초록 ▼

A sewage treatment process wherein sewage is passed into a deep subterranean shaft is improved by passing a liquor of the sewage into the subterranean shaft through an inner shaft which extends only partway down into the subterranean shaft. Located at the lower proximity of the inner shaft is a mixi

A sewage treatment process wherein sewage is passed into a deep subterranean shaft is improved by passing a liquor of the sewage into the subterranean shaft through an inner shaft which extends only partway down into the subterranean shaft. Located at the lower proximity of the inner shaft is a mixing shaft. The mixing shaft extends from the lower end of the inner shaft to a point near the bottom of the subterranean shaft. Incorporated into the mixing shaft are a plurality of liquor mixing nozzles. The descending sewage liquor passes downwardly through the mixing nozzles to the bottom of the subterranean shaft. It then ascends upwardly in the subterranean shaft. The action of the descending liquor through the nozzles entrains ascending liquor from the subterranean shaft back into the descending liquor. This recirculates the liquor in the bottom of the shaft allowing for extended contact time of the liquor with the microorganisms used in the liquor to aerobically digest the sewage.

대표청구항 ▼

In a process for aerobic treatment of sewage by passing a liquor of raw sewage, an oxygen containing gas and a microorganism seed suspension in a liquid carrier into an elongated subterranean shaft by descending said liquor into the lower extremity of said subterranean shaft and allowing said liquor

In a process for aerobic treatment of sewage by passing a liquor of raw sewage, an oxygen containing gas and a microorganism seed suspension in a liquid carrier into an elongated subterranean shaft by descending said liquor into the lower extremity of said subterranean shaft and allowing said liquor to ascend to the surface of said subterranean shaft, the improvement which comprises: passing said liquor in a descending direction through an input shaft into the interior of said subterranean shaft to subject said liquor to hydrostatic pressure to effect increased solubility of said oxygen into said liquor; passing said pressurized oxygen containing liquor from said input shaft into a mixing shaft located below said input shaft and extending downwardly to the bottom reaches of said subterranean shaft; moving said liquor through said mixing shaft to deposit said liquor at the bottom reaches of said subterranean shaft; ascending said liquor up said subterranean shaft; continuously entraining a portion of said ascending liquor back into said liquor descending down through said mixing shaft by passing said portion of said ascending liquor through a plurality of openings in said mixing shaft in causing said entrained portions to be mixed within said descending liquor within said mixing shaft.