| Summary: | 碩士 === 國立臺灣大學 === 森林環境暨資源學研究所 === 106 === Phytoremediation is highly regarded as an alternative method for soil and groundwater pollution remediation globally. However, there is a need to explore the application for biomass harvested from polluted sites after remediation. Formosan alder (Alnus formosana) is a fast-growing, adaptable pioneer native tree species in Taiwan, and it is particularly suitable for reforestation. In this study, steam exploded Formosan alder (Alnus formosana) biomass were employed to investigate lactic acid production by SSF (simultaneous saccharification and fermentation) under impacts of different heavy metals. Impacts of different heavy metals on saccharification were also investigated. Negative impacts were for SSF by Cr3+ demonstrated under 1414.02 mg Cr3+ /L: fermentation by Lactobacillus casei and L. acidophilus obtained results of 19.65% and 12.84% compared to blank controls. Positive impacts for SSF by Cd2+ were demonstrated under 107.85 mg Cd2+ /L: fermentation by L. casei and L. acidophilus obtained results of 109.93 % and 112.69 % compared to blank controls. No impacts for SSF by Pb2+ up to 6832.65 mg Pb2+/L was found for both Lactobacillus strains. This study demonstrates that SSF for production of lactic acid from Formosan alder biomass is able to tolerate a wide range of heavy metal concentration regimes. Hence, this study provides the alternative for using biomass harvested from phytoremediation sites. Such biomass can be used as sustainable regenerative biomaterial, thereby further enhance the benefits of environmental remediation.
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