This study investigates the effects of various materials,including municipal sludge,en-zymes,Paebubacillus sp.A9,and iron-carbon micro-electrolysis fillers,on the speciation of chromi-um(Cr)in contaminated soil.The results indicate that the passivation effect of iron-carbon micro-electrolysis fillers on Cr is enhanced with increasing dosage and decreasing particle size.The activa-tion effects of enzymes,Paebubacillus sp.A9,and municipal sludge decrease in that order and exhib-it a dose-dependent relationship:at optimal application doses,the weak acid-extractable Cr increased by 22%,14%,and 9%,respectively,compared to the control group.One-time applications of enzymes and Paebubacillus sp.A9 yielded better activation effects than multiple applications,resulting in in-creases of 17%and 5%in weak acid-extractable Cr,respectively.Furthermore,the combined use of enzyme activation and iron-carbon micro-electrolysis passivation successfully"stored"a portion of the activated bioavailable Cr in its oxidizable form,thereby mitigating leaching risks.This synergis-tic approach of activation and passivation materials provides new insights for subsequent phytoreme-diation and comprehensive management of Cr-contaminated soils.
heavy metal pollutionactivated materialpassivating materialactivation-passivation material combination
维普
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