| 摘要 |
PROBLEM TO BE SOLVED: To provide the highly efficient biological sewage treating method capable of completely treating the sewage of every kind and the useful liq. obtained by the treatment. SOLUTION: Sewage is completely treated as follows. Namely, a considerable number of the small solid bodies each contg. a microorganism activating substance are put in a water-permeable vessel to constitute a continuous microorganism activating substance feeder 3, and the plural feeders are suspended in the sewage in an aeration tank 4. When the operation is started, a considerable amt. of the nutritive powder 5 contg. the microorganism activating substance is introduced into the aeration tank 4 having the feeders 3 to mass-propagate the microorganism, and the sewage is biologically treated in a short time. A specified amt. of a microorganism activating substance- contg. soln. 8 is periodically supplied to the first aeration tank 4a at midnight every day, the excess sludge settled in the final sludge separation tank 6 is returned to the first aeration tank 4a directly or through an excess sludge concentrating and water storing aeration tank 7 to normalize the system with the sewage treating tank group, water passage group and pump group as the circulating line, and only the supernatant separated in the tank 6 is discharged. The supernatant is utilized in various uses. |
