浅EDI进水要求 维护说明

EDI manual instructions EDI

手册说明

1.

Feed water specification

进水标准

Source: RO water, typically 4-40 us/cm -

电导率（切记）

Pressure: 1.5-4 bar -

压力

Temperature: 15-45°

C -

温度

pH: 7-8 for optimum quality - PH

值

Chlorine: <0.05ppm

–

游离氯

Iron, manganese: <0.01ppm

–

重金属，锰

Hardness: <1ppm as CaCO3

–

硬度

Organics (TOC): <500ppb

–

TOC

Silica: <500ppb

–

硅

Carbon dioxide: <5ppm

–

二氧化碳

2.

Removal of EDI EDI

离子去除率

Ions: ±

99.5% -

总离子

Carbon dioxide: >99% -

二氧化碳

Silica: >90%

–

硅

TOC: 60-90%

–

TOC

3.

Features of the RO/EDI RO+EDI

理想指标

Conductivity: 0.055-0.5 us/cm

电导率

TOC: <50ppb

Silica: <10ppb

–

硅

Bacterial: <10cfu/100ml -

细菌

Endotoxins: <0.25EU/ml

–

内毒素

4.

What makes EDI work better

什么使

EDI

工作更好

“

Easy

”

ions in feed water: Na+, CL-, etc

–

进水中加入

Na+

和

CL-

等低价活性离子

Fewer ions in feed water

–

进水中的离子含量越少越好

Proper voltage driving force

–

合适的电压驱动

No oxidizers, no metals, no debris, no organics (TOC)

–

没有氧化物，没有重金属，没有微 生

物，

没有有机物

Good internal pressure balance

–

良好的内部压力平衡

Proper system design

–

良好的系统设计

5.

What makes EDI perform poorly

什么使

EDI

工作更糟

5.1

Oxidizers hurt lifetime (O3, Cl2): will attack resins and membranes.

氧化物损害工作寿命

5.2

Irreversible metal ion adsorption (Fe3+, Mn): may catalyzer resin Oxidation.

重金属使树脂

氧化

5.3

High feed conductivity (inefficient)

高电导率的进水

5.4

V

oltage too high/too low (inefficient)

电压过高

/

过低

5.5

Ions with fluffy charge are hard to remove (CO2 competes with SiO2 and Boron): Lowers the

production resistivity

离子以游离形式存在，造成产水高电导率

5.6

Organic contamination (requires module cleaning): absorbs to resin and membranes.

有机物

污染，吸附在树脂和膜的表面

5.7

High hardness in feed will cause scale (requires module cleaning): may scale the concentrates

compartments (% recovery)

进水高硬度造成结垢

6.

Factors affecting EDI performance

–

影响

EDI

工作表现的因素