Pre-handling of biological sludge

A system for pre-treating excess sludge from a bio-treatment before incineration in a recovery boiler.

A system for treating excess sludge with black liquor from the evaporation plant before incineration together with black liquor in the recovery boiler.
Black liquor is used as a medium to hydrolyze bacteria in the sludge.
By hydrolysis, the cell membranes burst and thus bound fluid is released
Hydrolysis also reduce the risk of scaling on heating surfaces.