Oxidation of microcystin-LR with chlorine and permanganate during drinking water treatment

Juan L. Acero, Eva Rodríguez, Maria E. Majado, Ana Sordo, Jussi Meriluoto

Research output: Contribution to journalArticleScientificpeer-review

25 Citations (Scopus)

Abstract

The oxidation of microcystin-LR (MC-LR) present in natural waters with chlorine and potassium permanganate under real drinking water treatment conditions has been investigated in the present work. The natural waters were spiked with MC-LR, using the typical concentration of 5 μgL-1 found in natural waters. The influence of some operational parameters such as the initial oxidant concentration, pH and temperature and of some drinking water quality parameters such as the NOM and ammonia content has been studied. The initial chlorine concentration and the temperature have a positive effect on MC-LR elimination. However, the pH exerts a negative influence on the MC-LR elimination by chlorine, which indicates that HOCI is the main active oxidant species. High concentrations of NOM and ammonia, which consume chlorine, impede the elimination of MC-LR. During the oxidation with permanganate, the initial permanganate concentration and the temperature have a positive effect on MC-LR removal, while the pH and the ammonia content do not exert any influence on its oxidation. However, high concentrations of NOM reduce the extent of oxidation of MC-LR with permanganate.

Original languageEnglish
Pages (from-to)371-380
Number of pages10
JournalJournal of Water Supply: Research and Technology - AQUA
Volume57
Issue number6
DOIs
Publication statusPublished - Sep 2008
MoE publication typeA1 Journal article-refereed

Keywords

  • Chlorine
  • Drinking water
  • Microcystin-LR
  • Oxidation kinetics
  • Permanganate

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