Siemens EDI membrane stack (Ionpure? IP-LX membrane stack)
Fig. 1-1: Appearance of Siemens EDI membrane stack IP-LX-Z
The Siemens EDI membrane stack is the core component of the EDI ultrapure water equipment, which is an advanced and environmentally friendly water treatment technology. During operation, it does not generate waste water and is relatively simple to operate and maintain.
A simple EDI membrane stack mainly consists of two electrodes with opposite electrical charges and multiple module pairs. Each membrane module pair includes a fresh water chamber (D-chamber) filled with cation and anion exchange resins, a cationic membrane, an anionic membrane, and a concentrated water chamber (C-chamber). The EDI membrane stack contains multiple such membrane module pairs.
EDI membranes differ from RO (Reverse Osmosis) membranes. RO membranes allow small particles of molecular pollutants and ions, as well as water, to pass through, while EDI membranes, like ion exchange resins, are made of polystyrene material and only allow ions with the appropriate charge to pass through, while water cannot pass through basically.
In an electric field, the water molecules in the feed water are separated into H+ and OH-, which are attracted by opposite charges. H+ moves towards the cathode through the cationic resin, and OH- moves towards the anode through the anionic resin. The flow of water in the concentrated water chamber carries away the cations and anions in the water. The membrane prevents the entry of ions with opposite charges into the fresh water chamber. During the process of water flowing through the fresh water chamber, the ions are removed by the resin, so pure water is generated on the effective side (fresh water chamber) of the membrane.
In addition, the feed water treatment of the EDI membrane stack is very important, as the lifetime, performance, and maintenance of the components depend on the impurity content in the feed water. If better pretreated water is provided to the EDI, the cleaning rate of the components will be reduced. Part of the EDI concentrated water is recirculated, while the other part can be returned to the reverse osmosis feed water, or recovered for other uses or directly discharged to the sewer.
Multiple IP-LX membrane stacks can be connected in parallel in a Siemens EDI membrane stack CEDI system to form a high-flow system. The membrane stack adopts advanced design technology, with small size and easy installation, maintenance, and repair.
1.Siemens EDI membrane stack. There are six different models of IP-LX-Z membrane stack:
model number | Design water yield flow rate m3/h(gpm) | Minimum flow m3/h(gpm) | remark |
IP-LXM04Z | 0.44~0.67 (2.0~3.0) | 0.22(1) | 4 water-producing chamber |
IP-LXM10Z | 1.1~1.65 (5.0~7.5) | 0.55(2.5) | 10 water-producing chamber |
IP-LXM18Z | 2.0~3.1 (9.0~13.5) | 1.1(4.5) | 18 water-producing chamber |
IP-LXM24Z | 2.8~4.2 (12.5~18.8) | 1.4(6.25) | 24 water-producing chamber |
IP-LXM30Z | 3.4~5.1 (15.0~22.5) | 1.7(7.5) | 30 water-producing chamber |
IP-LXM45Z | 5.1~7.7 (22.5~33.75) | 2.55(11.25) | 45 water-producing chamber |
2.Siemens EDI Membrane Stack Ionpure?LX-Z - Industrial CEDI (Continuous Electrodeionization) Membrane Stack
Ionpure?LX-Z - Industrial CEDI Membrane Stack
Produces high-purity water continuously without using chemicals
The LX-Z industrial membrane stack employs the proven and reliable IONPURE? Continuous Electrodeionization (CEDI) technology,
continuously producing water with a quality equal to or better than mixed-bed water, suitable for use in the power, electronics, HPI/CPI, food and beverage industries, as well as laboratory high-purity water production.
Features of the LX-Z Membrane Stack
*Produces water quality equal to or better than mixed-bed water
*Produces water continuously with stable water quality without fluctuations
*Does not require the use of acids/bases, neutralization systems, or resin tanks
*Patented "fully filled" concentrated water chamber, no need for salt addition or concentrated water circulation
*Operates continuously without leaks at 7 bar (100 psi)
*Excellent insulation performance
*Operating costs are much lower than traditional ion exchange
Ionpure?LX-Z Industrial CEDI (Continuous Electrodeionization) Membrane Stack
Operating Environment
Indoor installation, avoiding direct sunlight, with an ambient temperature not exceeding 45°C (113°F)
Quality Standards
CE-certified product. The membrane stack production factory has been certified with ISO9001:2000. Each membrane stack is tested before leaving the factory to meet strict IONPURE and industrial standards.
3. The lowest water quality requirement for Siemens EDI membrane stack
（CO2） The equivalent conductivity of influent water (including CO2 and silicon) | <40μs/cm |
Water inlet source | RO Product water |
Temperature | 5-45℃（40-113°F) |
Inlet pressure | 1.4-7bar（20-100psi） |
（Cl2） Oxidant (calculated as Cl2) | <0.02ppm |
（Fe) | <0.01ppm |
（Mn) | <0.01ppm |
（S2-) | <0.01ppm |
pH | 4-11 |
（CaCO3） | <1.0ppm |
（TOC，C） | <0.5ppm |
（SiO2） | <1.0ppm |
4. The appearance dimensions of Siemens EDI membrane stack
Membrane stack model | Dimensions and specifications | |
L | C | |
LXM04Z | 257.0mm[10.13”] | 146.7mm[5.78”] |
LXM10Z | 346.1mm[13.63”] | 235.6mm[9.28”] |
LXM18Z | 464.0mm[18.30”] | 353.9mm[13.93”] |
LXM24Z | 553.2mm[21.78”] | 442.7mm[17.43”] |
LXM30Z | 665.3mm[26.19”] | 531.1mm[20.92”] |
LXM45Z | 880.4mm[34.66”] | 747.7mm[29.44”] |
5. Typical performance of Siemens EDI membrane stack
operating parameters | |
recovery rate | 90-95% |
Maximum allowable inlet pressure | 7bar(100psi) |
Maximum permissible inlet water temperature | 45℃（113°F) |
Pressure drop range at nominal flow rate | 1.4-2.1bar(20-30psi) |
Water quality of production | |
Product water resistivity | >16MΩ.cm* |
* Note: Actual performance can be measured with Ionpure de IP-Pro Design software determination | |
（SiO2) Silicon (SiO2) removal rate | 90-99%， Depending on the incoming water conditions |
6. Siemens EDI Membrane Stack Flow and Physical Specification
LX-Z Series Membrane Stack | ||||||
order number | Design water production flow rate m3/h(gpm) | Minimum allowable water yield flow rate m3/h(gpm) | DC V | DC A | Transportation weight Kg(lbs.) | Working weight Kg(lbs.) |
IP-LXM04Z | 0.44～0.67(2.0～3.0) | 0.22(1.0) | 0～55 | 0～6 | 68(150) | 45(100) |
IP-LXM10Z | 1.1～1.65(5.0～7.5) | 0.55(2.5) | 0～135 | 0～6 | 91(200) | 68(150) |
IP-LXM18Z | 2.0～3.1(9.0～13.5) | 1.1(4.5) | 0～240 | 0～6 | 100(220) | 77(170) |
IP-LXM24Z | 2.8～4.2(12.5～18.8) | 1.4(6.3) | 0～320 | 0～6 | 113(250) | 91(200) |
IP-LXM30Z | 3.4～5.1(15.0～22.5) | 1.7(7.5) | 0～400 | 0～6 | 123(270) | 100(220) |
IP-LXM45Z | 5.1～7.67(22.5～33.8) | 2.55(11.3) | 0～600 | 0～6 | 145(320) | 122.5(270) |
7.Application of Siemens EDI Membrane Stack:
Chemical water treatment of power plant; ultrapure water for electronics and semiconductor industries; ultrapure water for precision machinery industry; process water for pharmaceutical industry; ultrapure water for laboratory research; water for fine chemicals and advanced subjects; preparation of high-purity water required for other industries.
8. Dimensions and weights of Siemens EDI membrane stack:
Dimensions & Weight | model number | |||||
IP-LXM04Z | IP-LXM10Z | IP-LXM18Z | IP-LXM24Z | IP-LXM30Z | IP-LXM45Z | |
Hight | 60.5cm （23.8 in） | 60.5 cm （23.8 in） | 60.5 cm （23.8 in） | 60.5 cm （23.8 in） | 60.5 cm （23.8 in） | 60.5 cm （23.8 in） |
wide | 32.0 cm （12.6 in） | 32.0 cm （12.6 in） | 32.0 cm （12.6 in） | 32.0 cm （12.6 in） | 32.0 cm （12.6 in） | 32.0 cm （12.6 in） |
long | 25.7 cm （10.13 in） | 34.8 cm （13.7 in） | 46.4 cm （18.3 in） | 55.4 cm （21.8 in） | 66.6 cm （26.2 in） | 88.6cm (34.9 in) |
Working weight | 45.5Kg （100 lbs） | 60Kg （130 lbs） | 77.3Kg （ 170 lbs） | 90.9Kg （200 lbs） | 100Kg （220 lbs） | 124Kg （273 lbs） |
9. Connection of the inlet and outlet of Siemens EDI membrane stack IP-LX
membrane stack interface | specification |
water inlet chamber | 1?" BSP External thread |
Outlet of water production chamber | 1?" BSP External thread |
Concentrated water inlet | ?" BSP External thread |
Outlet of concentrated water chamber | ?" BSP External thread |
10. Siemens EDI membrane stack IP-LX Membrane stack flow rate and pressure difference
membrane stack flow rate | LX-4 | LX-10 | LX-18 | LX-24 | LX-30 | LX-45 | |
m3/h (gpm) | m3/h (gpm) | m3/h (gpm) | m3/h (gpm) | m3/h (gpm) | m3/h (gpm) | bar (Psid) | |
minimum: | 0.22 (1) | 0.6(2.5) | 1.1(4.5) | 1.4(6.25) | 1.7(7.5) | 2.55(11.25) | 0.3-0.7(5-10) |
normal: | 0.44 (2) | 1.1 (5) | 2.0(9) | 2.8(12.5) | 3.4(15) | 5.1(22.5) | 1.4-2.0(20-30) |
The highest: | 0.66 (3) | 1.7(7.5) | 3.1(13.5) | 4.2(18.75) | 5.1(22.5) | 7.65(33.75) | 2.7-3.4(40-50) |
Recovery rate: | 85-95% |
11.Common problems and solutions of EDI module stack:
EDI (Electrodeionization) module stack is an advanced technology commonly used in water treatment to remove ions and impurities from water. However, during use, the EDI module stack may encounter some common problems. The following are some common EDI module stack problems and their possible causes:
1. **Decreased water production**: This may be caused by factors such as too high or too low inlet water pressure, deteriorated water quality (e.g., high hardness or organic pollution), scaling of the module stack, or aging of the module stack.
. **Unstable water quality**: This may be caused by fluctuations in inlet water quality, unstable operating parameters, scaling or aging of the module stack, etc.
3. **Increased pressure drop**: This may be caused by factors such as blockage of the module stack, aging of the module stack, or deterioration of water quality.
4. **Increased energy consumption**: This may be caused by improper operating parameters, scaling or aging of the module stack, deterioration of water quality, etc.
5. **Module stack leakage**: This may be caused by improper installation of the module stack, aging of the module stack, or improper operating parameters, etc.
6. **Decreased performance of the module stack**: This may be caused by factors such as long-term operation, fluctuations in water quality, improper operation, or incomplete cleaning. As the operating time increases, the module stack may experience performance degradation due to pollution, scaling, or blockage, affecting water quality and production volume.
7. **Concentrated water discharge issues**: In some cases, the EDI module stack may produce high-concentration concentrated water discharge. This may be caused by improper operating parameters, poor inlet water quality, or unreasonable module stack design. High-concentration concentrated water discharge may not only cause pollution to the environment but also increase treatment costs.
8. **Power failure**: The normal operation of the EDI module stack requires a stable power supply. If there is a power failure, such as unstable voltage or power outage, it may cause the module stack to fail to operate normally, affecting water quality and production volume.
To address these issues, the following measures can be taken:
* **Regular cleaning**: Clean the EDI module stack regularly to remove dirt and impurities from the surface of the membrane, maintaining its permeability and performance.
* **Optimize operating parameters**: Adjust operating parameters such as inlet water pressure and current density based on inlet water quality and water production requirements to maintain the optimal operating state of the module stack.
* **Strengthen water quality monitoring**: Regularly test and analyze inlet and outlet water to understand changes in water quality, adjust treatment plans in time, and ensure the stable operation of the module stack.
* **Regular maintenance**: Regularly inspect and maintain auxiliary equipment such as power supplies, pipelines, and valves to ensure their normal operation and avoid adverse effects on the module stack.
* **Train operators**: Strengthen training for operators, improve their operational skills and problem-solving abilities, and ensure the safe and stable operation of the module stack.
In conclusion, the EDI module stack may encounter various problems during operation, but through reasonable operation and maintenance, these problems can be effectively solved, maintaining the stable operation of the module stack and good water quality. At the same time, it is also necessary to continuously pay attention to the development of new technologies and materials to improve the performance and lifespan of the EDI module stack.