Fenton流化床—混凝沉淀深度处理造纸废水的试验研究

发布时间：2018-06-04 01:50

本文选题：造纸废水 + Fenton　；参考：《郑州大学》2015年硕士论文

【摘要】：目前造纸废水主要采用比较成熟的“物化+生化”处理工艺,但随着国家对污染物排放标准的不断提升,出水越来越难以达标排放,亟需探索出处理效果良好又经济可行的深度处理方法。本论文采用“Fenton流化床+混凝沉淀”组合工艺对造纸废水进行深度处理研究,造纸废水取自新密市造纸群工业污水处理厂收集的来自于周边多家造纸企业经内部污水站处理后排入的混合废水。论文中还阐述了造纸废水的来源与深度处理的必要性,并对相关深度处理技术研究进展进行介绍。首先,采用Fenton流化床深度处理造纸废水,通过单因素试验和曲面响应分析,得出影响因素之间的显著关系为:进水p H值H2O2的投加量载体填充率[H2O2]/[Fe2+]摩尔比反应时间。运用Box-Behnken设计对去除指标COD的去除率和影响因素之间建立二次拟合方程,其相关系数的平方为0.937,表明拟合模型精度很高。此后进行优化分析,得出理论最佳运行条件为:初始p H值为3.6,H2O2的投加量为1.52 ml/L,载体填充率为28.8%,[H2O2]/[Fe2+]摩尔为4.86,反应时间为58min,在此条件下运行后预测的COD去除率为74.8%;通过重复试验得出,实际的COD去除率为72.4%,与预测值相对偏差3.14%,表明曲面响应分析对运行条件优化和COD去除效率的预测较为准确。此后进行对比试验得出,Fenton流化床添加有覆膜铁氧化物的石英砂载体后,COD的去除效率较传统Fenton反应提升15.8%。然后对Fenton流化床出水进行混凝沉淀试验,当控制反应条件为:初始p H值为7.0,质量分数为0.1%的PAM投加量为1.2ml/L时,COD和色度的去除效率分别为21.5%和69.3%。本论文研究对即将开展的实际工程建设具有一定的理论指导作用,同时对工业废水深度处理的工艺选择方面提供相关的技术参考。
[Abstract]:At present, papermaking wastewater is mainly treated by "physical, chemical and biochemical" treatment process. However, with the continuous improvement of the national standards for pollutant discharge, the effluent is becoming more and more difficult to meet the discharge standard. It is urgent to explore an effective and economical advanced treatment method. In this paper, the advanced treatment of papermaking wastewater was studied by "Fenton Fluidized bed Coagulation sedimentation" process. The papermaking wastewater is collected from the industrial wastewater treatment plant of Xinmi papermaking group. It comes from the mixed wastewater discharged by several paper making enterprises in the surrounding area after being treated by the internal sewage station. The source of papermaking wastewater and the necessity of advanced treatment are also discussed in this paper, and the research progress of related advanced treatment technology is also introduced. Firstly, Fenton fluidized bed was used for advanced treatment of papermaking wastewater. By single factor test and surface response analysis, the significant relationship between the influencing factors was obtained: the reaction time of carrier filling rate [H2O2] / [Fe2] molar ratio of influent pH value H2O2 was obtained. The quadratic fitting equation between the removal rate of COD and the influencing factors is established by using Box-Behnken design. The square of the correlation coefficient is 0.937, which indicates that the precision of the fitting model is very high. After that, the optimization analysis was carried out. The optimal operating conditions are as follows: the initial pH value of 3.6N H _ 2O _ 2 is 1.52 ml / L, the carrier filling rate is 28.885, the mole of [H2O2] / [Fe2] is 4.86, the reaction time is 58min, and the predicted COD removal rate is 74.8% after running under this condition. The actual COD removal rate is 72.4, which is 3.14 relative deviation from the predicted value, which indicates that the surface response analysis is more accurate in predicting the operation conditions optimization and COD removal efficiency. The results show that the removal efficiency of Fenton in Fenton fluidized bed is 15. 8% higher than that in traditional Fenton reaction after adding quartz sand carrier with coated iron oxide. Then the coagulation sedimentation test was carried out on the effluent of Fenton fluidized bed. When the initial pH value was 7.0 and the dosage of PAM 0.1% by mass fraction was 1.2ml/L, the removal efficiency of PAM and chromaticity were 21.5% and 69.3%, respectively. The research in this paper has a certain theoretical guidance function for the actual engineering construction to be carried out, and provides relevant technical reference for the process selection of advanced treatment of industrial wastewater at the same time.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X793

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