Abstract: It is of great significance to reduce the sludge treatment and disposal cost and protect the ecological environment. The effect of industrialized treatment of refinery biochemical excess sludge was studied by using SMR unit. The operation results showed that the biochemical excess sludge with the water content of 98.3% was treated by SMR unit, the dewatering performance of sludge was improved significantly, the average water content of residue was 57.1%, the sludge amount was reduced by 99.4%, the average VSS removal rate was 78.3%, the BOD₅/COD ratio of digestion liquid was 0.31, and the deep reduction of sludge were realized.

Key words: biochemical excess sludge, catalysis, water content, deep dehydration