METAL OF IRON (Fe) AND MANGAN (Mn) FROM WASTE WATER COAL MINING WITH FITOREMEDIATION TECHNIQUES WITH USING FLOATING FERN (Salvinia natans), WATER LETTUCE (Pistia stratiotes) AND WATER-HYACINTH (Eichornia crassipes) - Mardalena, Mardalena (Biology Department, Faculty of Mathematics and Natural Sciences, Sriwijaya University, 2018)