WASTE WATER BIOLOGICAL TREATMENT METHOD Russian patent published in 2005 - IPC

FIELD: waste water treatment.

SUBSTANCE: method comprises sorption and activation in biocenosis of activated sludge or waste water/activated sludge mixture in pressure conduit in the process of aeration of waste water/activated sludge mixture performed at least twice in receiving tank of pumping unit and during pumping through pressure conduit with degree of air oxygen-in-water saturation at least 15-20 mg/L accompanied by low-intensity cavitation treatment performed in receiving tank of pumping unit with cavitation number G=0.1-0.4 and during pumping through pressure conduit with cavitation number G=0.02-0.04. Separation of treated water and retention of swelled sludge are effected in sedimentation tank mounted in outlet of conduit and incorporating plane modules with secured biological charge and connecting pipes for discharging clarified water, for exhausted sludge, and water-sludge mixture. Swelled sludge is recycled into aeration zone is accomplished by way of picking water-sludge mixture in amount at least 0.2 g/L from the middle part of sedimentation tank.

EFFECT: lowered treatment expenses, simplified equipment, diminished required areas, combined several process operations, and improved quality of treated water.

1 tbl