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Processes
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Anaerobic Bioenergy Production Technology and Anaerobic Biogas Production
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Anaerobic Bioenergy Production Technology and Anaerobic Biogas Production

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Environmental and Green Processes".

Deadline for manuscript submissions: closed (15 April 2021) | Viewed by 8807

Special Issue Editors

Dr. Chyi-How Lay

E-Mail Website
Guest Editor
Master's Program of Green Energy Science and Technology, Feng Chia University, Taichung 40724, Taiwan
Interests: anaerobic digestion; biohydrogen; microbial fuel cell; agriculture waste
Special Issues, Collections and Topics in MDPI journals
Dr. Hoang-Jyh Leu

E-Mail Website
Guest Editor
Master's Program of Green Energy Science and Technology, Feng Chia University, Taichung 40724, Taiwan
Interests: biomass pretreatment; bio refinery; biogas purification; electrochemistry

Special Issue Information

Dear Colleagues,

Sustainable bioenergy, especially biogas production technology, has been continuously given a major spotlight in recent decades. The advancement in various technologies has led to the exploitation of organic waste materials, not only upholding the circular economy’s philosophy, but also leading to improvements in process efficiency, cost reduction, sustainable waste management and higher energy recovery yield. Despite being a relatively mature and proven technology, the application of biogas in industry as a major source of energy remains low. There are many essential elements and factors for a successful biogas system that are vaguely understood and have not been reported structurally. Thus, this is continuously driving further research, investigation, and development in the anaerobic digestion process that should be reported and shared with a wider audience. These reports are important for providing guidance and references for both novice and experienced biogas technology practitioners.

Dr. Chyi-How Lay
Dr. Hoang-Jyh Leu
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. Processes is an international peer-reviewed open access monthly 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 2400 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

  • Renewable bioenergy
  • Biogas, biomethane, biohydrogen, biohythane
  • Anaerobic digestion case study
  • Sustainable waste management
  • Biogas upgrading, storage and utilization
  • Bioenergy production technology scale up
  • Techno-economics feasibility studies
  • Life cycle of bioenergy production
  • Circular solutions and system integration for green bioenergy

Published Papers (3 papers)

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Research

17 pages, 1579 KiB  
Article
Enhancement of Thermophilic Biogas Production from Palm Oil Mill Effluent by pH Adjustment and Effluent Recycling
by Apinya Singkhala, Chonticha Mamimin, Alissara Reungsang and Sompong O-Thong
Processes 2021, 9(5), 878; https://0-doi-org.brum.beds.ac.uk/10.3390/pr9050878 - 17 May 2021
Cited by 5 | Viewed by 3290
Abstract
A sudden pH drops always inhibits the anaerobic digestion (AD) reactor for biogas production from palm oil mill effluent (POME). The pH adjustment of POME by oil palm ash addition and the biogas effluent recycling effect on the preventing of pH drop and [...] Read more.
A sudden pH drops always inhibits the anaerobic digestion (AD) reactor for biogas production from palm oil mill effluent (POME). The pH adjustment of POME by oil palm ash addition and the biogas effluent recycling effect on the preventing of pH drop and change of the archaea community was investigated. The pH adjustment of POME to 7.5 increased the methane yield two times more than raw POME (pH 4.3). The optimal dose for pH adjustment by oil palm ash addition was 5% w/v with a methane yield of 440 mL-CH4/gVS. The optimal dose for pH adjustment by biogas effluent recycling was 20% v/v with a methane yield of 351 mL-CH4/gVS. Methane production from POME in a continuous reactor with pH adjustment by 5% w/v oil palm ash and 20% v/v biogas effluent recycling was 19.1 ± 0.25 and 13.8 ± 0.3 m3 CH4/m3-POME, respectively. The pH adjustment by oil palm ash enhanced methane production for the long-term operation with the stability of pH, alkalinity, and archaea community. Oil palm ash increased the number of Methanosarcina mazei and Methanothermobacter defluvii. Oil palm ash is a cost-effective alkali material as a source of buffer and trace metals for preventing the pH drop and the increased methanogen population in the AD process. Full article
(This article belongs to the Special Issue Anaerobic Bioenergy Production Technology and Anaerobic Biogas Production)
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12 pages, 1016 KiB  
Article
Comparison of Potential Environmental Impacts and Waste-to-Energy Efficiency for Kitchen Waste Treatment Scenarios in Central Taiwan
by Meng-Fen Shih, Chiu-Yue Lin and Chyi-How Lay
Processes 2021, 9(4), 696; https://0-doi-org.brum.beds.ac.uk/10.3390/pr9040696 - 15 Apr 2021
Cited by 7 | Viewed by 2309
Abstract
Taiwan has a sound solid waste recycling system, and waste-to-energy is attractive under the encouragement policy and economic feasibility, especially in central and southern regions with vast agricultural wastes. The four scenarios evaluated in this study relating to current use or under consideration [...] Read more.
Taiwan has a sound solid waste recycling system, and waste-to-energy is attractive under the encouragement policy and economic feasibility, especially in central and southern regions with vast agricultural wastes. The four scenarios evaluated in this study relating to current use or under consideration for kitchen waste treatment strategy in Taiwan were incineration, landfill, composting, and anaerobic digestion. These scenarios were compared through life cycle assessment to obtain the most preferable treatment solution. The analysis was based on a functional unit, i.e., 1 metric ton of kitchen waste treated, and considered all impact categories through the CML_IA baseline 2000 method. It has shown that energy recovery had enormous effects on all scenarios with the anaerobic digestion having the highest environmental performance change. A comparison between actual electricity consumption and estimated electricity generation by kitchen waste treatment through anaerobic digestion indicates that decentralized electricity generation was suitable for central Taiwan and could be considered as the energy solution in a short-term context. This study provides an experience in selecting a proper waste-to-energy method with the most negligible environmental impact. Full article
(This article belongs to the Special Issue Anaerobic Bioenergy Production Technology and Anaerobic Biogas Production)
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23 pages, 6479 KiB  
Article
Modeling and Experimental Validation of Compression and Storage of Raw Biogas
by Marek Mysior, Paweł Stępień and Sebastian Koziołek
Processes 2020, 8(12), 1556; https://0-doi-org.brum.beds.ac.uk/10.3390/pr8121556 - 27 Nov 2020
Cited by 5 | Viewed by 2622
Abstract
A significant challenge in sustainability and development of energy systems is connected with limited diversity and availability of fuels, especially in rural areas. A potential solution to this problem is compression, transport, and storage of raw biogas, that would increase diversity and availability [...] Read more.
A significant challenge in sustainability and development of energy systems is connected with limited diversity and availability of fuels, especially in rural areas. A potential solution to this problem is compression, transport, and storage of raw biogas, that would increase diversity and availability of energy sources in remote areas. The aim of this study was to perform experimental research on raw biogas compression concerning biogas volume that can be stored in a cylinder under the pressure of 20 MPa and to compare obtained results with numerical models used to describe the state of gas at given conditions. Results were used to determine the theoretical energy content of raw biogas, assuming its usage in CHP systems. In the study, six compression test runs were conducted on-site in an agricultural biogas plant. Compression time, pressure as well as gas volume, and temperature rise were measured for raw biogas supplied directly from the digester. Obtained results were used to evaluate raw biogas compressibility factor Z and were compared with several equations of state and numerical methods for calculating the Z-factor. For experimental compression cycles, a theoretical energy balance was calculated based on experimental results published elsewhere. As a result, gas compressibility factor Z for storage pressure of 20 MPa and a temperature of 319.9 K was obtained and compared with 6 numerical models used for similar gases. It was shown that widely known numerical models can predict the volume of compressed gas with AARE% as low as 4.81%. It was shown that raw biogas supplied directly from the digester can be successfully compressed and stored in composite cylinders under pressure up to 20 MPa. This proposes a new method to utilize raw biogas in remote areas, increasing the diversity of energy sources and increasing the share of renewable fuels worldwide. Full article
(This article belongs to the Special Issue Anaerobic Bioenergy Production Technology and Anaerobic Biogas Production)
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