Feasibility study of advanced nom-reduction by hollow fiber ultrafiltration and nanofiltration at a Swedish surface water treatment plant

Research output: Contribution to journalArticle

Abstract

Membrane technology, i.e., ultrafiltration and nanofiltration, is growing in popularity, as it is a space efficient alternative for surface water treatment. Two types of hollow fiber membranes were tested in a fully equipped and automated pilot at a Swedish water treatment plant. Raw water was treated by a nanofilter and by coagulation before an ultrafilter. Operation parameters recorded during these trials have been the basis for cost estimations and assessments of environmental impact, comparing the two membrane modules to the existing conventional treatment. The membranes required lower chemical consumption, but led to increased costs from membrane modules and a higher energy demand. Compared to the existing treatment (0.33 €/m3), the operational costs were estimated to increase 6% for ultrafiltration and 30% for nanofiltration. Considering the low emissions from Nordic energy production, the membrane processes would lower the environmental impact, including factors such as climate and ecosystem health. Greenhouse gas emissions would decrease from 161 g CO2-eq/m3 of the existing process, to 127 g CO2-eq/m3 or 83 g CO2-eq/m3 for ultrafiltration and nanofiltration, respectively. Lower chemical consumption and less pollution from the sludge leaving the water treatment plant lead to lower impacts on the environment.

Details

Authors
Organisations
External organisations
  • Sweden Water Research AB
  • Sydvatten AB
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Water Engineering

Keywords

  • Cost analysis, Environmental impact, Nanofiltration, Natural organic matter, Ultrafiltration
Original languageEnglish
Article number150
JournalWater
Volume8
Issue number4
Publication statusPublished - 2016
Publication categoryResearch
Peer-reviewedYes