Wastewater Math Review Questions Trickling Filters Distance Learning Math Index Websites for Those Who Need Help Homepage Wastewater Treatment Math     Concentration (milligrams/liter or parts/million) to quantity (pounds or kilograms) *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: Concentration  (milligrams/liter or parts/million) to quantity (pounds or kilograms)/Day *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?   Quantity (Pounds or Kilograms) to Concentration (milligrams/liter or parts/million) 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?     Quantity (Pounds or Kilograms)/Day to Concentration (milligrams/liter or parts/million) 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.     Volume in Cubic Feet to Volume in Gallons: Volume in Gallons = Volume in Cubic Feet  x  7.5 Gallons/Cubic Feet How many gallons of sludge can be pumped to a digester which 3,240 cubic feet of volume available?   Volume in Gallons to Volume in Cubic Feet: How many cubic feet of sludge are removed when 15,500 gallons are withdrawn from a digester? Gallons to Pounds: If 1,235 gallons of solids are removed from the primary settling tank, how many pounds of solids are removed?   Pounds to Gallons: 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: