Chapter 3 and 4 researches soil depurating function and rule to rainwater by soil columniation penetrating examination on the basis of the two former chapters . and it analyses the influence of soil structure , contamination burthen and penetrating deepness to depurating effect , and discusses contaminate cumulation and renewing ability of soil 第三章和第四章在前两章的基础上，通过土壤柱渗透试验，研究了雨水在土壤中的净化作用及其规律，分析了土壤结构、污染物负荷、渗透深度对土壤净化效果的影响，并对污染物的累积和土壤净化能力的恢复进行了探讨。
Abstract : nano tio2 was dip - coated on active air purification sieve of active carbon . the purification effect of this sieve against various polluting gases were investigated . the result showed that purification effects on h2s , nh3 , hcho , co , and toluene were notably enhanced throush degradation of pollutants by photocatalysis agent under uv irradiation , which resulted in enhanced purification ability of active carbon 文摘:采用浸涂法在活性炭空气净化网上负载纳米二氧化钛，在紫外光的照射下，净化网对一氧化碳、甲醛、硫化氢等污染物的净化能力明显增强，对比实验表明，在紫外光照射下光催化剂使被吸附的污染物发生降解反应而提高活性炭的净化能力。
Nano tio2 was dip - coated on active air purification sieve of active carbon . the purification effect of this sieve against various polluting gases were investigated . the result showed that purification effects on h2s , nh3 , hcho , co , and toluene were notably enhanced throush degradation of pollutants by photocatalysis agent under uv irradiation , which resulted in enhanced purification ability of active carbon 采用浸涂法在活性炭空气净化网上负载纳米二氧化钛，在紫外光的照射下，净化网对一氧化碳、甲醛、硫化氢等污染物的净化能力明显增强，对比实验表明，在紫外光照射下光催化剂使被吸附的污染物发生降解反应而提高活性炭的净化能力。
