Article
Agricultural Engineering
Fengyuan Zhang, Quan Feng, Ying Chen, Xiaoshuang Shi, Kang Qin, Mingyi Lu, Fan Qin, Shanfei Fu, Rongbo Guo
Summary: Magnetic microparticles can promote nitrification and denitrification in wastewater treatment, facilitate EPS production, and act as a pH buffer in aerobic conditions, thus enhancing nitrogen removal efficiency.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Xiaolin Zhou, Xuejun Bi, Tang Yang, Xing Fan, Xueqing Shi, Ling Wang, Yuan Zhang, Lihua Cheng, Fangchao Zhao, Zakhar Maletskyi, Xiaoliang Hui
Summary: This study analyzed the biofilms of a two-stage A/O-MBBR system using metagenomic sequencing, and found significant differences in microbial populations among different chambers. Ammonia nitrogen removal was positively correlated with Nitrospira and Nitrosomonas, while denitrification was positively correlated with denitrifying genera. Functional biofilms with different microbial nitrogen metabolisms were formed in each chamber.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Elin Ossiansson, Simon Bengtsson, Frank Persson, Michael Cimbritz, David J. I. Gustavsson
Summary: Primary filtration is an effective pre-treatment process for municipal wastewater, characterized by high removal of suspended solids. By combining with rotating belt filter and fermentation, volatile fatty acids can be produced as carbon source for biological nutrient removal. The process efficiently removes particles larger than 10 micrometers and has a strong linear correlation with the influent suspended solids concentration. Fermentation of sludge at ambient temperature and addition to wastewater significantly increases VFA concentration.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
A. Pascual, J. A. Alvarez, D. de la Varga, C. A. Arias, D. Van Oirschot, R. Kilian, M. Soto
Summary: The influence of bed depth on the performance of aerated horizontal constructed wetlands was investigated at the pilot plant scale. The results showed that a larger bed depth and artificial aeration can improve the loading rate and the removal efficiency of organic matter and nitrogen in the horizontal constructed wetlands.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Agricultural Engineering
Luyuan Zhang, Qiong Zhang, Xiyao Li, Tong Jia, Shuying Wang, Yongzhen Peng
Summary: This study established a novel combined process of anaerobic ammonia oxidation using a sequencing batch reactor and up-flow sludge beds, achieving efficient nitrogen removal from municipal wastewater.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Saurabh Mishra, Virender Singh, Liu Cheng, Abid Hussain, Banu Ormeci
Summary: The present study provides a comprehensive review of biological nitrogen removal (BNR) technologies, including both conventional and emerging methods. The study covers mechanisms, operational parameters, efficacies, and process control strategies, as well as recent developments, challenges, and ongoing research trends. Additionally, the economic aspects of BNR processes are evaluated to assess their feasibility in wastewater treatment plants of different capacities.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Review
Biotechnology & Applied Microbiology
Yun Xing, Willie F. Harper
Summary: The increasing presence of engineered nanoparticles (ENPs) in consumer products has raised concerns about the potential negative impacts on nitrification in wastewater treatment plants (WWTPs). Studies have shown that ENPs can inhibit the activities of ammonia-oxidizing bacteria (AOBs) and nitrite-oxidizing bacteria (NOBs), leading to significant deterioration when influent concentrations exceed a certain threshold. Proposed mechanisms include the generation of reactive oxygen species, dissolved metals, physical disruption of cell membranes, bacterial engulfment, and intracellular accumulation of ENPs.
BIOTECHNOLOGY AND BIOENGINEERING
(2021)
Review
Chemistry, Multidisciplinary
Ncumisa Mpongwana, Sudesh Rathilal
Summary: This review explores the properties of biofilms that can be exploited to enhance biological wastewater systems. It reveals that various biofilm properties, such as extracellular polymeric substances (EPS), quorum sensing (Qs), and acylated homoserine lactones (AHLs), can be enhanced to improve biofilm technology for wastewater treatment processes. The review also emphasizes the importance of exploiting these properties in simultaneous nitrification and denitrification and biological phosphorus removal processes.
APPLIED SCIENCES-BASEL
(2022)
Article
Green & Sustainable Science & Technology
Pascal Ochs, Ben Martin, Eve Germain-Cripps, Tom Stephenson, Mark van Loosdrecht, Ana Soares
Summary: Over the past twenty years, various commercial technologies have been deployed to remove ammonia from anaerobic digestion liquors. This study provides a comparative techno-economic assessment of sidestream technologies to remove ammonia from conventional AD and THP/AD dewatering liquors. The study identified that deammonification is a capable and cost-effective nitrogen removal technology.
ENVIRONMENTAL SCIENCE AND ECOTECHNOLOGY
(2023)
Article
Engineering, Environmental
Xueping Tian, Jingtao Zhao, Jun Huang, Guoke Chen, Yonggui Zhao
Summary: The metabolic process of aerobic granular sludge (AGS) treating piggery wastewater with high concentrations of carbon and nitrogen was elucidated through a combined analysis of microbial community, denitrification genes, and mathematical model calculations. The dominant microorganisms in AGS had potentials of various metabolic activities, with aerobic denitrification process being dominant. The study also revealed the resistance of rapid organic substrates storage in AGS during feast phase against high strength wastewater, providing carbon and energy sources in the famine phase.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Harish Ravishankar, Andras Nemeth, Gerard Massons, David Puig, David Zardoya, Natalia Carpi, Piet N. L. Lens, Barry Heffernan
Summary: Simultaneous nitrification and denitrification was achieved in an MABR system treating municipal sewage. The availability of soluble biodegradable COD and the ratio of oxygen supply to demand were found to be critical factors for effective denitrification.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Tanya Valkova, Vanessa Parravicini, Ernis Saracevic, Joseph Tauber, Karl Svardal, Jorg Krampe
Summary: N2O emissions in activated sludge tanks are mainly influenced by the activity of nitrifying bacteria and the efficiency of heterotrophic denitrification. Low-loaded plants achieving high nitrogen removal exhibit lower N2O emission intensity. The regression analysis shows a negative linear correlation between the N2O emission factor and the total nitrogen removal degree of the plants.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Runfeng Liao, Zi Song, Jianjun Zhang, Dingyu Xing, Sibo Yan, Wenyi Dong, Feiyun Sun
Summary: This study successfully developed a pilot-scale integrated system with physicochemical pretreatment, anaerobic sequencing batch reactor, partial nitrification SBR, denitrification SBR, and UV/O3 advanced oxidation process to treat mechanical dewatering wastewater (MDW) containing high organics and nitrogenous content. The system achieved removal efficiencies of 99.7% COD, 98.2% NH4+-N, and 96.9% total nitrogen (TN) in the MDW, and the final effluent met the discharge standard.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Birthe K. Stricker, Dana A. Tamim, Dorothea Rechtenbach, Joachim Behrendt, Ralf Otterpohl
Summary: This study investigated the biological treatment of nanofiltration effluent under different conditions to eliminate micropollutants. The results showed that gabapentin, iomeprol, and metoprolol had high elimination rates under both aerobic and nitrate-denitrifying conditions, while diclofenac had a higher elimination rate with longer hydraulic retention time. The elimination of sulfamethoxazole was influenced by the treatment condition.
WATER ENVIRONMENT RESEARCH
(2023)
Article
Environmental Sciences
Hong Chen, Zhi Tu, Sha Wu, Guanlong Yu, Chunyan Du, Hong Wang, Enzhe Yang, Lu Zhou, Bin Deng, Dongbo Wang, Hailong Li
Summary: The novel process of partial denitrification (PD) coupled with anaerobic ammonium oxidation (AMX) shows great potential for nitrogen removal in municipal wastewater treatment. Research focuses on process mechanisms, microbial community characteristics, key operational parameters, stable operation, and control methods. Challenges lie in engineering and economic feasibility, full mainstream AMX application, and further study of PD-AMX mechanism optimization for better engineering practice.
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)