Optimization in Practice: Case Studies from NEW Water s Phosphorus and TSS Optimization Plans

Transcription

1 WWOA, 51 st Annual Conference October 2017 Optimization in Practice: Case Studies from NEW Water s Phosphorus and TSS Optimization Plans Bruce Bartel, NEW Water Nathan Cassity, Donohue 1

2 Outline 2 Background Phosphorus Optimization TSS Optimization Future/Ongoing Optimization Acknowledgments NEW Water Phil Mentink Pat Wescott Jake Becken Bill Oldenburg Aaron Eichhorst Matt Hooker Jon Strandberg Corey Evers CPE Services John Esler Tim Miller Donohue Andrew Dow

3 Background 2014 permit renewal Combined permit for Green Bay Facility and De Pere Facility Part of Lower Fox River TMDL Included mass allocation limits for P and TSS Included 9 year compliance schedule 3

4 Background NEW Water s Permit Compliance Reports Operational Evaluation Report Due: June 2015 Status Report #1 Due: June 2016 Status Report #2 Due: June 2017 Operational Evaluation Report Amendment Due: Dec 2017 Pre- Compliance Alternatives Plan Due: March 2018 Status Report #4 Due: June 2018 Final Compliance Alternatives Plan Due: Dec 2018 We are here 4

5 Green Bay Facility (GBF) Design: 49 MGD Current: 32 MGD North Final Clarifiers South Final Clarifiers North Aeration Basins Primary Clarifiers South Aeration Basins 5

6 De Pere Facility (DPF) Design: 10 MGD Current: 8 MGD Final Clarifiers Intermediate Clarifiers Tertiary Filters Aeration Basins 6

7 Phosphorus Combined DPF + GBF 6-month Average Limit: 68 lbs/day 7

8 TSS Combined DPF + GBF Monthly Average Limit: 2,404 lbs/day 8

9 Optimization Strategy Overall Strategy: Optimize Biological Performance Minimize Soluble Phosphorus Discharge Minimize Biological Causes of Poor Settling Identify/Evaluate Potential Clarifier Performance Improvements Adapt to R2E2 Changes Use Biological Optimization and Trouble-Shooting Tools Use Supplemental Chemical Polishing as Needed Optimize Solids Removal (Minimize TSS and TP) 9

10 Phosphorus Optimization 10

11 P Optimization Highlights Facility Modifications (Aeration Basin Selectors) Aeration Basin Profile Sampling Phosphorus Speciation Data Collection 11

12 12 Facility Modifications

13 Selector Sizing Modifications Phosphorus Action Item (GBF) Goal: Measure phosphorus performance impact of increasing selector size (additional zone) Original selectors: North Plant Basins: 1 zone each, 2 mixers per zone South Plant Basins: 1 zone each, 1 mixer per zone Selector Additions: North Plant Basins: Additional larger zone, 4 mixers each South Plant Basins: Additional larger zone, 2 mixers each 13

14 Selector Sizing Modifications North Plant NEW South Plant 14

15 Measuring Facility Modification Impacts Modified and Un-Modified Basin Operating Simultaneously 15

16 North Complex Performance Modified Basin Put in Service 16

17 South Complex Performance Modified Basin Put in Service 2 17

18 Aeration Basin Profile Sampling 18

19 Basin Profile Sampling Phosphorus Action Item (GBF) Goal: Develop EBPR trouble-shooting tool P Release Ratio: Selector P/Influent P 19 Soluble Phosphorus (mg/l) P Release: Endogenous Activity Basin Length Parameters of Interest: Soluble P Ammonia Nitrate/Nitrite Alkalinity

20 December Phosphorus Profiles 1 2 Middle Middle End End

21 January Phosphorus Profiles 1 2 Middle Middle End End

22 22 December Nitrogen Profiles

23 23 January Nitrogen Profiles

24 24 Phosphorus Speciation

25 Phosphorus Speciation Background Phosphorus Optimization Action Item Goals: Prioritize strategies for improved phosphorus removal based on the forms of phosphorus in the effluent (soluble vs. particulate, reactive vs. non-reactive) Measure impacts of upgrades or piloted improvements Document phosphorus speciation profiles in collection system and among industrial contributors to identify potential source reduction priorities 25

26 Phosphorus Speciation Background Light green: Settle/filter Dark green: Settle/filter Dark blue: Conversion to PP Red fraction: Difficult to remove 26

27 27 July 2016 Effluent Speciation

28 Significant Industrial User Speciation SIU Focus, 3 Days of Composite Sampling: 28

29 SIU Next Steps Talk with top contributors (SIUs) to determine sources of phosphorus Identify pollution prevention strategies for phosphorus reduction 29

30 30 Clarifier Field Testing

31 Clarifier Testing Background TSS Optimization Action Item Goal: Identify hydraulic improvements through field testing to improve clarifier performance (TSS performance) Results of testing used to identify potential clarifier improvements 31

32 Clarifier Field Evaluation CPE Services John Esler founder and president Specializes in clarifier field evaluations Author of Field Testing Chapter 7 WEF MOP FD-8 32

33 Green Bay Facility Clarifiers #6 #5 North Plant Clarifiers #5 & #6 South Plant Clarifier #4 33

34 Field Tests Conducted in April 2016 Timed to fall during elevated spring flows Dye Tracer Tests Drogue Current Tests Dispersed/Flocculated Suspended Solids (DSS, FSS) Vertical Solids Profiles 34

35 35 Dye Tracer Tests

36 36 Dye Tracer Tests

37 37 Dye Tracer Tests

38 38 Drogue Current Measurements

39 39 Drogue Current Measurements

40 40 Vertical Solids Profiles

41 North - Dye Tracer Test Results Imbalance in launders 41

42 North - Dye Tracer Test Results North Plant Clarifier No. 5: Outside weirs favored at elevated flow 42

43 Drogue Current Measurements 43 North Plant Clarifier No. 5 at elevated flow: strong density currents

44 Potential Improvements North Identified Performance Characteristic Density currents: shortcircuiting Out-of-balance launder: short-circuiting Inboard launder: shortcircuiting at perimeter 44 Supporting Field Test Data Drogue current measurements Dye testing results Potential Improvement Increase centerwell diameter to 20-25% Reduce centerwell depth Install energy dissipating inlet Install mid-radius cylindrical baffle Dye testing results Replace launders in Clarifier No. 6 Dye testing results Replace launders with launders attached to outer wall

45 WWOA, 51 st Annual Conference October 2017 Optimization in Practice: Case Studies from NEW Water s Phosphorus and TSS Optimization Plans Bruce Bartel, NEW Water Nathan Cassity, Donohue 45