Metro Districts Phosphorus Initiative Fin din g th e Most Effective - - PowerPoint PPT Presentation

Metro District’s Phosphorus Initiative

Fin din g th e Most Effective an d Su stain able Man agem en t Appr oach for Ph osph or u s

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Integrated Plan – Regulatory Phosphorus Initiative – Technology /Science

Science Tech. Regs

Evaluation of Perform ance and Greenhouse Gas Em issions for Plants Achieving Low Phosphorus Effluents

Ch r istin e deBar badillo, J am es Bar n ar d, Mar io Ben isch , Mich ael Falk

• Vol. 15, 20 16, DOI: 10 .2166/ 978 178 0 40 6923

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The Problem:

Why phosphorus is regulated

The Cost of Compliance:

Financial incentive to figure

• ur way through this

The Current Plan

Environmental and social reasons for innovation

12 Studies

Watershed View

Percent of phosphorus in South Platte River at State line Current annual phosphorus loading

• Reg. 31 – South Platte River

Barr-Milton Total Maximum Daily Load

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Prioritizing Phosphorus

Milton Reservoir

Regulation Water Quality Timing Barr-Milton Total Maximum Daily Load 0.1 mg/L as measured in Milton Reservoir In effect

• Reg. 85

1.0 mg/L discharged to the South Platte River Effective 2017

• Reg. 31

0.17 mg/L as measured in the River 2025 6

500 1,000 1,500 2,000 2,500 2 1 0.2 0.1 Effluent Phosphorus, lb/day Effluent Quality, mg/L

Remove Phosphorus from Wastewater

Three P-Removal Steps

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Biological Phosphorus Removal Filtration Flocculation/Sedimentation

Cost-Benefit

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$22M $198M $318M 2,168 1,084 217 108 2 1 0.2 0.1 Effluent Phosphorus Concentration, mg/L

Capital Cost ($ Mil) Effluent Phopshorus (lb/day)

Bio‐P = $56 Filters = $624 Floc‐Sed/Filters = $3,042

Biological Phosphorus Removal

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Biological Basin without Bio‐P Biological Basin with Bio‐P

Phosphorus Accumulating Organisms (PAOs)

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Initiative Studies/ Goals

Reference Installations Adapted from WEF/WERF Study Quantifying Nutrient Removal Technology Performance, 2011 (NUTRIR06k)

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

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Gwynnett Cty, GA

Cost-Benefit

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$22M $22M $198M $318M 2,168 1,084 542 217 108 2 1 0.5 0.2 0.1 Effluent Phosphorus Concentration, mg/L Capital Cost ($ Mil) Effluent Phopshorus (lb/day)

Tertiary Facilities

Flocculation & Sedimentation Complex Filter Complex

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$318M

Chemical flocculation sedimentation plus filters

Reference Installations Adapted from WEF/WERF Study Quantifying Nutrient Removal Technology Performance, 2011 (NUTRIR06k)

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Initiative Studies/ Goals

Gwynnett Cty, GA

Initiative Studies/ Goals

Reference Installations Adapted from WEF/WERF Study Quantifying Nutrient Removal Technology Performance, 2011 (NUTRIR06k)

$198M

Filters

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Gwynnett Cty, GA

Particle Capture (2018)

Pilot Evaluation of Tertiary Technology Options

Initiative Studies/ Goals

Reference Installations Adapted from WEF/WERF Study Quantifying Nutrient Removal Technology Performance, 2011 (NUTRIR06k)

Watershed Studies

• 1. Watershed-based management Strategies
• 2. Bioavailability of Nutrient Fractions

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Gwynnett Cty, GA

Manage Phosphorus Once It’s Removed

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Colorado Phosphorus Index

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Three P-Management Steps

ACCUMULATE

• Bio‐P organisms

RELEASE

• 250 mg/L of P

RECOVERY

• Costs
• Benefits

Influent wastewater Low P effluent A new recovered resource

Adapted from WERF Project NTRY1R12 19

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

RECOVERY Adapted from WERF Project NTRY1R12 20

Potential Yield

RECOVERY 21

Initiative Studies/ Goals

RECOVERY 22 $22M $17M $16M $16M $12M $15M $0 $10 $20 $30 Ferric (conventional) Magnesium Reactor Vendor A Vendor B Vendor B (option) Vendor C

10-Year Present Value Cost

Costs ($ millions)

Non-Recovery Options Recovery Options

Phosphorus Management

(2015-2016)

Phosphorus Recovery Evaluation

Phosphorus Accumulating Organisms (PAOs)

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K+ Mg2+ K+ Mg2+

DEWATERING PERFORMANCE STRUVITE FILLING DIGESTERS

Initiative Studies/ Goals

RELEASE

Phosphorus Management (2016)

Struvite Reduction Dewaterability Improvements Evaluation

RECOVERY 25

Before After

MgCl2

6.8ml/L

Cake

17.6% 24.6%

Polymer

32.2 lb/DT 30.9 lb/DT

Phosphorus Management (2016)

Struvite Reduction Dewaterability Improvements Evaluation

RECOVERY

Magnesium‐Ammonium‐Phosphate (MAP)

Phosphorus Management (2016)

Struvite Reduction Dewaterability Improvements Evaluation Digester Primary Sludge WAS

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

Discussion