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  2. Spent caustic - Wikipedia

    en.wikipedia.org/wiki/Spent_caustic

    The sodium hydroxide is consumed and the resulting wastewater (ethylene spent caustic) is contaminated with the sulfides and carbonates and a small fraction of organic compounds. Refinery spent caustic comes from multiple sources: the Merox processing of gasoline ; the Merox processing of kerosene / jet fuel ; and the caustic scrubbing/Merox ...

  3. Neutralization (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Neutralization_(chemistry)

    In wastewater treatment, chemical neutralization methods are often applied to reduce the damage that an effluent may cause upon release to the environment. For pH control, popular chemicals include calcium carbonate, calcium oxide, magnesium hydroxide, and sodium bicarbonate. The selection of an appropriate neutralization chemical depends on ...

  4. Ion exchange - Wikipedia

    en.wikipedia.org/wiki/Ion_exchange

    Deionizing resin regeneration with sulfuric acid and sodium hydroxide is approximately 20–40% efficient. Neutralized deionizer regeneration wastewater contains all of the removed ions plus 2.5–5 times their equivalent concentration as sodium sulfate. [8]

  5. Water softening - Wikipedia

    en.wikipedia.org/wiki/Water_softening

    A study found the mean concentration of sodium in softened water to be 278 mg/L. [23] In 2 liters of water—the amount of drinking water typically suggested for an average adult, this constitutes about 22% of the recommended sodium intake by the US CDC and may make a difference to those who need to significantly limit their sodium consumption.

  6. Sodium hydroxide - Wikipedia

    en.wikipedia.org/wiki/Sodium_hydroxide

    Sodium hydroxide, also known as lye and caustic soda, [1] [2] is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na + and hydroxide anions OH −. Sodium hydroxide is a highly corrosive base and alkali that decomposes lipids and proteins at ambient temperatures and may cause severe ...

  7. Water purification - Wikipedia

    en.wikipedia.org/wiki/Water_purification

    In April 2007, the water supply of Spencer, Massachusetts in the United States of America, became contaminated with excess sodium hydroxide (lye) when its treatment equipment malfunctioned. [30] Many municipalities have moved from free chlorine to chloramine as a disinfection agent.

  8. Bittern (salt) - Wikipedia

    en.wikipedia.org/wiki/Bittern_(salt)

    Magnesium hydroxide (Mg(OH) 2) can be derived from bittern. [4] Adding an alkaline solution such as sodium hydroxide (NaOH) or lime will cause magnesium hydroxide to precipitate, although lime is not as effective. Slower addition of the alkaline solution results in the precipitation of larger particles that are easier to remove from solution.

  9. Electro-oxidation - Wikipedia

    en.wikipedia.org/wiki/Electro-oxidation

    Simple scheme of the apparatus for electro-oxidation process. The set-up for performing an electro-oxidation treatment consists of an electrochemical cell.An external electric potential difference (aka voltage) is applied to the electrodes, resulting in the formation of reactive species, namely hydroxyl radicals, in the proximity of the electrode surface. [11]

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