人工湿地不同基质磷吸附性能试验研究

Study on Phosphorus Adsorption Performance of Different Substrates Used in Constructed Wetland

针对近年来大量含磷废水排入水体所造成的污染问题,研究了沙、碎石、土、灰渣4种人工湿地基质对废水中磷的吸附效果,考察其吸附动力学性能和解吸性能,进行等温吸附试验。结果表明,4种基质中土的吸附效果最好,12h时吸附量可达489.2mg·g-1;土的等温吸附可以用弗里德里希吸附等温式和兰缪尔吸附等温式表示,其相关性系数分别为0.990和0.9529;解吸试验表明,吸附饱和后的土的解吸效果较差,12h后磷的解吸率为16.8%。以上结果可以为实际的工业应用提供参考。

In recent years a large number of wastewater containing phosphorus has been discharged into water bodies and has caused serious water pollution. In this paper, four kinds of substrate materials in constructed wetland including sand, gravel, soil and coal burn slag, were used to investigate the adsorption performance to phosphorus. Adsorption dynamics experiment, isothermal adsorption experiment and desorption experiment were conducted. The results showed that soil had good phosphorus removal effect with the ad- sorptive amount of 489.2 mg·kg^-1 at the end of 12 h. The data obtained in the experiment were fit to both Freundlish and Langmuir ad3orption isothermal equations with the correlation coefficients of 0.990 and 0.952 9 respectively. Desorption experiment indicated that the desorption efficiency of soll was 16.8% at the end of 12 h. These results could provide reference for practical engineering.