Study on the Disinfection Efficiency of the Combined Process of Ultraviolet and Sodium Hypochlorite on the Secondary Effluent of the Sewage Treatment Plant

The combined disinfection process of ultraviolet and sodium hypochlorite has more advantages than the single method in reducing disinfectant dosage, shortening reaction time, resisting impact water quality changes inhibiting light reactivation microorganisms. Given this, using secondary effluent a sewage plant as research object, efficiency was investigated. experimental results showed that inactivation effect UV followed by on fecal coliform inhibition microbial photoreactivation significant simultaneous disinfection. When dose 24 mJ/cm2, after with hypochlorite, only 1 mg/L required to be added, contact time min for index meet first-Class A emission standard. After disinfection, effluent’s maximum rate 26.96%. However, addition 3 hypochlorite. group reached 30.81%.