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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:
Wastewater Math Solution Templates available for your specific Requirements. Watch this video to see how valuable these Wastewater Math Solution Templates will be for you. Wastewater Dan presents an accurate Tool for Wastewater Math Calculated Solutions with Excel Spreadsheets.
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
A Guide to using the ABC/EOCP Canadian Standardized Formula Handouts for Wastewater Treatment, Wastewater Collection, Water Treatment, Water Distribution and Laboratory Exams With solved examples of every formula in both US and Metric units
