Due to continuing problems of iron and water hardness, the City of Bremen decided to build its own water treatment plant. The Plant Superintendent had previous knowledge of the Dualator® treatment system. The City of Bremen decided to design the plant around Tonka Water’s proposed Dualator® VI and softening system. Raw water entering the plant has iron, manganese, and hardness; which need to be reduced prior to distribution. The plant is able to produce an excess of water, which it will be selling to a nearby town. Based on these sales, the equipment will pay for itself in five to six years.
The water treatment facility incorporates a 12’ diameter x 28’ over all height (OAH) Dualator® VI filter with two 6’ diameter x 9’-9” RidION™ ion exchange softeners. The Dualator® VI has four treatment processes: degassing and aeration: chemical feed of chlorine and potassium permanganate; detention time for chemical disinfection and floc growth; and dual media filtration for iron and manganese removal. The RidION™ ion exchange vessels are used for hard water softening and were designed to achieve hard water blending. This blending of the softened and hard water is a cost saving feature for Bremen, with the final hardness effluent blended to 100 mg/L.
The raw water analysis summarized below reflects moderate concentrations of iron and calcium hardness. The Tonka Water treatment process has been highly efficient in delivering high quality water.
|Iron (Fe)||2.0 mg/L||0.01 mg/L|
|Total Hardness||500 mg/L||100 mg/L|