The Effect Of Preozonation, Ozone/Hydrogen Peroxide Treatment, And Nanofiltration On The Removal Of Organic Matter From Drinking Water

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Abstract
Pilot scale experiments were performed to evaluate the ability of ozonation, ozone/hydrogen peroxide treatment and nanofiltration to reduce levels of organic matter, mutagenicity, total adsorbable halogens, color and turbidity from purified and bank-filtered surface water rich with humic material. Ozonation and ozone/hydrogen peroxide decreased the amount of organic material from drinking water by about 20 percent measured as TOC and CODMn. Color and turbidity level reductions were 49 and 11 percent, respectively. Ozonation reduced the AOX concentrations formed during postchlorination from 150 μgL−1 to 75 μgL−1. The addition of hydrogen peroxide further improved the removal to 37 and 26 μgL−1 depending on the ratio of H2O2/O3. The mutagenicity reduction followed the same pattern: without ozonation the chlorination-derived mutagenicity was 1,450 net revertant L−1 after the ozonation 700 and after the H2O2/O3 treatment from −1 depending on the H2O2/O3 ratio. Nanofiltration appeared to be the most effective way to remove organic material. The removal of TOC was 68%, CODM 72%, color 90%, turbidity 68%, AOX 88%, and mutagenicity 85%.