Lyu Cong, Zhou Dandan, Wang Jun
Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, China.
School of Environment, Northeast Normal University, Changchun, 130117, China.
Environ Sci Pollut Res Int. 2016 Oct;23(20):20893-20903. doi: 10.1007/s11356-016-7272-2. Epub 2016 Aug 3.
Traditionally, a few processes have to be employed in sequence for multi-dye removal, due to the different physical and chemical characteristics of the dyes. In this study, we innovatively developed an integrated adsorption and Fenton oxidation fluidized bed reactor (FBR) based on the hydraulic classification theory, which could efficiently remove dispersed red, acid yellow, and reactive brilliant dyes. The fluidized solids such as ceramsite and activated carbon could be separately fluidized at the bottom and the top part of the FBR, respectively. As a result, Fenton oxidization of dyes was promoted by the fluidization of ceramsite and activated carbon. Besides, adsorption of activated carbon could synergistically act on the dyes. The results showed that the removal efficiencies of acid yellow 2G, disperse red 60, and reactive brilliant blue X-BR could reach 100, 79.8, and 84.9 % in 10 min, respectively. Lots of intermediates with unsaturated bonds were generated during Fenton reaction, which was further removed by adsorption of activated carbon. Consequently, a high COD removal of 93 % was obtained. Interestingly, some of Fe produced during Fenton reaction was further precipitated and crystallized as FeO(OH) or Fe(OH) on the surface of activated carbon and ceramsite, which could be potentially recycled for further utilization as a heterogeneous catalyst. Meanwhile, the other Fe might be removed in the form of ferro-organic complexes by adsorption onto the activated carbon. Thus, only a little iron hydroxide sludge was generated in the FBR. This novel FBR gave us an effective clue to realize multi-reactions for textile wastewater treatment by employing hydraulic classification fluidization.
传统上，由于染料具有不同的物理和化学特性，因此必须依次采用几个过程来去除多种染料。在本研究中，我们基于水力分级理论创新性地开发了一种集成吸附和芬顿氧化流化床反应器（FBR），该反应器能够有效去除分散红、酸性黄和活性艳红染料。诸如陶粒和活性炭之类的流化固体可以分别在FBR的底部和顶部流化。结果，陶粒和活性炭的流化促进了染料的芬顿氧化。此外，活性炭的吸附可以协同作用于染料。结果表明，酸性黄2G、分散红60和活性艳蓝X-BR在10分钟内的去除效率分别可达100%、79.8%和84.9%。在芬顿反应过程中产生了许多带有不饱和键的中间体，这些中间体通过活性炭的吸附被进一步去除。因此，COD去除率高达93%。有趣的是，芬顿反应过程中产生的一些铁进一步沉淀并在活性炭和陶粒表面结晶为FeO(OH)或Fe(OH)，这些物质有可能作为非均相催化剂被回收再利用。同时，其他铁可能通过吸附到活性炭上以铁有机络合物的形式被去除。因此，FBR中仅产生少量氢氧化铁污泥。这种新型FBR为我们通过采用水力分级流化实现纺织废水处理的多反应提供了有效线索。
