Texas Administrative Code
Title 30 - ENVIRONMENTAL QUALITY
Part 1 - TEXAS COMMISSION ON ENVIRONMENTAL QUALITY
Chapter 217 - DESIGN CRITERIA FOR DOMESTIC WASTEWATER SYSTEMS
Subchapter G - FIXED FILM AND FILTRATION UNITS
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).