- (a) Sampling Points. A design must include a sufficient number of sampling points, including at least one point immediately downstream of an ultraviolet (UV) system, to allow an operator to monitor the system. Sampling points must be identified in the report.
(b) Dissolved Oxygen (DO) Requirement.
- (1) A UV disinfection system must include post-aeration to ensure compliance with DO requirements in the facility's wastewater permit.
- (2) If the wastewater permit requires a minimum DO of 5.0 milligrams per liter or greater, the report must include the calculations that demonstrate how a post-aeration system will meet the minimum DO level.
Source Note:The provisions of this §217.300 adopted to be effective August 28, 2008, 33 TexReg 6843.