Fate of NaClO and membrane foulants during in-situ cleaning of membrane bioreactors: Combined effect on thermodynamic properties of sludge

Haifeng Zhang, Ming Sun, Lianfa Song, Jingbo Guo, Lanhe Zhang

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

In this study, the fate of sodium hypochlorite (NaClO) and detached membrane foulants and their impacts on the thermodynamic properties of raw sludge were investigated in a membrane bioreactor (MBR). It was found that about 20.3% of the total NaClO was potentially released into the bulk sludge, which significantly altered the raw sludge surface properties, such as a reduction in the number of surface electron donor components (γ) and an increase in surface hydrophobicity. After exposure to NaClO, the treated sludge had a higher adhesive and cohesive propensity compared to the raw sludge. Based on the extended Derjaguin-Landau-Verwey- Overbeek (XDLVO) theory and the batch filtration test results, the detached foulants potentially aggregated with the treated sludge and form the reconstructed sludge. The reconstructed sludge had a high protein (PN) level in the extracellular polymeric substances (EPS), with a higher membrane fouling potential compared with the raw sludge.

Original languageEnglish
Pages (from-to)146-152
Number of pages7
JournalBiochemical Engineering Journal
Volume147
DOIs
StatePublished - Jul 15 2019

Keywords

  • Extracellular polymeric substances
  • In-situ cleaning
  • Interactions energy
  • Membrane bioreactor
  • Membrane foulants

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