WWTP No. 2 is located on Research Forest, has a design capacity of 6.0 MGD, and is permitted for a 2-hour peak flow of 15.6 MGD. The WWTP receives raw sewage (influent) from residential dwellings and commercial businesses. The average daily flow is approximately 3.5 MGD.
Wastewater treatment at this facility consists of mechanical and manual bar screens, a grit removal unit, eight aeration basins, three secondary clarifiers, two low-head sand filters, and one cloth media filter. Sludge handling units include aerobic digesters, a gravity thickener, gravity belt thickeners, and two belt filter presses.
Influent is treated through a mechanical bar screen after reaching the influent lift station. Treated water is then gravity fed into aeration basin splitter boxes where the influent/raw is mixed with the RAS. All aeration basins utilize fine bubble diffused aeration systems that are similar to the “bubblers” in a fish tank. The mixed liquor from the aeration basins is routed to a splitter box before being gravity fed into three secondary clarifiers. The clarified effluent is then gravity fed to two low-head sand filters and one cloth media filter. Filtered effluent is further treated using chlorine disinfection.
Treated and disinfected effluent is then de-chlorinated with sulfur dioxide and discharged to Panther Branch, which feeds into Lake Woodlands.