Indoor Experimental Study on Remediation of Cadmium-Contaminated Red Clay by Immobilized Microbial Technology
To investigate the efficacy of immobilized microorganism technology in remediating cadmium(Cd)con-tamination in red clay and its impact on environmental pollution,we conducted a series of basic physical tests,un-confined compressive strength tests,toxic leaching tests,and heavy metal extraction tests.Activated carbon served as the carrier with Bacillus pasteuri as the strain.Results revealed Bacillus pasteuri's robust cadmium ion toler-ance.Compared to either microorganism or activated carbon alone,immobilized microorganism exhibited superior remediation efficacy.Unconfined compressive strength of soil containing 14％activated carbon and microorganisms reached 229.7 kPa,a 174.4％increase over cadmium-contaminated soil.Within 21 days,cadmium leaching con-centration in soil containing 10％activated carbon and microorganisms decreased to 0.002 mg/L,down by 99.8％compared to Cd-contaminated soil samples.After remediation,cadmium in soil transitioned from a weak acid state to reducible and residual states.In summary,immobilized microorganism technology demonstrates effective remedia-tion of cadmium-contaminated red clay,particularly at a 10％activated carbon concentration.These findings offer valuable insights for addressing cadmium pollution in red clay in Guizhou Province.
red clayBacillus pasteuriiimmobilized microbial technologyCd contaminationsoil remediationscanning electron microscope(SEM)
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