Abstract: A soil column is constructed to investigate temporal and spatial transportation and transformation rule of landfill leachate pollutants in pollution plume, and to study the biogeochemistry mechanisms of the pollutants attenuation in the landfill leachate plumes. Experimental results indicated that in the pollution plume of landfill leachate, the concentration of TOC decreased with the distance, and its removal efficiency was up to 99.87% in the initial phase. The concentration of TOC increased with time and its removal efficiency in the final phase is only 55.21%. TOC is easy to transport. The spatial change of ammonium was familiar with that of TOC in the initial phase; its removal efficiency could be up to 99.58%. However, in the final phase, the concentration of ammonium increased first and then declined with the distance. The concentration of ammonium increased with time, but its transport ability is less than that of TOC. The removal efficiency of ammonium in the final phase reached 90.12%.

Key words: landfill leachate, pollution plume, pollutants, attenuation, transport