Study on Insitu Bioremediation of Cr(VI) in Porous Media
Abstract
Indigenous microorganism that show an ability for Cr (VI) reduction were isolated from a chromium-contaminated sediment. Sand column experiments were conducted using the isolated bacteria to investigate microorganism effects on Cr(VI) reduction in closed systems that simulated subsurface conditions. The results showed that when glucose and emulsified oil were used as carbon sources, the effective reduction of Cr(VI) can be achieved, and the reduction rate of Cr(VI) increases with the increase of carbon source. The reduction rate of Cr(VI) decreases with the increase of initial Cr(VI) concentration, which is consistent with the first-order reaction kinetics. The reaction rate constant decreases with the increase of initial Cr(VI) concentration. The reduction rate of Cr(VI) increased with the increase of the hydraulic residence time, that is, the emulsified oil has relatively high stability and low biodegradation rate, and can provide carbon source in the bioreduction process for a long time.
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DOI: https://doi.org/10.18686/pes.v2i1.1308
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