超声—电絮凝法处理农药废水试验研究

发布时间：2017-12-27 23:27

本文关键词：超声—电絮凝法处理农药废水试验研究　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

更多相关文章： 电絮凝 超声波 联合处理 农药废水

【摘要】：随着人口的增加和耕地面积的减少,粮食问题已成为制约我国经济发展的一个重要因素。农药的使用使单位面积粮食产量得到了大幅度的提高。但是同时也带来了许多环境问题。其中对水环境的影响尤为严重,因此如何简单、高效的处理农药废水已成为当今社会关注的热点。通过对国内外处理农药废水现状进行归纳总结,分析了各种工艺的优缺点,本文选用电絮凝-超声法对农药废水进行处理,并探究其影响因素,确定最佳操作条件。在单独电絮凝试验中,通过对电解时间、电解电流、电极间距三个因素进行正交实验,三种因素对电絮凝处理农药废水的影响力大小为电解时间电解电流电极间距。电絮凝处理农药废水的最佳操作参数为:电解时间60min,电极间距3cm,电流密度20mA/cm2,在此条件下,废水的CODCr、TOC、色度去除率分别可以达到37.01%、22.89%、51.16%,CODCr的降解动力学过程符合二级反应动力学。在单独超声波法试验中,通过对超声时间、超声功率、废水初始pH值三个因素进行正交实验,三种因素对超声波处理农药废水的影响力大小为超声功率超声时间pH值。在超声辐照时间60min,超声功率200W,pH为4的条件下,农药废水的CODCr、TOC、色度去除率分别可以达到16.42%、11.33%、19.22%,CODCr的降解动力学过程符合一级反应动力学。此外,降低废水的pH,会使废水的处理效果提高。在电絮凝、超声波组合工艺试验中,选用分段和联合处理两种组合方式对农药废水进行了处理,处理效果较好的是联合处理方式,联合处理70min,CODCr、TOC、色度去除率可达65.20%、43.13%、70.65%。相比单独电絮凝、单独超声波法处效果有了很大的提高。超声-电絮凝降解动力学过程符合一级反应动力学。
[Abstract]:With the increase of population and the reduction of cultivated land, the grain problem has become an important factor that restricts the economic development of our country. The use of pesticides has greatly improved the grain output per unit area. But at the same time, there are many environmental problems. The influence of the water environment is particularly serious, so how to treat the pesticide wastewater simply and efficiently has become a hot spot of attention in the society. By summarizing the current situation of pesticide wastewater treatment at home and abroad, the advantages and disadvantages of various processes were analyzed. In this paper, the electrocoagulation and ultrasonic method was applied to treat pesticide wastewater, and its influencing factors were explored, and the best operation conditions were determined. In the separate electrocoagulation test, three factors of electrolysis time, electrolysis current and electrode spacing were orthogonal experiments. The influence of three factors on the electrocoagulation wastewater was electrolysis time and the distance between electrolysis current electrodes. An optimum operation parameters of flocculation treatment of pesticide wastewater, electrolysis time 60min, electrode spacing 3cm, current density 20mA/cm2, under this condition, the removal rate of wastewater CODCr, TOC and chroma can respectively reach 37.01%, 22.89%, 51.16%, the degradation kinetics process of CODCr with two stage reaction kinetics. In the single ultrasonic test, orthogonal experiments were carried out on three factors including ultrasonic time, ultrasonic power and initial pH value of wastewater. The influence of three factors on ultrasonic treatment of pesticide wastewater was pH value of ultrasonic power and ultrasonic time. Under the condition of ultrasonic irradiation time 60min, ultrasonic power 200W and pH 4, the removal rate of CODCr, TOC and chroma of pesticide wastewater can reach 16.42%, 11.33% and 19.22%, respectively. The degradation kinetics of CODCr accords with first-order reaction kinetics. In addition, reducing the pH of the waste water will increase the treatment effect of the wastewater. In the combination process of electrocoagulation and ultrasonic, two combination ways of subsection and joint treatment were selected to treat pesticide wastewater. The combined treatment was the best way to treat pesticide wastewater. Combined treatment of 70min, CODCr, TOC and chroma removal rate could reach 65.20%, 43.13% and 70.65%. Compared with the separate electric flocculation and the single ultrasonic method, the effect has been greatly improved. The kinetic process of ultrasonic electrocoagulation degradation accords with the first order reaction kinetics.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

【参考文献】