Utilization of water hyacinth (Eichhornia crassipes) to reduce the amount of heavy metals from industrial waste-water
1988
Kaowtip Jainturakit (Ubonratchathanee Agriculture College, Ubon ratchathani (Thailand)) | Pimol Rienvatana
Utilization of water hyacinth (Eichhornia crassipes) to remove Cr, Zn, Ni, Cu, Pb and Cd from industrial waste-water of electrical circuit board unit of Tanin Industry, Co., Ltd. was studied by this research project. The atomic absorption spectrophotometry was used to analyze heavy metals from waste-water and from plant tissues of water hyacinth. The absorptivity of heavy metals by water hyacinth was increased by the first 3 days, then the absorptivity decreased by the exponential curve with the increasing of detention time up to 10 days. The experimental conditions, for example, volume of waste-water, detention time and concentration of heavy metals were maintained constant. The medium-size of water hyacinth may remove and absorb more heavy metals than large and small sizes. The amounts of heavy metals accumulated in the blades and petioles of water hyacinth were found to be in the ranges of 11.5-11.8 mg/l gm dried weight and 6.3-6.9 mg/l gm dried weight respectively. The tolerance of water hyacinth to heavy metals was shown as follows: Cr, Zn Ni, Cu Pb, Cd. The removal efficiencies of heavy metals have been found to be: 89.86 % for Cr, 91.09 % for Zn, 65.88 % for Ni, 60.85 % for Cu, 100 % for Pb and Cd by using medium size water hyacinth. The removal efficiencies of heavy metals for small and large sizes of water hyacinth were less effective than the medium size by 2 to 6 %.
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This bibliographic record has been provided by Thai National AGRIS Centre, Kasetsart University