To learn: Boulder s WWTF. Nutrients and Carbon. Choosing the Best Carbon for the Job. Updates and Next Steps

Transcription

1

2 To learn: Boulder s WWTF Nutrients and Carbon Choosing the Best Carbon for the Job Updates and Next Steps

3 Raw Influent Primary Influent Primary Effluent A-Basin Effluent RAS Flow MLWAS Flow Secondary Effluent Final Effluent Primary Sludge Thickened Sludge Cake Biosolids

4 Boulder s Current and Future Nutrient Limits NCS nutrient permit summary figure

5 Effluent Nitrate Performance

6 Carbon Limited Denitrification

7 Not all Carbon Total COD is Created Equally Biodegradable COD Nonbiodegradable COD Readily Biodegradable (soluble) Slowly Biodegradable (particulate) NB Soluble NB Particulate Complex VFA Colloidal Particulate

8 Carbon Limited

9 ABI Carbon and Ammonia; Effluent Nitrate for April 1 st and April 2 nd, : Total Organic Carbon, mg/l and Inorganic Carbon, mg/l :30 15:20 11:30 15:40 TOC NH3 SCT Eff NO3 18: Nitrate as N, mg/l and Ammonia as N, mg/l

10 Boulder s Current and Future Nutrient Limits NCS nutrient permit summary figure

11 How to get there

12 How to get there

13

14 Phased Approach WERF, 2010

15 Carbon Sources Considered Cell Media Brewery Weak Wort Methanol Tofu Whey Acetic Acid

16

17 Alternative Carbon Cost ($/lb ffcod) Reliability / availability Quality / purity Methanol MicroC 2000 Pharma. Cell Media Tofu Whey Brewery Weak Wort Acetic Acid (80%) 4 ($0.15) 2 ($0.27) 5 ($N/A) 2 ($0.25) 5 ($0.10) 1 ($0.78) Quality / COD (mg ffcod/l) 5 (1,188,000) 5 (1,040,000) 3 (N/A) 3 (17,750) 3 (43,866) 5 (896,800) Health / safety Handling and Storage Environmental soundness Total Score

18 Life Cycle GHG Emissions Greenhouse Gas Emissions g CO2e/ g CO2e/ g CO2e/L lb ffcod kg ffcod Methanol MicroC Brewery WW Tofu Whey Mark Pitterle, NSEW, Inc., 2013

19 Chemical Characterization: Phase I Analyte Brewery Waste Tofu Whey MicroC2000 Units ph SU Specific Gravity SC TKN N/A (TN) mg N/L Ammonia mg N/L ortho-p mg P/L TP N/A N/A 24.5 mg P/L COD 47,391 22,550 1,040,000 mg/l scod 45,831 20,850 1,040,000 mg/l ffcod 43,866 17, ,000 mg/l NO mg N/L NO mg N/L Total Solids %

20 Chemical Characterization: Phase II

21 Weak Wort Carbon Characterization

22 Bench-Scale Testing: The NUR Test WERF, 2010

23 WERF, 2010

24 Sample NUR Test Results 30 NOx (mg/l as N) Refrigerated Brewery Weak Wort Fraction rbcod/cod = 16% Time (min)

25 Sample NUR Test Results 30 NOx (mg/l as N) Unrefrigerated Brewery Weak Wort Fraction rbcod/cod = 32% Time (min)

26 Bench-Scale Results

27 Full Scale Trial: Target Dose

28 Full Scale Trial Setup Brewery Weak Wort 26 m 3 Storage Tank 9.3 m 3 and 3.8 m 3 Brewery Weak Wort Storage Tanks Location for external carbon injection: Aeration Basin 3 Chimney Baffle MicroC 1 m3 totes, methanol and acetic acid 100-L drums Chemical Feed Pump for Methanol, MicroC and Acetic Acid

29 Full-Scale Trial Monitoring

30 Full-Scale Trial Monitoring Sample Location Wet Chemistry analyses In-situ Measurements RAS NO 3, NO 2, NH 4, scod DO, TSS, ph ABI Channel NO 3, NO 2, NH 4, scod, TKN DO, TSS, ph AB1, Z1 NO 3, NO 2, NH 4, scod DO, TSS, ph AB1, Z2 NO 3, NO 2, NH 4, scod DO, TSS, ph AB1, Z3 NO 3, NO 2, NH 4, scod DO, TSS, ph AB1, Z8 NO 3, NO 2, NH 4, scod, PO 4, TSS DO, TSS, ph AB3, Z1 NO 3, NO 2, NH 4, scod DO, TSS, ph AB3, Z2 NO 3, NO 2, NH 4, scod DO, TSS, ph AB3, Z3 NO 3, NO 2, NH 4, scod DO, TSS, ph AB3, Z8 NO 3, NO 2, NH 4, scod, PO 4, TSS DO, TSS, ph

31 Process Modeling Calibrated dynamic model Centrate return as an input Run as a steady state model

32 Process Modeling Three secondary trains in parallel Four external carbon inputs

33 Process Modeling

34 Full-Scale Performance

35 Decision Brewery Weak Wort Primary Source Locally available Waste as resource Potential for optimization Acetic Acid Chemical Backup Immediately effective Common industrial chemical Consistent strength and quality

36 Protocol Feedback 1. Fraction of rbcod and cost comparison 2. ffcod test procedure

37 What we learned: One facility s experience Bench-scale testing Process modeling Intermittent vs continuous dosing

38 Updates and Next Steps Nitrogen Upgrades Project Avery Brewing Company Permit Compliance (or lack thereof) Logistics

39 Nitrogen Upgrades Project Site Aerial

40 Nitrogen Upgrades Project Base Project Solids Contact Tank Modifications Potable Water Line and Other Associated Site Piping Aeration Basin Modifications External Carbon Storage & Feed Facility Site Civil

41 Nitrogen Upgrades Project Bid Alternates 1. Post Aerobic Digester Conversion and Air Piping 3. Primary Bypass Line 2. Centrate Tank Modifications

42 Avery s IPT Permit Unprecedented exemption for BOD Based on chemical characterization

43 Avery Outfall 001

44 Outfall 001, from Rationale

45 Avery Outfall 002

46 Outfall 002, from Rationale

47 Outfall 002, from Rationale

48 IPT Compliance ph neutralization issues Yeast and hops solid waste Timing for final implementation

49 Acknowledgements Sheri Duren & Ridge Dorsey Scott Weirich Chris Douville Colorado Springs Utilities City of Fort Collins Christopher Bye Tamzen MacBeth Marie Burbano Tanja Rauch-Williams, Jeff Berlin, Becky Luna, Erica Corbett

50 Questions / Comments Cole Sigmon, C.W.P. Wastewater Process Optimization Specialist City of Boulder s 75 th Street WWTF sigmonc@bouldercolorado.gov