BIOLOGICAL TREATMENT OF WASTEWATER

摘要

In the embodiments of the invention described in the specification, an arrangement for biological treatment of wastewater includes a basin (10) with an aeration region (18) and a clarification region (20) separated by a movable wall (16) having a passage (26) between the bottom of the wall and the bottom of the basin. The aeration region (18) includes a plurality of diffuser arrangements (36) for aerating the wastewater and the clarification region (20) includes a sludge removal duct (52) and at least one turbulence generator (72) for periodically stirring up sludge particles which have been deposited on surfaces of the clarification region (20) remote from the sludge removal duct (52) and recirculating sludge through the the wall passage (26) to the aeration region (18) and permitting sludge to resettle on surfaces closer to the sludge removal duct (50). The movable wall (16) may be positioned to include one or more diffuser arrangements (30) from the aeration region (18) whithin the clarification region (20).