Calcium ion on membrane fouling reduction and bioflocculation promotion in membrane bioreactor at high salt shock

Haifeng Zhang, Xue Fan, Bin Wang, Lianfa Song

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Fouling propensity of activated sludge in membrane bioreactor (MBR) is closely related to the disturbance of a salt shock. In this work, the characteristics of membrane fouling and bioflocculation were compared in two laboratory-scale MBRs (one with calcium addition, MBR-Ca, the other without, MBR-C) with a transient salt shock. Particle size distributions, zeta potential, relative hydrophobicity, modified fouling index, the content of polysaccharides, proteins and calcium ions in different layers of sludge were monitored prior to, during and after the salt shock. Comparison with MBR-C showed that the recovery time and fouling rate of MBR-Ca were reduced by 50% and 34%, respectively. Remarkable variations of sludge properties in terms of bioflocculation, such as larger particle sizes, higher relative hydrophobicity and zeta potential, lower polysaccharides in supernatant, higher proteins/polysaccharides ratio in slime and loose bound extracellular polymeric substances, were observed in MBR-Ca after the salt shock.

Original languageEnglish
Pages (from-to)535-540
Number of pages6
JournalBioresource Technology
Volume200
DOIs
StatePublished - Jan 1 2016

Keywords

  • Bioflocculation
  • Calcium ion
  • Membrane bioreactor
  • Membrane fouling rate
  • Salt shock

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