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SUMMIT ExvGINEERING, INC. <br /> Consulting Civil Engineers <br /> July 23, 2001 <br /> Project No. 2001015 <br /> Page 8.10 <br /> AERATION REQUIREMENTS <br /> Sizing parameters for the aerators are as follows: <br /> • BOD Loading = 5,000 mg/I <br /> • Average Day Harvest Flow = 136,500 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 /> Aerated Pond No. 1 <br /> r <br /> I BODS Mass Loading: <br /> Average Day Harvest Flow = 136,500 gpd <br /> BODS Concentration = 5,000 mg/1 <br /> BODS (Mass) = (5,000 mg/1)(0.1365 MGD)(8.345 lbs/MG) <br /> S = 5,695 lbs/day <br /> Use 5,700 lbs/dav <br /> Oxygen Requirements: <br /> 1.5 lbs 02/lbs; BOD )(5,700 lbs BODSLM <br /> (24 hrs/d) <br /> = 356 lbs O�hC <br /> Aerator Horsepower Required: <br /> i = 356 lbs 02/hr <br /> 2.2 lbs OZ/HP-hr <br />' = 162 HP <br /> Say 180 HP minimum <br /> Check Power-to-Volume Ratio: <br /> The volume of Pond No. 1 is approximately 4.36 Mgal with a freeboard of 2 ft. <br /> P\V = 180 HP x 7.48gal x 103 = 0.31 HP//..000 cf <br /> I 4,357,000 gal cf 1,000 cf <br /> P\V of 0.31 HP/1,000 cf is close to the acceptable range of 0.10 —0.20. Therefore, oxygen <br /> transfer and mixing is likely to occur in the upper 3-4 feet of the pond as required in a facultative <br /> aerated lagoon system. <br /> i <br /> I <br /> 1 <br />