Overcoming Escalating Biosolids Disposal Costs

Problem: The Kalamazoo (Michigan) Wastewater Treatment Plant treats a mix of residential and industrial wastewater. Industrial loading accounted for 65% of influent BOD. The city faced rising costs for biosolids handling; landfill costs increased from $17.50 per wet ton in 2008 to $158 in 2020. Solution: The city installed three Centrisys CS26-4 decanter centrifuges, which increased cake solids and substantially reduced biosolids volume.Result: The centrifuges improved the cake solids content from 16-17%, with the presses to between 21-23%, at 20-30% volume reduction. This reduced costs by $2.5 million per year. 262-747-2384; www.centrisys-cnp.com