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Figure 1: Map of Five U.S. Climate Zones by State Recent feasibility studies and technical papers for various anaerobic digester gas projects were examined to determine how digester heating requirements correlate to climate (see Figure 2). These feasibility analyses and technical papers assessed digester gas projects in the following locations: Georgia (Zone 5), North Carolina (Zone 4), Oregon (Zone 3), Massachusetts (Zone 2), and Maine (Zone 1). Using these locations, the analysis determined the minimum and maximum energy requirements in terms of heating degree days. In each case, the average energy required each day (MMBtu/day) was divided by the size of the WWTF, as measured in MGD. With minimum and maximum bounds for the energy requirements, the average value for MMBtu/day/MGD was determined. This was accomplished by first plotting the data points and constructing parallel lines that roughly intersect the two highest and the two lowest data points. These two lines represent the maximum and minimum heating requirements. The average heating requirement line was developed by adding a line that divides equally the area between these two lines. Figure 2 shows the data points used, along with the minimum, maximum, and average values, according to heating degree days. Table 9 presents the minimum, maximum, and average values in tabular form. In each case, the average energy required each day (MMBtu/day) was divided by the size of the WWTF, as measured in MGD. The average values for each zone were used in the cost-to-generate analysis. 16PDF Image | Combined Heat and Power at Wastewater Treatment Facilities
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