The ever-expanding Seneca wastewater treatment plant in Eagan, MN required a pump capable of accurately dosing 15 percent sodium hypochlorite ("hypo").

Hypo has outstanding disinfection properties and is used in wastewater treatment to kill off bacteria before being discharged back in the environment and in water treatment as one the primary methods of drinking water disinfection. It can also be a challenging product to pump. Hypo tends to off-gas, causing some pump types to vapor lock-particularly diaphragm pumps-and can also be chemically aggressive depending on the concentration.

After evaluating several pump choices, the engineers for the expansion to the Seneca facility chose a peristaltic hose pump. Ten pumps were put to immediate use in a new area of the treatment plant. A wastewater plant needs to run as cost efficiently as possible, and the plant personnel were impressed with the long hose life and ease of maintenance in changing the hose. Each pump achieves flow rates up to 48 gph at pressures up to 175 psi. The pumps can pump both gas and liquid, ensuring the liquid stream receives a consistent dose.

Click here to read the article published in Pumps & Systems of March 2010.

Written by Tom Eisemon, national sales manager for Verder.

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