The Milton Regional Sewer Authority (MRSA) operates a wastewater treatment plant (WWTP) under National Pollutant Discharge Elimination System (NPDES) Permit #PA0020273 serving the areas including the Boroughs of Milton and Watsontown and portions of West Chillisquaque, Turbot and Delaware Townships. This Permit was effective August 1, 2009 and was in effect until July 31, 2014 (this permit has been administratively extended by DEP).
The MRSA also operates the Potts Grove WWTP located in East Chillisquaque Township (ECT). This system began initial operation on April 1, 2004. This is a totally independent system from the MRSA’s main WWTP.
The Milton Wastewater Treatment Plant consists of an existing primary plant which was put into initial operation in 1955. This small plant was upgraded to a secondary treatment facility with construction beginning in March of 1975. The new secondary plant was a cooperative effort between the Borough of Milton and American Home Foods (AHF), now ConAgra, Inc. The upgraded plant consists of grit removal, primary sedimentation, pH neutralization, nutrient addition, conventional activated sludge process, secondary settling, chlorine disinfection, both dissolved air flotation and sieve drum concentrator thickening, belt filter press (BFP) sludge dewatering, aerobic digestion, and landfill disposal of sludge. The original primary treatment plant is still intact and was incorporated into the new secondary treatment flow scheme.
The effluent from the primary plant flows into the aeration tanks while the sludge is treated aerobically and then dewatered by means of a BFP and disposed of via landfilling. The influent wastestreams are from two separate sources which are the industrial waste from ConAgra and the remainder is from the MRSA service area. Both of these flow sources are metered, sampled, and tested individually. Both of the influent sources go through separate primary settling basins but are treated jointly thereafter. The ConAgra wastewater receives nutrient addition (Monosodium Phosphate and Urea) and any necessary pH adjustment just prior to entry into the ConAgra primary clarifiers. After flowing through two (2) aeration tanks, two (2) secondary clarifiers and then two (2) serpentine chlorine contact tanks, the effluent flow discharges through five (5) ports of an outfall diffuser line directly into the West Branch of the Susquehanna River.
The Milton Regional Sewer Authority is currently under construction to upgrade the treatment plant. The upgrade is dubbed the Wastewater to Energy (Ww2E) project and should be completed in early 2017.