APDs at the Columbus Southerly WWTP Agenda Introduction and plant overview History of the Acid Phase Digesters Decision making process Condition assessment Alternatives evaluation Sciencebaseddatadriven design approach ID: 1042528
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1. Challenges of Recommissioning the APDs at the Columbus Southerly WWTP
2. AgendaIntroduction and plant overviewHistory of the Acid Phase DigestersDecision making processCondition assessmentAlternatives evaluationScience-based/data-driven design approachProject elementsConclusions/questions
3. Key Takeawaysxx
4. Southerly Wastewater Treatment Plant OverviewCurrent Operating Conditions114 MGD Average Daily Flow330 Peak Wet Weather FlowCEPT will increase Peak Wet Weather flow to 440 (Sept ’19)
5. SWWTP Digestion Train2 Sludge Storage Tanks3 Acid Phase Digesters (APD)6 Methane Phase Digesters (MPD)5 floating cover tanks (1-5)Digester 6 is a fixed steel cover
6. The Southerly Acid Phase DigestersInstalled as part of S66 in 200XEach tank holds 353,800 galDesigned for an SRT of 1.4 days
7. The Southerly Acid Phase DigestersOperated as Acid Phase Digesters for XX yearsOperated at an average SRT of 4 daysConverted to storage tanks and removed from gas systemAcid Phase Digesters were to be permanently converted to storage tanks as part of S90.Would allow for additional TPS storage plus a blend tankFoul odor and gasses sent to biofilter
8. What Changed?
9.
10. Old RequirementsIncineration off line in 2015OARS TunnelWet weather expansion (CEPT)New Requirements100% Class B SludgeIncrease in solidsPlan for growth
11. Solids Mass Balance Update
12. Findings
13. Condition Assessment
14. Gas Sampling
15. Previous EvaluationsCondition assessment of existing assets3D scanning of existing facilitiesSludge rheology testingDigester grit characterization
16. Condition Assessment
17. 3D Scanning
18. 3D Scanning
19. Grit Characterization
20. Rheology Testing
21. Rheology Testing
22. Phase 1 – Digester Process Expansion
23. Phase 1 – Digester Process Expansion
24. Phase 1 – Surface Withdrawal
25. Phase 2 – Rehab APDs
26. Phase 2 – APD/MPD Expansion
27. Phase 2 – Other Process ImprovementsFOGNutrient RemovalFood Waste
28. SummaryWet weather events impact solids stream too!A holistic evaluation that includes solids disposal diversity/risks as well as process capacity is needed to determine the most cost-effective solids management approach.Engagement with plant operations and maintenance staff throughout design provides critical input to identify areas of concern and collective buy-in with process and operational changes.Leverage science-based/data-driven design approaches for defensible decision making.Digester Expansion Project should be bidding within the next month~$20M Bid Estimate
29. Questions?