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Author: search.filters.author.Sawangkeaw, RuengwitSubject: search.filters.subject.Spent coffee grounds

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    Technoeconomic analysis of biofuel production from spent coffee grounds using supercritical ethyl acetate
    (2026-03-01)
    Supang, Wirasinee
    ;
    Ngamprasertsith, Somkiat
    ;
    Sakdasri, Winatta
    ;
    Sawangkeaw, Ruengwit
    This study is a techno-economic analysis of biodiesel production from spent coffee grounds (SCGs) using ethyl acetate as an extracting solvent and a reactant through interesterification under supercritical conditions—a process called SCEA. Aspen Plus V12 was employed to simulate the SCEA process compared to the conventional biodiesel production process. Both processes operated at an original feed rate of 24,225 tonnes per year, but the production capacities of the conventional and SCEA processes were 1000 tonnes per year and 1800 tonnes per year, respectively. Because of the simplicity of SCEA, the fixed capital investment costs were lower than those of the conventional process. However, at the original feed rate, neither process was profitable within a project lifetime of 20 years. The production capacity of SCEA was increased to 4 times, 8 times, and 16 times its original size to identify the most effective scale for the production facility. The SCEA process commenced successfully with a production capacity of 7500 tonnes per year, but the payback period of 19.5 years was deemed unsatisfactory. The production capacities of 15,000 tonnes per year and 30,000 tonnes per year provided the payback periods of 7.67 years and 6.08 years, respectively. Nonetheless, the 15,000-ton plant requires 193,798 tonnes SCGs per year as feedstock, which is 12 times the annual coffee production in Thailand. Hence, this project is well-suited for large coffee producers when utilizing SCGs as a singular feedstock. Combining other feedstocks, such as microalgae, non-edible seeds, and waste fruit seeds, with SCGs presents an optional pathway for future research on biodiesel production.
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    Item type:Publication,
    Production of Coffee oil and Bioactive Peptides from Spent Coffee Grounds via Supercritical Carbon Dioxide Extraction and Enzymatic Hydrolysis
    (2024-04-01)
    Hunsub, Panusorn
    ;
    Ponmana, Kanokporn
    ;
    Ngamprasertsith, Somkiat
    ;
    Sakdasri, Winatta
    ;
    Karnchanatat, Aphichart
    Supercritical carbon dioxide (SCCO<inf>2</inf>) extraction was applied for recovering non-polar compounds in spent coffee grounds (SCGs) before enzymatic hydrolysis was performed. The SCCO<inf>2</inf> extracted oil yield of 11.93 wt% was observed at 30 MPa and 50 °C. The detectable volatile compounds in SCGs oil were aldehydes and flavor compounds classified as furans. Although the degree of hydrolysis of SCGs and defatted SCGs (DFSCGs) were not significantly different, the soluble protein of DFSCGs was higher than that of SCGs. Electrophoretic profiles of SCGs and DFSCGs comprise polypeptide bands at < 20 and ~ 24 kDa, which are mainly derived from 11S globulin subunits. After hydrolysis, the molecular masses of 4–20 and 24 kDa were virtually eliminated, thus releasing polypeptides with molecular masses < 4 kDa. Furthermore, the DFSCGs hydrolysate had higher total phenolic content and antioxidant capacity than that of SCGs hydrolysate. Pretreatment of SCGs with SCCO<inf>2</inf> enhances enzymatic accessibility, improves the quality of protein hydrolysate, and procures SCGs oil as a by-product. Graphical Abstract: (Figure presented.)