Capacity and Sizing of Chlorine (Cl₂) Disinfection and Sulfur Dioxide (SO₂) Dechlorination Systems

1. (a) The capacity of a Chlorine (Cl₂) or a Sulfur Dioxide (SO₂) gas withdrawal system must be based on the peak flow, in compliance with §217.32(a)(1) of this title (relating to Organic Loadings and Flows) and the equation in the following figure:
   Attached Graphic
   
2. (b) The following figure establishes the minimum acceptable design Cl₂ dosage for disinfection:
   Attached Graphic
   
3. (c) A dechlorination system design must include at least one unit of SO₂ gas to dechlorinate at least one unit of Cl₂ gas.

Source Note:The provisions of this §217.272 adopted to be effective August 28, 2008, 33 TexReg 6843.