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D. FACULTATIVE POND SIZING <br /> Treatment pond conditions are based upon slaughterhouse effluent analysis (See Appendix). This <br /> effluent sample was taken from a slaughterhouse which has no blood recovery and only gross solids <br /> removal. Referenced changes pertain to proposed Stagno facility: <br /> _ 1. Influent suspended solids=200 mg/1. Should be reduced by 20%with installation of a grease <br /> trap = 160 mg/l. <br /> 2. Influent BODS = 1100 mg/l. Should be reduced 50% by capturing 99% of all blood, screening <br /> of solids and grease trap = 550 mg/1. <br /> 3. Summer liquid temp =27° C (80°F) <br /> 4. Winter liquid temp = 13° C (55°F) <br /> 5. Overall fust-order BODS removal rate constant=0.25/day @ 20° C <br /> 6. Temperature Coefficient= 1.056 <br /> 7. Pond liquid depth= 6 t- Pond overall depth=8 ft(one foot freeboard, one foot anaerobic layer) <br /> 8. Pond dispersion factor= 0.5 <br /> 9. Overall BODS removal efficiency= 80% <br /> SIZING AND SURFACE LOADING <br /> IA. A value for kt of 2.4 has been determined based on a dispersion factor (d) of 0.5 and a BODS <br /> removal of 80% (20% S/So remaining). <br /> 2B. Temp coefficient for winter and summer conditions: <br /> Winter: k13= (0.25/day)(1.056)131 = 0.166/day <br /> Summer: k27=(0.25/day)(1.056)271= 0.397/day <br /> _ 3C. Detention time for winter and summer: <br /> Winter: (0.166/day)(t)=2.4 t= 14.5 days <br /> Summer: (0.397/day(t) =2.4 t= 6.1 days <br /> 4D. Pond volume and surface requirement: <br /> Winter: Volume=30,000 gal/d(safety factor of 2 applied)(14.5 days)(1 ft3/7.48 gal) <br /> = 58,155 ft <br /> Surface area= (58,155 ft3/6 ft)(1 ac/43,560 ft2) = 0.25 acres <br /> 4 <br /> Valfey Ag Pssearck <br />