Degradation of extracellular polymeric substances (EPS) extracted from activated sludge by low-concentration ozonation

Li, Meng; Xi, Jinying; Yeung, Marvin

doi:10.1016/j.chemosphere.2015.12.060

Cited by 82 publications

(19 citation statements)

References 38 publications

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“…It was reported that EPS are a main part of biofilms and make up about 50-80 % (w/w) of the total biofilms' weight. [73,79] Therefore, EPS facilitate the formation of the cake layer through a co-deposition of EPS and microorganisms in the membrane and filling void spaces between the cells leading to a decrease in membrane permeability. Since the shear modulus of elasticity and shear viscosity are the major factors affecting the biofilm and EPS cohesion, EPS play a critical role in the biofouling of MBR systems.…”

Section: Biomass Characteristicsmentioning

confidence: 99%

“…EPS have a considerable influence on the sludge flocs’ cohesion and the biofilms’ viscoelastic properties. It was reported that EPS are a main part of biofilms and make up about 50–80 % (w/w) of the total biofilms’ weight . Therefore, EPS facilitate the formation of the cake layer through a co‐deposition of EPS and microorganisms in the membrane and filling void spaces between the cells leading to a decrease in membrane permeability.…”

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confidence: 99%

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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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Section: Biomass Characteristicsmentioning

confidence: 99%

mentioning

confidence: 99%

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

et al. 2018

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“…S4). During ozonation of water samples containing bacteria, the extracellular and endogenous proteins could be detached and leaked into water as dissolved components (Meng et al, 2016), which might affect the monitoring of the protein-like fluorescence. Compared to the protein-like fluorescence, the humic-like fluorescence is more sensitively detected by online sensors using silicon photodiode (Li et al, 2016b).…”

Section: Application Of Uva/fluorescence Indices As Indicators For MImentioning

confidence: 99%

Applying UV absorbance and fluorescence indices to estimate inactivation of bacteria and formation of bromate during ozonation of water and wastewater effluent

Cheng

Cai

et al. 2018

Water Research

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Ozone is an effective oxidant and disinfectant commonly used for elimination of micropollutants and inactivation of resistant microbes. However, undesirable oxidation/disinfection byproducts such as bromate might form during ozonation. In this study, the UV absorbance and fluorescence indices were applied as surrogate indicators for predicting the inactivation of bacteria and formation of bromate during ozonation of water and wastewater effluents. The inactivation efficiencies of lab-cultured Escherichia coli (E. coli) and autochthonous bacteria were measured by plating (for E. coli only) and flow cytometry with fluorescence staining. During ozonation of E. coli spiked into wastewater effluents (∼10 cell/mL), the priority of inactivation efficiency determined by different cell viability methods were in the order of CFU > membrane damage > DNA damage. Approximately, 99% membrane damage and/or 90% DNA damage are conservatively supposed as an indicator for sufficient bacterial inactivation as well as degradation of antibiotic resistance genes. The related required O dosing thresholds for sufficient inactivation of E. coli and autochthonous bacteria refer to ∼0.6 O/DOC (g/g), ∼50% decrease of UVA254, ∼60% decrease of UVA280, or ∼80% decrease of humic-like fluorescence. Within the range of 10-10 cell/mL, the bacterial concentration did not have significant effects on the required thresholds of the specific O doses or spectroscopic indicators required for bacterial inactivation. The addition of 50 mM tert-BuOH as ·OH scavenger increased the required specific ozone doses but decreased the losses of spectroscopic indicators necessary for sufficient bacterial inactivation, and also suggested that the membrane/DNA damages for bacterial inactivation were mainly attributed to the direct O attacks. The bromate concentration was determined using ion chromatography with MS/MS detection. The results showed that when O was dosed at the required thresholds for sufficient bacterial inactivation, bromate formation could usually be suppressed below 10 μg/L. The present work supports that it is possible to reach a balance between bacterial inactivation and bromate formation.

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“…ibuprofen and clofibric acid, while the E-peroxone process exhibited higher removal efficiency comparing to ozonation. Meng et al (2016) evaluated the degradation and mechanism of extracellular polymeric substances (EPS) by ozonation. Results showed that the TOC of EPS solution was reduced by 13% after ozonation.…”

Section: Chemical Treatmentmentioning

confidence: 99%

Hazardous Waste Treatment Technologies

Li¹,

Wang²,

Yu³

et al. 2017

Water Environment Research

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Degradation of extracellular polymeric substances (EPS) extracted from activated sludge by low-concentration ozonation

Cited by 82 publications

References 38 publications

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

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

Applying UV absorbance and fluorescence indices to estimate inactivation of bacteria and formation of bromate during ozonation of water and wastewater effluent

Hazardous Waste Treatment Technologies

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