磁化电动法处理污泥中重金属的研究

发布时间：2018-01-14 15:17

本文关键词：磁化电动法处理污泥中重金属的研究　出处：《大连海事大学》2017年硕士论文　论文类型：学位论文

【摘要】：污水厂处理后的污泥中含有有机质、氮、磷、钾等营养物质,同时也含有Cd、Pb、Zn等会造成环境污染的重金属。将污泥中的重金属去除,则可将污泥用于农业用途,将污泥资源化利用。电动力法作为一种原位修复技术,具有重金属污染物可回用、处理较彻底等优点。而利用磁化电动法在外加磁场下发生的电动力过程允许较大的电流密度,对某些金属可提高其去除率。因此,本文探究电动力法以及磁化电动法去除污泥中重金属的影响因素,以期进一步提高重金属的去除效率,优化去除污泥中重金属的方法。研究内容分为两部分:第一部分探究电动力法处理污泥中重金属的影响因素,包括电解时间、电压、pH值、循环阴极电解液、搅拌污泥和极板面积;第二部分探究磁化电动法处理污泥中重金属的影响因素,包括磁场方向和磁场强度。实验结果显示,延长电解时间、增强电解电压、降低污泥初始pH值、控制阴极电解液pH值、不搅拌污泥、增大极板面积可有效增强污泥中重金属的去除率。其中,污泥初始pH值是影响重金属去除率的重要因素。电动力法中,当污泥初始pH=3时,Cd、Pb、Zn的去除率达最大值,分别为85.77%、31.14%、85.36%,各重金属剩余量均符合污泥农用标准的规定。磁化电动法可有效优化电动处理效果,提高重金属去除率。当磁场强度为9.5mT、磁场方向垂直时,Cd、Zn去除率达最大值,分别为96.62%、88.84%,Pb的去除效果无明显改善。
[Abstract]:Sewage sludge after treatment contains organic matter, nitrogen, phosphorus, potassium and other nutrients, and also contains heavy metals, such as CD, Pb, Zn and so on, which will cause environmental pollution. The heavy metals in the sludge are removed. The sludge can be used for agricultural use, and the sludge can be reused. As an in-situ remediation technology, the electrokinetic method has heavy metal pollutants that can be reused. The electrodynamic process with magnetized electromotive method under the applied magnetic field allows for higher current density, which can improve the removal rate of some metals. In this paper, the factors affecting the removal of heavy metals in sludge by electrodynamic method and magnetized electrokinetic method are discussed in order to further improve the removal efficiency of heavy metals. The study is divided into two parts: the first part is to explore the factors affecting the treatment of heavy metals in sludge by electrodynamic method, including electrolytic time, voltage and pH value, circulating cathode electrolyte. Stirred sludge and plate area; In the second part, the factors affecting the treatment of heavy metals in sludge by magnetization electromotive method were investigated, including the direction of magnetic field and the intensity of magnetic field. The experimental results showed that the electrolytic time was prolonged, the electrolytic voltage was enhanced, and the initial pH value of sludge was reduced. Controlling the pH value of cathode electrolyte without stirring sludge and increasing the plate area can effectively enhance the removal rate of heavy metals in sludge. The initial pH value of sludge is an important factor affecting the removal rate of heavy metals. When the initial pH of sludge was 3:00, the removal rate of CD ~ (2 +) ~ (2 +) ~ (2 +) was 85.77% and 85.36%, respectively. The residual amount of heavy metals is in accordance with the agricultural standard of sludge. The magnetization electrokinetic method can effectively optimize the effect of electric treatment and improve the removal rate of heavy metals. When the magnetic field intensity is 9.5 Mt and the magnetic field direction is perpendicular to the magnetic field. The removal rate of Zn reached the maximum value, 96.62% and 88.84% respectively, and the removal efficiency of Pb was not obviously improved.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

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