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  2. Electrodeionization - Wikipedia

    en.wikipedia.org/wiki/Electrodeionization

    Electrodeionization (EDI) is a water treatment technology that utilizes DC power, ion exchange membranes, and ion exchange resin to deionize water. EDI is typically employed as a polishing treatment following reverse osmosis (RO), and is used in the production of ultrapure water. It differs from other RO polishing methods, like chemically ...

  3. Capacitive deionization - Wikipedia

    en.wikipedia.org/wiki/Capacitive_deionization

    where R is the gas constant (8.314 J mol −1 K −1), T the temperature (K), Φ v,fresh, the flow rate of the fresh water outflow (m 3 /s), C feed the concentration of ions in the feed water (mol/m 3) and C fresh the ion concentration in the fresh water outflow (mol/m 3) of the CDI cell.

  4. Electrolysed water - Wikipedia

    en.wikipedia.org/wiki/Electrolysed_water

    This "acidic electrolyzed water" can be raised in pH by mixing in the desired amount of hydroxide ion solution from the cathode compartment, yielding a solution of Hypochlorous acid (HOCl) and sodium hydroxide (NaOH). A solution whose pH is 7.3 will contain equal concentrations of hypochlorous acid and hypochlorite ion; reducing the pH will ...

  5. Electrodialysis - Wikipedia

    en.wikipedia.org/wiki/Electrodialysis

    When fed with low TDS feed (e.g., feed purified by RO), the product can reach very high purity levels (e.g., 18 MΩ-cm). The ion-exchange resins act to retain the ions, allowing these to be transported across the ion-exchange membranes. The main usage of EDI systems are in electronics, pharmaceutical, power generation, and cooling tower ...

  6. Electrolysis of water - Wikipedia

    en.wikipedia.org/wiki/Electrolysis_of_water

    Pure water has a charge carrier density similar to semiconductors [12] [page needed] since it has a low autoionization, K w = 1.0×10 −14 at room temperature and thus pure water conducts current poorly, 0.055 μS/cm. [13] Unless a large potential is applied to increase the autoionization of water, electrolysis of pure water proceeds slowly ...

  7. Water ionizer - Wikipedia

    en.wikipedia.org/wiki/Water_ionizer

    Despite being described as 'water ionizers', the machines are designed to work as water electrolyzers. [3] This is an electrochemical process in which water is split to form hydrogen and oxygen by an electric current. [1] [18] In some machines, the process produces calcium hydroxide and hydrochloric acid through the use of an ion-exchange ...

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