Extra Math

  1. If an effluent flow is 0.6 MGD and the chlorine dosage is 8 mg/L, how many pounds of chlorine are added daily?
  2. If a chlorine solution is 12.5% active chlorine and one gallon weighs 10 pounds, how many pounds of available chlorine are in a gallon?
  3. Given the following information, how many gallons of sodium hypochlorite will be fed in one day?
    • WWTP flow is 0.5 MGD
    • Sodium Hypochlorite is 12.5%
    • Desired dosage is 10 mg/L
    • Sodium Hypochlorite weighs 10 lbs/gal
  4. If a tank is 100’ x 40’ with a water depth of 8’ and the flow is 2.0 MGD, what is the detention time in hours?
  5. If a chemical has a density of 1.43 and is delivered in a 55 gallon drum, what is the total weight of the container if an empty drum weighs 45 pounds?
  6. What is the BOD of a sample if the initial D.O. was 5.3, the end D.O. was 2.2, and 20 mls. of sample was used?
  7. If a dry filter weighed 0.1875 grams and that same filtered weighed 0.3452 grams with the dry solids, what is the concentration of suspended solids if the sample was 100 mls?
  8. In a wet well that is 15’ x 15’, if the “lead pump off” float is 4’ above the floor, how many gallons are in the well when the pump turns off?