Enzyme augmentation of an anaerobic membrane bioreactor treating sewage containing organic particulates
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Keywords:
Volatile suspended solids
Enzymatic Hydrolysis
Membrane bioreactor
Extracellular polymeric substance
This study reported a novel strategy of integrating MFCs with a membrane bioreactor(MBR) for membrane fouling mitigation.The soluble microbial products(SMP) and extracellular polymeric substances(EPS) from the suspended sludge of MFC-MBR combined system and conventional MBR were analysed.Compared to the conventional MBR,the SMP and TB-EPS concentrations in the MFC-MBR combined system increased by 8.5% and 9.2% respectively.Conversely,the LB-EPS concentration decreased by 47.5%.In addition,the aromatic protein and humic acid in LB-EPS also decreased significantly.The membrane fouling was also investigated in the conventional MBR and MFC-MBR combined system.The time required to reach a TMP of 30 kPa was 38 days in the conventional MBR and 55 days in the MFC-MBR combined system,which indicated that the recycling of the sludge treated by MFC was able to alleviate membrane fouling.
Membrane bioreactor
Extracellular polymeric substance
Membrane Fouling
Volatile suspended solids
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Extracellular polymeric substance
Membrane bioreactor
Volatile suspended solids
Hydraulic retention time
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Submerged membrane bioreactor(SMBR) was used to treat domestic wastewater.The influences of operation conditions(sludge burthen,aeration,pH value,etc) on the extracellular polymeric substances(EPS) and sludge properties in the reactor were investigated respectively,and the relation between EPS and sludge properties were discussed.The experiment results showed that EPS and amylase will decrease as burthen Ns or aeration increases,and amylose and protein sludge will increase as pH value increases.There was positive correlation between Zeta potential and EPS,with correlation coefficient R20.97;pH was a better operation parameter than EPS to indicate the sludge properties.
Membrane bioreactor
Extracellular polymeric substance
Zeta potential
Volatile suspended solids
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Amongst sludge reduction strategies, the anaerobic side-stream sludge holding tank (SHT) is of particular interest because it has shown significant sludge reduction efficiency. However, due to the anaerobic and starving environment of the SHT, the release of extracellular polymeric substance (EPS) may be stimulated, and it may hamper the application of the SHT to the membrane bioreactor. In order to investigate the effect of sludge storage on EPS release, sludge samples from a pilot-scale sequencing batch reactor coupled with SHT was incubated in a series of bench-scale SHT reactors for different periods of time (0–24 h). The increase in EPS was not significant until 12 h of incubation (9.3%), while 40.9% of the increase was observed in the sample incubated for 24 h. The rapid increase in EPS concentration after 12 h indicates a greater rate of cell lysis than that with EPS consumption as substrate. Since inducing the initial stage of the endogenous phase within microorganisms is a key factor for the successful operation of the SHT for sludge reduction, the retention time for the SHT should be shorter than the time for the sudden increase in EPS release.
Extracellular polymeric substance
Membrane bioreactor
Membrane Fouling
Volatile suspended solids
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Methanosaeta
Hydraulic retention time
Mesophile
Membrane Fouling
Membrane bioreactor
Filtration (mathematics)
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Volatile suspended solids
Enzymatic Hydrolysis
Membrane bioreactor
Extracellular polymeric substance
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A pilot-scale membrane bioreactor was operated for advanced treatment of secondary effluent from a wastewater treatment plant. The performance and biomass characteristics were evaluated under two different hydraulic retention time (HRT) values (7.5 and 15 hours). The system was operated successfully without biomass purge and, after an initial phase, evolved until reaching a constant mixed-liquor volatile suspended solids (MLVSS) concentration, which resulted in the same value of carbon utilization rate (0.067 +/- 0.004 kg COD kg(-1) MLVSS d(-1)) for both HRTs. Respiration tests (maximum and endogenous oxygen uptake rates) confirmed a low microbial activity, which approached constant values (0.32 +/- 0.001 and 0.064 +/- 0.007 g O2 g(-1) MLVSS d(-1), respectively), regardless of the HRT. The sludge morphology and bound and supernatant extracellular polymeric substances also were assessed. Membrane performance was characterized by a stable behavior occurring simultaneously with a high level of biodegradation in the microcolloidal and soluble fraction.
Volatile suspended solids
Membrane bioreactor
Hydraulic retention time
Extracellular polymeric substance
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Extracellular polymeric substance
Membrane bioreactor
Hydraulic retention time
Volatile suspended solids
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The relationships of the diversification of extracellular polymeric substances(EPS) with aeration intensity,organic loading and sludge retention time(SRT) in membrane bioreactor(MBR) were studied.Experimental results showed that the concentration of EPS decreased with the increase of air to water ratio from 20 to 40.When air to water ratio was over 35,the concentration of EPS remained relatively constant.As organic loading was reduced from 0.129 kg COD/kg VSS·d to 0.016 kg COD/kg VSS·d,the concentration of bound EPS decreased,and soluble EPS presented an adverse trend.When sludge retention time increased from 40 d to 180 d,the concentration of bound EPS decreased slightly and then increased rapidly,soluble EPS presented a same trend to sludge retention time.
Extracellular polymeric substance
Membrane bioreactor
Retention time
Volatile suspended solids
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The relationships of the diversification of extracellular polymeric substances(EPS) with sludge retention time(SRT) under continuous sludge discharge pattern and incontinuous sludge discharge pattern in membrane bioreactor(MBR) were studied.Experimental results showed that compared to continuous sludge discharge pattern,concentrations of EPS were higher under incontinuous sludge discharge pattern.As sludge retention time increased,the concentration of bound EPS decreased slightly and then increased rapidly,soluble EPS presented a same trend to sludge retention time.
Extracellular polymeric substance
Membrane bioreactor
Volatile suspended solids
Retention time
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