In this study, disinfection effect of coliform group treated with ozone was analyzed for the effluent discharging from activated sludge treatment process in hospital wastewater treatment plant. Based on these results, it aims to get basic data to establish the disinfection facility in hospital wastewater treatment, suggesting affecting factors according to hydraulic retention time of the activated sludge process and design basic factors necessary to ozone disinfection. Removal efficiencies of coliform group for the effluent according to HRT such as 4hr, 8hr, 12hr were analyzed using a lab-scale activated sludge process, respectively. To decay the microorganism regulates the CT value multiplied disinfectant concentration by contact time. CT value is highly correlated with a removal efficiency of coliform group and according to increasing an injected ozone concentration, the CT value was increased.. When HRT was 4, 8, 12 hours , CT value takes place at minimum condition 50, 40, 334 mg/L-min, respectively.

This study of hospital wastewater by activated sludge wastewater treatment facility for your use of the UV disinfection process in the HRT and the UV intensity UV disinfection coliform group by evaluating the effectiveness of the disinfection facilities to meet basic data is for. Study the active sludge process coliform group emissions alone will not meet the accepted standards of the disinfection process needs to be separate. Active sludge from the same UV dose settling water interfere with my a particle substance acts as an argument between the disinfection effect a point of difference, which requires the removal of material a particle before in disinfect. The higher the UV intensity coliform group HRT long the effects of the disinfection was higher, permitted emission standards 3,000 EA/mL to meet UV dose said the 82 mJ/cm2. Existing water pollution prevention facilities, the design of the UV dose 2,310 mJ 1m/cm2 the a safety factor 50% of the company considered the same as after consideration, 120 mJ/cm2 to about 19 times higher than the results of the experiment setup, and of the existing water pollution prevention facilities UV disinfection equipment is installed, the excess.

The average BOD concentration was found to be about 269mg/L before a process innovation, but after the innovation, it became 30mg/L, which satisfied the effluent standard of 120mg/L. The removal effluent standard of 120mg/L. The removal efficiency was about 60～80%, and the concentration of the treated water was found th be low. after the process innovation, the average COD concentration was 29mg/L, and the CODmn removal efficiency became low to the level of about 65～76%, which was found lower than the effluent standard of 130mg/L. After the process innovation the SS average concentration of the treated water was 13mg/L, which was lower than that before the innovation (32mg/L). By the activated sludge process innovation, the SS removal efficiency was improved to be 30～70%. The average concentration of total coliform before the process innovation was 6100 count/mL because an Activated sludge process only occasionally pass over the allowed standard(The average number of the total coliform of Activated sludge process treated water was about 8100 count/mL), UV disinfection process was introduced. after the introduction, the average number of the total coliform was 1800 count/mL, which satisfied the allowed effluent standard of 3000 count/mL.