(a) Unless designed for advanced nutrient removal,
an aeration basin must be designed to maintain a minimum dissolved
oxygen concentration of 2.0 milligrams per liter (mg/l) throughout
the aeration 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 for New Wastewater Treatment
Facilities).
(b) The volume of aerated influent wastewater channels
and aerated mixed liquor transfer channels of an activated sludge
system may be used to meet aeration basin volume requirements, provided
the activated sludge 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; amended to be effective December 4, 2015, 40 TexReg 8254