sodium metabisulfite uses in water treatment


sodium metabisulfite uses in water treatment

sodium sulfite

sodium sulfite solution

Sodium Metabisulfite Reducing Agent in Water Treatment

1. Sodium metabisulfite is a reducing agent, which is used to treat chromium-containing wastewater in sewage treatment

2. Chromium-containing wastewater must be treated separately according to the national standard and cannot be discharged into a comprehensive tank, and the concentration of hexavalent chromium shall not be higher than 0.1.

3. Therefore, the drop point of sodium metabisulfite is in raw water containing chromium wastewater, where hexavalent chromium is reduced to trivalent chromium for precipitation

Sodium metabisulfite is a white or yellowish powder used in wastewater treatment. It has the effect of reducing under acidic conditions, but does not have the effect of removing heavy metals.Sodium sulfide is a red or reddish-brown flake that is also reductive and effective at removing heavy metal ions.When used under alkaline conditions, it can form sulfide precipitation with heavy metal ions in wastewater to achieve the purpose of removal.

Sodium sulfide and sodium metabisulfite are generally used for the wastewater treatment of electroplating industry. For example, the wastewater containing hexavalent chromium can be treated by adding sodium metabisulfite first. After the full  sodium metabisulfite reaction reduction reaction, adding polyaluminium chloride or polyferric sulfate flocculant through alkali adjustment and finally adding sodium sulfide to remove the unfinished heavy metals.As the water quantity and quality produced by wastewater treatment industry are different, two or more agents are generally used for treatment, and the adding sequence of agents can be determined through experiments.

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