The TRA CRWS Master Plan Past, Present, & Future of CRWS Kaylee Dusek, EIT, Garver Matt Jalbert, PE, TRA
TRA operates the largest water resource recovery facility in Texas CRWS N Dallas
CRWS currently serves 1.4 million people across DFW
The facility began operation in 1959 1959 CRWS begins operation 30 MGD
CRWS was initially rated for 30 MGD Primary clarifiers N Two-Stage Trickling Filter 30/50 BOD TSS limit Trickling Filters
Since 1959, CRWS has undergone numerous upgrades, upratings, and expansions 1959 CRWS begins operation 30 MGD 1974 Interim improvements 45 MGD
Interim flow improvements included conventional activated sludge Trinity River Original Stem N Activated sludge basins
Phase I/II expanded the facility to 100 MGD 1959 CRWS begins operation 30 MGD 1975-1978 Phase I/II expansion 100 MGD 1974 Interim improvements 45 MGD
The expansion included primary clarifiers, aerations basins, and final clarifiers Aeration Basins & Final Clarifiers Disinfection EQ Basins Primary Clarifiers N
Phase III expansion included a South Plant and tertiary filtration 1959 CRWS begins operation 30 MGD 1975-1979 Phase I/II expansion 100 MGD 1974 Interim improvements 45 MGD 1990 AAF Exceeds 100 MGD 1988 Fast-track 115 MGD 1993 Phase III expansion to 135 MGD
Phase III expanded the facility to 135 MGD Tertiary Sand Filters South Plant N
CRWS is consistently evolving 1959 CRWS begins operation 30 MGD 1975-1979 Phase I/II expansion 100 MGD 1974 Interim improvements 45 MGD 1990 AAF Exceeds 100 MGD 1988 Fast-track 115 MGD 1993 Phase III expansion to 135 MGD 2008 Uprating 162 MGD 2018 Ongoing projects
Phase V improvements have implemented selector zone technology Aerobic Zone Anaerobic Zone
Tertiary filtration technology is shifting towards cloth media filtration 30 Sand Filters 16 Cloth Media Filters
Odor control has also evolved throughout CRWS History Carbon Systems Chemical Wet Scrubbers Wood Chips Ferrous Sulfate
Current odor control at CRWS uses single stage bioscrubbers
Solids improvements are utilizing existing infrastructure as part of the transition to THP Original Secondary Digester from 1958 Thermal Hydrolysis Process (THP)
Solids Phase IIIB is expanding the existing BFPS Future Solids will have 6 Belt Filter Press Units Solids Phase IIIB removes plate and frame presses
2018 Solids Phase IIIB
2018 Solids Phase IIIB
What does the potential future of CRWS look like?
Modeling was used to determine nutrient management should be a part of TRA s long term plan Post Aerobic Digestion Phosphorus Harvesting Chemical Feed
Resource recovery can mitigate future struvite precipitation THP Sludge Storage Tanks Anaerobic Digestion BFP Biosolids Cake P-Release Tank Centrifuge Pre-Dewatering Centrate Water Partial Filtrate Bypass for Ammonium Supply Biosolids Struvite Harvesting Filtrate Water Return to Liquids Treatment
Significant quantities of influent nondispersibles are a growing concern Maintenance Intensive Decreases efficiency of downstream processes $$$
There are a variety of alternatives that can address the growing concerns New Screens at HW A Modify existing screens at influent pump stations Optimize screens at HW B
Facility planning isn t only about cool processes Workspace Optimized traffic flow Staffing Projections Parking Lighting Cameras Security
Risk Defined By Users Risk vs. cost relationship was utilized in the decision making process Cost vs. Risk Analysis User Defined Level of Acceptable Risk Cost ($) Best Business Case
Future studies will identify further optimization Flow management Grit optimization Odor control Process & Hydraulic Modeling
Whole plant process models & integrated hydraulic models provide quantitative decision tools for the future Whole plant process model Whole plant integrated hydraulic model Plant water Hydraulic model
The future of CRWS is bright because TRA continues to commit to Improving operational efficiency Mitigating potential impacts of future solids processes Investing in aging assets Meeting the needs of the customer cities
QUESTIONS?