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Pollution due to heavy metal becoming a major environmental threat being faced by the world today and also becomes a key concern in many developing as well as developed countries of the world. Large amount of heavy metals such as, nickel, Copper and zinc released by number of electroplating and metalworking industries. These metal pollutants are discharged directly or indirectly into waterbodies. Industrial waste wasters contain large amount of metals ions and treatment of wastewater is needed in order to avoid pollution of waterbodies before disposal. One of the important metal is copper, is beneficial to human being but in higher concentration it is highly toxic like other heavy metal. Conventional methods for the detoxification or removal of heavy metals are time consuming and highly expensive. Microorganisms like algae, actinomycetes, bacteria, fungi and yeasts have the capacity to tolerate and to accumulate heavy metal ions from the polluted environment, bioremediation by fungi is widely explored and reduction of metal ions by bioadsorption technique gained a lot of attention during the past decade. Biosorption technology mainly because of its low cost and high metal binding efficiency, offers promising alternative method for the removal of metal ions. Therefore the present investigation is based on the bioadsorption capacity of NaOH pretreated Aspergillus species namely A. flavus, A. fumigatus, A. niger and A. terreus for the removal of metal ions. Fungal growth was tested by using 3 different concentrations of CuSO4 (2mM, 4mM, and 8mM) amended in PDA medium. Fungal growth was observed only at 2mM and 4mM concentrations but no fungal growth was observed at 8mM. The biosorption capacity of both living species and NaOH pretreated species of Aspergillus was compared. In the present investigation, NaOH pretreated species of Aspergillus showed highest biosorption potential in comparison to live biomass of Aspergillus. In case of live biomass, A. niger showed maximum biosorption potential in comparison to other fungal species.

Investigation on the Biosorption Potential of Alkali Pretreated Aspergillus sp. Biomass for the Removal of Copper