Town of North Brookfield outlines treatment upgrades, aging clarifiers and rising sludge costs

An operator at the Town of North Brookfield wastewater treatment plant led a facility walkthrough and explained how recent upgrades changed monitoring and control — while noting several major pieces of legacy equipment remain in need of replacement.

The operator described the treatment train from headworks to outfall, showing two samples to demonstrate the difference between raw influent and treated effluent. “This is essentially what we call influent. This is what comes into the facility,” he said, and later, “This is essentially our final product. This is what goes out to the stream.” He emphasized that bacteria in the aeration basins perform most of the treatment and that secondary clarifiers are critical to keep those bacteria in the plant and out of the Forget Me Not Brook.

Why it matters: the plant must meet discharge permit limits from the Department of Environmental Protection (DEP) and U.S. Environmental Protection Agency (EPA). The operator said permit limits are reissued every five years and tightened recently, which was a primary driver of upgrades. He said the plant was upgraded…