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Wastewater Formula Examples

 Formula Math Toolbox Example Mass Load (kg/day) = Flow {MGD} x Concentration {mg/L} x 3.785 V6 * V46 * 8.34 Where: V6 is flow in MGD, V46 is concentration in mg/L V452 / V450 * 1000 Where: V452 is 30 min settleometer, V450 is MLSS V102/V460 Where: V102 is BOD primary effluent lbs, V460 is MLSS lbs V460 / V101 Where: V460 is MLSS lbs, V101 is TSS lbs in primary effluent V460 / ( (V350 * V351 * 8.34) + (V131 * V101 * 8.34)) Where: V460=MLSS lbs, V350= WAS Flow (MGD), V351 = RAS/WAS SS {mg/L} V131= Eff TSS {mg/L}, V101=Effluent Flow {MGD} Note: Typically SRT does not include the Solids in the Secondary Clarifiers Method #1 (V460+V413) / (V399+V132) Where: V460=MLSS lbs, V413=secondary clarifier lbs, V399=WAS lbs, V132=effluent TSS lbs Method #2 (V461*2.5*8.34) / (( V350*V352*8.34) + (V132*V101*8.34) Where: V461 = MLVSS,  2.5 Vol of Aeration in MG, V350 = WAS Flow (MGD), V352 RAS/WAS VSS (mg/L)V132 = Eff VSS (mg/L),  V101 = Eff Flow (MGD) V399/(V102-V131) Where: V399=WAS lbs, V102= BOD primary effluent lbs, V131= BOD effluent lbs (V50*8.34*V2)/0.167 Where: V50=Influent BOD, V2=Influent flow 1.8 * V92 + 32 Where: V92 is Influent Water Temperature {C} (V91 -32) / 1.8 Where: V91 is Influent Water Temperature {F} V2 * 0.00144 Where: V2 is Flow {GPM} (1.23*7.48*24) / V7 Where: 1.23 is Tank Volume in Cu Ft7.48 is gal/Cu Ft24 is hours in dayV7 is Flow in gals/day (V1021*1.23*8.34) - (V11 * V1 * 8.34) / V1071 Where: V1021 = MLSS1.23 = Aeration Volume8.34 = lbs/galV11 = Inf BODV1 = Inf FlowV1071 = Target F:M See calculating percent removal for more information on percent removal calculations. (V11 - V4011) / V11 * 100 Where: V11=Inf BOD V4011=Eff BOD Solids Loading Rate in lbs/sqft = MLSS{mg/L} X (Inf Flow{MGD} + RAS FLow{MGD}) X 8.34{lbs/gal} / Clarifier Surface are in Sq Ft (V1021 (V1+V1001)8.34) / V4065 Where: V1021 = MLSSV1 = Inf FlowV1001=Ras Flow8.34 = lbs/galV4065 = Clarifier Surface area in Sqft V14 / 890 V14 = Flow in gpd890 = Surface area in SqFt Chlorine Demand in mg/L = Chlorine Dose{mg/L} - Chlorine Residual{mg/L} V4062 - V4063 Where: V4062 = Chlorine DoseV4063 = Chlorine Residual Horizontal Tank Volume (with flat ends) in gallons ((44^2 * ((ARCCOS((44-V206)/44))*(3.14159/180))-(44-V206) *(2*44*V206-V206^2)^0.5)*177)*7.4805/1728 Where:44 is tank radius (inches)177 is tank length (inches)V206 is depth of liquid (inches) Lab:  Seeded BOD {mg/L} = (Initial DO{mg/L} - Final Do{mg/L}) - (Initial Seed Control DO{mg/L} - Final Seed Control DO{mg/L}) X Volume of Seed Added{mg/L} / Sample Volume {mL/bottle volume mL} * Volume of Seed added is Seed Material that has been added directly to sample or to seed control bottles (V4013-V4014)-(V4023-V4024) * 2 / 300 Where: V4013= Eff BOD Initial DOV4014= Eff BOD Final DOV4023=Seed Control Sample Intial DOV4024=Seed Control Sample Final DO2= Volume of Seed added300 = mL / bottle Lab:  Suspended Solids in {SS} mg/L = Weight of Filtered dry Solids{mg} - Weight of the filter{mg} / Sample volume{ml}X 1000000   * See Custom Data Entry TSS Bench Sheet 1.08752 - 1.06619 / 100 * 1000000 Where: 1.08752 = Weight of Filter Dry and Tara Weight1.06619 = Tara weight100 = amount of Sample in mililiters1000000 = Liters Lab: Volatile Suspended Solids {VSS} mg/L = Weight of filter and Dry Solids{mg} -  Weight of Filter and Ash{mg} / Sample volume {ml} * 1000000 1.08750 - 1.0687 / 100 *1000000 Where: 1.08750 = Weight of Filter Dry and Dry Solids1.0687 = Weight of Filter and Ash100 = amount of Sample in mililiters1000000 = Liters Langelier Saturation Index = pH - pHs where pHs = (9.3 + A + B) - (C + D) Where: A = (Log 10 [TDS] - 1) / 10 B = -13.12 x Log10 (oC + 273) + 34.55  C = Log10 [Ca2+ as CaCO3] - 0.4  D = Log10 [alkalinity as CaCO3] V101 = LSI(V102,V103,V104,V105,V106) Where:  V102: is the measured water pH V103: is the TDS V104: is the Temperature in Deg C V105: is the Hardness in mg/L Related Articles No Related Articles Available.

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