| 王小庆,陈筱艳,廉铭铭,吴明明,张驰,张哲.污泥生物炭对豫西矿区 Mo-Cd污染农田土壤的钝化与稳定性研究[J].矿产勘查,2026,17(7):1273-1283 |
| 污泥生物炭对豫西矿区 Mo-Cd污染农田土壤的钝化与稳定性研究 |
| Immobilization efficiency and stability of sludge-derived biochar in agriculutural soils co-contaminated with molybdenum and cadmium in a mining areas of Western Henan |
| 投稿时间：2025-08-18 |
| DOI：10.20008/j.kckc.202607014 |
| 中文关键词: 污泥生物炭 钝化 钼 镉 农田土壤 |
| 英文关键词: sludge-derived biochar immobilization molybdenum cadmium agricultural soil |
| 基金项目:本文受2024年度河南省地质研究院地质科技攻关项目(2024-906-XM08)、2025年度河南省地质研究院地质科技攻关项目(2025-903-XM03)联合资助。 |
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| 中文摘要: |
| 为探究污泥生物炭对钼(Mo)、镉(Cd)复合污染土壤的修复潜力，本研究选取豫西矿集区不同污染水平的土壤样品，通过室内试验研究了污泥生物炭对土壤中 Mo和 Cd的钝化效果、修复稳定性及生态安全性。结果表明，施加生物炭后，土壤 pH、总有机碳(TOC)和阳离子交换容量(CEC)均有所提升，但变化不显著。土壤中有效态 Mo和 Cd浓度在施入生物炭 3d后明显下降，第 7d基本趋于稳定，且在 60 d的钝化时间内无明显变化。生物炭显著降低了土壤中有效态 Mo(14%~35%)和有效态 Cd(25%~39%)。不同生物炭在不同污染程度土壤中表现差异明显，总体而言对 Cd的钝化效率优于 Mo，推测与其作用机制不同有关。经干湿交替与冻融循环模拟环境扰动后，钝化土壤中有效态 Mo和 Cd浓度未显著回升，表明修复效果具有良好的稳定性。小白菜发芽试验结果表明，污泥生物炭在 2%施用量下，对种子发芽无显著抑制，且各处理发芽率均达 85%以上，初步验证其生态安全性。综上，污泥生物炭可有效钝化 Mo-Cd复合污染土壤中的重金属，修复效果稳定且生态风险低，具有良好的应用前景，但对 Mo等阴离子型重金属的钝化效率仍有提升空间。 |
| 英文摘要: |
| To investigate the potential of sludge-derived biochar for remediating co-contaminated soil with mo-lybdenum (Mo) and cadmium (Cd), soil samples with varying pollution levels from a mining area in western HenanProvince were collected and used in laboratory experiments. Laboratory experiments were conducted to evaluate theimmobilization efficiency, stability, and ecological safety of applying-sludge biochar. Results showed that biocharaddition increased soil pH, total organic carbon (TOC), and cation exchange capacity (CEC), although these changeswere not statistically significant. The concentrations of bioavailable Mo and Cd decreased within 3 days after bio-char application, stabilized by day 7, and remained unchanged throughout the 60-day incubation period. The bio-char significantly reduced bioavailable Mo by 14% to 35% and Cd by 25% to 39%. The immobilization performanceof varied among biochars and across soils with different contamination levels. Overall, the efficiency of Cd immobili-zation was higher than that of Mo, likely attributable to differences in their underlying immobilization mechanisms.No significant rebound in bioavailable Mo or Cd occurred after simulated wet-dry and freeze-thaw cycles, demon-strating the long-term stability of biochar-based immobilization. A germination test using pakchoi (Brassica rapachinensis) revealed that biochar applied at a 2% rate did not significantly inhibit seed germination, with germinationrates exceeding 85% across all treatments, indicating a low immediate ecotoxicological risk. In conclusion, sludge-derived biochar effectively immobilizes Mo and Cd in co-contaminated soils, providing a stable and environmen-tally safe remediation strategy with promising application potential. However, further improvements are needed toenhance the immobilization efficiency of anionic heavy metals such as Mo. |
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