1. A. Carbon Dioxide Addition. Where liquid carbon dioxide is used, adequate precautions shall be taken to prevent carbon dioxide from entering the plant from the recarbonation process.

   1. 1. Consideration shall be given to the installation of a carbon dioxide alarm system with light and audio warning, especially in low areas.

   2. 2. Recarbonation tanks shall be located outside or be sealed and vented to the outside with adequate seals and adequate purge flow of air to ensure workers safety.

      1. a. Provisions shall be made for draining the recarbonation basin and removing sludge.

2. B. Acid Addition. Design elements for acid addition include the following.

   1. 1. Feed equipment shall conform to Subchapter A “Chemical Application” §201-§209 of this Part.
   2. 2. Adequate precautions shall be taken for operator safety, such as not adding water to the concentrated acid. (see §207 and §209 of this Part).

3. C. Phosphates. The feeding of phosphates may be applicable for sequestering calcium, for corrosion control, and in conjunction with alkali feed following ion exchange softening.

   1. 1. Feed equipment shall conform to Subchapter A “Chemical Application” §201-§209 of this Part.
   2. 2. Stock phosphate solution shall be kept covered and disinfected by carrying approximately 10 mg/L free chlorine residual unless the phosphate is not able to support bacterial growth. Phosphate solutions having a pH of 2.0 or less may also be exempted from this requirement by the state health officer.

Authority Note

AUTHORITY NOTE: Promulgated in accordance with the provisions of R.S. 40:4(A)(8), 40:4.13.D.(1)(2) and 40:5(A)(2)(3)(5)(6)(7)(17).

Historical Note

HISTORICAL NOTE: Promulgated by the Department of Health, Office of Public Health, LR 44:326 (February 2018), effective August 1, 2018.