Maryam Bahiraei
Abstract
Background and purpose: Urban waste leachate due to had organic matter, minerals and heavy metals as one of the environmental problems has require treatment. Surface absorption is one of the methods used in absorbing contaminants by absorbent materials. In this study, the efficiency of removal of zinc ...
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Background and purpose: Urban waste leachate due to had organic matter, minerals and heavy metals as one of the environmental problems has require treatment. Surface absorption is one of the methods used in absorbing contaminants by absorbent materials. In this study, the efficiency of removal of zinc from leachate of landfill waste in Hamadan city by absorbent of banana skin modified by acidic solution has been investigated.Materials and Methods: In study of descriptive-analytical, the effect of contact time, adsorbent amount, pH and concentration variables performed on the efficiency of Zn metal removal from leachate. In order to investigate the interaction between the adsorbent and the absorbed object were used the absorption models of Langmuir and Freundlich isotherm and aspect investigation the velocity of the adsorption process were used from the adsorption kinetics of first and second order pseudo-adsorption.Results: The highest efficiency of zinc removal (92%) was caused by adsorbent of banana fruit skin modified in the optimum pH 7, the contact time 70 minutes, the adsorbent amount 6 g/l concentration 1 mg/l. The maximum absorbent absorption capacity was also determined 34 mg/g. The results showed that the behavior of the desired process followed Langmuir adsorption isotherm model and its kinetics is adapted to the second-order pseudo-reaction.Conclusion: The use of natural adsorbent banana fruit skin modified by nitric acid solution has a high ability to remove zinc metal from leachate and can be used as an appropriate replacement for reducing the problems caused by common chemical adsorption.