Abstract
The aim of this study was to investigate the effect of pH control by CO 2 pressurization on the enzymatic hydrolysis of herbaceous feedstock in the calcium capturing by carbonation (CaCCO) process for fermentable sugar production. The pH of the slurry of 5 % (w/w) Ca(OH) 2 -pretreated/CO 2 -neutralized rice straw could be controlled between 5.70 and 6.38 at 50 °C by changing the CO 2 partial pressure ( p CO 2 ) from 0.1 to 1.0 MPa. A mixture of fungal enzyme preparations, namely, Trichoderma reesei cellulases/hemicellulases and Aspergillus niger β-glucosidase, indicated that pH 5.5–6.0 is optimal for solubilizing sugars from Ca(OH) 2 -pretreated rice straw. Enzymatic saccharification of pretreated rice straw under various p CO 2 conditions revealed that the highest soluble sugar yields were obtained at p CO 2 0.4 MPa and over, which is consistent with the expected pH at the p CO 2 without enzymes and demonstrates the effectiveness of pH control by CO 2 pressurization.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.