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Removal of excess activated sludge by aerobic mineralization.

K Lopatowska

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%.

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Key concepts: Activated sludge, Aerobic digestion, Chemistry, Aeration, Mineralization (soil science), Pulp and paper industry, Mixed liquor suspended solids, Digestion (alchemy)