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5 <br /> 4 <br /> 712 CHAPTER 11: Intermittent and Recirculating Packed-Bed Filters - <br /> 5. Effluent BOD = 5 mg/L <br /> 6. Influent TSS = 30 mg/L <br /> 7. Effluent TSS = 5 mg/L <br /> 8. Influent VSS = .80% <br /> 9. Influent oil and grease = 15 mg/L <br /> 10. Effluent oil and grease = 3 mg/L <br /> 11. Assume 60%of oil and grease is biodegraded <br /> I2. Portion of influent TSS associated with influent BOD = 80% <br /> 13. Net biological yield = 0.2 mg cells/mg BOD converted (organisms in filter are <br /> assumed to be in the maintenance phase) <br /> 14. Net biological yield = 0.3 mg cells/mg oil and grease converted ` <br /> 15. Specific-gravity of the accumulated solids = 1.125 <br /> Solution <br /> 1. Determine the mass of TSS applied to the filter,for a unit surface area of 1.0 m2: <br /> MTss = (30 mg/L)(40 L/m2•d)(1.0 mz)(365 d/yr)(1/1000 mg/g) <br /> = 438 glyr <br /> 2. Determine the mass of influent TSS remaining after degradation: <br /> Min = (438 g/yr)(I -- 0.8) = 87.6 g <br /> 3. Determine the mass of biological solids produced from the BOD: <br /> Mbio = (130 mg/L -" 5 mg/L)(0.2)(40 Urn'-d)(LO m2)(365 d/yr)(1 g/1000 mg) <br /> = 365.0 g/yr <br /> 4. Determine the mass of TSS in the effluent: <br /> M.f = (5 mg/L)(40 Lim'-d)(1.0 m2)(365 d/yr)(1 g/l000 mg). <br /> = 73.0 g/yr <br /> 5. Determine the mass of oil and grease applied to the filter: <br /> Mo&c = (15 mg/L)(40 L/m2•d)(LO m2)(365 d/yr)(1 g/1000 mg) <br /> = 219.0 g/yr <br /> 6. Determine the mass of biological solids produced from the oil and grease(O&G): <br /> Mb[oto&ca = (219 g/yr)(0.6)(03) - <br /> = 39.4 g/yr <br /> 7. Determine the mass of oil and grease remaining after degradation: <br /> Mdeg = (219.0 g/yr)(1 - 0.6) <br /> = 87.6 g/yr <br /> 8. Determine the mass of oil and grease in the effluent: <br /> Memo&G) _ Q mg/L)(40 LIm2•d)(1.0 m2)(365 d/yr)(1 g/1000 mg) <br /> 43.8 g/yr <br /> 9. Determine the mass of solids accumulated in the filter: <br /> Accumulation = inflow(remaining after degradation) - outflow + generation <br /> 87.6 g/yr(TSS) + 87.6 g/L(O&G) - 73.0 g/yr(TSS) <br /> - 43.8 �Yr(O&G) + 365 �Yr(biological solids from BOD) <br /> + 39.4 g/yr(biological solids from O&G) <br /> = 462.8 g/yr <br />