The wastewater from an ethanol production facility contains 0.2% (w/w) ethanol. The wastewater flow is 250,000 gpd (gallons per day). The wastewater is treated in a mesophilic anaerobic digester at...

The wastewater from an ethanol production facility contains 0.2% (w/w) ethanol. The wastewater flow is 250,000 gpd (gallons per day). The wastewater is treated in a mesophilic anaerobic digester at 35°C and 80% of the waste ethanol is converted to biogas.

a. What is the concentration of COD in the wastewater if other organic compounds can be neglected? b. What is the methane production rate in the anaerobic digester? c. What are the approximate compositions of the biogas produced in the anaerobic digester? d. If the waste ethanol is utilized for hydrogen production and the conversion efficiency is 90%, what is the approximate hydrogen production rate?