四种填料对总磷的静态吸附试验研究

填料是人工湿地除磷的重要组成，不同填料由于其性质不同其对磷的吸附效果也不同。砾石、石英砂、陶粒、炉渣是江西地区较常见的基质，试验分析了四种填料对磷的静态吸附等温线方程、静态吸附动力学模型及对不同浓度的磷的静态吸附效果比较，结果发现：四种填料对TP的静态吸附均能较好的用Langmuir吸附等温式和Freundlich吸附等温式描述，四种填料中炉渣对TP静态吸附性能最好，其次为陶粒、石英砂、砾石。用一级动力学方程能较好的模拟四种填料的静态吸附过程，相关系数均达到0．9以上，砾石、石英砂、陶粒、炉渣对TP的降解常数分别为0．0012，0．0015，0．0019，0．0015；随溶液中TP浓度增加四种填料的吸附量增加，同等条件下，四种填料对污水中TP的静态吸附量关系为陶粒〉炉渣〉石英砂〉砾石。

Study on Static Absorption of Total Phosphorus in Four Matrixs

Matrix is an important mechanism of phosphorus removal in the artificial wetland. The absorption effect of phosphorus of different matrixes varies greatly because of their different characters. Gravel, quartz sand, ceramsite and slag are common in Jiangxi. In these four matrixes, static absorption isotherm equatiom, absorption kinetic models about phosphorus and the absorption effects of phosphorus in different concentrations are analyzed. The results are that the absorption effect of phosphorus of four matrixes can be better described with Langmuir and Freundlich absorption isotherm equations. Slag is the most effective TP absorbency of the four matrixes,followed by ceramsite, quartz sand, gravel, h can simulate the processes of static absorption of phosphorus of four matrixes by the first kinetic models,and the correlation coefficient is over 0.9. Degradation factors of TP of gravel, quartz sand, ceramsite and slag are respectively 0.0012,0.0015,0.0019,and 0.0015.More TP is absorbed by the four matrixes at a higher TP concentration. Under the same conditions, ceramsite has a best absorbent ability among the four matrixes followed by slag, quartz sand, gravel.