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Special Issue "The 6th International Conference on Sustainable Solid Waste Management: NAXOS 2018"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Sustainable Energy".

Deadline for manuscript submissions: closed (28 February 2019)

Special Issue Editors

Guest Editor
Dr. Mejdi Jeguirim

Institut de Sciences des Matériaux de Mulhouse, 3 rue Alfred Werner, 68093 Mulhouse Cedex, France
Website | E-Mail
Interests: pyrolysis; gasification and combustion of different biomasses, including agriculture residues and agro-industrial byproducts; gaseous and aqueous effluent treatments
Guest Editor
Prof. Lionel Limousy

Institut de Sciences des Matériaux de Mulhouse, 3, rue Alfred Werner, 68093 Mulhouse Cedex, France
Website | E-Mail
Interests: biomass resources identification and characterization; biofuels formulation and production; thermochemical conversion; bioproducts characterization; reactivity tests
Guest Editor
Dr. Konstantinos Moustakas

Unit of Environmental Science and Technology, School of Chemical Engineering, National Technical University of Athens, Greece
Website | E-Mail
Interests: environmental protection; solid waste management and treatment technologies with emphasis on thermal ones

Special Issue Information

Dear Colleagues,

The conference aims to address the significant issue of sustainable solid waste management through the promotion of safe practices and effective technologies. The conference focuses mainly on modern solid waste technologies. It aims to stimulate the interest of scientists and citizens and inform them about the latest developments in the field of municipal solid waste management. Separation at source, biological treatment, the treatment at central facilities, waste prevention, biowaste utilization, recycling promotion, sludge management, agricultural and livestock waste, management of specific waste streams (construction and demolition waste, waste from electrical and electronic equipment, etc.) constitute main conference subjects. Special attention will be drawn to the valorization prospects and the products from solid waste, such as biofuels, compost, materials, etc. The new concept of this conference is that it hopes to strengthen the link of the applied research with industry. Emphasis will be placed on waste management issues in islands and generally isolated areas. Biotechnology, circular economy, best available techniques, symbiosis networks, energy consumption and saving, carbon footprint and water footprint, zero-waste initiatives, marine litter constitute new target areas of the conference. The conference will provide an opportunity to bring together scientists and professionals from government departments, industries, Municipalities, private institutions, research and education institutions, being a forum for the exchange of the most recent ideas, techniques and experiences in all areas of solid waste management. A special workshop will also focus on the industrial operation and the support to the industries in order to improve their performance with parallel environmental and financial benefits.

Prof. Mejdi Jeguirim
Prof. Lionel Limousy
Dr. Konstantinos Moustakas
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (5 papers)

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Research

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Open AccessFeature PaperArticle The Application of Analytical Hierarchy Process in Combination with PESTEL-SWOT Analysis to Assess the Hydrocarbons Sector in Cyprus
Energies 2019, 12(5), 791; https://doi.org/10.3390/en12050791
Received: 4 February 2019 / Revised: 21 February 2019 / Accepted: 22 February 2019 / Published: 27 February 2019
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Abstract
Natural gas reserves have been recently found offshore of Cyprus. Hence, a new energy sector is under development, creating potential for raised welfare for the small insular EU member. Several social and economic benefits could be achieved from the resources’ exploitation. However, natural [...] Read more.
Natural gas reserves have been recently found offshore of Cyprus. Hence, a new energy sector is under development, creating potential for raised welfare for the small insular EU member. Several social and economic benefits could be achieved from the resources’ exploitation. However, natural gas is a non-renewable energy source, connected with the major environmental issues of fossil fuels. The research goal of this work was to evaluate the sustainability of the new hydrocarbons sector. This was attained using a set of indicators, developed from the combination of PESTEL (Political, Economic, Technical, Social, Environmental, Legal) and SWOT (Strengths, Weaknesses, Opportunities, Threats) analyses. These were quantified using the Analytical Hierarchy Process (AHP) weighting method. They were pairwise compared and evaluated, resulting to a size for each one. The judgements of four evaluators, representing diverse interested parties, were used. The strengths and opportunities of the sector were found to be more than the weaknesses and threats. The relevant indicators quantification demonstrates also that the value of the positives is higher than the negatives. Therefore, if the first are enhanced and the latter are mitigated, there is sustainability potential. The sectors environmental issues are evaluated as the most important, followed by the economic. The other takes lower but comparatively significant values, and must be handled accordingly. These results lead to useful conclusions and could be exploited for decision-making and policies formulation. Full article
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Open AccessArticle Novel Yeast Strains for the Efficient Saccharification and Fermentation of Starchy By-Products to Bioethanol
Energies 2019, 12(4), 714; https://doi.org/10.3390/en12040714
Received: 16 January 2019 / Revised: 16 February 2019 / Accepted: 19 February 2019 / Published: 22 February 2019
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Abstract
The use of solid starchy waste streams to produce value-added products, such as fuel ethanol, is a priority for the global bio-based economy. Despite technological advances, bioethanol production from starch is still not economically competitive. Large cost-savings can be achieved through process integration [...] Read more.
The use of solid starchy waste streams to produce value-added products, such as fuel ethanol, is a priority for the global bio-based economy. Despite technological advances, bioethanol production from starch is still not economically competitive. Large cost-savings can be achieved through process integration (consolidated bioprocessing, CBP) and new amylolytic microbes that are able to directly convert starchy biomass into fuel in a single bioreactor. Firstly, CBP technology requires efficient fermenting yeast strains to be engineered for amylase(s) production. This study addressed the selection of superior yeast strains with high fermentative performances to be used as recipient for future CBP engineering of fungal amylases. Twenty-one newly isolated wild-type Saccharomyces cerevisiae strains were screened at 30 °C in a simultaneous saccharification and fermentation (SSF) set up using starchy substrates at high loading (20% w/v) and the commercial amylases cocktail STARGEN™ 002. The industrial yeast Ethanol Red™ was used as benchmark. A cluster of strains produced ethanol levels (up to 118 g/L) significantly higher than those of Ethanol Red™ (about 109 g/L). In particular, S. cerevisiae L20, selected for a scale-up process into a 1-L bioreactor, confirmed the outstanding performance over the industrial benchmark, producing nearly 101 g/L ethanol instead of 94 g/L. As a result, this strain can be a promising CBP host for heterologous expression of fungal amylases towards the design of novel and efficient starch-to-ethanol routes. Full article
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Open AccessArticle Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses
Energies 2019, 12(3), 501; https://doi.org/10.3390/en12030501
Received: 19 December 2018 / Revised: 30 January 2019 / Accepted: 31 January 2019 / Published: 5 February 2019
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Abstract
The aim of this paper is to improve the operating share of a biomass cogeneration unit by using unavoidable heat waste heat recovered from a district network heating used for drying woody biomass’ return water (law-grade temperature heat). The optimal operating conditions of [...] Read more.
The aim of this paper is to improve the operating share of a biomass cogeneration unit by using unavoidable heat waste heat recovered from a district network heating used for drying woody biomass’ return water (law-grade temperature heat). The optimal operating conditions of a drying unit added to the system were estimated from an energy and a financial point of view, applying four objective functions (drying time, energy consumption, energy balance, and financial performance of the cogeneration unit). An experimental design methodology used heat for the implementation of these functions and to obtain an operating chart. Numerical modelling was performed to develop a simulation tool able to illustrate the unsteady operations able to take into account the available waste heat. Surprisingly, the model shows that the right strategy to increase the financial gain is to produce more warm water than necessary and to consequently dispose higher quantities of unavoidable heat in the network’s return water, which heat up the drying air at a higher temperature. This result contrasts with the current approaches of setting-up cogeneration units that are based on the minimization of the heat production. Full article
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Open AccessArticle Energy Efficiency of Biorefinery Schemes Using Sugarcane Bagasse as Raw Material
Energies 2018, 11(12), 3474; https://doi.org/10.3390/en11123474
Received: 6 November 2018 / Revised: 11 December 2018 / Accepted: 11 December 2018 / Published: 13 December 2018
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Abstract
The use of biomass to obtain value-added products has been a good alternative for reducing their environmental impacts. For this purpose, different studies have been carried out focused on the use of agro-industrial waste. One of the most commonly used raw materials has [...] Read more.
The use of biomass to obtain value-added products has been a good alternative for reducing their environmental impacts. For this purpose, different studies have been carried out focused on the use of agro-industrial waste. One of the most commonly used raw materials has been bagasse obtained from the processing of sugarcane in high quantities in countries like Brazil, India, China, Thailand, Pakistan, Mexico, Colombia, Indonesia, Philippines, and the United States. From 1 ton of sugarcane, 280 kg of bagasse can be obtained. Sugarcane bagasse (SCB) is a waste that is rich in polysaccharides, which makes it a promising raw material for obtaining products under biorefinery concept. The objective of this work was to analyze from the energetic point of view, different biorefinery schemes in which SCB is employed as a raw material. The design and simulation of the different biorefinery schemes is performed in Aspen Plus software. From this software, it was possible to obtain the different mass and energy balances, which are used in the technical and energetic analysis. Exergy is used as a comparison tool for the energy analysis. These analyses allowed for the selection of the best biorefinery configuration from SCB. Full article
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Review

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Open AccessReview A Review of Sludge-to-Energy Recovery Methods
Energies 2019, 12(1), 60; https://doi.org/10.3390/en12010060
Received: 17 November 2018 / Revised: 17 December 2018 / Accepted: 18 December 2018 / Published: 25 December 2018
Cited by 1 | PDF Full-text (4085 KB) | HTML Full-text | XML Full-text
Abstract
The increasing volume of sewage sludge from wastewater treatment facilities is becoming a prominent concern globally. The disposal of this sludge is particularly challenging and poses severe environmental hazards due to the high content of organic, toxic and heavy metal pollutants among its [...] Read more.
The increasing volume of sewage sludge from wastewater treatment facilities is becoming a prominent concern globally. The disposal of this sludge is particularly challenging and poses severe environmental hazards due to the high content of organic, toxic and heavy metal pollutants among its constituents. This study presents a simple review of four sewage to energy recovery routes (anaerobic digestion, combustion, pyrolysis and gasification) with emphasis on recent developments in research, as well as benefits and limitations of the technology for ensuring cost and environmentally viable sewage to energy pathway. This study focusses on the review of various commercially viable sludge conversion processes and technologies used for energy recovery from sewage sludge. This was done via in-depth process descriptions gathered from literatures and simplified schematic depiction of such energy recovery processes when utilised for sludge. Specifically, the impact of fuel properties and its effect on the recovery process were discussed to indicate the current challenges and recent scientific research undertaken to resolve these challenges and improve the operational, environmental and cost competitiveness of these technologies. Full article
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