Company Name: Cecil County, Maryland
Location: Cecil County, Maryland
Type of Work: Wastewater Treatment
Delivery Method: Design / Build
The George and Lynch Design-Build Team recently completed design, construction and start up of the 1.0 million gallons per day (MGD) Meadowview Treatment Plant for Cecil County, Maryland.
Award of the project was based on previous design-build experience, technical approach and competitive cost. Cecil County requested that proposals be based on a treatment process design concept contained in its Facilities Plan. Although the County’s original concept was a widely used approach, G&L and its team members, D. Preston Lee, Jr., P.E., Inc. and URS Corp., identified an option, which best met the County’s needs. The option proposed by G&L was more reliable, easier to operate and could be expanded to increase capacity to the County’s ultimate need of 1.5 MGD with minimal future construction. Prior to entering the main treatment process, the influent wastewater passes through a state of the art screening unit known as a Rotomat, manufactured by Lakeside Equip. Co. The heart of the treatment system is a modification of the oxidation ditch activated sludge treatment process, known as the Orbal Process, developed by US Filter Corp. The Orbal consists of three concentric oval rings which has an overall dimension of 143 feet long by 122 feet wide. The pre-cast, post tensioned concrete structure has a total volume of 1,200,000 gallons. Its in-channel disk aerator, creates a highly efficient process that not only meets all requirements for reduction of biochemical oxygen demand (BOD) but also biologically reduces both phosphorus and nitrogen. Following clarification in two circular clarifiers, the effluent is further polished with disk filters, ultra violet disinfection and post aeration prior to discharge.
Immediately upon start up, the plant met the stringent new permit requirements for surface water discharge into a tributary of the Christiana River.