Stabilization Remediation of Cd in Contaminated Soil Using Biochar-Palygorskite Composite
In order to achieve efficient and environmentally friendly remediation of soil contaminated by heavy metal,the biochar-palygorskite composites(BC/PAL)were synthesised by slow oxygen limited pyrolysis.The effects of BC/PAL addition on soil physical and chemical properties,leaching toxicity and fraction of Cd in soil,growth status of maize and enrichment and transport of Cd in crop were investigated,so as to evaluate the potential ecological risk and stabilization effect of Cd in soil after repaired by BC/PAL.The results showed that soil pH increased significantly after adding BC/PAL.Compared with CK,pH increased by 1.14 at the dosage of 6%.When the dosages of BC/PAL were 6%and 8%,the TCLP leaching toxicity of Cd in soil was more than 60%lower than that of CK.After the addition of BC/PAL,the speciation of Cd in soil transformed from active state to stable state.Meanwhile,it reduced the stress of Cd on maize and promoted the growth of crop.When the dosage was 6%,the fresh weight of corn increased by 221.43%.BC/PAL reduced the potential ecological risk and bioavailability of Cd in soil significantly.It was an efficient and environmentally friendly soil remediation material.
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