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<br /> <br />Bay Area Clean Water Agencies | City of San Leandro Final Report | 11 <br />Table 4-1. Optimization Strategy Project Elements <br />Capital Elements Operating Elements <br />Implement chemically enhanced primary treatment <br />(CEPT) <br />· Add metal salt chemical feed facilities <br />· Add polymer chemical feed facilities <br /> <br /> <br />· Operate the chemical feed facilities <br />Operate the aeration basins in series <br />· Replace the existing aeration basin overflow pipes <br />layout. The pipes would most likely require <br />replacement due to corrosion <br />· Modify a portion of the first train to operate as an <br />anoxic zone <br />· Add a blower to meet the additional demand <br />associated with nitrification <br /> <br />· Operate in a new mode that the operations staff will <br />need to get accustomed to <br />· Maintain the additional blower <br />Operate the aeration basins in step feed mode <br />· Add additional piping to facilitate feeding the <br />aeration basins along the length <br /> <br />· Operate in a new mode that the operations staff will <br />need to get accustomed to <br /> <br />Table 4-2 presents the estimated effluent nutrient loads for the optimization strategy as previously <br />described. The values presented for the current discharge loads and the discharge loads after <br />optimization represent the average for the period between 2016 and 2025. <br />Table 4-2. Projected Discharge Nitrogen and Phosphorus Loads for Optimization <br />Parameter Units NH4-N Dry <br />Season <br />NH4-N Year <br />Round <br />TN Dry <br />Season <br />TN Year <br />Round <br />TP Dry <br />Season <br />TP Year <br />Round <br />Current <br />Discharge1 <br />lb N or <br />P/d <br />1,340 1,340 1,340 1,340 122 122 <br />Discharge with <br />Opt. Strategy1 <br />lb N or <br />P/d <br />200 190 1,040 970 122 114 <br />Load Reduction2 lb N or <br />P/d <br />1,140 1,150 300 370 0 8 <br />Load Reduction2 % 85% 86% 23% 28% 0% 7% <br />Annual Load <br />Reduction <br />lb N or <br />P/yr <br />416,000 420,000 110,000 134,000 0 2,900 <br />1. The loads represent average projected loads discharged to the Bay for the period of analysis (10-yr for optimization). <br />2. As compared to Current Discharge (Note 1). <br />3. The average annual load reduction over the 10-year project duration. The calculation considers days with no discharge. <br /> <br /> <br />