Environmental Engineering Reference
In-Depth Information
anionic hydroxide complexes decreases the concentration of free cadmium
ions, thereby the biosorption capacity of cadmium ions decreases (Stephen and
Sulochana, 2004).
C
ONCLUSION
Cadmium is highly toxic metallic pollutant present in the environment and
numerous health risks could be associated with acute and chronic exposure of
living beings through various means. Thus, there is an evident need to escape
from cadmium exposure either by recovery and reutilization or inertization of
cadmium from the environment.
Inertization of cadmium depends on the state of cadmium waste. Solid
cadmium waste could be directly inertized and disposed off, but liquid and
gaseous cadmium waste first convert into solid or immobilize stage, followed
by inertization process and the final product could be disposed off. Various
techniques are available to solidify liquid and gaseous cadmium waste into
solid waste, such as adsorption by activated carbon, reverse osmosis,
electrocoagulation, composting, solidification/stabilization etc. However, in
recent times, relatively a new method ofbio-sorption using agro waste and its
derivativesis gaining popularityowing to its variousadvantages, such as low
cost, highefficiency and minimizationof chemicals/or biological sludge
formation. The chemical composition of agro-wastes containing, aldehydes,
carboxylic, ketones, phenolic and ether organic groups gives them an
advantage of molecular binding with heavy metals making the inert matrices
more stable. Hence, it complies with the ecological cycle of managing Cd
residues through reutilization of other wastes resulting in an exchange
mechanism to control pollution.
R
EFERENCES
Ahluwalia S., Goyal D. Removal of heavy metals from waste tea leaves from
aqueous solution.
Engineer of Life Sci
2005; 5: 158-162.
Asma S, Washeed AM, Muhammed I. Removal and recovery of heavy metals
from aqueous solution using papaya wood as a new biosorbent.
Separation and Purification Technol
2005; 45: 25-31.
Augustine E, Yuh-Shan H. Effect of pH on cadmium biosorption by coconut
copramea.
Hazardous Materials
2007; 139: 356-362.
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