Membrane and Water Treatment

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Investigation of influence of temperature and solid retention time on membrane fouling in MBR

  • Mirzavandi, Atoosa (Faculty of Chemical Engineering, Sahand University of Technology) ;
  • Hazrati, Hossein (Faculty of Chemical Engineering, Sahand University of Technology) ;
  • Ebrahimi, Sirous (Faculty of Chemical Engineering, Sahand University of Technology)
  • Received : 2018.08.23
  • Accepted : 2019.02.20
  • Published : 2019.03.25
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Abstract

This study aimed to investigate the effect of temperature and solid retention time (SRT) on membrane fouling in a membrane bioreactors (MBRs). For this purpose, a lab-scale submerged MBR system was used. This system operated at two SRTs of 15 and 5 days, three various temperatures (20, 25 and $30^{\circ}C$) and hydraulic retention time (HRT) of 8 h. The results indicated that decreased the cake layer resistance and increased particles size of foulant due to increasing temperature and SRT. Fourier transform infrared (FTIR) analysis show that the cake layer formed on the membrane surface, contained high levels of proteins and especially polysaccharides in extracellular polymeric substances (EPS) but absorbance intensity of EPS functional groups decreased with temperature and SRT. EEM analysis showed that the peak on the range of Ex/Em=220-240/350-400 in SRT of 15 and temperature of $30^{\circ}C$ indicates the presence of fulvic acid in the cake. In addition, as the temperature rise from 20 to $30^{\circ}C$, concentration of soluble microbial products (SMP) increased and COD removal reached 89%. Furthermore, the rate of membrane fouling was found to increase with decreasing temperature and SRT.

Keywords

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