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J <br /> D. FACULTATIVE POND SIZING <br /> Treatment pond conditions are based upon slaughterhouse effluent analysis (See Appendix)- This <br /> solids <br /> effluent sample was taken from a slaughterhouse which has no blood recovery and only gross <br /> removal. Referenced changes pertain to proposed Stagno facility: <br /> 1. Influent suspended solids = 200 mg/l. Should be reduced by 20%with installation of a grease <br /> trap = 160 mg/l. <br /> 2. Influent BODS = I 100 mg/l. Should be reduced 50%by capturing 99% of all blood, screening <br /> of solids and grease trap = 550 mg/l. <br /> 3. Summer liquid temp= 27° C (80°F) <br /> 4. Winter liquid temp= 13° C (55°F) <br /> 5. Overall first-order BODS removal rate constant= 0.25/day @ 20° C <br /> 6. Temperature coefficient= 1.056 <br /> 7. Pond liquid depth= 6 ft; 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 summerconditions: <br /> Winter: k„_ (0.25/day)(1.056) y <br /> Summer: kZ, =(0.25/day)(1.056)"'= 0.397/day <br /> 3C. Detention time for winter and ssummer:4.5 days <br /> Winter: (0.166/day)(t) _ <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 fen.48 gal) <br /> = 58,155 ft' <br /> Surface area= (58,155 f-0/6 ft)(1 ac/43,560 ff)=0.25 acres <br /> -44- Vafley Ag R€Searck <br />