title: Removal of excess activated sludge by aerobic mineralization.
abstract: 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%.
mesh_terms: D000332:Aerobiosis; D009584:Nitrogen / Q000032:analysis; D010100:Oxygen; D010758:Phosphorus / Q000032:analysis; D012722:Sewage; D014865:Waste Disposal, Fluid
chemical_list: D012722:Sewage; D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen