Article
Engineering, Environmental
Junkai Hu, Yongde Liu, Xue Song, Jihong Zhao, Qiaochong He
Summary: This study investigated the potential of using Brassica chinensis waste (BCW) for anaerobic fermentative production of volatile fatty acids (VFA). The results showed that stacking time, initial pH, inoculum dose, and temperature all had significant effects on VFA yield and the microbial community structure. Stacking BCW for 3 days resulted in the highest VFA yield of 187.79 mgCOD/gVS. VFA production was inhibited under acidic and alkaline conditions, and the optimal inoculum dose was found to be 2 gTS/L. Firmicutes and Proteobacteria were identified as the dominant microorganisms involved in the acid production step of hydrolysis in anaerobic fermentation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Kasra Khatami, Merve Atasoy, Maximilian Ludtke, Christian Baresel, Ozge Eyice, Zeynep Cetecioglu
Summary: The study investigated the impact of different sludge inoculums, pH levels, and retention times on the generation of VFAs during anaerobic digestion of food waste. Acetic acid was the dominant product under alkaline conditions, while propionic and acetic acids were dominant under acidic conditions.
Review
Environmental Sciences
Ashutosh Kumar Pandey, S. Pilli, P. Bhunia, R. D. Tyagi, Y. Rao Surampalli, C. Tian Zhang, Sang-Hyoun Kim, Ashok Pandey
Summary: VFAs are the building blocks of the chemical industry and play a key role in the planet's organic carbon cycle. To address the issues of unsustainable VFA production from fossil fuels, it is crucial to develop alternate sources through anaerobic digestion. By researching accessible feedstocks, influencing parameters, and utilizing VFAs to create consumer products, economic stability can be achieved through traditional and advanced production methods.
Article
Agricultural Engineering
Mekdimu Mezmir Damtie, Jingyeong Shin, Hyun Min Jang, Hyun Uk Cho, Jinhua Wang, Young Mo Kim
Summary: The temperature-phased anaerobic digestion affects the hydrolysis and biomethane potential of microalgae biodegradation, depending on the anaerobic and aerobic pretreatments at different temperatures and microbial diversity. Statistical analysis reveals correlations between temperature and different parameters, with strong correlation between soluble nitrogen and phosphorous with methane under thermoanaerobic pretreatment.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Ben-Yan Li, Zi-Yuan Xia, Min Gou, Zhao-Yong Sun, Yu-Lian Huang, Shuo-Bo Jiao, Wen-Ying Dai, Yue-Qin Tang
Summary: This study investigated the performance and microbial community dynamics of an anaerobic VFA production reactor for treating fruit waste. The results showed that increasing the organic loading rate resulted in higher VFA concentrations and yields, with acetate and butyrate being the dominant products. The microbial community analysis revealed the presence of Lactobacillus, Clostridium_sensu_stricto_12, and Caproiciproducens genera, which were closely associated with anaerobic VFA production.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Xiaonan Zhou, Yu Lu, Liu Huang, Qi Zhang, Xiangyou Wang, Jiying Zhu
Summary: The study investigated the effects of pH on the production of volatile fatty acids and evolution of microbial community structure during anaerobic fermentation of Chinese cabbage waste. The results showed variations in VFA production and microbial community composition under different pH conditions.
BIORESOURCE TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Natalia Rey-Martinez, Ruben Rodriguez-Alegre, Xialei You, Sergio Martinez-Lozano, Eduard Borras, Julia Garcia-Montan
Summary: In recent years, municipal waste management has gained much attention due to its increasing costs and impacts on public health, the environment, society, and the economy. There is an urgent need to adopt sustainable alternatives and circular economy approaches. This study proposes a decentralized waste management system using anaerobic digestion to valorise organic wastes in residential buildings, which resulted in the production of biogas with a high methane content and low impurities.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2023)
Article
Energy & Fuels
Puneet Kumar Singh, Haragobinda Srichandan, Sanjay Kumar Ojha, Ritesh Pattnaik, Sunil Kumar Verma, Sreyasi Pal, Jagriti Singh, Snehasish Mishra
Summary: The study found that codigestion of sheep manure and kitchen refuse can increase biogas production, with the optimal ratio being 40:60. This method can enhance biomethanation efficiency by balancing the C:N ratio.
BIOMASS CONVERSION AND BIOREFINERY
(2021)
Review
Agricultural Engineering
Siran Feng, Huu Hao Ngo, Wenshan Guo, Soon Woong Chang, Dinh Duc Nguyen, Yi Liu, Shicheng Zhang, Hoang Nhat Phong Vo, Xuan Thanh Bui, Bich Ngoc Hoang
Summary: This review provides an overview of the roles and applications of enzymes in volatile fatty acids production, as well as feasible measures to enhance enzyme processes. It critically evaluates the major obstacles and possible future research directions for the better utilization of enzymatic processes in promoting volatile fatty acids production from wastewater.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Borja Lagoa-Costa, Christian Kennes, Maria C. Veiga
Summary: The study aimed to investigate the microbial dynamics in response to a gradual change in feedstock composition during co-digestion of cheese whey and brewery wastewater, as well as its impact on PHA production. The results showed that the microbial community changed as the feedstock ratio gradually increased, leading to alterations in VFA profile and monomeric composition of the biopolymer.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Multidisciplinary Sciences
Brandon Kieft, Niko Finke, Ryan J. Mclaughlin, Aditi N. Nallan, Martin Krzywinski, Sean A. Crowe, Steven J. Hallam
Summary: This study presents a two-year investigation of microbial community structure and function at a wastewater treatment plant, revealing metabolic interactions between microorganisms in relation to methane production.
NATURE COMMUNICATIONS
(2023)
Article
Green & Sustainable Science & Technology
B. Tonanzi, A. Gallipoli, A. Gianico, D. Montecchio, P. Pagliaccia, S. Rossetti, C. M. Braguglia
Summary: This study reveals that the robustness and reliability of anaerobic digestion process are critically influenced by the composition of microbial populations and process parameters during long-term operation. Addition of a minimal amount of sludge at high OLR can enhance methane production rates and create a methanogen community with high biodiversity.
Article
Engineering, Environmental
Resty Nabaterega, Ibrahim Alper Basar, Cigdem Eskicioglu
Summary: This study investigates the optimization of volatile fatty acids (VFAs) production through anaerobic digestion (AD) by evaluating the impact of digester sludge retention time (SRT), temperature, and pH on the reactor performance. The results show that fermenters operated at high pH of 8, low SRT of 2 days, and varying temperatures of 55 and 45 degrees C have the highest VFAs production. Batch acidogenic assays provide quantitative information regarding the presence and activities of cultures in continuously-fed AD, offering insights for utilizing more complex substrates.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Review
Engineering, Environmental
Yao Zhang, Chunxing Li, Zengwei Yuan, Ruming Wang, Irini Angelidaki, Gefu Zhu
Summary: This review summarizes the roles of syntrophic bacteria and methanogens in the anaerobic digestion (AD) process, revealing the mechanisms of metabolism pathways, microbial characteristics, substrate oxidation, and electron transfer in syntrophic methanogenesis. The review also provides an overview of process control and optimization methods for improving the efficiency of syntrophic methanogenesis.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Umarin Jomnonkhaow, Clarisse Uwineza, Amir Mahboubi, Steven Wainaina, Alissara Reungsang, Mohammad J. Taherzadeh
Summary: Cow manure has long been seen as a waste management challenge, but its organic content presents opportunities for producing value-added bioproducts like VFAs through anaerobic digestion. This study applied thermal pretreatment to inhibit methanogens and utilized an immersed membrane bioreactor for in situ recovery of VFAs, achieving stable long-term production and recovery.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Yinping Xiang, Meiying Jia, Rui Xu, Jialu Xu, Lele He, Haihao Peng, Weimin Sun, Dongbo Wang, Weiping Xiong, Zhaohui Yang
Summary: This study investigated the impact of the non-antibiotic pharmaceutical carbamazepine on antibiotic resistance genes (ARGs) during anaerobic digestion. The results showed that carbamazepine induced the enrichment of ARGs and increased the abundance of bacteria carrying these genes. It also facilitated microbial aggregation and intercellular communication, leading to an increased frequency of ARGs transmission. Moreover, carbamazepine promoted the acquisition of ARGs by pathogens and elevated their overall abundance.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Weixin Zhao, Tianyi Hu, Hao Ma, Dan Li, Qingliang Zhao, Junqiu Jiang, Liangliang Wei
Summary: This review summarizes the effects and potential mechanisms of biochar on microbial behavior in AD systems. The addition of biochar has been found to promote microbial colonization, alleviate stress, provide nutrients, and enhance enzyme activity. Future research directions include targeted design of biochar, in-depth study of microbial mechanisms, and improved models.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Christina Karmann, Anna Magrova, Pavel Jenicek, Jan Bartacek, Vojtech Kouba
Summary: This review assesses nitrogen removal technologies in reject water treatment, highlighting the differences in environmental impacts and economic benefits. Partial nitritation-anammox shows potential for economic benefits and positive environmental outcomes when operated and controlled properly.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Wei-Hao Huang, Ying-Ju Chang, Duu-Jong Lee
Summary: This study modified pinecone biochar with layered double hydroxide (LDH) to enhance its adsorption capacity for heavy metal and phosphate ions. The LDH-biochar showed significantly improved adsorption capacities for Pb2+ and phosphate, and a slight increase for Cu2+ and Co2+. The LDH layer enhanced the adsorption through various mechanisms.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Chao Song, Fanfan Cai, Shuang Yang, Ligong Wang, Guangqing Liu, Chang Chen
Summary: This paper developed a machine learning model to predict the biochemical methane potential during anaerobic digestion. Model analysis identified lignin content, organic loading, and nitrogen content as key attributes for methane production prediction. For feedstocks with high cellulose content, early methane production is lower but can be improved by prolonging digestion time. Moreover, lignin content exceeding a certain value significantly inhibits methane production.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Sang Min Lee, Ju Young Lee, Ji-Sook Hahn, Seung-Ho Baek
Summary: This study successfully developed an efficient platform strain using Yarrowia lipolytica for the bioconversion of renewable resources into adipic acid, achieving a remarkable increase in production level.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Sefkan Kendir, Matthias Franzreb
Summary: This study presents a novel approach using magnetic separation to efficiently harvest freshwater microalgae, Chlorella vulgaris. By combining pH-induced calcium phosphate precipitation with cheap natural magnetite microparticles, harvesting efficiencies up to 98% were achieved in the model medium.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Ishaq Kariim, Ji-Yeon Park, Wajahat Waheed Kazmi, Hulda Swai, In-Gu Lee, Thomas Kivevele
Summary: The impact of reaction temperature, residence time, and ethanol: acetone on the energy compositions and yield enhancement of biocrudes was investigated. The results showed that under appropriate conditions, biocrudes with high energy and low oxygen content can be obtained, indicating a high potential for utilization.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Xiyue Zhang, Xiyao Li, Liang Zhang, Yongzhen Peng
Summary: Intermittent aeration is an innovative approach to enhance nitrogen removal in low carbon-to-nitrogen ratio municipal sewage, providing an efficient strategy for the continuous plug-flow AOA process.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Xu Yang, Mahmoud Mazarji, Mengtong Li, Aohua Li, Ronghua Li, Zengqiang Zhang, Junting Pan
Summary: This study investigated the impact of magnetite on the nitrogen cycle of pig manure biostabilisation. The addition of magnetite increased N2O emissions and decreased NH3 emissions during composting. It also increased the total nitrogen content but should be considered for its significant increase in N2O emissions in engineering practice.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Ty Shitanaka, Haylee Fujioka, Muzammil Khan, Manpreet Kaur, Zhi-Yan Du, Samir Kumar Khanal
Summary: The market value of microalgae has exponentially increased in the past two decades, thanks to their applications in various industries. However, the supply of high-value microalgal bioproducts is limited due to several factors, and strategies are being explored to overcome these limitations and improve microalgae production, thus increasing the availability of algal-derived bioproducts in the market.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Martin Kerner, Thorsten Wolff, Torsten Brinkmann
Summary: The efficiency of using enriched CO2 from flue gas for large-scale production of green microalgae has been studied. The results show that the use of membrane devices and static mixers can effectively improve the CO2 recovery rate and maintain the suitable pH and temperature during cultivation, achieving a more economical and sustainable microalgae production.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Rui Ma, Ji Li, Rd Tyagi, Xiaolei Zhang
Summary: This review summarizes the microorganisms capable of using CO2 and CH4 to produce PHAs, illustrating the production process, factors influencing it, and discussing optimization techniques. It identifies the challenges and future prospects for developing economically viable PHAs production using GHGs as a carbon source.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Bing Wang, Peng Zhang, Xu Guo, Xu Bao, Junjie Tian, Guomin Li, Jian Zhang
Summary: The addition of zeolite in the co-composting of chicken manure and straw significantly reduced the emissions of ammonia and N2O, and increased the nitrate content. Zeolite also promoted the abundance of nitrification genes and inhibited the expression of denitrification genes.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Rohit Dey, Franziska Ortiz Tena, Song Wang, Josef Martin Messmann, Christian Steinweg, Claudia Thomsen, Clemens Posten, Stefan Leu, Matthias S. Ullrich, Laurenz Thomsen
Summary: This study investigated the operation of a 1000L microalgae-based membrane photobioreactor system for continuous secondary wastewater treatment. The research focused on a green microalgae strain called Desmodesmus sp. The study aimed to understand key trends and optimization strategies by conducting experiments in both summer and winter seasons. The findings showed that maintaining low cell concentrations during periods of light inhibition was beneficial for nutrient uptake rates. Effective strategies for enhancing algae-based wastewater treatment included cell mass recycling and adjusting dilution rates based on light availability.
BIORESOURCE TECHNOLOGY
(2024)