The feasibility of using constructed wetlands plants to produce bioethanol



The feasibility of using different constructed wetlands (CWs) plants for production of ethanol was investigated. Pretreatment of different dried materials with 1% (wt/vol) NaOH was followed by solid–liquid separation and enzymatic hydrolysis, then fermentated with Pichia stipitis. Five type of sugar were detected in the hydrolysis, including glucose, xylose, and other three unknown sugars. Aspidistra elatior showed the highest total sugar yield (86.60%), and Thalia dealbata showed the lowest yield (23.65%). The highest ethanol production was 8.27, 6.47, and 5.97 g/100 g dry mass from Iris pseudacorus Linn, Zantedeschia aethiopica Spreng, and Eichhornia crassipes, respectively. And the theoretical ethanol yield was 53.78%, 90.78%, and 80.65%. A satisfactory value in comparison to the data from corn stover (7.92 g/100 g dry mass and 49.17% theoretical ethanol yield). However, Nephrolepis auriculata and Veronica undulata Wall couldn't produce ethanol in our work. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 276–281, 2015