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Anaerobic Digestion of Wastewater for Renewable Energy Production

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A4: Bio-Energy".

Deadline for manuscript submissions: closed (30 June 2024) | Viewed by 2747

Special Issue Editor


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Guest Editor
Faculty of Environmental Engineering, Lublin University of Technology, Nadbystrzycka 40B, 20-618 Lublin, Poland
Interests: anaerobic digestion process; energy efficiency at WWTP; hydrodynamic cavitation in environmental engineering; bioaugmentation in wastewater and sludge treatments

Special Issue Information

Dear Colleagues,

Progressive climate change and depletion of traditional fuels lead to the search for new solutions in the field of renewable energy production. The anaerobic digestion is recognized as one of the most promising technologies that indicate several environmental benefits, the most important ones include: reduction of greenhouse gas emissions, management of organic waste, thus reducing the need for landfill disposal, production of nutrient-rich digestate that might be used as a fertilizer. However, the most important is generation of high-quality renewable fuel, e.g., biogas. It is known as a versatile source of energy that finds several applications, such as production of electricity and heat, as vehicle fuel, and in several different types of industry.

However, despite numerous studies in the field of AD, there is still a need to improve the process performance, and hence increase biogas production. The main aim of this Special Issue of the journal Energies is to publish original papers, as well as extensive reviews related to recent and novel developments in the anaerobic digestion process, including application of pre-treatment methods, implementation of anaerobic co-digestion and bioaugmentation strategies, trace elements supplementation, and utilisation of various bioreactors configurations. Moreover, the studies in the field of purification and utilisation of biogas, and also regarding improving energy efficiency of AD are in demand.

Dr. Aleksandra Szaja
Guest Editor

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Keywords

  • pre-treatment methods
  • industrial wastewater
  • organic waste
  • production, purification and utilisation of biogas
  • anaerobic co-digestion
  • bioaugmentation
  • trace elements supplementation
  • biochar application
  • lignocellulosic biomass
  • improving energy efficiency
  • circular economy
  • life cycle assessment
  • nutrient recovery and digestate management
  • modelling and process optimization
  • digesters design

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Published Papers (2 papers)

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Research

24 pages, 2525 KiB  
Article
Application of Recycled Filling to Improve the Purification Performance of Confectionery Wastewater in a Vertical Anaerobic Labyrinth Flow Bioreactor
by Marcin Dębowski, Joanna Kazimierowicz, Aneta Ignaciuk, Sandra Mlonek and Marcin Zieliński
Energies 2024, 17(11), 2551; https://doi.org/10.3390/en17112551 - 24 May 2024
Viewed by 855
Abstract
Anaerobic wastewater treatment is, in many cases, a justified alternative to typical activated sludge processes, from a technological, economic, and ecological point of view. The optimisation of fermentation reactors is primarily concerned with increasing the biodegradation of organic compounds and biogas production, as [...] Read more.
Anaerobic wastewater treatment is, in many cases, a justified alternative to typical activated sludge processes, from a technological, economic, and ecological point of view. The optimisation of fermentation reactors is primarily concerned with increasing the biodegradation of organic compounds and biogas production, as well as improving efficiency in the removal of nitrogen and phosphorus compounds. The aim of the research was to determine the impact of using low-cost recycled filling on the efficiency of treating real confectionery wastewater in a vertical anaerobic labyrinth flow bioreactor. The experiments focused on selecting the organic loading rate that would allow for the effective biodegradation and removal of pollutants, as well as the efficient production of biomethane. It was found that the tested reactor can operate efficiently at a maximum organic loading rate (OLR) of 7.0–8.0 g of chemical oxygen demand (COD)/L·d. In this OLR range, high efficiency was guaranteed for both wastewater treatment and biogas production. However, increasing the OLR value to 8.0 g COD/L·d had a significant negative effect on the methane (CH4) content in the biogas. The most efficient variants achieved a biodegradation efficiency of around 90% of the organic compounds, a CH4 content of over 70% in the biogas, and a biogas yield of over 400 L/kg of COD removed. A significant influence of the applied OLR on the ratio of free organic acids (FOS) to total alkaline capacity (TAC) and pH was observed, as well as a strong correlation of these indicators with the specific biogas yield and CH4 content. The application of a solution based on the use of a hybrid system of anaerobic granulated sludge and an anaerobic filter resulted in an efficient treatment process and an almost complete elimination of suspensions from the wastewater. Full article
(This article belongs to the Special Issue Anaerobic Digestion of Wastewater for Renewable Energy Production)
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15 pages, 2346 KiB  
Article
Pre-Treatment of Spent Coffee Grounds Using Hydrodynamic Cavitation
by Aleksandra Szaja, Agnieszka Montusiewicz, Sylwia Pasieczna-Patkowska, Elżbieta Grządka, Jerzy Montusiewicz and Magdalena Lebiocka
Energies 2024, 17(9), 2229; https://doi.org/10.3390/en17092229 - 6 May 2024
Cited by 2 | Viewed by 1468
Abstract
Spent coffee grounds (SCGs) constitute the main solid residue of the coffee brewing process. SCGs are generated in significant amounts daily, worldwide. The effective management of this waste through biological processes is still an unresolved problem. In this study, the application of hydrodynamic [...] Read more.
Spent coffee grounds (SCGs) constitute the main solid residue of the coffee brewing process. SCGs are generated in significant amounts daily, worldwide. The effective management of this waste through biological processes is still an unresolved problem. In this study, the application of hydrodynamic cavitation (HC) as a pre-treatment method for improving the biodegradability of SCGs suspended in municipal wastewater was proposed. An orifice plate with a conical concentric hole having inlet/outlet diameter of 3/10 mm was applied as the cavitation inducer. Three inlet pressures were chosen: 3, 5 and 7 bar. The effects in time intervals of 0, 5, 10, 20, 30 and 45 min were evaluated. The application of HC led to enhanced biodegradability for each case. The results of multi-criteria decision indicated that the most efficient combination in terms of biodegradability and energy usage was obtained at the pressure of 5 bar and duration of 20 or 30 min, depending on the adopted weights. The improvements of DOC/TOC (dissolved organic carbon/total organic carbon) ratio were 57% and 71%, as compared to the untreated samples. The release of caffeine was found at pressures of 5 and 7 bar. However, at 5 bar, this effect was noticed for the longest times, 30 and 45 min, respectively. Full article
(This article belongs to the Special Issue Anaerobic Digestion of Wastewater for Renewable Energy Production)
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