Investigation on the mechanism of intermittent stirring on the remediation of chromium-containing soil by digestate coupled with ferrous sulfate
The effect of intermittent stirring on the remediation of Cr(Ⅵ)-containing soil via digestate coupled with ferrous sulfate was investigated.Speciation changes of chromium(Cr),sulfur(S)and iron(Fe),during the process were examined through X-ray Photoelectron Spectroscopy(XPS).Finally,complemented by microbial community analysis,the mechanism was elucidated.The results indicated that intermittent stirring significantly accelerated the reaction compared to static incubation.Non-detectable Cr(Ⅵ)in soil with initial Cr(Ⅵ)content of 3000mg/kg could be achieved within 2 days.The sulfate reduction was higher under intermittent stirring,accompanied with an increase of S2-content.Microbial community analysis showed that Cr(Ⅵ)-tolerant bacteria was activated after intermittent stirring treatment with a higher relative abundance of chromium-reducing and sulfate-reducing bacteria.Overall,intermittent stirring enhances Cr(Ⅵ)reduction efficiency,promoted sulfate reduction,and positively impacts microbial community structure,offering a promising approach for the low-carbon and efficient treatment of Cr(Ⅵ)-contaminated sites.
digestatesoilintermittent stirringCr(Ⅵ)reductionmicrobial community structure
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