PURPOSE: To efficiently remove COD existent in waste water, by biooxidizing waste water in the process of manufacturing thermosetting resin, introducing it into an ozone contact device of specified length, and adding the specified amount of ozone at a pH of 5.8W8.4 to oxidize COD.
CONSTITUTION: Waste water in the process of manufacturing thermosetting resin is biooxidized and then introduced into an ozone contact device having effective contact length of 2W4m. Hereon, ozone in an amount of 0.6W2.0 by wt. ratio to the amount of COD to be removed existent in water to be treated residing in the ozone contact device is introduced, and ozone oxidation is performed in the neutral zone where the pH of water to be treated is 5.8W8.6. Hence, difficultly decomposable COD existent in the waste water is removed. Since suspended substance as the result of the biooxidation of BOD is mixedly existent in said biooxidized water, it is necessary to preremove the suspended substance by precipitation separation in advance of the ozone oxidation. In addition, it is preferable to adjust the suspended substance to below 10mg/l conjunctly using sand filtration.
TANIGUCHI KEIJI
MIZUNO KANEO
| JPS5781883A | 1982-05-22 | |||
| JPS5769303A | 1982-04-28 | |||
| JPS5768191A | 1982-04-26 |