Study of biofilms on PVDF membranes after chemical cleaning by sodium hypochlorite

Anna Piasecka; Roy Bernstein; Frans Ollevier; Filip Meersman; Caroline Souffreau; Roil M. Bilad; Karl Cottenie; Louise Vanysacker; Carla Denis; Ivo Vankelecom

doi:https://doi.org/10.1016/j.seppur.2014.12.010

Study of biofilms on PVDF membranes after chemical cleaning by sodium hypochlorite

Anna Piasecka, Roy Bernstein, Frans Ollevier, Filip Meersman, Caroline Souffreau, Roil M. Bilad, Karl Cottenie, Louise Vanysacker, Carla Denis, Ivo Vankelecom

Research output: Contribution to journal › Article › peer-review

Abstract

Sodium hypochlorite (NaOCl) is widely used to remove biofouling in membrane bioreactors (MBRs) to recover the membrane performance. In this study, the effect of membrane cleaning with different NaOCl concentrations (0.01%, 0.1%, 1% and 10% of a stock solution containing 39.92 g/L of free chlorine) on biofouling was investigated in a molasses based lab-scale MBR. Study of the bacterial biofilm community re-growth after six consecutive cleanings revealed that a minimal concentration of 0.1% NaOCl diminishes the bacterial richness and cell density on the membranes. ATR-FTIR analysis of the layer on the membrane surface revealed the presence of peaks associated with proteins and carbohydrates present in the biofouling layer and their intensity decreased after treatment with NaOCl. Analysis of the membrane performance by chemical oxygen demand (COD) measurement of the permeate and retentate showed that the rejection of the membranes after NaOCl chemical treatment was still high. The data showed that since NaOCl removes the bacterial biofilm and at the same time does not affect the membrane treatment performance, NaOCl can be recommended as a cleaning agent to remove biofouling in a lab-scale molasses based MBR.

Original language	American English
Pages (from-to)	314-321
Number of pages	8
Journal	Separation and Purification Technology
Volume	141
DOIs	https://doi.org/10.1016/j.seppur.2014.12.010
State	Published - 12 Feb 2015
Externally published	Yes

Keywords

Biofilm
Biofouling
Cleaning
PVDF membrane

All Science Journal Classification (ASJC) codes

Analytical Chemistry
Filtration and Separation

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https://doi.org/10.1016/j.seppur.2014.12.010

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title = "Study of biofilms on PVDF membranes after chemical cleaning by sodium hypochlorite",

abstract = "Sodium hypochlorite (NaOCl) is widely used to remove biofouling in membrane bioreactors (MBRs) to recover the membrane performance. In this study, the effect of membrane cleaning with different NaOCl concentrations (0.01%, 0.1%, 1% and 10% of a stock solution containing 39.92 g/L of free chlorine) on biofouling was investigated in a molasses based lab-scale MBR. Study of the bacterial biofilm community re-growth after six consecutive cleanings revealed that a minimal concentration of 0.1% NaOCl diminishes the bacterial richness and cell density on the membranes. ATR-FTIR analysis of the layer on the membrane surface revealed the presence of peaks associated with proteins and carbohydrates present in the biofouling layer and their intensity decreased after treatment with NaOCl. Analysis of the membrane performance by chemical oxygen demand (COD) measurement of the permeate and retentate showed that the rejection of the membranes after NaOCl chemical treatment was still high. The data showed that since NaOCl removes the bacterial biofilm and at the same time does not affect the membrane treatment performance, NaOCl can be recommended as a cleaning agent to remove biofouling in a lab-scale molasses based MBR.",

keywords = "Biofilm, Biofouling, Cleaning, PVDF membrane",

author = "Anna Piasecka and Roy Bernstein and Frans Ollevier and Filip Meersman and Caroline Souffreau and Bilad, {Roil M.} and Karl Cottenie and Louise Vanysacker and Carla Denis and Ivo Vankelecom",

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doi = "https://doi.org/10.1016/j.seppur.2014.12.010",

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T1 - Study of biofilms on PVDF membranes after chemical cleaning by sodium hypochlorite

AU - Piasecka, Anna

AU - Bernstein, Roy

AU - Ollevier, Frans

AU - Meersman, Filip

AU - Souffreau, Caroline

AU - Bilad, Roil M.

AU - Cottenie, Karl

AU - Vanysacker, Louise

AU - Denis, Carla

AU - Vankelecom, Ivo

PY - 2015/2/12

Y1 - 2015/2/12

N2 - Sodium hypochlorite (NaOCl) is widely used to remove biofouling in membrane bioreactors (MBRs) to recover the membrane performance. In this study, the effect of membrane cleaning with different NaOCl concentrations (0.01%, 0.1%, 1% and 10% of a stock solution containing 39.92 g/L of free chlorine) on biofouling was investigated in a molasses based lab-scale MBR. Study of the bacterial biofilm community re-growth after six consecutive cleanings revealed that a minimal concentration of 0.1% NaOCl diminishes the bacterial richness and cell density on the membranes. ATR-FTIR analysis of the layer on the membrane surface revealed the presence of peaks associated with proteins and carbohydrates present in the biofouling layer and their intensity decreased after treatment with NaOCl. Analysis of the membrane performance by chemical oxygen demand (COD) measurement of the permeate and retentate showed that the rejection of the membranes after NaOCl chemical treatment was still high. The data showed that since NaOCl removes the bacterial biofilm and at the same time does not affect the membrane treatment performance, NaOCl can be recommended as a cleaning agent to remove biofouling in a lab-scale molasses based MBR.

AB - Sodium hypochlorite (NaOCl) is widely used to remove biofouling in membrane bioreactors (MBRs) to recover the membrane performance. In this study, the effect of membrane cleaning with different NaOCl concentrations (0.01%, 0.1%, 1% and 10% of a stock solution containing 39.92 g/L of free chlorine) on biofouling was investigated in a molasses based lab-scale MBR. Study of the bacterial biofilm community re-growth after six consecutive cleanings revealed that a minimal concentration of 0.1% NaOCl diminishes the bacterial richness and cell density on the membranes. ATR-FTIR analysis of the layer on the membrane surface revealed the presence of peaks associated with proteins and carbohydrates present in the biofouling layer and their intensity decreased after treatment with NaOCl. Analysis of the membrane performance by chemical oxygen demand (COD) measurement of the permeate and retentate showed that the rejection of the membranes after NaOCl chemical treatment was still high. The data showed that since NaOCl removes the bacterial biofilm and at the same time does not affect the membrane treatment performance, NaOCl can be recommended as a cleaning agent to remove biofouling in a lab-scale molasses based MBR.

KW - Biofilm

KW - Biofouling

KW - Cleaning

KW - PVDF membrane

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EP - 321

JO - Separation and Purification Technology

JF - Separation and Purification Technology

ER -

Study of biofilms on PVDF membranes after chemical cleaning by sodium hypochlorite

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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