Article
Ecology
Joachim Audet, Arnaud Jeglot, Lars Elsgaard, Astrid Ledet Maagaard, Sebastian Reinhold Sorensen, Dominik Zak, Carl Christian Hoffmann
Summary: Woodchip bioreactors are effective tools for mitigating nitrogen pollution in agricultural drainage water by utilizing denitrification to remove nitrate nitrogen. However, variations in nitrogen removal efficiency and nitrous oxide emissions are influenced by hydraulic residence time. Overall, the study showed that all bioreactors effectively removed nitrogen and had low nitrous oxide emissions, especially with hydraulic residence times exceeding 60 hours.
ECOLOGICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Yongxiang Yu, Xing Li, Haoxin Fan, Yaying Li, Huaiying Yao
Summary: The presence of microplastics (MPs) in paddy soils enhances the emission of nitrous oxide (N2O) by nitrifiers and denitrifiers. The dose effect of MPs on N2O release was investigated in this study. Low doses of MPs had negligible effects on N2O emissions, while high amounts significantly increased N2O emissions from paddy soils cultivated for different years. A 0.2% concentration of polyethylene (PE) MPs was found to be the threshold for accelerated N2O release. The increase in MP concentrations affected microbial functional genes involved in N2O production and reduction, but microbial taxonomic attributes had an insignificant role in controlling N2O emissions.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Shunxi Zhou, Yue Li, Peiyin Jia, Xin Wang, Fanlong Kong, Zhixiang Jiang
Summary: This study investigates the effects of biochar and manganese ore on N2O and CH4 emissions during sewage sludge composting. The results show that the co-addition of biochar and manganese ore can effectively reduce global warming potential and total nitrogen loss. The main mechanism for reducing N2O emissions is identified as the inhibition of N2O generation during nitrification and denitrification processes. Meanwhile, the reduced CH4 emissions are achieved by inhibiting CH4 generation and promoting CH4 consumption.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Jianhui Sang, M. M. T. Lakshani, T. K. K. Chamindu Deepagoda, Yuying Shen, Yuan Li
Summary: The increased frequency of extreme weather variations worldwide has led to significant changes in soil water content. This study conducted a meta-analysis to explore the responses of soil CO2 and N2O emissions to drying and rewetting cycles (DWCs) at a global scale. The results showed that DWCs increased CO2 emissions, but had no significant effect on N2O emissions. Factors such as soil water-filled pore space during wetting, soil clay content, days of drying and wetting, and frequency of DWCs played a significant role in the emissions. Biotic and abiotic factors, such as carbon substrate availability and microbial activity, were identified as the main drivers of CO2 and N2O emissions, while soil gas diffusion and oxygen availability dominated N2O emissions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Agronomy
Ye Lim Park, Hyun Ho Lee, Sung Un Kim, Namgoo Kang, Chang Oh Hong
Summary: This study investigated the effects of copper, iron, and zinc on N2O emissions and found that copper and iron can reduce N2O emissions per unit area, thus diminishing the environmental burden.
Article
Engineering, Environmental
M. Beier, I Feldkaemper, A. Freyschmidt
Summary: A new approach has been developed to forecast biological N2O formation and emission at high-strength reject water treatment, which was calibrated and evaluated through extensive batch tests and long-term measurement campaigns. The proposed modelling approach has proven to accurately represent the observed trends of N2O formation, emission, and reduction, allowing for a reliable estimation of N2O emissions under different operational conditions.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Sakae Toyoda, Takahito Kakimoto, Kushi Kudo, Naohiro Yoshida, Daisuke Sasano, Naohiro Kosugi, Masao Ishii, Sohiko Kameyama, Mahomi Inagawa, Hisayuki Yoshikawa-Inoue, Shigeto Nishino, Akihiko Murata, Shigeyuki Ishidoya, Shinji Morimoto
Summary: Ocean-atmosphere gas exchange in the Arctic Ocean is sensitive to global warming because the decrease of sea-ice covered area enhances the exchange. The isotopic signatures of dissolved N2O in the Chukchi Sea shelf indicate a mixture of N2O produced in the bottom water and that of atmospheric origin.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Environmental Sciences
Gang He, Xiaoliang Jiang, Lunguang Yao, Guihua Liu, Yuyi Yang, Ying Jiang, Wenzhi Liu
Summary: Tetracycline residues in sediment typically reach their peak on the 5th day before gradually decreasing; while non-therapeutic concentrations of tetracycline seem to have no adverse effects on sediment nitrogen and carbon cycling rates, they may reduce microbial abundance in the short term and promote the proliferation of antibiotic resistance genes in the long term.
Article
Agriculture, Multidisciplinary
Hui-Min Zhang, Zhi Liang, Yong Li, Zhao-Xiong Chen, Jin-Bo Zhang, Zu-Cong Cai, Lars Elsgaard, Yi Cheng, Kees Jan van Groenigen, Diego Abalos
Summary: Liming, a management practice used worldwide to reduce the negative effects of acidification in soils, has been found to have a significant impact on greenhouse gas emissions. This global meta-analysis study shows that liming can reduce nitrous oxide (N2O) emissions by increasing the abundance of N2O reductase genes and decreasing the fungi:bacteria ratio in soil. It also suggests that liming can reduce methane (CH4) emissions and the abundance of methanogens, but has no effect on CH4 uptake and methanotrophs. Additionally, liming increases soil carbon dioxide (CO2) emissions due to higher respiration. The study highlights the importance of considering soil microbial communities in understanding and mitigating greenhouse gas emissions in response to liming.
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
(2022)
Article
Environmental Sciences
Pengzhang Li, Yongzhen Peng, Shuying Wang, Yue Liu
Summary: Using actual domestic wastewater, this study investigated the emission of nitrous oxide (N2O) and its nitrification mechanisms by adding nitrogen compounds to different nitrification processes. It was found that partial nitrification produced more N2O through denitrification compared to full nitrification. The study suggests that full nitrification is beneficial for reducing N2O emissions and provides a control strategy for reducing greenhouse gas production in wastewater treatment processes.
Article
Environmental Sciences
Brienne Nelson, Richard G. Zytner, Yohan Dulac, Alexandre R. Cabral
Summary: The study aimed to design, construct, and monitor a fully instrumented pilot-scale PMOB to reduce fugitive methane emissions from a closed landfill in Kitchener, Ontario, now a public park. Factors considered in the design include type of PMOB media, methane loading rates, hydraulic behavior, and ambient temperature. Methane oxidation efficiencies between 73% and 100% were achieved during the monitoring period. Successful mitigation will provide a low-maintenance, high-impact technology that could be adopted by the municipality for abatement of methane emissions at other landfills under its management.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Yi Wang, Binjuan Li, Furong Xue, Wenhuai Wang, Xiaozhong Huang, Zhen Wang
Summary: This study investigated the performance of a continuous tower biofilter reactor (TBFR) with a large height-to-diameter ratio of 13 in treating landfill leachate. The results showed high removal rates of total nitrogen and chemical oxygen demand, with optimal reaction conditions in different zones along the reactor. The TBFR demonstrated effective treatment of landfill leachate by creating distinct aerobic and anaerobic zones in a single reactor.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
Lu Tian, Lin Wang, Xiaofeng Zhang, Xuda Huang, Fuhao Wang, Sifu Zhu, Xueqiang Li, Ying Guan
Summary: The seasonal variations of biofilm communities in a municipal wastewater treatment plant were investigated using multi-omics techniques. The study found significant differences in the abundance of microorganisms at different phyla between winter and summer samples. The results of metaproteomics and metagenomics showed that Betaproteobacteria class was the most abundant functional microorganism, and the enrichment of Flavobacteria class in winter ensured the stability of denitrification performance. Seasonal variations also affected the proteomic expression profiling and metabolite profile of the biofilm communities.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Zhuwu Jiang, Zhongjian Zheng, Mengfan Wu, Yang Qu, Chaoqun Zheng, Jyunhong Shen
Summary: Currently, the problem of not meeting increasingly strict emission standards in the biological treatment of domestic sewage with high nitrogen and phosphorus stress has become prominent, especially when there is insufficient carbon source. To efficiently treat low-carbon sewage, a full-scale integrated system based on a combination of an up-flow aerated biofilter and a denitrification shallow biofilter (UAB-DSB) was constructed and applied practically. By investigating the effects of different operation parameters, optimal removal efficiencies of COD, NH4+-N, TN, and TP were achieved, resulting in excellent quality effluent.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Edward J. H. van Dijk, Mark C. M. van Loosdrecht, Mario Pronk
Summary: The study found that the average emission factor of nitrous oxides is influenced by factors such as season, temperature, and rainfall, and different process controls may be necessary at different temperatures to ensure consistent low emissions.
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)