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Title

REMOVAL OF PB2+ ION FROM INDUSTRIAL WASTEWATER BY ULMUS SYRINGA VULGARIS TREE LEAVES

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Abstract

 HEAVY METAL IONS ARE NOWADAYS AMONG THE MOST IMPORTANT POLLUTANTS IN SURFACE AND GROUND WATER. THEY ARE OFTEN DISCHARGED BY A NUMBER OF INDUSTRIES, AND THEY ARE EXTREMELY TOXIC AND HARMFUL FOR PLANTS AND ANIMALS EVEN AT LOW CONCENTRATIONS [1] THEREFORE, THE ELIMINATION OF THESE IONS FROM WASTE WATERS IS IMPORTANT TO PROTECT PUBLIC HEALTH. TRADITIONAL TECHNOLOGIES FOR REMOVAL OF HEAVY METALS FROM WASTE WATERS INCLUDE CHEMICAL PRECIPITATION ION -EXCHANGE, MEMBRANE SEPARATION, REVERSE OSMOSIS, EVAPORATION AND ELECTROLYSIS [2], MOST OF THESE METHODS GENERATED TOXIC SLUDGE [3]. THEREFORE, NEED TO FIND ALTERNATIVE METHODS WHICH ARE ENVIRONMENTALLY FRIENDLY, EFFECTIVE AND ECONOMIC IS NECESSARY. USING A VARIETY OF BIOLOGICAL MATERIALS INCLUDING MICRO-ALGAE AND SEAWEED, BACTERIA AND ECT. [4] HAD BEEN REPORTED BEFORE. LEAD HAS BEEN USED IN MANY INDUSTRIES AND THE REMOVAL OF LEAD IONS FROM WASTEWATERS IS SIGNIFICANT. PB2+ IS A HEAVY METAL POISON WHICH CAN FORMS COMPLEXES WITH OXO-GROUPS IN ENZYMES TO AFFECT VIRTUALLY ALL STEPS IN THE PROCESS OF HEMOGLOBIN SYNTHESIS AND PORPHYRIA METABOLISM. TOXIC LEVELS OF PB2+ IN MAN HAVE BEEN ASSOCIATED WITH ENCEPHALOPATHY, SEIZURES AND MENTAL RETARDATION. THE OBJECTIVE OF THIS STUDY IS: “TO INVESTIGATE THE BIO SORPTION POTENTIAL OF SYRINGA VULGARIS TREE LEAVES TO TREA WASTE WATERS CONTAMINATED WITH PB2+ ION”. ULMUS SYRINGA VULGARIS TREE LEAVES, WHICH ARE IN GREAT SUPPLY IN IRAN, WERE EVALUATED FOR REMOVAL OF PB2+ FROM AQUEOUS SOLUTION. MAXIMUM BIO SORPTION CAPACITIES FOR SYRINGA VULGARIS WERE MEASURED AS 290.98 MG/G FOR PB2+ ION, RESPECTIVELY. FOR SORBENT THE MOST EFFECTIVE PH RANGE WAS FOUND TO BE 6–5 FOR PB2+ ION. METAL ION BIO SORPTION INCREASED AS THE RATIO OF METAL SOLUTION TO THE BIOMASS QUANTITY DECREASED. CONVERSELY, BIO SORPTION/G BIO SORBENT DECREASED AS THE QUANTITY OF BIOMASS INCREASED. THE BIO SORPTION OF METAL ION INCREASED AS THE INITIAL METAL CONCENTRATION INCREASED. THE EQUILIBRIUM DATA FOR PB2+ ION BEST FIT THE LANGMUIR ADSORPTION ISOTHERM MODEL. KINETIC STUDIES SHOWED THAT THE BIO SORPTION RATES COULD BE DESCRIBED BY A SECOND ORDER EXPRESSION. THE SORBENT COULD BE REGENERATED USING 0.5M HCL DURING REPEATED BIO SORPTION–DESORPTION CYCLES. BIO SORPTION OF PB2+ ION WAS HAPPENED IN THE PRESENCE OF NA+, K+, MG2+ AND CATIONS. THE RESULTS FROM THESE STUDIES SHOW A NOVEL WAY OF USING SYRINGA VULGARIS TREE LEAVES TO REMOVE PB+2 ION FROM METAL-POLLUTED WATER.

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