SPECIFIC SELECTION OF FILLERS OF SUBSURFACE FLOW WETLAND AND THE REMOVAL EFFECT OF PO43--P
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摘要: 为解决中国西部农村生活污水的面源污染问题,采用吸附动力学和热力学试验,测定了6种天然和非天然潜流湿地填料吸附水中PO43--P的特性。结果表明:填料的吸附平衡时间均为24 h;对PO43--P的动力学吸附过程符合Elovich模型;温度为15~35℃时,砾石、混凝土、红砖、瓷砖和生物炭对PO43--P的平衡浓度为40 mg/L;砾石和生物炭对PO43--P的吸附过程符合Langmuir模型;混凝土、瓷砖、红砖和无烟煤对PO43--P的吸附过程符合Freundlich模型;吸附过程主要以物理吸附为主且吸热,PO43--P在填料中的吸附为焓推动作用,均不属于自发过程;在24 h时,混凝土对PO43--P的去除率为73.45%;因此,混凝土对PO43--P吸附效果最佳,更适宜作湿地填料。Abstract: In order to solve the problem of non-point source pollution of domestic sewage in rural area of western China, adsorption kinetics and thermodynamics tests were carried out to determine the adsorption characteristics of PO43--P in 6 kinds of natural and artificial subsurface flow wetland fillers. The results showed that the adsorption equilibrium time of the fillers were 24 h, and the kinetic adsorption process of PO43--P was in accordance with the Elovich model. The equilibrium concentration of gravel, concrete, red tile, ceramic tile and biochar to PO43--P were 40 mg/L, when the temperatures were in 15~35 ℃. The adsorption process of PO43--P to gravel and biochar accorded with Langmuir model, and that of concrete, ceramic tile, red brick and anthracite accorded with Freundlich model. The adsorption process was mainly based on physical adsorption and heat absorption. The adsorption of PO43--P in the packing was not a self-development process. At 24 h, the removal rate of PO43--P by concrete was 73.45%. Therefore, concrete had the best adsorption effect on PO43--P and was proved to be more suitable for wetland filling.
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