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- SUMMIT ENGINEERING, INC. <br /> Consulting Civil Engineers <br /> July 23, 2001 <br /> Project No. 2001015 <br /> Page B.15 <br /> AERATION REQUIREMENTS <br /> Sizing parameters for the aerators are as follows: <br /> • BOD Loading = 5,000 mg/I <br /> • Average Day Harvest Flow = 262,000 gpd <br /> • Oxygen Requirement — 1.5 lbs 02/lb BOD <br /> • Oxygen Transfer Rate = 2.2 lbs Oz/HP - hr <br /> • Power/Vol Ratio, Pond No. 1 0.10 - 0.20 HP/1,000 cu ft <br /> • Power/Vol Ratio, Pond No. 2 = 0.05 - 0.10 HP/1,000 cu ft <br /> • Pond No. 1 Volume — 4.36 Mgal <br /> • Pond No. 2 Volume — 4.36 Mgal <br /> • Pond No. 3 Volume 8.02 Mgal <br /> Aerated Pond No. 1 and No. 2 <br /> BODS Mass Loading: <br /> Average Day Harvest Flow = 262,000 gpd <br /> BODS Concentration = 5,000 mg/I <br /> BODS (Mass) = (5,000 mg/1)(0.262 MGD)(8.345 lbs/MG) <br /> I = 10,932 lbs/day <br /> Use 11.000Ibs/dav <br />� Oxygen Requirements: <br /> a <br /> _ (1.5 lbs Oz/Ibs BOD )(11,000 lbs BOD5L <br /> (24 hrs/d) <br /> = 688 lbs Oz�hC <br /> Aerator Horsepower Required: <br /> = 688 lbs 0-)1h <br /> 2.2 lbs Oz/HP-hr <br /> = 313 HP <br /> Say 360 HP— 180 HP in each non <br />