Development of an integrated membrane process for water reclamation

C. H. Lew, J. Y. Hu, L. F. Song, L. Y. Lee, S. L. Ong, W. J. Ng, H. Seah

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

An integrated membrane process (IMP) comprising a membrane bioreactor (MBR) and a reverse osmosis (RO) process was developed for water reclamation. Wastewater was treated by an MBR operated at a sludge retention time (SRT) of 20 days and a hydraulic retention time (HRT) of 5.5 h. The IMP had an overall recovery efficiency of 80%. A unique feature of the IMP was the recycling of a fraction of RO concentrate back to the MBR. Experimental results revealed that a portion of the slow- and hard-to-degrade organic constituents in the recycle stream could be degraded by an acclimated biomass leading to an improved MBR treatment efficiency. Although recycling concentrated constituents could impose an inhibitory effect on the biomass and suppress their respiratory activities, results obtained suggested that operating MBR (in the novel IMP) at an F/M ratio below 0.03 g TOC/g VSS.day could yield an effluent quality comparable to that achievable without concentrate recycling. It is noted in this study that the novel IMP could achieve an average overall TOC removal efficiency of 88.94% and it consistently produced product water usable for high value reuse applications.

Original languageEnglish
Pages (from-to)455-463
Number of pages9
JournalWater Science and Technology
Volume51
Issue number6-7
DOIs
StatePublished - 2005

Keywords

  • Biomass acclimation
  • Integrated membrane process
  • Membrane bioreactor
  • Reverse osmosis
  • Slow- and hard-to-degrade compounds
  • Water reclamation

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