science reporter magazine december 2017

science reporter magazine march 2017

Removing Heavy Metals

Even though metals are non biodegradable they can be transformed through processes such as sorption  methylation and complexation, and changes in valence state the current treatment practices for heavy metal removal from industrial wastes primarily rely on physical processes such as land filling leaching  chemical precipitation oxidation or reduction filtration ion exchange reverse osmosis  membrane technology, evaporation and electrochemical treatments gunatilake 2015 these techniques are not only expensive and labor intensive  they do not offer an effective solution for removal of heavy metals from contaminants as well in recent years the focus has shifted to biological methods of heavy metal remediation which involve the use of plants phytoremediation or microbes bioremediation  these methods, owing to their advantages such as in situ treatment of contaminants cost effectiveness and ability to reduce the amount of secondary pollution, have become an attractive alternative to the physic chemical methods.

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science reporter magazine november 2016