卫生填埋体填土层净化机理试验研究

针对填土层在填埋体中的作用 ,以成都市万兴废弃物处置场为例 ,通过土柱试验着重研究了填土层对垃圾淋滤液的净化机理。试验证明在相同的干密度下含水率大的土层对阳离子净化效果要好 ;淋滤引起土层的渗透系数明显增大 ,变化范围在 0 .5～ 1个数量级 ;典型的一价离子NH+4 (和Cl-)的净化规律可用指数函数表征。

Contaminant resistant mechanism of filledearth layer in waste disposal site

In the waste filling, it is extremely important that the earthfill retards the percolation of the waste leached solution. On the basis of a large number of test data, the paper presents the decontamination mechanism and laws of ions frequently appearing in leachate. The results of earthcolumn tests indicate that the structure of layers has effects on the transporting and cleaning of ions in different degree with different ions; that due to exchange of adsorption with bivalent cation (Ca 2+ ,Mg 2+ )in place of monovalent ions the permeability increases 5～10 times; that potential function of typical monovalent ions (NH 4 +,Cl -) is exponential.