Article
Environmental Sciences
Guanjing Cai, Lixin Zhao, Tao Wang, Nan Lv, Junjie Li, Jing Ning, Xiaofang Pan, Gefu Zhu
Summary: In this study, bioaugmentation with sludge acclimated with VFAs significantly improved methane yield. The interaction between acidified and acclimated sludges had a great impact on VFA consumption and methane production. Additionally, microbial community succession played a crucial role in the efficiency of bioaugmentation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Agricultural Engineering
Lei Zhang, Yiyang Yuan, Yingdi Zhang, Yang Liu
Summary: The study found that granular sludge structure is conducive to syntrophic reactions and enriches syntrophic acetate oxidation bacteria and methanogens. Different sludge morphologies have a significant impact on syntrophic activities.
BIORESOURCE TECHNOLOGY
(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
Agricultural Engineering
Gabriel Capson-Tojo, Sergi Astals, Angel Robles
Summary: This study updated the ADM1 model to improve accurate estimation of free ammonia concentrations and inhibition thresholds, while simulating acetate syntrophic oxidation as an acetate-consuming pathway. The modified ADM1 showed better predictions of methane production, VFA profiles, and microbial clades than the default ADM1, demonstrating improved accuracy in modeling anaerobic digestion processes.
BIORESOURCE TECHNOLOGY
(2021)
Article
Microbiology
Chao Li, Liping Hao, Fan Lu, Haowen Duan, Hua Zhang, Pinjing He
Summary: Syntrophic acetate oxidation plays a vital role in the anaerobic digestion of protein-rich feedstocks. This study enriched the syntrophic acetate-oxidizing bacteria (SAOB) community and identified both known and novel SAOB candidates through metagenomic analyses.
Article
Engineering, Environmental
Xiaofang Pan, Lixin Zhao, Chunxing Li, Irini Angelidaki, Nan Lv, Jing Ning, Guanjing Cai, Gefu Zhu
Summary: Acetate plays a crucial role in anaerobic decomposition of organic matter, with a complex network of generation and consumption covering most steps in the anaerobic digestion process. Syntrophic acetate oxidation (SAO) and homoacetogenesis are key processes in the production and consumption of acetate, influencing the efficiency of anaerobic digesters. This review provides insights into the biochemical reactions, metabolism pathways, and physiological characteristics of functional bacteria involved in acetate production and consumption.
Article
Engineering, Environmental
Manpreet Kaur, Prakash C. Sahoo, Manoj Kumar, Sarita Sachdeva, S. K. Puri
Summary: The addition of Fe3O4 and Ni NPs significantly accelerated substrate degradation rate and enhanced biomethane yield during anaerobic digestion of Azolla microphylla. The dominance of microbial species and enrichment of certain bacteria confirmed the efficient hydrolysis of Azolla biomass and enhanced methanogenesis via syntrophic metabolism of intermediate products. KEGG pathway analysis indicated the enhancement of major metabolic pathways in NPs-supplemented reactor, highlighting the stimulatory effect of NPs.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Anna A. Nikitina, Anna Y. Kallistova, Denis S. Grouzdev, Tat'yana V. Kolganova, Andrey A. Kovalev, Dmitriy A. Kovalev, Vladimir Panchenko, Ivar Zekker, Alla N. Nozhevnikova, Yuriy V. Litti
Summary: In this study, an enrichment culture of the thermophilic butyrate-oxidizing syntrophic consortium was obtained by gradually increasing the initial butyrate concentration. It was found that even the highest butyrate concentration did not significantly inhibit the methanogenic community, and the limiting factor in the process was acetate degradation. The enrichment culture was effective in mitigating the butyrate-dominated VFA build-up during the anaerobic digestion of readily biodegradable waste, increasing the methane production rate, methane yield, and volatile solids removal.
APPLIED SCIENCES-BASEL
(2023)
Review
Biochemical Research Methods
Elie Desmond-Le Quemener, Roman Moscoviz, Nicolas Bernet, Andrew Marcus
Summary: The study of mathematical modeling of DIET and MIET in anaerobic ecosystems offers new strategies for improving biotechnologies. While the modeling of DIET kinetics is still in its early stages, recent concepts introduced for modeling electroactive biofilms should be further developed. DIET shows potential to increase IET rates compared to H 2 -MIET, but additional characterizations of biological components supporting IET are needed to enhance predictions.
CURRENT OPINION IN BIOTECHNOLOGY
(2021)
Article
Agricultural Engineering
Chunhua He, Tingxia Liu, Hua Ou, Shoujun Yuan, Zhenhu Hu, Wei Wang
Summary: This study demonstrates a novel method to enhance the conversion rate of phenol to methane by coupling granular activated carbon and exogenous hydrogen (GAC/H2). The results show that the coupling of GAC and hydrogen significantly increased methane production compared to the control group. The enhancement of methane production was associated with changes in microbial communities, with GAC enhancing specific bacteria and hydrogen promoting methane-producing microorganisms.
BIORESOURCE TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Man Zhou, Cheng Li, Fuquan Ni, Anjun Chen, Meiliang Li, Guanghui Shen, Yu Deng, Liangwei Deng
Summary: In this study, the addition of granular activated carbon (GAC) improved the dry anaerobic digestion of chicken manure, reducing the inhibition caused by high ammonia nitrogen levels and increasing methane yield. Zeolite improved the early stage of anaerobic digestion, while medical stone (MS) did not show improvement.
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
Engineering, Environmental
Bing Guo, Yingdi Zhang, Najiaowa Yu, Yang Liu
Summary: DIET can enhance syntrophic propionate oxidization efficiency under room temperature conditions (20 degrees C). The microbial communities in GAC- and magnetite-supplemented reactors were similar, but different from the control reactor. Co-occurrence network revealed the syntrophic propionate-oxidizing bacteria and methanogenesis partners, such as Methanobacterium correlated with Smithella, Syntrophobacter, Dechloromonas, and Trichococcus.
WATER ENVIRONMENT RESEARCH
(2021)
Article
Environmental Sciences
Raquel Barrena, Maria del Carmen Vargas-Garcia, Georgina Capell, Victor Puntes, Javier Moral-Vico, Antoni Sanchez, Xavier Font, Maja Baranska
Summary: The addition of zero-valent iron nanoparticles (nZVI) to semi-continuous anaerobic digestion of sewage sludge has been shown to significantly increase methane content in biogas, with short-term positive effects that are gradually lost over time. Higher doses of nZVI sustained positive effects for longer periods, possibly due to microbiome acclimation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Nan Wang, Yutong Yang, Kunde Xu, Xiangang Long, Yurui Zhang, Hongzhou Liu, Tiezhu Chen, Jianchang Li
Summary: This study investigated the reasons behind the higher methane conversion and lower CO2 emissions in electrochemical anaerobic digestion (EAD) compared to anaerobic digestion (AD). Single-chamber AD and EAD reactors were utilized, with temperature as the variable factor. Various indicators such as current, pH, electrode potential, gas content, and microbial community were analyzed. The results revealed that EAD exhibited improved hydrogen-dependent CO2 reduction pathway and had specific dominant microorganisms, such as Trichloromonas, Oscillibacter, Syntrophomonas, and Methanosaeta.
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)