鄱阳湖湿地土壤对氨氮的吸附性能研究

Study on Wetland Soil Adsorption of Ammonia Nitrogen in Poyang Lake

主要研究鄱阳湖湿地土壤对氨氮的吸附性能。该湿地土壤对氨氮的吸附用Freundlich方程拟合效果较好，且该5个剖面层的n值均接近于1，故该土样对NH4＋-N吸附基本符合线性分配过程；在吸附动力学过程中，24 h为此土壤对NH4＋-N的吸附平衡时间，伪二级动力学方程能更有效地模拟土样对NH4＋-N的动力学吸附，5个剖面层的平衡吸附量qe的大小关系为0～10＞10～20＞20～30＞30～40＞40～50 cm，且土样对NH4＋-N的平衡吸附量与其中所含有机质呈正相关关系；还考察了pH、温度、固液比对氨氮吸附的影响，结果是pH增大、温度下降、固液比的增大均会促进吸附反应的进行。

This paper mainly studies the Poyang lake wetland soil adsorption of ammonia nitrogen. It maintains that the wetland soil adsorption of ammonia nitrogen with the Freundlich equation fitting effect is good, and the five section layers＇n values are close to 1, so the soil samples of ammonia nitrogen adsorption conforms to the basic linear distribution process;In the process of adsorption kinetics, the soil adsorption equilibrium time of ammonia nitrogen is 24 h, and the pseudo secondary dynamics equation can effectively simulate the dynamics of soil sam-ples of ammonia nitrogen adsorption with the equilibrium adsorption quantities from the five section layers being 0～10〉10～20〉20～30〉30～40〉40～50 cm, and the equilibrium adsorption of ammonia nitrogen is positively contain-ing organic matters. The paper also examines effects of the pH, temperature and solid-liquid ratio on the absorp-tion of ammonia nitrogen. It finds out that increasing the pH, reducing the temperature and raising the solid-liquid ratio can promote the adsorption reaction.