerstone strategies for economic development in countries around the world, including Viet Nam. The transformation of conventional industrial zones (IZs) into eco-industrial parks (EIPs) presents an e ﬀ ective opportunity to attain inclusive and sustainable industrial development, as well as increasing the economic competitiveness and resilience of industrial parks. This paper presents and discusses the interventions, key results, and lessons learned from the Ministry of Planning and Investment (MPI) and UNIDO’s work on EIPs in Viet Nam as part of the Project “Implementation of eco-industrial park initiative for sustainable industrial zones in Viet Nam”. The Project was undertaken with the objective of developing policies and guidelines to facilitate the transformation of industrial zones into eco-industrial parks and implementing EIP principles in ﬁve existing industrial zones in the provinces of Da Nang (Hoa Khanh IZ), Can Tho (Tra Noc 1 and 2 IZs), and Ninh Binh (Khanh Phu IZ and Gian Khau IZ), which serve as pilots to support replication and upscaling across Viet Nam. The application of the Project’s policy, company, and park-level interventions demonstrated their value in contributing to the development and implementation of EIP practices in the country. Rather than stand-alone solutions, multi-disciplinary EIP concepts are most e ﬀ ective if applied as part of an integrated top-down approach (policy support as entry point for interventions) combined with a bottom-up approach (industrial park as entry point). The issuance of Decree 82 / 2018 / ND-CP on the management of industrial parks and economic zones is a new policy outlining the requirements and process for transforming industrial zones into EIPs. The Decree is thereby an important driver for EIP development. Legal challenges with regards to EIPs still exist, including the lack of available and reliable data and the need for detailed standards and guidelines on reusing by-products, wastes, and wastewater. The ﬁnal adoption of minimum EIP requirements in Viet Nam for social, economic, and environmental aspects is a key issue for scaling up implementation. The work undertaken as part of the Project will continue through the Global EIP Programme, in which Viet Nam is one of the participating countries.


Introduction
The EIP concept and approach have evolved over time to address interrelated aspects, including, for example: resource efficient and cleaner production (RECP); industrial symbiosis; climate change; pollution; social standards; shared infrastructure; improved spatial zoning; and management. Different terminologies and definitions are used around the world to refer to eco-industrial parks and related concepts (e.g., sustainable industrial zones, green manufacturing clusters) [1][2][3][4][5][6][7][8][9]. In general, all definitions refer to a number of companies located in a defined area and all definitions share many similarities, opportunities, and challenges in the path to sustainable industrial development.
Having a formalized and well-functioning zone/park management structure is a key requisite for any EIP [6,10,11]. Park management assists EIPs and their tenant companies to take advantage of opportunities associated with RECP, industrial symbiosis, integration with local community and natural environment, spatial planning/zoning, and park level infrastructure and utility services. Although the focus of this paper is on existing industrial parks, the EIP concept is relevant to retrofit and optimize existing industrial parks (brownfields) as well as to guide the sustainable planning and development of new industrial parks (greenfields) [11][12][13].
Article 2 of Decree 82/2018/ND-CP [14] defines EIPs for the purposes of Vietnamese laws and government policies as follows: "Eco-industrial park means an industrial park in which enterprises get involved in cleaner production, make effective use of natural resources and enter into manufacturing cooperation and affiliation in order to tighten industrial symbiosis to promote economic, environmental and social efficiency in these enterprises." This is in line with the EIP definition commonly applied internationally [6,10] which recognizes the importance of the three pillars of sustainable development (economic, environmental, social) and of integrating EIP considerations into all phases of the development and operations of industrial parks.
International good practices illustrate that the types of economic, environmental, and social benefits from EIPs vary significantly, going well beyond the conventional business case benefits [8,15,16]. The benefits are not only commercial but also strategic, leading to reduced exposure to risk, increased competitiveness, business development, production continuity, and an improved reputation among key stakeholders. By working together, the business community works toward collective benefits greater than the combined benefits of each company [17][18][19][20].
This paper presents and discusses the interventions and key results from MPI and UNIDO's work, as the specialized UN agency dealing with sustainable industrial development, on EIPs in Viet Nam as part of the Project "Implementation of eco-industrial park initiative for sustainable industrial zones in Viet Nam" (hereafter referred to as "the Project'"). The paper also provides lessons learned and insights to guide future EIP interventions in the country and the region, distilling them to support replication and upscaling efforts. The Project was undertaken from October 2014 to June 2019 with the objective of developing policies and guidelines to facilitate the transformation of IZs into EIPs and implementing EIP principles in existing IZs. Five IZs were selected to launch EIP pilot projects, namely Khanh Phu IZ and Gian Khau IZ (Ninh Binh), Hoa Khanh IZ (Da Nang) and Tra Noc 1 and 2 IZs (Can Tho).

Challenges
Over the past decade Viet Nam has experienced rapid economic growth driven mainly by the processing and manufacturing sectors. Industrial zones (including industrial parks, special economic zones, EIPs, technology parks, and innovation districts) have been promoted as cornerstone strategies for the economic development in countries around the world, including Viet Nam. To facilitate the establishment of new industries, the Government created industrial zones (IZs), which now account for 38% of the country's GDP [21]. However, industrial activities have also had negative repercussions for the environment and for human health. Inefficient management of resources has increased greenhouse gas (GHG) emissions and has caused water and soil pollution. The transformation of conventional industrial parks into EIPs presents an effective opportunity to attain inclusive and sustainable industrial development and to meet the objectives of the 2030 Agenda and the Sustainable Development Goals (SDGs).
Viet Nam is one of the most energy-intensive countries in East Asia, with the energy consumption tripling over the past decade. Industrial growth has been one of the key drivers of Viet Nam's increasing energy intensity, accounting for 48% or almost half of the energy use. By 2030, Viet Nam's overall GHG emissions are expected to increase five-fold, per capita emissions four-fold, and the carbon intensity of GDP by 20%. Rapid industrialization in coastal areas has contributed to the deterioration of coastal water quality. Around 70% of the total industrial effluent is generated in IZs, most of which (around 1 million m 3 /day) is discharged directly and is untreated [21]. At present the collection, transportation, recycling, or reuse of the increasing amounts of solid waste from industrial zones is insufficient, with hazardous waste accounting for around 20% of the total [22].
Although there are many polices encouraging sustainable industry development [23][24][25], the challenges facing IZs in Viet Nam are manifold. A large number of industrial enterprises do not consider energy efficiency a priority because of a lack of awareness of the potential savings and of the available technologies. They tend to carry out minimal or low-cost energy efficiency measures, while focusing on the capacity expansion to modernize their operations and improve competitiveness and profitability. There is a lack of knowledge among company managers, local engineering personnel, and local technology suppliers with regard to the available clean and low-carbon technologies, appropriate practices within the operation, and process optimization strategies. In addition, there is a lack of awareness of alternative financial sources for investments in environmentally friendly technologies, for instance from the Swiss Green Credit Trust Fund or the Viet Nam Environment Protection Fund. Overall, there is a low level of enforcement of environmental legislation as a result of bottlenecks in personnel and supporting resources (e.g., monitoring equipment), while the level of responsibility among authorities and expertise from IZ management boards is unclear. There is also a lack of framework conditions and guidelines for the transformation of IZ into eco-industrial parks.
At present, the policy framework for the transition to the EIP model in Viet Nam is both insufficient and inconsistent. There are many agencies in charge of state management for IPs and there is a lack of effective inter-agency coordination. At the same time, the decentralization mechanisms are unclear, meaning that IZ management boards in each locality operate according to different models, with different functions, tasks, and powers. There are a number of social policies for employees in IZs, however these are not focused and, in practice, not very effective. In addition, insufficient attention has been paid to date for the creation of connections between IZs and the local community [26].
One key challenge from a policy perspective is that the current regulatory framework in Viet Nam does not encourage reusing wastewater and industrial by-products between companies. No detailed guidance is currently available on how to obtain government approval for their reuse, resulting in lengthy processes and random results. This is expected to change with Decree 82/2018/ND-CP 'Management of Industrial Parks and Economic Zones', which was approved in May 2018 and which prescribes the planning, establishment and operation of, policies on, and state management of, industrial parks and economic zones.

Drivers for Eco-Industrial Parks in Viet Nam
While challenges exist, there are substantial drivers for the transformation of traditional industrial zones into EIPs. Key drivers include reducing an industrial park's environmental footprint and associated costs; promoting efficiency gains and resulting economic savings; enabling community cohesion; providing better access to finance and technical support; and enhancing business competitiveness. In short, EIPs are about creating better and smarter designed industrial parks with are more competitive and more resilient to economic, environmental, and social risks.
Increased business competitiveness is one of the most significant drivers for the development of EIPs optimizing resource consumption in companies with the result of reducing energy, water, and material consumption in order to reduce cost and increase competitiveness. Besides, industries that operate in well-designed and well-managed parks can take advantage of resource efficiencies, reductions in waste disposal, value-addition and risk-mitigation, as well as of other available services, leading to cost savings. The indirect benefits of EIPs can be more difficult to quantify but are crucial to the long-term economic sustainability of the park. These include indirect employment creation through skills upgrading and training, technology transfer, improved reputation, and increased incidence of the "demonstration effect" arising from the application of best practice, leading to wider uptake of more efficient practices, especially in attracting foreign direct investments.
The environmental benefits of EIPs include reduced levels of pollution and GHG emission savings because of more efficient use of resources (raw materials, water, energy) and the reduction, reuse, and recycling of wastes, which can contribute to the preservation and protection of local biodiversity. Additionally, improved management of chemical and hazardous substances in EIPs can lead to additional environmental benefits and greater worker safety.
The social benefits deriving from EIP activities can catalyze the creation of quality local jobs through better working conditions. EIPs also work to enhance local community well-being through better community outreach, with some EIPs working toward increased rates of gender equality, through for instance the creation of employment for women and dedicated facilities for female workers. Better security features help to mitigate crime, creating a greater sense of security for workers. EIPs often support surrounding communities, through the creation of a social infrastructure such as vocational training centers, offering skills development training, as well as the provision of broader community services.
Government agencies have created IZs to facilitate the establishment of new industries with the provision of infrastructure such as utility, water and effluent treatment. As of 2018, a total of 328 IZs, out of which 230 in operation, were located in 56 Vietnamese provinces. The economic value of IZs for Viet Nam is substantial, with total turnover exceeding USD 165 billion, increasing by around 15% year-on-year. The total export sales stood at close to USD 119 billion, comprising 55% of the total export figure for Viet Nam. As of the end of 2017, the total employment in industrial parks nationwide was 3.12 million [22,27]. The rapid historical development of the number and size of industrial parks in Viet Nam is presented in Figure 1. It is the Government's viewpoint that IZs should develop sustainably with serious attention to environment and social issues. The development of IZs should contribute to the successful implementation of the Socio-Economic Development Strategy of 2015-2020 and the Green Growth Strategy. Cleaner production and EIPs are the two important and recognized tools for providing solutions toward sustainable production in Viet Nam [29].

Materials and Methods
The approach applied by the Project is presented in Figure 2, which involved several stakeholders including the MPI, provincial authorities, park management, tenant companies, and other ministries and national agencies, covering both bottom-up (e.g., EIP pilot projects, capacity building for IZ, and tenant companies) and top-down approaches (e.g., development of policy and guidelines, capacity building for government agencies).
The following sections of this paper outline the Project's interventions, key results, and lessons learned. Detailed information about the Project's approaches and methodologies is available from: https://eipvn.org/ and [22]. Following the methodology presented in Figure 2 above, the Project's interventions can be grouped in three main categories:

•
Policy development: UNIDO and the World Bank Group have been supporting the MPI in developing technical EIP guidelines (launched in July 2018) with the approved Decree 82, including support to operationalize the Decree, e.g., through International Expert Group meetings [26,[30][31][32].
Other policy interventions undertaken as part of the Project cover a review of existing legislative and institutional frameworks of industrial parks toward the development of EIPs [8], the formulation of standards requirements, and a roadmap for developing eco-industrial parks [26,31,33], and EIP related topic trainings and awareness raising workshops.

•
Company interventions: Resource Efficient and Cleaner Production (RECP) entails the continuous improvement of processes, products, and services in order to increase efficiency and reduce risks to humans and the environment. RECP addresses the three sustainability dimensions in a synergistic manner: (a) Heightened economic performance through improved productive use of resources; (b) environmental protection through conservation of resources and minimization the industry's impact on the natural environment; and (c) social enhancement by providing jobs and protecting the well-being of workers and local communities [34,35]. As part of the Project, RECP assessments were undertaken with companies located in the pilot industrial parks. These assessments covered staff trainings, site visits to assess the production process, identification of opportunities, (pre)feasibility studies, and implementation of feasible options. • Park level interventions: A key focus of the park level interventions of the Project was to identify and support the implementation of industrial symbioses in the pilot industrial parks participating in the Project (e.g., Khánh Phú IZ, Hòa Khánh IZ, and Trà Nóc 1&2 IZ). Industrial symbiosis engages traditionally separate industries in a collective approach to competitive advantage involving physical exchange of materials, energy, water, and/or by-products [36]. Industrial symbiosis often deals with the use of a previously disposed waste (as solid, liquid, gas) from one facility by another facility to provide a valuable by-product.

Results-Policy Development
As a regulator, MPI is the ministry responsible for overseeing the development of EIPs in Viet Nam. In the past, there have been no formal policies, regulations, or guidelines for the development of EIPs in the country. To bridge this gap, the Government of Viet Nam issued Decree No.82/2018/ND-CP ("Decree 82"), dated 22 May 2018 [14], to regulate the management of IZs and economic zones. The Decree is applied to regulatory bodies, organizations, and individuals involved in investment and business activities in industrial parks and economic zones. It prescribes the minimum requirements, incentives, and institutional framework for EIPs in Viet Nam, as well as a framework for EIPs focusing on the potential conversion of existing industrial parks into EIPs.
The Project supported the national policy dialogues and contributed to the drafting of the above mentioned Decree 82, which was finalized by MPI in collaboration with other ministries (e.g., MONRE, MOST, MOF).
The national technical EIP guidelines [32,37] developed provide a mechanism to operationalize the development of EIPs in Viet Nam and its institutional framework in more than 300 IZs across the country with a focus on the environment. The guidelines detail the process to be recognized as an EIP, as well as the roles and responsibilities of different stakeholders in enabling the transformation of existing industrial parks into EIPs. The MPI, UNIDO, and the World Bank Group engaged a number of stakeholder groups to assist the Government in developing and pilot-testing the national EIP guidelines, similar in effect to a national framework [32,38]. Regulators and governmental institutions, industrial park managers, and participating enterprises were all integrated into the stakeholder engagement process. The International EIP Framework [11] was a fundamental factor in facilitating the alignment of the main international organizations working on EIP development, as was the national framework on EIPs in Viet Nam (see Figure 3).
Subsequently, UNIDO has been supporting MPI with the development of economic and social indicators [31] that complement the environmental indicators developed with the support of the IFC. This set of indicators, in line with the International EIP Framework, has been developed through a national consultation process and the indicators chosen according to their relevance, practicality, and scientific basis.
A handbook on prevention, preparedness, and response to environmental accidents from IZs [39] and a compilation of relevant policy documents to support communities living close to IPs [40] was produced by the Project to support the development of a National EIP Framework.
The main objective of the National EIP Framework (Figure 3) is the potential conversion of existing industrial zones into EIPs. It was developed as a means to assist the implementation of EIPs in practice, and to supplement the new legal framework on industrial parks and economic zones, which plans to introduce the new types of economic zones, including EIPs. The EIP framework provides an overview of the requirements, roles, and responsibilities of the different stakeholders, primarily, regulators and government institutions, industrial park developers, and participating enterprises in establishing EIPs and further contributing to their development. The EIP framework in Viet Nam includes a number of stakeholders. The industrial park developers and the tenants participating in the EIP programme (participating enterprises) are the main beneficiaries.

Results-Company Interventions
The Project worked with 73 companies located in the five pilot industrial parks to adopt RECP practices and technologies. Each company underwent an eight-month RECP assessment cycle, in which the company worked with experts to identify wasteful issues in their production process and to propose customized RECP options to tackle inefficiencies. These included opportunities to optimize inputs of raw materials, energy and water, as well as chemical safety and waste management. An RECP monitoring cycle was also conducted for the beneficiary companies, in order to verify the implementation of the RECO options. Along with in-company RECP assessments, the Project's company-level interventions involved capacity-building activities aiming to enhance the RECP implementation capability of company staff and national experts [41].
The benefits from the RECP assessments undertaken with companies in the five industrial parks are summarized in Table 1 and Figure 4. Initially more than one thousand RECP options were found, and these were consolidated in 680 concrete and practical RECP options by the Project, of which 546 were already implemented in 57 companies. The RECP options implemented to date delivered substantial savings, including reductions in the use of electricity (19,274 MWh per year) and fossil fuels (142 TJ per year), reduction in greenhouse gas emissions (30,570 tCO 2 -eq per year), water (606,816 m 3 per year), and savings in the use of materials/chemicals (3121 t per year). The RECP options resulted in financial savings of EUR 2.9 million per year with an average payback time of 7 to 8 months. Almost EUR 10 million were mobilized by the Project from the recipient companies alone. These savings are the direct result from the Project's interventions and these do not include replication impacts. Materials saving options were implemented to help companies recycle and reuse by-products as materials in the production process, contributing to a reduction in the materials to be discharged into the environment. In addition, the process modification also helped to optimize the used materials. RECP options on chemicals mainly referred to process and technology modification to reduce the quantity of chemicals released into the environment and to improve product quality. by-products as materials in the production process, contributing to a reduction in the materials to be 283 discharged into the environment. In addition, the process modification also helped to optimize the 284 used materials. RECP options on chemicals mainly referred to process and technology modification 285 to reduce the quantity of chemicals released into the environment and to improve product quality.

298
The Project worked with these companies toward the establishment of an RECP team, i.e., a team 299 of employees responsible for suggesting and implementing RECP options. Such teams have proved 300 highly successful and will contribute to mainstreaming a "resource efficiency culture" across the  Illustrative Examples of Results Tables 2 and 3 highlight illustrative examples of RECP options identified and implemented by two companies with the support of the Project. In these companies, more basic good housekeeping interventions were coupled with technology and equipment investments. The pay-back time of the investments is therefore higher than the average, though the environmental and economic benefits are significant in absolute numbers.
The Project worked with these companies toward the establishment of an RECP team, i.e., a team of employees responsible for suggesting and implementing RECP options. Such teams have proved highly successful and will contribute to mainstreaming a "resource efficiency culture" across the company departments, ensuring that the options implemented are well managed and potentially replicated or scaled up in the future. Table 2. RECP assessments with companies-company case study 1.

Industry Sector/Product
Paper Factory

Production process
The paper factory produces kraft, industrial roll, and carton package with the capacity of 15,000 tons/year. The company has joined Project since January 2016 and has established a RECP team with nine members. The paper production process involves the following steps: No. Implemented RECP options Benefits 1 Issue regulation for cleaning and maintenance of electrical cabinets and motors Engine runs more durable; and reduced power consumption 2 Install electricity meter for every production line to control separately the electricity consumption benchmark for production lines Monitoring norms used to detect leaks and losses. 3 Repair roof to increase natural light and ventilation to save electricity Reduced power consumption 4 Invest the solar battery system Increase of renewable energy use and reduced power consumption 5 Control and regulate water consumption for washing conveyor Reduced water consumption 6 Increase treatment efficiency of WWT system to raise recycling water rate Reduced pollutants in waste water 7 Investment in four new high-pressure sprayers (two big machines and two small machines) for washing conveyor Reduced water consumption 8 Build roof for material storing area or press material for better maintenance and control consumption benchmark Reduced materials consumption 9 Remind worker to collect pulp on floor and clean floor at the end of working shift Reduced materials consumption 10 Regular monitoring of the quality of the pulp, especially the concentration of pulp (homogeneity of pulp) before making paper.
Increasing quality of paper, reduced materials consumption 11 Insulate steam distribution pipeline of lines 4 and 2 Reduced fuel consumption 12 Insulate condensate recovering pipeline and a number of steam containing tanks of lines 1,2,4, 6 Reduced fuel consumption 13 Insulate condensate recovering tanks Reduced fuel consumption 14 Invest supply water treatment system for boiler Extended boiler life 15 Training to improve skill and responsibility of boiler operation workers Reduced fuel consumption 16 Use good quality wood (with humidity less than 40%, wood dried to meet less than 35% humidity before using Improved quality and reduced operating cost 17 Remove scale and blowdown regularly Improved quality and reduced operating cost 18 Replace three existing blowers by one of 7.5 HP for supplying wind into boiler Reduced electricity consumption 19 Adjust frequency of smoke fan based on suction pressure to ensure balance between fire and wind Reduced electricity consumption 20 Install meter to measure steam consumption for each line Reduced electricity consumption 21 Increase water removing capacity by investing in long net paper making machine Reduced water consumption 22 Invest in fluidized boiler system, capacity of 8 tons/h with three stages steam system. Reduced fuel consumption and operating cost  Heat up fuel (coal) to optimal temperature before being sprayed into burning chamber Reduced fuel consumption 7 Have a plan for furnace maintenance to repair partially broken area Reduced fuel consumption 8 To change to more efficient heater for melting tin tank Reduced electricity consumption 9 Maintain and replace by the new furnace Reduced electricity consumption 10 Should be equipped with a roof to protect materials and control their consumption Reduced materials consumption 11 Take advantage of heat in the emission to dry fuel Reduced fuel consumption

Results-Park Level Interventions
The Project's activities entailed the identification of industrial symbiosis opportunities through the analysis of the inputs/outputs of the companies, bilateral discussions with park management, and companies, opportunity identification workshops, and a review of international experiences. Together with the park management and the tenant companies, the project team prioritized the identified industrial symbiosis opportunities qualitatively based on their likely achievability, anticipated benefits (economic, environmental, and social), and the interest from relevant stakeholders (e.g., park management, relevant companies). The team conducted feasibility studies for prioritized opportunities. These covered technical feasibility (e.g., technology options, required capacities), assessment of environmental and social benefits, economic feasibility (e.g., CAPEX, OPEX, return on investment), and a review of possible implementation options. The results of the feasibility studies were presented and discussed with the park management and relevant companies, and customized support was provided by the project team to assist in their implementation.
Training was provided and workshops were organized for more than 130 participants in the industrial parks targeted by the Project to present and discuss the results of the feasibility analyses. This was also an opportunity used to build synergistic connection between the respective stakeholders of each IS opportunity and understand better the bottlenecks, and technological requirements and expertise needs to implement them. Further capacity building was provided to help with the implementation.
In addition to the industrial symbiosis activities, the Project entailed other park level interventions, including (a) assessments of the central wastewater treatment plants in the pilot parks in order to support their performance improvement; (b) development of park management assessment tool and strategy to better engage the park management; (c) compilation of good practice examples of centralized services existing in 15 industrial parks and review of shared park level services that need to be strengthened in Viet Nam; and (d) development of a solid waste inventory to identify and assess opportunities of waste recycling and reuse. Table 4 summarizes the results of the Project on the identification and development of industrial symbiosis opportunities in the pilot parks (Khanh Phu IZ, Hoa Khanh IZ, and Tra Noc 1&2 IZ).
By the end of the Project, for a total of 18 opportunities and corresponding feasibility studies, two opportunities are already implemented, five are under implementation, and five opportunities are planned. This means two-thirds of the opportunities detected have been adopted by stakeholders who are committed to their implementation. If all opportunities are implemented, 70.5 KtCO2/year, 885,333 m 3 of freshwater, and 84,444 t of waste are expected to be saved every year. The payback time for these opportunities is expected to range between 3 months and 8 years.

Illustrative Examples of Results
A map with industrial symbiosis opportunities selected for feasibility studies in Tra Noc 1&2 IZ is presented in Figure 5. Similar maps have been produced for the two other parks. The figure shows that a diverse set of opportunities are being considered for further development and implementation involving different company types as well as the management board of the park. The opportunities cover exchanges of wastes and by-products (e.g., biomass, waste steel, waste paper/cardboard), energy (e.g., shared biomass boiler to produce steam for multiple tenant companies), water (e.g., water storage tank at the centralized wastewater treatment plant to facilitate the reuse of industrial wastewater among companies), and shared services (e.g., coordination of joint company activities in the park by the IZ management board, collection and transport of wastes, training). Industrial symbiosis can interlink traditionally separate companies in a collective approach to create competitive advantages involving physical exchange of materials, energy, water, and/or by-products, as per the definition of Chertow [36].    [42].

IS Opportunity
Biogas Recovery at One Company for Use As Fuel in the Boiler of an Adjacent Company.

Key challenges
• Biogas production needs to meet the minimum amount required for the boiler to operate.

•
Connecting with the existing system, having an automated control system, and all the additional equipment needs to meet the standard of the boiler.

Solutions
• The biogas supplier should engage with the partner company to ensure the stability of the biogas produced. Status of implementation Implemented.

Environmental savings
• Reduction in biomass consumption by~33%. • A rebate of 50% of land use fees, land renting, and could be paid in instalments with a maximum timeframe of five years; • Support of 50% building investment capital-including 40% from the state budget, 10% from the local budget; • Support of 50% of the transportation cost of the waste from the emission source to the treatment facility and 50% of the electricity cost for direct production; • Depreciation of fixed assets: depreciated two times faster than the current regulation. Table 6. Development of industrial symbiosis opportunities-case study 2 [42].

IS Opportunity. Mutualization of the Use of Boilers between Three Companies.
Key challenges

•
The quality of the steam has to meet the technical standard.

•
The steam demand and capacity is dependent on production, and that implies that it fluctuates.

•
The changing nature of production demand implies change in steam requirements of the companies implementing the symbiosis.

•
Manpower for operation and maintenance of the system.

Solutions
• Negotiate commitments between an ESCO and the companies that have a demand.

•
The ESCO company has to take charge of maintenance costs for the redundant boiler.

•
Ensure that the capacity of the boiler is sufficient to cater to the requirements when the steam demand increases for any of the companies.

Stakeholders involved
Management of the three companies involved.

Status of implementation Under implementation.
Environmental savings Payback time 3 years.

Financing options
Bank loan (60% of the total amount). As mentioned in Decree 82, the company could apply for a loan from the Vietnam Development Bank. The specific bank will be selected by the company.

Summary of Project Results
The results of the Project's interventions in the pilot industrial parks can be summarized as follows [41]: The ratio of RECP options identification and their implementation is around 80%, which is considered to be high. RECP options related to electricity savings account for the highest proportion (over 50%) of total options identified and implemented in the parks in all three provinces.

•
The process of implementing RECP options helped companies achieve substantial benefits in terms of efficient use of resources (electricity, water, fuel, raw materials, chemicals), gaining economic benefits and reducing emissions to the environment as well as improving working conditions for workers. The RECP options implemented range from simple good housekeeping to more complex technology modifications, covering a range of industry sectors. They demonstrated value in improving the economic and environmental performance of companies in Viet Nam, in particular resource intensive industries such as food, cement, textiles, mechanical processing, and fertilizer production.

Discussion and Conclusions
The application of the policy, company and park level interventions as part of the Project "Implementation of eco-industrial park initiative for sustainable industrial zones in Viet Nam" demonstrated their value in contributing to the development and implementation of EIP practices in the country. Rather than stand-alone solutions, multi-disciplinary EIP concepts are most effective if applied as part of the integrated top-down approach (policy support as entry point for interventions) combined with a bottom-up approach (industrial park as entry point).
On policy development, a continuous and integrated effort over the four years of the Project to create awareness and build capacity on the EIP concept and its environmental, economic, and social benefits at all levels (e.g., policy maker, provincial authorities, tenant companies) was critical to the success of the policy interventions and successfully engaging all project stakeholders. A committed group of policy-makers with clear guidance from the highest political level was essential in ensuring buy-in from different ministries and for gaining clarity regarding the process to be followed in implementing the Decree and circulars, thereby setting the stage for future EIP development in the country. In the near future, the resulting complete set of environmental, economic, and social indicators will be considered by the Government of Viet Nam as a consolidated guideline to be adopted for the implementation of Decree 82. The national process toward the definition of clear policy and regulations for EIPs has been set by Decree 82, which provides a strong legal baseline for the implementation. The implementation offers a number of opportunities, but also faces constraints in Vietnamese legislation as concrete opportunities to develop industrial symbiosis are still limited by regulation. Scaling up EIPs will involve seeking inputs from different stakeholders, including the private sector, and will require the coordinated efforts of different ministries. To support the implementation of Decree 82, it is envisaged that ministerial circulars will be developed for both industries and government authorities to regulate the detailed technical aspects and thereby streamline the implementation and approval processes (e.g., for reuse of industrial effluent and by-products in a safe and sustainable manner).
On company interventions, a large proportion (45%) of the total RECP options identified through the Project were examples of good housekeeping with low investment costs and were easy for the companies to implement. Some of the participating companies only implemented the simple RECP options with low investment costs, as these could often be easily added to the maintenance plan of the company. More complex technology options require higher company investments and, as a result, approval from the company's management board.
All companies implemented options for electricity saving as these were easier to implement. A large proportion of the water savings options were examples of good housekeeping, as well as process control to improve effectively the awareness of water use. Options for fuel savings were often a process modification to optimize the process of fuel use in terms of both planning and technology.
On park level interventions, it was clear that untapped opportunities exist for industrial symbiosis for energy, water, and material efficiency gains in industrial parks. The implementation of industrial symbiosis offers a lot of business opportunities which generate economic, environmental, and social benefits to the industrial park overall, park management, tenant companies, and local community. This is evidenced by the Project being able to identify over 61 industrial symbiosis opportunities for parks, for which a total of 18 feasibility studies have been undertaken. Industrial symbiosis also faces challenges in the Vietnamese legislation. For example, it is still cumbersome for an industrial park manager to obtain government approval to install renewable energy facilities in the park area or to be able to provide water services from treated wastewater to tenant companies [43]. There is currently no detailed guidance on how to obtain the approval from the government for reusing wastewater. It is a long process to obtain government approval for water reuse, because detailed data is required by the government on the water quality and intended reuse. Companies must discharge their effluent to a centralized wastewater treatment facility or other treatment unit (Article 9, circular 35/2015TT-BTNMT). Therefore, companies are not allowed to transfer their wastewater to another company which does not have a wastewater treatment function registered in its business license. Industrial water reuse is very sensitive, because authorities are concerned that companies will take advantages of the approval to discharge unqualified treated wastewater into the environment.
Efforts are underway to address these challenges. The Government of Viet Nam is pushing for the country to transition into a circular economy and various initiatives are under development and being implemented to facilitate this transition. The recently approved Decree 82/2018/ND-CP "Management of Industrial Parks and Economic Zones" prescribes the planning, establishment, and operation of policies on, and state management of, industrial parks and economic zones. The Decree explicitly mentions instructions for the implementation of EIPs. Value recovery and reuse of industrial by-products, energy, and water are key elements of the EIP concept. As part of Decree 82 it is compulsory for an industrial park to have at least one industrial symbiosis implemented in order to be recognized as an eco-industrial park. The Decree 82 aims to further remove regulatory barriers that could hamper EIP development, including the reuse of industrial water and industrial by-products/waste. To support the implementation of Decree 82, it is envisaged that ministerial circulars on industrial water reuse will be developed. These circulars will serve as national technical guidelines for both industries and government authorities to streamline the approval processes for the reuse of industrial water and by-products in a safe and sustainable manner.

Lessons Learned and Next Steps
Some insights and lessons learned from the work on policy development as well as company and park level EIP interventions are that:

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Although the new decree 82/2018/NÐ-CP increases the transparency of EIP development in the country, legal barriers to implement EIPs in reality still exist, and these mainly relates to lack of available and reliable data, guidelines on waste and wastewater reuse, and recycling and minimum standards to reuse it [30]. • Initial awareness raising and creating early successes in the Project is essential. Convincing companies that it is for their own benefit can take a lot of time and effort. Once the early adopters have results, then all the neighboring companies wish to join and benefit from the Project.

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Overall, there is often a lack of available data at company, park, provincial, and national level. Data on the quantities and qualities of resources (e.g., raw materials, wastes, and by-products, energy, and water) is needed before being able to assess the potential for industrial symbiosis in an industrial park. Collecting these basic data can be a time-consuming process. Therefore, strengthening resource monitoring at all levels should be a priority.

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Commitment of the company management board is the key factor to the success of the company level interventions. At companies with high commitment, many RECP options are implemented immediately with specific benefits, encouraging enterprises to implement and maintain options till the end of the RECP programme.

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The company teams established play an important role in implementing and maintaining the effectiveness of the RECP and industrial symbiosis options identified. The teams need to be supported by the management board of the companies as well as IZ management, and maintained after the actual assessments have been completed in order to ensure that feasible options are implemented effectively.

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Technical assistance provided to companies demonstrated that RECP options can be low-or no cost and easy to implement with high returns on companies' investments. Simple and no investment cost options should be implemented immediately. In addition to the immediate environmental and financial savings, this will also motivate and create confidence for the company to deploy RECP options with higher investment costs.

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For technology upgrades and investments, it is necessary to inform companies on available green financial funds and preferential loans to implement the RECP and industrial symbiosis options and provide support on how to access these funds. This was one of the key drivers for the Project to prepare a customized handbook on accessing green financing in Viet Nam [44].
The development of industrial symbiosis in industrial parks in Viet Nam is subject to similar success factors which apply internationally (e.g., [10,45,46]), including:

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Feasible distances: This is generally a key success factor as transportation can make up a significant proportion of the costs to enable an industrial synergy. A clear distinction must be made between synergies inside and outside an industrial park (e.g., material exported for road construction).
Obviously, this latter case is more sensitive to transportation issues. • Viable technology and equipment: Modification and investment in technologies are often required to implement industrial symbiosis. For instance, a by-product may need to be processed to meet the technical and market requirements. Without a suitable and proven technology available to treat, convert or transport a by-product, a synergy project would be not feasible. Recognize full set of benefits: The benefits of industrial symbiosis often go beyond return on-investment, as the benefits can also cover risk mitigation, improved productivity, and improved environmental and social performance. Investment decisions must therefore account for the full set of economic, environmental, and social benefits.

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Return on investment: The implementation of industrial symbiosis needs a favorable return on investment and so-called low-hanging fruit for the beneficiaries, as often the decision on their investment is competing with investments in other areas. • Access to finance: Investments can sometimes be significant to implement industrial synergies. This is particularly the case for utility synergies and shared infrastructures in industrial parks. Financial incentives can help decreasing the payback period. As industrial symbiosis often require an investment, the availability of financing solutions is clearly a key factor for successful implementation [16].
Although EIP concepts have been disseminated across the three provinces of the projects and technical support provided, industrial parks are widespread in Viet Nam, so continued efforts are required to disseminate and further replicate the approaches and outcomes of the Project to all industrial parks.
To overcome the above mentioned legal barriers to implement EIPs, circulars on how to implement are of outmost importance for the practical and wider EIP implementation in Viet Nam. This includes the formal adoption of minimum EIP requirements for social, economic, and environmental aspects and the need to provide implementation guidelines to companies, EIP managers, local authorities, and agencies [30].
MPI has been tasked to act as the focal point to draft the relevant circulars for the implementation of the decree. Collaboration between ministries is necessary for the future of the development and approval of these circulars.
The work undertaken as part of the Project (2014-2019) will continue through the country level interventions as part of the Global EIP Programme, funded by the Swiss Government through State Secretariat for Economic Affairs of Switzerland (SECO). Viet Nam is one of the countries participating in this programme, together with Colombia, Egypt, Peru and Ukraine. The country level interventions of the new programme will focus on mainstreaming EIP in policies and regulations and implementing EIP approaches in pilot industrial parks.