Article
Agricultural Engineering
Xingxing Zhang, Peng Wu, Lezhong Xu, Liping Ma
Summary: This study proposed a novel simultaneous partial nitritation, denitratation and anammox process for efficient total nitrogen removal. Controlling aerobic duration and dissolved oxygen concentration could enhance microbial activity and stable suppression of nitrite-oxidizing bacteria.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Enzhe Yang, Jing Chen, Ke Liu, Jianhong Jiang, Hong Wang, Sha Wu, Lixiu Shi, Jingyi Jiang, Eli Hendrik Sanjaya, Hong Chen
Summary: This study constructed a single-stage partial nitritation-anammox and denitrification system and operated it continuously for 364 days. The system showed efficient and stable operation, with an average total nitrogen removal efficiency of 87.2%. The nitrogen removal pathway in the system changed from autotrophic nitrogen removal to nitrification-denitrification. Overall, the system demonstrated the potential for efficient single-stage nitrogen removal.
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
Depeng Wang, Junshi Tao, Fuqiang Fan, Ronghua Xu, Fangang Meng
Summary: The study introduced a novel low aeration IFAS-MBR system for treating municipal wastewater. It achieved efficient nutrient removal, stable microbial community levels, and enhanced functional robustness and performance of the system.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Haoyuan Wu, Guotian Wang, Lei Li, Zhenchao Gao, Mengyu Wang, Jin Wang, Zhongguo Zhang, Aimin Wang, Xiujun Tian, Jiuyi Li
Summary: Due to the presence of high levels of organics and nitrogen in vacuum toilet wastewater (VTW) from high-speed trains, onsite pretreatment is necessary for discharging VTW into municipal sewers. A partial nitritation process was established in a sequential batch reactor to efficiently remove nitrogen and produce effluent suitable for anaerobic ammonia oxidation. Despite the fluctuation of COD and nitrogen, the organics for nitrogen removal stabilized at 1.97 +/- 0.18 mg COD mg N-1 removed, and the effluent NO2--N/NH4+-N ratios were maintained at 1.26 +/- 0.13. The nitrogen and COD removal efficiencies were 31.8 +/- 3.5% and 65.2 +/- 5.3% for real VTW, respectively. Microbial analysis showed Nitrosomonas as the dominant autotrophic ammonium-oxidizing bacterial genus, while nitrite-oxidizing bacteria Nitrolancea was inhibited.
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
Environmental Sciences
Jiaqi Wang, Mingyue He, Yufen Li, Fang Ma, Ping Zheng, Baolan Hu
Summary: This study successfully achieved rapid enrichment of denitrifying methanotrophs using a series hollow-fiber membrane biofilm reactor for 90 days. The results showed that the series reactor effectively counteracted the inhibitory effect of dissolved oxygen on denitrifying methanotrophic archaea, resulting in a high growth rate.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
G. Senthilkumar, S. Lakshmi Sankar
Summary: This article improves the quality of domestic wastewater using micro-nanobubbles technology (MNB) in an experimental study. The effect of MNBs on water quality was analyzed through various characteristic studies, and their existence was verified through water quality tests. This article raises awareness of MNBs technology and enhances knowledge in domestic wastewater treatment.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Engineering, Environmental
Ying-yu Li, Lin Lin, Xiaowu Huang, Xiao-yan Li
Summary: This study examines the feasibility of using partial nitritationanammox (PNA) in an integrated fixed-film activated sludge (IFAS) reactor for enhanced biological nitrogen removal from saline municipal wastewater. The results show that the addition of seawater to the influent significantly affects the activity of anammox bacteria, but the addition of N2H4 can effectively facilitate the recovery and adaptation of PNA to salinity stress.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Khin July Win Thant, Nguyen Anh-Vu, Kigo Yun-Je, Kobayashi Masumi, Chettiyappan Visvanathan
Summary: Membrane-aerated biofilm reactors (MABRs) have attracted attention for their wastewater treatment performance, but face challenges with reactor design and low total nitrogen (TN) removal efficiency. This study evaluated a hybrid system of MABR integrated with an anoxic nano-biotechnological reactor filled with Granulated Nanoscale Oxyhydroxides of Fe (GNOF) media to improve nitrogen removal. The hybrid MABR-GNOF system achieved higher removal efficiencies than the MABR-only system, with an 18% increase in nitrogen removal at 12 hours of hydraulic retention time (HRT).
Article
Green & Sustainable Science & Technology
Matteo Tucci, Anna Espinoza-Tofalos, Enrico Barontini, Francesca Formicola, Paolo Bonelli, Andrea Franzetti, Maddalena Papacchini, Pierangela Cristiani
Summary: This study conducted long-term tests to evaluate the potential application of two types of microbial fuel cells in a wastewater treatment plant for monitoring anaerobic conditions. The experiment showed variable anaerobic conditions in the monitored wastewater and different microbial activity on the anode and cathode.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Environmental Sciences
Zhen Lei, Lianxu Wang, Jun Wang, Shuming Yang, Zhaoyang Hou, Xiaochang C. Wang, Rong Chen
Summary: This study demonstrates that operating at higher dissolved oxygen concentrations can effectively improve the performance of the partial nitritation reactor, enhancing ammonia oxidation and reducing nitrite accumulation simultaneously.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Zemin Li, Chaohai Wei, Ying Chen, Ben Chen, Guanglei Qiu, Jia Wan, Haizhen Wu, Shuang Zhu, Heng Zhao
Summary: The study utilized toxic compounds in coking wastewater to inhibit nitrite oxidizing bacteria, achieving stable nitritation. Results showed that controlling the organic loading rate and dissolved oxygen concentration can regulate the nitritation process, inhibiting NOB while preserving AOB activity.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Yongxing Chen, Haochuan Chen, Zhenguo Chen, Haolin Hu, Cuilan Deng, Xiaojun Wang
Summary: A novel two-stage partial nitritation-anammox process was investigated to achieve high efficiency and save operational costs for high-concentration urea wastewater treatment. The results showed that intracellular hydrolysis and persistent free ammonia inhibition on nitrite-oxidizing bacteria were key mechanisms for efficient urea removal and stable nitrogen removal. The proposed process demonstrated promising potential for sustainable development in the urea industry.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
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)
