射流—涡流联合装置的空化效应降解废水中有机污染物的研究

发布时间：2018-06-25 23:06

  本文选题：涡流 + 空化　； 参考：《北京化工大学》2015年硕士论文

【摘要】：印染废水由于其特殊性,具有组分复杂、pH波动大、有机物含量高、色度深、毒性强、难降解等特性,属于难处理的工业废水之一。近年来,随着工艺的发展、新型染料和助剂的研制、应用以及排放标准的日益严格,致使传统的物理、化学、生物法难以满足目前水处理的要求。水力空化技术由于其反应条件温和、能耗低、能有效降解有机物、无二次污染,受到人们的广泛关注。本文通过研究发现：涡流装置对曝气量要求较低,但是对曝气方式、形成气泡的直径以及在流体中分布情况要求较为严格；射流器空化效率较低,但其独有的曝气方式和涡流装置空化效应形成互补,有一定的协同作用。本文首次将射流器和涡流装置进行有机结合并运用于水处理中,以亚甲基蓝模拟印染废水,研究了射流-涡流的强化机制,实验研究了不同空化装置中输入压力、温度和曝气量对装置空化效率的影响,以及废水中盐分和固体颗粒对空化效率的影响,并得到以下结论：1、输入压力(P)、体系温度(T)、曝气量(G/L)对射流器和联用装置的影响规律相同,具有双重影响；三者对于不同装置影响强度不同,但对射流器和联用装置影响最大的都是输入压力；射流器的最优条件为：P=0.1 MPa、T=40℃.G/L=0.05;涡流装置的最优条件：P=0.3MPa、T=40℃、 G/L=0.03。2、亚甲基蓝溶液经射流处理后,亚甲基蓝的去除率为77.6%,但不能被降解；联用装置对亚甲基蓝的去除率高达94.6%,并能将其降解为小分子物质；联用装置相对于射流器空化效果有明显的提高,射流器和涡流装置具有一定的协同作用,但由于结构参数的差异,无法将强化效果充分发挥,因此,装置结构参数有待进一步优化。3、废水中的盐分对装置空化效果有抑制作用；一定粒径和含量的固体颗粒对装置空化效果有强化作用；当两者共存时,盐分占主导作用。
[Abstract]:Because of its particularity, printing and dyeing wastewater is one of the refractory industrial wastewater because of its complex pH fluctuation, high organic content, deep chroma, strong toxicity and difficult to degrade. In recent years, with the development of technology, the development and application of new dyes and auxiliaries, as well as the increasingly stringent emission standards, the traditional physical, chemical and biological methods are difficult to meet the current requirements of water treatment. Because of its mild reaction conditions, low energy consumption, effective degradation of organic matter and no secondary pollution, hydraulic cavitation technology has received extensive attention. In this paper, it is found that the swirl device requires lower aeration rate, but for aeration mode, the diameter of bubble formation and its distribution in fluid are strict, and the cavitation efficiency of jet apparatus is relatively low. However, its unique aeration mode and vortex cavitation effect complement each other and have a certain synergistic effect. In this paper, an organic combination of jet and eddy current device is used in water treatment for the first time, and methylene blue is used to simulate printing and dyeing wastewater. The enhancement mechanism of jet eddy current is studied, and the input pressure in different cavitation devices is experimentally studied. The effect of temperature and aeration rate on cavitation efficiency, and the effect of salt and solid particles in wastewater on cavitation efficiency. The following conclusions are obtained: 1: 1, input pressure (P), system temperature (T), and aeration rate (G / L) have the same effect on the jet and the combined device, and have double effects on the different devices. However, the most important influence on both the jet device and the combined device is the input pressure. The optimal conditions of the jet device are as follows: 1 / P0. 1 MPaI / T 40 鈩，

本文编号：2067917