Article
Agricultural Engineering
Fei Han, Chuanfu Zhao, Wenchao Zhang, Tong Jiao, Zixuan Zhang, Weizhi Zhou
Summary: The concentrations and proportions of chlorine (Cl-) and sulfate ions (SO42-) in high salinity wastewater fluctuate significantly due to diverse sources. This study compared the response of halophilic autotrophic nitrification (AN) and heterotrophic ammonia assimilation (HAA) sludges to changes in salt composition. The results showed that both the AN and HAA systems maintained high ammonia removal efficiency even under mixed salt ion or pure sulfate conditions. Increasing the concentration of SO42- led to an increase in extracellular polymeric substances content, sludge settleability, sludge hydrophobicity, and the relative abundance of Nitrosomonas in the AN system (from 2.3% to 10.4%). The dominant heterotrophic bacteria in the HAA system underwent turnover in response to changes in salt composition conditions. The HAA system demonstrated greater robustness and microbial cooperation compared to the AN system. This study provides a scientific foundation for treating multi-ion high salinity wastewater.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Xin Zou, Mengjiao Gao, Abdul Mohammed, Yang Liu
Summary: The role of different ammonia concentrations in an aerobic granular sludge reactor was investigated, focusing on nitrogen metabolic pathways, microbial community, and specific microbial activity. Heterotrophic ammonia oxidizing bacteria (HAOB) had higher ammonia oxidation rates (AORs) than autotrophic ammonia oxidizing bacteria (AAOB) under certain conditions. The study proposed that the inhibition of heterotrophic bacteria by free ammonia (FA) may contribute to the development of the autotrophic ammonia oxidation pathway and enrichment of AAOB.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
N. B. Karthik, K. C. Bal Krishna, Arumugam Sathasivan
Summary: The study comprehensively evaluated the strategies of rechlorination and rechloramination for recovering and stabilizing chloramine from nitrification. It was found that rechloramination outperformed rechlorination in maintaining a higher chloramine concentration. Despite initial microbial kill-off, microbes regrew to some extent in all samples after the shock treatment.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Civil
Daniel B. Scott, Michele I. Van Dyke, William B. Anderson, Patrick W. King, Peter M. Huck
Summary: The study investigated the microbial contribution to disinfectant decay in drinking water distribution systems using a batch test procedure. A modified method for determining the critical threshold residual (CTR) was developed, which can more easily be applied to distribution system scenarios. Four types of decay curves were identified, which could distinguish differences in the microbial contribution to disinfectant residual decay.
AQUA-WATER INFRASTRUCTURE ECOSYSTEMS AND SOCIETY
(2021)
Article
Environmental Sciences
Ananya Ashok, Susana Agusti
Summary: Oligotrophic areas in the oceans are important, but little is known about the sensitivity of microbial communities to pollutants in such areas. This study found that when exposed to polycyclic aromatic hydrocarbons (PAHs), some microbial populations in the oligotrophic Red Sea decreased, and chlorophyll-a levels also decreased substantially. However, certain bacteria and Synechococcus sp. showed high tolerance, indicating adaptation to chronic pollution.
Review
Environmental Sciences
Sharif Hossain, Christopher W. K. Chow, David Cook, Emma Sawade, Guna A. Hewa
Summary: Nitrification is a significant challenge in chloraminated drinking water systems, leading to the loss of disinfectant residual and adverse effects on water quality. Monitoring and controlling nitrification require microbiological tests or assessment of surrogate parameters. Strategies to manage nitrification include controlling factors that affect monochloramine decay and ammonium substrate availability, but these strategies may increase disinfection-by-products levels.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Environmental Sciences
Xiaocao Miao, Xiaohui Bai
Summary: The study indicates that ammonia oxidation is the dominant driver of increased biomass in SWSS, with ammonia-oxidizing bacteria being the main nitrifying bacteria and incomplete nitrification products promoting the growth of heterotrophic bacteria.
ENVIRONMENTAL RESEARCH
(2021)
Article
Soil Science
Nadine Loick, Elizabeth Dixon, G. Peter Matthews, Christoph Mueller, Veronica S. Ciganda, Maria Lopez-Aizpun, Miguel A. Repullo, Laura M. Cardenas
Summary: This study quantifies the production and consumption pathways of N2O in soil using labelled substrate-N, showing the impact of different water filled pore space on N-transformation processes and emissions. The research highlights the importance of heterotrophic nitrification and denitrification in the N2O emissions, demonstrating the complex relationship between water filled pore space and nitrogen transformations.
Article
Environmental Sciences
Wenshuo Yang, Liang Xu, Junfeng Su, Zhao Wang, Lingfei Zhang
Summary: In recent years, addressing nitrogen and phosphorus pollution in domestic wastewater has become urgent. This study focused on the use of Pseudomonas sp. Y1 as the target strain, which was immobilized using polyvinyl alcohol (PVA) matrix coupled with bentonite and lanthanum (La) to construct bioreactors. The optimal operating parameters, dephosphorization mechanism, and effects of hydrogel materials and different loads on bioreactor performance were analyzed. The study found that specific conditions resulted in the highest removal efficiencies of calcium, phosphate, and ammonium. The addition of bentonite promoted nitrification and denitrification, while the presence of La enhanced dephosphorization. High-throughput sequencing revealed the dominant presence of Pseudomonas in the bioreactor, and the expression of nitrogen removal-related functional genes was favored under specific conditions. This study highlights the superiority of microbial induced calcium precipitation (MICP) combined with PVA hydrogel and provides insights into simultaneous nitrogen and phosphate removal from wastewater.
Review
Biotechnology & Applied Microbiology
Aakanksha Rampuria, Niha Mohan Kulshreshtha, AkhilendraBhushan Gupta, Urmila Brighu
Summary: Traditional nitrogen transformation processes in constructed wetlands involve aerobic nitrification and anoxic denitrification, but recent research has discovered novel pathways like anaerobic ammonium oxidation, heterotrophic nitrification, and aerobic denitrification, which can be enhanced by enriching specialized bacteria through selection pressures. Understanding these novel pathways and associated microbial populations can provide new insights for designing constructed wetlands for enhanced nitrogen removal.
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
(2021)
Article
Agronomy
Tinatin Doolotkeldieva, Saikal Bobusheva
Summary: Analysis of Kyrgyzstan's vegetable seeds revealed various fungal and bacterial species, and a beneficial strain for seed coating was selected.
SEED SCIENCE AND TECHNOLOGY
(2022)
Article
Agronomy
Wei Zhang, Yan Ma, Xuan Yang, Xiuchun Xu, Bang Ni, Rui Liu, Fanqiao Meng
Summary: This study investigates the effects of the nitrogen stabilizers DMPP and NBPT on soil microbial communities. The results show that long-term application of DMPP and NBPT can reduce nitrous oxide emissions, and DMPP can decrease the diversity of ammonia oxidizers. Long-term urea application increases the potential nitrification rate of ammonia oxidizers, while DMPP weakens this effect.
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)
Review
Engineering, Environmental
Xiaonan Luo, Tong Shen, Chaoting Guan, Ning Li, Jin Jiang
Summary: This review summarizes the performance of biological ammonia removal in drinking water treatment and the role of microbes. The potential response of different ammonia-oxidizing microbes to environmental parameters has been revealed, indicating the mechanisms of maintaining biological ammonia removal stability.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Ziang Su, Junting Zhao, Zheng Lu, Mengdan Wang, Congcong Guo, Xue Song, Xuebai Guo, Ming Cai, Zhenjun Wu
Summary: This study investigated the effects of different temperature conditions on nitritation denitrification. The results showed that stepwise cooling facilitated a faster start-up of the process and achieved higher nitrite accumulation compared to continuous low temperature conditions. Additionally, lower temperatures significantly inhibited denitrification activity.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Tharanga N. Weerasinghe Mohottige, Anna H. Kaksonen, Ka Yu Cheng, Ranjan Sarukkalige, Maneesha P. Ginige
JOURNAL OF CLEANER PRODUCTION
(2019)
Article
Green & Sustainable Science & Technology
Upeka Kuruppu, Ataur Rahman, Arumugam Sathasivan
JOURNAL OF CLEANER PRODUCTION
(2019)
Article
Environmental Sciences
Dileepa Rathnayake, Arumugam Sathasivan, George Kastl, Bal K. C. Krishna
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Environmental Sciences
Bhagya S. Herath, Arumugam Sathasivan
Article
Biotechnology & Applied Microbiology
K. C. Bal Krishna, Arumugam Sathasivan, Peter Cox, Corinna Doolan
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2020)
Article
Engineering, Environmental
Arumugam Sathasivan, George Kastl, Shashika Korotta-Gamage, Varuni Gunasekera
Article
Engineering, Environmental
K. C. Bal Krishna, Arumugam Sathasivan, Maneesha P. Ginige
Summary: This study identified 31 putative pathogenic bacteria in laboratory and full-scale chloraminated water distribution systems, with Mycolicibacterium fortuitum and Pseudomonas aeruginosa being the predominant species. The study highlights the diverse abundance of pathogenic bacteria resilient towards chloramine and suggests that metagenomics surveillance of drinking water can serve as a rapid assessment and an early warning of outbreaks.
Article
Engineering, Environmental
Rebecca A. Li, James A. McDonald, Arumugam Sathasivan, Stuart J. Khan
Summary: This study evaluates the application of Bayesian Network models to predict trihalomethanes concentration in drinking water distribution systems, using various water quality parameters. The best-performing models were selected and found to have high predictive accuracies for Sydney and South East Queensland. The developed modeling procedure can now be applied to develop system-specific Bayesian network models for trihalomethanes prediction in other drinking water distribution systems.
Article
Engineering, Environmental
Shashika Madushi Korotta-Gamage, Arumugam Sathasivan, K. C. Bal Krishna
Summary: The study shows that biological activated carbon can improve chlorine stability in drinking water, but dissolved organic carbon is not a good indicator. Combining BAC with enhanced coagulation can effectively enhance chlorine stability, especially in removing chlorine reactive agents.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Su Yan, Ka Yu Cheng, Maneesha P. Ginige, Guanyu Zheng, Lixiang Zhou, Anna H. Kaksonen
Summary: By implementing an online ethanol dosing strategy based on feedback control of oxidation-reduction potential (ORP), this study optimized the performance of a lab-scale fluidized bed reactor (FBR) in treating selenate and nitrate in wastewater. The results showed that complete removal of nitrate and selenate was achieved within specific ORP ranges, with excessive ethanol dosing leading to the production of harmful substances. A optimal ORP of -400 mV was identified for the FBR, resulting in near complete removal of selenate and nitrate with minimal ethanol consumption.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Proceedings Paper
Energy & Fuels
N. B. Karthik, Bal K. C. Krishna, Arumugam Sathasivan
2019 INTERNATIONAL CONFERENCE ON ENVIRONMENT, RESOURCES AND ENERGY ENGINEERING
(2020)
Article
Green & Sustainable Science & Technology
K. C. Bal Krishna, Arumugam Sathasivan, Andrzej Listowski
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Environmental Sciences
Shaokun Song, Ka Yu Cheng, Danny Rhoding, Beatrice Yong, Anas Ghadouani, Maneesha P. Ginige
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Environmental Sciences
Reyad Roy, Arumugam Sathasivan, George Kastl
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Engineering, Environmental
Andres F. Torres-Franco, Deborah Leroy-Freitas, Cristina Martinez-Fraile, Elisa Rodriguez, Pedro A. Garcia-Encina, Raul Munoz
Summary: Anaerobic and microalgae-based technologies have emerged as sustainable alternatives for municipal wastewater treatment. However, the presence of viruses in the treated wastewater is a major concern for reuse applications. This study assessed the ability of these technologies to reduce viruses during secondary wastewater treatment. The results showed that all technologies were effective in reducing the concentration of viruses, with microalgae-based treatment exhibiting the highest potential for reducing the disinfection requirements of treated wastewater.
Article
Engineering, Environmental
Young Gwang Kim, Sae Yun Kwon, Spencer J. Washburn, Scott C. Brooks, Ji Won Yoon, Lucien Besnard
Summary: The study uses Hg isotope ratios to identify the sources and exposure pathways of mercury in bivalves, finding that dissolved Hg phases in the water column are the primary source and exposure pathway to bivalves. This provides new insights into using bivalves as bioindicators for sediment quality monitoring.
Article
Engineering, Environmental
Hui Geng, Ying Xu, Rui Liu, Dianhai Yang, Xiaohu Dai
Summary: This study investigates the effect of cation exchange resin (CER) on the sequential recovery of hydrogen and methane from anaerobic digestion (AD) and the corresponding mechanisms. The results show that CER can simultaneously enhance the production of hydrogen and methane by promoting the solubilisation, hydrolysis, and acidification of organic matter. Additionally, CER facilitates effective contact between bacteria and organic particulates and reduces the energy barrier for mass transfer during methane production. The study also reveals changes in the microbial community structure and metagenomics during the AD process.
Article
Engineering, Environmental
Xiaojing Lin, Zhan Jin, Shunfeng Jiang, Zhiquan Wang, Suqing Wu, Ke Bei, Min Zhao, Xiangyong Zheng
Summary: Dehumidification combined with addition of absorbent resin supplement (ARS) was used to achieve rapid evaporation of non-pretreated urine, resulting in high water evaporation efficiency and nutrient recovery.
Article
Engineering, Environmental
Yangli Che, Chaoran Lin, Shen Li, Jiao Liu, Longhai Zhu, Shilei Yu, Nan Wang, Haoshuai Li, Mutai Bao, Yang Zhou, Tonghao Si, Rui Bao
Summary: Hydrodynamic processes play a crucial role in the transmission of sediments, microbial assembly, and organic carbon redistribution in the ocean. Through experiments and analysis, we found that hydrodynamics shape the assembly of microbial communities and control the redistribution of different sourced organic carbon, thereby influencing microbial-mediated biogeochemical transformation.
Article
Engineering, Environmental
Chao Chen, Yu Yang, Nigel J. D. Graham, Zhenyu Li, Xingtao Yang, Zhining Wang, Nadia Farhat, Johannes S. Vrouwenvelder, Li -an Hou
Summary: The fouling of seawater reverse osmosis membranes is a persistent challenge in desalination. This study monitored the operational performance of a desalination plant for 7 years and the fouling development in different areas of membrane modules. The findings showed that operational performance declined over time and fouling mainly occurred at the feed side of the modules, with the highest microbial diversity. Keystone species like Chloroflexi and Planctomycetes played an important role in maintaining community structure and biofilm maturation. Polysaccharides, soluble microbial products, marine humic acid-like substances, and inorganic substances contributed to fouling. Overall, biofouling had a significant impact on membrane fouling after 7 years of operation.
Article
Engineering, Environmental
Dan Li, Jieyi Sun, Yibo Fu, Wentao Hong, Heli Wang, Qian Yang, Junhong Wu, Sen Yang, Jianhui Xu, Yunfei Zhang, Yirong Deng, Yin Zhong, Ping'an Peng
Summary: Sulfidation-oxidation treatment of magnetite (Fe3O4) enhances the production of dark center dot OH, which can efficiently degrade dissolved organic matter (DOM) and accelerate carbon cycling.
Article
Engineering, Environmental
Cheng Yu, Kaijun Wang, Kaiyuan Zhang, Ruiyang Liu, Pingping Zheng
Summary: This study implemented a microaerobic-aerobic configuration in a full-scale municipal wastewater treatment facility and investigated the effects on sludge characteristics, pollutant removal, microbial community, and granulation mechanisms. The results showed successful transition from flocculent-activated sludge to well-defined AGS after two months of operation. The primary pathways for pollutant removal were simultaneous nitrification, denitrification, and phosphorus removal. Moreover, the incorporation of internal separators induced shifts in the flow pattern, which promoted granulation.
Article
Engineering, Environmental
Zhe Zhang, Shaoyang Hu, Guangrong Sun, Wei Wang
Summary: Halogenated aromatic disinfection byproducts (DBPs), such as halogenated phenols, have garnered widespread attention due to their high toxicity and prevalence. This study reports on the analysis, occurrence, and cytotoxicity of a group of emerging halogenated aromatic DBPs, known as halogenated polyhydroxyphenols (HPPs), in drinking water.
Article
Engineering, Environmental
Shengyue Chen, Jinliang Huang, Peng Wang, Xi Tang, Zhenyu Zhang
Summary: Accurate prediction of river water quality is crucial for sustainable water management. This study introduces wavelet analysis and transfer learning techniques to assist LSTM modeling, proposing a newly coupled modeling approach that improves short-term prediction of river water quality.
Article
Engineering, Environmental
Bang Du, Xinmin Zhan, Piet N. L. Lens, Yifeng Zhang, Guangxue Wu
Summary: Efficient anaerobic digestion relies on the cooperation of different microorganisms with different metabolic pathways. This study investigated the effects of different operational modes and the addition of powdered activated carbon (PAC) on ethanol metabolic pathways. The results showed that the SBR mode and the presence of CO2 facilitated ethanol metabolism towards propionate production, while the CFR mode with extended solids retention time enriched Geobacter. Adjusting operational modes and PAC addition can modulate anaerobic ethanol metabolism and enrich Geobacter.
Article
Engineering, Environmental
Wanfa Wang, Si-Liang Li, Jun Zhong, Yuanbi Yi, Fujun Yue, Zenglei Han, Qixin Wu, Ding He, Cong-Qiang Liu
Summary: This study compares the carbon biogeochemical processes in karst and non-karst regions within large thermal stratified river-reservoir systems. The results demonstrate that karst reservoirs have a reduced potential for carbon emissions and highlight the importance of considering geologic settings to improve accuracy in regional and global CO2 emission estimates.
Article
Engineering, Environmental
Chunxia Jiang, Zelong Zhao, Dong Zhu, Xiong Pan, Yuyi Yang
Summary: This study analyzed the occurrence and distribution of antibiotic resistance genes (ARGs) in different environmental media of the Yangtze River using metagenomics. Core resistome dominated by multidrug resistance genes was found in all samples, while rare resistome dominated by various resistance genes was more prevalent in plasmids. Specific bacteria were identified as hosts for both core and rare resistomes, with high clinical concern ARGs found in the rare resistome. Particle-associated environment provided the most ideal conditions for resistome hosts. This study provided insights into the genetic locations of ARGs and the community assembly mechanisms of ARG hosts in freshwater environments.
Article
Engineering, Environmental
Yu Zhang, Yongtao He, Linchun Jia, Lei Xu, Zheng Wang, Yueling He, Ling Xiong, Xumeng Lin, Hong Chen, Gang Xue
Summary: By synergizing organic carbon source, thiosulfate, and zero-valent iron, efficient mixotrophic denitrification of oligotrophic secondary effluent can be achieved. Thiosulfate plays a vital role in promoting TN removal efficiency, while corrosion of Fe0 releases OH- to neutralize H+ from thiosulfate-driven denitrification, creating a suitable environment for denitrification. The coordination of thiosulfate and Fe0 maintains the dominance of Thiobacillus for denitrification.