Abstract
This work presented the use of red mud (bauxite ore processing waste) in removal of lead ions in water samples. For this 0.1 g of red mud has been used as adsorbent which suspended in 10 ml of lead solution with the concentration of 50 mg l -1 for about 1 h. After that the lead concentration in the samples taken from the red mud treated lead solution measured with atomic absorption spectroscopy (AAS). The effect of some parameter which is important in adsorption of lead on red mud such as suitable adsorbent dosage, pH and contact time of solution and adsorbent was investigated. The result shows that red mud as solid waste and low- cost adsorbent can be successfully used for the removal of lead ion from aqueous solution.
Highlights
The presence of heavy metals in streams, lakes, and groundwater reservoirs has been responsible for several health problems with plants, animals, and human beings
Red mud emerges as a residue during alkalineleaching of bauxite in Bayer process
As the figure shows by increasing the adsorbent dosage from 0 to 0.1 g for 10 ml of lead solution, the lead ions adsorbed a red mud increased
Summary
The presence of heavy metals in streams, lakes, and groundwater reservoirs has been responsible for several health problems with plants, animals, and human beings. A number of processes have been applied, with varying degree of success, to the treatment of water and wastewater. Some of these processes are coagulation, foam flotation, filtration, ion exchange, aerobic and anaerobic treatment, advanced oxidation processes, solvent extraction, adsorption, electrolysis, microbial reduction, and activated sludge. These technologies have shown some significant disadvantages, which include insufficient removal of pollutants, high capital costs, high reagents and/or energy requirements, and generation of toxic sludge or other waste products that require further safe disposal (Bhatnagar et al, 2011). Many have studied the application of red mud in wastewater treatment and red mud has been found to remove fluoride, chromium, hexavalent, dyes, heavy metals, and phosphate from aqueous solution (Zhao et al, 2009)
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