Removal Of Cadmium From Waste Water Using
Saudi Activated Bentonite
Author(s)
S. S. Al-Shahrani
Abstract
Application of Saudi activated clay (bentonite) to remove cadmium from
wastewater was investigated. Natural local clay which was obtained from
Khulays bentonite deposit was selected and activated using sulfuric acid to
increase its adsorptive capacity. The removal characteristics of cadmium ions
from wastewater were investigated under various operating variables such as
contact time, initial metal concentration, clay dosage and solution pH. Batch
scale equilibrium adsorption was carried out for a wide range of initial metals
concentration. The results showed that the sorption of cadmium ions on Saudi
activated clay was relatively fast and the equilibrium was achieved after only
20 min. The sorption data suggests that solution pH was the most important
parameter in controlling cadmium sorption onto bentonite. They also showed
that increasing the initial cadmium concentration decreased cadmium removal
percentage due to the saturation of clay with cadmium ions. Furthermore, the
adsorption of cadmium increased with increase in solution pH. The adsorption
isotherm data were well fitted with both the linearized Langmuir and Freundlich
models.
Keywords: cadmium removal, Saudi bentonite, cadmium adsorption, heavy
metals removal, adsorption isotherm, adsorption kinetic.
1 Introduction
Heavy metals wastewaters are directly or indirectly discharged into the
environment excessively in many countries. Heavy metals are not biodegradable
as organic contaminants and may accumulate in living organisms. Many heavy
metal ions are known to be toxic or carcinogenic such as cadmium [1]. Cadmium
Keywords
cadmium removal, Saudi bentonite, cadmium adsorption, heavy
metals removal, adsorption isotherm, adsorption kinetic.
Related Book
Other papers in this volume
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