多层改性滤料对城市雨水的净化与节流作用研究
[Abstract]:On the one hand, the acceleration of urbanization reduces the seepage area, and when the rainfall is large in a short time, it is very easy to cause urban waterlogging disaster; on the other hand, a large number of polluted rainwater runoff enters the water body around the city. Water quality is impacted and water resources are polluted. Many cities in China are in short supply of water resources because of rainwater problems. It is of great significance to treat runoff rainwater by infiltration, storage, treatment and drainage. It can effectively intercept and absorb pollutants in rainwater runoff, at the same time, the filter layer will delay the generation time of surface runoff, reduce the amount of runoff, thus play a "seepage, storage, treatment, drainage" role, reduce the pollution of rainwater to water sources and urban flood disaster. Therefore, the study of different combination of leachate and natural matrix soil infiltration system. The experimental water is used to simulate the actual urban rainwater runoff. According to the collection, determination and analysis of the three actual runoff rainwater, the range of COD, ammonia nitrogen, total nitrogen, total phosphorus and turbidity in the artificial water distribution is finally determined. Literature shows that organic matter, ammonia nitrogen, total nitrogen, turbidity and so on are higher in the actual rainwater runoff, and the pollutant concentration in the road surface and roof runoff is generally higher in the early 20-30 minutes of rainfall. With the increase of rainfall duration, the pollutant concentration decreases rapidly in the middle and later periods of rainfall, indicating that the scouring effect occurs. In order to investigate the removal capacity of COD and ammonia nitrogen from runoff by different kinds of filter media, 0.5-1 mm quartz sand, 1-2 mm quartz sand, 0.5-1 mm zeolite, 1-2 mm zeolite, 1-2 mm ceramsite, 2-4 mm ceramsite and 0.5-1 mm broken brick were selected as the alternative filters for static adsorption experiments. The results of static adsorption showed that 1~2 mm ceramsite had the best adsorption effect on COD, zeolite with adsorption capacity of 0.369 mg g 1,0.5~1 mm had the best adsorption effect on ammonia nitrogen and adsorption capacity of 0.066 mg g 1. Particles and quartz sand are used as filters of the leaching system in this study for subsequent modification and dynamic tests. Three filters selected from static adsorption experiments are coated with ferric oxide and modified with sodium chloride respectively and used for dynamic experiments. The surface of the modified quartz sand was found to be composed of hematite (Fe2O3) and magnetite (Fe3O4), and ceramsite (gamma-Fe2O3) and goethite (alpha-FeO (OH). Zeolite was increased. The static experiment results show that the modified ceramsite has the best adsorption effect on COD, and the equilibrium adsorption capacity is 0.37 mg g 1, which is 7.15% higher than that of the unmodified zeolite. The adsorption capacity of the modified zeolite is 0.074 mg g 1, which is 12.12% higher than that of the unmodified zeolite. The artificial rainfall dynamic experiment was carried out by combining the modified filter with the matrix soil. The results showed that the pollutant concentration in the final effluent of the filter group was lower than that of the pure soil control group when the single filter was combined with the matrix soil. The average effluent concentration was 15.12 mg L-1. Modified zeolite had the best removal effect on ammonia nitrogen, and the average effluent concentration was 0.48 mg L-1. When combined with matrix soil, four different kinds of filter materials, particle size and filter thickness were compared. The dynamic experimental results showed that scheme II-2 (15 cm modified ceramsite + 10 cm) was the best. The average concentration of COD in effluent of CM modified quartz sand + 5 cm modified zeolite is 12.24 mg It is considered that scheme II -2 is the best combination scheme.
【学位授予单位】:兰州交通大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:X52;TU992
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