Sodium bisulfite
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Sodium bisulfite is a common reducing agent in the chemical industries. As it readily reacts with dissolved oxygen:
2 NaHSO3 + O2 → 2 NaHSO4
It is usually added to large piping systems to prevent oxidative corrosion. In biochemical engineering applications, it is helpful to maintain anaerobic conditions within a reactor. Sodium bisulfite should not be confused with sodium bisulfate which is used as a pH lowering chemical for swimming pools.
In wastewater treatment, sodium bisulfite is often added following disinfection with a chlorine solution to neutralize the residual chlorine before discharging the treated effluent.
Reporting
Reference: ENS 46627
See also