Treatment of nanofiltration and reverse osmosis concentrates: Systematic study of coagulation, softening and anion exchange

Sarah E.H. Deavenport, Treavor H. Boyer, Katherine C. Graf

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Membrane processes are becoming more prevalent. However, disposal and treatment of membrane concentrate from nanofiltration (NF) and reverse osmosis (RO) are major challenges to implementing membrane treatment processes. Intermediate treatment of membrane concentrate, between primary and secondary membrane stages, has the potential to increase system recovery rates and decrease the volume of concentrate produced. However, there is a need to better understand physical-chemical treatment of membrane concentrate. This work systematically evaluated lime softening, ferric sulfate coagulation, and ion exchange as individual, intermediate treatment processes for membrane concentrate. Six membrane concentrates with varying concentrations of calcium, dissolved organic matter (DOM) and sulfate were chosen for this study. Maximum removal of calcium, DOM and sulfate was achieved by ion exchange. The results of this work show that physical-chemical treatment of NF/RO concentrate is capable of producing treated concentrate with calcium and DOM concentrations approximately equal to the initial source water.

Original languageEnglish (US)
Title of host publicationAMTA/AWWA Membrane Technology Conference and Exposition 2013
Pages610-623
Number of pages14
StatePublished - Dec 19 2013
Externally publishedYes
EventAMTA/AWWA Membrane Technology Conference and Exposition 2013 - San Antonio, TX, United States
Duration: Feb 25 2013Feb 28 2013

Publication series

NameAMTA/AWWA Membrane Technology Conference and Exposition 2013

Other

OtherAMTA/AWWA Membrane Technology Conference and Exposition 2013
CountryUnited States
CitySan Antonio, TX
Period2/25/132/28/13

Keywords

  • Concentrate treatment
  • Ion exchange
  • Lime softening
  • Membranes
  • Nanofiltration

ASJC Scopus subject areas

  • Water Science and Technology

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