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REMEDIATION OF ACID MINE DRAINAGE-IMPACTED WATER BY VETIVER GRASS (CHRYSOPOGON ZIZANIOIDES): A MULTISCALE LONG-TERM STUDY
Kiiskila, J.D., D. Sarkar, S. Panja, S.V. Sahi, and R. Datta.
Ecological Engineering 129:97-108(2019)

The study developed a cost-efficient and sustainable floating treatment wetland system using vetiver grass (Chrysopogon zizanioides). Year-long large- and small-scale hydroponic experiments were used to determine the effectiveness of vetiver for treating acid mine drainage-impacted waters from the Tab-Simco mine site in southern Illinois. For the large-scale mesocosm study, vetiver rafts were suspended in 100-gal containers. Water quality was monitored every 28 days and at the end of the experiment (364 days); plant health was monitored by measuring changes in biomass and recording visual changes in root and shoot coloration and morphology. There was higher net removal of Fe (81%) and Pb (81%) with lower removal of Ni (38%), Zn (35%), SO42- (28%), Mn (27%), Cr (21%), Al (11%) and Cu (8.0%). Toxicity characteristic leaching procedure showed that vetiver biomass was not hazardous waste as a result of metal accumulation. From the small-scale experiment, there was near complete removal of SO42- (91%) and metals (90-100%) with the exception of Pb (15%) and Cu (0.0%).



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