WHATSAPP now r.^ òuly / 9 ga @ JwKal S-40 7. (15pt) A laboratory-scale anaerobic
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Question
WHATSAPP now r.^ òuly / 9 ga @ JwKal S-40 7. (15pt) A laboratory-scale anaerobic digester at 37°C is fed synthetic v g/L butyric acid at the rate of 50 L/day. What is the theoretical methane production in L/day (assuming complete conversion) 8. (20pt) The effluent from an anaerobic digester (10 L in size) has a COD concentration of 5,540 mg/L, among which 50% is soluble. The gas analysis shows that a total of0072 kg of CH4 is produced at the end of the process. Assuming that methanogens can convert 70% of the insoluble COD in the influent into soluble COD and use soluble COD to produce CHi gas, what is the total COD level in the influent that contains 30% of soluble COD?Explanation / Answer
The theoritical overall reaction of anaerobic Methanogensis of butyric acid is
C4H8O2 +6 H2 ----> 4CH4 + 2H2O
Mwt 88 16
One mole of butryic acid gives four mole of methane
88 gm to =4*16 = 64 gm of methane
Weight of acid = 10*50 = 500 g/day
for 500 gm/day gives =64*500/88 = 363.64 gm/day of Methane
gmmoles of methane = 22.72 gm moles/day
Assume Methane is ideal gas, at 37C and 1 atm pressure
PV = nRT
V = 440.26 Lt/day
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