Electrodialyzer

Abstract

The invention discloses an electrodialyzer. The electrodialyzer comprises an anode plate, a membrane stack, a cathode plate and a compacting plate for fixing and sealing the membrane stack; the membrane stack comprises first film pairs and second film pairs, wherein the first film pairs and the first film pairs are alternately arranged; every first membrane pair sequentially comprises a separatorplate, a first anion exchange membrane, a separator plate and a first cation exchange membrane; every second membrane pair comprises a separator plate, a second anion exchange membrane, a separator plate and a second cation exchange membrane; a monovalent selective cation exchange membrane is further arranged between the anode plate and the first membrane pair adjacent to the anode plate; and eachof the first membrane pair and the second membrane pair of the same group has four compartments to cooperate with the cation exchange membrane, the four compartments respectively have separate waterflow channels, and each compartment is communicated with a corresponding supplied water tank and a produced water tank through the corresponding water channels. The electrodialyzer has the advantagesof separation and recombination of easily-scaled ions, reduction of scaling, and prolongation of the service life of a device.

Description

technical field [0001] The invention relates to an electrodialyzer, in particular to an electrodialyzer capable of separating and recombining ions in fouling-prone saline wastewater. Background technique [0002] With the deteriorating problem of water shortage in our country, the problem of overexploitation of groundwater in northern China is serious. Industrial water is a major user of water resources in my country. my country's long-term plan is to achieve a reuse rate of more than 80% for industrial wastewater, but currently it is generally only about 50%. Therefore, there will be a lot of room for growth in the reuse of industrial wastewater. At the same time, my country's environmental protection policy requires thermal power plants, electroplating, coal chemical industry and other industries to achieve zero discharge of wastewater. [0003] However, the current production cost of reclaimed water for industrial wastewater is too high, the quality of reclaimed water is...

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Problems solved by technology

[0003] However, the current production cost of reclaimed water for industrial wastewater is too high, the quality of reclaimed water is not

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