Acidic mine rejects of pyretic sulphur coal mines were treated with biochar prepared from different feedstocks (distilled waste of Cymbopogonflexuosus (lemongrass) and Cymbopogonwinterianus (Citronella) and the bark of Eucalyptuscitriodora. The quality of lixiviate collected at three intervals (0, 15, and 30 days) from each treated and untreated mine waste was examined, and holy basil (Ocimumsanctum) and East Indian senna (Cassiaangustifolia) bioassays were carried out. Results indicate that all three biochars improve the lixiviate quality, i.e., Enhanced the pH of lixiviate up to 3 units and reduces phytotoxicity. However, their magnitude of impact on lixiviates quality and phytotoxicity was different. The biochar prepared from the distilled waste of Cymbopogonflexuosus showed more promising results. The neutralizing capacity and dissolved organic carbon content were the significant factors for the discrimination of the amendments. The tolerance of O. sanctum and C. angustifolia was significantly different from each other for a particular treatment.
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