不同基质磷吸附性能及其在表流人工湿地中应用

摘要

选用煤渣和沙子两种基质进行等温吸附和吸附动力学试验，并结合表面流人工湿地处理含磷废水的效果，研究了煤渣和沙子对磷的吸附特性以及两种基质在表面流湿地中的除磷效果。结果表明：吸附实验中， Freundlich和Langmuir方程均能较好地拟合两种基质对磷的吸附特性，一级反应动力学方程能够很好拟合沙子的吸附动力学曲线，煤渣的动力学拟合情况较差。以煤渣为基质的表面流人工湿地对磷的平均去除率（35.79%）低于以沙子为基质的表面流人工湿地对磷的平均去除率（48.25%），并且沙子湿地除磷的稳定性好于煤渣湿地。%Tests on isothermal adsorption and adsorption kinetics have been conducted with two kinds of substrates:coal cinder and sands. Combined with the effect of surface flow constructed wetland on the treatment of phosphorus-containing wastewater,the adsorbing capacity of coal cinder and sands for phosphorus,and the phosphorus removing effect of the two kinds of substrates in surface flow constructed wetland are studied. The results show that based on ad-sorption tests,both Freundlich and Langmuir equation are well fitted for the adsorption characteristics of the two kinds of substrates for phosphorus. The first-order kinetics equation can be well fitted for the adsorption kinetic curve of sands,but not so well fitted for that of coal cinder. The phosphorus removing rate by coal cinder-substrate surface flow constructed wetland(35.79%) is lower than that by using sand-substrate surface flow con-structed wetland(48.25%). Furthermore,the stability of phosphorus removing capacity of sands wetland is better than that of coal cinder wetland.