Chemical Reactions Using Sulfur Dechlorinating Agents

Irrespective of the type of residual chlorine present, all the species can be represented by a single species by means of the equivalence of chemical reactions. It is convenient to use HOCl to represent all these species. Thus, the chemical reactions using sulfur dioxide as the dechlorinating agent with HOCl representing the residual chlorine species are as follows:

SO2 + H2O ^ HSO- + H+

(17.47)

HSO- + H2O ^ SO2- + 3H+ + 2e-

(17.48)

HOCl + H+ + 2e- ^ Cl- + H2O

(17.49)

SO2 + HOCl + H2O ^ SO2- + Cl- + 3H+

(17.50)

Sodium sulfite is Na2SO3. Thus, the chemical reactions using sodium sulfite as the dechlorination agent are as follows:

Sodium metabisulfite is Na2S2O5. Thus, the chemical reactions using sodium metabisulfite as the dechlorination agent are as follows:

Na2S2O5 + 2HOCl + H2O ^ 2SO4- + 2Na+ + 2Cl- + 4H+ (17.56)

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