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Abstract：
In this study, ozone catalysts (hydrogenation-modified red mud, HM-RM) successfully prepared by hydrogenation-modification of industrial hazardous solid waste red mud (RM) as a raw material in accordance with the viewpoint of treating waste with waste and using waste. Meanwhile, as for the common phenomenon of membrane fouling, uneven distribution of multiphase solid catalysts and ozone in liquids, the addition of ultrasound can not only disperse materials, but also play a role in online cleaning of ceramic membranes and catalysts. The optimum treatment conditions for Rhodamine B (RhB) solution with volume of 2 L and concentration of 40 mg/L were catalyst concentration of 0.4 mg/L, reaction temperature of 45 °C, ultrasonic time of 1 h, ultrasonic intensity of 600 W, removal rate of RhB was up to 90 %. In addition, the computational fluid dynamics (CFD) simulation method was used to investigate the fluid flow between the two gas-liquid phases and the effect of the negative pressure of the membrane pump on the fluid by the analysis of flow, pressure and ozone flux of the ceramic membrane(CM) reaction apparatus. The CFD simulation results showed that at the inlet gas-liquid flow rate of 3 m/s and the negative pressure of 20,000 Pa, the maximum flow rates of CM-1 were 3 m/s, 0.752 m/s for CM-2, and 0.228 m/s for CM-3, respectively. Vortices, which are beneficial to solid-liquid mixing and gas-liquid mass transfer, formed between the suction port CM-1 of CM-1 and the inlets of CM-2 and CM-3. This discovery is consistent with relevant experimental research results. Significantly higher concentrations of both •OH and dissolved ozone were observed in the US/HM-RM/O3 system compared to other systems, indicating the significant improvement in ozone utilization rate through the application of ultrasound. The superiority of the US/HM-RM/O3 device was demonstrated. The real dye effluent was tested under optimum operating conditions and the results showed that COD and TOC were reduced by 81.34 % and 60.23 % respectively after 180 min of treatment. The above research can provide technical support for the treatment of dye wastewater using Ultrasound-enhanced ozone oxidation ceramic membranes.
摘要：
在这项研究中,臭氧催化剂(加氢改性赤泥，HM-RM）根据用废物处理废物和利用废物的观点，通过将工业危险固体废物赤泥（RM）作为原料进行加氢改性成功制备。同时,至于常见的膜污染现象，多相固体催化剂和臭氧在液体中的不均匀分布，超声波的加入不仅可以分散材料，而且还起到在线清洗陶瓷膜和催化剂的作用。罗丹明B(RhB)溶液体积为2L,浓度为40mg/L的最佳处理条件为催化剂浓度为0.4mg/L,反应温度为45°C，超声时间1小时，600W的超声强度，RhB的去除率可达90%。此外,采用计算流体力学(CFD)模拟方法,通过流动分析研究了气液两相之间的流体流动以及隔膜泵负压对流体的影响,陶瓷膜(CM)反应装置的压力和臭氧通量。CFD模拟结果表明,在入口气液流速为3m/s,负压为20,000Pa时,CM-1的最大流量为3m/s，CM-2为0.752m/s，CM-3为0.228m/s。漩涡,有利于固液混合和气液传质,在CM-1的吸入口CM-1与CM-2和CM-3的入口之间形成。这一发现与相关实验研究结果是一致的。与其他系统相比，在US/HM-RM/O3系统中观察到显著更高浓度的OH和溶解臭氧。表明通过应用超声波显著提高了臭氧利用率。证明了US/HM-RM/O3器件的优越性。在最佳操作条件下对实际染料废水进行了测试，结果表明，处理180min后，COD和TOC分别降低了81.34％和60.23％。上述研究可为超声增强臭氧氧化陶瓷膜处理染料废水提供技术支持。
