| 摘要 |
A combination system and plant includes a sewage treatment conduit in which liquid sewage to be treated is conveyed along an extended continuous loop or recirculating path, with means for introducing additional sewage at least at one point along the conduit, and with means for feeding at least a portion of the liquid from the conduit through the cooling condensers of an operating plant and back into the sewage treatment conduit. The system includes propulsion and treating means for maintaining at least a minimum rate of flow in the conduit to prevent settling of solids and for aerating the liquid. A plant cooling system pumping means preferably serves as one propulsion means for moving the liquid along through the conduit. The minimum rate can be maintained in case the flow of liquid through the cooling condensers of the power plant is shut down, and the conduit may include connecting means completely or partially bypassing the plant. Liquid in the conduit is aerated both for cooling it to the degree required for reuse in the cooling system and for oxygen enrichment to promote the desired sewage treatment. Liquid is removed from the sewage treatment conduit to settling tanks at a rate substantially equal to the rate of incoming flow of sewage less evaporation and other losses. Bacteria laden sewage solids in the settling tanks are returned to the treatment conduit near the entrance of the original raw sewage entrance. This returned sewage seeds the raw sewage with colonies of active bacteria. The sewage solids will eventually build up to an excess and this excess is later incinerated with the plant fuel, or burned in an individual incinerator, or used for other purposes, e.g., as fertilizer.
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