| 摘要 |
<p>PURPOSE:To treat law night soil and the sludge in a purifying tank simultaneously by settling and separating the activated sludge in a liquid mixture after aeration of the night soil, returning part thereof to the aeration treatment and aerating the sludge in an inflow purifying tank and the excess sludge mixture. CONSTITUTION:After law night soil receives pretreatments such as settling in a pretreating tank 1, the night soil is stored in a storage tank 2, from which the same is introduced into a tank 3 for primary treatment where the night soil receives an anaerobic or aerobic digestion treatment. The liquid after the primary treatment is fed together with diluting water to a tank 4 for secondary treatment, where the liquid receives secondary treatment by aeration and is fed into a settling tank 5 so that the liquid is subjected to the sepn. of activated sludge. The sludge of the purifying tank treated together with the low night soil is treated in a pretreatment tank 6, thereafter the sludge is stored in a storage tank 7, from which the sludge is fed into an aerating tank 8. In the tank 8, the sludge of the purifying tank and the activated sludge drawn from the tank 5 are mixed, and the mixture is aerated for, for example, about 3 days.</p> |
