PROCESS OF BIOLOGICALLY REMOVING PHOSPHORUS FROM WASTE WATERS Russian patent published in 2007 - IPC C02F3/30 

FIELD: waste water treatment.

SUBSTANCE: invention relates to processes of biologically treating domestic and compositionally equivalent industrial waste waters. Process comprises consecutive holding of a consortium of microorganisms removing organic and mineral impurities from waste waters under anaerobic, anoxide, and aerobic conditions in container constructions with intensive mass exchange provided by stirrers, pumps, and air bubbling. Recycled active sludge from secondary settlers is mixed with fresh waste water stream having passed grates and sand-catchers. Resulting mixture is subjected to flotation treatment, after which flotation concentrate is held for at least half-hour in anaerobic bioreactors at continuous stirring and clarified fluid with sludge water is loaded to denitrificator along with circulating stream of sludge mix from denitrificator outlet and anaerobically treated flotation concentrate. Further, sludge mix from denitrificator is routed to nitrificator, wherein it is subjected to air bubbling. Biomass of excess active sludge augmented under aerobic conditions of nitrificator is dewatered to cake state and subjected to biocomposting under aerobic conditions in mixture with sawdust without loss of phosphorus so that phosphorus-rich biohumus is obtained.

EFFECT: reduced volume of container constructions and power consumption on removal of phosphorus from waste water and increase of phosphorus in biohumus obtained from active sludge grown on treatment plant.

1 dwg