Effect of mild-temperature thermo-alkaline pretreatment on the solubilization and anaerobic digestion of spent coffee grounds

6Citations
Citations of this article
18Readers
Mendeley users who have this article in their library.

Abstract

Mild-temperature thermo-alkaline pretreatment of spent coffee grounds (SCG) was studied to improve its solubilization and methanation. The simultaneous effects of NaOH concentration (0-0.2 M) and temperature (60-90 °C) were investigated. Significant solubilization of SCG was achieved by the pretreatment, particularly under high-NaOH-concentration and hightemperature conditions. However, adding NaOH above a certain concentration adversely affected the methane production. Therefore, the degree of solubilization (SD) correlated poorly with methane yield (Ym). Response surface models of SD and Ym were successfully generated. The maximum response of SD (36.4%) was obtained at 0.18 M NaOH and 90.0 °C, while that of Ym (263.31 mL CH4/g COD added) was obtained at 0.13 M NaOH and 70.5 °C. Hydrogenotrophic Methanospirillum species were the dominant methanogens in all the SCG digestion tests. It is likely that NaOH concentration had a more significant influence on the development of microbial community structure, particularly of methanogens than temperature.

Cite

CITATION STYLE

APA

Kim, D., Kim, J., & Lee, C. (2018). Effect of mild-temperature thermo-alkaline pretreatment on the solubilization and anaerobic digestion of spent coffee grounds. Energies, 11(4). https://doi.org/10.3390/en11040865

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free