Butanol production from hydrothermolysis-pretreated switchgrass: Quantification of inhibitors and detoxification of hydrolyzate
2015
Liu, Gan | Atiyeh, Hasan K. | Pardo-Planas, Oscar | Ezeji, Thaddeus C. | Ujor, Victor | Overton, Jonathan C. | Berning, Kalli | Wilkins, Mark R. | Tanner, Ralph S.
The present study evaluated butanol production from switchgrass based on hydrothermolysis pretreatment. The inhibitors present in the hydrolyzates were measured. Results showed poor butanol production (1g/L) with non-detoxified hydrolyzate. However, adjusting the pH of the non-detoxified hydrolyzate to 6 and adding 4g/L CaCO3 increased butanol formation to about 6g/L. There was about 1g/L soluble lignin content (SLC), and various levels of furanic and phenolic compounds found in the non-detoxified hydrolyzate. Detoxification of hydrolyzates with activated carbon increased the butanol titer to 11g/L with a total acetone, butanol and ethanol (ABE) concentration of 17g/L. These results show the potential of butanol production from hydrothermolysis pretreated switchgrass.
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