A waste contains 100 mg/L acetic acid (CH 3 COOH) and 50 mg/L NH 3 -N. Determine

Question

1. A waste contains 100 mg/L acetic acid (CH3COOH) and 50 mg/L NH3-N. Determine the theoretical carbonaceous oxygen demand, the theoretical nitrogenous oxygen demand, and the total theoretical oxygen demand of the waste.

Explanation / Answer

theoretical carbonaceous oxygen demand CH3COOH +2 O2...........> 2CO2 + 2H2O 2 moles of O 2 required 32 g/mole O2 is required theoretical nitrogenous oxygen demand 2 NH3 + 3O2 .........> 2HNO2 + 2H2O HNO2 + 1/2 O2 ..........> HNO3 3.5 mole of O2 is required for 2moles of NH3 for 1mole of NH3 1.75 moles of O2 is required 56 g/mole is required totally 88 g/mole is required for both

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