METHOD OF REMOVAL OF PHOSPHOR FROM THE SEWAGE LIQUOR Russian patent published in 2006 - IPC C02F3/30 C02F103/20 C02F103/32 

FIELD: purification of the urban sewage and industrial waste waters.

SUBSTANCE: the invention is pertaining to the field of purification of the urban sewage and also the waste waters of the food-processing industry and cattle-breeding complexes and is intended for removal from the urban sewage liquor and the industrial waste waters of phosphor in the form of ions PO₄ ^3-. The method of removal of phosphor from the sewage liquor includes the mechanical, biological, physicochemical purification with return of the phosphor depleted compacted active sludge from the sludge concentration tank into the aerotank, with feeding into the sludge concentration tank of the sludge water enriched with the volatile fatty acids produced in the acidoficator working with the crude sediment from the primary settlers in the mode of the first stage of the anaerobic fermentation. At that the redundant active sludge released from the ions PO₄ ^3- in the sludge concentration tank is added into the acidoficator. Due to injection into the acidoficator of the redundant active sludge the shortage of the organic substances is compensated at the low values of the biochemical oxygen demand of the initial sewage liquor and it ensures the necessary amount of the volatile fatty acids fed into the sludge concentration tank for realization of the dephosphatization process. The method is characterized by reduction of the operational costs of purification of the sewage and industrial waste waters from phosphor.

EFFECT: the invention ensures the necessary amount of the volatile fatty acids fed into the sludge concentration tank for realization of the dephosphatization process.

1 dwg