Bioaccumulation of Chromium by Indigenous Bacteria isolated from Industrial Area, Belur, Dharwad in Karnataka, India

Abstract

Chromium (Cr) contamination is a major environmental concern due to its toxicity and persistence. This study aimed to isolate and evaluate indigenous bacterial strains from Cr-polluted soils of the Belur Industrial area, Dharwad, Karnataka, India, for their bioremediation potential. Four Cr-resistant isolates- Enterobacter mori (BIDS I), Pseudomonas alcaliphila (BIDS II), Pseudomonas aestus (BIDS IV), and Aeromonas hydrophila (BIDS VI) were characterized morphologically, biochemically, and molecularly. Growth curve studies indicated their tolerance and adaptability to Cr stress. Bio-removal assays demonstrated that BIDS I removed up to 83% of Cr at 500 mg/L after 72 hours, while BIDS II, IV, and VI removed 75%, 69%, and 65%, respectively. Statistical analysis confirmed significant effects of initial Cr concentration on removal efficiency. These findings highlight the potential application of these indigenous strains for eco-friendly and efficient Cr bioremediation.