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Table 15 presents the number of WWTFs and the total capacity for each digester gas utilization case, with an estimated payback period of less than seven years (see Section 4.2.1 for an explanation of the three digester gas utilization cases). Table 15: Economic Potential of U. S. Wastewater Treatment Facilities (Scenario 1 – Most Facilities Do Not Utilize Digester Gas Prior to CHP) Digester Gas Utilization Case Prior to CHP WWTFs Analyzed Number of Facilities Evaluated Facilities with Economic Potential Potential Capacity (MW) Case 1: Digester Gas Used for both Digester Heating and Space Heating Case 2: Digester Gas Used for Digester Heating Only Case 3: Digester Gas Not Used Those Utilizing Digester Gas (not for CHP) Those Utilizing Digester Gas (not for CHP) Those Not Utilizing Digester Gas Total 203 88 74 203 88 74 1,148 574 186 1,351 662 260 The analysis revealed no difference in economic potential between Case 1 (i.e., no natural gas purchases displaced) and Case 2 (i.e., CHP heat displaces natural gas space heating). This is because most of the heat recovered from CHP units is required for digester heating, leaving little (if any) thermal output for space heating, For Case 3 (i.e., CHP heat displaces natural gas for both digester and space heating), full thermal credit is given for recovered CHP heat, assuming that natural gas is used to heat the digester and provide space heating prior to CHP. Scenario 1 shows economically feasible CHP potential at 662 WWTFs across the country, with a national potential capacity of 260 MW. Since Case 1 and Case 2 draw from the same pool of WWTFs (i.e., those that are currently using their digester gas), their potentials are not additive. The estimated economic potential of 260 MW represents approximately 63 percent of the 411 MW of national technical potential presented in Section 4.1.3. Scenario 2: All Facilities Use Digester Gas to Heat Digester Scenario 2 assumes that all of the WWTFs larger than 1 MGD that do not already employ CHP use their digester gas for heating the digester and use natural gas for any additional space heating needs prior to CHP implementation; therefore, all facilities evaluated under this scenario fall under Case 2 (i.e., using digester gas to heat only the digester prior to CHP implementation). As mentioned previously, Case 2 is the most common situation for a WWTF that has not already implemented CHP. Table 16 presents the number of WWTFs with economic potential and the total capacity under Scenario 2. 25PDF Image | Combined Heat and Power at Wastewater Treatment Facilities
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