Membrane-electric adsorption device for desalination system

Abstract

The invention relates to a membrane-electric adsorption device for a desalination system and belongs to the technical field of water treatment desalination. The core part of the device is membrane-electric adsorption units, a cation exchange membrane is covered on the surface of a mesoporous carbon electrode as a negative electrode in each membrane-electric adsorption unit, an anion exchange membrane is covered on the surface of the mesoporous carbon electrode as a positive electrode, a layer of frame-shaped insulation and isolation net is arranged between the ion exchange membranes, water guide plates are arranged on the two sides of each membrane-electric adsorption combined unit, a water guide hole is formed at the lower part of the front water guide plate which is near the water inlet end, the water guide hole is formed at the upper part of the rear water guide plate which is near the water outlet end, the water guide holes are respectively formed on the upper surfaces and the lower surfaces of the middle water guide plates, saline to be treated enters from a water inlet and is uniformly distributed to all the membrane-electric adsorption units via the water guide hole at the lower part, and the water flow is upward in a parallel manner in all the membrane-electric adsorption units and flows out of the water guide hole at the upper part and a water outlet. The device provided by the invention has the advantages of simplicity in assembly, high desalination efficiency, small hydraulic resistance and low energy consumption.

Description

technical field [0001] The invention relates to a membrane-electric adsorption device used in a desalination system, belonging to the technical field of water treatment and desalination. Background technique [0002] Electrosorption technology is an emerging technology that uses the surface of a charged electrode to adsorb ions in water to achieve ion enrichment and salt removal. In recent years, it has become a research hotspot in the field of desalination. The core unit of the electro-adsorption desalination device is the electro-adsorption module. The working principle of the traditional electro-adsorption module is as follows: when a DC voltage is applied to a pair of electrodes, the negative and positive ions are respectively absorbed by the positive and negative electrodes of the module, and when they reach a certain concentration, they are saturated. Regeneration, the ions diffuse from the pores inside the electrodes to the flow channels between the electrodes, and ...

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Problems solved by technology

Although the electric double layer will basically disappear at the end of the electrode regeneration, due to the existence of a certain number of groups on the electrode surface, these groups will adsorb some ions, which will reduce the electrosorption efficiency of the electrode in the next working cycle.

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