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Membrane Water Treatment
  Volume 9, Number 4, July 2018 , pages 245-253

Impacts of sludge retention time on membrane fouling in thermophilic MBR
Mahir İnce and Alikemal Topaloğlu

    The aim of this study is to investigate the membrane fouling in a thermophilic membrane bioreactor (TMBR) operated different sludge retention times (SRTs). For this purpose, TMBR was operated at four different SRTs (10, 30, 60 and 100 days). Specific cake resistance, cake resistance, gel resistance, total resistance, MFI (modified fouling index) and FDR (flux decrease ratio) were calculated for all SRTs. It was observed that flux in the membrane increases with rising SRT although the sludge concentrations in the TMBR increased. The steady state flux was found to be 31.78; 34.70; 39.60 and 43.70 LMH (Liter/m2/h) for the SRTs of 10, 30, 60 and 100 days respectively. The concentrations of extracellular polymeric substance (EPS) and soluble microbial product (SMP) decreased with increasing SRT. The membrane fouling rate was higher at shorter SRT and the highest fouling rate appeared at an SRT of 10 d. Both the sludge cake layer and gel layer had contribution to the fouling resistance, but the gel layer resistance value was dominant in all SRTs.
Key Words
    EPS; flux; fouling; MBR; resistance; SMP; SRT; thermophilic
Mahir İnce: Gebze Technical University, Department of Environmental Engineering, Kocaeli, Turkey
Alikemal Topaloğlu: Bulent Ecevit University, Department of Environmental Engineering, Zonguldak, Turkey

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