Changes in biosolids conditioning, from thermal to polymer, caused the multiple hearth furnaces to drop the incineration capacities by 66%. The Incinerators designed to autogenously incinerate 26 dry tons a day of biosolids at 35% solids were incinerating 8 dry tons of
biosolids at 18% solids. The Washington Suburban Sanitary Commission (WSSC) embarked on a program to maximize the incineration rates in the multiple hearth furnaces (MHF). This paper summarizes some of these modifications.
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