AERATION TANK IN FILTHY WATER TREATING PROCESS USING ACTIVATED SLUDGE

摘要

PURPOSE:To secure aggregation of microorganism in an aeration tank and to stabilize purifying function by arranging proportion of the amt. of introduced org. material to the amt. of microorganism in the tank to freely adjustable condition and enabling charge and discharge of aeration unit to the tank smoothly performable and holding contact materials always at below the water level in the tank. CONSTITUTION:An aeration tank 2 having a manhole 12 with a lid at the top and an air-dispersing device 1 in the inside is communicated to a settling tank 9 through a communicating pipe 13. The water levels of the both tanks 2, 9 are regulated to be same level by an overflow trough 14 provided in the settling tank 9. The tank is constituted so as to enable charge and discharge of units 3 through the manhole 12 freely and to hold contact materials 3a at below the level of the treated water WL in the tank 2. By increasing or decreasing the number of the unit 3 to be charged to the tank 2, the proportion of the amt. of org. material to be introduced to the amt. of microorganism is adjustable optionally.