19. (Mass balancing; Denitrification): For the denitrification microbiological c

Question

19. (Mass balancing; Denitrification): For the denitrification microbiological conversion of nitrite/nitrate to nitrogen gas) to be more effective, an external carbon source (e.g., methanol) is frequently added for denitrifiers during the reaction. The following chemical reaction is for when methanol is added for this purpose. Calculate how much (concentration) of methanol needs to be added to completely convert 30 mg/L of NO-N to N, gas 0.1667 CHO0.1343 NO 0.1343 H 0.0143 C H,O,N + 0.06 N, 0.3505 H,O 0.0952 CO,

Explanation / Answer

molecular mass of CH3OH = 12+3x1+16+1 = 32

molecular mass of NO3- = 14+3x16 = 62

mass of NO3- in one litre of solution = 30mg = 0.03g, so number of mole of NO3- per litre of solution = 0.03/62

now given chemical equation are balanced.

so, by unitary method

0.1343 mole of  NO3- requires 0.1667 mole of mehanol for 1L of solution

or, 1 mole of  NO3- will require 0.1667/0.1343 mole of methanol for 1L of solution

or, 0.03/62 mole of  NO3- will require (0.1667/0.1343)x(0.03/62) mole of methanol for 1L of solution

= 6.006x10-4 mole of methanol per litre of solution

so, mass of methanol required per litre = 6.004x10-4x32 = 0.019219g = 19.22mg

Concentraion of methanol required for above given reaction will be 19.22 mg/L

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