Polished to Perfection

A treatment process with aerobic and anaerobic cells and a polishing reactor enables a plant in northwest Iowa to meet ammonia permit levels
Polished to Perfection
Workers from Penro Construction unload 6-foot-square, 8-foot-tall polishing modules and place them on pallets.

The three-cell, 6-acre aerated lagoon at the Remsen (Iowa) Wastewater Treatment Plant could not meet new ammonia permit levels of less than 4 mg/l in winter and 2 mg/l in summer. The lagoon averaged 14 mg/l in summer and 27 mg/l in winter.

Each 12-foot-deep cell held 5 million...

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