Article
Green & Sustainable Science & Technology
Chihao Lin, Xiangmin Xiao, Yu-You Li, Jianyong Liu
Summary: Anaerobic ammonium oxidation (anammox) technology is seen as a promising alternative for wastewater treatment, with partial denitrification anammox (PDA) and partial nitritation anammox (PNA) being the mainstream processes. Comprehensive evaluation of their economic and environmental benefits is essential. The study proposed and analyzed two plant-wide processes, and showed that high rate activated sludge-PNA (HRAS-PNA) was more energy-efficient and cost-effective compared to chemically enhanced primary treatment-PDA (CEPT-PDA), with a significant decrease in total environmental impacts.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Engineering, Environmental
Zhiyao Wang, Min Zheng, Haoran Duan, Zhiguo Yuan, Shihu Hu
Summary: This study examines the progress of nitrite-oxidizing bacteria (NOB) suppression in both the sidestream and mainstream partial nitritation and anammox (PN/A) processes over the past two decades. It highlights the challenges in achieving stable NOB suppression in mainstream treatment and suggests the potential of a hybrid process and combination of strategies for efficient mainstream PN/A.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Ming Li, Longzhi Liu, Zhiye Sun, Boyang Hu, Xinglin Li, Meichao Lan, Hong Guo, Baoan Li
Summary: In this study, a novel adsorption-biodegradation (A-B) process, using flocculation pretreatment as A-stage and nitritation-denitritation MABR as B-stage, was proposed to reduce carbon emissions from sewage treatment. The results showed that flocculation with polyaluminium ferric chloride (PAFC) could remove 27.37%-49.69% of organics from actual wastewater. The pretreated wastewater could be further treated by nitritation-denitritation MABR with low aeration pressure, achieving high removal efficiency of NH4+-N, total nitrogen (TN), and chemical oxygen demand (COD).
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Review
Green & Sustainable Science & Technology
Hongjun Zhao, Yan Guo, Qunhui Wang, Ze Zhang, Chuanfu Wu, Ming Gao, Feng Liu
Summary: The mainstream partial nitritation/anammox (PN/A) process shows promise in reducing costs compared to traditional biological nitrogen removal. However, the nitrite production rate (NPR) is lower in the biological nitritation pre-treatment process, which limits the operation of the PN/A process with higher nitrogen loading rates. This study provides a comprehensive review of nitrite production processes, microbial species involved in biological nitritation, existing problems, and proposes a novel and promising PN/A process facilitated with photocatalyst oxidation.
Article
Engineering, Environmental
Zhiyao Wang, Min Zheng, Haoran Duan, Shihu Hu, Zhiguo Yuan
Summary: Sewage treatment with partial nitritation and anammox (PN/A) has gained attention for its potential to establish energy-neutral/positive sewage treatment plants. One key challenge for this process is the suppression of nitrite-oxidizing bacteria (NOB). This study proposes a three-stage configuration comprising a PN/A reactor, an acidic PN reactor, and an anammox reactor to address this challenge. Simulation results indicate that the three-stage process can achieve stable and high-quality effluent with a nitrogen removal efficiency over 90%.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Sabine Marie Podmirseg, Maria Gomez-Brandon, Markus Muik, Blaz Stres, Martin Hell, Thomas Puempel, Sudhir Murthy, Kartik Chandran, Hongkeun Park, Heribert Insam, Bernhard Wett
Summary: Sidestream partial nitritation and deammonification (pN/A) is a well-established technology for treating high-strength ammonia wastewater. However, its application in the mainstream treatment is hindered by poor retention of anaerobic ammonia-oxidizing bacteria (AnAOB), insufficient repression of nitrite oxidizing bacteria (NOB), and difficult control of soluble chemical oxygen demand and nitrite levels. This study monitored a full-scale municipal wastewater treatment plant and found that regular transfer of sidestream biomass and enrichment of granular anammox biomass were crucial for AnAOB establishment in the mainstream.
Article
Engineering, Environmental
Anndee L. Huff Chester, Kiwon Eum, Michael Tsapatsis, Marc A. Hillmyer, Paige J. Novak
Summary: Utilizing zeolite-coated hollow fiber membranes improved the growth of anammox bacteria and total nitrogen removal in mainstream-type media. Increasing the quantity of zeolite further enhanced the retention of anammox bacteria and the removal of total nitrogen. Application of membranes with higher zeolite content in integrated fixed-film activated sludge (IFAS) or membrane-aerated biofilm reactor (MABR) systems could facilitate mainstream anammox.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2021)
Article
Agricultural Engineering
Wenyu Li, Jianwei Li, Ying Liu, Ruitao Gao, Liyan Deng, Chengkun Kao, Yongzhen Peng
Summary: A novel double-anammox process for advanced mainstream nitrogen removal was established using a step-feed sequencing batch reactor (SBR) system, which effectively reduced total inorganic nitrogen concentration and achieved a 71.4% contribution of anammox to nitrogen removal. Gradient C/N reduction facilitated denitratation/anammox in the anoxic stage, and simultaneous nitritation and anammox were achieved in the oxic stage.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Kai Lv, Dangcong Peng, Yun Han, Lifang Yu
Summary: Enrichment and accumulation of anammox bacteria in aerobic biofilm is crucial for successful nitrogen removal in municipal wastewater treatment plants. This study detected a relatively high percentage of anammox bacteria in the biofilm of two WWTPs in Xi'an, China, and estimated their contribution to nitrogen removal. These findings suggest that aerobic biofilm could enhance nitrogen removal in mainstream.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Environmental Sciences
Lisheng Wang, Wancong Gu, Yanchen Liu, Peng Liang, Xiaoyuan Zhang, Xia Huang
Summary: This paper summarizes the challenges and solutions of mainstream anammox-based process by reviewing the literature of the past decade. The slow growth rate of anammox bacteria and the need for enhancing bacteria retention are identified as the main challenges. Various methods to culture anammox bacteria and improve their activity are discussed. Other challenges include the elimination of nitrite oxidizing bacteria (NOB) and achieving the ideal ratio of NH4+ and NO2-. To overcome these challenges, composite control strategies based on low sludge retention time (SRT) and limited aeration are suggested. Interference from low temperature and influent components in actual wastewater treatment is addressed, as well as the use of coupling processes to reduce nitrate concentration in the effluent. The paper concludes with future prospects for the mainstream anammox-based process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Gamze Kirim, Kester McCullough, Thiago Bressani Ribeiro, Carlos Domingo-Felez, Haoran Duan, Ahmed Al-Omari, Haydee De Clippeleir, Jose Jimenez, Stephanie Klaus, Mojolaoluwa Ladipo-Obasa, Javad Mehrani, Pusker Regmi, Elena Torfs, Eveline I. P. Volcke, Peter A. Vanrolleghem
Summary: This article provides an overview of the current state-of-the-art in modelling short-cut nitrogen removal processes in mainstream wastewater treatment, identifying future research directions and challenges. The importance of mathematical models in considering N2O emissions and the need for new, advanced approaches are emphasized.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Xiaofei Gong, Liang Zhang, Xiyao Li, Qiong Zhang, Taotao Shang, Jingwen Guo, Chuanxin Wang, Shuying Wang, Yongzhen Peng
Summary: This study proposed a novel Integrated Anammox, Fermentation and Denitrification (IAFD) process which achieved a high efficiency of nitrogen removal from wastewater. The process showed environmental and economical advantages with no external carbon requirement, reduced aeration, and sludge reduction.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Environmental
B. M. Wagner, G. T. Daigger, N. G. Love
Summary: This study investigates the impact of reactor configuration on the performance of PNA MABR and suggests that a 2-stage configuration can achieve higher nitrogen removal rate compared to 1-stage or hybrid configurations, providing insights for implementing PNA MABRs in mainstream nitrogen removal.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
S. K. Tellez-Perez, S. Wyffels, H. KleinJan, C. Meunier, R. Gerards
Summary: Partial nitritation-anammox process was successfully conducted in a continuous fed Sequencing Batch Reactor (cf-SBR) to remove nitrogen from anaerobic effluent of the potato industry at different loading rates, with nitrogen removal and ammonia oxidation reaching 62% and 74% respectively at the highest loading rate. The study also observed improvements in sludge characteristics and confirmed the presence of anammox bacteria through molecular analysis. The cf-SBR demonstrated its capability as a suitable and feasible technology for advanced nitrogen removal under partial nitritation and anammox conditions.
Article
Agricultural Engineering
Wenyu Li, Yongzhen Peng, Ruitao Gao, Qiong Zhang, Xiyao Li, Chengkun Kao, Jianwei Li
Summary: This study investigates the impact of low salinity levels on a double-anammox system in treating municipal wastewater, finding that a salinity of 1.0% led to a nitrogen removal efficiency of 81.2%, with a significant contribution of 76.5% from anammox. Low salinity was also found to promote nitritation and denitratation, enhancing the overall nitrogen removal efficiency. The enrichment of specific microbial populations, such as Ca. Brocadia and Nitrosomonas, further supported the effectiveness of the double-anammox process in treating saline wastewater.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Shun Wang, Yuansheng Hu, Zhenhu Hu, Weixiang Wu, Zhongzhong Wang, Yan Jiang, Xinmin Zhan
Summary: Dry anaerobic co-digestion (AcoD) with 20% total solids content was more effective in reducing total antibiotic resistance genes (ARGs), especially aminoglycosides, multidrug, and sulfonamide resistance genes, compared to wet AcoD with 5% total solids content. Efflux pump and antibiotic deactivation resistance mechanisms of ARGs were significantly reduced by dry AcoD. Network analysis revealed significant correlations between ARGs, mobile genetic elements (MGEs), and microbial communities.
Review
Environmental Sciences
Qidong Yin, Zhaolu Feng, Yuansheng Hu, Xinmin Zhan, Guangxue Wu
Summary: This review summarized recent findings of microbial interactions, many of which have huge potentials to advance environmental biotechnologies. Multi-omics methods should be further applied for comprehensively confirming known and unknown microbial processes. The co-occurrence network should be applied to unravel the interlinks among substrate degradation, energy utilization, electron transfer, and information exchange. The proper regulation of microbial interactions in practical application should be further addressed.
CURRENT POLLUTION REPORTS
(2021)
Article
Engineering, Environmental
Lin Shi, Zhenhu Hu, Yu Wang, Er Bei, Piet N. L. Lens, Olivier Thomas, Yuansheng Hu, Chao Chen, Xinmin Zhan
Summary: The study introduced a novel electrodialysis system, anode-ED, which effectively removes antibiotics from animal manure while recovering nutrients. Compared to conventional ED, anode-ED can more efficiently remove targeted antibiotics, reduce membrane fouling, and efficiently deactivate pathogenic microorganisms.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Bo Hu, Jianing Quan, Kun Huang, Jianqiang Zhao, Guohua Xing, Pei Wu, Ying Chen, Xiaoqian Ding, Yuansheng Hu
Summary: The C/N ratio and DO concentration are crucial factors influencing the aerobic denitrification process, with the model revealing that nitrogen removal efficiency increases with higher C/N ratio and lower DO concentration. The synthesis of cell internal storage products is impacted by C/N ratio, while the effects of DO concentration are due to competition for substrate between heterotrophs and aerobic denitrifiers.
Review
Environmental Sciences
Yilin Wang, Xin Gu, Jianing Quan, Guohua Xing, Liwei Yang, Chuanliang Zhao, Pei Wu, Fan Zhao, Bo Hu, Yuansheng Hu
Summary: This review discussed the application of magnetic field in wastewater treatment and critically elaborated the mechanisms of magnetic field-enhanced wastewater treatment from the perspective of magnetic physicochemical and biological effects. The focus was on summarizing the application of magnetic field in magnetic adsorption-separation of heavy metals and dyes, treatment of domestic wastewater, and photo-magnetic coupling technology.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Zhongzhong Wang, Shun Wang, Sihuang Xie, Yan Jiang, Jizhong Meng, Guangxue Wu, Yuansheng Hu, Xinmin Zhan
Summary: The study found that the addition of biochar has a slight increase in specific methane yield in dry anaerobic digestion, especially in the degradation of poorly biodegradable organics. However, the supplementation of biochar did not significantly affect the peak methane production rate, possibly due to the important role of enhancing electron transfer mechanism.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Chemical
Jizhong Meng, Lin Shi, Zhenhu Hu, Yuansheng Hu, Piet Lens, Shun Wang, Xinmin Zhan
Summary: The novel electro-ion substitution modified electrodialysis (EIS-ED) system is effective in recovering NH4+ with reduced membrane fouling and scaling, along with lower energy consumption compared to conventional electrodialysis.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Environmental Sciences
Shasha Qi, Jingrou Chen, Yuansheng Hu, Zhenhu Hu, Xinmin Zhan, Dagmar B. Stengel
Summary: This study assessed the economical harvesting performance of hydrophobic microalgae using electro-flotation. The results showed that microalgal hydrophobicity played a critical role in electro-flotation, with highly hydrophobic microalgae being more effectively harvested compared to moderately hydrophobic and hydrophilic microalgae.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Zhongzhong Wang, Shun Wang, Yuansheng Hu, Bang Du, Jizhong Meng, Guangxue Wu, He Liu, Xinmin Zhan
Summary: The shift from acetoclastic to hydrogenotrophic pathway in methanogenesis under ammonia inhibition is a common phenomenon. This study investigated the ammonia tolerance and recovery of acetoclastic and hydrogenotrophic methanogens in anaerobic digestion. The results showed that hydrogenotrophic methanogens had higher tolerance to ammonia than acetoclastic methanogens, but were more adversely affected by NH4+ at pH≤8.0.
Article
Biotechnology & Applied Microbiology
Shasha Qi, Zhongzhong Wang, Yuansheng Hu, Ji Lei, Xinmin Zhan, Dagmar B. Stengel
Summary: The study proposes a solution to the challenges of microalgae cultivation in wastewater treatment through selective enrichment of auto-floating microalgae in a photo-bioreactor. The enriched microalgae demonstrated excellent nutrient removal efficiency and biodiesel production potential, as well as a high content of beta-glucans with wide applications. The autoflotation mechanism achieved cost-effective harvesting and dewaterability. Overall, this approach offers great opportunities for a microalgae-based biorefinery in sustainable wastewater bioremediation.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2023)
Review
Green & Sustainable Science & Technology
Zhongzhong Wang, Yuansheng Hu, Shun Wang, Guangxue Wu, Xinmin Zhan
Summary: The dry anaerobic digestion (AD) process is a promising technology for the treatment and stabilization of high-solid organic waste, with advantages such as higher methane yield and reduced digester size. However, it still faces challenges due to the excessive solids content and differences from wet AD in terms of operation and design. It is important to understand the characteristics of dry AD, analyze operational factors, and evaluate optimization methods to develop practical applications.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Environmental Sciences
Chao Liu, Xiaoran Zhang, Junfeng Liu, Zhifei Li, Ziyang Zhang, Yongwei Gong, Xiaojuan Bai, Chaohong Tan, Haiyan Li, Junqi Li, Yuansheng Hu
Summary: Reactive oxygen species (ROS) generated by chemical or biochemical processes in the natural environment can deteriorate plastic rainwater facilities and cause the release of microplastics. Using Fenton reagents, this study simulated the ROS-induced ageing process of three typical plastic rainwater components and investigated the subsequent release of microplastics. The results showed that ROS-induced ageing led to surface deterioration and the release of microplastics due to the generation of oxygen-containing functional groups and the breaking of carbon chains. The amount and size of released microplastics varied with the type of rainwater facilities and ageing time.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Xiaoran Zhang, Yuyang Gu, Yinrui Wang, Junfeng Liu, Yucheng Jiang, Yiran Tian, Ziyang Zhang, Chaohong Tan, Yu Wang, Haiyan Li, Yuansheng Hu
Summary: Six PAHs were detected in runoff from five athletic fields during three rainfall events, with the highest concentrations found in artificial turf. Surface characteristics of the fields played a role in the release of PAHs, and high rainfall intensity facilitated their release. Only the artificial turf showed a first flush effect. Ecological risk assessment indicated moderate-to-high risk, while health risk assessment suggested a potential carcinogenic danger via dermal contact.
WATER SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Chemical
Pei Wu, Yilin Wang, Jianing Quan, Kun Huang, Xiaoqing Ma, Bo Hu, Yuansheng Hu
Summary: Direct biological oxidation of ammonium to dinitrogen gas via oxygen is an exergonic reaction catalyzed by chemolithotrophic microorganisms. When energy-transfer efficiencies are between 20%-70% and sludge retention times are between 10-20 days, microbial yields range from 0.0225-0.2424 mg Cell/mg N.
DESALINATION AND WATER TREATMENT
(2021)
