Influence of Impregnation Ratio on Chemically Modified Silica Sand for Heavy Metals Removal from Stabilized Landfill Leachate

Lo Ming Rui; Azrina Abd Aziz; Mohd Suffian Yusoff; Mohamad Anuar Kamaruddin
Landfill leachate generated from landfill normally contains high concentrations of organic and inorganic constituents. Consequently, the disposal of untreated leachate could be hazardous to both surrounding ecosystems and human beings. In the present study, the ability of chemically modified silica sand in reducing heavy metal concentrations for ferrous and zinc ions from stabilized landfill leachate were investigated. The effects of impregnation ratio (IR) on adsorption performance were studied in terms of adsorbent dosage, contact time, and pH. Equilibrium isotherms were analyzed by using Langmuir and Freundlich isotherms to describe the adsorption characteristics of the adsorbent. From the laboratory experiments, IR of 1.5 was found to be optimum for heavy metal adsorption, at the dosage of 20 g and pH 7. The adsorption isotherm data were fitted well to Freundlich isotherm with R2 value of 0.9862.
Stabilized Landfill Leachate; Heavy Metals; Silica Sand; Adsorption
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