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Experimental Investigation of the Production of Carbon(iv)oxide (CO 2 ) from Brewers Spent Grain using Anaerobic Digester
Abstract
In this study, fresh brewers spent grain from a Brewery in Port Harcourt, was used to generate biogas, and the rate of carbon dioxide production was examined as a fractional component of the biogas. Additionally, daily records of the anaerobic digestion process temperature and pressure buildup were recorded. The analysis result revealed that the pH values before and after the examination were 7.45 and 7.26, respectively, and that the temperature fluctuations between 28 0 C and 34 0 C were recorded. The results showed that the temperature range recorded indicated mesophilic temperature and that biogas production was favored by the process, with the relative abundance of the constituent of the biogas (ppb) being: 79.25ppb CH 4 (methane), 45.53ppb CO 2 (carbon dioxide), 21.42ppb O 2 (oxygen), 49.40ppb N 2 (nitrogen), and small and variable quantities of other compounds like H 2 S (hydrogen sulfide), NH 3 (ammonia), and many VOCs (volatile organic compounds) as observed from a GC analysis. However, as the time increases, the pressure increased non-linearly, suggesting the impact of biogas accumulation. The study also highlights the potential of producing carbon(iv)oxide from biogas through the breakdown of spent grain from breweries to mitigate the high cost of carbon(iv)oxide purchase by the food and beverage industries.
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