Biosorbent for removal of heavy metals

A product has been developed from abundantly available lignocellulosic agrowaste for the effective removal of eight different heavy metals such as Pb2+, Cd2+, Hg2+, Co2+, Ni2+, Mn2+, Zn2+, Cu2+ separately or in combination from industrial contaminated water. Contaminated industrial waters are generally cleaned by currently used water treatment technologies involving chemical precipitation, adsorption using activated carbon, evaporation, electrochemical treatment and the use of ion-exchange resins. However, their high cost restricts large-scale use for the abatement of heavy metal pollution and in recent years the search for low-cost materials has grown. This biosorbent could provide cheap alternative of costly conventional techniques because of its higher fixation capacity and effectiveness in a wide range of pH such as alkaline, slightly alkaline, neutral and even slightly acidic waters. Efficacy of biosorbent depends on the quality of wastewater, hence biosorbent has to be tested for heavy metals removal in the field before use and also equipment has to be designed based on the facilities available at the site.



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