Article
Engineering, Environmental
Meina Hu, Xiaojing Liu, Tao Ya, Junyu Liu, Minglu Zhang, Xiaohui Wang
Summary: The effects of different dissolved oxygen (DO) conditions (0.3 and 1.0 mg/L) on microbial interactions in the partial nitrification/anammox (PN/A) process were investigated. High DO concentration (1.0 mg/L) inhibited anammox bacteria activity while enhancing nitrite oxidation bacteria (NOB) activity in the PN/A reactor. The presence of 1.0 mg/L DO promoted the abundance of NOB and some heterotrophic microorganisms, while decreasing the abundance of ammonia oxidizing bacteria and anammox bacteria. The changes in microbial interactions under 1.0 mg/L DO may lead to deterioration in nitrogen removal.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Jialin Li, Yongzhen Peng, Shenhua Yang, Shuai Li, Wanyi Feng, Xiyao Li, Qiong Zhang, Liang Zhang
Summary: By utilizing optimal organics management, a hybrid autotrophic-heterotrophic denitrification process was successfully developed to treat sewage-like wastewater, achieving a stable process and high total nitrogen removal rate, with the potential for direct integration of anammox into sewage treatment.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Chemical
Miyoko Waki, Chikako Ishimoto, Ryu Suto, Takafumi Nagamine, Toshimi Matsumoto, Hirohide Uenishi, Tomoko Yasuda, Yasuyuki Fukumoto
Summary: Spontaneous enrichment of anammox bacteria occurred in swine wastewater treatment facilities, where particular species thrived under low dissolved oxygen levels. This indicates that anammox treatment could be a viable method for nitrogen removal in swine wastewater.
Article
Engineering, Environmental
Limin Lin, Steven Pratt, Zhiheng Li, Liu Ye
Summary: The study revealed that adapting freshwater Anammox bacteria to saline environments can efficiently remove inorganic nitrogen. During the salt adaptation process, significant changes in microbial communities were observed, and the evolution from low salt-tolerance species to high salt-tolerance species is crucial for the recovery of Anammox activity.
Article
Environmental Sciences
Bensheng Su, Qi Liu, Huili Liang, Xiaohua Zhou, Yuanjie Zhang, Guangqing Liu, Zhuangming Qiao
Summary: This study investigated the rapid start-up and operation of a simultaneous partial nitrification, anammox, and denitrification (SNAD) process using synthetic wastewater in a novel upflow microaerobic membrane bioreactor (UMMBR). The results showed that the UMMBR with high sludge concentration and upflow mode facilitated the establishment of anaerobic zones for anammox, and the presence of carmine granules indicated the occurrence of the SNAD process. Anammox bacteria and short-cut denitrification bacteria played important roles in total nitrogen removal. High-throughput sequencing analysis revealed the microbial community structure of nitrifying organisms.
Article
Biotechnology & Applied Microbiology
Carla Eloisa Diniz dos Santos, Rachel Biancalana Costa, Camila Abreu Borges Silva Rabelo, Antonio Djalma Nunes Ferraz Junior, Gabriela Felix Persinoti, Eloisa Pozzi, Eugenio Foresti, Marcia Helena Rissato Zamariolli Damianovic
Summary: The microbial community in a structured-bed reactor was able to adapt to different organic and nitrogen loads and shift according to changes in the C/N ratio, with no impact on reactor performance in terms of COD and Total-N removal. Under different C/N ratios, different bacterial families prevailed, including those capable of using organic matter, ammonia oxidizers, aerobic denitrifiers, and Anammox bacteria. The stratification of aerobic, anoxic, and anaerobic zones enabled the establishment of various nitrogen degradation pathways within the reactor.
BIOPROCESS AND BIOSYSTEMS ENGINEERING
(2021)
Article
Agricultural Engineering
Zhuo Zhu, Liyuan Zhang, Xiyao Li, Qiong Zhang, Shuying Wang, Yongzhen Peng
Summary: Efficient nitrogen removal from municipal wastewater was achieved using a partial nitrification anammox (PNA) pure biofilm system with anaerobic/oxic/anoxic operation. The nitrogen removal efficiency reached 93.3%. By controlling ultra-low dissolved oxygen levels, dominant nitrite-oxidizing bacteria (NOB) were favored, with ammonia-oxidizing bacteria (AOB) dominant on the carrier surface and anammox bacteria dominant inside the carrier. Intercalary NOB were inhibited due to restricted oxygen transfer. This study provides a new approach for PNA in a biofilm system.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yuchun Yang, Mohammad Azari, Craig W. Herbold, Meng Li, Huaihai Chen, Xinghua Ding, Martin Denecke, Ji-Dong Gu
Summary: This study revealed the survival strategies of anammox bacteria in complex ecosystems by combining metagenomics with in situ metatranscriptomics, advancing our understanding of the application of anammox bacteria in full-scale wastewater treatment systems.
Article
Engineering, Multidisciplinary
ShengLi Du, PeiXi Chen, HongGui Han, JunFei Qiao
Summary: This article studies the dissolved oxygen (DO) concentration control problem in wastewater treatment process (WWTP). Unlike existing control strategies, a different control framework is developed. An intelligent control method of DO concentration based on reinforcement learning (RL) algorithm is presented to resolve the DO concentration control problem. By using the deep deterministic policy gradient (DDPG) algorithm, the DO concentration of the fifth tank in the activated sludge reactor can be adjusted dynamically. Additionally, by designing two different reward functions and analyzing the relationships among effluent quality, energy consumption, and DO concentration, the target of energy-saving and emission-reducing is achieved. The simulation results indicate that the designed control method can reduce energy consumption while ensuring that the effluent quality meets the specified standards.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Environmental Sciences
Hong-Duck Ryu, Ji-Hyoung Park, Yong Seok Kim
Summary: This study proposed an improved dilution technique that effectively determines the dilution ratios for raw wastewater and WWTPs effluent samples in BOD5 testing, leading to more accurate results. The research found that within the optimal DOCR range, the relative error of BOD5 values was small, and there was a high correlation between sample dilution ratios and BOD5 values.
Article
Agricultural Engineering
Binjuan Li, Yi Wang, Wenhuai Wang, Xiaozhong Huang, Xiaomei Kou, Shizhang Wu, Tian Shao
Summary: By shortening the hydraulic retention time, it is possible to effectively restart the continuous biofilter anammox reactor and efficiently remove low-concentration nitrogen wastewater.
BIORESOURCE TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Junjiang Chen, Xingxing Zhang, Xiaonong Zhang, Zixuan Zhu, Yiling Wu, Chaochao Wang, Tianning Cai, Xiang Li, Peng Wu
Summary: This study developed a novel integrated process for the treatment of municipal wastewater, achieving high nitrogen removal efficiency and low effluent nitrogen concentration. The process combines nitrification, partial denitrification, and anammox, and demonstrates promising prospects for energy-efficient wastewater treatment.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Hong Wang, Guanlong Yu, Weining He, Chunyan Du, Zhengyu Deng, Dongbo Wang, Min Yang, Enzhe Yang, Yaoyu Zhou, Eli Hendrik Sanjaya, Hong Chen
Summary: A novel dissolved oxygen-differentiated airlift internal circulation reactor was developed in this study to enhance autotrophic nitrogen removal efficiency from wastewater, achieving high total nitrogen removal efficiency of 80% within 30 days and stable maintenance over 200 days. The reactor optimized nitritation and anammox reactions, leading to enhanced ANR performance.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Chemistry, Multidisciplinary
Qianyun Tang, Dandan Wang, Jinhui Cui, Yiheng Zhang, Junyang Mei, Jing Du, Anyue Xia, Qian Sun, Dan Luo, Baosan Han, Mingzhe Gan, Peifeng Liu
Summary: This study presents a novel microfluidic platform for precise and flexible control of oxygen concentrations in microbial suspension culture. The platform demonstrates unique capabilities for spatiotemporal gas control and detection, allowing for applications in screening, studying, and culturing industrial or niche-specific environmental microbiomes.
Article
Agricultural Engineering
Guocheng Ma, Deshuang Yu, Jianhua Zhang, Yuanyuan Miao, Xinchao Zhao, Jiawen Li, Yu Zhang, Guoqing Dong, Jiaru Zhi
Summary: This study verified the feasibility of simultaneous partial nitrification, anammox, denitrification and fermentation process under intermittent aeration in a single reactor, and explored the impact of dissolved oxygen (DO) on the synergy between fermentation and nitrogen removal. An advanced nitrogen removal efficiency of 92.8% and a low observed sludge yield of 0.0268-0.1474 kgMLSS/kgCOD were achieved. The in-situ test showed the possibility of simultaneous partial denitrification, anammox, and fermentation. When DO increased from 0.1-0.3 to 0.4-0.6 mg/L, the nitrogen removal efficiency increased while sludge reduction was negatively affected.
BIORESOURCE TECHNOLOGY
(2023)
