The TRA CRWS Master Plan. Past, Present, & Future of CRWS. Kaylee Dusek, EIT, Garver Matt Jalbert, PE, TRA

Transcription

1 The TRA CRWS Master Plan Past, Present, & Future of CRWS Kaylee Dusek, EIT, Garver Matt Jalbert, PE, TRA

2 TRA operates the largest water resource recovery facility in Texas CRWS N Dallas

3 CRWS currently serves 1.4 million people across DFW

4 The facility began operation in CRWS begins operation 30 MGD

5 CRWS was initially rated for 30 MGD Primary clarifiers N Two-Stage Trickling Filter 30/50 BOD TSS limit Trickling Filters

6 Since 1959, CRWS has undergone numerous upgrades, upratings, and expansions 1959 CRWS begins operation 30 MGD 1974 Interim improvements 45 MGD

7 Interim flow improvements included conventional activated sludge Trinity River Original Stem N Activated sludge basins

8 Phase I/II expanded the facility to 100 MGD 1959 CRWS begins operation 30 MGD Phase I/II expansion 100 MGD 1974 Interim improvements 45 MGD

9 The expansion included primary clarifiers, aerations basins, and final clarifiers Aeration Basins & Final Clarifiers Disinfection EQ Basins Primary Clarifiers N

10 Phase III expansion included a South Plant and tertiary filtration 1959 CRWS begins operation 30 MGD 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

11 Phase III expanded the facility to 135 MGD Tertiary Sand Filters South Plant N

12 CRWS is consistently evolving 1959 CRWS begins operation 30 MGD 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

13 Phase V improvements have implemented selector zone technology Aerobic Zone Anaerobic Zone

14 Tertiary filtration technology is shifting towards cloth media filtration 30 Sand Filters 16 Cloth Media Filters

15 Odor control has also evolved throughout CRWS History Carbon Systems Chemical Wet Scrubbers Wood Chips Ferrous Sulfate

16 Current odor control at CRWS uses single stage bioscrubbers

17 Solids improvements are utilizing existing infrastructure as part of the transition to THP Original Secondary Digester from 1958 Thermal Hydrolysis Process (THP)

18 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

19 2018 Solids Phase IIIB

20 2018 Solids Phase IIIB

21 What does the potential future of CRWS look like?

22 Modeling was used to determine nutrient management should be a part of TRA s long term plan Post Aerobic Digestion Phosphorus Harvesting Chemical Feed

23 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

24 Significant quantities of influent nondispersibles are a growing concern Maintenance Intensive Decreases efficiency of downstream processes $$$

25 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

26 Facility planning isn t only about cool processes Workspace Optimized traffic flow Staffing Projections Parking Lighting Cameras Security

27 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

28 Future studies will identify further optimization Flow management Grit optimization Odor control Process & Hydraulic Modeling

29 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

30 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

31 QUESTIONS?