The city of Brockton, Massachusetts, is upgrading it advanced wastewater treatment facility to meet rigorous phosphorus effluent limits. To ensure the improvements would reduce the existing annual maintenance costs, CDM performed a detailed cost-benefit analysis that guided the city in purchasing new cloth filter technology. The new technology will replace the existing automatic backwash effluent sand filters, which require significantly more costly annual operation and maintenance. The new system fits into the same size and shape structures as the existing filters, providing a vastly increased filtration capacity within the same filter area. The new filtration system also reduces the volume and rate of filter backwash water.
Economic considerations aside, this filter technology increases flux capability to allow bypass elimination and reduced backwash volume, allowing the city to reliably and consistently achieve the U.S. Environmental Protection Agency's 0.2 milligram-per-liter effluent phosphorus requirement. The filter system is a critical component of the overall plant process, particularly regarding compliance with restrictive effluent limits for suspended solids and phosphorus. The Brockton project is currently under construction and is anticipated to be operational late 2007.
CLIENT: City of Brockton, Massachusetts
LOCATION: Brockton, Massachusetts