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Wastewater Treatment Math

 
 
  1. Concentration (milligrams/liter or parts/million) to quantity (pounds or kilograms)


    2. *Concentration to Pounds:

    The solids concentration in the aeration tank is 2580 mg/L.  The tank volume is 0.90 MG.  How many pounds of solids are in the tank?



     
     

    *Concentration to Kilograms:

  2. Concentration  (milligrams/liter or parts/million) to quantity (pounds or kilograms)/Day


    3. *Concentration to Pounds/Day:


    How many pounds of solids are discharged per day when the plant effluent flow rate is 4.85 MGD and the effluent solids concentration is 23 mg/L?


     
     

    *Concentration to Kilograms/Day:




    The effluent contains 27 mg/L of BOD5.  How many kilograms per day of BOD5 are discharged when the effluent flow rate is 11.5 MGD?


     

  3. Quantity (Pounds or Kilograms) to Concentration (milligrams/liter or parts/million)

    4. The process control calculation indicates that the aeration tank should contain 12,168 pounds of suspended solids.  The tank has a volume of 0.61 MG.  What should the suspended solids concentration be in the aeration tank?


     


 

  1. Quantity (Pounds or Kilograms)/Day to Concentration (milligrams/liter or parts/million)


    2. The scales indicates that 190 pounds per day of chlorine are currently being used to treat a flow of 2.5 MGD.  What is the chlorine dose in milligrams per liter.


     


     

  2. Volume in Cubic Feet to Volume in Gallons: Volume in Gallons = Volume in Cubic Feet  x  7.5 Gallons/Cubic Feet


    3. How many gallons of sludge can be pumped to a digester which 3,240 cubic feet of volume available?


     

  3. Volume in Gallons to Volume in Cubic Feet:


    4. How many cubic feet of sludge are removed when 15,500 gallons are withdrawn from a digester?

  4. Gallons to Pounds:


    5. If 1,235 gallons of solids are removed from the primary settling tank, how many pounds of solids are removed?


     

  5. Pounds to Gallons:


    6. How many gallons of water are required to fill a tank which holds 6,458 pounds of water?

Wastewater Treatment Plant Performance, Percent Removal Or Efficiency:


Preliminary Treatment:
Grit Channel Velocity Using a Float:

 
 
Grit Channel Velocity Using Flow and Water Area:
      
Settling Tank:
Surface Settling Rate in Gallons/Square Foot/Day:


 
 

Weir Overflow Rate in Gallons/Foot/Day: