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77MICROBIAL REMEDIATION OF SOILS CO-CONTAMINATED WITH 2,4-D AND CADMIUM |
T.M. Roane and I.L. Pepper, 429 Shantz Building #38, Soil, Water and Environmental Science, The University of Arizona, Tucson, AZ 85721 |
One-third of organically-polluted sites are also contaminated with metals; however, the bioremediation potential of such sites is not clear. While metals are thought to inhibit the abilities of microbial communities to degrade organic pollutants, several microbial-metal resistance mechanisms are known to exist. This study utilizes cadmium- resistant soil microorganisms to enhance the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) in the presence of cadmium.
Cadmium-resistant microorganisms were isolated from both a 40-year-old metal-contaminated soil and an uncontaminated soil. Interestingly, using BIOLOG and ERIC PCR fingerprints, it was found that the uncontaminated soils had a greater diversity of cadmium-resistant isolates at low concentrations of cadmium, while cadmium-contaminated soils had more diversity at higher cadmium concentrations. Preliminary identification of cadmium-resistant isolates included Bacillus, Pseudomonas, and Xanthomonas spp. Isolates were resistant up to 80 ppm cadmium. Using conventional degradation studies, in conjunction with molecular analyses, the potential of these cadmium-resistant micro-organisms to degrade 2,4-D in the presence of cadmium was evaluated. Key words: metal-resistant, microorganisms, co-contaminated soils, remediation
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