What is the purpose of adding sodium hydroxide in the acidic water stripping unit?
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What is the main purpose of adding sodium hydroxide to the acidic water stripping unit? From which tray level should it be introduced? Why?
Reduce ammonia nitrogen in purified water.
Sodium hydroxide is added to decompose the fixed ammonium salts, and the inlet is generally located in the upper part of the tower.
The acid water treatment system can effectively remove complexed ammonia from wastewater by using an alkali injection process. The theoretical basis for this is that adding an appropriate amount of alkali to the acid water stripping tower promotes the decomposition of fixed ammonium salts; as a result of the addition of alkali, the OH- concentration in the system increases, allowing the ionic form of NH4+ (ammonium) that can be stripped away by steam to be converted into the molecular form of NH3·H2O (ammonium molecules) that can also be stripped away by steam； In the molecular form NH3·H2O, NH3 is stripped off, the fixed ammonium is removed, and waste alkali slag is fed into the stripping tower to provide OH-.
Reduce solid ammonia and improve the quality of purified water
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To remove fixed ammonia, injection is generally carried out from around layer 40
Deamination, but an excess will increase sulfur content.