MVP Case Study

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Brian Rabe, a specialist in decentralized wastewater treatment for Cascade Earth Sciences, uses Orenco's MVP Control Panels for timed dosing of sand and gravel filters. Especially for systems that experience huge variances in wastewater flows. "I designed a sand filter for a restaurant that averages 600 gpd," says Rabe. "But on weekends and special occasions, the flow increases considerably. Last Mother's Day, it nearly quadrupled, to 2,200 gpd."

To prevent prolonged dosing of a single area of the restaurant's sand filter during high flows, Rabe used an MVP to program a second, override setting. When a high flow condition exists, the system pumps the same small doses of effluent through the sand filter's distributing valve, but at much shorter intervals. Once the override float drops down, the system returns to pumping at normal intervals. "With the MVP, I can even have a third timer setting: one that backs the pumps off - without shutting them down - during low-flow periods. And it does all this automatically . . . no more going out to manually adjust the settings," says Rabe. "The MVP works for me. It takes programmable timers a step further."