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A surface water treatment plant treats a 6,000 L/day flow with alum coagulation, identified by the...

A surface water treatment plant treats a 6,000 L/day flow with alum coagulation, identified by the following stoichiometric reaction:

Al2(SO4)3 ∙ 14 H2O + 6HCO3- ↔ 2Al(OH)3 (s) + 6 CO2 + 14 H2O + 3 SO42-

Molecular weights (g/mol):

Al2(SO4)3 ∙ 14 H2O  =   594.5

HCO3-  =  61

Al(OH)3  =  78

SO42-  =  96.1

Jar tests indicate that 55 mg/L of alum are required to optimally treat the surface water. Removal of approximately 20.2 mg/L of suspended solids also occurs in this sytem. Estimate the mass of sludge disposed of daily (g/day).

Engineering   Civil-Engineering   
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Ans. 86.59 g/L ( total sludge generated per day)

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