Salinity effect on a biofilm-MBR process for shipboard wastewater treatment

Cheng Sun*, TorOve Leiknes, Jan Weitzenböck, Bernt Thorstensen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

The salinity effect on a biofilm membrane bioreactor (biofilm-MBR) was investigated to treat shipboard wastewater. The membrane permeability decreased and poorer permeate quality was obtained when salt shocks (influent salt concentration: 30 g/L NaCl for 3 h, 6 h, and 9 h respectively) took place. On long duration step tests, a better membrane performance with lower fouling rate was observed when smaller salt concentration increments occurred, with acclimation of the biofilm taking place with time. Results indicate that the membrane fouling mechanism is quite complicated with fluctuation of feed water salinity, where SMPs concentrations resulting from the microorganisms' response and/or salinity variation play a main role in membrane fouling. However, surface charge effects on particles and the membrane surface starts to dominate the membrane fouling with the increasing salt concentration.

Original languageEnglish (US)
Pages (from-to)380-387
Number of pages8
JournalSeparation and Purification Technology
Volume72
Issue number3
DOIs
StatePublished - May 11 2010

Keywords

  • Biofilm-MBR
  • Ceramic membrane
  • Salinity
  • Shipboard wastewater

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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