Central Region Wastewater System Corrosion Master Plan, Trinity River Authority of Texas

The Trinity River Authority owns and operates the Central Regional Wastewater System (CRWS), a large regional collection and treatment system serving over one million residents of 20 cities in the Dallas / Fort Worth metropolitan area. A complex series of individual city collection systems delivers wastewater to the CRWS interceptor system. The Authority has been battling H2S corrosion for decades through a series of odor control, chemical feed, rehabilitation, replacement, and corrosion protection initiatives. The CRWS Corrosion Management Plan (CMP) takes a comprehensive, risk-based look at H2S and other potential corrosion conditions throughout the CRWS to develop a targeted program for corrosion prevention and protection. The CMP Project began with a field-monitoring program to quantify corrosion potential and levels of corrosion in the wastewater interceptor system and at the treatment plant. A pilot study was also conducted to demonstrate the effectiveness of Peroxide Regenerated Iron-Sulfide Control technology (PRI-SCâ„¢) on the CRWS Mountain Creek Interceptor System. This successful study provided input in recommendations for expansion of the chemical feed system program to further protect the interceptor system. A risk-based approach was used to target critical areas of concern and to recommend replacement or rehabilitation of high-risk assets. The plan prioritized over $100 million in asset replacement or rehabilitation projects in a long-term renewal plan.