Article
Environmental Sciences
Parin Izadi, Parnian Izadi, Ahmed Eldyasti
Summary: Three innovative mathematical models were established to assess the volumetric nitrogen conversion rates of a lab-scale ANAMMOX upflow anaerobic sludge blanket reactor. The models were calibrated and validated using BioWin (R), with Model III showing precise prognosis of effluent data. This study confirms the reliability of ANAMMOX-based process modeling and high predictive ability using BioWin (R).
Article
Engineering, Environmental
Chongjun Chen, Ying Jiang, Xinyi Zou, Menglei Guo, He Liu, Minhua Cui, Tian C. Zhang
Summary: This study investigated how particle size affects the physicochemical characteristics, nitrogen conversion activity, and microbial community in anammox sludge granules. The results showed that larger particle sizes correlated with higher wet density, settling velocity, and removal efficiency of ammonium and nitrite. High-throughput sequencing revealed that microbial richness and diversity decreased and then increased with increasing particle size. Granular sludge with a particle size of 1.0-1.5 mm had the largest EPS content and PN/PS ratio. To maintain high nitrogen removal performance, particle sizes of 1.5-2.0 mm should be selected.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Review
Environmental Sciences
Anna Christine Trego, Simon Mills, Gavin Collins
Summary: Anaerobic digestion is recognized as a sustainable method for waste management, producing methane-rich biogas. Different specialized granules, including anaerobic and aerobic granules, have opened up new opportunities in wastewater treatment and resource recovery biotechnology. Each type of granule has unique characteristics, biochemical processes, and microbial community compositions.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Yang Su, Hong Yang, Xiaotong Wang, Xuyan Liu
Summary: This study demonstrated that the anammox process can stably operate in high-salt environments with the selection of functional bacteria genus Unclassified Candidatus Brocadiaceae. Nitrogen accumulation cannot be alleviated by simply reducing substrate concentration at low temperatures. Adding proper amount of active sludge can quickly improve nitrogen removal performance in adverse conditions and restore it to normal levels.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
C. Polizzi, T. Lotti, A. Ricoveri, R. Campo, C. Vannini, M. Ramazzotti, D. Gabriel, G. Munz
Summary: This study highlights the importance of controlling mineral precipitation on granular sludge systems treating wastewaters prone to inert precipitation to ensure long-term stability. Severe mineral precipitation on the granules' surface can lead to deteriorated reactor performance and biomass activity, with potential mechanisms including substrate diffusion limitation, insufficient mixing, and biofilm erosion. Gravimetric selection proved effective in restoring process performance affected by mineral precipitation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Biotechnology & Applied Microbiology
Jarawee Kaewyai, Pongsak (Lek) Noophan, Simon Guerrero Cruz, Satoshi Okabe
Summary: Biochar derived from sugarcane bagasse carbonized at different temperatures have different effects on granular formation and nitrogen removal in anammox cultures. Biochar300 is found to be the most effective in stimulating anammox granular formation and increasing the suspended solids content. Long-term investigations suggest that biochar300 consistently enhances anammox activity.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2023)
Article
Environmental Sciences
Da Kang, Ping Zheng, Wenji Li, Dongdong Xu, Wenda Chen, Chao Pan
Summary: This study investigates the stratification patterns of anammox granular sludge bed (GSB) and its relationship with microbial activity and community under different nitrogen loading rates (NLRs). Results show that the particle size distribution of GSB is significantly correlated with the nitrogen removal rate (NRR) of the anammox system. The microbial community tends to coverage at high NLR. Additionally, the particle size distribution patterns of GSB may serve as a potential auxiliary indicator to reflect microbial activity and community.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Boran Wu, Xiuzhong Wang, Chengxian Wang, Bin Lu, Jing Yi, Xiaohu Dai, Xiaoli Chai
Summary: A novel high-concentration powder bio-carrier (HPB) process was developed for the high-load treatment of low-strength municipal wastewater with low C/N ratio, which facilitated rapid sludge micro-granulation and enhanced nitrogen removal efficiency. The process achieved higher volumetric load and optimized microbial structure, leading to promising results for the highly efficient treatment of low-strength municipal wastewater.
Article
Engineering, Environmental
Mengjiao Gao, Hongyu Dang, Xin Zou, Najiaowa Yu, Hengbo Guo, Yiduo Yao, Yang Liu
Summary: The addition of granular activated carbon (GAC) in anammox reactors significantly shortened the enrichment time and improved the nitrogen removal efficiency. GAC likely enhanced the oxidation reaction, increased the concentration of signal molecules, and promoted the growth of microorganisms.
Article
Engineering, Environmental
Bo Peng, Tao Xiang, Hong Liang, Dawen Gao
Summary: This study found that low concentrations of acetic acid and propionic acid can enhance the performance of the anammox process. When the organic acid concentration is too high, heterotrophic denitrification begins to dominate. Under organic inhibition, anammox bacteria restore energy supply through the carbon fixation pathway and citrate cycle.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Buqing Chen, Yujie Qin, Chenglong Wu, Zhiju Liu, Lan Yang, Siyuan Gong, Shaohong Zheng
Summary: This study assessed the effect of glucose in a DEAMOX reactor, and found that adding glucose can promote nitrogen removal efficiency while maintaining a synergic relationship between denitrification microorganisms and anammox microorganisms during the DEAMOX process.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Environmental Sciences
Xiao-Ming Ji, Qi Zhang, Wenru Liu, Shu Cai, Liwei Chen, Tianming Cai, Hongxia Yu
Summary: This study reveals that glucose can positively mediate microbial interactions and mixotrophic metabolism in anammox consortia under micro-aerobic conditions, enhancing nitrogen removal efficiency and rate, thus improving anammox activity and microbial interactions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Mengjiao Gao, Xin Zou, Hongyu Dang, Abdul Nayeem Mohammed, Sen Yang, Yun Zhou, Yiduo Yao, Hengbo Guo, Yang Liu
Summary: Enriching anaerobic ammonium oxidation bacteria (anammox) in a membrane bioreactor (MBR) achieved a total nitrogen removal rate of 1.22 kg N/m3/ day over 280 days. Interactions between quorum sensing (QS) and microbial community development were observed, with Acyl-homoserine lactones (AHLs) detected in the MBR effluent. Adding 0.1 μM C8-HSL increased the specific anammox activity (SAA) of the biomass.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
XiaoTong Wang, Hong Yang, Yang Su, XuYan Liu
Summary: The study evaluated the effects of immobilized carrier and temperature changes on nitrogen removal, finding that crushed and encapsulated AnGS showed higher nitrogen removal rates but lower tolerance to Fe2+ and Cu2+. Immobilization reduced the activation energy of anammox and enabled efficient nitrogen removal through temperature-HRT adjustments. High-throughput sequencing analysis revealed shifts in community structure with temperature changes, impacting the dominance of anammox functional bacteria.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Green & Sustainable Science & Technology
Chongjun Chen, Ying Jiang, Jingjing Liu, Mabruk Adams, Yaofeng Chang, Menglei Guo, Junxiang Xie, Jiawei Xie
Summary: This study evaluated the long-term stress effects of varying concentrations of organic matter on nitrogen removal, physiochemical characteristics, and microbial community of anammox granular sludge in UASB reactors. The results showed that high COD concentrations caused disintegration of anammox granular sludge and changes in microbial community structure.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Francisco de Borja Ojembarrena, Elena Fuente, Angeles Blanco, Carlos Negro
Summary: Accumulation of Cr(VI) in industrial fiber cement process water can affect product quality and health, and it needs to be removed to avoid environmental risks. The study found that cationic cellulose nanocrystals (CCNCs) have higher adsorption efficiency and lower cost compared to conventional adsorbents.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Review
Engineering, Environmental
Shentan Liu, Yangchen Zhang, Xiaojuan Feng, Sang-Hyun Pyo
Summary: This paper summarizes the common problems of constructed wetlands (CWs) and proposes corresponding optimized solutions, including thermal insulation and additional aeration in cold climates, choosing suitable plant species and planting patterns to enhance phytoremediation in CWs, using various methods to monitor and evaluate CW clogging, implementing anti-clogging measures, controlling greenhouse gas emissions during CW treatment, constructing and utilizing CW databases, designing appropriate CW types, and implementing strict technical management and supervision.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Norzila Mohd, Nazlina Haiza Mohd Yasin, Wan Hasnidah Wan Osman, Mohd Sobri Takriff
Summary: This study demonstrates that Chlamydomonas sp. is effective in removing nutrients from palm oil mill effluent and shows particular efficiency in the removal of ammonium and phosphate.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Mingzhen Zhang, Guijian Liu, Ruijia Liu, Jinzhao Xu, Wen Si, Yong Wei
Summary: Tieguanyin tea stem was used to synthesize modified biochar for the adsorption of copper and zinc. Among the modified biochar, Fe-BCs had the highest adsorption capacity, with Fe-BC650 being the best adsorbent. It reached adsorption equilibrium in 1 minute and had a maximum adsorption capacity of 303.5996 mg/g for Cu (II) and 254.0711 mg/g for Zn (II) in single-metal solutions. However, there were antagonistic impacts between Cu2+ and Zn2+.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Lingling Zhao, Qiaoshu Zhou, Yun Yang, Yuan Zhang, Yewei Qiu, Yanjun Chen, Xian Jin, Xiangjun Yang, Shixiong Wang
Summary: This research presents a method for selectively recovering gold from e-waste water using metal sulfides microspheres prepared by hydrothermal technique. The results show that the assistance of visible light significantly improves the gold adsorption performance of metal sulfides. The metal sulfides exhibit excellent gold adsorption properties, high selectivity, ultra-high adsorption capacity, and good recyclability.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Laishram Saya, W. Rameshwor Singh, Sunita Hooda
Summary: Organic-inorganic nanoblends, such as polysaccharide-blended-inorganic ones, have versatile applications and have gained significant research attention. In this study, a magnetic guar gum/graphene oxide nanocomposite blended with CuO was successfully prepared and investigated for its adsorption capacity for ciprofloxacin removal. The results showed that the nanocomposite exhibited excellent adsorption capacity and the adsorption process was spontaneous.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Umit Ecer, Sakir Yilmaz
Summary: A novel and effective catalyst Co@MIL-68(Fe)@Fe3O4@CM-BC was synthesized and used for the catalytic reduction of crystal violet in aqueous environments. The catalyst showed high efficiency in degrading crystal violet under specific conditions, and exhibited good regeneration performance.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Chi Zhang, Miao Zhang, Haohan Yang, Wei Cai, Jun Wu
Summary: Enhancing the bioaugmentation of common nitrifiers in the partial nitrification/anammox process can decrease the activity of nitrite oxidizing bacteria and increase the activity of anammox bacteria, leading to improved total nitrogen removal efficiency.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Runzhang Zuo, Dajun Ren, Yangfan Deng, Canhui Song, Yubin Yu, Xiejuan Lu, Feixiang Zan, Xiaohui Wu
Summary: This study found that fine bubble aeration in membrane bioreactors (MBR) can better control membrane fouling and reduce energy consumption. However, compared to fine bubble aeration, coarse bubble aeration released more proteins and polysaccharides, resulting in a decrease in functional bacteria and enzymes involved in nitrogen and phosphorus pathways.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Ch Tahir Mehmood, Jiekai Dai, Hanjun Zhao, Ziyi Zhong
Summary: Wirelessly powered photocatalyst-coated spheres (WPS) have been developed and demonstrated for various applications, including photodegradation and fouling control. These WPS are cost-effective, easy to fabricate, and have excellent visible light sources, making them suitable as carriers for photocatalysts.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Yifan Wang, Xiaoxuan Kang, Yuting Li, Ruyi Li, Chang Wu, Luyao Wang, Chongqing Wang, Tao Yang, Ming Ge, Zhangxing He
Summary: Cobalt/carbon nanofibers (Co/CNF) were prepared and exhibited excellent catalytic activity in the degradation of tetracycline by activating peroxodisulfate (PDS). The effects of process parameters on tetracycline removal were studied, and the reaction mechanism was confirmed through experiments.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Ting Wei, Yaqian Zhao, Jia Guo, Bin Ji, Alvaro Pun Garcia, Abraham Esteve Nunez
Summary: This study developed a novel lightweight substrate (Al-NLS) composed of aluminum sludge and polyurethane, and investigated its effectiveness in constructed wetlands (CWs). Results showed that Al-NLS had favorable adsorption capacities for phosphorus and removal efficiencies for pollutants in real domestic wastewater. It also positively influenced the microbial community. Therefore, Al-NLS can be considered as a new alternative substrate in CWs technology.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Dabojani Das, Achinta Bordoloi, Heyang Yuan, Daniel J. Caldwell, Rominder P. S. Suri
Summary: This study evaluates the degradation kinetics of antibiotic resistance genes and mobile genetic elements in water matrices by ozone treatment. The results show that extracellular antibiotic resistance genes can be effectively removed, while intracellular genes are more resistant to degradation. The impact of wastewater matrix on gene degradation is minimal.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)