La. Admin. Code tit. 51 § XII-1141

Current through Register Vol. 50, No. 11, November 20, 2024

Section XII-1141 - Recycling Provisions

A. Applicability. All public water systems having treatment plants which utilize surface water or GWUDISW that employ conventional filtration treatment or direct filtration treatment and that recycle spent filter backwash water, thickener supernatant, or liquids from dewatering processes must meet the requirements in Subsections B through D of this Section.

B. Reporting. A system must notify the Department of Health and Hospitals (DHH) in writing if the system recycles spent filter backwash water, thickener supernatant, or liquids from dewatering processes. This notification must include, at a minimum, the following information:

1. a plant schematic showing the origin of all flows which are recycled (including, but not limited to, spent filter backwash water, thickener supernatant, and liquids from dewatering processes), the hydraulic conveyance used to transport them, and the location where they are re-introduced back into the treatment plant;

2. typical recycle flow in gallons per minute (gpm), the highest observed plant flow experienced in the previous year (gpm), design flow for the treatment plant (gpm), and the DHH-approved operating capacity for the plant where the DHH has made such determinations.

C. Treatment Technique Requirement. Any system that recycles spent filter backwash water, thickener supernatant, or liquids from dewatering processes must return these flows through the processes of a system's existing conventional or direct filtration system as defined in §1103. B or at an alternate location approved by the DHH.

D. Recordkeeping. The system must collect and retain on file recycle flow information for review and evaluation by DHH as follows:

1. copy of the recycle notification and information submitted to the DHH under Subsection B of Section;

2. list of all recycle flows and the frequency with which they are returned;

3. average and maximum backwash flow rate through the filters and the average and maximum duration of the filter backwash process in minutes;

4. typical filter run length and a written summary of how filter run length is determined;

5. the type of treatment provided for the recycle flow;

6. data on the physical dimensions of the equalization and/or treatment units, typical and maximum hydraulic loading rates, type of treatment chemicals used and average dose and frequency of use, and frequency at which solids are removed, if applicable.

La. Admin. Code tit. 51, § XII-1141

Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 35:1246 (July 2009).

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4 (A)(8) and R.S. 40:5 (2)(3)(5)(6)(17)(20).