- (a) Unless designed for advanced nutrient removal, an aeration basin must be designed maintain a minimum dissolved oxygen concentration of 2.0 milligrams per liter (mg/l) throughout the basin at the maximum diurnal organic loading rate determined in §217.32(a)(3) and Figure: 30 TAC §217.32(a)(3) of this title (relating to Organic Loading and Flows).
- (b) An activated sludge system may use the volume in aerated influent wastewater channels and aerated mixed liquor transfer channels to meet aeration basin volume requirements, provided the system uses aeration by diffused air and the diffuser depth conforms to the requirements of §217.155(b)(5)(A) of this title (relating to Aeration Equipment Sizing).
- (c) The use of a contact stabilization system for nitrification is prohibited.
Source Note:The provisions of this §217.151 adopted to be effective August 28, 2008, 33 TexReg 6843.