The City of Marshall owns and operates the Robert J. Swalwell Wastewater Treatment Facility at 801 Industrial Road. The plant was renamed in 1997 in honor of Bob Swalwell upon his retirement after 43 years of service to the City. The facility currently treats about 1.5 million gallons of wastewater every day. The wastewater originates from domestic and industrial sources within the system’s service area, which includes the City of Marshall and some outlying areas, such as Lyon Lake. The plant is in continuous operation and the effluent must meet the requirements of a National Pollutant Discharge Elimination System (NPDES) permit issued by the Michigan Department of Environmental Quality. The 6 member staff at the facility includes a superintendent, 4 operators, and an IPP coordinator. The staff conducts daily analysis and ongoing operational evaluation to ensure continuing adherence to these permit standards. Along with the above duties, staff is responsible for the operation and maintenance of fourteen lift stations located throughout the community.
Operations: The plant utilizes an activated sludge process with the addition of ferric chloride for phosphorus removal. The effluent from the plant is disinfected with chlorine and then treated with sulfur dioxide to remove any residual chlorine prior to discharge. Biosolids are stabilized with lime for pathogen control and then land applied to agricultural ground to recycle nutrients.
The goal of the Marshall Wastewater Treatment Plant is to achieve the highest degree of treatment possible to protect the natual resources and the people of the State of Michigan.