Article
Agricultural Engineering
Susan N. James, Arya Vijayanandan
Summary: An anoxic-aerobic-anoxic process was established in a sequencing batch reactor to simultaneously remove organic carbon and nitrogen from wastewater. The study found that the optimum conditions for the process were achieved with a dissolved oxygen level of 1.5 mg/L and 1 hour pre-anoxic and post-anoxic periods. Under these conditions, the removal efficiencies of TOC, NH4+-N, and TN were 98.76%, 98.52%, and 88.23% respectively. Breakpoints in the pH, DO, and ORP curves provided insights into the biochemical reactions occurring in the reactor. Inhibition studies revealed that nitrogen removal pathways such as heterotrophic nitrification or direct conversion contributed to the removal of 27.69% of NH4+-N, while aerobic denitrification accounted for the removal of 20.55% of TN. Microbial community analysis confirmed the presence of heterotrophic nitrifiers and aerobic denitrifiers. The study emphasized the benefits of the varied redox conditions provided by limited aeration for nitrogen removal, leading to reduced energy usage and operating costs.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Weihua Zhao, Meixiang Wang, Meng Bai, Zhaoshuo Tian, Shanyun Wang, Zhongwei Wang
Summary: In this study, DEAMOX technology was successfully applied in an A/O-SBBR system to improve nitrogen removal from real low-carbon/nitrogen domestic wastewater. Excellent nitrification performance was achieved in the N-SBBR, while DEAMOX was achieved in the An-SBBR. The addition of anammox bacteria resulted in an improvement in total inorganic nitrogen removal efficiency.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Chao-Qun Zhou, Hang-Kun Gu, Chun-Hai Wei, Hong-Wei Rong, How Yong Ng
Summary: In this study, a low-cost hybrid process of hydrolysis-acidification and alternately anoxic/oxic sequencing batch reactor (HA + A/O-SBR) with synchronous coagulation was optimized for pre-treated dyeing and finishing wastewater (DFW) to meet the stringent direct discharge standard in China. The optimized process achieved effective VFAs accumulation and NH4+-N conversion from organic nitrogen, and produced effluent that met the direct discharge standard.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Agricultural Engineering
Jia Li, Lei Zheng, Changbing Ye, Zhiming Zhou, Baosen Ni, Xiaomei Zhang, Hong Liu
Summary: A hybrid system called D-A(2)MBBR was established by integrating dual-anaerobic-anoxic/oxic and moving bed biofilm reactor. This system achieved stable removal of nutrients and provided protection against organic loading shocks.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Chemical
Yu Huang, Yongzhen Peng, Donghui Huang, Jiarui Fan, Rui Du
Summary: This study developed a promising method for mainstream nitrogen removal from carbon-limited domestic wastewater, achieving efficient nitrogen removal and high total nitrogen removal rate.
Article
Engineering, Environmental
Abaynesh B. Fanta, Abhilash M. Nair, Sveinung Saegrov, Stein W. Osterhus
Summary: The study investigated the performance of a sequencing batch moving bed biofilm reactor for biological P removal in diluted municipal wastewater with VFA dosing on weekdays and without VFA dosing on weekends. Results showed that low temperature and low VFA could suppress the performance of phosphate accumulating organisms, and high EPS production might hinder the activity of PAOs and lead to thick biomass growth in the system.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Vladimir E. Burov, Jianzheng Li, Jia Meng
Summary: A lab-scale hybrid anoxic-oxic biofilm reactor (HAOBR) was constructed to treat domestic wastewater, showing increased removal efficiency of COD, NH4+ and TN with higher reflux ratio, especially at 300%. The high nitrogen removal at 300% reflux ratio is mainly attributed to the cooperation of nitrification, denitrification, and anammox.
WATER ENVIRONMENT RESEARCH
(2021)
Article
Agricultural Engineering
Qiulai He, Xiaohui Yan, Zhidong Fu, Yihang Zhang, Peng Bi, Xingliang Mo, Peng Xu, Jingwei Ma
Summary: This study investigated the application of an anaerobic/aerobic/anoxic system for simultaneous nitrification, denitrification, and phosphorus removal to treat low-strength wastewater. The results demonstrated the rapid start-up and satisfactory treatment performance of the conventional activated sludge system. The analysis of bacterial community dynamics and nitrogen metabolism pathway provided insights into the removal mechanisms.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Chao Xing, Jinmei Wen, Wentao Li, Jing Shi, Sheng Wang, Zhengwen Xu
Summary: Organic phosphorus pollution control and phosphorus resource recycling are crucial for ecological health and sustainable development. The integration of the Fe2+/H2O2-Strengite method in an airlift reactor offers an efficient strategy for removing and recovering phosphorus from organic phosphorus contaminations, resulting in valuable recovery products and contributing to sustainable phosphorus resource management.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Qianwen Sui, Fei Di, Junya Zhang, Hui Gong, Li'an Jiang, Yuansong Wei, Jie Liu, Jia Lin
Summary: This study confirmed the feasibility of anaerobic ammonia oxidation as a tertiary nitrogen removal process, and identified the main nitrogen removal pathway using anammox in an upflow fixed-bed reactor. It also investigated the cooperation mechanism among AOA, AOB, and AnAOB in the inner-layer of biofilm in the reactor.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Libing Chu, Pengyuan Ding, Mingcong Ding
Summary: Microaerobic hydrolysis and acidification (MHA) is an effective pre-treatment method for industrial wastewater, increasing hydrolysis-acidification rate and inhibiting the production of toxic gas H2S. MHA treatment guarantees the stability and efficiency of wastewater treatment systems, even with fluctuations in organic loads.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
G. Srivastava, A. Rajpal, A. Khursheed, A. K. Nadda, V. K. Tyagi, A. A. Kazmi
Summary: In addition to many other well-documented factors, local conditions are rudimentary conditions of sharp change observed in wastewater characteristics from place to place. The monitoring in India's Roorkee city revealed that the wastewater treatment system achieved efficient removal of biodegradable chemical oxygen demand, nitrogen, and phosphorus.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Ya-nan Luan, Yue Yin, Gongfa Chang, Feng Zhang, Changqing Liu
Summary: This study investigates the impact of anaerobic duration on phosphorus removal in the reversed AAO process. The results show that the amount of released P and stored PHAs can be controlled by different anaerobic durations, but higher stored PHAs do not guarantee higher P removal efficiency. Additionally, extending the anaerobic duration has a significant effect on microbial activity, and the highest P removal efficiency is achieved at an anaerobic duration of 4 hours.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Agricultural Engineering
Bo Hu, Xin Gu, Yilin Wang, Juntong Leng, Kai Zhang, Jianqiang Zhao, Pei Wu, Xiaoling Li, Chengjie Wan, Jingtong Xu
Summary: The study found that an appropriate intensity of static magnetic field can improve the performance and total nitrogen removal efficiency of an anoxic/oxic sequencing batch reactor, increase NADH content and ETSA activity. However, excessive magnetic field intensity may lead to changes in microbial communities and negative effects on microbial metabolism.
BIORESOURCE TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Yingying Cai, Hongnan Yang, Jiaxin Liu, Dingdong Zuo, Liangwei Deng
Summary: This study compared the performance of sequencing batch reactor (SBR) and anoxic/oxic process (A/O) in treating digested effluent of swine wastewater. The results showed that A/O achieved higher removal efficiencies of NH4+-N and TN when the proportion of added raw wastewater was low, while SBR performed better when the proportion was high. Sludge activity tests and microbial community analysis confirmed the differences in the two processes.
JOURNAL OF CLEANER PRODUCTION
(2022)