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Kim, Jaai
School of Urban and Environmental Engineering
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Effect of Mild-Temperature Thermo-Alkaline Pretreatment on the Solubilization and Anaerobic Digestion of Spent Coffee Grounds

DC FieldValueLanguage
dc.contributor.authorKim, Danbeeko
dc.contributor.authorKim, Jaaiko
dc.contributor.authorLee, Changsooko
dc.date.available2018-05-04T00:49:21Z-
dc.date.created2018-04-27ko
dc.date.issued201804ko
dc.identifier.citationENERGIES, v.11, no.4, pp.865 -ko
dc.identifier.issn1996-1073ko
dc.identifier.urihttp://scholarworks.unist.ac.kr/handle/201301/24027-
dc.identifier.urihttp://www.mdpi.com/1996-1073/11/4/865ko
dc.description.abstractMild-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 high-temperature 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.ko
dc.languageENGko
dc.publisherMDPI AGko
dc.subjectanaerobic digestionko
dc.subjectmicrobial community structureko
dc.subjectresponse surface analysisko
dc.subjectspent coffee groundsko
dc.subjectthermo-alkaline pretreatmentko
dc.titleEffect of Mild-Temperature Thermo-Alkaline Pretreatment on the Solubilization and Anaerobic Digestion of Spent Coffee Groundsko
dc.typeARTICLEko
dc.identifier.pid2042null
dc.identifier.pid1263null
dc.identifier.rimsid30202ko
dc.identifier.scopusid2-s2.0-85045375541ko
dc.identifier.wosid000434703400176ko
dc.type.rimsAko
dc.identifier.doihttp://dx.doi.org/10.3390/en11040865ko
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