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| 基于EK−PRB修复镉污染土壤的微生物优化技术 |
| Microbial optimization technology for electro-kinetics coupling with permeable reactive barrier-based remediation of cadmium-contaminated soil |
| 投稿时间：2022-09-19 |
| DOI：10.13259/j.cnki.eri.2023.03.001 |
| 中文关键词: 电动修复|可渗透反应墙（PRB）|微生物|重金属 |
| 英文关键词:electrokinetic remediation|permeable reactive barrier|microorganisms|heavy metals |
| 基金项目:上海市自然科学基金资助项目(18ZR1426100)；上海理工大学科技发展项目(2018KJFZ117) |
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| 中文摘要: |
| 采用电动−可渗透反应墙（EK−PRB）联合微生物优化技术，研究其对Cd污染土壤修复效果的影响。利用固定化微生物技术，制备粉煤灰−酵母菌小球、壳聚糖−酵母菌小球和生物炭−酵母菌小球，并对比制备的PRB小球和单一的PRB材料（粉煤灰、生物炭、壳聚糖）对Cd去除效果的影响。结果表明，相对于单一的PRB材料，PRB小球可增加土壤中的电流和电导率，对Cd的去除率更高，但是对pH影响较小。通过对PRB材料进行表征分析，证实了其对Cd去除效果有一定影响。考虑到经济成本与修复效果，选择电压梯度为2.5 V·cm−1，PRB材料为粉煤灰−酵母菌小球去除Cd，去除率可达53.70%。研究结果证实了固定化微生物结合EK−PRB技术的可行性以及修复优势。 |
| 英文摘要: |
| The combined influence of electro-kinetics coupling with permeable reactive barrier (EK-PRB) and microbial optimization technology on the remediation of Cd-contaminated soil was investigated. Fly ash-yeast pellets, chitosan-yeast pellets and biochar-yeast pellets were prepared. Their effect on Cd removal were compared with PRB pellets with single fly ash, biochar, and chitosan in a total of 6 tests. Results show that the PRB pellets increase the current and conductivity in the soil with higher Cd removal compared with single PRB. But they had less effect on pH. The effect of single PRB on Cd removal was confirmed by further characterization. Considering both the cost and remediation effect, the Cd removal rate of 53.70% can be achieved by the fly ash-yeast PRB pellets at the voltage gradient of 2.5 V·cm−1, which indicates the feasibility of the immobilized microorganisms combining with EK-PRB technology and their advantages of remediation. |
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