| 粉细砂水敏性试验研究 |
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| 引用本文： | 韩志勇,郑西来,陈继红,杨洮.粉细砂水敏性试验研究[J].水科学进展,2008,19(5):630-634. |
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| 作者姓名： | 韩志勇 郑西来 陈继红 杨洮 |
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| 作者单位： | 1.中国海洋大学环境科学与工程学院, 山东青岛 266003; |
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| 摘 要： | 通过室内水平砂柱内的咸淡水驱替试验,以高岭土、伊利石和蒙脱石、二价汞离子(Hg2+)和苯酚(C6H5OH)为例,对粉细砂的水敏性特征进行了研究。结果表明:高岭土和伊利石含量对粉细砂水敏性的影响不大,即使含量达到10%(质量比),渗透系数也仅下降1个数量级,而当蒙脱石含量为3%(质量比)时,砂柱渗透系数下降已经超过2个数量级,含量超过4%(质量比)时,水流已经无法通过;在高速水流剪切力作用下,31.68%二价汞离子(Hg2+)和55.71%的苯酚能够被有效去除,而水敏性过程中的颗粒释放与迁移作用能够将绝大部分残余的二价汞离子(67.55%)和苯酚(43.43%)挟带出粉细砂柱。单纯的水力作用对两种污染物的去除率差别较大,原因是砂柱中粘土颗粒表面带有负电荷,使得带正电的二价汞离子(Hg2+)大量被吸附,导致其滞留于砂柱之中的比例大于苯酚。故利用粉细砂的水敏性特征可在含水砂层中建立防渗帷幕、去除重金属和有机污染物。
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| 关 键 词： | 粉细砂 水敏性 颗粒释放 渗透系数 试验研究 |
| 收稿时间： | 2007-07-09 |
Experimental study on the water sensitivity of the powder-silver sand |
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| HAN Zhi-yong,ZHENG Xi-lai,CHEN Ji-hong,YANG Tao.Experimental study on the water sensitivity of the powder-silver sand[J].Advances in Water Science,2008,19(5):630-634. |
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| Authors: | HAN Zhi-yong ZHENG Xi-lai CHEN Ji-hong YANG Tao |
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| Institution: | 1.Institute of Environment Science and Engineering, Ocean University of China, Qingdao 266003, China;2.College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China |
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| Abstract: | With the laboratory experiments of the saltwater and the freshwater replacing each other in the level sand-column,and taking the kaolin,illite,smectite,bivalent mercury ion (Hg2+) and the phenol (C6H5OH) as the examples,this article studies the water sensitivity characters of the powder-silver sand.The results show that the influence of the content of the kaolin and illite on the water sensitivity of the powder-silver sand is very slight,which results in the descense of only one grade even the content reaching 10%(weight ratio); but for the smectite,it causes the hydraulic conductivity descending sharply by above-grades when its content reaches 3% (weight ratio),and without water flowing through the sand columns at 4% (weight ratio).With the effect of the shearing force from high speed fluid,the removing rate of Hg2+ ion and phenol (C6H5OH) is 31.68% and 55.71% respectively.And the remnants can be hold out of the powder-silver sand columnswith the particle's release and migration in water sensitivity process.The reason for the obvious difference between removing rates of two kinds of pollutants is that there are many negative charges on the particles surface which absorb the bivalent mercury ion (Hg2+) which makes its resorting rate is higher than the phenol (C6H5OH).So,we can make good use of the water sensitivity character of the powder-silver sand to build the impenetrable purdah and remove pollutions of the heavy metals and organic pollutants in the sand aquifer. |
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