Mapleton, IA Nitrate Reduction System

MAPLETON, IOWA
NITRATE REDUCTION SYSTEM

A new building was constructed to house the advanced, 400 gallons per minute nitrate reduction equipment supplied and installed in late 1997 by Krudico professionals. Also located outside is the salt storage tank which supplies an interior day storage tank with a liquid or "wet" brine solution which is used for system regeneration.

The nitrate reduction system consists of three ion exchange vessels. The system utilizes ion exchange and raw water blending to reduce the nitrate levels to acceptable limits in the city water supply. Located in the background behind operator Mike Hahn, is a day storage tank for a wet brine solution. On the right of the photo is a liquid chlorine storage room.

The Systemax 2000 programmable logic controller (PLC) is the electronic device which controls the system. Some of the Systemax 2000's responsibilities include demand meter input signal, regeneration time and sequence, capacity, the chlorinator pump output signal, individual flow rates, individual unit totalizer, and a variety of other programmable options. Located next to the Systemax 2000 are two flow meters which monitor the "treated" and "bypass" lines of the blended system.

This system utilizes the Fleck 3900 Dual Piston Metered Control Valve and 63" diameter pressure vessels. The vessels have 2" top and bottom ports for rapid loading and unloading. The process piping consists of 6" influent/effluent headers and 3" inlet/outlets on each of the valves. The Systemax 2000 is located on the back wall of the building behind the vessels.

An aerial view of the plant allows one to view the PVC process piping and supports. Also seen again is the day storage tank where liquid brine is gravity fed from the outside storage tank. The liquid brine is subsequently drawn into each tank by the control valves during regeneration.

The chlorine storage room is accessible from both inside and outside. There are two 250 gallon storage tanks, one 13 gallon storage tank, and a peristaltic chemical feed pump located in this room. The chemical feed pump is controlled by the Systemax 2000 controller. The Systemax turns the pump on during periods of water flow through the system, and powers the pump down after flow has stopped.

There is a master meter located on the plant influent which monitors all of the water that flows through the treatment plant. There is a manual totalizer readout on the meter itself, and a digital readout which indicates flow in Gallons Per Minute as well as the total gallons through the meter.

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