Article
Chemistry, Analytical
Alba Romano, Inmaculada Ortiz, Ane M. Urtiaga
Summary: This study presents a comprehensive kinetic analysis and modelling of electrochemically assisted ammonia removal from marine aquaculture waters. The proposed model combines kinetics of chlorine electrogeneration with experimentally determined mechanism and kinetic parameters of break point chlorination reactions. The model has been validated through laboratory experiments, confirming its validity and robustness in analyzing, predicting, and explaining ammonia removal performance in electrochemical treatment of marine RAS water.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Engineering, Environmental
Jiatong Dai, Yongzhen Peng, Jianhua Zhang, Liang Zhang
Summary: The study investigates the feasibility of enhancing anammox enrichment in sewage treatment through fixed biofilm. The results show that the fixed biofilm effectively maintained and enriched the anammox bacteria, benefiting the startup and steady operation of the sewage partial nitrification anammox (PNA) process.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Lisheng Wang, Xiaofeng Kang, Yanchen Liu, Xia Huang
Summary: Stable partial nitrification was achieved in MABR using control strategies based on free ammonia (FA) and free nitrous acid (FNA), with low FA concentrations suppressing nitrite oxidizing bacteria (NOB) and FNA stabilizing partial nitrification by eliminating NOB.
Article
Biotechnology & Applied Microbiology
Shiyang Zhang, Qingbo Zhong, Yinghe Jiang, Meng Li, Shibin Xia
Summary: Temperature variation can significantly affect the purification performance of bioreactors by enhancing nutrient removal and influencing the composition and dominant species of microbial communities. Nitrifiers play a key role in the purification process, closely related to the severe lack of carbon sources in treated wastewater.
Article
Environmental Sciences
Nguyen Hong Dan, Tran Le Luu
Summary: Landfill leachate treatment is crucial, especially in developing countries, and this study found that the CF-SBBR method with different biocarriers effectively removed pollutants. The MB biocarriers showed the highest removal efficiencies for COD, TOC, and NH4+-N, while TN removal efficiency decreased with increasing biocarrier surface area. The study concluded that CF-SBBR is an efficient method for landfill leachate treatment.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Agricultural Engineering
Junhao Su, Qian Zhang, Wansong Huang, Jianyang Song, Haojin Peng, Jiapeng Feng, Jing He, Yunjie Zhang, Hua Wei
Summary: By adding exogenous N-acyl-homoserine lactones (AHLs), this study improved nitrogen removal efficiency in aniline wastewater treatment. High-throughput sequencing results showed that a closer relationship between nitrifiers and denitrifiers in the biofilm contributed to enhanced nitrogen removal.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
S. Santorio, A. Val del Rio, C. L. Amorim, L. Arregui, P. M. L. Castro, A. Mosquera-Corral
Summary: The study evaluated the performance of a Continuous Flow Granular Reactor (CFGR) for treating freshwater RAS stream during two consecutive dry seasons. The configuration with a mechanical stirrer and sieve showed the best results in terms of biomass retention and nitrogen removal, achieving granulation in 55 days with high removal percentages of ammonium and nitrite.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Review
Fisheries
Stefanos Moschos, Konstantinos Ar. Kormas, Hera Karayanni
Summary: This review examines the microbiome of recirculating aquaculture systems, focusing on dominant genera and families and their metabolic functions. It also highlights the lack of information on archaeal and microeukaryotic communities and prokaryotic-protist interactions in these systems.
REVIEWS IN AQUACULTURE
(2022)
Article
Environmental Sciences
Kai Wang, Jinfeng Jiang, Liang Ma, Liwen Zheng, Guangyuan Zhang, Daoji Wu
Summary: In this study, the efficiency of nitrogen removal from pharmaceutical wastewater was improved by treating the wastewater in an ASBR and a modified SBBR. Through the use of SND, deep denitrification of the system was achieved with a shorter running time.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Agricultural Engineering
Yifei Gao, Yihan Li, Lulu Chen, Jing Song, Ying Liu
Summary: The electrooxidation-BAFs were able to efficiently remove ammonia and nitrite in low nutrient seawater in a recirculating aquaculture system, resulting in higher functional bacteria enrichment and improved cultivation effects for Sebastes schlegelii.
BIORESOURCE TECHNOLOGY
(2021)
Article
Energy & Fuels
Daiki Ogasawara Maruyama, Shin-ichi Akizuki, Mutsumi Sekine, Akinori Fujita, Nigus Gabbiye Habtu, Shinjiro Sato, Tatsuki Toda
Summary: The proliferation of water hyacinths is a global issue with significant environmental and social implications. This study evaluates the effectiveness of using biochar carriers derived from local waste biomass, such as coffee husks, for water hyacinth juice treatment. The results show that biochar carriers can significantly improve methane yield and organic carbon removal, providing a potential alternative for local waste treatment.
BIOENERGY RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Xiaoying Chen, Lingjie Liu, Yanmeng Bi, Fansheng Meng, Dong Wang, Chunsheng Qiu, Jingjie Yu, Shaopo Wang
Summary: In this study, a lab-scale anammox sequencing biofilm batch reactor (SBBR) was rapidly recovered within 85 days by gradually increasing the influent nitrogen concentration, achieving a total inorganic nitrogen (TIN) removal efficiency of 83.44 ± 0.03%. During the recovery process, the nitrogen removal rate (NRR) increased from 0.05 to 0.34 kg/(m(3)·d), with the nitrogen loading rate (NLR) changing from 0.08 to 0.40 kg/(m(3)·d) in the anammox system. The activities of hydrazine oxidase (HZO) in the biofilm also increased from 0.17 to 10.80 μmol Cyt-c/(g VSS·s). The dominant anammox genera in the biofilm were Candidatus Kuenenia and Candidatus Brocadia. These results suggest that an SBBR-anammox system with a microbial carrier can enhance the enrichment of anammox bacteria and contribute to performance recovery.
Article
Chemistry, Physical
Arash Badakhsh, Junyoung Cha, Yongha Park, Yu-Jin Lee, Hyangsoo Jeong, Yongmin Kim, Hyuntae Sohn, Suk Woo Nam, Chang Won Yoon, Chan Woo Park, Young Suk Jo
Summary: Ammonia has been proposed as a viable carrier for hydrogen, and an efficient reaction system is needed to maximize usable energy. This study introduces the concept of autothermal recirculating reactor (ARR) and develops BN-coated Cu as a composite reactor material to enhance heat transfer for high-temperature hydrogen release reactions.
JOURNAL OF POWER SOURCES
(2021)
Article
Environmental Sciences
Qintong Li, Ryo Hasezawa, Riho Saito, Kunihiro Okano, Kazuya Shimizu, Motoo Utsumi
Summary: Recirculating aquaculture systems (RAS) play an important role in water quality management and water conservation. This study compared the community structures of micro-ecosystems in RAS systems operated at different temperatures in a marine aquarium. It was found that AOA was the primary nitrifier in the biofilters, and its abundance and diversity were higher in high-temperature samples. NOB showed similar relative abundance patterns to AOA, suggesting a cooperative relationship between the two in the marine RAS system.
Article
Engineering, Environmental
Sekar Vijayakumar, Jingdi Chen, Viswanathan Kalaiselvi, Mani Divya, Zaira Gonzalez-Sanchez, Esteban F. Duran-Lara, Baskaralingam Vaseeharan
Summary: This study successfully synthesized laminarin formulated AuNPs (Lm-AuNPs) using a green method. The Lm-AuNPs exhibited high crystallinity, spherical shape, and an average particle size of 10-80 nm. These nanoparticles also showed good photocatalytic and antibacterial activities, inhibiting the aquatic fish pathogen Aeromonas hydrophila. Additionally, the nanoparticles displayed no significant toxicity or ecotoxicity on aquatic organisms.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Yuanxiang Mao, Huiyu Dong, Shaogang Liu, Liping Zhang, Zhimin Qiang
Article
Engineering, Environmental
Mengkai Li, Mengdi Sun, Huiyu Dong, Jun Zhang, Yingjia Su, Zhimin Qiang
Article
Engineering, Environmental
Jun Hu, Yiran Xu, Ying Chen, Jiang Chen, Huiyu Dong, Jianming Yu, Zhimin Qiang, Jiajia Qu, Jianmeng Chen
Summary: The study showed that lead dioxide (PbO2) can oxidize iodide (I-) to form toxic iodinated DBPs in drinking water pipes, while biofilm extracellular polymeric substances (EPS) are important precursors of DBPs formation. The research also found that EPS proteins have a higher potential for organic iodine formation, resulting in higher toxicity of iodinated DBPs.
Article
Engineering, Environmental
Huiyu Dong, Lei Xu, Yuanxiang Mao, Yan Wang, Shule Duan, Junfeng Lian, Jin Li, Jianwei Yu, Zhimin Qiang
Summary: This study investigated the occurrence and removal of 29 pesticides in 4 drinking water treatment plants in Shanghai, China from 2018 to 2019. Concentration levels of target pesticides in raw waters varied from below the limit of quantification to 915.2ng/L.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Agricultural Engineering
Michiel Van Tendeloo, Yankai Xie, Wannes Van Beeck, Weiqiang Zhu, Sarah Lebeer, Siegfried E. Vlaeminck
Summary: Selective suppression of nitrite oxidizing bacteria (NOB) was achieved in a biofilm-based system through oxygen control and recurrent exposure to free ammonia (FA), offering potential for resource efficient nitrogen removal.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Weiqiang Zhu, Michiel Van Tendeloo, Yankai Xie, Marijn Juliaan Timmer, Lai Peng, Siegfried E. Vlaeminck
Summary: During storage, the activity of AnAOB is affected by temperature and redox adjustment. The anoxic storage condition at 20 degrees Celsius has a greater impact on AnAOB activity, and it is negatively correlated with the electrical conductivity level.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agricultural Engineering
Weiqiang Zhu, Michiel Van Tendeloo, Abbas Alloul, S. E. Vlaeminck
Summary: The strong effect of low temperatures on anammox limits its use in temperate climates during winter. Winter bioaugmentation with stored summer surplus sludge is a potential solution to ensure sufficient nitrogen removal. The study found that the deteriorated nitrogen removal in systems due to temperature decrease could be fully restored by bioaugmentation with stored granules or flocs. Additionally, the reactivation of stored sludges in lower temperature systems resulted in partial activity restoration and the formation of a more specialized bacterial community.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Weiqiang Zhu, Michiel Van Tendeloo, Abbas Alloul, Siegfried E. Vlaeminck
Summary: A return-sludge nursery concept is proposed to enhance anammox activity under sewage treatment conditions. The concept involves blending sludge reject water with mainstream effluent to increase the temperature, N levels, and EC of the anammox nursery reactor. Bioreactor experiments showed that nursery treatment increased nitrogen removal rates during mainstream operation by 33-38%. The increased anammox activity can be partly explained by higher temperatures, elevated EC, higher nitrogen concentrations, and potential synergetic effects.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Huiyu Dong, Ilona D. Nordhorn, Karsten Lamann, Danielle C. Westerman, Hannah K. Liberatore, Alexandria L. B. Forster, Tareq Aziz, Susan D. Richardson
Summary: Iodized table salt can react with chloramine residuals in tap water and organic matter in pasta to form iodinated disinfection byproducts (I-DBPs) during cooking. This study is the first to investigate I-DBP formation from cooking real food with iodized table salt and chloraminated tap water. The method used in this study required sample cleanup, extraction, standard addition calibration, and analysis using gas chromatography-mass spectrometry (GC-MS/MS). Multiple I-DBPs were detected when iodized table salt was used to cook pasta, while no I-DBPs were formed with other types of salt. The formation of I-DBPs poses a potential health hazard, but can be avoided by specific cooking methods.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Jiafu Li, Zengli Zhang, Md. Tareq Aziz, Caroline O. Granger, Zhimin Qiang, Susan D. Richardson, Huiyu Dong
Summary: Due to the high concentrations of disinfection byproducts (DBPs) in drinking water, compared to other emerging environmental contaminants, DBPs have become a global concern. We have developed a simple and sensitive method for simultaneously measuring 9 classes of DBPs. This method overcomes the weaknesses of other methods, particularly for HAAs/IAAs and mono-/di-HALs, and provides a useful tool for studying regulated and unregulated priority DBPs.
ANALYTICAL CHEMISTRY
(2023)
Article
Agricultural Engineering
Weiqiang Zhu, Michiel Van Tendeloo, Jolien De Paepe, Siegfried E. Vlaeminck
Summary: In mainstream partial nitritation/anammox (PN/A) systems, suppressing nitrite oxidizing bacteria (NOB) activity and reducing N2O emissions are crucial goals. This study tested the N2O emissions associated with three NOB suppression strategies in a covered rotating biological contactor (RBC) biofilm system at 21 degrees C: low dissolved oxygen (DO) concentrations, free ammonia (FA) treatments, and free nitrous acids (FNA) treatments. Low DO levels effectively decreased NOB activity and reduced N2O emissions, but NOB adaptation occurred after 200 days. Periodic FA or FNA treatments effectively suppressed NOB, with FA treatment promoting N2O emissions and FNA treatment having no effect. Therefore, operating biofilm PN/A systems at low DO levels with periodic FNA treatment can maximize nitrogen removal efficiency while minimizing greenhouse gas emissions.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Yan Wang, Wenyu Sun, Huiyu Dong, Zhimin Qiang
Summary: The UV/chlorine dioxide (ClO2) process shows potential effectiveness in degrading micro-pollutants. UV irradiation promotes ClO2 decay and the formation of reactive radicals, resulting in a synergistic effect on metribuzin (MET) degradation. Reactive radicals, mainly HO· and reactive chlorine species, contribute to 59%-67% of the total degradation rate of MET during UV/ClO2. Chlorite (ClO2-) and chlorate (ClO3-) formation is a major concern in ClO2 oxidation, with ClO3- being the dominant product during MET degradation by UV/ClO2. Additionally, the formation of organic halogenated disinfection by-products (DBPs) is higher with UV/ClO2 pre-treatment compared to ClO2 pre-treatment.
ENVIRONMENTAL POLLUTION
(2023)
Review
Engineering, Environmental
Huiyu Dong, Md. Tareq Aziz, Susan D. Richardson
Summary: With the increasing occurrences of algal blooms worldwide, the release of algal toxins threatens drinking water resources. Oxidation/disinfection processes have shown promise in removing algal toxins, however, the transformation of these toxins does not guarantee a reduction in toxicity. The formation of toxic transformation products (TPs) should also be considered, especially during chlorination. Further research is necessary to optimize oxidation/disinfection processes for effective reduction of toxicity.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Huiyu Dong, Amy A. A. Cuthbertson, Michael J. J. Plewa, Chad R. R. Weisbrod, Amy M. M. McKenna, Susan D. D. Richardson
Summary: This study aimed to identify the molecular weight fractions and their chemical composition that induce toxicity in chloraminated and chlorinated drinking waters. The <1 kD fraction was found to exhibit the highest levels of cytotoxicity and genotoxicity. High-resolution mass spectrometry identified 3599 chlorine-containing DBPs in this fraction, with CHOCl being the most abundant. Interestingly, more high-molecular-weight CHOCl1-3 DBPs were identified in chloraminated waters. Therefore, the removal of natural organic matter fractions with high O/C ratio and high AI(mod) value should be strengthened to minimize the formation of known and unknown DBPs in drinking water treatment processes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Haoming Wang, Jin Li, Huiyu Dong, Zhimin Qiang
Summary: This study successfully used marine heterotrophic nitrification-aerobic denitrification (MHNAD) bacteria to treat mariculture wastewater, and deciphered the multi-antibiotic (ATS) resistance mechanisms through the co-occurrence patterns of microbiome and resistome. Under an ATS dose of 36 mg/L, MHNAD bacteria exhibited strong antibiotic resistance and achieved high removal efficiencies of organic and nitrogen. This study proposes a novel process for mariculture wastewater treatment.
