磁性固体螯合材料修复农田镉污染土壤研究

Remediation of Cadmium-Polluted Farmland Soils by Magnetic Solid Chelator

为了完善农田耕地土壤Cd污染"磁性固体螯合材料-农机磁选移除"技术,获取相关技术参数,文章采用室内盆栽模拟方法,研究了投料后磁性固体螯合材料在土壤耕层垂直分布以及基于移除效果的最佳材料投加量。结果表明:磁性固体螯合材料施入水田土壤后,经搅拌后,在耕层是均匀分布;固体螯合材料投加量为0.40%时,土壤总Cd、DTPA-Cd和HCl-Cd移除率达到最大,增加投加量土壤Cd移除率趋于稳定。因此,设计的回收机械应考虑在整个耕层回收材料,0.4%的最佳螯合材料投加量以及该投加量是否有利于磁选回收,还需要农机在大田实验验证。

In order to improve the ＂magnetic solid chelator（MSC）-agricultural machinery magnetic separation＂technology involving adding of MSC into soil for remediation of Cd-polluted farmland soil, the analogy procedure by means of pot experiment was conducted to characterize MSC vertical distribution in the soil and determine the optimum dosage of MSC. The experimental result indicated that the MSC could be uniformly distributed in the soil after being mixed; as MSC dosing amount was 0.40%, removal rates of total Cd, DTPA-Cd and HCl-Cd from soil reached the maximum, and Cd removal rate tended to be steady as the dosing amount of MSC increased.