Article
Engineering, Environmental
Yuanyuan Miao, Liang Zhang, Deshuang Yu, Jianhua Zhang, Wenke Zhang, Guocheng Ma, Xinchao Zhao, Yongzhen Peng
Summary: Intermittent aeration is an effective strategy for biological wastewater treatment, allowing for advanced nitrogen removal and reduced energy consumption. It is suitable for partial nitrification and denitrification processes.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Rongfen Chen, Yan Zhou
Summary: This study demonstrates a synchronized aerobic and anaerobic ammonium removal process in a membrane aerated biofilm reactor (MABR) by adjusting the lumen pressure. The results show improved nitrogen removal efficiency by minimizing interference from nitrite oxidizing bacteria (NOB) and achieving stable anammox bacteria. Connecting two MABRs in series further enhances the total nitrogen removal efficiency.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
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
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
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
Agricultural Engineering
Shuai Li, Jialin Li, Shenhua Yang, Qiong Zhang, Xiyao Li, Liang Zhang, Yongzhen Peng
Summary: This study developed a novel strategy to achieve partial nitrification by selectively enriching ammonium oxidizing bacteria without the need for additional chemical agents. By controlling aeration time, the study successfully eliminated AOB and NOB, while maintaining high nitrite accumulation rates in effluent suitable for mainstream wastewater anammox.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Hao Su, Yukun Deng, Jiejun Zhao, Chen Lai, Longwen Xiao, Shengliang Li, Jianwei Zhao, Qiang Luo, Dachao Zhang, Bingyan Dong
Summary: A novel three-stage PD/PN/Anammox system was established, which showed low oxygen and COD consumption, and better removal efficiency for ammonia nitrogen and total nitrogen.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Yiyi Zhao, Ying Dong, Xue Chen, Zhibin Wang, Zhaojie Cui, Shou-Qing Ni
Summary: The partial nitrification-anammox (PNA) process is a new green biological nitrogen removal technology that utilizes sulfide to selectively inhibit nitrite oxidizing bacteria (NOB) activity while promoting sulfur autotrophic denitrification (SAD) process, thereby improving nitrogen removal efficiency and sulfur removal efficiency.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Fumin Zuo, Wenhui Yue, Shuanglin Gui, Qianwen Sui, Yuansong Wei
Summary: This review article discusses the key issues and bottlenecks in the implementation of mainstream anaerobic ammonium oxidation (anammox), including startup, stable NO2--N supply, maintenance and dominance of AnAOB with high activity, prevention of NO3--N buildup, reduction of sludge loss, adaptation to seasonal temperature variations, and alleviation of COD impacts on AnAOB. In order to improve the startup, stable operation, and resilience of mainstream anammox, a combined biological nitrogen removal (CBNR) system based on conventional denitrification, shortcut nitrification-denitrification, partial nitritation, and partial denitrification combined with anammox (PANDA) process is proposed to adapt to the variations of seasonal temperature and pollutants in the influent.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Wenke Zhang, Deshuang Yu, Jianhua Zhang, Yuanyuan Miao, Xinchao Zhao, Guocheng Ma, Jiawen Li, Yu Zhang
Summary: The feasibility of starting up a mainstream single-stage partial nitrification-anammox (SPNA) system by inoculating nitrification sludge and anammox biofilm was investigated. The experiment showed that the SPNA system could be rapidly started up with high TN removal efficiency.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Tiantian Hu, Yongzhen Peng, Chuansheng Yuan, Qiong Zhang
Summary: The novel SPNEDpr system operated for 213 days in a sequencing batch reactor to treat real domestic sewage, achieving efficient nutrient removal and the formation of aerobic granular sludge through optimizing intermittent aeration conditions. The system provided a highly efficient and economical method for treating urban sewage.
Article
Agricultural Engineering
Yan Feng, Bo Wang, Yongzhen Peng, Xiyao Li, Qiong Zhang
Summary: A continuous plug-flow reactor was used to treat municipal wastewater, achieving stable nitrification and denitrification through different zones and conditions. Results showed that the PN-SAED process had high nitrogen removal efficiency and contribution rate, making it a promising method for nitrogen removal.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Hong Chen, Zhi Tu, Sha Wu, Guanlong Yu, Chunyan Du, Hong Wang, Enzhe Yang, Lu Zhou, Bin Deng, Dongbo Wang, Hailong Li
Summary: The novel process of partial denitrification (PD) coupled with anaerobic ammonium oxidation (AMX) shows great potential for nitrogen removal in municipal wastewater treatment. Research focuses on process mechanisms, microbial community characteristics, key operational parameters, stable operation, and control methods. Challenges lie in engineering and economic feasibility, full mainstream AMX application, and further study of PD-AMX mechanism optimization for better engineering practice.
Article
Engineering, Environmental
Zhiyao Wang, Min Zheng, Zhetai Hu, Haoran Duan, Haydee De Clippeleir, Ahmed Al-Omari, Shihu Hu, Zhiguo Yuan
Summary: This study successfully controlled nitrite-oxidizing bacteria through the application of three consecutive suppression strategies, ultimately achieving significant improvement in nitrogen removal efficiency.
Article
Agricultural Engineering
Eduardo Paniguel Oliveira, Alessandra Giordani, Juliana Kawanishi, Theo Syrto Octavio de Souza, Dagoberto Y. Okada, Gunther Brucha, Rafael Brito de Moura
Summary: The structured-bed reactor with intermittent aeration (SBRIA) is a promising technology for simultaneous carbon and nitrogen removal from wastewater. The microbial community in the reactor plays a crucial role in its optimization. This study analyzed biofilm samples from different zones of an SBRIA to understand the bacterial community shift with variations in airflow and aeration time, and found that control of these parameters is essential for efficient nitrogen removal.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Shenhua Yang, Yongzhen Peng, Qiong Zhang, Jialin Li, Liang Zhang
Summary: In this study, time-series anammox functional biofilms were obtained in a lab-scale simultaneous partial nitritation/anammox process. The growth rates of anammox bacteria were evaluated and the role of ammonia oxidizing bacteria in the proliferation of anammox bacteria was explored. The study highlights the importance of microbial diversity and stable community composite in the proliferation of anammox bacteria.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Tipei Jia, Shihao Sun, Qi Zhao, Yongzhen Peng, Liang Zhang
Summary: This study investigated H2S removal and biomass variations in a biotrickling filter (BTF) under highly acidic conditions. The results showed that the BTF achieved efficient H2S removal at pH 0.5-1.0, and the enrichment of acidophilic sulfur-oxidizing bacteria (SOB) in the acidic biofilm maintained the balance of the biofilm thickness, ensuring oxygen transfer and H2S oxidation.
Article
Environmental Sciences
Yandong Yang, Yiming Jiang, Yanan Long, Jiarui Xu, Changqing Liu, Liang Zhang, Yongzhen Peng
Summary: This study investigates the impact of residual ammonium on the stability of mainstream partial nitritation/anammox (PN/A) systems and reveals that low ammonium conditions lead to a decline in anammox activity and increased nitrite oxidation rate. The study provides insights for the optimized design of mainstream PN/A systems in engineering applications.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Engineering, Environmental
Huihui Cui, Liang Zhang, Qiong Zhang, Xiyao Li, Yongzhen Peng
Summary: This study found that comammox bacteria, which were previously overlooked, are the most important ammonia-oxidizing microbes in Anammox systems, and play a significant role in nitrogen removal.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Xinjie Gao, Liang Zhang, Yongzhen Peng, Jing Ding, Zeming An
Summary: The study found that stable nitrogen removal can be achieved in the anaerobic/aerobic/anoxic process by directly integrating stable anammox. The anammox activity compensates for the effects of low temperatures and low C/N ratios on nitrification and denitrification, leading to a stable nitrogen removal efficiency.
CHEMICAL ENGINEERING JOURNAL
(2023)
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
Environmental Sciences
Tipei Jia, Liang Zhang, Shihao Sun, Qi Zhao, Yongzhen Peng
Summary: In this study, acidophilic mixotrophic sulfur-oxidizing bacteria (SOB) were enriched under extremely acidic conditions to enhance bio-desulfurization performance. The addition of organics improved the H2S removal efficiency. Maintaining an appropriate biofilm mass is crucial for optimal desulfurization performance. The findings of this study offer a novel strategy for enhancing H2S removal.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Tipei Jia, Liang Zhang, Xiyao Li, Qi Zhao, Yongzhen Peng, Jun Sui, Chuanxin Wang
Summary: This study investigates the impact of seasonal temperature variations on the performance of a biotrickling filter system in removing hydrogen sulfide from air. It is found that the system achieves the highest removal efficiency at temperatures of 10-12 degrees Celsius. The accelerated growth of biofilm, enhanced biofilm adhesion capacity, and sulfur accumulation contribute to heat retention in cold conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Shenhua Yang, Haibin Chang, Yongzhen Peng, Shujun Zhang, Xiaoyu Han, Shihao Sun, Jinjin Liu, Liang Zhang
Summary: Adding fermented sludge products to SBR can enhance nutrient removal and reduce sewage treatment costs.
WATER ENVIRONMENT RESEARCH
(2023)
Article
Engineering, Environmental
Hanbin Wang, Liang Zhang, Qiongpeng Dan, Yingxin Zhang, Shuying Wang, Qiong Zhang, Xiyao Li, Chuanxin Wang, Yongzhen Peng
Summary: Integrating endogenous denitrification (ED) into partial nitrification-anammox (PNA) systems using organic matter in municipal wastewater effectively improves nitrogen removal efficiency. A novel strategy was adopted to inhibit phosphorus-accumulating organisms (PAOs) by inducing phosphorus release and exclusion, optimizing organics allocation between PAOs and glycogen-accumulating organisms (GAOs). This study achieved an NRE of 97.5 +/- 2.2% and effluent total inorganic nitrogen (TIN) of less than 2.0 mg/L using enhanced ED-synergized anammox for real municipal wastewater treatment.
Article
Environmental Sciences
Bingxin Li, Ruochen Wang, Weiwei Zuo, Yi Peng, Dong An, Liang Zhang, Zheng Ge
Summary: A lab-scale ceramic membrane bioreactor (MBR) with an active membrane-fouling control system was developed for the partial nitrification (PN) process. The in situ membrane cleaning method was used for uninterrupted removal of contaminants on the membrane surface. The device increased critical flux, reduced gel layer resistance (R-g), and internal resistance (R-i) of the flat-sheet ceramic membrane by inhibiting cake layer formation. In long-term experiments, nitrite oxidizing bacteria (NOB) were successfully suppressed, achieving high nitrite accumulation rate (NAR) of up to 90.09%. The maintained balance between effluent NO2--N/NH4+-N ratios would promote the proliferation of Anammox bacteria and the autotrophic nitrogen removal (ANR) process. Moreover, in situ cleaning significantly reduced energy input from aeration and ensured stable PN performance by avoiding over aeration.
Article
Engineering, Environmental
Yandong Yang, Yongzhen Peng, Jun Cheng, Shujun Zhang, Changqing Liu, Liang Zhang
Summary: A novel two-stage aerobic granular sludge (AGS) system was developed for municipal wastewater treatment, achieving high removal efficiencies of phosphorus (91%) and nitrogen (81%) with a low influent carbon/nitrogen ratio. The high nutrient removal was attributed to microbial segregation in the two SBRs. The first reactor promoted enhanced biological phosphorus removal (EBPR) with the high abundance of polyphosphate-accumulating organisms (Candidatus Accumulibacter 15.3%), while the second reactor removed residual ammonium via partial nitritation/ anammox (PN/A). The system also facilitated sludge maintenance and reduced settling time, providing opportunities for resource and bioenergy recovery.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Xiyue Zhang, Xiyao Li, Liang Zhang, Yongzhen Peng
Summary: Intermittent aeration is an innovative approach to enhance nitrogen removal in low carbon-to-nitrogen ratio municipal sewage, providing an efficient strategy for the continuous plug-flow AOA process.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Zhaoyang Li, Liang Zhang, Yongzhen Peng, Jialin Li
Summary: This study investigated the relationship between the performance and ecological features of a one-stage partial nitritation and anammox system disturbed by oxygen. The disturbance resulted in an irreversible deterioration of nitrogen removal rate and reduced richness and evenness of the microbial community. Additionally, the community structure changed and 234 operational taxonomic units were depleted. The study highlights the importance of ecological features in diagnosing, predicting, and optimizing the performance of partial nitritation and anammox systems.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Xiaofei Gong, Feng Hou, Hongtao Pang, Yuanyuan Guo, Qiong Zhang, Xiyao Li, Liang Zhang, Yongzhen Peng
Summary: This study achieved stable and efficient nitrogen removal through a zero-external carbon Partial Nitritation/Anammox combined with in-situ sludge Fermentation-Denitrification process under decreased temperatures. The findings show the resilience of anammox to lower temperatures and highlight the importance of sludge reduction and organic recovery for enhanced denitrification.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)