Metro District s Phosphorus Initiative Finding the Most Effective and Sustainable Management Approach for Phosphorus

Transcription

1 Metro District s Phosphorus Initiative Finding the Most Effective and Sustainable Management Approach for Phosphorus

2 Integrated Plan Regulatory Phosphorus Initiative Technology /Science Regs Tech. Science 2

3 Evaluation of Performance and Greenhouse Gas Emissions for Plants Achieving Low Phosphorus Effluents Christine debarbadillo, James Barnard, Mario Benisch, Michael Falk Vol. 15, 2016, DOI: /

4 The Problem: Why phosphorus is regulated The Cost of Compliance: Financial incentive to figure our way through this The Current Plan Environmental and social reasons for innovation 12 Studies 4

5 Watershed View Reg. 31 South Platte River Barr-Milton Total Maximum Daily Load 5 Percent of phosphorus in South Platte River at State line Current annual phosphorus loading

6 Prioritizing Phosphorus Regulation Water Quality Timing Barr-Milton Total Maximum Daily Load Reg. 85 Reg. 31 Effluent Phosphorus, lb/day 2,500 2,000 1,500 1, mg/l as measured in Milton Reservoir 1.0 mg/l discharged to the South Platte River 0.17 mg/l as measured in the River In effect Effective Milton Reservoir Effluent Quality, mg/l 6

7 Remove Phosphorus from Wastewater

8 Three P-Removal Steps Biological Phosphorus Removal Filtration Flocculation/Sedimentation 8

9 Cost-Benefit Capital Cost ($ Mil) Effluent Phopshorus (lb/day) $318M Floc Sed/Filters = $3,042 2,168 Filters = $624 $198M Bio P = $56 1,084 0 $22M Effluent Phosphorus Concentration, mg/l

10 Biological Phosphorus Removal Biological Basin without Bio P 10 Biological Basin with Bio P

11 Phosphorus Accumulating Organisms (PAOs) 11

12 Initiative Studies/Goals Biological Removal 1. Full-scale Bio-P Performance 2. Carbon Augmentation 3. Fermentation 4. Sidestream Deammonification 5. Sidestream Bio-P WERF Studies 6. North Secondary Clarifiers Gwynnett Cty, GA 12 Reference Installations Adapted from WEF/WERF Study Quantifying Nutrient Removal Technology Performance, 2011 (NUTRIR06k)

13 Cost-Benefit Capital Cost ($ Mil) Effluent Phopshorus (lb/day) $318M 2,168 $198M 1, $22M $22M Effluent Phosphorus Concentration, mg/l

14 Tertiary Facilities Flocculation & Sedimentation Complex Filter Complex 14

15 Initiative Studies/Goals $318M Chemical flocculation sedimentation plus filters Gwynnett Cty, GA 15 Reference Installations Adapted from WEF/WERF Study Quantifying Nutrient Removal Technology Performance, 2011 (NUTRIR06k)

16 Initiative Studies/Goals $198M Particle Capture (2018) Pilot Evaluation Filters of Tertiary Technology Options Gwynnett Cty, GA 16 Reference Installations Adapted from WEF/WERF Study Quantifying Nutrient Removal Technology Performance, 2011 (NUTRIR06k)

17 Initiative Studies/Goals Watershed Studies 1. Watershed-based management Strategies 2. Bioavailability of Nutrient Fractions Gwynnett Cty, GA 17 Reference Installations Adapted from WEF/WERF Study Quantifying Nutrient Removal Technology Performance, 2011 (NUTRIR06k)

18 Manage Phosphorus Once It s Removed Colorado Phosphorus Index

19 Three P-Management Steps ACCUMULATE RELEASE RECOVERY Influent wastewater Bio P organisms 250 mg/l of P Costs Benefits Low P effluent 19 Adapted from WERF Project NTRY1R12 A new recovered resource

20 RECOVERY Phosphorus Recovery Evaluation Criteria Enhance mainstream Bio-P reliability Mitigate nuisance struvite on equipment/pipes Achieve chemical and energy savings Reduce phosphorus content in biosolids to help nitrogen land application rates Minimize sludge production Recover a resource for society 20 Adapted from WERF Project NTRY1R12

21 RECOVERY Potential Yield 21

22 RECOVERY Initiative Studies/Goals $30 10-Year Present Value Cost $22M Costs ($ millions) $20 $10 Phosphorus Management $17M $16M $16M ( ) $12M Phosphorus Recovery Evaluation $15M $0 Ferric (conventional) Magnesium Reactor Vendor A Vendor B Vendor B (option) Vendor C 22 Non-Recovery Options Recovery Options

23 Phosphorus Accumulating Organisms (PAOs) K + Mg 2+ K + Mg 2+ 23

24 RELEASE Initiative Studies/Goals Phosphorus Management (2016) Struvite Reduction Dewaterability Improvements Evaluation STRUVITE FILLING DIGESTERS DEWATERING PERFORMANCE

25 RECOVERY Phosphorus Management (2016) Struvite Reduction Dewaterability Improvements Evaluation MgCl 2 Before After 6.8ml/L Cake 17.6% 24.6% Polymer 32.2 lb/dt 30.9 lb/dt 25

26 RECOVERY Phosphorus Management (2016) Struvite Reduction Dewaterability Improvements Evaluation Magnesium Ammonium Phosphate (MAP) WAS Primary Sludge Digester

27 Find the Most Effective & Sustainable Management Approach for Phosphorus Minimize Phosphorus Loading to Receiving Waters Do it Cost Effectively and Sustainably Develop an Effective Phosphorus Management Scheme

28 Discussion