Abstract
In this study, response surface methodology was used to investigate the efficiency of the UV/chlorine process for ammonia removal and disinfection by-products reduction. A five-level three-factorial central composite design was employed to study the interaction of three independent variables, including the Cl/N molar ratio, UV dose, and pH. Ammonia removal rate and trihalomethanes (THMs) formation rate were the target responses and two quadratic models were established. The optimum conditions of maximum ammonia removal and minimum THMs formation were: Cl/N molar ratio 0.99, UV dose 93.10 mJ cm−2, and pH value 7.88, respectively. Under these conditions, the predicted ammonia removal rate and THMs formation rate by the two quadratic models were 64.03 and 34.87%, which were consistent with the verification experimental results.
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