ABSTRACT
The original circa mid-1930s’ plant was upgraded in 1964 to an activated biosolids process, with chlorination for disinfection. In the later 1970s, there was a major upgrade to the facility, including a two-stage activated biosolids process with biological phosphorus removal, tertiary filtration, solids dewatering with incineration, and liquid chlorine disinfection. In 1997, additional upgrades to the facility were initiated, beginning with UV disinfection replacing the liquid chlorine system. The chlorine disinfection system is currently maintained as a back-up system. The second stage of biological treatment is not currently utilized since it is not required to achieve discharge compliance. Biological treatment is followed by their 125 ft diameter, 10.9 ft side water depth clarifiers. Clarifier effluent is polished by tertiary sand filtration and disinfected using UV prior to discharge.
