Hexavalent chromium-containing waste water treatment method
A technology for wastewater treatment and hexavalent chromium, which is applied in water/sewage multi-stage treatment, neutralized water/sewage treatment, reduced water/sewage treatment, etc. The problem of large dosage of solid ferrous sulfate, etc., achieves the effect of less slag and convenient treatment
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[0036] Embodiment 1: Chromium-containing wastewater treatment method is:
[0037] ①Add industrial sulfuric acid with ρ=1.84mg / mL in the reaction tank, according to the calculation formula G 1 =D×Q Calculate the acid dose and add it carefully and slowly;
[0038] where: G 1 : Acid dose, kg
[0039] D: per m 3 The amount of acid required for wastewater is 0.3 ~ 0.4kg / m 3
[0040] Q: Total volume of wastewater
[0041] 2. Add sodium metabisulfite in the reaction tank, and add it according to the weight ratio of sodium metabisulfite to hexavalent chromium ion at a dosage ratio of 3.5:1, so that the hexavalent chromium in the chromium-containing wastewater is reduced to trivalent chromium;
[0042] ③ Add sodium hydroxide to the neutralization tank to make the trivalent chromium completely form chromium hydroxide precipitation, and add sodium hydroxide according to the following formula:
[0043] G2=T×Q
[0044] In the formula: G2: the mass of caustic soda to...
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