Industrial treatment method of high-valence chromium wastewater
A treatment method, high-valent chromium technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc. and other problems, to achieve the effect of improving treatment capacity, reducing the production of high-salt wastewater, and achieving obvious treatment effects.
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Embodiment 1
[0017] A method for industrialized treatment of high-priced chromium wastewater, comprising the following steps:
[0018] Under mechanical stirring, add industrial chromium waste water 2000L and water treatment defoamer BYK2kg in the 5000L reactor, (in the industrial chromium waste water, H 2 CrO 4 The concentration is 22690mg / L, H 2 CrO 4 The calculated amount is 45.38kg=2000L*22690mg / L) Stir evenly, add dropwise 57.69kg of 30% hydrazine hydrate (the molar ratio of hexavalent chromium to 30% hydrazine hydrate is 1:0.75), react at 20°C for 0.5h, Add 46.15 kg of sodium hydroxide to precipitate, and filter after the precipitation is complete, separate the precipitate from the supernatant to obtain a clear water phase, and take the supernatant to detect Cr 总 content, C Cr总 = 0.21 mg / L.
Embodiment 2
[0020] An industrial treatment method for high-valent chromium wastewater, the steps are the same as in Example 1, except that the reaction is carried out at 10°C for 0.5h.
Embodiment 3
[0022] An industrialized treatment method for high-valent chromium wastewater, the steps are the same as in Example 1, except that the reaction is carried out at 30°C for 0.5h.
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