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Electrical aeration is used intensively in reactor basins at activated-sludge wastewater treatment plants to supply the mixing and oxygenation needed for digestion. Officials at Eden, North Carolina, investigated the ability of solar-powered circulation technology (SPC) to reduce their operational expense. The goal was to meet National Pollution Discharge Elimination System (NPDES) standards while reducing grid-powered aeration and operating a single SPC unit in one basin. Study objectives were to compare effluent water quality parameters and grid-power usage and cost during one year of SPC treatment with comparable data from the immediately preceding year when only aeration was used.
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