Device for separating electro-adsorption water-based solution ions and operation method thereof

Abstract

The invention discloses a device for separating electro-adsorption water-based solution ions. The device is provided with a direct current power supply and one or more compound adsorption units, wherein each compound adsorption unit is provided with an electrode plate which is respectively connected with the direct current power supply to form a positive electrode plate and a negative electrode plate; an anion exchange resin layer and a cation exchange resin layer are respectively arranged on the inner side of the positive electrode plate and the inner side of the negative electrode plate; ananion exchange membrane and a cation exchange membrane are respectively arranged on the inner side of the anion exchange resin layer and the inner side of the cation exchange resin layer; a channel for accommodating a treated water-based solution is arranged between the anion exchange membrane and the cation exchange membrane; two ends of the channel are respectively communicated with an inlet pipe and an outlet pipe; the outlet pipe is respectively communicated with a concentrated liquid outlet pipe and a weak liquid outlet pipe through two electrical control valves; and the inlet pipe is communicated with an inlet pipe of a water-based solution to be treated through the electrical control valves. The device can be further provided with a PLC (Programmable Logic Controller) for automatically controlling. The device disclosed by the invention is suitable for desalting sea water and brackish water and separating ions in the water-based solutions as well as has the advantages of complete structure, flexibility in control, high efficiency, energy saving and environment friendliness.

Description

technical field [0001] The invention belongs to the technical field of ion separation in water-based solutions, and in particular relates to a device and an operation method for ion separation by means of electric adsorption and ion exchange. Background technique [0002] At present, the ion separation and concentration of water-based electrolyte solutions mainly include reverse osmosis, distillation, and electrodialysis. When the ion concentration of the solution is high, the osmotic pressure of the system is high, and a greater operating pressure is required when the reverse osmosis method is used for treatment. Even if the energy recovery device is used, the power consumption is also large; Distillation requires steam as the power source, and is mainly used in the condition of power generation lack of steam or waste heat to provide raw steam. At the same time, in order to obtain a higher recovery rate and concentration ratio, there must be more flash stages and effects. ...

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Problems solved by technology

Since this process is accompanied by the passage of continuous bipolar current, and the fluid between fresh water, concentrated water and polar water may conduct electricity at the same time, it is mainly used for deep desalination of water, and the gap between the two membranes includes the ion exchange resin layer. Very small, because the anion and cation are separated by the electrolysis of bipolar ions, if the ion concentration is high, the power consumption will be extremely large, and the existing structure is not suitable for desalination of seawater or brackish water.

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