Triangle Wastewater Treatment Plant
Triangle Wastewater Treatment Plant
The TWWTP is rated for an average daily flow of 12 million gallons per day and specifically designed to meet future nutrient load requirements for the Jordan Lake nutrient management strategy. The TWWTP serves the southeast portion of Durham County inside and outside the Durham City limits, and serves the Research Triangle Park areas within Durham County.
TWWTP Treatment Systems
Influent Pump Station
Sized for 12 MGD average flow, and located 2’ above the 100 year flood elevation to reduce flooding risk.
Fine Screens
Removes insoluble materials larger than 1/4” prior to the beginning of the treatment process.
Grit Removal
Removes small dense inorganic materials prior to the beginning of the treatment process.
Five Stage Biological Nutrient Removal System
Provides the ability to biologically remove nitrogen and phosphorous during treatment with carbon source addition.
Chemical Polishing
Sodium aluminate is used to remove additional phosphorus from water by chemical precipitation.
Clarifiers
Quiescent zone where biomass is separated from treated water.
Tertiary Filters
Filtering to remove additional biomass.
Ultraviolet Disinfection
Disinfection process without harmful by-products.
Reaeration
Supplemental dissolved oxygen provided prior to discharge to Northeast Creek.
