【摘要】 通过砂柱的水敏感性试验,以二价汞离子(Hg2+)和苯酚(C6H5OH)为例,研究了水敏感性过程中微粒释放对重金属离子和有机污染物迁移特征的影响。试验结果表明:单一NaC l溶液淋滤Hg2+污染的砂柱,Hg2+去除率为31.68%,换蒸馏水置换NaC l溶液发生微粒释放,此过程流出Hg2+占总量的67.55%,仅有0.78%的Hg2+残留在砂柱中;同样,在苯酚的去除试验中,上述去除率分别为55.71%和43.43%,残留率为0.86%,即在水力作用和水敏性的共同作用下,砂柱中的Hg2+和苯酚几乎可以被全部去除。单纯的水力作用对两种污染物的去除率差别较大,原因是砂柱中微粒表面带有负电荷,使得带正电的Hg2+被吸附,从而大量滞留于砂柱之中。更多还原

【Abstract】 Bivalent mercury ions(Hg2+) and the phenol(C6H5OH) are used to study the influence of particle release on migration characteristics of heavy-metal ions and organic pollutants in the process of water sensitivity.The results show that the removal rate of Hg2+ is 31.68% when only the NaCl solution leaches through the sand column polluted by Hg2+.While 67.55% of the total Hg2+ are washed out with residual rate of 0.78% when distilled water replaces the NaCl solution.In a similar experiment with phenol in stead of Hg2+,the removal rates of phenol are 55.71% and 43.43% respectively with residual rate of 0.86%.It means that the Hg2+ and phenol can be almost removed completely by the co-function of hydraulic action and water sensitivity.There is a big difference between the removal rates for two pollutants by hydraulic action only due to negative charges on the surface of particles which absorb the Hg2+ to stay in the sand column.更多还原