Liu Qian-Jun, Li Xiang, Zhou Yang-Mei, Tang Jie-Peng, Lin Qin-Tie, Yao Kun
Guangdong Industrial Contaminated Site Remediation Technology and Equipment, Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Huan Jing Ke Xue. 2019 Dec 8;40(12):5623-5628. doi: 10.13227/j.hjkx.201906152.
The Pearl River Delta region is the major economic zone of the Greater Bay Area:it presents a large number of industrial-mining enterprises and is interested by severe heavy metal pollution (mainly caused by Pb and Cd). The research and development of safe and efficient heavy metal remediation materials and technologies is fundamental in order to guarantee regional environmental quality and habitat safety. Goethite-fulvic acid composites were prepared using goethite minerals present in the red soils of the Pearl River Delta region by passivation repair, and were applied to immobilize Pb and Cd in a co-contaminated soil. The results showed that a higher ratio of fulvic acid in the composites enhanced the immobilization effect on Pb and Cd:the immobilization efficiency (IE) of Pb and Cd increased with the passivation time, and then stabilized. Additionally, the exchangeable and carbonate-bound fractions of Pb and Cd in the soil decreased, while the Fe-Mn oxide-bound and residual fractions increased. The cation exchange capacity (CEC), as well as the available K and NH-N in the soil increased after the application of the composite materials. We conclude that goethite-fulvic acid composites can be effectively applied to the remediation of Pb-Cd contaminated soil.
这里有大量工矿企业，且受到严重的重金属污染（主要由铅和镉造成）。研发安全高效的重金属修复材料和技术对于保障区域环境质量和栖息地安全至关重要。利用珠江三角洲地区红壤中存在的针铁矿矿物通过钝化修复制备了针铁矿-富里酸复合材料，并将其应用于固定复合污染土壤中的铅和镉。结果表明，复合材料中较高比例的富里酸增强了对铅和镉的固定效果：铅和镉的固定效率（IE）随钝化时间增加，然后趋于稳定。此外，土壤中铅和镉的可交换态和碳酸盐结合态部分减少，而铁锰氧化物结合态和残留态部分增加。施用复合材料后，土壤的阳离子交换容量（CEC）以及速效钾和铵态氮增加。我们得出结论，针铁矿-富里酸复合材料可有效应用于铅-镉污染土壤的修复。
