Continued population growth east of Austin, Texas at Manville Water Supply Corporation required more water to keep ahead of the growth curve. New wells were drilled and additional water was provided by Alcoa operations; however, Manville WSC needed to treat this source water for iron and manganese. A new four million gallons per day plant was designed to meet their treatment goals. Tonka Water worked closely with the City to design custom, state-of-the-art processes to reduce wastewater volumes by 50% compared to conventional water plant designs.
Before raw water enters the filters, an inline static mixer adds caustic, chlorine and potassium permanganate. The water is then evenly split between each filter cell where it flows through IMAR™ filter media, removing the iron and manganese. Each OptaCell Plus™ pressure filter is comprised of four completely isolated cells. This unique feature allows one cell to be off-line while the other three cells continue to filter, backwash or be open to the atmosphere for inspection. From the OptaCell Plus™ filter, the water directly enters the distribution system.
The filter system includes the value-added Simul-Wash™ backwash system. The OptaCell Plus™ filters are designed to operate with either a continuous feed or intermittent feed of potassium permanganate depending on water quality parameters.
The system is also controlled by Tonka Water’s PLC-based automatic control panels which have been customized to backwash the filters by loss of head, time, or operator initiation. The duration of the backwash and other functions are operator adjustable through a color touch screen interface.
The raw water analysis summarized below reflects moderate concentrations of iron and manganese existing in the water. The treatment process has been highly effective in delivering quality water as indicated below.
|Iron (Fe)||1.08 mg/L||Not Detected|
|Manganese (Mn)||0.14 mg/L||Not Detected|