HIGH-DEGREE WATER PURIFICATION SYSTEM

摘要

PURPOSE: To prevent the dissolved ozone included in water to be treated subjected to a treatment in an ozone contact vessel from adversely affecting the treatment in a biologically active carbon column. CONSTITUTION: The high-degree water purification system including the ozone contact vessel 1 and the biologically active carbon column 2 is provided with an aeration tank 6 having an air diffusion pipe 8 behind the ozone contact vessel and before the biologically active carbon column and is provided with an aeration air quantity controller 20 for controlling the quantity of the air to be sent into the air diffusion pipe 8 in accordance with the dissolved ozone concn. of the water to be treated in the lower bottom of the air diffusion pipe installed in the aeration tank. As a result, the dissolved ozone remaining after the ozone treatment is prevented from adversely affecting the treatment in the biologically active carbon treatment column.