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Assessing Plant DBP Performance Using the DBP-CPE

2004 RMSAWWA/RMWEA Annual Conference Grand Junction, Colorado. Assessing Plant DBP Performance Using the DBP-CPE. Warren J. Swanson, P.E. Schmueser gordon meyer, inc. Glenwood Springs Aspen Crested Butte Meeker . Thanks to the Project Team…. Alison Dugan, USEPA, Cincinnati

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Assessing Plant DBP Performance Using the DBP-CPE

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  1. 2004 RMSAWWA/RMWEA Annual Conference Grand Junction, Colorado Assessing Plant DBP PerformanceUsing the DBP-CPE Warren J. Swanson, P.E. Schmueser gordon meyer, inc. Glenwood Springs Aspen Crested ButteMeeker

  2. Thanks to the Project Team… • Alison Dugan, USEPA, Cincinnati • Total System Optimization program • Larry DeMers, Process Applications, Inc., Fort Collins • R. Scott Summers, CU Boulder

  3. This Presentation Will… • Increase awareness of EPA’s optimization efforts • Introduce DBP optimization tools being developed for states and utilities • Hopefully, encourage participation!

  4. Why Optimize? Improve Water Quality in Your Community! Increase Operations Efficiency! Why Not? BoostWorkplaceSatisfaction! EnsureRegulatoryCompliance!

  5. What is a CPE? • Comprehensive • Technical, managerial, financial • Performance • Measured against goals that EXCEED regs • Roots in optimized filter performance • Evaluation • What limits a systems performance? • What control strategies apply? • Can optimization alone achieve goals?

  6. CPE Contexts and Uses • 1) Stand-alone evaluation • By a water utility or its consultant • By a State primacy agency • 2) Part of a larger program • EPA-State area-wide optimization programs

  7. What is a DBP-CPE? • Extension of traditional CPE • Focus: Simultaneous Optimization of • Disinfection • Disinfection By-Products • By nature, it’s scope is system-wide: Raw Water Quality Distribution System WTP

  8. DBP-CPE Components

  9. Optimized DBP Goals (currently draft) • TTHMs and HAA5 • Locational Running Annual Average Basis • TTHMs: 75g/L; HAA5: 55 g/L • Total Organic Carbon (TOC) Removal • Exceed Enhanced Coag.Requirements by 10%

  10. Case Study: City of Winchester, USA •  4.5-mgd conventional plant • 10,000 customers • No Stage 1 DBP Rule compliance issues • Higher than desired DBPs • Stage 2 compliance not a sure bet

  11. KMnO4 River Source Reservoir Source Cl2 Cl2 10-1000 NTU 1.5-4.5 ppm TOC FLOC/ SED CLEAR WELL MEDIA FILTERS RM PACl KMnO4 River Source Dist. Sys. Process Flow Diagram

  12. One of the First Steps: Historical Distribution System DBP Data Analysis

  13. Historical TOC Removal Performance Should be Assessed…

  14. @ Plant Effluent Disinfection Achieved / Required After Pre-Cl2 Segment Historical CT Data Are Very Useful…

  15. Special Study: On-Site DBP Profile Pre-Cl2 Segment Plant Effluent Dist. Sys.

  16. Historical Cl2 Residual Profiling

  17. Special Study: EC Jar Test Consider Secondary Impacts: -> Turb. -> pH -> Sludge

  18. Distribution System Can Be Important Area for DBP Control • TANK ANALYSIS TOOLS • Tank turnover spreadsheet •  Reducing Water Age • Tank mixing spreadsheet •  Reducing Stratification & DBP Excursions • BOOSTER CHLORINATION • Adds to optimization potential

  19. Control Strategies Are a Key Outcome of a DBP-CPE

  20. DBP Capability Assessment Provides Key Information to the Utility… • Even with optimization, can a plant meet the goals? • More challenging question than for a microbial CPE • “DBP Capability Assessment Tool” (DBP-CAT) • Predictive spreadsheet program • Considers major control strategies • Currently being field-tested

  21. Wrap-up • USEPA currently developing DBP optimization tools for States and water utilities • These tools are being developed and field-tested around the country • Project team seeks interested utilities! For more information, contact: warrens@sgm-inc.com Schmueser gordon meyer, inc. Glenwood Springs Aspen Crested ButteMeeker

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