* The bottom of this formula is talking about what is currently UNDER aeration (what is already in my aeration basin). 8.34 is always there – it is my conversion, it is a constant. The FLOW is what is coming into the plant or or from the primary clarifier and will be presented as MGD. So the FOOD is the TSS or SS leaving the primary clarifier or found in the plant influent and that number will be represented in mg/L (again, a number supplied by laboratory results). * The top of this formula is talking about the FOOD available to the microorganisms and that food is going TO the aeration tank. I know that when I talk about finding pounds it is using the formula I just learned (Flow, MGD X Conc, mg/L X 8.34 lbs/gal) What tells me it is two loading formulas on top of each other is the LBS portion of the formula. Such as:į/M = (lbs BOD/day to aeration tank) / (lbs of MLVSS under aeration) you will see that the formulas are made up of a pounds formula (also called Loading Formula) divided by a pounds formula. How many pounds of alum are used each day?įlow, MGD X Conc, mg/L X 8.34 lbs/gal = lbs/dayĢ.5 MGD X 26 mg/L X 8.34 lbs/gal = 542 lbs/dayĪs you look at your formulas for F/M ratio, Sludge Age, etc. A water plant feeds alum at a dosage of 26 mg/L. PPM is an abbreviation for Parts per Million and that is the same as mg/L or (milligrams per liter).ġ. = Concentration in mg/L or Concentration in ppm or Dosage in mg/L or ppm (these are the numbers usually supplied by laboratory analysis). The Flow or Volume must be presented in Million Gallons, so you may have to convert from Gallons to Million Gallons to do the work properly.Ĭonc. MG = Flow in Millions of Gallons per Day or Volume in Million Gallons The basic formula looks like this: Lbs = Flow, MGD X Conc, mg/L X 8.34 lbs/gal The formula assumes that all of the material found in wastewater weighs the same as water, 8.34 pounds per gallon. the formula can also be used to determine the amount of mixed liquor in the aeration basin and the amount of sludge to be disposed of in the landfill. This formula is used to determine the loading on the plant and its various process untis the loading on the receiving water the amount of chemical needed for a specific function. One of the most common formulas used by water and wastewater operators is the pounds formula.
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