Αποτελέσματα Αναζήτησης
WASTEWATER OPERATOR’S FORMULA SHEET 2022 1 CONVERSION FACTORS π = Pi ≈ 3.14 1% = 10,000 mg/L 1 liter (L) = 1,000 milliliters (ml) & [1.0 ml water = 1.0 gm] ... COMMONLY USED FORMULAS [pounds formula] Daily Loading, (lbs/day) = (Concentration, mg/L)(Flow, MGD)(8.34, lbs/gal) Percent (%) Removal = [(in−out) in]100
SUMMARY OF KEY WASTEWATER MATH FORMULAS - Continued Rectangular Horizontal-Flow Grit Chambers: IMPORTANT CONVERSIONS: 1.55 CFS/MGD 448.8 gpm / CFS 2. 1.0 FPS = 3.0 sq. ft. of area for every 3.0 cfs of flow. 3. Velocity = At 1.25 fps, or greater, bottom scour begins to occur. 4. Flow Conversions: Flow, GPM = ( Q, cfs ) X ( 448.8 GPM/cfs )
Depending on your required math solutions pertaining to pounds — for operational purposes or certification exam preparation — calculations and unit of expression require explicit formulas. Common formulas for Poundage (Lbs.) calculations are described below:
1 gallon = 8.34 pounds 1 grain per gallon = 17.1 mg/L 1 horsepower = 0.746 kW or 746 watts or 33,000 ft. lbs./min. 1 million gallons per day = 694 gallons per minute 1 million gallons per day = 1.55 cubic feet per second 1 mile = 5,280 feet 1 pound = 0.454 kilograms 1 pound per square inch = 2.31 feet of water 1 ton = 2,000 pounds 1% = 10,000 mg/L
Operators obtaining or maintaining their certification must be able to calculate complex formulas and conversion factors. This Tech Brief provides basic examples of these formulas and conversion
*Pie Wheel format for this equation Copyright © 2013 by Wastewater Treatment, Industrial, Collection, is available at the end of this document. Association of Boards of Certification & Laboratory Formula/Conversion Table Watts (AC circuit) = (Volts) (Amps) (Power Factor) Watts (DC circuit) = (Volts) (Amps) Weir Overflow Rate, gpd/ft =
1 Σεπ 2015 · 1 pounds per square inch (psi) = 2.31 ft of water 1 horsepower (HP) = 746 watts = 0.746 kW F/M = food to microorganism ratio VS = volatile solids MLVSS = mixed liquor volatile suspended solids MCRT = mean cell residence time RSF = return sludge flow SG = specific gravity TDH = total dynamic head F/M = lbs BOD entering aeration basin per day
