The rapid population increase of the Village of Mahomet near Champaign, IL encouraged the design of a water treatment system that would provide the village with an adequate water supply for the next 20 years. The new project was designed to expand the existing site with the addition of Dualator® VI filters. The Village Water Superintendent, after a tour of the Tonka Water factory, decided to incorporate the Simul-Wash™ process into the new filters. He also added softening to the treatment system to provide a higher quality water to the community.
The three package treatment systems incorporate aeration, detention and filtration in a vertical configuration in a single vessel. The aerator adds oxygen to the raw water supply to accomplish oxidation of the raw water iron. The aerated water is collected at the bottom of the aerator and discharged through a static mixer into a 30-minute detention chamber, then collected and routed to a four-cell filter. The iron is filtered out through a sand and anthracite filter media. The water is then pumped to four 9’ diameter softeners where hardness is removed through an ion exchange process.
Each RidION™ softener vessel has the capacity to treat 224,000 gallons of filtered water between regenerations. The softened water is blended with a raw water bypass flow creating a treatment plant effluent of 100 mg/L of hardness. Following the softeners; fluoride, polyphosphate and chlorine are added to the water conditioning it for distribution and consumption. The system is controlled by Tonka Water’s PLC-based automatic control panel with a touch pad.
The raw water analysis summarized below reflects high concentrations of iron existing in the water. The treatment process has been highly effective in delivering quality water as indicated below.
|Iron (Fe)||1.5 mg/L||0.05 mg/L|
|Hardness||341 mg/L||Blended to 100|