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Advisor(s)
Abstract(s)
This work aimed to evaluate the conversion potential of maize stover (MS) from phytoremediation of heavy metals contaminated soil to bioethanol. Thus, MS was submitted to an acid pretreatment with 3% (v/v) H2SO4, HCl, HNO3 or CH3COOH at 85 °C for 48 hours. An enzymatic hydrolysis step with Accellerase or Ultraflo was applied at 50 °C for 13 hours. Finally, Saccharomyces cerevisiae was used to ferment the glucose at 37 °C, followed by distillation to recover ethanol. The average yield in ethanol for the MS produced in the two contaminated soils was 0.51 and 0.32 gethanol/gMS for the MS treated with HCl and Accellerase and 0.39 and 0.27 gethanol/gMS for the MS treated with HNO3 and Ultraflo, respectively. For the MS produced in the control soil, the yield was 0.37 and 0.44 gethanol/gMS for the treatment with HNO3 and Ultraflo and HCl and Accellerase, respectively, being the differences in ethanol yield assigned to the dif-ferent cellulose/ hemicellulose content of the MS samples. No metals were detected in the ethanol recovered. This research demonstrated the feasibility of val-orization of MS from heavy metals contaminated soil phytoremediation through ethanol production, contributing to a more sustainable process of soil phytoreme-diation.
Description
Keywords
Biofuel Cadmium Heavy metal contaminated soil Phytoremediation Soil decontamination Zinc
Citation
Publisher
Springer