Influence of filter aid on MBR perfomance and fouling after high salt shock

Haifeng Zhang, Liping Yang, L. Song, Lanhe Zhang

Research output: Contribution to journalArticle

Abstract

The main objective of this study was to investigate the effect of diatomite filter aid on fouling and performance of membrane bioreactor (MBR) after high salt shock. The results show that diatomite additive is an effective approach for the performance improvement of both membrane fouling and pollutants removal when MBR was suffering high salt shock. Compared with the control reactor, the performance of MBR is enhanced by addition of 60 mg·L-1 diatomite addition, the removal of COD, NH4+-N and TP increases by 4.9%, 3.2% and 74.5%, respectively. It was observed that after high salt shock the membrane fouling rate is significantly higher, about four-fold, for the contrast than for the MBR with diatomite addition. The flocculating and adsorption capacities of diatomite make soluble products of microbial metabolism (SMP) significant decrease. So, the rate of membrane fouling was significantly mitigated. Furthermore, the addition of diatomite makes mean flocs sizes (dp) and its related hydrophobic (RH) increase, which would be beneficial to the mitigation of membrane fouling.

Original languageEnglish
Pages (from-to)3212-3220
Number of pages9
JournalHuagong Xuebao/CIESC Journal
Volume65
Issue number8
DOIs
StatePublished - Aug 1 2014

Keywords

  • Extracellular polymeric substances
  • High salt shock
  • Membrane bioreactor
  • Membrane fouling
  • Soluble microbial product

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