城市生活污泥和矿化垃圾中氮磷淋失的模拟研究

通过模拟土柱实验,分析了城市生活污泥和矿化垃圾中氮磷的迁移对地下水的影响以及矿化垃圾对氮磷的去除特性.测定项目包括总磷、总氮、硝态氮、pH和电导率(EC).结果表明:施用污泥和矿化垃圾后淋滤液的pH呈下降趋势;EC和总氮都有显著增加;硝态氮增加特别明显,容易造成地下水污染;总磷变化不大,污染地下水的可能性较小.矿化垃圾对氮的去除作用不明显,反而增加了淋滤液中的氮素含量,但对磷的去除效果明显.因此,在利用矿化垃圾取代土壤时,应注意矿化垃圾中氮特别是硝态氮的污染.

Simulation on the movement of nitrogen and phosphorus in living sewage sludge from municipal and aged refuse

A simulated column experiment was performed to analyze the effects of nitrogen and phosphorus from living sewage sludge of municipal and aged refuse movement on the underground water, and on the removal of nitrogen and phosphorus by aged refuse. Several parameters such as the total phosphorus, total nitrogen, nitrate, pH value and EC were determined. The results showed that the pH value had the tendency to decrease, whereas the total nitrogen and EC value increase apparently while the sewage sludge and aged refuse being used in soils. In addition, the nitrate species were found to increase significantly and to induce the pollution of the underground water, while the minor changes for phosphorus species showed the possibility to cause the pollution of the underground water was pretty low. It was also found that the using of aged refuse had minor and some influence on the removal of nitrogen and phosphorus species from leachates respectively, which, however, increased the nitrogen content in the leachates. It is suggested that great attention should be paid to the pollution by nitrogen especially nitrate species when the aged refuse was utilized to replace soils.