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Tannery led chromium toxicity is one of the major threats to public health in developing countries, where most of the hides are treated at local cottage industry level and chromium liquor is released without detoxification. In this connection, the present study was conducted to develop a reliable cost effective fungal-based biosorbent for chromium removal. Six strains of Aspergillus niger were isolated from various environmental conditions and assessed for chromium tolerance. Biosorption potentials of two different biomass, i.e., live and dead, of selected Aspergillus niger ZH2 was investigated as a function of appropriate equilibrium time, pH, temperature, concentration of biosorbent and adsorbate in batch system. The chromium uptake by these biomasses was quantitatively evaluated using Langmuir and Freundlich isotherms. In order to determine the best fit isotherm, three error analysis methods were used to evaluate the data: correlation coefficient, residual root mean square error and chi-square test. Maximum adsorption capacity (qmax) was calculated to be 322.60 and 12.00 mg/g for live and dead biomass respectively. Application of Langmuir isotherm showed that live biomass was more favorable (95% CI, 1.053-8.718) than dead biomass in removing chromium and thus can serve as better biosorbent.

Comparative Analysis of Biosorption Potential for Chromium Removal by Live and Dead Biomass of Aspergillus niger ZH2