3. Methanol (CH3OH) can be degraded as shown in the reaction below. Answer the f

Question

3. Methanol (CH3OH) can be degraded as shown in the reaction below. Answer the following questions if methanol is present in a water at a concentration of 260 mg/L and the water flowrate is 1.7 million gallons per day (mgd). CH3OH+ 1.5 O2 right arrow CO2+2H2O a. What amount of carbon dioxide (CO2) will be produced each day (in lbs and kg)? b. How much oxygen (O2) will need to be supplied to degrade the methanol (in mg/L and lbs/day) if the oxygen transfer process is 48% efficient (i.e., for every pound of O2 added, only 0.48 pounds react)?

Explanation / Answer

1 gallon = 3.8 L, 1.7 million galllon = 1.7 x 3.8 x 106 L = 6.5 x 106 L, Total MeOH in that water = 6.5 x 106 x 0.26 g;

moles of MeOH = 6.5 x 106 x 0.26/32 moles

According to the above equation, 1 mole of MeOH produces 1 mole of CO2, so moles of CO2 produced per day 6.5 x 106 x 0.26/32 moles.

(b) O2 required = 6.5 x 106 x 0.26/32 x 1.5 (according to the above eqan)

= 6.5 x 106 x 0.26/32 x 1.5 (according to the above eqan) x 0.48

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