Biosolids are generated throughout the treatment process. The Zeeland CWP utilizes two Aerobic digestors to reduce the solids biologically, then sending the digested solids to a Sieve Drum concentrator to thicken sludge suitable for land application. The stabilized solids are then stored in six tanks equaling 1.6 MG, where Nutrigo Environmental Services removes the nutrient rich solids periodically and injects them into farmer's fields, the Zeeland CWP's regulated residual management plan is closely monitored by the State of Michigan Environment/Great Lakes and Energy (EGLE).