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r <br /> 6. Stratford Ponds Wastewater Treatment Facility <br /> Identification and History. The wastewater treatment facility at Stratford Ponds was built in <br /> 1996 and services most of the Stratford Ponds housing development. The Stratford Ponds <br /> WWTF is in the Shoestring Bay subwatershed of Popponesset Bay. <br /> Process Description. The major components of the WWTF facility at Stratford Ponds include a <br /> lifting station, primary settling tanks, AmphidromeTM reactors, clearwells, AmphidromeTM Plus <br /> reactors, and effluent disposal (see Figure 6-12). <br /> ;i <br /> Wastewater is pumped from one lifting station and flows into two AmphidromeTM treatment <br /> trains. The AmphidromeTM process is a fixed-film, sequencing batch type process designed for <br /> nitrogen removal. It combines biofilter technology with an anoxic settling tank, a clearwell, and ! <br /> a denitrification process. Primary treatment for each treatment train occurs in an anoxic settling <br /> tank. Tank "A" holds 37,440-gallons and Tank "B" holds 33,600-gallons. Wastewater then <br /> a <br /> flows by gravity from the settling tank through the biofilter in the 9.5' x 10' x 4' aerated <br /> AmphidromeTM reactor and into the 11,000-gallon clearwell. The AmphidromeTM reactor <br /> alternates between aerobic and anoxic treatment as the cycle is repeated. Sludge is collected and <br /> t <br /> returned to the primary settling tank. In addition, wastewater flows to a 4-ft diameter anoxic �} <br /> AmphidromeTM Plus reactor, which contains a Tetra denitrification filter. The denitrified effluent <br /> then cycles back to the clearwell. The final effluents from the clearwells of the two treatment <br /> trains are combined at this point and discharged to 20 leaching pits.. Each pit is 16 feet in <br /> diameter, has an effective depth of 12 feet, and has a leaching surface area of 800 fe. <br /> The treatment process has also been designed so that methanol can be fed to the AmphidromeTM <br /> Plus reactors in the future, but it is not currently used. <br /> Flow Capacity. This facility is permitted to discharge 35,500 gpd (no design flow data was <br /> available beyond what was identified on the permit). The 2004/2005 data showed a peak flow of <br /> Mashpee Sewer Commission /� Stearns St Oder,LLC <br /> Final Needs Assessment Report [ � �m�,�n e,oioee«Ncxms,9 <br /> 00074.7 6-27 <br />