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Technology Screening Report[sub page] <br /> The purpose of Technology Screening is to identify and screen alternatives for wastewater <br /> collection,treatment and disposal technologies for further evaluation. The Town's consultants <br /> looked at technologies for decentralized and centralized facilities. <br /> ■ Decentralized technologies include individual innovative and alternative (I/A) septic <br /> systems and clustersystems serving flows of less than 10,000 gallons per day (GPD) or <br /> small wastewater treatment plants requiring a groundwater discharge permit. <br /> ■ Centralized facilities which serve large areas of town, are often municipally run and treat <br /> flows of greater than 150,000 GPD. <br /> Collection systems, disinfection technologies, effluent disposal, and water reuse technologies <br /> were also evaluated. <br /> The screening report also looked at other methods for reducing nitrogen through stormwater <br /> control, fertilizer management, oyster propagation, and groundwater treatment. These methods <br /> would reduce nitrogen to varying degrees,but they are difficult to rely on for consistent, <br /> widespread performance. Many are not currently recognized by regulatory agencies for nitrogen <br /> removal. <br /> Screening criteria were developed to weigh the relative advantages and disadvantages of each <br /> technology. Criteria included(1) suitability for local conditions; (2) implementability or ability <br /> to construct, operate,monitor and manage; (3)performance, (4) long-term maintenance, (5) <br /> efficiency of land use, (6) aesthetics including visual impacts and potential odors, (7)public <br /> acceptance and political feasibility, (8) institutional concerns such as permitting issues and state <br /> approval, and (9)relative cost when compared to other technologies. <br /> Report Recommendations <br /> The consultants recommended 13 of 20 decentralized technologies be further considered based <br /> on cost, performance and other considerations (i.e., aesthetics, land use and long-term <br /> maintenance). Three types of small wastewater treatment facilities, or package plants,were <br /> advanced due to their flexibility in treating relatively small flows and the level of current use in <br /> Mashpee. <br /> The Town evaluated 10 centralized treatment technologies and recommended 4 for further <br /> consideration. Nine technologies for water reuse technologies were considered to provide <br /> enhanced nitrogen removal downstream of the treatment plant prior to reusing the treated <br /> effluent; for instance, in irrigating a golf course. Disinfection processes (chlorination, ozonation <br /> and ultraviolet) were evaluated because it's likely any treatment facility constructed in the PPA <br /> will be required to provide disinfection. <br /> The study also evaluated 5 collection system technologies. The report recommended rg avi1y <br /> and low pressure systems. Effluent discharge technologies need to be specific as to the <br /> discharge site to minimize impacts to surface and groundwater. Eight alternatives were <br /> 7 <br />