圆形孔口多孔板水力空化处理难降解废水的试验研究

发布时间：2018-01-04 18:07

本文关键词：圆形孔口多孔板水力空化处理难降解废水的试验研究　出处：《浙江工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：利用空化效应降解废水是一种无需额外添加药剂的技术,符合绿色环保的环境理念,具有良好的应用前景。然而对该技术降解废水的影响因素的研究还不够深入,此外空化效应降解废水的机理尚未明了,这为该水处理技术产业化带来了一定的困难。本文主要针对水力空化效应降解废水的影响因素展开一系列试验研究,为其在废水降解工程的推广应用及水力空化反应器的优化设计提供参考。本文首先选用自主研发的圆形孔口多孔板水力空化反应器,进行废水降解的试验研究,试验研究了两种废水:一种是人工配制的对硝基苯酚(P-NP)废水;另一种是取自杭州本地企业的化工废水。探究了圆形孔口多孔板的几何设计参数(孔口数量、孔口大小、孔口排列方式)以及降解反应环境(处理时间,初始浓度、孔口流速、p H值、空化数)分别与废水降解率的关系。分析试验数据发现,废水降解率既受圆形孔口多孔板的几何设计参数的影响,同时也受降解反应环境的影响。其次,本文选用亚甲基兰进行羟自由基捕捉试验,通过定量分析水力空化反应器内产生的羟自由基,探究羟自由基产量与水力空化技术降解废水效果的关系。试验数据显示增加羟基自由基量可提高废水降解率。为了探究空化数对废水降解效果的影响,试验过程中选用动态数据采集系统实时采集多孔板后的液体内部压力,试验数据显示降低空化数可以提高化工废水降解率。
[Abstract]:The degradation of wastewater by cavitation effect is a kind of technology which does not need additional chemicals, and accords with the concept of environmental protection. However, the research on the influencing factors of the degradation of wastewater by this technology is not deep enough, and the mechanism of degradation of wastewater by cavitation effect is not clear. This brings some difficulties to the industrialization of water treatment technology. This paper mainly focuses on the factors affecting the degradation of wastewater by hydraulic cavitation effect. This paper provides a reference for its application in wastewater degradation engineering and the optimal design of hydraulic cavitation reactor. Firstly, the experimental study of wastewater degradation is carried out by using the circular orifice porous plate hydraulic cavitation reactor developed by ourselves. Two kinds of wastewater were studied: one was the artificial P-NPP wastewater; The other is chemical wastewater from local enterprises in Hangzhou. The geometric design parameters (number of holes, size of holes, orifice arrangement) and degradation reaction environment (treatment time) of circular perforated perforated plates were investigated. The relationship between the initial concentration, flow velocity and cavitation number) and the degradation rate of wastewater were analyzed. It was found that the degradation rate of wastewater was affected by the geometric design parameters of circular perforated plate. At the same time, it is also affected by the degradation reaction environment. Secondly, methylene blue is selected for hydroxyl radical capture test, through quantitative analysis of hydroxyl free radicals produced in hydraulic cavitation reactor. To explore the relationship between the production of hydroxyl radical and the effect of hydraulic cavitation technology on the degradation of wastewater. The experimental data show that increasing the amount of hydroxyl radical can increase the degradation rate of wastewater. In order to explore the effect of cavitation number on the degradation efficiency of wastewater. The dynamic data acquisition system was used to collect the internal pressure of the liquid after the porous plate was collected in real time. The experimental data showed that the degradation rate of chemical wastewater could be increased by reducing the cavitation number.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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