摘要:
对冶金工业园周边直排水域底泥的重金属污染进行研究,结果表明,底泥中Cr、Ni的含量分别为9800 μg/g、1400 μg/g,分别达到中国湖泊底泥重金属含量背景值的145.08倍和26.41倍.厌氧条件下,底泥中Cr、Ni向上覆水体的释放量分别为491.9 μg/m2、807.3μg/m2;转为好氧条件后,相应的释放量分别为370.8 μg/m2、475.5 μg/m2.厌氧条件下,底泥中重金属可交换态和氧化结合态所占总量的比例增加,泥/水界面Eh下降,pH值降低,促进了底泥中重金属向上覆水的释放.底泥中Cr、Ni生物有效态含量占总量的比例(B/T)分别为2.08%、19.26%.根据研究,实际工程中,建议增加泥/水界面pH值、人工曝气、设置植物浮床、设置微生物活性覆盖层等,抑制底泥中重金属向上覆水的释放.
关键词:
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底泥
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重金属
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释放量
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厌氧
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好氧
Abstract:
The pollution of heavy metals in the water sediment surrounding the Metallurgical Industrial Park of straight row was studied in this article.The results showed that the content of Cr and Ni in sediment were 9800 μg/ g and 1400 μg/g,and respectively reached 145.08 and 26.41 times as much as the heavy metal content of background values in Chinese lake sediment.Under anaerobic conditions,the release amount of Cr and Ni upward overlying water in sediment were 491.9 μg/m2 and 807.3 μg/m2;and the corresponding release were 370.8 μg/m2 and 475.5 μg/m2 after changing to aerobic condition.Under anaerobic conditions,the increasing proportion of the exchangeable state and oxidation bound of heavy metals in sediment,and the decreasing of Eh and pH value,improved the release of heavy metal in sediment to overlying water.The B/T of Cr and Ni in sediment were 2.08% and 19.26%,respectively.In practical project,increasing the pH of sediment/water interface,artificial aeration,planting and the setting of active microbial cover etc.,can inhibit the release of heavy metals in sediment.
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