Abstract
Arsenic is one of the most toxic heavy metals to the environment which cause community health problem due to its high toxic nature. Several physiochemical techniques, such as adsorption, ion exchange, lime softening, reverse osmosis, coagulation and precipitation are used for arsenic removal but in this study, adsorption was used because of its simplicity to use and availability of a wide range of adsorbents. Adsorption is the process which is used for the removal of heavy metals from wastewater. Although there are Various adsorbents methods used to remove different type of heavy metal ions for study, iron impregnated activated carbon which was derived from sugarcane bagasse, was investigated as potential adsorbent for the removal of arsenic from aqueous solution. The synthetic wastewater was prepared in the laboratory to conduct the experiments. Batch experiments were conducted to obtain the optimum conditions for arsenic adsorption. Effect of experimental parameter such as pH, adsorbent dose, and initial arsenic ion concentration was determined at constant contact time of 30min and atmospheric temperature. The optimum conditions obtained were, pH 7, 1mg adsorbent dose and initial concentration of 20mg/L. Adsorption behavior could be described using the Langmuir and Freundlich isotherm models. Adsorption data was well fitted in Langmuir isotherm model. The maximum adsorption efficiency was found to be 96.5% at optimum experimental parameters of pH 7, adsorbent dose of 1g and initial arsenic concentration of 20mg/L. Keywords: Chemical activation, Carbonization, Impregnation, Activated Carbon, Adsorption, Settling, Filtration, Arsenic Removal DOI: 10.7176/CER/12-10-03 Publication date: October 31 st 2020
Highlights
The presence of arsenic in the environment is ever–present in the world due to natural and anthropogenic sources
The adsorptive removal of arsenic from aqueous solutions, by utilizing iron impregnated activated carbon derived from sugarcane bagasse (Fe-SAC) was investigated at different initial ion concentration, adsorbent dosage and pH levels
To assess the potentiality of the adsorbent, the influence of process parameters such as pH, adsorbent dosage, and initial metal ion concentration on the removal efficiency were studied with batch adsorption experiments
Summary
The presence of arsenic in the environment is ever–present in the world due to natural and anthropogenic sources It exists in the earth‘s crust and is mobilized by natural weathering reactions, biological activity, geochemical reactions, and volcanic emissions[1].Concentrations as high as 5 mg/L of arsenic have been found in groundwater from arsenic–rich areas, and geothermal influences can increase arsenic levels, even up to 50 mg/L. In order to minimize the health risk, the World Health Organization (WHO), United States Environmental Protection Agency (USEPA), and health Canada have reduced the maximum allowable contamination level (MCL) of total arsenic in drinking water from 10 to 50μg/L. This stringent regulation poses a major compliance challenge to the existing water supply systems[3]
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