Electrodeionization (EDI) Ultra Pure Water Systems
Electrodeionization (EDI) Ultra Pure Water Systems offer a continuous electrically driven membrane and resin ion separation technology to reach the strict specifications and ultimate conductivity of 10 uS/cm for the semiconductor and pharmaceutical industries. EDI Systems offer a highly effective alternative to mixed bed demineralization to polish water to extremely low levers of dissolved solids.
EDI systems do not require the periodic regeneration and downtime of resin-based treatment approaches and thus can operate continuously. This reduces maintenance and eliminates the need for regeneration chemicals and waste neutralization. Dissolved solids (cations and anions) are contaminants in some industrial processes. They cause scaling and fouling in boiler tubes, inhibiting heat transfer and system efficiency.
Uses
Cleaning the surfaces of semiconductor wafers and liquid crystal panels
Steam generators for power-generating turbines
Injection water for the healthcare and pharmaceutical industries
Blank water for microanalysis, which affects analysis results
Benefits
Provides extremely low total dissolved solids
Modular units that can be combined for larger flow rates
Continuous operation with no regeneration or hazardous chemicals required
Smaller footprint compared to mixed bed demineralization
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Rental and Alternative Delivery
Whether your needs are short-term bridge, emergency or supplemental or long-term system deployment, Newterra has flexible solutions that alleviate the need for major capital expenditure.
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An EDI Water Treatment System is a continuous electrically driven membrane and resin ion separation technology. RO product water from the DELTA RO Unit enters the EDI Module through an inlet valve and enters a stack of cells with cation and anion membranes separated by spacers. On opposite ends of the stack are a cathode and anode – each providing an electrical potential to drive the cations and anions through the respective one-way membranes to a waste channel. The product and waste channels contain a thin layer of mixed bed resin to provide a conductive path to facilitate the process. The result is a highly efficient system that removes all dissolved solids very close to hydrogen’s neutral potential (pH). The purified water is then piped out of the stack. Modules of different flow rates can be plumbed together to provide higher flow rate capacities.
Ultrapure water is water that has been purified to very strict specifications, containing by definition only H20, and H+ and OH– ions in equilibrium. Therefore, ultrapure water conductivity is about 0,055 uS/cm at 25oC, also expressed as the resistivity of 18,2 MOhm.
Various technologies use Ion Exchange Resins (IX) to remove inorganic dissolved solid impurities from feed water, process equipment and steam-generating boilers to prevent scaling and oxidation damage.
The modular, packaged Newterra SeaMega Desalination System offers seawater reverse osmosis (SWRO) from brackish water or seawater, including potable water, boiler feedwater, irrigation and plant process water.
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