Case Study

Clinton, MA SuperDisc Case Study

Source: WesTech Engineering, Inc.
Clinton, MA SuperDisc Case Study Thumbnail

The Clinton Wastewater Treatment Plant provides advanced wastewater treatment, including nutrient removal, for the towns of Clinton and Lancaster, Massachusetts. With an average daily flow of 3 MGD, Clinton removes phosphorus through a conventional activated sludge system followed by chemical coagulation. Discharged phosphorus can reduce oxygen levels in water bodies as a result of eutrophication. It can also decrease aquatic life.

The current regulation for the Clinton Wastewater Treatment Plant states that 1.0 mg/L of total phosphorous (TP) can be discharged into the Nashua River. The Massachusetts Department of Environmental Protection released a draft National Pollutant Discharge Elimination System (NPDES) permit stipulating phosphorus regulation changes beginning in 2014. The permit requires that the facility discharge less than 0.15 mg/L of TP from April through October, and less than 1.0 mg/L between November and March. For a safety margin and to improve environmental quality, Clinton set a treatment goal of < 0.1 mg/L phosphorus year-round.

With the change in phosphorus regulations, Clinton needs to upgrade their system and increase phosphorus removal. After Clinton’s decision to use small footprint disc filters, a series of pilot studies were completed to find the most cost effective and efficient phosphorous removal filter.