Abstract: The four static experiments selected fine sand, silt sand, clay and soil were carried out to investigate the temporal changing trend of pH, NO₃-N, NH₄-N, organic matter, bioactivity and its' correlation in different lithology landfill leachate contaminated sites. Experimental results indicated that the order of the four media for pH was fine sand >silt sand >clay >soil, for ammonia nitrogen,organic matter and bioactivity was soil >clay >silty sand >fine sand, but for nitrate nitrogen, the order in the initial phase was soil >clay > silt sand >fine sand, in the metaphase was fine sand > silt sand >clay >soil, but at the end of the experiment was soil >fine sand > silt sand >clay. In addition, SPSS was used to analyze the general temporal correlation of the indexes in the four media. Results showed that there existed a good negative correlation between pH and organic matter, and the correlation coefficient was -0.649. However, there existed a good positive correlation between organic matter and bioactivity, and the correlation coefficient was 0.640. There existed a good positive correlation between ammonia nitrogen and bioactivity, and the correlation coefficient was 0.757.

Key words: lithology, landfill leachate, contaminated site, contamintion, attenuation