| 水库底泥中镉释放影响因素及释放规律试验研究 |
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| 引用本文： | 刘秀平,金腊华,王立立,汪梅.水库底泥中镉释放影响因素及释放规律试验研究[J].安徽农业科学,2008,36(28). |
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| 作者姓名： | 刘秀平 金腊华 王立立 汪梅 |
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| 作者单位： | 暨南大学环境工程系,广东广州,510632 |
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| 摘 要： | 目的]研究水库底泥中镉的释放影响因素和规律。方法]通过模拟试验,研究水动力等物理因素及水环境化学条件对珠江某水库底泥中Cd释放量的影响,探讨底泥中Cd的释放规律。结果]在相同水深处,底泥中Cd释放量随Cd污染浓度的增大而逐渐增加。随着水深的增加,不同Cd污染浓度底泥中Cd释放量增大。随着流速的增大,底泥中Cd释放量增加,且释放量较大。0.115 m/s流速下的Cd释放量几乎是0.105 m/s流速下的1倍。随着泥沙粒径的增大,底泥中Cd释放量增加。Elovich方程等6个方程可较好地描述该水库底泥中镉释放的动力学规律,且二级反应动力学方程的拟合效果最好。结论]水库底泥中Cd释放量随Cd污染程度和流速的增大而增加。
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| 关 键 词： | 底泥 镉 重金属释放 污染预测 |
Experimental Studies on Influencing Factors and Releasing Rules of Cadmium Released from Reservoir Bed Sediment |
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| Abstract: | Objective] The aim was to study the influencing factors and rules of Cadmium(Cd) released from reservoir bed sediment.Method] The influences of physical factors such as hydrodynamic force and chemical conditions of water environment on the release amount of Cd in certain reservoir bed sediment of Zhujiang were studied by simulation test and the release rules of Cd in sediment were discussed.Result] The release amount of Cd in sediment was increased gradually with the increase of Cd polluting concn.at the same water depth.The release amount of Cd in sediment with different Cd polluting concentrations was increased with the increase of water depth.The release amount of Cd in sediment was increased with the increase of flow rate and the release amount was more.The release amount of Cd at the flow rate of 0.115 m/s was nearly one time more than that at the flow rate of 0.105 m/s.The release amount of Cd in sediment was increased with the increase of sediment grain size.6 equations such as Elovich equation could describe the dynamic rule of Cd released from reservoir bed sediment better and the fitting effect of second-order reaction kinetics was best.Conclusion] The release amount of Cd in reservoir bed sediment was increased with the increase of the pollution degree and the flow rate. |
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| Keywords: | Sediment Cadmium(Cd) Heavy metal release Pollution forecast |
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