| 摘要 |
PROBLEM TO BE SOLVED: To reduce wastewater treatment costs. SOLUTION: A downflow liquid film type ice storage tank 4 and a wastewater tank 2 which collects wastewater from a wastewater supply soured and stores it, recycling water tank 3 are provided. During the operation of freezing separation, wastewater stored in the tank 2 is supplied to the ice storage tank 4 and stored as ice in the ice storage tank 4. During the operation of recycling water production, instead of the supply of wastewater from the tank 2 to the ice storage tank 4, ice stored in a cooling coil 4C is melted, and the water is supplied to the tank 3. Instead of ice accretion in the coil 4C by the operation of freezing separation, concentrated wastewater left in the tank 2 is discharged from the tank 2.
|
