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Electrodialysis plant and method

一种电渗析、电极的技术，应用在水处理装置领域，能够解决消耗、降低系统效率等问题

Inactive Publication Date: 2009-07-01
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual electrodialysis process, when the current reaches the limiting current, water will be decomposed into hydrogen ions and hydroxide ions. This hydrolysis process will consume part of the electric energy and reduce the system efficiency.

Method used

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  • Electrodialysis plant and method
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  • Electrodialysis plant and method

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Embodiment approach

[0015] As an embodiment of the present invention, an electrodialysis device includes a first electrode, a second electrode separated from the first electrode by a certain distance, and a controller. The controller controls current delivered from a power source to said first and second electrodes. Under the control of the controller, the power supply can switch from a first mode to a second mode in each cycle, and the current polarity in the second mode is opposite to that in the first mode. Said current has several cycles with a certain duration and frequency.

[0016] The electrodialysis device includes at least one dilute chamber, and as an embodiment of the present invention, the controller further controls the opening and closing of a valve, so that the water flow passing through the membrane surface is dynamically changed.

[0017] The electrodialysis unit includes an ion exchange membrane in contact with an influent stream flowing thereinto, the ion exchange membrane ad...

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PUM

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Abstract

The invention relates to an electrodialysis device and an electrodialysis method. The electrodialysis device comprises a first electrode, a second electrode which is at a certain distance from the first electrode and a controller. The controller controls the current following from a power supply to the first and second electrodes. Under the control of the controller, the power supply can switch from a first mode to a second mode in each cycle. The current polarity in the first mode is opposite to that in the second mode. The frequency of the current is about 100 to 1,000 Hz.

Description

technical field [0001] The invention relates to a water treatment device and method, in particular to an electrodialysis device and method. Background technique [0002] Electrodialysis devices and methods can be used for desalination and water desalination. Generally, an electrodialysis device may include a pair of electrodes and several ion exchange membranes located between the pair of electrodes. The ion exchange membranes generally include two types of cation exchange membranes and anion exchange membranes. A cation exchange membrane refers to a membrane in which cations with a smaller molecular weight are easy to pass through, while anions or cations with a larger molecular weight are difficult to pass through; an anion exchange membrane means that anions with a smaller molecular weight are easy to pass through, while cations or anions with a larger molecular weight are difficult to pass through membrane. The cation exchange membrane and the anion exchange membrane a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469
CPCB01D2321/226C02F2201/4615C02F1/469B01D61/52C02F2201/4613B01D2313/48C02F2103/08B01D2321/223B01D61/44C02F2201/4616C02F1/4693B01D65/08Y02A20/124Y02A20/131
Inventor 杜宇蔡巍魏昶熊日华刘云峰杨潮袁晓明王胜先夏激扬毛赛君曹春
Owner GENERAL ELECTRIC CO
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