Water Treatment for Hydrogen Production
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The cost-effective production of green hydrogen inches ever closer to becoming a reality. RODI Systems has joined the effort by becoming a recognized supplier of water purification systems used in the production of hydrogen by electrolysis.
RODI Systems is now engaged with some of the leading suppliers of electrolyzer technology and green hydrogen project developers. Our products and services related to hydrogen production include the following:
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ULTRAPURE TREATMENT AND PURIFICATION SYSTEMS (UPW)
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ULTRAPURE WATER (UPW) FROM UNCONVENTIONAL SOURCESThe use of solar and wind power for the production of green hydrogen often means that project locations are in some of the more barren and water-stressed parts of the world. Even in well-developed areas, water may be in short supply. RODI’s twenty-seven years of experience in treating challenging feed waters allows us to create ultrapure electrolyzer feed from unconventional sources such as:
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ELECTROLYZER LOOP POLISHINGSupplying ultrapure water as makeup to the electrolyzer is only half of the equation in regard to water purification for hydrogen production by electrolysis. It is also necessary to continuously purify (or polish) the ultrapure water that recirculates within the electrolyzer.
RODI Systems has pioneered the use of electrodeionization (EDI) for electrolyzer polishing. Use of EDI for polishing eliminates the use of conventional ion exchange polishing systems which require frequent chemical regeneration or resin exchanges. RODI’s unique EDI polisher design eliminates the waste reject from the EDI polisher by recycling it back to the inlet of the ultrapure water makeup system. Current EDI polishing systems operate up to 40° C. RODI is working with a major EDI module manufacturer in the development of a module that will operate up to 75° C |
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ULTRAPURE WATER DEGASSINGRemoval of unwanted gases from the ultrapure water stream at various points in the hydrogen production process can provide valuable benefits. Removal of hydrogen from the EDI loop polisher reject might be necessary from a safety standpoint before the reject is reused as feed water to the ultrapure makeup system. Removal of nitrogen from the makeup and electrolyzer loop streams can reduce the need for expensive cryogenic processing of the finished hydrogen product.
RODI’s degassing systems utilize state-of-the-art membrane degassing technology to efficiently remove gases while maintaining the purity level of the water being processed. |