Abstract:
The objective of this research was to study the efficiency of coliphage disinfections from raw water by low pressure ultraviolet lamp. The effect of disinfections efficiency and exposure time on coliphage removal was investigated. The contaminate substance in this study were turbidity (5, 10, 20, 30 NTU), humic Acid (0.5, 1.0, 3.0, 5.0 mg/l), tannic acid (0.5, 1.0, 3.0, 5.0 mg/l), lignin (0.5, 1.0, 3.0mg/l). It was apparent that an increase in exposure time resulted in an increase in disinfesction efficiency by ultraviolet ray will increase. Moreover, the coliphage disinfection efficiency was decreased in the presence of suspended solid (turbidity) together with natural organic matter (Lignin, Tannic acid, Humic acid) in raw water. For water sample with only coliphage, the efficiencies were 97%, 99.9%, 99.999% when exposure time were 0.17, 1.66, 19.9 minutes and coefficient of coliphage removal, k=2.8239 min. -1 (n=3). Turbidity was found to have the most inference effect on coliphage removal. Type and concentration of natural organic matters could affect k values as lignin significantly lower the k value than in the case of tannic acid and humic acid.