The results of this study indicate that water
hyacinth can successfully be used for the removal of
low concentrations of Zn(II) and Cd(II). Water hyacinth
may be used in “Ecotechnology” (environmental
technology) in constructing wetlands. Wetlands help to prevent the spread of heavy metal contamination from land to the aquatic environment. High metal
removal rates of close to 100% have been reported both
in natural and artificial constructed wetlands. These
wetlands make a suitable alternative for wastewater
purification as they are easier to be constructed and
operated. Apart from that, they are also cost-effective
with no generation of toxic sludge which must be
stabilized prior to disposal into secure landfill.