Influence of temperature and temperature shock on sludge properties, cake layer structure, and membrane fouling in a submerged anaerobic membrane bioreactor

Gao, Weiqi; Qu, Xiaolu; Leung, Ka Yin; Liao, Baoqiang

doi:10.1016/j.memsci.2012.07.003

Cited by 64 publications

(20 citation statements)

References 43 publications

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“…play an important role in membrane fouling under both aerobic and anaerobic conditions [49][50][51][52]. Thus, we can assume that deposition of biopolymers from the mixed liquor contributed to the higher cake layer resistance under low DO conditions.…”

Section: Fouling Mechanismsmentioning

confidence: 98%

A low energy gravity-driven membrane bioreactor system for grey water treatment: Permeability and removal performance of organics

Ding

Liang

et al. 2017

Journal of Membrane Science

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Synthetic grey water was treated with a low-pressure gravity-driven membrane bioreactor (GDMBR) system. The system was operated without any direct shear at the membrane surface and without any cleaning or flushing. In order to reduce energy consumption, one reactor was operated without aeration and the results were compared with an aerated reactor. Although the dissolved oxygen content was low (0.4-0.6 mg/L) in the nonaerated system, a stable permeability was observed at a level of around 20 L/m 2 hbar (flux of 1 L/m 2 h). The fouling resistance was dominated by the bio-fouling layer, which could be removed hydraulically. In comparison to the aerated system, the bio-fouling layer grown

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Section: Fouling Mechanismsmentioning

confidence: 98%

A low energy gravity-driven membrane bioreactor system for grey water treatment: Permeability and removal performance of organics

Ding

Liang

et al. 2017

Journal of Membrane Science

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“…Earlier research reported that extracellular polymeric substances (EPS) may have significant effects on floc structure and sludge settleability; this phenomenon could enhance sludge solid surface adsorption in the SsLR system and membrane surface . Also, it could enhance membrane filtration as EPS adhere to the membrane surface .…”

Section: Discussionmentioning

confidence: 99%

Effect of temperature on treating chemical synthesis‐based pharmaceutical wastewater containing 7‐ACA by a novel multi‐stage loop membrane bioreactor

Chen

et al. 2014

J of Chemical Tech & Biotech

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BACKGROUND: 7-amino cephalosporanic acid (7-ACA) is the most critical intermediate for cephalosporin antibiotics but has caused serious water pollution. In this study, a bench-scale test was conducted with a novel multi-stage loop membrane bioreactor (MsLMBR) to treat chemical synthesis-based pharmaceutical wastewater containing 7-ACA. RESULTS: The MsLMBR system comprised a multi-stage loop aerobic reactor and a separate membrane module operated at different temperatures. Results showed that for MsLMBR1 at 15 ∘ C, MsLMBR2 at 25 ∘ C and MsLMBR3 at 35 ∘ C, the average total chemical oxygen demands (TCODs) of the effluent were all less than 80 mg L −1 . For MsLMBR2 and MsLMBR3, the microorganisms had better microbial activities and drug-resistances, and the biological removal was given priority to TCOD removal. But for MsLMBR1, there was no significant difference between biological removal and physical removal at the early stage. Average 7-ACA concentration of effluent was less than 40 mg L −1 at 35 ∘ C. The laboratory data fitted the simulated data well using a time series analysis model (TSAM) in a MsLMBR system. CONCLUSION: 7-ACA pharmaceutical wastewater was effectively treated in a MsLMBR system, which also performed well at low temperature. In addition, the TSAM was a valid means to simulate and predict the efficiency of removal of an organic substance. Industry pore size is 0.22 um and molecular weight cut-off (MWCO) is 15000 D. The maximum operating temperature of this separate membrane module is 60 ∘ C, maximum operating pressure is 800 kPa, the range of pH is 2-10, designed membrane flux (critical flux )

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“…Due to the interception of the membrane, there is no need for the secondary sedimentation tank to separate solid and liquid, all the biomass can stay in the reactor and reach a high concentration, which makes the process has the advantages of a small footprint, high quality of effluent, complete solid-liquid separation and so on [1] . In the process of operation, membrane components are prone to be polluted, resulting in a decrease in membrane flux and membrane performance, resulting in an increase in operating costs, which hinders its widespread application in practice [2] .Study showed that the concentration of biomass is one of the important influence parameter on running the sMBR reactor [3] , it not only affects the removal efficiency of pollutants, but also affects the viscosity [4] , extracellular polymer (EPS) content [5] and other characteristics of sludge in sMBR. Therefore, high biomass concentration is a necessary guarantee for sMBR to achieve efficient sewage purification, but it is also a key factor to increase membrane component pollution and hinder rapid mass transfer (such as oxygen supply, nutrient transfer, and metabolite transfer), thus affecting the overall operation efficiency of the system.…”

Section: Introductionmentioning

confidence: 99%

Proliferation of biomass and its impact on the operation of a submerged membrane bioreactor

et al. 2020

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The aim of this work was to investigate the biomass proliferation and its impact on the operation of a submerged membrane bioreactor (sMBR). A programmable logic controller (PLC) was used to control the process of the sMBR with no discharge of sludge. When MLSS was 9670 mg/L and the solid retention times (SRT) ranged from 20 to 40 days, the optimal removal efficiencies of COD, NH3-N, TP were 93.89%, 93.02%, 80.57%, respectively. Accompanying with the decreasing of the sludge loading, the substrate and nutrition were insufficient in the sMBR, leading to endogenous respiration of the activated sludge, which decreased the activity of sludge and resulted in the death of more microorganisms.

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Influence of temperature and temperature shock on sludge properties, cake layer structure, and membrane fouling in a submerged anaerobic membrane bioreactor

Cited by 64 publications

References 43 publications

A low energy gravity-driven membrane bioreactor system for grey water treatment: Permeability and removal performance of organics

A low energy gravity-driven membrane bioreactor system for grey water treatment: Permeability and removal performance of organics

Effect of temperature on treating chemical synthesis‐based pharmaceutical wastewater containing 7‐ACA by a novel multi‐stage loop membrane bioreactor

Proliferation of biomass and its impact on the operation of a submerged membrane bioreactor

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