Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/19021
Title: Assessment of synergistic effect of UV/H2O2 integrated disinfection process
Authors: SOWPATI JAYAKER
Keywords: Disinfection, Hydroxyl radical, TOC, Turbidity, Anions , Synergy, UV/H2O2
Issue Date: 29-May-2010
Source: SOWPATI JAYAKER (2010-05-29). Assessment of synergistic effect of UV/H2O2 integrated disinfection process. ScholarBank@NUS Repository.
Abstract: The aim of this study was to assess the synergistic effect of the UV/H2O2 integrated disinfection system and to assess the effect of water matrix on synergism and hydroxyl (*OH) radical concentration in UV/H2O2 integrated disinfection system. Virus chosen for this study was MS2 coliphage. The experimental conditions chosen were UV doses of 10, 20 & 40 mJ/cm2 and H2O2 concentrations of 10, 20 & 30 ppm. A Low pressure UV (LP) lamp emitting at 254nm, a Medium pressure UV (MP) lamp emitting full spectrum ranging between 200 and 600 nm and a thirdly a MP in combination with a long pass filter emitting at wave length > 295 nm (FMP), were the three light sources adopted in this study. The disinfection efficiency of UV and H2O2 were studied independently and compared with the integrated UV/H2O2 system to verify the existence of synergistic effect. The effect of synthetic water matrix was assessed by variation of the parameters such as TOC, turbidity and presence of bicarbonate ions and chloride ions. The combined effect of real water matrix was assessed using filtered (by ultrafiltration membrane) local lake water. Slight synergies were observed, which might be due to the hydroxyl radical generation. The hydroxyl radical concentration was also estimated by the consumption of a probe compound during the course of disinfection, to understand and assess the synergistic effect. In general TOC positively influenced the synergy and negatively influenced *OH radical production. Turbidity effected both synergy and *OH radical production negatively. Bicarbonate ions negatively influenced both synergy and *OH radical production. Chloride ions in general negatively influenced synergy and negatively influenced *OH radical production. Real water matrix positively influenced synergy only at 30 mg/L H2O2 and negatively influenced *OH radical production.
URI: http://scholarbank.nus.edu.sg/handle/10635/19021
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