Biogas upgrading on dairy digesters
Frear, Craig, 1964-
Evans, Daniel A.
Kruger, Chad E.
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Recently the prices for electricity production have fallen in many parts of the US, reducing the profitability of digesters. As received electrical rates have continued to decrease, interest in other higher value end-uses for biogas has grown. Among upgraded products, hydrogen, gasoline, and methanol all have high conversion costs at present. Renewable natural gas, less expensive to produce, is utilized in a variety of different forms including pipeline quality gas for use as a thermal energy, compressed natural gas (CNG) fuel, and liquefied natural gas. CNG is currently the most popular end-use of upgraded dairy biogas due to economics and will therefore be highlighted here.