METHOD AND DEVICE FOR TREATMENT OF WASTEWATER USING ACTIVATED SLUDGE PROCESS WITH ENHANCED NITROGEN AND PHOSPHORUS REMOVAL

摘要

A method of wastewater treatment with enhanced removal of nitrogen and phosphorus through activated sludge process which includes processes running in an anaerobic zone (2), an anoxic zone (3), an oxic zone (4) and a final settlement zone (5) of a bioreactor (1) with controlling of aeration, recirculation and mixing of the mixed liquor by intermitted operation, wherein the intermitted operation of aeration and recirculation of the mixed liquor is controlled in such manner that short aeration periods alternate with short recirculation periods and one short aeration period together with one short recirculation period constitutes one cycle. A device for wastewater treatment with the activated sludge process with increased removal of nitrogen and phosphorus comprising a control unit (22) equipped with at least one daily time schedule with fixed length of short aeration periods and short recirculation periods, and optionally also of short idle periods, within one cycle, or equipped with at least one algorithm for converting the lengths of short aeration periods, short recirculation periods, and optionally also of short idle periods, within one cycle, depending on the measured quantities by means of on-line measuring devices (42, 43), wherein the control unit is connected with at least one valve (21, 35) which is controlled by the control unit and is arranged on at least one air branch (26, 29, 30, 31, 32) for.