PURPOSE: To provide a purification device of simple construction wherein the working ratio is high and maintenance can be very easily performed and further functions for removing BOD and nitrogen is excellent.
CONSTITUTION: A purification device including a settling separation tank D, a biological membrane filtration tank B loaded with granular, porous carriers 43, and a treatment water tank H is provided, wherein a treatment water circulating device 54 which performs biological nitrification and denitrification, while a part of treatment water in the tank H which has been treated by being successively passed through the tank D, tank B, and tank H is returned to the tank D for circulation, is provided, and tne ratio between the circulation rate of the treatment water from the treatment water circulating device and the flow rate of raw water is in the range of 2-5.
YOKOO AKIRA
NAGAYA TOSHIRO
| JPS63185495A | 1988-08-01 | |||
| JPS60147290A | 1985-08-03 | |||
| JPH047099A | 1992-01-10 | |||
| JPH04277098A | 1992-10-02 | |||
| JPS634899A | 1988-01-09 | |||
| JPS63229144A | 1988-09-26 | |||
| JPH04354592A | 1992-12-08 | |||
| JPH0295597U | 1990-07-30 |