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3) Equalization Zone <br />(a) Detention based on 1 hour at Peak Hourly Flow <br />(72,000/24) = 3,000 alg lops <br />Design at minimum of 3,000 gallons use duplex pumps and flow regulating -box to allow <br />no more than 1.250 to aeration zone with one pump running and 2.50 to aeration zone <br />with both pumps running. <br />Actual volume = 6,089 gallons <br />4) Sludge Holding Zone <br />(a) Volume based on 3 cu.ft. per Population Equivalent (100 gal/PE). <br />(18,000/100)(3)(7.481) = 4,039alg lons <br />Design at minimum of 4,039alg lons. <br />Actual volume = 4,200 gallons <br />5) Chlorination Zone <br />(a) Volume based on 15 minutes @ Peak Daily Flow <br />(27,000/1440)(15) = 281 gallons <br />Design at minimum of 281 gallons with calcium hypochlorite feed system. <br />Actual chlorination zone = 493 gallons <br />6) Plant Blower/Motor Units <br />(a) Aeration @ 2,050 cfd/# BODS <br />(2,050*34.5)/1440 = 50 cfin <br />(b) Sludge Holding @ 30 cfin/1,000 cu.ft. (4200/7.48 = 561 ft <br />(30)(561/1000) = 17 cfrn <br />(c) Airlifts @ 3 cfm/lift <br />(3.0)(3) = 9 cfm <br />(d) Total cfm = 50+17+9 = 76 cfm <br />Design at minimum of 76 cfin duplex blower motor units. <br />Actual volume = 78 cfm <br />13 <br />