Why Sodium Metabisulfite (SMBS) used as De-Chlorinator?

 Sodium metabisulfite (Na2S2O5) is a white crystalline powder that is commonly used in various industrial applications. It is a salt composed of sodium, sulfur, and oxygen, and is also known as sodium pyrosulfite.

Sodium metabisulfite is a reducing agent, which means it can donate electrons to other substances and cause them to undergo a reduction reaction. It is commonly used in the food industry as a preservative and antioxidant, to prevent the growth of bacteria and the oxidation of food. It is also used in the wine industry as a sterilizing and clarifying agent.

In addition to its applications in the food and wine industries, sodium metabisulfite is also used in photography as a developing agent, in water treatment as a dechlorinating agent, and in various other industrial processes as a reducing agent.

Sodium metabisulfite (Na2S2O5) is commonly used as a dechlorinating agent in water treatment. Chlorine is often used as a disinfectant in water treatment plants, but it can have negative effects on the environment and aquatic life if it is discharged into surface water bodies. Therefore, dechlorination is necessary to remove residual chlorine from wastewater before it is discharged.

Sodium metabisulfite reacts with chlorine and chlorine dioxide to form harmless sulfites and chlorides. The reaction is typically carried out by adding a predetermined amount of sodium metabisulfite to the water being treated, allowing it to react with the chlorine or chlorine dioxide, and then filtering the resulting mixture to remove any solid particles.

The reaction between sodium metabisulfite and chlorine is as follows:

Na2S2O5 + 2Cl2 → 2NaCl + 2SO2 + O2

The reaction between sodium metabisulfite and chlorine dioxide is as follows:

Na2S2O5 + 2ClO2 → 2NaCl + 2SO2 + O2

Overall, sodium metabisulfite is an effective and relatively inexpensive dechlorinating agent that is commonly used in water treatment processes to remove residual chlorine or chlorine dioxide from wastewater.

However, it is important to note that sodium metabisulfite can be harmful if ingested or inhaled, and can cause skin irritation and respiratory problems. It should be handled with care and used in accordance with safety guidelines.


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