Article
Biotechnology & Applied Microbiology
Eva Maria Prem, Rudolf Markt, Mathias Wunderer, Andreas Otto Wagner
Summary: Efficient biogas production from organic waste is crucial for achieving carbon neutrality in the future. This study investigated the further digestion of thermophilic press water from a municipal solid waste digester using a combination of thermo- and mesophilic posttreatment methods. The results demonstrated that the press water still had significant biogas potential, particularly during the high season in central Europe. While there was an initial decrease in biogas production during the mesophilic posttreatment, the overall losses could be compensated, resulting in no significant difference in biogas production between the thermo- and mesophilic approaches. These findings suggest that the change in microbial community and the enhanced degradation of problematic intermediates, such as valerate, in the mesophilic reactor contribute to this compensatory effect.
BIOTECHNOLOGY AND BIOENGINEERING
(2023)
Article
Engineering, Environmental
Bikash R. Tiwari, Satinder Kaur Brar, Rao Y. Surampalli
Summary: Thermophilic anaerobic digestion is a viable strategy to reduce municipal sludge volume and generate renewable energy. In this study, ultrasonication was found to be the best pretreatment method to enhance the digestion process.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Review
Green & Sustainable Science & Technology
Md Abdul Moktadir, Mohammed Mizanur Rahman
Summary: Solid waste generated from the leather industry is a major environmental challenge in developing countries such as Bangladesh. Mismanagement of these wastes has negative impacts on public health and socio-economic conditions. Sustainable energy generation can help in managing these wastes effectively and protect the environment.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Agricultural Engineering
Hao Jiang, Fan Wu, Yuchang Wang, Lu Feng, Hongjun Zhou, Yeqing Li
Summary: In-situ hydrogen biomethanation is a promising technology for upgrading biogas quality, and investigating its characteristics under different conditions is crucial for its effectiveness. The experiments showed that hydrogenotrophic methanogenesis performed better at thermophilic conditions, with the highest methane content obtained when H2 and CO2 were fed at a 4:1 ratio with Methanothermobacter as the dominant genus.
BIORESOURCE TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Natalia de Souza Ribeiro, Regina Mambeli Barros, Ivan Felipe Silva dos Santos, Geraldo Lucio Filho, Samuel Placidio Galdino da Silva
Summary: This study evaluates the potential electric power generation using biogas derived from municipal solid waste stations in Sao Paulo and Minas Gerais, Brazil, operating under landfill technology and anaerobic digesters. The analysis shows positive energy results for both systems, with favorable financial outcomes especially for ventures using biogas from sanitary landfills. Systems considering the energy compensation system had the best results in both scenarios.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Engineering, Chemical
Mawaheb Mouftahi, Nawel Tlili, Nejib Hidouri, Pietro Bartocci, Khalideh Al Bkoor Alrawashdeh, Eid Gul, Federica Liberti, Francesco Fantozzi
Summary: The study in Tunisia focuses on evaluating the biogas and bio-methane yield from the co-digestion of three available bio-wastes in the southern regions, which showed a high methane production and reduced the amount of wastes to dispose of. The experimental work under specific conditions resulted in a high yield of net methane and net biogas, with a significant reduction in volatile solids and a hydraulic retention time of 40 days.
Article
Agricultural Engineering
Mirko Cucina, Daniela Pezzolla, Chiara Tacconi, Giovanni Gigliotti
Summary: This study aimed to investigate anaerobic co-digestion of lignocellulosic residues and the role of soluble organic matter, showing that co-digestion can increase biomethane yields with a positive correlation to soluble organic matter. Fruit wastes and brewery trub positively affected anaerobic digestion of lignocellulosic residues, but fruit waste co-digestion may lead to early acidification.
BIOMASS & BIOENERGY
(2021)
Article
Engineering, Environmental
Antonio Randazzo, Francesca Zorzi, Stefania Venturi, Gabriele Bicocchi, Gregorio Viti, Fabio Tatano, Franco Tassi
Summary: A 28-day laboratory experiment was conducted to investigate the compositional changes affecting the main components and non-methane volatile organic compounds in biogas generated from food waste anaerobic digestion. The results showed that CH4 and H2 were efficiently degraded in the soil column and the isotopic values of CH4 and CO2 in the soil column were relatively enriched. Aromatic compounds and alkanes were the most abundant in the biogas samples. The study highlights the need to minimize diffuse landfill gas emissions by reducing the enrichment of recalcitrant toxic and polluting compounds in the soil column.
Article
Green & Sustainable Science & Technology
Purwanta, Ardian Indra Bayu, Melly Mellyanawaty, Arief Budiman, Wiratni Budhijanto
Summary: This study conducted a techno-economic analysis comparing two types of thermophilic anaerobic reactors and three biogas utilization schemes. The results showed that the Fixed Bed Reactor (FBR) produced twice as much biogas as the Continuous Stirred Tank Reactor (CSTR) under the same conditions. The economic analysis indicated that co-firing in existing boilers by fuel-oil replacement and partial substitution of coal was more economically attractive than electricity production at the current electricity pricing in Indonesia.
Article
Environmental Sciences
Khathapon Pinpatthanapong, Tunyaporn Puengpraput, Songkeart Phattarapattamawong, Chantaraporn Phalakornkule, Pornpan Panichnumsin, Nimaradee Boonapatcharoen, Phimchaya Paensiri, Kanokwan Malila, Nattapong Ponata, Thakrit Ngamcharoen, Rumpa Jutakanoke, Arnon Setsungnern, Yordkhuan Tachapermpon, Chairat Treesubsuntorn, Jarungwit Boonnorat
Summary: This research investigates the use of propionate-cultured sludge to enhance methane production from upflow anaerobic sludge blanket systems (UASB) treating fresh landfill leachate. The experimental results showed that the optimal OLR for UASB 1 without augmentation was 48.2 gCOD/L dot d, achieving a CH4 production of 4019 mL/d. On the other hand, the optimal OLR for UASB 2 with propionate-cultured sludge augmentation was 12.0 gCOD/L dot d, achieving a CH4 yield of 6299 mL/d.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Agricultural Engineering
Chuanren Qi, Rui Wang, Sumeng Jia, Jie Chen, Yangyang Li, Jiaxing Zhang, Guoxue Li, Wenhai Luo
Summary: Biochar has been proven to enhance anaerobic digestion of organic solid wastes by promoting organic biodegradation and aiding in the removal of vexing contaminants, making it a promising auxiliary material in waste treatment.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Matteo Palu, Maria Peprah, Panagiotis Tsapekos, Panagiotis Kougias, Stefano Campanaro, Irini Angelidaki, Laura Treu
Summary: This study investigates the effects of bioaugmentation on the co-digestion of cheese whey and manure in a continuous stirred tank reactor under in-situ biomethanation operations. The addition of Methanoculleus bourgensis in the mesophilic reactor resulted in a stable biomethanation process and increased methane production rate. On the other hand, the addition of Methanothermobacter thermautotrophicus in the thermophilic reactor did not improve biogas upgrading performance.
BIORESOURCE TECHNOLOGY
(2022)
Review
Energy & Fuels
Mohsen Karrabi, Fahime Mosadegh Ranjbar, Bahar Shahnavaz, Saba Seyedi
Summary: Recently, there has been growing interest in using organic or biodegradable wastes, including lignocellulosic wastes (LWs), as renewable energy sources. Anaerobic digestion (AD) of these wastes can mitigate environmental damage and produce biogas and bioenergy, which is particularly valuable in developing countries. However, there are several challenges to overcome, such as waste floating on top of reactors, high carbon-to-nitrogen ratio (CNR), complex structure of LWs, and poor degradability due to high lignin content. These challenges can be addressed through methods like mixing in reactors, reducing CNR, balancing inoculum-to-substrate ratio (ISR), and pretreatments. This study aims to review the literature on AD of LWs, identify existing challenges, and propose strategies to improve bioenergy production from this waste.
Article
Agricultural Engineering
Audrey Chai, Yee-Shian Wong, Soon-An Ong, Nabilah Aminah Lutpi, Sung-Ting Sam, Wei-Chin Kee, Hock-Hoo Ng
Summary: The study demonstrated that anaerobic degradation of sugarcane vinasse in ASGCB performed well with longer hydraulic retention time (HRT 35-25 days), showing a low degree of substrate inhibition.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Miguel A. Vital-Jacome, German Buitron
Summary: This study evaluates a two-stage process for treating highly concentrated winery effluents, with a focus on a thermophilic methanogenic stage. Results show that higher organic loading rates in the acidogenic stage lead to higher acetic acid concentrations, while the thermophilic methanogenic stage can achieve high methane production rates and yield. Lower feeding frequencies improve methane productivity and yield, indicating that this parameter is a useful process optimization tool.
