Carbon is a reducing agent; thus, it follows that when in contact with chlorine it will reduce it to the chloride state. Carbon, itself, will be oxidized to carbon dioxide. The chemical reactions follow:
The unit operation of carbon adsorption is discussed in Part II of this book. The use of activated carbon in dechlorination will use the same unit operation, except that in the present case, the carbon will be consumed by chemical reaction. In the unit operation as discussed in Part II, the operation is purely physical, and carbon can be regenerated, which is also the same case in dechlorination except that there is a large loss of carbon between regenerations.
Example 17.17 A total flow of 25,000 m /d is to be dechlorinated after disinfection using chlorine. Sulfur dioxide is to be used for dechlorination. If the total residual chlorine (TRC) is 0.5 mg/L, how many kilograms per day of sulfur dioxide are needed?
And, from Equation (17.50),
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