Method for purifying iodized salt-containing wastewater by using flowing electrode capacitive deionization device

Abstract

The invention discloses a method for purifying iodized salt-containing wastewater by using a flowing electrode capacitive deionization device, which adopts the flowing electrode capacitive deionization device to carry out adsorption treatment on the iodized salt-containing wastewater, and the flowing electrode capacitive deionization device comprises an anode flowing electrode chamber, a water inlet chamber and a cathode flowing electrode chamber, wherein the cathode flowing electrode chamber contains cathode flowing electrode liquid, and the cathode flowing electrode liquid comprises electrolyte, a conductive agent, a redox active substance and a solvent. The method for purifying the iodized salt-containing wastewater by using the flowing electrode capacitive deionization device has the advantages of simplicity in operation, low treatment cost, low treatment energy consumption, wide application range, high desalination efficiency, good desalination effect, stability in operation, continuous desalination, no secondary pollution and the like; the method can achieve a better purification effect on the iodized salt-containing wastewater on the premise of not increasing energy consumption and not causing secondary pollution, and has very important significance on low-cost, efficient and thorough treatment of the iodized salt-containing wastewater.

Description

technical field [0001] The invention belongs to the field of application of flow capacitive deionization technology and water treatment science, and relates to a cathode flow electrode liquid, flow electrode capacitance deionization device and application thereof. Background technique [0002] Iodine-containing salt wastewater refers to containing salt substances as Cl - , SO 4 2- 、Na + , Ca 2+ and other substances, and also contain I - and / or I 3 - Wastewater of such salt substances mainly comes from chemical plants, shale gas exploitation and other processes to produce iodine-containing salinized wastewater, in which iodine-containing disinfection by-products (I-DBP S ) is a chlorinated by-product formed during chlorination disinfection of iodized salt wastewater. There are low concentrations of I-DBPs in drinking water, water treatment plants, seawater desalination plants and distribution systems, which are carcinogenic, genotoxic and other hazards , DBP in drinki...

AI Technical Summary

Problems solved by technology

Compared with the traditional electrode capacitive deionization (CDI) technology, the FCDI technology improves the desalination effect by using the flowing electrode suspension instead of the traditional fixed electrode, but due to the dispersion of active materials suspended in the flowing electrode slurry, there is discontinuous conductivity , would lead to inefficient charge transfer between the current collector and the flowing electrode

Studies have also proved that increasing the carbon content or introducing carbon black can promote electron transport, but it will lead to a corresponding increase in the viscosity of the flow electrode, which may lead to blockage of the electrode channel, so it is difficult to ensure the stable, long-term and efficient operation of the reactor

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