biosorbents in separation of heavy metals
of Biotechnology,Kalinga University, Naya Raipur (C.G.)
disposal of heavy metal wastes becomes a serious problem with the advancement in
the nuclear energy sector. The radionuclides arising from nuclear power plants
and mining operations poses a serious threat to the environment due to their long-lived
property and probability of leaching of these radionuclides from geological repositories
are dangerous to the human health due to their high transferability, high
solubility, long half-lives and easy assimilation in living organisms among the
fission by-products. So radionuclide and heavy metal pollution by various
nuclear and other industrial activities is matter of concern. The conventional
treatment methods mostly ineffective or highly expensive for these radio waste.
physico-chemical and biological processes are available for removal of heavy
metals from industrial waste before discharging into the environment.
Biological processes such as sewage and water purification treatments have been
used for several years due to the potential role of microorganisms to detoxify
organic and inorganic pollutants.
due to its simplicity, analogous operation to conventional ion exchange
technology, apparent efficiency and availability of biomass and waste
bio-products has been claimed as a promising technology for pollutant removal
and/or recovery from solution.Sorption is a physico-chemical process by which
one substance becomes attached to another. Biosorption is a physico-chemical
process that can be simply defined as the removal of substances from solution
by biological material. The biosorption process therefore involves a solid
phase (biosorbent) and a liquid phase (solvent: normally water) containing the
dissolved or suspended species to be sorbed(sorbate). Microbial biomass
(bacteria, cyanobacteria, yeast, fungi), algae, waste biomass from various food
industry and biotechnological processes, active sludge, plant and wood waste
biomass, biomass containing chitin and chitosan may be used as biosorbents.
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