Our wastewater treatment plant is intended to remove pollutants from the wastewater before it is discharged into the receiving stream, the Antietam Creek. It employs a three-phase process, designated as primary treatment, secondary treatment and tertiary treatment. All of these steps are conventional and are approved and permitted by the Department of Environmental Protection.
Primary treatment includes screening out solids from the wastewater, grit removal and initial settling of the wastewater.
Secondary treatment picks up after the initial settling process and is achieved through biological treatment using aeration of the wastewater. Aeration is achieved by pumping compressed air into the aeration tanks, naturally occurring bacteria use the oxygen and consume the organic matter in the wastewater as food. Through this process the majority of organic pollutants are removed. The process is called the activated sludge process.
The solids that are removed from the system are digested in tanks called aerobic digesters until it is stabilized and the volatile organics are reduced to acceptable levels. This material called biosolids is then dewatered on a belt filter press and put into dumpster containers to be properly disposed of in a landfill.
Completing the tertiary treatment, additional aeration is used to remove ammonia-nitrogen then final settling occurs where the solids are separated from the clear water which is then disinfected and the treated water is discharged to the creek.