不同孔径活性炭对镉铅污染土壤的动态修复研究

Study on Dynamic Remediation of Cadmium and Lead Contaminated Soil by Activated Carbon with Different Pore Sizes

测定微孔活性炭(MICAC)、介孔活性炭(MECAC)和大孔活性炭(MACAC)的理化性质和吸附特性,以及三者对重金属污染土壤的淋溶和大田原位修复的动态影响。三种活性炭比表面积大小为MICAC>MECAC≥MACAC。经三种活性炭处理后的淋出液的Cd(Ⅱ)和Pb(Ⅱ)浓度分别降为0.18~0.21 mg/L和0.063~0.067 mg/L。活性炭对大田土壤中Cd(Ⅱ)Pb(Ⅱ)含量影响为:MECAC≥MICAC>MACAC>CK;90 d的大田原位修复,MICAC处理土壤的Cd(Ⅱ)和Pb(Ⅱ)含量分别较对照组土壤分别下降78.57%和80.57%。适当添加3%的MECAC能有效吸附土壤中的Cd(Ⅱ)和Pb(Ⅱ)。

The physicochemical properties and adsorption characteristics of microporous activated carbon(MICAC), mesoporous activated carbon(MECAC) and macroporous activated carbon(MACAC) were determined, as well as the dynamic effects of the three activated carbons on the leaching and in situ remediation of heavy metal contaminated soil in the field. The specific surface area of the three activated carbons was MICAC>MECAC≥MACAC, and the concentrations of Cd(Ⅱ) and Pb(Ⅱ) in the leachate were reduced to 0.18~0.21 mg/L and 0.063~0.067 mg/L, respectively, after treatment with the three activated carbons. MACAC>CK;the Cd(Ⅱ) and Pb(Ⅱ) contents of MICAC-treated soil decreased by 78.57% and 80.57%, respectively, compared with the control soil at 90 d of in situ restoration in the field. The appropriate addition of 3% MECAC could effectively adsorb Cd(Ⅱ) and Pb(Ⅱ) from the soil.