Disposing of Secondary Sludge (Biosludge) in the Recovery Boiler, 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings

Secondary sludge (biosludge) is the most problematic residue of the effluent treatment process when it comes to disposal due to the difficulty in dewatering it to an acceptable level. The high moisture content (often more than 80%) makes it difficult and costly to landfill or to incinerate in a power boiler. Several mills in Europe, going as far back as 1994, have elected instead to hydrolyze the secondary sludge and mix it in the black liquor at the evaporators to burn it in the recovery boiler. For a typical integrated mill, secondary sludge dry solids are equivalent to about 1% of the black liquor solids.

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