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I Design Criteri-F 40, rencor <br /> Appendix B. Basic Equations <br /> Converting Waste Constituent Concentrations and Flow to Mass <br /> To convert constituent concentrations of the primary treated effluent(PTE, mg/L)and flow(gallons, imperial gallons, liters,or cubic meters)to <br /> mass/day(lbs/day or kg/day), use the following equation: <br /> Equation B1 <br /> Load = PTE Value(mg/L)x Conversion Factor x Flow(Q) <br /> A)Using flow in gallons to calculate pounds/day: <br /> 1 lb 3.785 L lbs•L <br /> Conversion Factor,CFG = 453,592 mg x 1 gal — 8.34 X 10-6 Mg.gal <br /> g•gal <br /> B)Using flow in imperial gallons to calculate pounds/day: <br /> 1 lb 4.546 L lbs•L <br /> Conversion Factor,CFIG = 453,592 mg x 1 gal = 1.002 X 10-5 mg•gal <br /> C) Using flow in liters to calculate kilograms/day: <br /> 1 kg 1 L kg <br /> Conversion Factor,CFL = 1,000,000 mg x TTL = 1 X 10_6 mg <br /> D) Using flow in cubic meters to calculate kilograms/day: <br /> 1 kg 1000 L kg•L <br /> Conversion Factor,CF x = 0.001 <br /> cM — 1,000,000 mg 1 m3 mg•m3 <br /> Example 1 <br /> PTE value of 150 mg/L BOD5; Flow of 1000 gallons per day <br /> Determine BOD5 mass load in pounds per day using Equation 131 A: <br /> BODS Mass Load = (150 mg/L)x(8.34 x 10-6 lbs•L/mg•gal)x 1000 gpd = 1.25 lbs/d <br /> Example 2 <br /> PTE value of 150 mg/L BODS; Flow of 5 cubic meters per day <br /> Determine BODS mass load in kilograms per day using Equation 131 D: <br /> BODS Mass Load = (150 mg/L)x(0.001 kg•L/mg•m3)x 5 m3/d = 0.75 kg/d <br /> Performing a Mass Balance Calculation for a Blended Waste Stream <br /> Some applications are configured so that the waste stream to the treatment plant is made up from several contributing sources with varying flows <br /> and constituent concentrations.To determine the waste strength of a blended waste stream,a mass balance calculation must be performed. <br /> The easiest way to perform the mass balance calculation is to prepare a table listing each source,the flow contribution from the source,and the <br /> constituent concentrations being treated. <br /> • List contributing sources,anticipated flows and corresponding waste strengths <br /> • Waste strengths are provided after primary tankage and are listed as primary-treated effluent(PTE) <br /> Orenco Systems°•800-348-9843•+1 541-459-4449•www.orenco.com NDA-ATX-1 <br /> Rev.8,©10/20 <br /> Page 23 of 38 <br />