硫酸盐对电子垃圾拆解地底泥中重金属形态的影响
发布时间：2019-06-13 08:28
【摘要】：为研究硫酸盐对重金属形态分布的影响规律,评价不同条件下的重金属生态风险,采集广东清远某电子垃圾拆解区附近河流底泥,通过投加不同浓度硫酸盐,采用BCR四步提取法分析厌氧培养28 d期间铜、铅、锌、镉的形态变化。结果表明:灭菌条件下,重金属的形态基本保持不变;在空白条件下Cu、Pb、Zn和Cd 4种重金属由不稳定态向稳定态转化,其转化率分别是7%、5%、11%和5%,锌的变化最明显;与空白相比,硫酸盐的投加会加大这4种重金属的转化,其影响顺序为:CuCdZnPb。硫酸盐的投加可促进硫酸盐还原菌的生长,当硫酸盐浓度在286~655 mg·kg-1范围时,硫酸盐还原菌的数量随着硫酸盐浓度升高而增加。实验运行到后期,高浓度的H2S会对硫酸盐还原菌产生毒害作用,因此重金属的形态并不会一直向稳定态转化,研究结果表明,高浓度硫酸盐条件可降低重金属的迁移能力,有利于重金属污染场地的修复。
[Abstract]:In order to study the effect of sulfate on the distribution of heavy metal forms and evaluate the ecological risk of heavy metals under different conditions, the river sediment near an electronic waste dismantling area in Qingyuan, Guangdong Province was collected and the morphological changes of copper, lead, zinc and cadmium were analyzed by BCR four-step extraction with different concentrations of sulfate. The results showed that the morphology of heavy metals remained basically unchanged under sterilization conditions, and the conversion rates of Cu,Pb,Zn and Cd were 7%, 5%, 11% and 5%, respectively, and the change of zinc was the most obvious under the blank condition. Compared with the blank, the addition of sulfate would increase the transformation of these four heavy metals, and the influence order was as follows: CuCdZnPb. The addition of sulfate can promote the growth of sulfate-reducing bacteria. When the sulfate concentration is in the range of 286 鈮，
本文编号：2498398
[Abstract]:In order to study the effect of sulfate on the distribution of heavy metal forms and evaluate the ecological risk of heavy metals under different conditions, the river sediment near an electronic waste dismantling area in Qingyuan, Guangdong Province was collected and the morphological changes of copper, lead, zinc and cadmium were analyzed by BCR four-step extraction with different concentrations of sulfate. The results showed that the morphology of heavy metals remained basically unchanged under sterilization conditions, and the conversion rates of Cu,Pb,Zn and Cd were 7%, 5%, 11% and 5%, respectively, and the change of zinc was the most obvious under the blank condition. Compared with the blank, the addition of sulfate would increase the transformation of these four heavy metals, and the influence order was as follows: CuCdZnPb. The addition of sulfate can promote the growth of sulfate-reducing bacteria. When the sulfate concentration is in the range of 286 鈮，
本文编号：2498398
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