- (a) A facility designed to provide advanced nutrient removal must specify the process units needed to achieve the permit's effluent limits.
- (b) Biological nutrient removal, membrane filtration, sand filtration, or a combination of these processes may be used for advanced nutrient removal without applying for the executive director's approval under the innovative or nonconforming technology criteria in §217.7(b)(2) of this title (relating to Types of Plans and Specifications Approvals).
(c) If a BNR unit is proposed, the report must include:
- (1) The anticipated food to microorganism ratio in both the anoxic and anaerobic zones;
- (2) The volatile fatty acid recycle ratio; and
- (3) The design of a foaming control system.
- (d) If a chemical addition unit is proposed, it must comply with the requirements in Subchapter K of this chapter (relating to Chemical Disinfection).
- (e) A fixed film and filtration process must comply with the requirements of Subchapter G of this chapter (relating to Fixed Film and Filtration Units).
Source Note:The provisions of this §217.163 adopted to be effective August 28, 2008, 33 TexReg 6843.