人工湿地填料的磷吸附特性研究

Phosphorus Adsorption Characteristics of Four Materials for Use as Substrates in Constructed Wetland

选取太湖流域常见的碎石、炉渣、石膏和紫砂作为人工湿地基质,研究它们对磷的吸附特性.结果表明,这4种基质对磷的吸附符合Langmuir方程,对磷的吸附量为石膏>碎石>炉渣>紫砂.这4种基质吸附的磷主要以Ca-P的形态存在.在太湖流域,碎石和石膏可单独作为人工湿地填料,炉渣pH较高,不宜单独使用;紫砂吸附性能较差,宜和其他3种填料混合使用。

Experiments were carried out to investigate the phosphorus adsorption characteristics of crushed stone, furnace slag, gypsum and purple sand to be used as substrates in constructed wetland in the Taihu watershed. The results demonstrated that the phosphorus adsorption of the four substrates fit the Langmuir equation well. The phosphorus adsorption capacity of the four substrates were gypsum 〉 crushed stone 〉 furnace slag 〉 purple sand. Ca-P was the main form of the adsorbed phosphorus. In the Taihu watershed, crushed stone and gypsum could be used as substrates in constructed wetland, but furnace slag was unfitable to be used alone because of its high alkalinity; purple sand was also unfitable to be used alone because of its poor phosphorus adsorption capacity. The mixture of purple sand and the other materials of high phosphorus adsorption capacity could be used as substrate in constructed wetland.