浅-wlf
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
6.1
Temperature: T higher, lower stack
resistance
温度：过高过低影响电导率
6.2
Pressure: if
P conc > P dilute, the ions
move from
concentrates to dilute compartments.
压<
/p>
力：如果浓水压力大于产水压力，离子就会转移到产水室中
6.3
Feed
conductivity equivalent (FCE): Higher, lower
product quality.
进水电导率高，产水质
量差
6.4
V
oltage and current: Higher,
better product quality.
电压和电流：越高，水质越好
6.5
Carbon
dioxide: High CO2 level, higher FCE
二氧化碳越高，进水电导越高
6.6
(Bio)fouling:
may result in higher pressure drop in dilute or
concentrate.
生物膜造成产水或
浓水室的
2
侧高压力降
6.7
Scaling: may
result in lower product quality and increasing
pressure drop in concentrate.
结
< br>垢：造成产水的质量下降并且浓缩水的压力降增加
6.8
Torque:
it
is
critical
for
good
EDI
performance.
Avoids
leaks.
Periodic
torque
is
required.
Toque
sequence
is
important.
板手：影响
E
DI
的工作表现，为了防止泄漏，周期性的紧
固是必须的，紧固
的周期是重要的
7.
EDI lifetime
–
EDI
的寿命
Economics: 3 Years
–
一般性维护
8.
Trouble
shooting
–
故障
8.1
Low product
quality
–
产水质量低
8.2
High pressure
drop concentrate: Usually caused by hardness or
silica scaling, sometimes by
biofouling
–
浓缩段压力降大：一般是由于硬度
或硅的结垢造成的，有时候也有生物膜
污染的原因
8.3
High pressure
drop dilute: Usually cause by chlorine attack of
resin.
–
产水段压力降大：
通
常是由于受到游离氯对于树脂的损害
8.4
High pressure
drop concentrate and dilute: Usually caused by
particulate or biofouling.
–
浓缩
水段和产水段的压力降都高：通常是由于微粒或生物膜的污
染
8.5
High internal resistance of module:
Usually caused by Scaling.
–
模块间的电阻大：通常由
于结垢造成
8.6
Testing of
internal leakage: Back pressure method. Set
concentrate pressure 0.3bar higher than
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