Phytoremediation of the coalmine effluent

► The Azolla pinnata and Lemna minor are tested for purification of coal mine effluent. ► Both macrophytes are highly efficient in detoxification of coalmine effluent. ► Both macrophytes brought down concentration of metals below the permissible limits within one week. ► They have wide range of metal retention potential (Fe, Mn, Ni, Zn, Cu, Pb, Cr and Cd). ► The A. pinnata is more tolerant to CME toxicity than L. minor.