METHOD AND DEVICE FOR CLEANING DOMESTIC WASTE WATER Russian patent published in 2020 - IPC C02F9/14 C02F3/30 C02F1/74 C02F3/06 C02F3/22 

FIELD: water purification.

SUBSTANCE: group of inventions is intended for purification of domestic waste water treatment of suspended substances, compounds of nitrogen, phosphorus and hard-to-oxidize organic compounds. Method comprises feeding effluents, first purified from coarse impurities, into chamber 1, at the stage of anaerobic purification in the presence of anaerobic bacteria of floating silt with content of 2.5–3.0 g/l and dissolved oxygen of not more than 1.0 mg/l. Through overflow hole 7 waste water from chamber 1 together with the sludge part is supplied to chamber 3 for the aerobic cleaning stage, performed when air is supplied from compressor via hose 18 on cassette 6 with biofilters located in area of overflow hole 7. Then, afterpurification of waste water in chamber 3 on cassette 6 with biofilters arranged in area of overflow hole 7 into chamber 4. Part of clarified flow carrying active sludge is supplied from chamber 3 by submersible pump 5 into basket of aerator 11 for reflux of loading 12, from which liquid is distributed through holes in plates 15 so that 10–15 % of flow is returned to chamber 1, and 85–90 % of flow is fed into chamber 3. Clarified effluent passes final sludge in pyramidal truncated part of chamber 4 and is brought out of device by means of drain pipe or submersible pump 5. In another embodiment, a device is provided, which is a cylindrical container with sewage water inlet branch pipes and clarified water outlet, divided into four chambers by vertical partitions, in which holes are made, through which sewage circulation inside device is performed. In the top part of the device there is a basket of aerator 11 with loading 12 and plate 15 with holes for distribution of liquid flowing down on the loading into chambers 1 and 3 of the device. Inlet branch pipe is located in anaerobic cleaning chamber 1. Chamber 2 of aerobic cleaning includes hose 18 of air supply from compressor and cassette 6 with bio filters, located in area of overflow hole 7 into chamber 3. Afterpurification chamber 3 includes biofilter cassette 6 located in the area of overflow hole 7 into chamber 4, as well as submersible pump 5 to supply part of clarified flow carrying active sludge into basket of aerator 11. Chamber 4 comprises clarified water outlet pipe and submersible pump 5.

EFFECT: group of inventions provides reduction of device dimensions, as well as quality of treated water according to BOD, COD, compounds of nitrogen, phosphorus, difficult-to-oxidize organic compounds corresponding to maximum allowable concentration for discharge into fisheries for fishery purposes.

6 cl, 2 dwg, 3 tbl