【作者】 郑燊燊；

【导师】 申哲民； 王文华；

【作者基本信息】 上海交通大学 ， 环境工程， 2007， 硕士

【摘要】 汞及其化合物具有很强的神经毒性和致畸作用(WHO,1990),且积累效应和遗传毒性明显,一直是国内外极为关注的优先控制污染物。我国被Hg污染的耕地面积有3.2×104公顷,每年产生污染环境的Hg达1.9×108kg。贵州省是中国乃至世界上重要的产汞地区,产汞量约占全国的70%。当地某些厂矿周边土壤或污灌农田土壤中的汞含量高达24～347mg.kg-1,甚至超过700mg.kg-1,汞污染土壤的修复已经迫在眉睫。电动修复(EK)技术是近十年来发展起来的一种污染土壤修复技术。该技术具有生态环境破坏小,速度快等优点。其影响因素包括修复过程的pH、土壤性质、待去除重金属元素的存在形态等。本论文以吸附-解吸平衡的界面迁移行为为主要机理,研究了汞在不同土壤中的解吸动力学特征及其对电动修复的影响。实验中选取贵州地区三种典型汞污染土壤即水稻土I、水稻土II、旱作土进行了汞的解吸的动力学机理及其影响因素的研究。结果显示较低的pH值、较高的温度、氧化性的环境都有利于Hg的解吸。pH每下降一个单位,水稻土I、水稻土II和旱作土的最大解吸率分别增大2.75、1.65和7.43个百分点。当Eh<406mV时,Eh值每升高1mV,水稻土I、水稻土II和旱作土的最大解吸率分别提高0.17、0.15和0.21个百分点。实验中还发更多还原

【Abstract】 As one of the prior controlled pollutants, mercury and its components concern researchers both domestic and overseas with their serious neuronal toxicity, teratogenic effect, cumulative effect and genotoxicity. It is reported that about 32 thousand hectares of arable land in China have been polluted by mercury being generated by 1.9×108 kilograms per year. Guizhou province, being considered as one of the most important mercury mine in China, even in the world, contributes 70% of the total mercury output of China. As a result, mercury content in soil nearby some of the local mercury mines or land irrigated by waste water reaches as high as 24 to 347 mg.kg-1, even over 700 mg.kg-1, which makes an enormous impact on the ecosystem and human health. Remediation of mercury pollution is becoming a more and more urgent problem that calls for public attention.In the last decades, a new soil recovery technology named electrokinetic (EK) remediation is rapidly developed, which has several evident advantages involving high efficiency and none secondary pollution. However, some factors like pH value, soil property and heavy metal speciation can significantly affect the results of EK remediation. Boundary migration caused by asorption-更多还原