Section 217.186 - Nitrifying Rotating Biological Contactors(a) A rotating biological contactor (RBC) system designed for five-day biochemical oxygen demand (BOD5) removal and nitrification of domestic wastewater in a single system must include four stages and have a maximum overall organic loading rate of 1.6 pounds of BOD5 per day per 1,000 square feet of media.(b) A nitrifying RBC must be designed to allow chemical addition if the influent pH is below 7.0 standard units.(c) The engineering report must justify the nitrification rate of a system using calculations.(d) A nitrifying RBC system may be subject to the requirements of § 217.7(b)(2) of this title (relating to Types of Plans and Specifications Approvals).30 Tex. Admin. Code § 217.186
The provisions of this §217.186 adopted to be effective August 28, 2008, 33 TexReg 6843; Amended by Texas Register, Volume 40, Number 47, November 20, 2015, TexReg 8324, eff. 12/4/2015