THE REDUCTION OF Cr(VI) IN SOIL BY Microbacterium sp. STRAIN SpR3 IN VERMICOMPOST CARRIER
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Abstract
Hexavalent chromium [Cr(VI)] is a pollutant originated from industrial activities. Microbacterium sp. strain SpR3 can be used as Cr(VI) bioremediation agent. The ability of bioagent to reduce Cr(VI) usually improves when inoculated in a carrier. This research aimed to assess the ability of Microbacterium sp. strain SpR3 to reduce Cr(VI) in soil and compare its ability when inoculated in vermicompost carrier. Observations were carried out for seven days on three different treatments, namely Microbacterium sp. strain SpR3 with and without vermicompost inoculated in sterile soils containing 50 ppm Cr(VI), and sterile soils containing 50 ppm Cr(VI) without bacterial inoculation. The observed variables were the number of bacteria, the concentration of Cr(VI) and the rate of Cr(VI) reduction by these bacteria in the soil at T0 (day 0) and T7 (day 7). It was concluded that vermicompost could be used as a carrier of Microbacterium sp. strain SpR3 as it could increase the number of the bacteria to 2 × 1010 CFU g-1 in soil and could reduce Cr(VI) at the rate of 0.095 mg L-1 h-1.
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