Preliminary study on a novel vacuum membrane percrystallization process
MENG Yunyi1,2,3,, LI Kuiling1,2,3, YU Ling1,2,3, ZHANG Yong1,2,3, LIU Hongxin1,2,3, 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:VMPC process is a new kind of membrane crystallization process. It can realize the simultaneous separation and recovery of solute crystallization and solvent in a single step. In this study, the principle of VPMC process was analyzed and the effects of different temperature and concentration of feed solution, and vacuum operating pressure on the productivity were investigated preliminarily by taking a NaCl solution as the target system. The results showed that VMPC was a co-development process of membrane permeation and vacuum pressure differential flash crystallization. With the increase of feed liquid temperature, water flux and crystallized NaCl flux increased. With the increase of feed liquid concentration, the crystallized NaCl flux increased, while the water flux decreased. In addition, the operating pressure had a significant effect on the morphology of the NaCl crystals rather than crystallization productivity. When the temperature of the feed liquid was 34 ℃, the mass fraction was 25%, and the operating pressure was 0.5 kPa, a NaCl flux up to 8.04 kg·(m2·h)?1 and water flux up to 30 L·(m2·h)?1 were obtained through experiments, which was far higher than the capacity of existing solar-driven evaporator crystallization technologies. This work developed a novel process to address the challenges in terms of complex process flow, high energy consumption, low efficiency and productivity during existing crystallization process of membrane filtration concentrate, thereby provide an important solution for further development and application of efficient treatment technologies of high salinity wastewater. Key words:VMPC process/ membrane crystallization/ crystal nucleation/ high salinity wastewater/ zero liquid discharge.
图1AA-SNC分离层负载前后的无机陶瓷膜外观 Figure1.Appearances of inorganic ceramic membrane before and after loading AA-SNC separation layer
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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: 2021-03-19 Accepted Date: 2021-05-12 Available Online: 2021-07-23 Keywords:VMPC process/ membrane crystallization/ crystal nucleation/ high salinity wastewater/ zero liquid discharge Abstract:VMPC process is a new kind of membrane crystallization process. It can realize the simultaneous separation and recovery of solute crystallization and solvent in a single step. In this study, the principle of VPMC process was analyzed and the effects of different temperature and concentration of feed solution, and vacuum operating pressure on the productivity were investigated preliminarily by taking a NaCl solution as the target system. The results showed that VMPC was a co-development process of membrane permeation and vacuum pressure differential flash crystallization. With the increase of feed liquid temperature, water flux and crystallized NaCl flux increased. With the increase of feed liquid concentration, the crystallized NaCl flux increased, while the water flux decreased. In addition, the operating pressure had a significant effect on the morphology of the NaCl crystals rather than crystallization productivity. When the temperature of the feed liquid was 34 ℃, the mass fraction was 25%, and the operating pressure was 0.5 kPa, a NaCl flux up to 8.04 kg·(m2·h)?1 and water flux up to 30 L·(m2·h)?1 were obtained through experiments, which was far higher than the capacity of existing solar-driven evaporator crystallization technologies. This work developed a novel process to address the challenges in terms of complex process flow, high energy consumption, low efficiency and productivity during existing crystallization process of membrane filtration concentrate, thereby provide an important solution for further development and application of efficient treatment technologies of high salinity wastewater.