Article
Agricultural Engineering
Yunmeng Pang, Jianlong Wang
Summary: The presence of Fe2+ significantly affects the performance of sulfur-driven autotrophic denitrification, with higher concentrations leading to inhibition of denitrification and accumulation of nitrite and nitrous oxide. The abundance of Thiobacillus is positively correlated with nitrate removal rate, but negatively correlated with Fe2+ concentration. Fe2+ also influences the abundance of bacterial 16S rRNA, denitrifying genes, and sulfur-oxidizing genes, particularly nosZ and soxB, which have the most sensitivity to Fe2+.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Xiao Huang, Chongsen Duan, Jianghua Yu, Wenyi Dong
Summary: The research found that the transformation process can effectively reduce nitrate nitrogen discharge concentration, but there may be nitrite nitrogen accumulation in the initial stages. Three dominant denitrification genera were identified, with heterotrophic denitrification showing more complex microbial interspecific interactions.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Haishuang Wang, Nan Chen, Chuanping Feng, Yang Deng
Summary: The coexistence of nitrate and V(V) in groundwater poses potential threats to the environment and public health. For the first time, it has been shown that denitrification and V(V) bio-reduction can occur simultaneously using corn straw as the carbon and energy source. Corn straw has been proven to be efficient in denitrification and V(V) bio-reduction in various environments.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agricultural Engineering
Jun Xie, Jie Gu, Xiaojuan Wang, Ting Hu, Wei Sun, Zilin Song, Kaiyu Zhang, Liusheng Lei, Jia Wang, Yifan Sun
Summary: This study aimed to investigate the impact of adding different proportions of woody peat (WP) on denitrification during composting. The results showed that adding 5% and 15% WP increased the total nitrogen content and reduced the nitrate nitrogen content. The abundances of denitrification genes and denitrifying bacteria were also decreased with the addition of WP.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Shaohong Zheng, Xiangyin Liu, Xiangjing Yang, Hongen Zhou, Jin Fang, Siyuan Gong, Junfeng Yang, Jiannv Chen, Tiansheng Lu, Ming Zeng, Yujie Qin
Summary: By changing the molar ratio of influent C/N/S, this study explored the denitrification performance and microbial community in mixotrophic denitrification systems. The results showed that the joint action of several genera, including Thauera, Pacacoccus, Fusibacter Pseudoxanthomonas, Thiobacillus, Sulfurovum, and Sulfurimonas, contributed to efficient denitrification. The relative abundances of Thauera, Thiobacillus, and Sulfurimonas increased after the addition of S2-, indicating a potential mechanism for improving denitrification performance in mixotrophic systems.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Junfeng Yang, Yujie Qin, Xiangyin Liu, Lan Yang, Shaohong Zheng, Siyuan Gong, Zhiju Liu, Chenglong Wu, Xinyue Lin, Tiansheng Lu, Jiannv Chen
Summary: In this study, the effects of different electron donors on the nitrogen removal performance and microbial characteristics of a denitrification system were investigated. The addition of glucose led to advanced nitrogen removal and a potential interaction model between sulfur autotrophic and heterotrophic bacteria.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Agricultural Engineering
Zhou Chen, Shenghua Zhang, Yanzeng Li, Yuantao Wang
Summary: This study investigated the effects of co-composting kitchen waste (KW) and garden waste (GW) at different ratios on denitrifying activities, functional genes, and community composition of denitrifiers. The results showed that the denitrification activity was the lowest at a 1:2 ratio. Gene abundances of nirS, nirK, nosZI, and nosZII were high on days 12 and 28 under all ratios. Network analysis revealed that nosZ-type denitrifiers could form a complex bacterial network to promote N2O reduction. Mantel test results indicated significant positive correlations between nirS, nirK, nosZI, nosZII-type denitrifiers and pH, C/N, and moisture content. These findings highlight the potential of composting KW and GW in reducing N2O emissions.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Shuting Tang, Yin Rao, Shulian Huang, Yue Xu, Kaiyue Zeng, Xin Liang, Qiujie Ling, Kehui Liu, Jiangming Ma, Fangming Yu, Yi Li
Summary: This study investigated the abundance, diversity, and community composition of AOA, AOB, nirS, nirK, and nosZ genes in the soil profiles of different ecologically degraded areas in the Siding mine. The results showed that heavy metal contents had a significant impact on the abundance of AOA amoA, nirS, and nirK genes. AOA amoA played a major role in ammonia oxidation and was adapted to heavy metal-contaminated environments. Furthermore, soil organic matter content and C/N ratio influenced the diversity and structure of AOA and AOB communities.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Fen Wang, Jing Li, Hongli Duan
Summary: A lab-scale sulfur-limestone based bioretention system with a submerged zone was used to remove nitrate-nitrogen from stormwater. The study found that denitrification mainly occurred during the first 5 days of drying period. The system effectively removed nitrate-nitrogen and met the Chinese Quality Standard for Ground Water when the influent concentration was below 30 mg/L. The sulfur autotrophic denitrification process followed a first-order kinetic model, and the dominant bacteria in the submerged zone were Thiobacillus and Halothiobacillus.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Shuting Tang, Yin Rao, Shulian Huang, Yue Xu, Kaiyue Zeng, Xin Liang, Qiujie Ling, Kehui Liu, Jiangming Ma, Fangming Yu, Yi Li
Summary: This study investigated the abundance, diversity and community composition of ammonia oxidizers and denitrifiers in the soil profiles of severely ecologically degraded areas. The results showed that heavy metal contents and soil organic matter had strong impacts on the abundance and diversity of these microbes, while the soil C/N ratio, soil available phosphorus content and soil moisture affected the processes of nitrification and denitrification.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Xun-yu Shen, Yang-yang Zhuge, Yong-di Liu, James P. Shapleigh, Wei Li
Summary: Long-term exposure to high concentrations of acetylene can lead to high N2O production during nitrite denitrification. The microbial community shifted towards domination by Saprospiraceae and nosZII-harboring bacteria under these conditions. Removal of acetylene resulted in rapid restoration of N2O reduction.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Haishuang Wang, Nan Chen, Chuanping Feng, Yang Deng, Wang Lu
Summary: In this study, it was found that microorganisms may be the driving force to distinguish vanadium release and reduction processes in a complex contaminated system with a liquid carbon source. Experiments were conducted to observe the variation of nitrate and V(v) under anaerobic conditions with different liquid carbon sources. The results showed that certain microbial genera were associated with the release and reduction of V(v), providing a potential bioremediation strategy for nitrate and V(v) co-contaminated environments.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Dewei Zhang, Luowen Cheng, Shihua Zhang, Jun Zheng
Summary: This study investigated the denitrification performance of SADF in different low-temperature ranges and analyzed the nitrogen removal contribution along the filter cells. The results showed that the TNRE of the bioreactor decreased as the temperature decreased, but low-temperature acclimation helped to alleviate the inhibition. The bottom-filter layer had the highest nitrogen removal contribution, followed by the middle-filter layer, while the upper-filter layer had the least contribution. The presence of Sulfurimonas was also identified in addition to Thiobacillus, indicating their role in nitrogen removal.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Wei Guo, Xianbin Ying, Nannan Zhao, Shengsong Yu, Xu Zhang, Huajun Feng, Yifeng Zhang, Hanqing Yu
Summary: Groundwater nitrate pollution is a severe environmental problem worldwide. Autotrophic denitrification on polarized electrodes, using biofilms consisting of symbiotic growth of Geobacter and denitrifying bacteria, has shown a significantly higher nitrogen removal rate compared to traditional methods. The excellent performance of the biofilms is attributed to the electron transfer ability between Geobacter and denitrifying bacteria, which was verified by suppressing current generation and denitrification through inhibitors. This study reveals a new extracellular electron transfer mechanism and offers insights into the development of efficient biocathodes for treating nitrate pollution in groundwater.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Zhaozhao Wang, Shuhao Zhu, Simin Li, Jun Ma, Jing Zhang, Peng Gao, Lina Yan
Summary: A comparative study showed that particle size affects nitrate removal efficiency and microbial community composition. Granules with a particle size of 1.0-1.5 mm exhibited superior structural stability and denitrification capacity.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
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)