Insight into the roles of worm reactor on wastewater treatment and sludge reduction in anaerobic-anoxic-oxic membrane bioreactor (A2O-MBR): Performance and mechanism

Li-pin, LI; Tian, Yu; Zuo, Wei; Li, Hui; Li, Anran; Danping, Huang; Liu, Jia; YuHui, Liu; Sun, Zhimin; Liu, Yingshi

doi:10.1016/j.cej.2017.08.010

Cited by 36 publications

(13 citation statements)

References 40 publications

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“…Proteobacteria is regarded as one of the most widespread nitrification and denitrification phyla, and plays an important role in biological nitrogen and organic pollutant degradation . Bacteroidetes and Chloroflexi are considered responsible for metabolizing carbohydrates and decomposing complex or refractory organic compounds . The relative abundance of Bacteroidetes was similar in these three sludge samples (approximately 11%), while the relative abundance of Chloroflexi was different.…”

Section: Resultsmentioning

confidence: 90%

“…Chloroflexi also degrades carbohydrates such as SMPs and cellular materials, so its increase in the O‐MBR system may have alleviated MBR fouling . Nitrospirae and Ignavibacteriae are reported as nitrifying bacteria, so they were only detected in the anoxic and O‐MBR sludge samples, and their relative abundances were higher in the O‐MBR sludge sample than in the anoxic sludge sample. In addition, the relative abundance of Spirochaetae was much higher (2.73%), and it was only detected in the anaerobic sludge sample.…”

Section: Resultsmentioning

confidence: 99%

“…Microbial community analyses aid in the understanding of the mechanism of a biological process. Proteobacteria and Bacteroidetes have be identified as the dominant phyla in the activated sludge generated during both municipal wastewater treatment and industrial wastewater treatment . Proteobacteria is regarded as one of the most widespread nitrification and denitrification phyla, and plays an important role in biological nitrogen and phosphorous removal as well as organic pollutant degradation .…”

Section: Introductionmentioning

confidence: 99%

“…Bacteroidetes is another dominant and common phylum in the activated sludge of wastewater treatment plants (WWTPs), and is responsible for metabolizing carbohydrates and decomposing complex or refractory organic compounds . In addition, Nitrospirae , Chloroflexi , Actinobacteria and Firmicutes are the main phyla commonly detected in activated sludge . However, the class, order, family and genus level of the microbial community are significantly influenced by wastewater characteristics, treatment processes and their operational conditions.…”

Section: Introductionmentioning

confidence: 99%

“…However, the class, order, family and genus level of the microbial community are significantly influenced by wastewater characteristics, treatment processes and their operational conditions. Li et al used an AAO‐MBR 1 , a worm reactor (WR) intergated AAO‐MBR system (AAO‐MBR 2 ‐WR) and an AAO‐MBR‐WR auxiliary phosphorus removal reactor (AAO‐MBR 3 ‐WR‐PRR) to treat municipal wastewater, and found that the dominant functional bacteria shifted in these three systems based on genus level analysis. Thus, microbial community succession should be investigated to further elucidate the mechanism of pollutant removal and membrane fouling behavior in MBR‐integrated activated sludge systems.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced treatment of composite industrial wastewater using anaerobic‐anoxic‐oxic membrane bioreactor: performance, membrane fouling and microbial community

Wang

2019

J of Chemical Tech & Biotech

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BACKGROUND: A laboratory-scale anaerobic-anoxic-oxic membrane bioreactor (AAO-MBR) system was used to remove organic compounds and nitrogen in the composite industrial wastewater collected from an industrial park. RESULTS:The recommended conditions for both chemical oxygen demand (COD) and nitrogen removal were as follows: hydraulic retention time of 73.6 h, sludge retention time of 35 days and mixed liquor return ratio of 300%. Under this condition, COD and total nitrogen removal efficiencies were 89.4% and 77.7%, respectively. After treatment, most organic compounds were removed, but there were still a few refractory organic compounds in the final effluent, such as 2-hydroxydesmethylimipramine, 1-dichloromethyl-3-methyl-benzene and N-phenyl-2,3-dichloromaleimide. Compared to carbohydrates, proteins in the extracellular polymetric substances accumulated more easily on the membrane surface, resulting in the membrane fouling. Ternary analysis at the family level indicated that the bacteria Desulfuromonadaceae, Rikenellaceae, and Spirochaetaceae were dominant in the anaerobic sludge, and played an important role in hydrolysis and fermentation. The abundance distributions of Nitromonadaceae, Caldilineaceae and Xanthomonadales were above 50% in the anoxic sludge, and these bacteria played an important role in denitrification. CONCLUSION:The results can provide valuable information for optimizing the operation of the AAO-MBR system for the treatment of composite industrial wastewater. Industry the anaerobic, anoxic and oxic membrane bioreactor (O-MBR) tanks were taken from the anaerobic, anoxic and oxic tanks in the CWWTP, respectively. Experimental setup and operational conditionsThe setup and operation of the laboratory-scale AAO-MBR system was similar to the CWWTP, and its schematic diagram is also shown in Fig. S1. The working volumes of the anaerobic, anoxic and O-MBR systems were 13.3, 13.0 and 16.0 L, respectively. A sedimentation reactor with a working volume of 20.0 L was set between the anaerobic reactor and the anoxic reactorNitrogen removal NH 4 + -N removal by the AAO-MBR system during the entire operation period is shown in Fig. 1(b). The NH 4 + -N concentration in

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced treatment of composite industrial wastewater using anaerobic‐anoxic‐oxic membrane bioreactor: performance, membrane fouling and microbial community

Wang

2019

J of Chemical Tech & Biotech

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Simultaneous phosphorus and nitrogen removal with different C/N ratios in a low oxygen aeration system: Microorganisms and mechanisms

Jin

Liu

Jia

et al. 2022

Water Environment Research

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In this study, a combined system with simultaneous nitrification, denitrification, and phosphorus removal was operated in continuous low oxygen aeration mode, and the effect of lower oxygen aeration (dissolved oxygen [DO] 0.5–1.5 mg/L) on its performance was examined. The combined system consisted of sludge and high‐efficiency biological packing and was operated using four carbon/nitrogen ratios (C/N) with being 10:1, 8:1, 6:1, 10:1. Experimental results showed that the combined system could perform an efficient nitrogen and phosphorus removal under low DO and C/N ratio of 8:1 condition, and removal efficiencies of chemical oxygen demand (COD), NH4+‐N, and PO43−‐P were 80.01%, 99.03%, and 89.51%, respectively. High‐throughput analysis indicated that the functional species of denitrifying bacteria, including Ferruginibacter Azospira, Comamonas, Bacilli, Hyphomicrobium, Thauera, and Comamonadaceae, were important participants in biological nutrient removal. Meanwhile, Acinetobacter was enriched in the combined system, which contributed to phosphorus removal. Practitioner Points A combined system was operated firstly under continuous low oxygen condition. The lower dissolved oxygen (DO) of the combined system was maintained at 0.50–1.5 mg/L level. The combined system could realize simultaneous phosphorus and nitrogen removal under C/N ratio of 8:1. Several functional bacteria were enriched in the coupled systems.

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Effect of pH on Pollutants Removal of Ship Sewage Treatment in an Innovative Aerobic-Anaerobic Micro-Sludge MBR System

Cai

Ben

Zaidi

et al. 2019

Water Air Soil Pollut

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Insight into the roles of worm reactor on wastewater treatment and sludge reduction in anaerobic-anoxic-oxic membrane bioreactor (A2O-MBR): Performance and mechanism

Cited by 36 publications

References 40 publications

Enhanced treatment of composite industrial wastewater using anaerobic‐anoxic‐oxic membrane bioreactor: performance, membrane fouling and microbial community

Enhanced treatment of composite industrial wastewater using anaerobic‐anoxic‐oxic membrane bioreactor: performance, membrane fouling and microbial community

Simultaneous phosphorus and nitrogen removal with different C/N ratios in a low oxygen aeration system: Microorganisms and mechanisms

Effect of pH on Pollutants Removal of Ship Sewage Treatment in an Innovative Aerobic-Anaerobic Micro-Sludge MBR System

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