Tsurumi America aerators assist Illinois town

Apr. 04, 2021

Aerators from Tsurumi America, Glendale Heights, Ill., a division of Tsurumi Manufacturing, assisted the Illinois town of Teutopolis avoid a costly dredging project and still meet new pollutant standards. The aerators were used and proved effective in properly oxygenating the water and reducing ammonia/nitrogen to adequate levels, the company said.

The facultative partial-mix lagoon system had treated wastewater from the town’s 1,530 residents since 1976. The potential for noncompliance existed with tighter legislation. In 2013, the state introduced discharge limits for ammonia and nitrogen. Aeration and some mixing would be required to meet regulations, while also improving the levels of residual dissolved oxygen in the effluent.

AquaTec, a Rockford, Ill.-based water and energy solutions provider, brought in three Tsurumi 50TRN45.5 submersible aerators. The self-aspirating aerators are designed for trouble-free, long-life operation with stainless steel wear parts. Any component that comes into contact with water is manufactured from cast iron or stainless steel and the bearings and oil bath around the shaft are both oversized.

AquaTec, along with partner Vandevanter Engineering, were convinced the TRN aerators would be the answer.

“It seemed inevitable that we would need to initiate an immediate dredging of the lagoon,” said Jeff Strey, operations manager, AquaTec. “But, after speaking with Carl Pals of the treatment plant, with all the expense and labor that had resulted from having to repair the floating aspirators several times per year, as well as the resulting loss of treatment during downtime, they were keen to avoid finding themselves in the same situation further down the line and decided to look for alternatives first.”

Instead of dredging, the submersible aerators were installed at the bottom of the lagoon, where they could produce a bottom up mixing of the settled sludge with the aim of reducing ammonia and nitrogen levels to within permitted limits, achieving required residual dissolved oxygen levels in effluent and reducing sludge to extend the life of the lagoon system.

“Satellite images from before and after the deployment of our TRN aerators graphically show the curtailment of algae and weed growth due to nitrification of the ammonia present in the lagoon system. By choosing a ‘bottom-up-‘ system, Teutopolis can avoid having to dredge its lagoons and also managed to easily achieve the minimum limit of 5mg/l residual dissolved oxygen,” Strey said.

“It could finally be assured of year-round biochemical oxygen demand (BOD) removal to comply with legislation,” he added.

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