Article
Agricultural Engineering
Mohamad-Javad Mehrani, Mohammad Azari, Burkhard Teichgraber, Peter Jagemann, Jens Schoth, Martin Denecke, Jacek Makinia
Summary: This study aimed to optimize mainstream deammonification in an integrated fixed-film activated sludge pilot plant under natural seasonal temperature variations. The effect of temperature on the performance was evaluated and the correlation of performance parameters was investigated. Optimizing intermittent aeration significantly increased the N-removal rate and N removal efficiency. This study's findings are important for enhancing the efficiency of mainstream deammonification.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Myeonghwa Park, Jeongmi Kim, Teaho Lee, You-Kwan Oh, Van Khanh Nguyen, Sunja Cho
Summary: The study found that high salinity inhibits Anammox microbial activity, but high nitrogen removal efficiency can still be achieved at 2% salinity. In high salinity environments, the abundance of Anammox bacteria increases, replacing heterotrophic denitrifying bacteria.
Article
Engineering, Environmental
Jeongmi Kim, Jaecheul Yu, Taewon Kwon, Wonyoung Choi, Lucky Caesar Direstiyani, Soyeon Jeong, Yeonju Kim, Seongjae Park, Hyokwan Bae, Taeho Lee
Summary: This study aims to enhance the stability of the SSD process for treating moderate-strength NH4+-N wastewater by integrating a real-time monitoring system strategy that controls free ammonia (FA) through pH and NH4+-N monitoring, resulting in optimal dissolved oxygen (DO) and sufficient FA levels to inhibit selective nitrite oxidizing bacteria (NOB) activity. The research findings highlight the important role of denitrifying bacteria in improving nitrogen removal performance under long-term low DO and optimal FA conditions.
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
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
Gabriela Bonassa, Alice Chiapetti Bolsan, Bruno Venturin, Marina Celant De Pra, Fabiane Goldschmidt Antes, Camila Ester Hollas, Gracielle Johann, Arlei Coldebella, Airton Kunz
Summary: The study focused on exploring the inhibition of bacteria pathways by high ammonia concentrations during the deammonification process. A new mathematical model was proposed to predict specific bacterial activity decrease and nitrite accumulation, as well as the affinity and inhibition of microorganisms by substrate. The model showed significant predictive capabilities for a wide range of ammonia concentrations in high-ammonia swine wastewater treatment reactors.
BIORESOURCE TECHNOLOGY
(2021)
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
Microbiology
Dheeraja Cheenakula, Kai Griebel, David Montag, Markus Groemping
Summary: This study developed a conceptual model of a mainstream deammonification plant for nitrogen removal in municipal wastewater treatment plants. The energy-saving potential, nitrogen elimination performance and construction-related costs of mainstream deammonification were compared to a conventional plant model. The results showed that an additional treatment step prior to mainstream deammonification is advantageous.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Martin Hjorth Andersen, Lisette Thomsen, Mikkel Stokholm-Bjerregaard, Susan Hove Hansen, Mads Albertsen, Per Halkjaer Nielsen, Soren Eriksen
Summary: The partial nitritation/anammox process is a popular approach for removing nitrogen from sidestreams, but it requires extensive surveillance and monitoring due to its sensitivity to disturbances. In this study, we utilized online sensor data and Nanopore DNA sequencing to monitor the microbial community and detect system disturbances in two full-scale deammonification reactors over a year. DNA surveillance revealed unexpected variations in anammox bacteria, and the composition and dynamics of the surrounding community indicated causes for occasional process disturbances. Monitoring the ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) could potentially optimize reactor operation. The use of frequent DNA sequencing was found to be an important supplement to online sensor data for process surveillance and control.
Article
Engineering, Environmental
Jianning Ding, Hui Gong, Shunyu Wang, You Xu, Enhui Xu, Dianhai Yang, Guowei Gu, Xiaohu Dai
Summary: The proposed PN-MF-A process showed higher TNRR and more stable operation compared to the C-PN-A process. It effectively prevented microbial transfer from the nitritation stage to the anammox stage, reducing inhibitory effects on anammox activity in treating reject water.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Review
Environmental Sciences
Parin Izadi, Parnian Izadi, Ahmed Eldyasti
Summary: Deammonification process, characterized by partial nitritation-anammox, is a favorable and innovative method for treating nitrogen-rich wastewater with reduced oxygen and carbon requirements at high nitrogen loadings. The process involves anaerobic ammonium oxidation bacteria in symbiosis with ammonium oxidizing bacteria, showing potential for sustainable and energy-neutral municipal wastewater treatment. However, further investigation is needed to assess the feasibility of applying deammonification in mainstream treatment processes.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Tao Xiang, Hong Liang, Dawen Gao
Summary: The AnAOB granular sludge reactor showed faster recovery and higher nitrogen removal performance compared to the AOB-AnAOB granular sludge reactor after long-term storage, indicating better application potential and more active characteristics of aggregation metabolism.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agricultural Engineering
Sike Wang, Heng Yu, Qingxian Su, Jiane Zuo
Summary: This study found that the PN/A reactor achieved satisfactory nitrogen removal rate when treating THP-AD reject water, while maintaining a balanced symbiotic relationship between HB and functional groups.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Yunzhi Qian, Yanmei Ding, Huaji Ma, Yongzhi Chi, Hongying Yuan, Yu-You Li, Sufeng Tian, Bowen Zhang
Summary: A novel internal circulation contact oxidation membrane bioreactor (ICCOMBR) was constructed to investigate a three steps startup strategy of single-stage partial nitritation-anammox (SPNA) system. The SPNA system achieved stable nitrite accumulation rate and high total nitrogen removal efficiencies.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Shunyu Wang, Hui Gong, Jianning Ding, Enhui Xu, Rongrong Cui, Dianhai Yang, Guowei Gu, Xiaohu Dai
Summary: The study demonstrates that the unbiodegradable components of organic sludge anaerobic digestion reject water have unbalanced inhibitory effects on anammox activity. Organic substances with molecular weights between 10 kDa and 30 kDa cause more severe inhibition on anammox activity.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
