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<br /> <br />Bay Area Clean Water Agencies | City of San Leandro Final Report | 13 <br />The estimated capital and O&M costs for the recommended optimization strategy are presented in <br />Table 4-3 for the average flows during 2016-2025. In addition, the estimated costs per pound of <br />nutrient removed are presented in Table 4-3. These unit costs are estimated based on the cost of <br />the elements needed to reduce nitrogen or phosphorus, respectively. <br />Table 4-3. Projected Costs and Nutrient Unit Costs for Optimization Strategy <br />Parameter Units Dry Season1 Year Round1 <br />Design Flow mgd 4.8 5.2 <br />Ammonia, TN and TP Removal <br />Capital2 $ Mil 10.9 11.9 <br />Annual O&M $ Mil/yr 0.3 0.4 <br />Present Value O&M3 $ Mil 3.4 4.3 <br />Present Value Total3 $ Mil 14.3 16.2 <br />Unit Capital Cost8 $/gpd 2.2 2.3 <br />Unit Total PV Cost8 $/gpd 2.9 3.1 <br />TN Removal <br />Capital2,4 $ Mil 10.0 10.9 <br />Annual O&M4 $ Mil/yr 0.2 0.3 <br />O&M PV3,4 $ Mil 2.4 3.3 <br />Total PV3,4 $ Mil 12.4 14.2 <br />TN Removed (Ave.)6 lb N/d 300 370 <br />Annual TN Removed (Ave.)7 lb N/yr 110,000 134,000 <br />TN Cost4,9 $/lb N 11 11 <br />TP Removal <br />Capital2,5 $ Mil 2.0 2.0 <br />Annual O&M5 $ Mil/yr 0.2 0.2 <br />O&M PV3,5 $ Mil 1.6 1.8 <br />Total PV3,5 $ Mil 3.6 3.8 <br />TP Removed (Ave.)6 lb P/d --** 8 <br />Annual TP Removed (Ave.)7 lb P/yr --** 2,900 <br />TP Cost5,9 $/lb P --** 130 <br />1. Dry Season = facilities sized for May 1 through September 30 loads but operate year round; year round = facilities sized for year round loads <br />and operated year round. <br />2. Costs are referenced to the ENR SF CCI for November 2017 at 12,015. Costs do not include changes in solids handling or changes in energy <br />requirements in other unit processes. <br />3. PV is calculated based on a 2 percent discount rate for 30 years. <br />4. Based on cost for nitrogen removal only. <br />5. Based on cost for phosphorus removal only. <br />6. The average daily nutrient load reduction over the 10-year project duration. <br />7. The average annual load reduction over the 10-year project duration. The calculation considers days with no discharge. <br />8. The unit load reduction cost was calculated by dividing the capital or total present value by the design flow. <br />9. The unit load reduction cost was calculated by dividing the total present value for the nutrient of interest by the nutrient load reduction over the <br />10-year projection duration e.g., Total PV for TN Removal divided by (Annual TN Removed times 10-years)). <br />** The optimization strategy will not reduce total phosphorus loads during the dry. Rather, it will improve the load reduction reliability.