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Vantage Bay Property Development <br /> <br />Assumptions: <br /> Wastewater ADF at build-out is approximately 75,000 gpd <br /> Construction will occur over several years <br /> Average wastewater characteristics are BOD=300 mg/L & TSS=270 mg/L <br /> Effluent quality should reduce BOD & TSS to <5 mg/L and should target low TN & TP <br /> <br />Parameter Influent <br />Phase 1 <br />Influent <br />Phase 2 <br />Influent <br />Phase 3 Effluent <br />Flow (GPD) 25,000 50,000 75,000 --- <br />BOD (mg/L) 300 300 300 < 5 <br />TSS (mg/L) 270 270 270 < 5 <br />TKN (mg/L) 70 70 70 --- <br />NH3-N (mg/L) 47 47 47 < 1 <br />TN (mg/L) --- --- --- < 10 <br />TP (mg/L) 8 8 8 < 1 <br />Minimum Water <br />Temperature (Degrees F) 50 50 50 50 <br /> <br /> <br />Suggestions: <br /> <br />1. Construct the wastewater treatment system in three (3) phases of 25,000 gpd per phase. <br />2. Base the design around the use of Membrane Bio-reactor (MBR) technology in order to: <br />a. Minimize the physical footprint of the plant <br />b. Simplify the operation of the plant by eliminating the potentially problematic gravity <br />settling process in conventional activated sludge systems <br />c. Ensure 24/7 achievement of effluent with better than 5/5 quality levels, suitable for <br />non-potable reuse or discharge. <br />3. Construct the sewerage, lift stations and concrete process tankage for the full 75,000 gpd ADF <br />but only install the MBR systems in 25,000 gpd phases as demand grows. <br /> <br />Item Units Phase 1 Phase 2 Phase 3 <br />Total EQ Tank (8 hours) Gallons 8,350 16,700 25,050 <br />Total Pre-Anoxic Zone Volume Gallons 4,700 9,400 14,100 <br />Total Aerobic Zone Volume Gallons 9,000 18,000 27,000 <br />Total Post-Anoxic Zone Volume Gallons 3,200 6,400 9,600 <br />Total Membrane Tank Volume Gallons 4,800 9,600 14,400 <br /> <br /> <br /> <br />Index #6