Homogeneous membrane electrodialysis technique

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Homogeneous membrane electrodialysis technique

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Homogeneous membrane electrodialysis technique Specification

System Configuration
Stack of membrane cell pairs

Maintenance Requirement
Low; periodic cleaning with acid/base solutions recommended

Membrane Type
Homogeneous ion-exchange membrane

Typical Industries Used
Water treatment, food and beverage, pharmaceuticals, electronics

Installation Requirement
Requires pre-treatment for suspended solids and organics

Membrane Material
Polystyrene sulphonate (cation) or quaternary ammonium (anion)

Feedwater Salinity Limit
Up to 10,000 mg/L TDS

Process Principle
Ionic species selectively migrate through membranes under an electric field

Current Density
10 90 mA/cm

Voltage Range
Typically 1 2 V per cell pair

Leakage Current
Minimal in homogeneous membranes compared to heterogeneous types

pH Range
2 10

System Automation
Can be automated with online monitoring and control systems

Typical Recovery Rate
60 85% depending on feed composition

Operating Temperature
Up to 40C

Application
Electrodialysis desalination and ion separation

Energy Consumption
1.5 5.0 kWh/m depending on feed and operating conditions

Flow Configuration
Parallel flow with alternating diluate and concentrate compartments

Electrode Materials
Platinum-coated titanium or stainless steel

Scale Up Potential
Readily scalable by increasing the number of cell pairs

Membrane Thickness
100 200 m

Lifespan of Membrane
2 5 years with proper maintenance

Ion Selectivity
High selectivity for targeted ions, minimizing co-ion transport

Homogeneous membrane electrodialysis technique Trade Information

Payment Terms
Telegraphic Transfer (T/T), Letter of Credit (L/C)

Sample Available
No

Main Export Market(s)
Asia, Australia, Central America, North America, South America, Eastern Europe, Western Europe, Middle East, Africa

Main Domestic Market
All India

About Homogeneous membrane electrodialysis technique

Homogeneous membrane electrodialysis can meet the processing requirements of various materials and liquids, and has the characteristics of small membrane surface resistance, high current efficiency, low energy consumption, good selectivity and high yield. Mainly used in material separation, small brackish water desalination; For example, the desalination and purification of various amino acids, the decolorization and purification of various fermentation fluids, the desalination of various medical intermediates, and the extraction of oligosaccharides from sorghum stalks, corn stalks, wheat stalks, soybean milk, sugarcane and other plants have significant social and economic benefits.

The homogeneous membrane electrodialysis method can effectively remove all kinds of inorganic salts in the material and achieve a better separation and purification effect. Taking amino acid desalination as an example, compared with heterophase membrane electrodialysis, homogeneous membrane electrodialysis is more superior, the yield of amino acids has been greatly improved, and the current efficiency has also been greatly improved. The amino acid yield can reach more than 94% and the desalting rate can reach more than 99.9%. In addition, the taste of amino acids produced by the homogeneous membrane electrodialysis process is much better than that of other processes, and has been highly praised by customers.

High Ion Selectivity and Recovery Efficiency

Homogeneous membranes in electrodialysis provide advanced ion selectivity, minimizing unwanted ion transport. This results in consistently high recovery rates ranging from 60% to 85%, depending on the composition of the feedwater. The technology efficiently separates and recovers valuable ions, making it a preferred choice in industries demanding precision and purity.

Low Maintenance and Long Membrane Life

Routine maintenance for homogeneous membrane electrodialysis systems is minimal. Operators only need to periodically clean the membranes with acid or base solutions, ensuring longevity and efficient operation. With proper care, these membranes last between 2 and 5 years, optimizing operational costs and minimizing downtime.

Versatility, Scalability, and Reliability

The system accommodates feedwater salinity up to 10,000 mg/L TDS and is readily scalable to suit varying production demands simply by increasing membrane cell pairs. Advanced automation features and minimal leakage current further enhance reliability and process control, establishing it as a robust solution across diverse sectors including water treatment, pharmaceuticals, and food processing.

FAQ's of Homogeneous membrane electrodialysis technique:

Q: How does the homogeneous membrane electrodialysis technique achieve high ion selectivity?

A: The system uses homogeneous ion-exchange membranes that selectively allow target ions to pass through when exposed to an electric field, while minimizing co-ion transport. This selective migration ensures efficient separation and purification, meeting stringent industry standards.

Q: What industries commonly use homogeneous membrane electrodialysis systems?

A: These systems are widely used in water treatment, food and beverage processing, pharmaceuticals, and electronics manufacturing. Their high selectivity, low maintenance, and robust scalability make them suitable for sectors demanding precision ion separation and desalination.

Q: When is periodic maintenance required for these systems?

A: Routine maintenance is low and mainly involves periodic cleaning of the membranes with acid or base solutions. Frequency depends on feedwater quality and operating conditions but regular checks help ensure consistent performance and longer membrane lifespan.

Q: Where can homogeneous membrane electrodialysis systems be installed?

A: These systems are ideal for installations with proper pre-treatment for suspended solids and organics. They are flexible and can be incorporated into new or existing facilities in various industrial settings, ensuring compatibility with diverse processing needs.

Q: What is the process principle behind ion separation in homogeneous membrane electrodialysis?

A: Ion separation is achieved as targeted ionic species migrate selectively through cation or anion exchange membranes under the influence of an electric field, which is typically supplied at a voltage range of 1-2 V per cell pair and current density of 10-90 mA/cm2.

Q: How scalable and energy-efficient is the system?

A: The system is readily scalable by increasing the number of membrane cell pairs, allowing adaptation to different throughput requirements. Energy consumption ranges from 1.5 to 5.0 kWh/m3 depending on feedwater and operating parameters, offering efficient performance relative to conventional ion separation techniques.

Q: What are the main benefits of using homogeneous membrane electrodialysis?

A: Key benefits include high selectivity for targeted ions, minimal leakage current, low maintenance requirements, compatibility with various automation systems, and a lifespan of up to 5 years. These features result in reliable purification and cost-effective operation.

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