ELECTRODIALYSIS (ED) AND EDR TEST EQUIPMENT
High Salinity Waters Desalination Pilot Plant
Reverse electrodialysis (RED) or Electrodialysis Reversal (EDR) technology has grown significantly in the last decade, gaining a fast increase in its technology readiness level and now presenting some interesting examples of electrodialysis test equipment and systems.
Thanks to its custom made design, the electrodialysis reversal lab test equipment can be used to test many different wastewaters and find the optimal configuration to scale up Electrodialysis systems to full size projects.
ELECTRODIALYSIS PILOT AND LAB SCALE SYSTEMS EQUIPMENT
The lab scale testing equipment made by YASA ET is designed to treat any kind of high salinity waters by Reverse electrodialysis (EDR) or standard Electrodialysis (ED) technology.
The core part of the testing equipment is a membrane stack made by alternated anionic and cationic membrane layers which can resist to corrosive and highly contaminated liquids. The effect of the treatment can be easily tested right after the open loop or closed loop Electrodialysis (ED) test equipment.
After a couple of minutes the effects of Electrodialysis should be already visible and samples can be collected at different times to gauge the optimal treatment time. Moreover, the voltage can be adjusted so to measure the correct treatment intensity of the pilot Electrodialysis equipment.
ELECTRODIALYSIS REVERSAL FUNCTIONING PRINCIPLE
Electrodialysis is an electrochemical separation process in which ions are transferred through ion exchange membranes by means of a direct current (DC) voltage. The process uses a driving force to transfer ionic species from the source water through cathode (positively charged ions) and anode (negatively charged ions) to a concentrate wastewater stream, creating a more dilute stream.
Electrodialysis selectively removes dissolved solids, based on their electrical charge, by transferring the brackish water ions through a semi permeable ion exchange membrane charged with an electrical potential.
The feed water becomes separated into the following three types of water:
Product water, also known as diluate, which has an acceptably low conductivity and TDS level;
Brine, or concentrate, which is the water that receives the brackish water ions;
Electrode feed water, which is the water that passes directly over the electrodes that create the electrical potential.
EDR is a variation on the standard ED process, which uses electrode polarity reversal to automatically clean membrane surfaces. EDR works the same way as ED, except that the polarity of the DC power is reversed two to four times per hour. When the polarity is reversed, the source water dilute and concentrate compartments are also reversed and so are the chemical reactions at the electrodes. This polarity reversal helps prevent the formation of scale on the membranes. The setup of an EDR testing equipment is very similar to an ED pilot system except for the presence of reversal valves.
ELECTRODIALYSIS REVERSAL (EDR) TEST EQUIPMENT AND LABORATORY SYSTEM FEATURES
The electrodialysis reversal (EDR) test equipment and laboratory system developed by YASA ET offers the following features:
High quality AC power supply with a custom range;
ED membrane stack in different sizes and quality range;
Valves and piping;
Skid mounted components;
The equipment is easy to transport and can be easily shipped all around the world in a timely manner thanks to its light weight and small size.
It can be used for the treatment test of any water or wastewater. For more information kindly get in touch with our team.
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