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Electrochemical filtration process for simultaneous removal of refractory organic and particulate contaminants from wastewater effluents

机译：电化学过滤工艺可同时去除废水中的难降解有机物和颗粒物

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Versatile electrochemical reactions are effective for removing a wide range of water contaminants. This study focuses on the development and testing of bifunctional electrocatalytic filter anodes as reactive and separating media for the simultaneous removal of refractory dissolved organic and particulate contaminants from real wastewater effluents. The results show that the TiO2 particle interlayers formed between the Ti fiber support and the top composite metal oxide catalyst layers assist in reducing filter pores to an effective size range that enables removal of most particulates within the wastewater. The double-sheet design, which is a sandwich-structured module with an internal void space for permeate, prevents filter fouling, and transmembrane pressure can be maintained at a very low level of 5 kPa during batch and continuous flow reactor operations. Substantive and simultaneous removal of dissolved organics (e.g., chromophores, fluorophores, 1,4-dioxane, chemical oxygen demand, and total organic carbon) and particulate matter (i.e., turbidity) are achieved, although removal rates and efficacies differ depending on the electric current density applied. Decolorization and particulate rejection occur swiftly and immediately, but 1,4-dioxane degradation is relatively slow and quite time-dependent. Possible 1,4-dioxane degradation pathways during electrocatalysis are also proposed. Electrochemical filtration technology shows considerable promise for use in the next generation of advanced wastewater treatment solutions. (C) 2018 Elsevier Ltd. All rights reserved.
机译：多种电化学反应可有效去除多种水污染物。这项研究专注于开发和测试双功能电催化过滤器阳极作为反应性和分离性介质，以同时从实际废水中去除难处理的溶解性有机和颗粒污染物。结果表明，在Ti纤维载体和顶部复合金属氧化物催化剂层之间形成的TiO2颗粒夹层有助于将过滤器孔减少到有效尺寸范围，从而能够去除废水中的大多数微粒。双层设计是一个三明治结构的模块，具有内部渗透空间，可防止过滤器结垢，并且在间歇式和连续流式反应器运行期间，跨膜压力可保持在<5 kPa的极低水平。尽管去除率和效率因电而异，但可以同时去除溶解的有机物（例如发色团，荧光团，1，4-二恶烷，化学需氧量和总有机碳）和颗粒物（例如浊度）。施加的电流密度。脱色和微粒排斥迅速而迅速地发生，但是1，4-二恶烷的降解相对缓慢并且非常依赖时间。还提出了在电催化过程中可能的1,4-二恶烷降解途径。电化学过滤技术在下一代高级废水处理解决方案中具有广阔的应用前景。 （C）2018 Elsevier Ltd.保留所有权利。

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