Biological Nutrient Removal Restores River Habitat on Long Island

WesTech Engineering, Inc. of Salt Lake City, Utah, is helping to restore the river habitat of the Patchogue River and the Great South Bay by employing innovative technologies for the removal of nutrients being discharged by the Patchogue Wastewater Treatment Plant (WWTP) located on the southern shore of Long Island in New York. As a part of this expansion and upgrade, WesTech supplied two STM-Aerotor™ Biological Nutrient Removal Systems and two 55-foot-diameter secondary clarifiers featuring the proprietary Clarifier Optimization Package (COP™) design.

The Patchogue WWTP had a peak flow capacity of 0.5 MGD. The new STM-Aerotor systems and COP Clarifiers are part of an expansion that has increased the plant capacity to 0.8 MGD with provisions for near term expansion to 1.2 MGD to meet increased population growth.

Historically, the Patchogue River has been used for fishing and clamming. With continued recreational use and increased discharges from nearby industries, the river habitat had become polluted and the local wildlife was threatened. Additional regulations were put into place to remediate this pollution and restore the waters for clamming. However, with the area’s growing population, the Patchogue WWTP was running out of capacity, making it difficult to continue to meet these new discharge regulations.

WesTech’s STM-Aerotor Process and COP Secondary Clarifiers have proven effective in removing biological nutrients and improving water quality at the Patchogue WWTP. They have worked together to reduce carbonaceous biochemical oxygen demand (CBOD), total suspended solids (TSS), and total nitrogen (TN) to well below the mandated levels, making the Patchogue WWTP one of the most efficient plants in the state

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