地沟式污水生态处理系统中土壤及填料吸磷机理的研究

Mechanism of Removal of Phosphorus in an Under- Ground- Ditch- Pattern Sewage Zoology Treatment System

通过磷的静态和动态等温吸附试验对地沟式污水生态处理系统中土壤及填料对磷的去除机理进行研究。结果表明,贵阳本地的五种土壤和填料———黄壤、紫色土、石灰土、石灰石和粉煤灰对磷的最大吸附量各不相同,其中石灰土的吸磷能力最强,石灰石的吸磷能力最弱。在吸附反应前期,土壤及填料对磷溶液的吸附速率和吸附量都随时间增加而迅速增大;在吸附反应后期,土壤及填料对磷溶液的吸附速率和吸附量随时间增加趋于平缓。在4种动力学方程中,黄壤的动态等温吸附曲线与双常数方程的相关性最好;紫色土、石灰土和粉煤灰的动态等温吸附曲线与一级动力学方程的相关性最好;石灰石的动态等温吸附曲线与抛物线扩散方程的相关性最好。

Through phosphoric static and dynamic isothermal adsorption experiments, the mechanism of removal of phosphorus in an under- ground- ditch- pattern sewage zoology treatment system was studied in this paper. The results obtained from five soils in Guiyang regin indicated that fillings' maximal adsorbent quantity was different. It has been also discovered that calcareous soil was the biggest one in adsorbent ability on phosphor and the limestone was the smallest one. In the former reaction, the quantity and velocity of adsorption added the faster with the time increasing and added slower in the latter reaction. In the four dynamic equations, the dynamic isothermal adsorption curve for the yellow soil tally well with the two- constant rate equation; while the purple and the calcareous soil and the coal ash tally well with the first- order rate equation; while the limestone accord well with the Parabolic diffusion equation.