Review
Environmental Sciences
Hoang Dung Nguyen, Sandhya Babel
Summary: This study critically reviews the nitrogen removal process and influencing factors in various MFC configurations, highlighting shortcut nitrification-autotrophic denitrification and heterotrophic anodic denitrification as promising options, although further evaluation on efficiency and gas emissions is needed. The selection of MFC configuration depends on the nature of the wastewater.
ENVIRONMENTAL RESEARCH
(2022)
Review
Environmental Sciences
Qi Zhou, Haimeng Sun, Lixia Jia, Weizhong Wu, Jianlong Wang
Summary: This review summarizes the key to improving the water quality of wastewater treatment plants (WWTPs) - simultaneous removal of nitrogen and phosphorus. The composition of secondary effluent from municipal WWTPs is introduced, and three main treatment processes for simultaneous nitrogen and phosphorus removal are summarized. Their performances, mechanisms, influencing factors, and microbial community structures are analyzed. The advanced removal of nitrogen and phosphorus by different technologies is compared and summarized. The challenges and future prospects of simultaneous removal of nitrogen and phosphorus technologies for secondary effluent are proposed.
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
Environmental Sciences
Yilin Li, Wenjia Zhang, Yun Dai, Xiaomei Su, Yeyuan Xiao, Dan Wu, Faqian Sun, Rongwu Mei, Jianrong Chen, Hongjun Lin
Summary: This study investigated the start-up, influencing factors, and stable operation of partial denitrification for treating biological effluent from landfill leachate. The research found a suitable ratio of nitrate/ammonium for downstream Anammox process, and highlighted the importance of carbon sources, COD/NO3--N ratio, and salinity in partial denitrification.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agricultural Engineering
Wencheng Ma, Dapeng Zhou, Dan Zhong, Jinxin Li, Jingna Zhang, Peng Su, Xiaotong Liu, Jiaju Dong, Shaobo Zhang, Xuan Du
Summary: This study investigated the use of corncob-sulfur as fillers in a filled bed denitrification system for treating secondary effluent of wastewater. The results showed that alkali pretreated corncobs can maintain a long-term denitrification effect. The mixotrophic denitrification reactor with alkali-treated corncob-sulfur as a filler achieved high denitrification efficiency under optimal operating conditions, and exhibited a diverse species community structure.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Fangzhai Zhang, Yongzhen Peng, Zhong Wang, Hao Jiang, Shang Ren, Jingang Qiu
Summary: A novel process combining partial nitrification, fermentation, and Anammox-partial denitrification was proposed for co-treating ammonia-rich sludge supernatant, external WAS, and WWTP secondary effluent, achieving excellent nitrogen removal efficiency and external sludge reduction. This process showed significant collaboration between Anammox bacteria and partial denitrifying bacteria in the AD-UASB reactor, contributing to up to 84.1% of nitrogen removal, while saving organic resource demand and aeration consumption compared to traditional nitrification-denitrification processes.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Lianfang Zhao, Liuying Xue, Li Wang, Cheng Liu, Ying Li
Summary: Heterotrophic-autotrophic denitrification is a cost-effective and risk-reducing approach for wastewater treatment. This study investigated a mixotrophic denitrification system with mixed bacteria to treat low-C/N ratio wastewater and achieved lower total nitrogen (TN) levels compared to heterotrophic and ferrous autotrophic systems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Alex Abu, Raul Carrey, Cristina Valhondo, Cristina Domenech, Albert Soler, Lurdes Martinez-Landa, Silvia Diaz-Cruz, Jesus Carrera, Neus Otero
Summary: This study evaluates the treatment effectiveness of Soil Aquifer Treatment (SAT) systems for nitrogen compounds using chemical and isotopic tools. The results show that coupled nitrification-denitrification is the main mechanism responsible for nitrogen migration and distribution. The study also reveals that the addition of a permeable reactive barrier can enhance the removal of nitrogen compounds in the SAT system.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Mohammad Zounemat-Kermani, Meysam Alizamir, Behrooz Keshtegar, Okke Batelaan, Reinhard Hinkelmann
Summary: This study evaluated the potential of kriging-based and machine learning models in predicting effluent arsenic concentration, with results showing that the kriging-logistic method performed the best and incorporating feature selection enhanced model performance by around 7.8%.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Siying Sun, Jiabao Ren, Jiale Liu, Liang Rong, Hangli Wang, Yeyuan Xiao, Faqian Sun, Rongwei Mei, Chongjun Chen, Xiaomei Su
Summary: The study found that pyrite-activated persulfate oxidation efficiently removed organic matter from the effluent of a biological landfill leachate treatment system, and subsequent denitrification was also successful. With the optimal parameters, a COD removal efficiency of about 45% and a nitrate removal rate of around 108 mg L-1 d(-1) were achieved.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Miao Pu, Nuerla Ailijiang, Anwar Mamat, Jiali Chang, Qiongfang Zhang, Yifan Liu, Nanxin Li
Summary: Reclaimed wastewater is being used to address water scarcity in arid areas, but this study found the presence of antibiotics in reclaimed water and their potential impacts on the soil environment. Although the wastewater treatment systems can remove some antibiotics, residual antibiotics still affect the soil and pose toxicity risks.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Agricultural Engineering
M. Atasoy, W. T. Scott Jr., K. van Gijn, J. J. Koehorst, H. Smidt, A. A. M. Langenhoff
Summary: Optimizing bioreactor performance is crucial for sustainable and energy-efficient removal of micropollutants in tertiary treatment. The resident microbial community plays a significant role in bioreactor performance, hence a deeper understanding of community dynamics is essential. By characterizing the microbial communities in three different bioreactors used for organic matter removal, an interdependency between bioreactor performance and microbial community profile was observed. A generalized Lotka-Volterra model was established to understand the interactions in the microbial community and develop strategies for improving bioreactor performance.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Chemical
Yuan Bai, Yin-Hu Wu, Rui-Ning Wang, Yu-Qing Xu, Xin Tong, Wei Wang, Kui-Xiao Li, Nozomu Ikuno, Koji Nakata, Hong-Ying Hu
Summary: This study investigated the impact of denitrification filter (DNF) operation on ultrafiltration (UF) membrane fouling during wastewater reclamation. It was found that increasing the carbon source dosage in DNF led to aggravated membrane fouling. Glucose was identified as the most fouling-prone carbon source. Water samples with higher fouling potential contained more hydrophobic components. Hydrophobic acids and hydrophobic neutrals dominated the membrane fouling process and exhibited strong interaction with the membranes. Optimizing external carbon addition could effectively regulate the levels of these fractions, thereby reducing UF fouling.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Zhongchen Yang, Qi Zhou, Haimeng Sun, Lixia Jia, Liu Zhao, Weizhong Wu
Summary: The study constructed pilot-scale solid-phase denitrification systems with different carbon sources, analyzed the impact on microbial community structure, functions and metabolic pathways. PHBV-sawdust system outperformed the PHBV system in nitrogen removal efficiency, DOC release and NH4+-N accumulation. Metagenomic analyses revealed significant differences in microbial community structure between systems and the presence of four anaerobic anammox bacteria.
Article
Biotechnology & Applied Microbiology
N. Nirmalakhandan, X. Cheng, S. P. Munasinghe-Arachchige, H. M. K. Delanka-Pedige, Y. Zhang
Summary: This study demonstrates the inactivation performance of the A-WWT system in comparison to high-rate algal ponds, activated sludge, and membrane bioreactors, showing that the A-WWT system achieves a greater log reduction per unit energy input/volume of wastewater. Additionally, the concentrations of nitrogenous DBPs in the algal effluent were found to be below 50 ng/L.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2022)