Removal of excess activated sludge by aerobic mineralization.
The removal of excess activated sludge from biological purification plant treating crude oil refining wastewaters by the method of aerobic digestion was studied. In stationary system 58% of excess sludge was removed within 32 days. In semicontinvous system (with daily addition of sludge) 85--64% of the sludge was removed, depending on amount of excess activated sludge added. Enrichment of the aerating air in oxygen (10% v/v) increased the efficiency of sludge digestion by about 10%.
D000332:Aerobiosis; D009584:Nitrogen / Q000032:analysis; D010100:Oxygen; D010758:Phosphorus / Q000032:analysis; D012722:Sewage; D014865:Waste Disposal, Fluid
D012722:Sewage; D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen