Characterizing membrane foulants in MBR with addition of polyferric chloride to enhance phosphorus removal

Yang, Xiao-Li; Song, Hai-Liang; Chen, Ming; Cheng, Bing

doi:10.1016/j.biortech.2011.07.105

Cited by 34 publications

(17 citation statements)

References 33 publications

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“…Fe and Al are commonly identified by SEM-EDX in cake layers of MBRs treating municipal wastewater (Meng et al, 2007, Yang et al, 2011. In this study, virtually all of the Fe and Al in the influent were retained in the A/O-MBR.…”

Section: Inorganic Components and Their Structure In The Cake Layermentioning

confidence: 57%

“…Si might be dominant in cake layers without characterizing the Si form (Guo et al, 2012, Meng et al, 2007, Yang et al, 2011. A comparison of Si in the cake layer and sludge indicates that the majority of the Si is retained in the cake layer with the dominant fraction residing in the residual insoluble fraction (F4).…”

Section: Inorganic Components and Their Structure In The Cake Layermentioning

confidence: 99%

“…Several papers demonstrated that the inorganic components within membrane cake layers are composed of elements such as Mg, Al, Fe, Ca, Si, etc. (Chen et al, 2012, Gao et al, 2011, Meng et al, 2011, Yang et al, 2011. However, these studies utilized spot-scan energy-dispersive X-ray analyzers (EDX) for cake component analysis, which is only capable of measuring the elemental distribution within a very small spot of the cake layer surface.…”

Section: Introductionmentioning

confidence: 99%

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Structure and distribution of inorganic components in the cake layer of a membrane bioreactor treating municipal wastewater

Zhou

Xia

Alvarez‐Cohen

2015

Bioresource Technology

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TitleStructure and distribution of inorganic components in the cake layer of a membrane bioreactor treating municipal wastewater. Permalink https://escholarship.org/uc/item/4hw0p6mh Journal Highlights• Characterize the structure and distribution of the inorganic in cake layer of MBR.• BCR, XPS and map/line scanning EDX identify the inorganic structure in cake layer.• Si, Al, Ca, Mg, Fe, and Ba are the predominant inorganic compounds in cake layer.• The predominant inorganic compounds are found to occur mostly as crystal particles.• Si and Al accumulate together along the cross-sectional cake layer as SiO2-Al2O3. AbstractA laboratory-scale submerged anoxic-oxic membrane bioreactor treating municipal wastewater was operated to investigate the structure and distribution of the inorganic cake layer buildup on the membrane. BCR (European Community Bureau of Reference) sequential extraction, X-ray photoelectron spectroscopy (XPS), and both map and line scan of energy-dispersive X-ray analysis (EDX) were performed for cake layer characterization. BCR results showed that Si, Al, Ca, Mg, Fe, and Ba were the predominant inorganic elements in the cake layer, and they occurred mostly as crystal particles. Crystal SiO2 was the dominant inorganic compound while Ca in the form of CaSO4 (dominant) and CaCO3 were also present, but exerted little effect on the cake layer structure because most of these compounds were deposited as precipitates on the reactor bottom. EDX results indicated that Si and Al accumulated together along the cross-sectional cake layer in the form of Si-Al (SiO2-Al2O3) crystal particles. Graphical abstractDownload high-res image (76KB) Download full-size image

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Section: Inorganic Components and Their Structure In The Cake Layermentioning

confidence: 57%

Section: Inorganic Components and Their Structure In The Cake Layermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure and distribution of inorganic components in the cake layer of a membrane bioreactor treating municipal wastewater

Zhou

Xia

Alvarez‐Cohen

2015

Bioresource Technology

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“…Wu and Huang and Yang et al investigated the influence of coagulants such as polymeric ferric sulfate (PFS) and polymeric ferric chloride (PFC) on membrane performance. It was demonstrated that PFS can be effective for the reduction of membrane fouling by increasing the sludge floc size by enhancing the charge neutralization of organic particles.…”

Section: Fouling Control Strategiesmentioning

confidence: 99%

Current Status and Future Prospects of Membrane Bioreactors (MBRs) and Fouling Phenomena: A Systematic Review

et al. 2018

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Membrane bioreactors (MBRs) have been widely used for municipal and industrial wastewater treatment around the world due to their advantages, which include higher efficiency, smaller footprint, and lower sludge production over other conventional activated sludge (CAS) processes. However, membrane fouling that results from physicochemical interactions between the membrane and the components of the mixed liquor still remains the most challenging matter preventing the broad application of MBR technology. Recently, a considerable number of experimental and modelling investigations have been conducted concerning MBRs and membrane fouling. Despite the development of low‐fouling membrane systems, more research and engineering activities with a focus on surface modification, wastewater specifications, pre‐treatment and treatment conditions, and efficient fouling control and remedy strategies are still needed to minimize the probability of the occurrence of fouling. It is vital to investigate important aspects of the characterization and mechanisms of the fouling phenomenon to find reliable and long‐term solutions. This review provides a detailed survey of the main aspects of the MBR processes, configurations, advantages and disadvantages, fouling phenomenon, and fouling control strategies in MBRs. Past research and engineering activities in this area are critically reviewed such that pros and cons of recent developments in fouling inhibition and mitigation approaches are also discussed. The main practical and theoretical challenges for the effective utilization of MBRs in various municipal and industrial sectors are then addressed. At the end, we offer useful practical guidelines and recommendations for the better design and operation of MBRs in industrial and public communities.

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“…As a major component of membrane biofouling, biofilms, which are formed of a complex mixture of microbial cell clusters, polysaccharides and proteins, have been intensively investigated (Meng et al 2007;Yang et al 2011;Hwang et al 2012). However, no consensus has been reached on their role in the biofouling process.…”

Section: Introductionmentioning

confidence: 99%

The correlation between biofilm biopolymer composition and membrane fouling in submerged membrane bioreactors

et al. 2014

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Biofouling, the combined effect of microorganism and biopolymer accumulation, significantly reduces the process efficiency of membrane bioreactors (MBRs). Here, four biofilm components, alpha-polysaccharides, beta-polysaccharides, proteins and microorganisms, were quantified in MBRs. The biomass of each component was positively correlated with the transmembrane pressure increase in MBRs. Proteins were the most abundant biopolymer in biofilms and showed the fastest rate of increase. The spatial distribution and co-localization analysis of the biofouling components indicated at least 60% of the extracellular polysaccharide (EPS) components were associated with the microbial cells when the transmembrane pressure (TMP) entered the jump phase, suggesting that the EPS components were either secreted by the biofilm cells or that the deposition of these components facilitated biofilm formation. It is suggested that biofilm formation and the accumulation of EPS are intrinsically coupled, resulting in biofouling and loss of system performance. Therefore, strategies that control biofilm formation on membranes may result in a significant improvement of MBR performance.

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Characterizing membrane foulants in MBR with addition of polyferric chloride to enhance phosphorus removal

Cited by 34 publications

References 33 publications

Structure and distribution of inorganic components in the cake layer of a membrane bioreactor treating municipal wastewater

Structure and distribution of inorganic components in the cake layer of a membrane bioreactor treating municipal wastewater

Current Status and Future Prospects of Membrane Bioreactors (MBRs) and Fouling Phenomena: A Systematic Review

The correlation between biofilm biopolymer composition and membrane fouling in submerged membrane bioreactors

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