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Special Issue "Waste Water Treatment and Energy Recovery: Opportunities and Challenges"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "B: Energy and Environment".

Deadline for manuscript submissions: 26 February 2023 | Viewed by 2504

Special Issue Editors

Prof. Dr. Sylwia Myszograj
E-Mail Website
Guest Editor
Institute of Environmental Engineering, University of Zielona Góra, 65-417 Zielona Góra, Poland
Interests: biological wastewater treatment; biochemical processes; anaerobic digestion; disintegration of sewage sludge; renewable energy; environmental analysis
Dr. Ewelina Płuciennik-Koropczuk
E-Mail Website
Guest Editor
Institute of Environmental Engineering, University of Zielona Góra, Poland
Interests: Wastewater engineering; Anaerobic digestion; Methane production; Renewable energy
Dr. Piotr Ziembicki
E-Mail Website
Guest Editor
Institute of Environmental Engineering, University of Zielona Góra, Poland
Interests: Hydraulic engineering; Energy simulation; Energy efficiency; Alternative energy; Renewable Energy Technologies

Special Issue Information

Dear Colleagues,

Energy efficiency in the water and wastewater industry has become increasingly important in recent years, as wastewater treatment plants are responsible for nearly 35% of the energy consumption of all municipal facilities. The optimal operation of wastewater treatment plants requires the provision of electricity, which is necessary for conducting technological processes and for transporting wastewater. The costs generated translate into the price of collecting and treating wastewater. Therefore, it is justified to optimize the wastewater treatment processes technically and economically by reducing the electricity consumption rates. However, the reduction of the energy intensity of these processes is possible only within certain limits. Therefore, it is necessary—apart from the rationalization of consumption—to look for other methods of obtaining energy. One of the ways of solving this problem and at the same time reducing the emission of harmful combustion products and slowing down the rate of consumption of fossil fuel resources is the use of "clean" energy generation technologies, in particular the so-called "renewable" energy sources. Wastewater and sewage sludge are good materials for anaerobic digestion processes, heat recovery and hydropower.

All researchers working in the field are invited to contribute original research papers or reviews to this Special Issue of Energies, which reports on the design and modelling of wastewater treatment processes and sewage sludge management connected to development of efficient and sustainable technologies for energy recovery. The scope of this Issue includes disintegration, anaerobic digestion, biogas, biohydrogen, bioenergy recovery from wastewater produced by hydrothermal processing biomass, circular economy, and energy recovery from wastewater and sewage sludge.

Prof. Dr. Sylwia Myszograj
Dr. Ewelina Płuciennik-Koropczuk
Dr. Piotr Ziembicki
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 submissions that pass pre-check are 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 2200 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.

Keywords

  • Wastewater treatment technologies
  • Sewage sludge management
  • Energy recovery
  • Biogas
  • Biohydrogen
  • Disintegration methods
  • Balance
  • Modelling
  • ADM1
  • Hydropower
  • Heat recovery
  • Energy assessment.

Published Papers (4 papers)

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Research

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Article
The Potential of Heat Recovery from Wastewater Considering the Protection of Wastewater Treatment Plant Technology
Energies 2023, 16(1), 227; https://doi.org/10.3390/en16010227 - 25 Dec 2022
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Abstract
Energy efficiency is extremely significant for industrial processes and technologies. Rising energy prices, depleting fossil fuels, as well as tightening regulations that impose the need to reduce GHG emissions incentivize companies to look for energy-efficient solutions. This also applies to wastewater treatment plants, [...] Read more.
Energy efficiency is extremely significant for industrial processes and technologies. Rising energy prices, depleting fossil fuels, as well as tightening regulations that impose the need to reduce GHG emissions incentivize companies to look for energy-efficient solutions. This also applies to wastewater treatment plants, which, on the one hand, are consumers of very large amounts of energy, and on the other hand, have significant potential to retrieve waste energy in the form of heat accumulated in wastewater. The authors of this publication have recognized the benefits of managing this heat. However, they have also pointed out several problems and difficulties associated with this process. By means of measured data, this publication provides a comprehensive analysis of the heat that can be recovered from wastewater treatment plants. As a result of the analyses, the locations of sites for collecting heat from wastewater have been determined, and potential technologies for this purpose have been identified. Moreover, the impact of the proposed heat recovery technology on the process of biological wastewater treatment has also been analyzed. As a result of the research, the authors developed generalized guidelines for selecting an optimal heat recovery site and the technological system designed for this purpose. Full article
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Article
Heat Recovery from a Wastewater Treatment Process—Case Study
Energies 2023, 16(1), 44; https://doi.org/10.3390/en16010044 - 21 Dec 2022
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Abstract
This article presents the potential of heat recovery from wastewater with an example of a wastewater treatment plant (WWTP) in Mokrawica, which is located in the West Pomeranian region of Poland. A thorough literature review discusses the relevance of the topic and shows [...] Read more.
This article presents the potential of heat recovery from wastewater with an example of a wastewater treatment plant (WWTP) in Mokrawica, which is located in the West Pomeranian region of Poland. A thorough literature review discusses the relevance of the topic and shows examples of heat recovery conducted with heat pumps. Raw and treated wastewater are mostly used as heat sources, with the latter achieving higher thermal capacities. Heat recovery from a biological treatment process is rarely implemented and requires more detailed studies on this subject. The proposed methodology for estimating possible heat recovered from wastewater, requiring heating and cooling capacities, as well as the coefficient of performance (COP) of a heat pump, is based on only three parameters: wastewater volumetric flow, wastewater temperature, and the required temperature for heating or air-conditioning. The heat recovery potential was determined for different parts of WWTP processes, i.e., the sand box, aeration chamber, secondary sedimentation tank, and treated sewage disposal. The average values of 309–451 kW and a minimum of 58–68 kW in winter were determined. The results also indicate that, depending on the location of the heat recovery, it is possible to obtain from wastewater between 57.9 kW and 93.8 kW of heat or transfer to wastewater from 185.9 to 228.2 kW. To improve biological treatment processes in the winter season, wastewater should be preheated with a minimum of 349–356 kW that can be recovered from the treated wastewater. The heat transferred to the wastewater from the air-conditioning system amounts to 138–141 kW. By comparing the required cooling and heating capacities with the available resources, it is possible to fully recover or transfer the heat for central heating, hot water, and air conditioning of the building. Partial preheating of wastewater during the treatment process requires further analysis. Full article
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Article
Reducing CO2 Emissions from Wastewater Treatment Plants by Utilising Renewable Energy Sources—Case Study
Energies 2022, 15(22), 8446; https://doi.org/10.3390/en15228446 - 11 Nov 2022
Viewed by 418
Abstract
The European Parliament’s climate and energy policy, which aims to cut greenhouse gas emissions by 2030 considerably, imposes on Member States the duty to develop National Action Plans (NAPs), which determine the percentage of renewable energy sources (RES) in gross energy consumption. Poland [...] Read more.
The European Parliament’s climate and energy policy, which aims to cut greenhouse gas emissions by 2030 considerably, imposes on Member States the duty to develop National Action Plans (NAPs), which determine the percentage of renewable energy sources (RES) in gross energy consumption. Poland assumed a percentage of renewable energy sources in gross energy consumption of 21–23% in the NREAP. In 2020, Poland’s utilisation of renewable energy sources was 16.2% (22nd among EU nations), which was lower than the European average. The municipal sector, particularly sewage treatment facilities, can undoubtedly contribute to an increase in renewable energy generation and utilisation. Wastewater and sewage sludge are excellent sources of heat and energy in the methane fermentation process, and the sewage treatment plant area is perfect for solar panel installation. The article is a case study that presents the possibility of decreasing CO2 emissions from wastewater treatment facilities by 45,000 PE due to using renewable energy sources such as photovoltaics and cogeneration. The average monthly CO2 emission reduced from 68,905 kg CO2/ month to 37,385 kg CO2/month with the adoption of renewable energy sources. Full article
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Review

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Review
Thermal Disintegration of Sewage Sludge as a Method of Improving the Biogas Potential
Energies 2023, 16(1), 559; https://doi.org/10.3390/en16010559 - 03 Jan 2023
Viewed by 450
Abstract
Operating and research experiments indicate that the potential benefits of thermal treatment of sewage sludge before methane fermentation include increasing the biodegradability of substrates, reducing the amount and improving the dewaterability of the fermentate and its hygienization, reducing the emission of odours during [...] Read more.
Operating and research experiments indicate that the potential benefits of thermal treatment of sewage sludge before methane fermentation include increasing the biodegradability of substrates, reducing the amount and improving the dewaterability of the fermentate and its hygienization, reducing the emission of odours during stabilization, higher production of biogas, and improving the energy balance of the process. The process of disintegration (liquefaction) can be carried out, for example, through the use of mechanical homogenization, microwaves and ultrasonic waves, chemical agents, thermal methods, and biological processes. The article reviews the literature data on thermal hydrolysis research, from the first source information to the present. The thermal hydrolysis achieved enhanced hydrolysis, biogas potential, and faster sludge degradation during anaerobic digestion without compromising the quality of the end products. Full article
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