Isolation and process parameter optimization of Aspergillus sp. for removal of chromium from tannery effluent

Five morphologically different fungi were isolated from leather tanning effluent in which Aspergillus sp. and Hirsutella sp. had higher potential to remove chromium. The potential of Aspergillus sp. for removal of chromium was evaluated in shake flask culture in different pH, temperature, inoculums size, carbon and nitrogen source. The maximum chromium was removed at pH 6, temperature 30 °C, sodium acetate (0.2%) and yeast extract (0.1%). Aspergillus sp. was applied in 2 l bioreactor for removal of chromium, and it was observed that 70% chromium was removed after 3 days.