Article
Agricultural Engineering
Sungyun Jung, Minjae Kim, Juyun Lee, Juhee Shin, Seung Gu Shin, Joonyeob Lee
Summary: This study found that magnetite supplementation can significantly improve methanogenic degradation of phenol and benzoate, increasing methane production rates and reducing lag time, without reducing methane yield. Active microbial communities involved in the anaerobic digestion of phenol and benzoate were also identified, including Geobacter, Peptoclostridium, and Methanosaeta harundinacea.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Jiadong Yu, Lixin Zhao, Zonglu Yao, Jing Feng, Xufeng Yuan, Hongliang Wang, Yi Liang, Jiankun Chen, Yizhuo Du, Ruixia Shen
Summary: The study investigates the synergistic characteristics of abiotic and biotic transformation to improve the methane production efficiency in thermophilic and mesophilic sequencing batch dry anaerobic digestion (SBDAD). A pilot scale experiment using corn straw and cow dung as lignocellulosic material shows significant differences in biogas production and VFA concentration and composition. The combination of first-order hydrolysis and a modified Gompertz model increases cellulose and hemicellulose conversion efficiency by 112.03% and 90.09%, respectively, at thermophilic temperatures. The microbial community exhibits different functional network relationships under the two temperature conditions. Simulation of SBD-AD engineering shows reduced heat energy consumption and increased net energy production at thermophilic temperatures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Biotechnology & Applied Microbiology
Tianjie Ao, Zhijie Xie, Pan Zhou, Xiaofeng Liu, Liping Wan, Dong Li
Summary: The study found differences in the microbial community composition and methane production mechanism between mesophilic and thermophilic digestion of vegetable waste. High concentrations of volatile fatty acids led to severe inhibition of methanogens, with mesophilic digestion exhibiting higher microbial diversity and richness than thermophilic digestion.
BIOPROCESS AND BIOSYSTEMS ENGINEERING
(2021)
Article
Environmental Sciences
Li-Jie Wu, Xiao-Xiao Li, Fan Yang, Quan Zhou, Rui-Peng Ren, Yong-Kang Lyu
Summary: Anaerobic digestion is a promising waste-to-energy technology, with hyperthermophilic and thermophilic microbial communities showing potential for efficiency improvement. Mesophilic digested sludge was used as inoculum, with hyperthermophilic digestion exhibiting higher hydrolysis ratio and thermophilic digestion showing higher methane proportion. Methanogenesis was found to be limited in the hyperthermophilic digestion, indicating the need for a pre-fermentation stage at 70 degrees C for enhanced hydrolysis.
Article
Environmental Sciences
Zong-Lin Wu, Quan Zhang, Zi-Yuan Xia, Min Gou, Zhao-Yong Sun, Yue-Qin Tang
Summary: This study investigated the effects of fluctuation disturbance of organic loading rate (OLR) on anaerobic digestion (AD) of municipal sludge. The performance of the AD reactors remained similar before and after disturbance, indicating their buffer capacity to OLR periodic fluctuation. Different microbial community at RNA level was observed in the two reactors, with greater changes in the thermophilic AD. The results showed that the thermophilic microbial community was more vulnerable, but the reactor performance could be maintained using the functional redundancy strategy under OLR fluctuation disturbance.
ENVIRONMENTAL RESEARCH
(2023)
Article
Agricultural Engineering
M. L. Christou, S. Vasileiadis, S. D. Kalamaras, D. G. Karpouzas, I. Angelidaki, T. A. Kotsopoulos
Summary: In this study, the operation of three CTSRs under different OLR conditions revealed that increasing the OLR to raise the C/N ratio can intensify the inhibition of anaerobic processes, especially under high ammonia concentration. Different responses of bacterial and archaeal communities were observed under ammonia stress conditions. Additionally, the dominant methanogenesis route varied depending on the OLR and ammonia concentration.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Sergi Astals, Juan Jose Chavez-Fuentes, Gabriel Capson-Tojo, Miroslav Hutnan, Paul D. Jensen
Summary: Studies have shown that LCFA can alleviate the inhibition of ammoniacal nitrogen to a certain extent, possibly due to the formation of a protective layer by LCFA that limits the diffusion of free ammonia into the cell, or provides a localized lower pH around the microbial cell. However, the inhibition of ammoniacal nitrogen and LCFA also involve other inhibitors, and the specific mechanisms are not fully understood.
Article
Energy & Fuels
Jingxin Zhang, Jiaqi Chen, Ruize Ma, Vinod Kumar, Yen Wah Tong, Yiliang He, Feijian Mao
Summary: This study investigated the efficiency and mechanisms of anaerobic digestion (AD) of different types of animal waste. The results showed that thermophilic AD had higher methane production and increased enzyme activity. High-DNA bacteria were more sensitive to environmental conditions. The findings provide valuable insights into the sustainable management of animal waste.
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
Elvira E. Ziganshina, Svetlana S. Bulynina, Ayrat M. Ziganshin
Summary: This study found that the addition of GAC can enhance the consumption of organic acids and accelerate biomethane production during anaerobic digestion of chicken manure; however, the increase in free ammonia levels in thermophilic reactors may lead to process instability. Additionally, microbial community structures differ at different temperatures.
Article
Thermodynamics
Kavosh Karami, Keikhosro Karimi, Safoora Mirmohamadsadeghi, Rajeev Kumar
Summary: This study investigated the effects of biological pretreatment on biogas production from lignocellulosic biomass and studied the combination effect with other pretreatment methods. The results showed that aerobic digestion was the only pretreatment method that could individually improve methane yield from pinewood, but combining aerobic digestion with mild thermochemical pretreatment could achieve even higher methane yield.
Article
Energy & Fuels
Jingmiao Zhang, Shuai Wu, Ao Xia, Dong Feng, Yun Huang, Xianqing Zhu, Xun Zhu, Qiang Liao
Summary: Anaerobic digestion (AD) technology is an effective method for biogas production and livestock waste treatment. This study investigated the impact of oxytetracycline (OTC) on the AD process and found that OTC significantly inhibited methane production, with methane yields decreasing by 58.6% and 73.3% in mesophilic and thermophilic ADs respectively at an initial OTC concentration of 400 mg/L. OTC can be degraded by the AD process with a removal efficiency above 90% at lower concentrations. Higher OTC concentrations resulted in lower bio-methane yield, energy conversion efficiency, and contaminant removal in both mesophilic and thermophilic ADs.
Article
Agricultural Engineering
Hong Chen, Rong Huang, Jun Wu, Wenzhe Zhang, Yunping Han, Benyi Xiao, Dongbo Wang, Yaoyu Zhou, Bing Liu, Guanlong Yu
Summary: Biohythane production was successfully achieved through temperature-phased anaerobic co-digestion of rice straw and pig manure, with effective selective pressure for hydrogen-consuming microbes during the thermophilic acid-producing phase. However, hydrolysis could be a rate-limiting step in the process.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Wen Li, Lirong Zhu, Baocun Wu, Yongli Liu, Jinze Li, Linji Xu, Xiaoliu Huangfu, Dezhi Shi, Li Gu, Cong Chen
Summary: This study adopted a side-stream thermophilic anaerobic digestion (STA) strategy to improve the efficiency and stability of a digestive system. The results showed that STA strategy not only increased methane production and system stability, but also optimized organic metabolism patterns and promoted methane production pathways through enhanced enzyme activity.
Article
Engineering, Environmental
Jiri Rusin, Katerina Chamradova, Panagiotis Basinas
Summary: Anaerobic digestion of food waste at low temperature can efficiently produce biomethane. The two-stage low-temperature reactor is more energy-efficient and operates stably compared to mesophilic reactors.
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)