磁场辅助沉淀池设计及其性能研究

发布时间：2018-02-24 12:31

本文关键词： 废水沉淀池磁场悬浮物　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着人们生活水平不断的提高,国内污水处理行业正在快速增长,污水处理总量不断增加,城镇污水处理率不断提高。但目前中国污水处理行业仍处于发展的初级阶段,污水处理技术还有待更进一步的创新发展。近年来,污水处理技术不断发展,涌现了很多新方法和手段。利用磁场强化沉降污(废)水中的污染物(尤其是高浓度和低浓度的污染物)已成为一项新型的水处理技术。磁技术可以单独使用也可以与其他水处理技术联合使用,其在处理过程中能耗低、易于操作、无二次污染且成本低,是一项极具发展前景的技术。本研究在传统沉淀法的基础上,采用磁场和平流式沉淀池相结合的方式,构建磁场辅助沉淀系统,以模拟废水为处理对象,进行试验。通过模拟沉淀试验,验证了磁场辅助沉淀法处理废水的可行性;通过有无磁场辅助作用的对比试验,研究了磁场辅助沉淀系统的处理效果;通过沉淀系统的单因素试验,详细的探讨了沉淀系统处理效果与影响因素的变化规律;通过磁场辅助沉淀系统的正交试验,探讨了磁场辅助沉淀系统的最佳运行参数。试验结果表明:(1)磁场辅助沉淀系统处理废水是可行的。(2)有磁场辅助沉淀系统的处理效果较无磁场辅助沉淀系统的处理效果好、处理效率高;根据试验结果可知水力负荷、进水悬浮物浓度和沉淀时间等对悬浮物去除率和浊度去除率的影响是相互关联相互牵制的,所以影响沉淀处理废水试验处理效果的主要因素应该控制在一定的范围内.(3)在磁场辅助沉淀系统中沉淀池的水力负荷是影响悬浮物处理效果的最主要因素,其次则是悬浮物的进水浓度,最后是沉淀时间,而沉淀池的水力负荷和悬浮物的进水浓度是影响浊度处理效果的最主要因素,其次则是沉淀时间。得出磁场辅助沉淀系统的最佳操作条件为水力负荷Q=0.1m3/m2·h、悬浮物进水浓度C=100mg/L、沉淀试验时间T=30min,此时悬浮物和浊度的去除率均达到最大值。(4)本设计磁场辅助沉淀装置应用于长沙某电子企业废水处理工艺流程中的试验处理效果较好,处理后出水水质指标均达到国家排放标准的要求。
[Abstract]:With the continuous improvement of people's living standards, the domestic sewage treatment industry is growing rapidly, the total amount of sewage treatment is increasing, and the rate of urban sewage treatment is increasing. However, at present, the sewage treatment industry in China is still in the primary stage of development. Sewage treatment technology needs further innovation and development. In recent years, sewage treatment technology has been developing continuously. Many new methods and methods have emerged. The application of magnetic field to enhance the deposition of pollutants in sewage (waste) water (especially high and low concentrations of pollutants) has become a new type of water treatment technology. Magnetic technology can be used separately. Can be used in conjunction with other water treatment technologies, It is a promising technology with low energy consumption, easy operation, no secondary pollution and low cost. A magnetic field assisted precipitation system was constructed to treat simulated wastewater. The feasibility of magnetic field assisted precipitation method for wastewater treatment was verified by simulated precipitation test. The treatment effect of the magnetic field assisted precipitation system is studied. Through the single factor test of the precipitation system, the variation law of the treatment effect and the influencing factors of the precipitation system is discussed in detail, and the orthogonal test of the magnetic field assisted precipitation system is carried out. The optimum operating parameters of the magnetic field assisted precipitation system are discussed. The experimental results show that the magnetic field assisted precipitation system is feasible for treating wastewater. The magnetic field assisted precipitation system has better treatment effect than the non magnetic field assisted precipitation system. According to the experimental results, the effects of hydraulic load, influent suspended substance concentration and settling time on the removal rate of suspended solids and turbidity removal are interrelated and mutually controlled. Therefore, the main factors affecting the effect of wastewater treatment should be controlled within a certain range.) in the magnetic field assisted sedimentation system, the hydraulic load of the settling tank is the most important factor affecting the treatment effect of suspended solids. Secondly, the influent concentration of suspended solids, and finally the settling time, and the hydraulic load of sedimentation tank and the influent concentration of suspended solids are the most important factors affecting the turbidity treatment effect. The optimum operating conditions of the magnetic field assisted precipitation system are as follows: hydraulic loading: 0.1 m3 / m ~ 2 路h, influent concentration C _ (100 mg / L) of suspended solids, sedimentation test time T _ (30) min, the removal rate of suspended solids and turbidity reaching the maximum value. The field-assisted sedimentation device has been applied to the experimental treatment of wastewater treatment process in an electronic enterprise in Changsha. After treatment, the water quality index of the effluent meets the requirements of the national discharge standard.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU991.23

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