Biosolids Program Evaluation Walworth County Metropolitan (WalCoMet) - - PowerPoint PPT Presentation

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Biosolids Program Evaluation Walworth County Metropolitan (WalCoMet) - - PowerPoint PPT Presentation

Jan 20, 2024 387 likes •712 views

Biosolids Program Evaluation Walworth County Metropolitan (WalCoMet) Sewerage District Tom Foley, P.E. Omkar Ghavi, P.E. BACKGROUND WalCoMet Background Serves 11 entities including Elkorn, Delavan, Darien, Williams Bay 7.0 MGD/ 20.2

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Biosolids Program Evaluation

Walworth County Metropolitan (WalCoMet) Sewerage District

Tom Foley, P.E. Omkar Ghavi, P.E.

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BACKGROUND

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Walworth County Metropolitan Sewerage District

› Serves 11 entities

including Elkorn, Delavan, Darien, Williams Bay

› 7.0 MGD/ 20.2 MGD › Class “B” liquid land

application

WalCoMet Background

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Walworth County Metropolitan Sewerage District

WalCoMet Background

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Existing Biosolids Process

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Existing Biosolids Program

› Biosolids applied to

WalCoMet owned farm (300 ac) or to nearby farm fields ($)

› Approximately

4,000,000 gallons land applied yearly

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Goals

› Analyze existing program

and alternatives

› Develop financial model › Identify low cost solutions › Provide recommendations

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Biosolids Disposal Issues

› Late harvest jeopardizes

fall land application

› Potential future issues:

– Limited land availability – More stringent regulations – Increased solids production – Rising resource costs

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Alternatives

› Continued liquid land application › Dewatering & land application › Dewatering & landfilling › Class “A” sludge production

– Composting – Lime Stabilization – Heat Drying – Thermophilic Digestion – Thermal Hydrolysis

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Financial Modeling Tool

› Input operating cost parameters › Track costs over 20 year planning period › View costs over time for the modeled

alternatives

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FINANCIAL MODEL DEVELOPMENT

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Financial Model

Finan ancial cial Model

Parameters Parameters & More Parameters

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Financial Model Development

› Financial Model Components

– Process – Economics

› Adjustment to Input Parameters

– Compare Scenarios

› Quantity Costs for Alternatives

– Capital Costs – O&M Costs – Present Value Costs

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Financial Model

Sludge Management

  • Sludge Hauling Scenarios
  • Land Application
  • Land Acquisition
  • Landfilling
  • Outside Haulers
  • Class A Biosolids Revenue

Operating Data

  • Sludge
  • Daily Production
  • Handling
  • Stabilization
  • No. of Units
  • Operating Hours
  • Chemicals

Financial Data

  • Planning Parameters
  • Capital Costs
  • O&M Costs
  • Labor
  • Electricity
  • Fuel
  • Chemical
  • Revenue
  • Escalation
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Financial Model

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Process Model

Process Model

Sludge Production Operational Parameters Treatment Performance

Model Output

  • Annual Solids

(Class A/ Class B)

  • Consumables

(Chemicals, Power, Natural Gas, Fuel, etc.)

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Process Model

Mass Balance

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Model Output

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Model Output

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Model Output

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SCENARIOS

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Liquid Land Application

$- $2,000,000 $4,000,000 $6,000,000 $8,000,000 $10,000,000 $12,000,000 $14,000,000 2016 2018 2020 2022 2024 2026 2028 2030 2032 2034 2036 Cumulative Life Cycle Cost

Year

On Farm Haul <5 mi Haul >5 mi Land Acquisition Outside Hauler

1

2 3 4 5 2 3 4

1

5

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Land Acquisition

$- $2,000,000 $4,000,000 $6,000,000 $8,000,000 $10,000,000 $12,000,000 2016 2018 2020 2022 2024 2026 2028 2030 2032 2034 2036 Cumulative Life Cycle Cost Haul 10 miles Land Acquisition

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Land Acquisition

$- $2,000,000 $4,000,000 $6,000,000 $8,000,000 $10,000,000 $12,000,000 2016 2018 2020 2022 2024 2026 2028 2030 2032 2034 2036 Cumulative Life Cycle Cost Haul 15 miles Land Acquisition

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Liquid vs Solid Application

$- $2,000,000 $4,000,000 $6,000,000 $8,000,000 $10,000,000 $12,000,000 $14,000,000 2016 2018 2020 2022 2024 2026 2028 2030 2032 2034 2036 Cumulative Life Cycle Cost Year On Farm Haul <5 mi Haul >5 mi Land Acquisition Dewatering Landfilling

1 1

2 2 3 3 4 5 6 4 5 6

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Liquid vs Solid Application

$- $2,000,000 $4,000,000 $6,000,000 $8,000,000 $10,000,000 $12,000,000 $14,000,000 2016 2021 2026 2031 2036 Cumulative Life Cycle Cost Dewatering Haul/Land Apply on Farm

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Liquid vs Solid Application

$- $2,000,000 $4,000,000 $6,000,000 $8,000,000 $10,000,000 $12,000,000 $14,000,000 2016 2021 2026 2031 2036 Cumulative Life Cycle Analysis Dewatering (2x Fuel) Haul 15 miles (2x Fuel)

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Liquid vs Solid Application

$- $2,000,000 $4,000,000 $6,000,000 $8,000,000 $10,000,000 $12,000,000 $14,000,000 2016 2021 2026 2031 2036 Cumulative Life Cycle Analysis Dewatering (2x Fuel) Haul 15 miles (2x Fuel) Land Acquisition (2x fuel)

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Class “A” Alternatives

$- $2 $4 $6 $8 $10 $12 $14 $16 $18 $20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Cumulative Life Cycle Cost Millions Year

Option B-1 Liquid Sludge Hauling Option B-2 Dewatering/Solids Hauling Option A-1 Sludge Composting Option A-2 Heat Drying Option A-3 Lime Stabilization Option A-4 Thermophilic Digester Option A-5 Thermal Hydrolysis

B-1 B-2 A-1 A-2 A-3 A-4 A-5

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Recommendations

› Current biosolids program is the lowest cost

and proven option

– Land acquisition and crop rotation will help ensure long term success

› Capital costs of alternatives outweigh

potential savings over a 20 year outlook

› Monitor operation and maintenance costs

using the model to track trends

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› Tom Foley

– tom.foley@clarkdietz.com

› Omkar Ghavi

– omkar.ghavi@clarkdietz.com

Questions?