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Bioadsorbents for remediation of heavy metals: Current status and their future prospects

Gupta, Vinod Kumar;Nayak, Arunima;Agarwal, Shilpi

  • Received : 2015.02.16
  • Accepted : 2015.03.24
  • Published : 2015.03.31

Abstract

The biosorption process has been established as characteristics of dead biomasses of both cellulosic and microbial origin to bind metal ion pollutants from aqueous suspension. The high effectiveness of this process even at low metal concentration, similarity to ion exchange treatment process, but cheaper and greener alternative to conventional techniques have resulted in a mature biosorption technology. Yet its adoption to large scale industrial wastewaters treatment has still been a distant reality. The purpose of this review is to make in-depth analyses of the various aspects of the biosorption technology, staring from the various biosorbents used till date and the various factors affecting the process. The design of better biosorbents for improving their physico-chemical features as well as enhancing their biosorption characteristics has been discussed. Better economic value of the biosorption technology is related to the repeated reuse of the biosorbent with minimum loss of efficiency. In this context desorption of the metal pollutants as well as regeneration of the biosorbent has been discussed in detail. Various inhibitions including the multi mechanistic role of the biosorption technology has been identified which have played a contributory role to its non-commercialization.

Keywords

Algae;Bacteria;Biosorption;Fungi;Plant organic waste;Toxic metal

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Acknowledgement

Supported by : Department of Science and Technology