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
Yong-Ze Lu, Yue Yin, Li-Ran Xu, Xin Li, Guang-Can Zhu
Summary: The study on different carbon sources in a sequencing batch reactor revealed that propionate enhances phosphorus removal while acetate has a higher efficiency in nitrogen removal. Acetate shows better performance in total nitrogen and total phosphorus removal, making it a more suitable choice for the SND-DPR coupled system.
JOURNAL OF ENVIRONMENTAL ENGINEERING
(2021)
Article
Environmental Sciences
Lingna Xu, Ji Zhao, Jimiao Wang, Ruihuan Gu, Yong Qu, Jianhui Yin, Deshuang Yu, Zhengda Yu, Juan Feng, Xiaoxia Wang
Summary: This study aimed to verify whether AOA could be established in an ongoing anaerobic-oxic (AO) system. Contrary to expectations, under AOA mode, little nitrate reduction indicated the failure of endogenous denitrification (ED).Additionally, within the long-term AOA operation, nitrification weakened due to low dissolved oxygen and long unaerated duration.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Biotechnology & Applied Microbiology
Ruifei Wang, Chuanzhen Yang, Hu Hu, Qingxiang Yang, Bingbing Du
Summary: This study focused on the effects of variations in COD, P, and N concentrations on biological phosphorus removal and the enrichment of PAOs and DPAOs in an anaerobic-aerobic-anoxic SBR. Results showed that nutrient concentrations significantly affected the abundance and distribution of functional bacteria and genes related to P and N removal, with potential PAOs and DPAOs being clearly enriched at different operation phases.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(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
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
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
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
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
Engineering, Environmental
Xiao'ai Huo, Linjiang Yuan, Qian Wang, Dacheng Luo, Ru Wang, Yaping Nan
Summary: A novel biological phosphorus removal process using starch as carbon source in anoxic-aerobic SBR was discovered, with nitrate playing a potentially beneficial role in promoting phosphorus uptake efficiency by enriching lactic acid-producing bacteria. Different bacterial community structures in the two systems also impacted phosphorus removal efficiency.
ENVIRONMENTAL ENGINEERING SCIENCE
(2021)
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
M. Sarvajith, Y. V. Nancharaiah
Summary: This study investigated the metabolic potential of aerobic granular sludge (AGS) for simultaneous removal of tellurite, COD, ammonium-nitrogen and phosphorus. The results showed that AGS could efficiently convert tellurite to biogenic elemental tellurium and had good pollutant removal and metal immobilization capabilities. The findings have important implications for metal-laden waste management and metal recovery applications.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Thayse Nathalie Ferro, Karina Querne de Carvalho, Mateus Xavier de Lima, Ana Claudia Barana, Cristiane Kreutz, Olga Regina Gauza, Fernando Hermes Passig
Summary: This study focuses on investigating wastewater treatment with a simultaneous removal of nitrogen and phosphorus in the AOA system. The results show that the best performance of the system was achieved in Stage 3, with reductions in HRT and without external carbon source addition. The highest phosphorus removal efficiency was observed in the anoxic reactor, indicating denitrifying phosphorus removal by DNPAOs.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Engineering, Environmental
Xiaolin Zhou, Yuan Zhang, Zihao Li, Pengcheng Sun, Xiaoliang Hui, Xing Fan, Xuejun Bi, Tang Yang, Shujuan Huang, Lihua Cheng, Harsha Ratnaweera
Summary: The application of a novel two-stage anoxic/oxic-moving bed biofilm reactor (TS-A/O-MBBR) was validated in a full-scale municipal wastewater treatment plant (WWTP), and its working mechanism for biological nitrogen removal was analyzed. The results showed that the TS-A/O-MBBR process could effectively remove organic matter and nitrogen, meeting strict emission standards.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Review
Engineering, Environmental
Kunjie Hou, Zhoujie Pi, Fubing Yao, Bo Wu, Li He, Xiaoming Li, Dongbo Wang, Haoran Dong, Qi Yang
Summary: Iron-based materials are widely utilized as effective activators in persulfate-based oxidation processes. However, there are ambiguities and controversies surrounding the activation mechanisms by these materials. This review clarifies these theories, analyzes electron transport pathways, activator evolution, and identifies knowledge gaps and future research prospects in this field. It significantly enhances understanding and provides insights for researchers using iron-based materials for persulfate activation.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Mingting Du, Xuran Liu, Dongbo Wang, Qi Yang, Abing Duan, Hong Chen, Yiwen Liu, Qilin Wang, Bing-Jie Ni
Summary: This study delves into the degradation of capsaicin in anaerobic co-digestion, revealing that capsaicin inhibits methane production and affects the activity of anaerobic microbes, particularly impacting hydrolysis, acidogenesis, and methanogenesis.
Article
Engineering, Environmental
You Wu, Xiaoming Li, Hui Zhao, Fubing Yao, Jiao Cao, Zhuo Chen, Xiaoding Huang, Dongbo Wang, Qi Yang
Summary: MXenes, as emerging 2D transition metal carbides and nitrides, show great potential for environmental applications due to their unique properties such as hydrophilicity, metallic conductivity, versatile surface chemistry, and 2D layered atomic structure. Various design strategies can improve the performance of MXenes in environmental applications, and a targeted description of their properties and abilities for specific environmental applications is provided. Challenges and perspectives in this field are proposed to facilitate the further development of MXenes in environmental applications.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Huanyu Yin, Qi Yang, Fubing Yao, Zhoujie Pi, Yu Zhong, Li He, Kunjie Hou, Jing Fu, Shenjie Chen, Ziletao Tao, Dongbo Wang, Xiaoming Li
Summary: A novel in-situ N-doped carbon nanoparticles were prepared from N-rich polyaniline and used as metal-free peroxydisulfate activator for efficient bisphenol A degradation. The catalytic activity of NCNs was closely related to their structure-composition, with higher graphitic N content and larger BET surface area being beneficial for the generation of reactive oxygen species.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Engineering, Environmental
Zhoujie Pi, Kunjie Hou, Fubing Yao, Li He, Shengjie Chen, Ziletao Tao, Puyu Zhou, Dongbo Wang, Xiaoming Li, Qi Yang
Summary: NHGBC-800 showed excellent adsorption performance and PDS activation ability, allowing for simultaneous removal of organic contaminants and regeneration of the adsorbent. Furthermore, NHGBC-800 maintained good performance under different pH conditions and in the presence of inorganic anions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Xiaoming Li, Kexin Sui, Jiamin Zhang, Xuran Liu, Qiuxiang Xu, Dongbo Wang, Qi Yang
Summary: The study found that the maximum hydrogen yield from waste activated sludge increased with the concentration of Rhamnolipid (RL) up to 0.10 g/g TSS. However, further enhancement to 0.12 g/g TSS slightly reduced the hydrogen production. The research suggested that RL facilitated the solubilization of waste activated sludge and improved the proportion of biodegradable substances available for hydrogen production.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Qi Huang, Kun Luo, Zhoujie Pi, Li He, Fubing Yao, Shengjie Chen, Kunjie Hou, Yujie Liu, Xiaoming Li, Qi Yang
Summary: In this study, a low-cost and high-efficiency phosphate adsorbent ZrBC was successfully synthesized and demonstrated strong adsorption ability for low-concentration phosphate in water. The adsorption process was mainly chemical adsorption and single-layer adsorption, described well by pseudo-second-order and Langmuir isotherm models. ZrBC showed superior treatment capacities for simulated secondary effluents.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Li He, Fubing Yao, Yu Zhong, Chang Tan, Kunjie Hou, Zhoujie Pi, Shengjie Chen, Xiaoming Li, Qi Yang
Summary: In this study, a binder-free composite cathode with low-energy consumption and long-term stability was successfully synthesized. Compared with monometallic composite cathode, this composite cathode exhibited better performance in NO3- removal and energy consumption, and maintained good electrocatalytic performance and stability in a wide range of conditions.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Kunjie Hou, Zhoujie Pi, Fei Chen, Li He, Fubing Yao, Shengjie Chen, Xiaoming Li, Dongbo Wang, Haoran Dong, Qi Yang
Summary: The internal Fe2+/Fe3+ cycle plays a crucial role in activating PMS by iron-based materials and producing ROS for the degradation of organic pollutants. This study highlights the significant contribution of dissolved Fe2+ and dissolved sulfur (-II) to PMS activation and organic pollutant degradation, emphasizing the importance of sulfur in these processes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Physical
Zhoujie Pi, Kunjie Hou, Fubing Yao, Li He, Shengjie Chen, Yukui Fu, Xiaoming Li, Qi Yang
Summary: A nitrogen-rich hierarchical porous graphite carbon (NHC) was synthesized with different hydrothermal carbonization temperatures, and the NHC800 exhibited optimal adsorption and catalytic activation of peroxydisulfate (PDS) for tetracycline (TC) removal. The investigation of catalytic mechanism revealed the active redox sites and electron-transfer process. The study also proposed a degradation pathway and assessed the acute toxicity of degradation intermediates.
Article
Engineering, Environmental
Kunjie Hou, Zhoujie Pi, Fei Chen, Li He, Fubing Yao, Shengjie Chen, Xiaoming Li, Haoran Dong, Qi Yang
Summary: The efficiency of Fe(III) activation of peroxymonosulfate (PMS) can be improved by introducing trace amounts of S2-, leading to enhanced degradation of bisphenol A (BPA) and increased utilization efficiency of PMS. The primary reactive oxidant species in this system is identified as FeIVO2+, and other reactive species such as center dot OH, SO4 center dot-, O2 center dot-, and 1O2 are also involved in the degradation of BPA. The PMS/Fe(III)/S2- system shows good applicability under a wide pH range and high resistance to various interfering substances.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Correction
Environmental Sciences
Kunjie Hou, Zhoujie Pi, Fei Chen, Li He, Fubing Yao, Shengjie Chen, Xiaoming Li, Dongbo Wang, Haoran Dong, Qi Yang
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Kun Luo, Chen Yang, Xue Li, Ya Pang, Qi Yang
Summary: This study investigated the catalytic activity of MnO2-loaded biochar (BC) with different MnO2 polymorphs for ciprofloxacin (CIP) removal. The results showed that BC-alpha-MnO2 exhibited superior CIP removal compared to BC-beta-MnO2 and BC-delta-MnO2. The pH value and desorption experiments confirmed the contributions of both adsorption and degradation to CIP removal. Radical quenching experiments and electron paramagnetic resonance tests demonstrated the existence of reactive oxidation species (ROS) in BC and MnO2-loaded BCs.
JOURNAL OF ENVIRONMENTAL ENGINEERING
(2022)
Article
Agricultural Engineering
Xiaodong Zhang, Xiaoding Huang, Xiaoming Li, Jiamin Zhang, Mengge Tang, Xuran Liu, Dongbo Wang, Qi Yang, Abing Duan, Junwu Liu
Summary: This study proposed a citric acid (CA) treatment strategy for improving short-chain fatty acids (SCFAs) production from waste activated sludge (WAS), with the optimum SCFAs yield reaching 384.4 mg COD/g VSS with 0.08 g CA/g TSS addition. The biodegradation of CA contributes to the yield of total SCFAs, especially acetic acid. The presence of CA enhances sludge decomposition, fermentation substrate biodegradability, and the abundance of fermenting microorganisms.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Xin-Jia Chen, Chang-Wei Bai, Yi-Jiao Sun, Xin-Tong Huang, Bin-Bin Zhang, Yi-Shuo Zhang, Qi Yang, Jing-Hang Wu, Fei Chen
Summary: In the realm of wastewater treatment, the combined use of ferrate (Fe(VI)) and peracetic acid (PAA) as oxidants shows enhanced efficacy. However, the underlying mechanisms of their interaction at different pH levels and pollutant types are still unclear. This study investigates the complex oxidation interplay among Fe(VI)-PAA, Fe(VI)-H2O2, and standalone Fe(VI) systems, revealing that the Fe(VI)-PAA system outperforms its counterparts in degrading sulfamethoxazole pollutant at a pH of 9.0. The behavior of active species shifts with pH variations, indicating distinct degradation pathways. Understanding the role of pH is crucial in organic wastewater decontamination.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
