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Alum is dosed at 20 mg/L in a coagulation treatment facility with a flow rate of 1 m3/s. There will be no further chemicals added. The suspended solids content in influent and effluent was measured is 40 and 10 mg/L, respectively. The sludge content is 1 %, and the specific gravity is 2.95. How much sludge must be disposed of each day?
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Alum is dosed at 20 mg/L in a coagulation treatment facility with a fl...
Calculation of Sludge Disposal in Coagulation Treatment Facility


Given Information:


  • Alum dosed = 20 mg/L

  • Flow rate = 1 m3/s

  • Influent suspended solids content = 40 mg/L

  • Effluent suspended solids content = 10 mg/L

  • Sludge content = 1%

  • Specific gravity of sludge = 2.95



Calculations:

The amount of suspended solids removed from the influent can be calculated using the following formula:

Suspended solids removed = influent suspended solids content - effluent suspended solids content

Suspended solids removed = 40 - 10 = 30 mg/L


The mass of alum added per second can be calculated using the following formula:

Mass of alum added per second = flow rate x alum dosed

Mass of alum added per second = 1 x 20 x 10^-3 = 0.02 kg/s


The mass of sludge produced per second can be calculated using the following formula:

Mass of sludge produced per second = suspended solids removed x flow rate / sludge content

Mass of sludge produced per second = 30 x 1 / 0.01 = 3000 kg/s


The mass of sludge produced per day can be calculated by multiplying the mass of sludge produced per second by the number of seconds in a day:

Mass of sludge produced per day = 3000 x 86400 = 259200000 kg/day


Conclusion:

The amount of sludge produced per day in the coagulation treatment facility is 259200000 kg/day.
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Alum is dosed at 20 mg/L in a coagulation treatment facility with a flow rate of 1 m3/s. There will be no further chemicals added. The suspended solids content in influent and effluent was measured is 40 and 10 mg/L, respectively. The sludge content is 1 %, and the specific gravity is 2.95. How much sludge must be disposed of each day?
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