A novel configuration for an anaerobic submerged membrane bioreactor (AnSMBR). Long-term treatment of municipal wastewater under psychrophilic conditions

Through a long-term experiment, the performance of membrane bioreactor(MBR) for contaminants removal and membrane fouling was investigated. The results demonstrated that the removal effect of COD and NH3-N by the MBR was better. The effluent COD and NH3-N were lower than 50mg/L and 4mg/L, respectively. The observation by using the scanning electronic microscope(SEM) presented at the beginning of membrane filtration, there was no fouling in the membrane pores. With the continuous operation of the MBR, foulants shaped like mud cakes appeared in the membrane poles. The increasing of MLSS(mixed liquor suspended solids) concentration in the bioreactor didn’t increase membrane fouling. During the 75 days of operation, MBR cleaning was carried out twice.

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Sustainable membrane operation design for the treatment of the synthetic coke wastewater in SMBR

Water Science & Technology ◽

10.2166/wst.2009.540 ◽

2009 ◽

Vol 60 (8) ◽

pp. 2115-2124 ◽

Cited By ~ 2

Author(s):

Ying Zhou ◽

Zhen-liang Xu ◽

Shahda Munib ◽

Gui-e Chen ◽

Qiong Lu

Keyword(s):

Membrane Fouling ◽

Membrane Bioreactor ◽

Operating Time ◽

Term Treatment ◽

Membrane Properties ◽

Critical Flux ◽

Coke Wastewater ◽

Sustainable Operation ◽

Long Term Treatment

Membrane fouling in the membrane bioreactor (MBR) is typically caused by the interaction of microbial characteristics, hydrodynamic behavior, operation environment, wastewater characteristics and membrane properties, which result in the deterioration of performance and increasing energy consumption and cost of membrane replacement. The effect of the crucial MBR parameters (the microbial loading and characteristics, dissolved oxygen (DO), hydraulic retention time (HRT), backwashing conditions and membrane characteristics) on membrane fouling was investigated in a submerged membrane bioreactor (SMBR) during the long term treatment of synthetic coke wastewater. Also the optimum operation strategies were further utilized in order to satisfy the minimal membrane fouling operation through a long-term evaluation of the MBR performance. It has been demonstrated that with application of these optimal designed conditions, significant membrane fouling improvements were achieved over a long operating time, so it was possible to perform in sustainable operation for MBR. In this study, the upper limit of the sustainable flux is found to be as much as 18.6 L/m2 h and the optimum sustainable flux value should be 50 ∼ 75% of critical flux to satisfy the desired sustainable operation period.

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Long-term treatment of municipal wastewater using a mesh rotating biological reactor and changes in the biofilm community

Environmental Technology & Innovation ◽

10.1016/j.eti.2021.102074 ◽

2021 ◽

pp. 102074

Author(s):

Shunji Fuchigami ◽

Masashi Hatamoto ◽

Ryota Takagi ◽

Takumi Akashi ◽

Takahiro Watari ◽

...

Keyword(s):

Municipal Wastewater ◽

Term Treatment ◽

Long Term Treatment ◽

Biofilm Community

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Pilot study on municipal wastewater treatment by a modified submerged membrane bioreactor

Water Science & Technology ◽

10.2166/wst.2006.271 ◽

2006 ◽

Vol 53 (9) ◽

pp. 103-110 ◽

Cited By ~ 10

Author(s):

Chunhai Wei ◽

Xia Huang ◽

Xianghua Wen

Keyword(s):

Flow Rate ◽

Membrane Bioreactor ◽

Municipal Wastewater ◽

Air Flow ◽

Air Flow Rate ◽

Critical Flux ◽

Submerged Membrane Bioreactor ◽

Aeration Intensity ◽

N Removal

A pilot-scale modified submerged membrane bioreactor (SMBR) with the capacity of 18.1 m3d−1 was developed on the basis of the principle of air-lift internal-loop reactor. Economical aeration intensity of the SMBR was determined as 96 m3m−2h−1 according to hydrodynamic investigation. Corresponding economical air-flow rate was selected as the working air-flow rate in the long-term run. Under economical aeration intensity, the critical flux zone of the modified SMBR was as high as 30–35 Lm−2h−1 when MLSS was less than 13 gL−1. Therefore, a sub-critical flux of 30 Lm−2h−1 was selected as the working membrane flux in the long-term run. Membrane fouling was effectively controlled by sub-critical flux operation and periodic on-line chemical cleaning in the long-term run. When the average influent CODCr, NH3-N and turbidity were 310 and 44.3 mgL−1 and 161 NTU, respectively, the average permeate were 38.5 and 19.5 mgL−1 and 0.96 NTU under hydraulic retention time (HRT) was only 2.8 h. Corresponding removal was 86, 58.2 and 99.4%. DO deficiency caused by high MLSS was demonstrated as the main reason for low NH3-N removal.

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