A method for slowing membrane fouling in membrane capacitive deionization system

A technology for membrane capacitive deionization and membrane fouling, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as membrane fouling, reduction of membrane pore size, and deterioration of membrane performance. The effect of prolonging the service life and suppressing the growth rate

Active Publication Date: 2020-10-02
HOHAI UNIV
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Problems solved by technology

However, membrane capacitive deionization technology also has the problem of membrane fouling, which greatly restricts the widespread operation of this technology.
[0003] The composition of sewage water quality is complex, usually containing a large amount of suspended solids, colloidal substances, organic matter and dissolved substances, etc. After a long period of treatment, reversible and irreversible deposits will inevitably form on the surface of the membrane and inside the membrane pores, resulting in a decrease in the pore size of the membrane or clogging, a gel layer or mud cake layer is formed on the membrane surface, resulting in a decrease in membrane flux and deterioration of membrane performance, reducing the desalination efficiency of membrane capacitive deionization technology

Method used

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  • A method for slowing membrane fouling in membrane capacitive deionization system

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Embodiment 1

[0022] The influent water contains microbial carriers, and the microbial carriers are loaded with facultative anaerobic microorganisms. The concentration of fixed microorganisms on the microbial carriers is 15g / L (dry weight). The influent also contains bovine albumin (BSA), ammonium chloride, Calcium chloride and sodium chloride, the concentration of ammonium chloride is 4mg / L, the concentration of calcium chloride is 180mg / L, the concentration of sodium chloride is 140mg / L, the concentration of BSA is 40mg / L, and the concentration of EDTA is 50mg / L. The initial conductivity of the influent water is maintained at 800 μS / cm; the influent water enters the membrane capacitor module under the action of the water pump for desalination treatment, and the DC power supply provides a stable voltage, and the voltage is maintained at 1.2V; after 55 minutes of desalination treatment, the electrode adsorption reaches saturation, and the effluent The conductivity is stable at 480μS / cm, and ...

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Abstract

The invention discloses a method for slowing membrane pollution in a membrane capacitance deionization system. The method is based on a biological treatment method, EDTA (ethylene diamine tetraacetic acid) with a certain concentration is added into inflow water with microbial carriers, and forming of membrane pollution is slowed by soluble calcium salt and ammonium chloride. By the method, the membrane capacitance deionization system can effectively inhibit growth rate of a biological membrane in long-time desalination treatment, the thickness of a gel layer of the surface of the membrane is remarkably reduced, the desalination efficiency of the membrane capacitance deionization system is greatly improved, and the method solves the problem of serious membrane pollution in the membrane capacitance deionization system to some extent, so that the service life of the membrane is prolonged.

Description

technical field [0001] The invention relates to a method for slowing down membrane pollution in a membrane capacitance deionization system, belonging to the technical field of sewage treatment. Background technique [0002] As a new type of technology, membrane capacitive deionization technology has attracted people's attention. On the basis of electrodeionization, an anion exchange membrane and a cation exchange membrane are attached to the surface of the positive and negative electrodes respectively, and the ion exchange membrane is used. The selective permeability not only ensures the normal adsorption and desorption of ions, but also effectively prevents the ions adsorbed on the electrode surface from being taken away due to water flow disturbance, and prevents the desorbed ions from being reversely adsorbed on the opposite side during the regeneration process. electrode, thus greatly improving the desalination efficiency and electrode regeneration efficiency, and has a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469
CPCC02F1/4691C02F2303/14
Inventor 陈琳王成燚胡勤政
Owner HOHAI UNIV
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