Ohio EPA Formula/Conversion Table For Wastewater Treatment & Collection .

Approved Exam ProviderOhio EPA Formula/Conversion Table forWastewater Treatment & Collection ExamsAlkalinity, as mg CaCO3/L Amps (Titrant Volume, mL) (Acid Normality) (50,000)Sample Volume, mLVoltsOhms*Area of Circle (.785) (Diameter2) (π) (Radius2)Area of Cone (lateral area) (π) (Radius) Radius 2 Height 2Area of Cone (total surface area) (π) (Radius) (Radius Radius 2 Height 2 )Area of Cylinder (total exterior surface area) [Surface Area of End #1] [Surface Area of End #2] [(π) (Diameter) (Height or Depth)]*Area of Rectangle (Length) (Width)*Area of a Right Triangle Average (arithmetic mean) (Base) (Height)2Sum of All TermsNumber of TermsAverage (geometric mean) [(X1) (X2) (X3) (X4) (Xn)] 1/nBiochemical Oxygen Demand (unseeded), mg/L [(Initial DO, mg/L) - (Final DO, mg/L)][300mL]Desired FlowChemical Feed Pump Setting, % Stroke The nth root of the product of n numbersMaximum FlowSample Volume, mL 100%(Flow, MGD) (Dose, mg/L) (3.785 L/gal) (1,000,000 gal/MG)(Liquid, mg/mL) (24 hr/day) (60 min/hr)Chemical Feed Pump Setting, mL/min Circumference of Circle (π) (Diameter) 2 (π) (Radius)Composite Sample Single Portion Cycle Time, min (Instantaneous Flow) (Total Sample Volume)(Number of Portions) (Average Flow)Storage Volume, galPump Capacity, gpm - Wet Well Inflow, gpm*Pie Wheel format for this equationis available at the end of this document.Copyright 2013 byAssociation of Boards of CertificationWastewater Treatment and CollectionFormula/Conversion Table

Degrees Celsius (Degrees Fahrenheit - 32) (5/9) ( F 32 )1.8Degrees Fahrenheit (Degrees Celsius) (9/5) 32 (Degrees Celsius) (1.8) 32Detention Time VolumeFlowUnits must be compatibleDose Demand Residual*Electromotive Force (EMF), volts (Current, amps) (Resistance, ohms)*Feed Rate, lbs/day E IRor(Dosage, mg/L) (Capacity, MGD) (8.34 lbs/gal)Purity, % expressed as a decimalFilter Backwash Rise Rate, in/min (Backwash Rate, gpm/ft 2 ) (12 in/ft)7.48 gal/ft 3Filter Flow Rate or Backwash Rate, gpm/ft2 Filter Yield, lbs/hr/ft2 Flow, gpmFilter Area, ft 2(Solids Loading, lbs/day) (Recovery, % expressed as a decimal)(Filter Operation, hr/day) (Area, ft 2 )*Flow Rate, cfs (Area, ft2) (Velocity, ft/sec) orQ AVUnits must be compatibleBOD 5 , lbs/dayMLVSS, lbsFood/Microorganism Ratio *Force, lbs (Pressure, psi) (Area, in2)Gallons/Capita/Day Volume of Water Produced, gpdPopulation(Titrant Volume, mL) (1,000)Sample Volume, mLHardness, as mg CaCO3/L Horsepower, Brake (bhp) Only when the titration factor is 1.00 of EDTA(Flow, gpm) (Head, ft)(3,960) (Pump Efficiency, % expressed as a decimal)Horsepower, Motor (mhp) (Flow, gpm) (Head, ft)(3,960) (Pump Efficiency, % expressed as a decimal) (Motor Efficiency, % expressed as a decimal)*Horsepower, Water (whp) (Flow, gpm) (Head, ft)3,960Hydraulic Loading Rate, gpd/ft2 *Pie Wheel format for this equationis available at the end of this document.Total Flow Applied, gpdArea, ft 2Copyright 2013 byAssociation of Boards of CertificationWastewater Treatment and CollectionFormula/Conversion Table

Volume, gallonsLeakage, gpd Time, days*Mass, lbs (Volume, MG) (Concentration, mg/L)(8.34 lbs/gal)*Mass Flux, lbs/day (Flow, MGD) (Concentration, mg/L) (8.34 lbs/gal)Mean Cell Residence Time (MCRT) or Solids Retention Time (SRT), days Aeration Tank TSS, lbs Clarifier TSS, lbsTSS Wasted, lbs/day Effluent TSS, lb/dayMilliequivalent (mL) (Normality)Molarity Moles of SoluteLiters of SolutionMotor Efficiency, % Normality Brake hp 100 %Motor hpNumber of Equivalent Weights of SoluteLiters of SolutionNumber of Equivalent Weights Number of Moles Total WeightEquivalent WeightTotal WeightMolecular WeightOrganic Loading Rate, lbs BOD5/day/ft3 Organic Load, lbs BOD 5 /dayVolume, ft 3Organic Loading Rate-RBC, lbs BOD5/day/1,000 ft2 Organic Load, lbs BOD 5 /daySurface Area of Media, 1,000 ft 2Organic Loading Rate-Trickling Filter, lbs BOD5/day/1,000 ft3 Organic Load, lbs BOD 5 /dayVolume, 1,000 ft 3Oxygen Uptake Rate or Oxygen Consumption Rate, mg/L/min Oxygen Usage, mg/LTime, minPopulation Equivalent, Organic (Flow, MGD) (BOD, mg/L) (8.34 lbs/gal)BOD/day/person, lbsRecirculation Ratio-Trickling Filter Recirculated FlowPrimary Effluent Flow Original Flow - Reduced Flow 100%Original Flow Reduction in Flow, % In Out 100% In (In Out ) Reduction of Volatile Solids, % All information (In and Out) must be in decimal form In Out 100% In Removal, % *Pie Wheel format for this equationis available at the end of this document.Copyright 2013 byAssociation of Boards of CertificationWastewater Treatment and CollectionFormula/Conversion Table

Return Rate, % Return Flow Rate 100%Influent Flow Rate(MLSS) (Flow Rate)Return Activated Sludge Suspended Solids MLSSReturn Sludge Rate-Solids Balance Slope, % Drop or RiseDistanceSludge Density Index 100%100SVISludge Volume Index (SVI), mL/g Solids, mg/L (SSV30 , mL/L) (1,000 mg/g)MLSS, mg/L(Dry Solids, grams) (1,000,000)Sample Volume, mLSolids Concentration, mg/L Weight, mgVolume, LSolids Loading Rate, lbs/day/ft2 Solids Applied, lbs/daySurface Area, ft 2Solids Retention Time (SRT): see Mean Cell Residence Time (MCRT)Specific Gravity Specific Weight of Substance, lbs/galSpecific Weight of Water, lbs/galSpecific Oxygen Uptake Rate or Respiration Rate, (mg/g)/hr Surface Loading Rate or Surface Overflow Rate, gpd/ft2 Velocity, ft/sec Flow Rate, ft 3 / secArea, ft 2orMLVSS, g/L (1 hr)Flow, gpdArea, ft 2Three Normal Equation (N1 x V1) (N2 x V2) (N3 x V3)Two Normal Equation N1 x V1 N2 x V2OUR, mg/L/min (60 min)Where V1 V2 V3Where N normality, V volume or flowDistance, ftTime, sec Dry Solids, g Fixed Solids, g 100%Dry Solids, g Volatile Solids, % *Volume of Cone (1/3) (.785) (Diameter2) (Height) (1/3) [(π) (Radius2) (Height)]*Volume of Cylinder (.785) (Diameter2) (Height) (π) (Radius2) (Height)*Volume of Rectangular Tank (Length) (Width) (Height)Watts (AC circuit) (Volts) (Amps) (Power Factor)*Pie Wheel format for this equationis available at the end of this document.Copyright 2013 byAssociation of Boards of CertificationWastewater Treatment and CollectionFormula/Conversion Table

Watts (DC circuit) (Volts) (Amps)Weir Overflow Rate, gpd/ft Flow, gpdWeir Length, ftWire-to-Water Efficiency, % Water Horsepower, hp 100%Power Input, hp or Motor hpWire-to-Water Efficiency, % (Flow, gpm) (Total Dynamic Head, ft) (0.746 kW/hp) 100%(3,960) (Electrical Demand, kW)Abbreviations:BODbiochemical oxygen demandCBODcarbonaceous biochemicaloxygen demandcfscubic feet per secondCODchemical oxygen demandDOdissolved oxygenftfeetF/M ratio food to microorganism ratioggramsgpdgallons per daygpggrains per gallongpmgallons per smg/Lmilligrams per literMCRTmean cell residence timeMGDmillion gallons per dayminminutemLmilliliterMLSSmixed liquor suspended solidsMLVSS mixed liquor volatilesuspended solidOCRoxygen consumption rateORPoxidation reduction potentialOURoxygen uptake rateppbparts per billionppmparts per millionpsipounds per square inchPEpopulation equivalentQflow*Pie Wheel format for this equationis available at the end of this document.Abbreviations(continued):RASreturn activated sludgeRBCrotating biological contactorSDIsludge density indexSRTsolids retention timeSSsettleable solidssettled sludge volume 30 minuteSSV30SVIsludge volume indexTOCtotal organic carbonTStotal solidsTSStotal suspended solidsVSvolatile solidsWASwaste activated sludgeConversion Factors:1 acre 43,560 square feet1 acre foot 326,000 gallons1 cubic foot 7.48 gallons 62.4 pounds1 cubic foot per second 0.646 MGD1 foot 0.305 meters1 foot of water 0.433 psi1 gallon 3.79 liters 8.34 pounds1 grain per gallon 17.1 mg/L1 horsepower 0.746 kW 746 watts 33,000 foot lbs/min1 mile 5,280 feet1 million gallons per day 694 gallons per minute 1.55 cubic feet per second (cfs)1 pound 0.454 kilograms1 pound per square inch 2.31 feet of water1 ton 2,000 pounds1% 10,000 mg/Lπ or pi 3.14159Copyright 2013 byAssociation of Boards of CertificationWastewater Treatment and CollectionFormula/Conversion Table

Area of Circle*Pie Wheels: To find the quantity above the horizontal line: multiply thepie wedges below the line together.AreaCircle To solve for one of the pie wedges below the horizontal line:cover that pie wedge, then divide the remaining pie wedge(s)into the quantity above the horizontal line.Given units must match the units shown in the pie wheel.0.785D2Area of RectangleArea of Right TriangleElectromotive Force (EMF), voltsAreaRectangleAreaRight entOhmsResistanceFeed Rate, lbs/dayFlow Rate, cfsForce, poundslbs/dayChemical Feed100% PuritycfsFlow /secVelocitypsiPressurein2AreaHorsepower, Water (whp)Mass, lbsMass Flux, lbs/daywhpHorsepowerlbsMasslbs/dayMass s/galMGDFlowmg/LConc.8.34lbs/galVolume of ConeVolume of CylinderVolume of Rectangular 3D2H0.785HeightD2Copyright 2013 byAssociation of Boards of CertificationLengthHeightWidthWastewater Treatment & CollectionFormula/Conversion Table

SDI sludge density index . SRT solids retention time . SS settleable solids . SSV. 30. settled sludge volume 30 minute . SVI sludge volume index . TOC total organic carbon . TS total solids . TSS total suspended solids . VS volatile solids . WAS waste activated sludge . Conversion Factors: 1 acre 43,560 square feet . 1 acre foot 326,000 .