Role of EPS in membrane fouling of a submerged anaerobic-anoxic-oxic (A-A-O) membrane bioreactor for municipal wastewater treatment

Wang, Zhiwei; Wu, Zhichao; Tang, Shujuan; Ye, Shaofan

doi:10.5004/dwt.2011.2788

Cited by 17 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The release of these compounds at these special intervals of time can be a result of bacterial metabolism or cell lysis which both of them report to the presence of an environmental stress or toxicity inside the bioreactor. However, the membrane fouling can be influenced by the presence of these substances which form a gel layer into the membrane surface ideal for further bacterial attachment, increasing the effect of membrane clogging potential [48,49]. In this study, it was noticed that the amount of polysaccharides and proteins released during the evoked periods were quite high with, respectively, 10 ± 0.1-20 ± 0.5 mg g MLVSS for proteins.…”

Section: Evolution Of Membrane Fouling and Smp Releasementioning

confidence: 86%

Biodegradation of olive mill wastewater in a membrane bioreactor: acclimation of the biomass and constraints

Jaouad

Villain

Ouazzani

et al. 2015

Desalination and Water Treatment

View full text Add to dashboard Cite

International audienceIn order to overcome the toxic effect of olive mill wastewater (OMWW) on biomass during biological treatment, this work will test OMWW biodegradation in a membrane bioreactor (MBR) using an acclimation procedure and will study its constraints. Special focus will be put on soluble microbial products (SMP) analysis in MBR and their impact on membrane fouling. The study was realized in an external ceramic ultrafiltration MBR which offers more flexibility than the other biological treatments (i.e. independence between both hydraulic and sludge retention time) and a smaller footprint. Fed with a mass ratio of 40% OMWW/60% glucose, MBR biomass showed efficient chemical oxygen demand and polyphenols removal rates of, respectively, 90 and 65% despite a low activity of 3.2 mgO2 gMLVSS−1 h−1 due to the harsh and toxic environment. Moreover, HPLC analysis has showed a removal from the permeate of the major phenolic compounds including hydroxytyrosol, tyrosol, and caffeic acid. The monitoring of SMP concentrations has contributed to identify the presence of an environmental stress during OMWW input. Polysaccharide and protein are the main SMP fractions released with, respectively, 10 ± 0.1–20 ± 0.5 mg gMLVSS−1 and 4 ± 0.01–8 ± 0.01 mg gMLVSS−1. These SMP and higher molecular weight compounds brought by OMWW were found to be partially responsible for the intensive membrane fouling obtained. The feasibility of biomass acclimation directly to OMWW composed of multi-phenolic compounds was proved in MBR and its constraints were discussed. Microfiltration membrane would be suggested to overcome the constraints observed when ultrafiltration membrane was used (150 kDa)

show abstract

Section: Evolution Of Membrane Fouling and Smp Releasementioning

confidence: 86%

Biodegradation of olive mill wastewater in a membrane bioreactor: acclimation of the biomass and constraints

Jaouad

Villain

Ouazzani

et al. 2015

Desalination and Water Treatment

View full text Add to dashboard Cite

show abstract

“…[1][2][3]. However, membrane fouling leads to performance reduction, rapid pressure increase, or severe flux decline and frequent membrane cleaning, which directly result in the increase of maintaining and operating costs.…”

Section: Introductionmentioning

confidence: 98%

Impact of calcium-to-magnesium ratio on the performance of submerged membrane bioreactors

Wang

Chen

Qian

et al. 2012

Desalination and Water Treatment

View full text Add to dashboard Cite

A B S T R A C TThe performances of membrane bioreactors (MBRs) were compared in bench-scale submerged MBRs treating synthetic wastewater at three Ca:Mg ratios of 3:1, 1:1, and 1:3 with constant divalent cations of 200 mg/L. The dosages of Ca 2+ were 150, 100, and 50 mg/L, corresponding to Mg 2+ of 50, 100, and 150 mg/L for Ca:Mg ratios of 3:1, 1:1, and 1:3, respectively. The results showed that Ca:Mg ratio had a slight impact on effluent quality, while membrane fouling was effectively mitigated by enlarging Ca:Mg ratio due to the decline of fouling layer resistance. When Ca:Mg ratio declined from 3:1 to 1:3, the concentration of soluble microbial products (SMP) significantly increased, while the particle size of flocs decreased. SMP and particle size correlated well with the variation of membrane fouling. The carbohydrate in SMP and bound extracellular polymeric substances (BEPS) changed significantly with the decline of Ca:Mg ratio, while the protein in SMP and BEPS varied slightly, suggesting that the divalent cations were more prone to bridging carbohydrate compared with protein. In comparison with Mg 2+ , Ca 2+ had a more significant impact on mitigating membrane fouling, because Ca 2+ was more beneficial to binding and bridging negatively charged functional groups in extracellular polymeric substances such as carbohydrate.

show abstract

“…Many researchers focused on the relationship between EPS and membrane fouling in MBR, and diffident conclusions came out mainly attributed to the variations of feedwater characteristics and operating conditions. Some researchers (Cho et al 2005;Liu et al 2012;Wang et al 2009;Wang et al 2011) found that bEPS especially the loosely bound EPS (lbEPS) played a more significant role in membrane fouling, while others (Meng et al 2009) considered that the soluble EPS (or SMP) had greater impact on membrane fouling than bEPS. There are also some debates between proteins and polysaccharides in EPS for which one have more contribution on membrane fouling (Sweity et al 2011;Wang et al 2011).…”

Section: Eps Analysismentioning

confidence: 99%

Effects of returning NF concentrate on the MBR-NF process treating antibiotic production wastewater

Cheng

Jianxing

et al. 2016

Environ Sci Pollut Res

View full text Add to dashboard Cite

The optimization of the nanofiltration (NF) concentrate backflow ratio (R cb ) and the influence of the NF concentrate on the performance of membrane bioreactornanofiltration (MBR-NF) process treating antibiotic production wastewater were investigated on a laboratory scale. The R cb was optimized at 60 % based on the removal rates of chemical oxygen demand (COD) and NH 4 + -N by MBR. Data analyses indicated that salinity brought by NF concentrate is the major driver leading to the decrease of sludge activity, especially at a high R cb . EPS analysis showed that electric conductivity (EC), proteins in soluble microbial products (SMP), and SMP brought by NF concentrate are the dominant factors causing the severe membrane fouling in MBR. Furthermore, undegradable substances including fulvic acid-like and humic acid-like compounds accumulated in NF concentrate showed significant influence on fouling of NF. MBR could well degrade small MW compounds in NF concentrate, which confirmed the enhancement of organic removal efficiency by recycling the NF concentrate to MBR. The MBR-NF process showed a relatively stable performance at the R cb of 60 % (volume reduction factor (VRF) = 5), and the NF permeate could satisfy the water quality standard for fermentation process with a water recovery rate of 90.9 %.

show abstract

Role of EPS in membrane fouling of a submerged anaerobic-anoxic-oxic (A-A-O) membrane bioreactor for municipal wastewater treatment

Cited by 17 publications

References 16 publications

Biodegradation of olive mill wastewater in a membrane bioreactor: acclimation of the biomass and constraints

Biodegradation of olive mill wastewater in a membrane bioreactor: acclimation of the biomass and constraints

Impact of calcium-to-magnesium ratio on the performance of submerged membrane bioreactors

Effects of returning NF concentrate on the MBR-NF process treating antibiotic production wastewater

Contact Info

Product

Resources

About