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The metal bioaccumulation capability of a common anchored hydrophyte, Typha angustifolia L. was studied in a green house trial. The plants could absorb significant amounts of the heavy metals like chromium, copper and zinc from tannery sludge. Different concentrations of tannery sludge were prepared in water and plants of T. angustifolia were exposed to the sludge for 30, 60 and 90 days. A significant reduction in sodium chloride percentage, chlorides and chemical oxygen demand (COD) was observed. The percentage reduction in all metals was significant. Cadmium and lead were found to be totally absent. A greater reduction of metals was observed in 30% concentration of sludge. A maximum reduction of 62% for Na, 42% for Cr, 38% for Cu and 36% for Zn was observed in 30% sludge after 90 days exposure of T. angustifolia. The bioaccumulation potential of T. angustifolia was greater for the heavy metals especially for Cr. The maximum metal uptake, observed after 90 days exposure of T. angustifolia, was 6,698 mg kg -1 for sodium, 20,210 mg kg

Bioaccumulation of metals from tannery sludge by Typha angustifolia L.