WATER TREATMENT APPARATUS

摘要

PURPOSE: To improve the quality of treated water by holding bacteria to a highly active state by arranging a catalyst bed of which the height is made less than that of the activated carbon bed of a biological activated carbon tank on the downstream side of an ozone contact tank and passing treated water through a catalyst bed to decompose dissolved ozone before introducing the same into the biological activated carbon tank. CONSTITUTION: An ozone stagnation tank 9 is arranged on the downstream side of an ozone contact tank 8 and a biological activated carbon tank 18 is further arranged on the downstream side thereof. A catalyst 23 for decomposing dissolved ozone is arranged to the inner peripheral surface of the ozone stagnation tank 9. As the catalyst 23, activated carbon is pref. used and the height h0 of the catalyst bed 24 of the tank 9 is set less than the height (h) of the activated carbon bed 20 of the biological activated carbon tank 18. Water w0 to be treated is treated with ozone introduced from an air pipe 11 in the ozone contact tank 8. The water TW in which ozone is dissolved is passed through the catalyst 23 to decompose dissolved ozone. Next, the treated water is introduced into the biological activated carbon tank 18.