Patent ID: 10752529

Abstract:
The invention relates to a method for carrying out biological purification of wastewater with the aid of activated sludge, in which the wastewater is introduced into a tank for phosphor elimination (P tank), then into an activated sludge tank (B tank) and then into at least one sedimentation and recirculation tank (SU tank), in which a number of operating cycles are carried out, including a sludge return phase, a recirculation phase, a pre-sedimentation phase and a draw-off phase (S phase, U phase, V phase, and A phase respectively), wherein the method further includes the elimination of settleable solids of the inflow, the storage of the produced primary and excess sludge and the reduction of the rising of the water level in the wastewater purification system by using an additional tank (S tank), wherein the S tank is hydraulically connected with the P tank, the P tank with the B tank, and the B tank with the at least one SU tank, wherein the wastewater is first introduced into the S tank, then into the P tank, then into the B tank and subsequently into the at least one SU tank, wherein in the S phase the thickened activated sludge is introduced from the at least one SU tank into the P tank, in the U phase the volume of the at least one SU tank is mixed, in the V phase the activated sludge is settled, and in the A phase the treated wastewater is flowing out of the system and wherein the settled sludge of the S tank is transported from time to time to another special treatment plant.