一、设备简介

1、 Equipment introduction

电去离子Electrodeionization，简称EDI，又称连续电解除盐技术，它地将电渗析技术和离子交换技术融为一体，通过阴、阳离子的选择透过作用以及离子交换树脂对水中离子的交换作用，在电场的作用下实现水中离子的定向迁移，从而达到水的深度净化除盐，并通过水电解产生的氢离子和氢氧根离子对装填树脂进行连续再生，因此EDI制水过程不需酸、碱化学药品再生即可连续制取高品质超纯水。

EDI (electrodeionization for short) is also called continuous electrolysis desalination technology. It integrates electrodialysis technology and ion exchange technology. Through the selective permeation of anion and cation and the ion exchange of ion exchange resin in water, the directional migration of ions in water is realized under the action of electric field, so as to achieve the deep purification and desalination of water, The resin was regenerated continuously by hydrogen ion and hydroxyl ion produced by water electrolysis. Therefore, the EDI water production process can continuously produce high-quality ultra pure water without acid and alkali chemicals regeneration.

半导体、集成电路芯片及封装、液晶显示、高精度线路板、光电器件、各种电子器件、微电子工业、大规模、超大规模集成电路需用大量的纯水、高纯水、超纯水清洗半成品、成品。集成电路的集成度越高，线宽越窄，对水质的要求也越高。目前我国电子工业部把电子级水质技术分为五个行业等级，分别为18MΩ.cm、15MΩ.cm、10MΩ.cm、2MΩ.cm、0.5MΩ.cm，以区分不同水质。

Semiconductors, integrated circuit chips and packages, liquid crystal displays, high-precision circuit boards, optoelectronic devices, various electronic devices, microelectronics industry, large-scale and ultra large-scale integrated circuits need a lot of pure water, high-purity water and ultra pure water to clean semi-finished products and finished products. The higher the integration of integrated circuit, the narrower the line width, and the higher the requirement of water quality. At present, China's Ministry of electronic industry divides electronic grade water quality technology into five industry grades, namely 18m Ω. cm、15M Ω. cm、10M Ω. cm、2M Ω. cm、0.5M Ω. Cm to distinguish different water quality.

二、设备原理

2、 Equipment principle

电去离子(EDI)系统主要是在直流电场的作用下，通过隔板的水中电介质离子发生定向移动，利用交换膜对离子的选择透过作用来对水质进行提纯的一种的水处理技术。电渗析器的一对电极之间，通常由阴膜，阳膜和隔板(甲、乙)多组交替排列，构成浓室和淡室(即阳离子可透过阳膜,阴离子可透过阴膜)。淡室水中阳离子向负极迁移透过阳膜,被浓室中的阴膜截留;水中阴离子向正极方向迁移阴膜,被浓室中的阳膜截留，这样通过淡室的水中离子数逐渐减少，成为淡水，而浓室的水中，由于浓室的阴阳离子不断涌进，电介质离子浓度不断升高，而成为浓水，从而达到淡化、提纯、浓缩或精制的目的。

Electrodeionization (EDI) system is a kind of water treatment technology, which is mainly under the action of DC electric field, the dielectric ions in the water through the separator move directionally, and the water quality is purified by using the selective penetration of ion by exchange membrane. Between a pair of electrodes of an electrodialyzer, there are usually many groups of negative membrane, positive membrane and separator (A and b) alternately arranged to form a concentrated chamber and a dilute chamber (that is, cation can pass through the positive membrane and anion can pass through the negative membrane). The cation in the dilute chamber migrates to the negative electrode, passes through the positive membrane and is intercepted by the negative membrane in the concentrated chamber; The anions in the water migrate to the positive membrane and are intercepted by the positive membrane in the concentration chamber. In this way, the number of ions in the water passing through the thin chamber gradually decreases and becomes fresh water. However, the water in the concentration chamber becomes concentrated water due to the continuous inflow of anions and anions in the concentration chamber and the increasing concentration of dielectric ions, so as to achieve the purpose of desalination, purification, concentration or refinement.

三、工艺流程

3、 Process flow

1、如图片“工艺流程图---EDI“

1. Such as the picture "process flow diagram EDI"“

四、技术参数

4、 Technical parameters

产水量

Water yield

根据需求订制（0.5-300吨/时）

Customized according to demand (0.5-300 T / h)

原水源

Raw water source

自来水或地下水（电导率小于400us/cm）

Tap water or groundwater (conductivity less than 400us / cm)

产水水质

Quality of produced water

电导率小于0.056us/cm(电阻率≥18MΩ/cm)

The conductivity is less than 0.056us/cm (resistivity ≥ 18m) Ω/ cm)

设备功率

Equipment power

5KW-800KW

5KW-800KW

运行状态

running state

自动运行、定时反洗

Automatic operation and timing backwashing

反洗频率

Backwash frequency

随进水水质而变化（1～3天）

Change with influent water quality (1-3 days)

化学清洗

chemical cleaning

随膜材质及膜污染情况而定

It depends on membrane material and membrane fouling

产品特点

Product features

人机对话、运行稳定、水质可靠

Man machine dialogue, stable operation and reliable water quality

进水要求：

Water inlet requirements:

以下是保证 EDI 正常运行的条件。为了使系统运行效果更佳，系统设计时应适当提高这些条件。

The following are the conditions to ensure the normal operation of EDI. In order to make the system work better, these conditions should be properly improved in system design.

★给水：RO 纯水，一般水的电导率为 4-30us/cm。

Water supply: RO pure water, the conductivity of general water is 4-30us / cm.

★PH：5.0-8.0(在此 PH 条件下，水硬度不能太高)

★ pH: 5.0-8.0 (under this pH condition, the water hardness should not be too high)

★温度：5-35℃

Temperature: 5-35 ℃

★进水压力：为 4kg/cm2(60psi)，小为 1.5kg/cm2(25psi)。

Water inlet pressure: 4kg / cm2 (60psi), 1.5kg/cm2 (25psi).

注意：组件压力损失取决于流量和水温。

Note: component pressure loss depends on flow and water temperature.

EDI 组件标准配置：

EDI component standard configuration:

★出水压力：浓水和电极水的出口压力必须低于产品的出口压力。

Outlet pressure: the outlet pressure of concentrated water and electrode water must be lower than that of the product.

★硬度（以 CaCO3 计）：为 1.0ppm，建议采用 0.1ppm。

Hardness (based on CaCO3): 1.0ppm, 0.1ppm is recommended.

★物：为 0.05ppm (TOC)。

05 ppm (TOC).

★氧化剂：为 0.05ppm（CL2），0.02ppm（03）建议两者都没有。

The oxidant: 0.05ppm (Cl2) and 0.02ppm (03). It is recommended that there is neither.

★变价金属：为 0.01 ppm (Fe)。

Variable metal: 0.01 ppm (FE).

★二氧化硅：50-150ppb。

Silica: 50-150ppb.

★二氧化碳 CO2 的总量：二氧化碳含量和 PH 值将明显影响产品水电阻率。在大于10ppm 时，一般应在 EDI 设备前安装脱气装置。

Total amount of carbon dioxide: carbon dioxide content and pH value will significantly affect the water resistivity of the product. When more than 10ppm, degassing device should be installed in front of EDI equipment.

五、设备优点

5、 Equipment advantages

1、占地空间小，省略了混床和再生装置。

1. The space occupied is small, and the mixed bed and regeneration device are omitted.

2、产水连续稳定，出水质量高，而混床在树脂临近失效时水质会变差。

2. The produced water is continuous and stable, and the effluent quality is high, while the water quality of mixed bed will become worse when the resin is near failure.

3、运行费用低，再生只耗电，不用酸碱，节省材料费用。

3. The operation cost is low, the regeneration only consumes electricity, does not need acid and alkali, saves the material cost.

4、环保效益，增加了操作的安全性。

4. Environmental protection benefits, increase the safety of operation.

5、不需要酸碱化学试剂来再生(绿色环保)。

5. No acid-base chemical reagent is needed for regeneration (green environmental protection).

6、与同类进口产品比，能耗下降30%左右，节约运行费用。

6. Compared with similar imported products, the energy consumption is reduced by about 30% and the operation cost is saved.