毕业设计--再生纸废水处理

摘要

针对传统的再生纸废水处理方法一次性投资高、管理难度大、处理效果不理想的问题，本研究将超声波技术与催化内电解工艺相结合，并用于实际再生纸废水的降解预处理。通过对废水COD和色度去除率两项实验指标的考察，探讨了铁-沸石比、铁-铜比、初始pH值、反应时间、超声功率等因素水平对超声-催化内电解耦合反应的影响。同时还进行了超声强化催化内电解法与单独催化内电解法处理再生纸废水的对比实验，最后在已得出的最佳影响条件下，进行该耦合体系的循环小试试验，讨论了该试验方案的可行性。

研究结果表明，超声-催化内电解法能够达到并优于单独催化内电解法对再生纸废水的处理效果。各因素对超声-催化内电解耦合反应的影响按大小次序来说是反应时间> 初始pH值> 铁-铜质量比> 超声功率> 铁-沸石质量比。最佳反应条件为铁-铜-沸石比3:1:1、初始pH值4.0、超声功率200W、曝气量为0.4L/min、反应时间90 mins。在最佳反应条件下COD去除率达到64%以上，色度去除率达74%以上。循环小试试验确定超声-催化内电解出水的最佳回流比为50%，经两次循环后，不同反应时间下废水的COD去除率都稳定在52%~63%，色度去除率最高可达92%。

实验证明，超声协同催化内电解法处理再生纸废水具有可行性。该耦合工艺的设备结构简单、能耗低、操作简便，应用潜力巨大，市场前景十分广阔。

关键词：超声，催化内电解，再生纸废水

ABSTRACT

Due to the problem of the conventional method of recycled paper-making wastewater treatment with high one-time investment, difficult management and unsatisfactory results, the study combines ultrasonic technology with catalyzed internal electrolysis technology and uses the combination as pretreatment to degrade the actually recycled paper-making wastewater. Through inspecting the two indicators of COD removal and color removal, the impact of factors and levels such as iron-zeolite proportion, iron-copper proportion, initial pH, reaction time, ultrasonic power on the us- catalyzed internal electrolysis coupled reaction is investigated. Meanwhile, the comparative experiments between us-catalyzed internal electrolysis and individually catalyzed internal electrolysis are also tested. Finally, we discuss the feasibility of the program by conducting circulation pilot test under the optimum conditions.

The results showed that the treatment effect of us-catalyzed internal electrolysis can achieve even be superior to that of individually catalyzed internal electrolysis. The impact of various factors on the coupled reaction according to the order is the reaction time, initial pH, the ratio of iron to copper, ultrasonic power and the ratio of iron to zeolite. The optimum condition for the ratio of iron - copper - zeolite is 3:1:1; for the initial pH is 4.0; for ultrasonic power is 200 W; for aeration capacity is 0.4 L / min and for the reaction time is 90 mins. Under the optimum conditions COD removal rate is above 64% and color removal rate is above 74%. The best refluent ratio of the circulation is 50%. After twice recycles, the COD removal rates under different reaction times are all stable at 52% ~ 63%, while the highest color removal rate is up to 92%.

The experiments show that the technology that catalyzed internal electrolysis is coordinated by ultrasound is feasible. The coupled process has the advantage of simple equipment, low energy consumption and simple operation. Its application is greatly potential, and the market prospects are very broad.