Development of a novel membrane contact ozonation process based on electro-catalytic hydrophobic membrane
LI Kuiling1,2,3,, LIU Hongxin1,2,3, LIU Lie1, WANG Zhiyong1,2,3, GUO Jingjing1,2,3, ZHANG Yong1,2,3, WANG Jun1,2,3,, 1.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 2.National Engineering Laboratory for Industrial Wastewater Treatment, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 3.University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:In membrane contact ozonation (MCO) process, hydrophobic membrane provides enormous gas/liquid interface for the mass transfer of ozone, and thereby showing high efficiency in mass transfer. However, the removal of organic pollutants in the process is achieved based the direct reaction of ozone that is highly selective and requires improvement. In this study, combination of MCO and electrolysis was explored to develop a novel electro-catalytic membrane contact ozonation (ECMCO) process. This emerging process was built upon the mechanism of advanced oxidation, thus being capable of increasing the removal of nitrobenzene. In specific, the ECMCO process has great potential to realize enhancement in both the mass transfer of ozone and the oxidation capacity of the system. This new-built process was thereafter used to explore its feasibility in advanced treatment of effluent derived from the biochemical unit of a winery, and showing that the COD was decreased to lower than 50 mg·L?1 with decoloration being completed. The total operational energy consumption of the ECMCO process was lower than that of the MCO or MCO+H2O2 process. This work developed an novel ECMCO process to address the challenges in terms of low mass transfer of ozone, incompletely mineralization of organic pollutants and high operation cost during the ozonation process, thereby offering an important foundation for further research and industrial applications. Key words:hydrophobic membrane/ membrane contactor/ electro-catalytic/ ozone/ advanced oxidation process.
图1ECMCO工艺示意图 Figure1.Schematic diagram of the ECMCO process
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1.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 2.National Engineering Laboratory for Industrial Wastewater Treatment, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 3.University of Chinese Academy of Sciences, Beijing 100049, China Received Date: 2020-06-01 Accepted Date: 2020-06-13 Available Online: 2020-08-12 Keywords:hydrophobic membrane/ membrane contactor/ electro-catalytic/ ozone/ advanced oxidation process Abstract:In membrane contact ozonation (MCO) process, hydrophobic membrane provides enormous gas/liquid interface for the mass transfer of ozone, and thereby showing high efficiency in mass transfer. However, the removal of organic pollutants in the process is achieved based the direct reaction of ozone that is highly selective and requires improvement. In this study, combination of MCO and electrolysis was explored to develop a novel electro-catalytic membrane contact ozonation (ECMCO) process. This emerging process was built upon the mechanism of advanced oxidation, thus being capable of increasing the removal of nitrobenzene. In specific, the ECMCO process has great potential to realize enhancement in both the mass transfer of ozone and the oxidation capacity of the system. This new-built process was thereafter used to explore its feasibility in advanced treatment of effluent derived from the biochemical unit of a winery, and showing that the COD was decreased to lower than 50 mg·L?1 with decoloration being completed. The total operational energy consumption of the ECMCO process was lower than that of the MCO or MCO+H2O2 process. This work developed an novel ECMCO process to address the challenges in terms of low mass transfer of ozone, incompletely mineralization of organic pollutants and high operation cost during the ozonation process, thereby offering an important foundation for further research and industrial applications.