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| Investigation on the mechanism of intermittent stirring on the remediation of chromium-containing soil by digestate coupled with ferrous sulfate |
| XIAN Ying-zhuo1, SHA Fu-jian2, QIAN Yu-long3, LI Xiao-cai4, LI Rong-qiang1, SUN Ying-jie1, ZHANG Da-lei1, ZHAO Jian-wei1 |
1. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China;
2. The Second Hydrogeology and Engineering Geological Team of Shandong Provincial Geological Survey Bureau (Shandong Lubei Geological Engineering Investigation Institute), Dezhou 253072, China;
3. Rizhao Service Center of Environment Protection, Rizhao 276827, China;
4. Service Centre for Construction Project Environmental Assessment of Shandong, Jinan 250012, China |
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Abstract 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.
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Received: 18 March 2024
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