关键词: 包气带, 氮素, 去除率, 土柱, 防污性能

Abstract:

The soil of unsaturated zone acts as a natural protector to the groundwater and it plays an important role in blocking the pollutants. Antifouling property in prevention nitrogen from polluting groundwater has been investigated through soil column leaching experiments. Three different sources-distilled water, recycled water and river water are used in the test. It is demonstrated that the soil used in the test has a strong capability in prevention nitrogen from polluting groundwater and the denitrification shows two different stages-stable and vola-tility dropped wherein the stable phase is the critical stage to compute the capacity. This papers presented a formula which considered the interval removal. The water sources have a significant effect on the flow rate and adsorption effects. The capability is affected by temperature changes. The column showed a strong ability to remove nitrogen when the temperature reached about 15 ℃.

Key words: vadose zone, nitrogen, removal rate, soil column, antifouling property