Uses of fluorescence excitation-emissions indices in predicting water treatment efficiency

Research output: Contribution to journalArticle


Membrane filtration is a possible alternative for the increase of the natural organic matter (NOM) content in the raw water sources in boreal areas. In a pilot study, a new hollow fiber nanofilter (HFNF) has been tested. Water from four raw water sources were treated in membrane pilot plants, and three full-scale conventional plants were sampled. Three established fluorescence indices, humification index (HIX), fluorescence index (FI) and freshness index (β:α), were used for characterization, and were related to NOM removal by the two treatment methods Although the NOM removal in the treatment processes were related to SUVA, HIX has only a weak correlation to the total organic carbon (TOC) reduction of the HFNF, and none for the conventional treatment. FI and β:α are both correlated to the TOC reduction of the HFNF. Water hardness has a logarithmical correlation to the TOC reduction by the HFNF, plausibly due to moderation of the membrane surface. FI and β:α have potential to predict the efficiency of the HFNF and conventional treatment processes, and could be used online to identify changes in the raw water which affects the process efficiency.


External organisations
  • Sydvatten AB
  • Sweden Water Research AB
  • Vatten och Miljö i Väst AB (VIVAB)
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Water Engineering


  • Drinking water treatment, Fluorescence indices, Nanofiltration, Natural organic matter
Original languageEnglish
Pages (from-to)249-257
Number of pages9
JournalJournal of Water Process Engineering
Publication statusPublished - 2017 Apr 1
Publication categoryResearch