INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Keda Zhi,Chao Yang,Yu Zheng,Runnan Zhang,Omojayogbe Toyosi E,Hong Wu,Zhongyi Jiang
Electro-Fenton is a widely used electrochemical advanced oxidation process for the treatment of refractory organic pollutants, in which O2 input is required to generate hydrogen peroxide. The aeration mode directly affects the dissolution and stability of O2 bubbles in the solution, thus the rate of degradation. Herein, membrane aeration was introduced to the electro-Fenton degradation of ciprofloxacin in which O2 was dispersed into the liquid phase in the form of microbubbles through the ceramic membrane. Microbubbles can greatly improve the gas–liquid mass transfer efficiency of unit volume O2 to obtain an ultrahigh concentration of dissolved O2 up to 46 mg/L, thus improving the reaction rate. The effects of aeration mode, applied current, membrane aperture, aeration rate, and ciprofloxacin concentration on degradation rate were studied. Compared with the conventional electro-Fenton process using plastic pipe aeration, the membrane aeration-enhanced electro-Fenton (MAEF) system achieved a significant improvement in the degradation rate, and the reaction time required to achieve a 97% degradation ratio was remarkably reduced from 4 h to 10 min. Membrane aeration is an efficient approach to facilitating heterogeneous catalysis reactions involving the gas phase.
研究领域:
环境科学
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化学工程
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水处理技术
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
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2013
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IF 4.75
Feifei Hou,Baoan Li,Minghao Xing,Qin Wang,Liang Hu,Shichang Wang
A novel composite hollow fiber membrane for membrane aerated biofilm rector (MABR) was prepared by coating L-3,4-dihydroxyphenylalanine (DOPA) on the surface of PVDF membrane. MABR process study was conducted to test the performances of the original and modified membranes for 166 days. The results indicate that coated membrane showed 2 times higher gas flux, lower water contact angle (declined from 86.5° to 52°), and significantly improved surface roughness. The modified membrane displayed an excellent MABR performance. Its COD, NH 4 + –N and TN removal efficiencies were kept above 90%, 98.8% and 84.2% during the first 4-month experiment. By tracking experiment at 0.01 MPa, to achieve COD removal efficiency of 85.9%, half an hour is required with the modified membrane, instead of 6 h using the original one. Besides, faster NH 4 + –N and TN removal at 0.01 MPa were also achieved with DOPA composite membrane.
研究领域:
环境工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Chao Wang,Hongyang Li,Bixin Wu,Jianqiang Meng
ABSTRACT Membrane Aerated Biofilm Reactor (MABR) stands out as an innovative technology for wastewater treatment. However, biofilm formation poses a significant challenge in its implementation. Surface modification emerges as a viable strategy to enhance biofilm development. In this study, biofilm formation was effectively promoted by coating polydopamine (PDA) and loading aluminum oxide nanoparticles (Al 2 O 3 NPs) onto a polypropylene (PP) hollow fiber membrane, aiming to improve wettability and potential. Results from the bacterial attachment assay demonstrated a significantly higher bacterial attachment rate on the membrane loaded with Al 2 O 3 NPs compared to PDA/PP and PP membranes. A comprehensive investigation into the MABR process was conducted, assessing both short-term and long-term (72 days) performance. In the short-term process, the Al 2 O 3 NPs-PDA modified membrane exhibited superior removal efficiency for chemical oxygen demand (COD), ammonium nitrogen (NH 4 + -N), and total nitrogen (TN) compared to other membranes. Transitioning to the long-term process, the start-up period for the Al 2 O 3 NPs (10) -PDA/PP membrane was notably shortened to 27 days, surpassing the start-up times of PP and PDA/PP membranes by 13 and 5 days, respectively. Throughout the long-term operation, when the influent COD, NH 4 + -N, and TN concentrations increased, the Al 2 O 3 NPs-PDA/PP membrane consistently maintained removal efficiency above 95%, 98%, and 85% for COD, NH 4 + -N, and TN, respectively, demonstrating excellent resistance to shock loading.
研究领域:
环境工程
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材料科学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2025
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IF 6.7
Abdallah Abdelfattah,Reham Eltawab,Ke Li,Zhong-Ting Hu,Liang Cheng
The prolonged startup period caused by slow and unstable biofilm formation remains a major barrier to large-scale application of membrane-aerated biofilm reactors (MABRs). This study developed a novel sodium alginate–assisted immobilization strategy to accelerate biofilm establishment and enhance nitrogen removal. A homogeneous mixture of sodium alginate and activated sludge was spray-coated onto plasma-treated PVDF hollow-fiber membranes, followed by CaCl₂ mist crosslinking to form a thin gel layer immobilizing active biomass. The coated MABR achieved 85 ± 5 % surface coverage within seven days—over twice that of the control—and complete ammonium oxidation (>90 %) in 10 days, reducing startup time by about 50 %. Digital microscopy and SEM revealed rapid transition from the synthetic alginate matrix to a self-sustained EPS network, while 16S rRNA sequencing confirmed enriched Nitrosomonas and Nitrospira with enhanced microbial diversity. The oxygen transfer rate initially decreased by 18 % after coating but recovered to 95 % of the original after partial scaffold dissolution, showing reversible mass-transfer adaptability. Mechanistically, the biodegradable Ca 2+ –alginate scaffold provided an initial attachment platform evolving into a stable stratified biofilm enabling simultaneous nitrification and denitrification. This study establishes a mechanistic and practical basis for biopolymer-assisted biofilm engineering toward rapid-startup, high-efficiency MABR systems.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Xiang Mei,Yihan Wang,Yang Yang,Lijie Xu,Yong Wang,Zhongwei Guo,Wentian Shen,Zimiao Zhang,Mengyuan Ma,Yang Ding,Yanyan Xiao,Xu Yang,Chengqi Yin,Wei Guo,Kang Xu,Chaofan Wang
Nitroaniline (NA) is an aniline derivative with high toxicity, potential carcinogenicity and mutagenic effects. At present, the physical, chemical and biological methods used in NA-containing wastewater treatment usually suffer from problems such as low removal efficiency, high energy consumption and secondary pollution generation. In this study, a membrane-aerated biofilm reactor (MABR) was constructed to enhance the treatment of wastewater containing o -nitroaniline (2-NA) and p -nitroaniline (4-NA). The stratified biofilm and counterdiffusion of oxygen in the MABR were conducive to NA degradation. At a lower concentration, NA was primarily removed through direct oxidative degradation in the absence of the cometabolic substrate acetic acid, while at a higher concentration, NA was predominantly removed through oxidative degradation after reduction of NA in the presence of acetic acid. With an influent NA loading of 0.120 kg/(m 3 ·d), an aeration pressure of 40 kPa and an acetic acid dosing ratio of 2.0, the 2-NA and 4-NA removal loadings reached 0.058 and 0.060 kg/(m 3 ·d), respectively. Additionally, the chemical oxygen demand (COD) and total nitrogen (TN) removal rates were 82.40 and 88.52%, respectively. The MABR technology promoted simultaneous NA degradation and nitrogen removal from NA-containing wastewater treatment, illustrating its prospects for industrial application.
研究领域:
环境工程
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水处理
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生物技术
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废水管理
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产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
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IF 8.4
Shumin Qin,Lin Deng,Yan Lin,Lang Jiang,Xilong Liu,Qian Zhang
To enhance the stability of membrane aerated biofilm reactor (MABR) and accelerate the formation of biofilm, this study introduced a symbiotic system composed of heterotrophic nitrification-aerobic denitrification (HN-AD) bacteria and Chlorella into the MABR, and compared it with a control system inoculated with HN-AD bacteria and activated sludge. The effects of adding 0.8 μM exogenous C8-HSL on biofilm formation and the efficiency of nitrogen and phosphorus removal were investigated by comparing systems with and without the signaling molecule. Results showed that 0.8 μM C8-HSL enhanced the removal efficiencies of ammonia nitrogen, total nitrogen (TN), and total phosphorus (TP) by 25.17 %, 36.22 %, and 38.74 %, respectively, and increased extracellular polymeric substances (EPS) production by 68.62 %. High-throughput sequencing identified Desulfomicrobium and Aliidiomarina as the dominant microorganisms involved in nitrogen and phosphorus removal. The nirB gene played a key role in the denitrification process, and phoBR gene was essential for phosphorus removal. This study provides theoretical support for the application of quorum sensing in MABR systems, offering a novel strategy to improve the efficiency and stability of high ammonia wastewater treatment.
研究领域:
环境工程
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微生物学
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生物技术
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废水处理
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分子生物学
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产品关联
DOI
PubMed
高影响因子
ACS ES&T Water
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2024
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IF 4.8
Jianguo Li,Shikan Zheng,Wanli Yan,Chengsong Ye,Xin Yu
The membrane-aerated biofilm reactor (MABR) is emerging as a promising solution for future wastewater treatment owing to its remarkable proficiency in achieving concurrent nitrogen and carbon removal. The research addressed a new type of MABR (R2) equipped with a polytetrafluoroethylene membrane-wrapped hollow nylon rope module that was constructed to improve the carbon and nitrogen removal of conventional MABR (R1). Uninterrupted operation lasting 120 days was conducted to compare the performance of R1 and R2 in treating simulated municipal wastewater with varying chemical oxygen demand (COD)/nitrogen (C/N) ratios. The results showed that R2 outperformed R1, exhibiting over 15.9% and 27.9% higher COD and TIN removal rates, respectively. The nylon fillers promoted biofilm formation, mitigated membrane pore clogging by the extracellular polymeric substances, and maintained a stable transmembrane pressure. R2 consistently maintained stable ammonia removal efficiency across different C/N ratios, while R1 exhibited a notable decrease at a high influent C/N ratio. Utilizing nylon carriers on membranes offered a cost-efficient and convenient method for modifying and preparing membranes for treating wastewater with broader C/N ratios and scaling up MABR applications.
研究领域:
环境工程
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废水处理
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生物技术
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）