Abstract
The main goal of this study was to investigate the effects of ozone oxidation pretreatment and powdered activated carbon (PAC) addition on the efficacy of natural organic matter (NOM) removal by coagulation. Relatively high iron chloride doses from 100 to 200 mg FeCl3/L were applied, due to the high dissolved organic carbon (DOC) content (10.27 ± 0.49 mg C/L) of the raw water investigated, with PAC used in doses of 5–30 mg/L. Preozonation was carried out at doses of 0.2–1.3 mg O3/mg DOC. Jar test results indicate that baseline coagulation with the optimal coagulant dose (200 mg FeCl3/L) achieved was 39% DOC and 54% UV254 removals. PAC addition improves coagulation efficacy in NOM removal by up to 9% DOC and 25% UV254. The best results were obtained in combination with 0.6 mg O3/mg DOC, 5 mg/L PAC and 200 mg FeCl3/L (removals of 58% DOC and 72% UV254), and were a significant improvement compared to coagulation alone.
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