Biosolids Drying Systems Can they be part of an energy efficient project?
Biosolids Drying Systems
Feb 03, 2023
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Microsoft PowerPoint - DRAFT_2021 Biosolids PP Website.pptxBiosolids Drying Systems Can they be part of an energy efficient project?
Agenda
Treatment Technology: Thickening Gravity Thickening Flotation Thickening Mechanical Thickening
Advantages
• Simple to design, operate and maintain
• Good performance • Highest performance (4% to 6%)
• Require small to moderate size for working area
• Simple to design and operate
Disadvantages
• Require larger footprint
Advantages
• Simple to design and operate • Requires less energy • Lower operational and chemical
costs
• High performance (20% - 35%) • Adaptable to varying influent solids
conditions • Moderate disposal and hauling costs • Requires small land area • Low capital costs
Disadvantages
conditions • Require periodic excavation and
removal of dewatered sludge -> expensive
• Require large land area
• Requires moderate to significant operator attention
• Two waste streams (filtrate and belt washwater)
Treatment Technology: Drying Open-Air Drying Mechanical Drying
Advantages
• Simple to design and operate • Requires minimal energy input • Lower O&M and chemical costs
• Achieve up to 97% solids • Low disposal and hauling costs • Requires low to moderate land area
Disadvantages
• May require years to achieve the desired solids content
• Require large land area • Lower solids content output
• Higher energy, thermal, and chemical costs
• High capital costs • Two waste streams (filtrate and belt
washwater)
Operating Principle
Benefits
Regulatory Requirements /Guidelines
• Design residuals treatment processes: o 10 States Standard o AWWA Water Treatment Plant Design
• Disposal: o 1972 Clean Water Act (NPDES/USEPA) –
Regulation of Discharges to Natural Waterways, Regulation of Discharge into Sewer Systems
o Subtitle D of the Resource Conservation and Recovery Act (USEPA) – Regulation of Permanent Lagoons and Landfills
o 40 CFR 503 and 40 CFR 507 (ASCE/AWWA/EPA) – Regulation of Land Application
Type of Sludge Quality & Quantity
Disposal Types Available
user loading • Alternate means of disposal during dryer
outages • Reduce costs and provide flexibility in
operation • Daily operations • Final equipment sizing and costs • Fuel source gas cleaning, blending,
compression, safety, and distribution.
Sludge Disposal Savings -$2.1M
Simple Payback 9.1 years
Diesel Fuel Energy Savings
99 Miles of Hauling
234,000 Gallons Diesel Fuel
Landscape Spreading Energy Savings
180 BTU/LB 16 BTU/LB due to Increased % Solids
14,000 mmBTU 500 mmBTU
Case Study:
Project Drivers o Address Failing
Infrastructure o Address Inefficient
What makes a successful project? o Maintain Class A
Biosolids o Eliminate Existing
o Enhanced Septage Receiving
What Are My Options?
Existing Process (Can We Make it More Efficient?)
o Change the Process
Dryer Design Criteria o Utilize Excess Digester
Gas at Dryer o “Future Max Month”
Solids Loading conditions within approximately 40 hours of operation per week
o Disposal to farmers with potential winter storage under existing canopy structure
Sludge Dryer Cost $3.0M (installed) Dryer Fuel & Power Cost -$14,250
Project Savings -$0.3M
exploring the seen
Improvements Implementation Results
Energy, Operational, & Maintenance Costs • Increase Revenue • Integrate Energy Efficiency
into Capital Improvement Programs • Additionally - Meet More
Stringent Regulations
Onondaga County WWTP • A comprehensive ICE evaluation
was performed on the six WWTPs making up the County System
• Over $24.5 million of integrated energy and capital improvements
• Over 6.3 million KWHrs of electrical savings and $2.1M of savings annually
• $2.3 million in energy incentives
• 11.6 year payback
City of North Tonawanda Wastewater Treatment Plant Biosolids Dryer Analysis
Endicott Wastewater Treatment Plant Upgrades Engineering Design & Construction Services
Onondaga County Energy Study & Energy Performance Contract
Town of Amherst Biosolids Dryer Analysis
Village of Gowanda Biosolids Dryer Evaluation
Erie County Water Authority Biosolids Dryer Evaluation
Private Industrial Client Dryer Procurement & Design
Drinking Water Sludge
Agenda
Treatment Technology: Thickening Gravity Thickening Flotation Thickening Mechanical Thickening
Advantages
• Simple to design, operate and maintain
• Good performance • Highest performance (4% to 6%)
• Require small to moderate size for working area
• Simple to design and operate
Disadvantages
• Require larger footprint
Advantages
• Simple to design and operate • Requires less energy • Lower operational and chemical
costs
• High performance (20% - 35%) • Adaptable to varying influent solids
conditions • Moderate disposal and hauling costs • Requires small land area • Low capital costs
Disadvantages
conditions • Require periodic excavation and
removal of dewatered sludge -> expensive
• Require large land area
• Requires moderate to significant operator attention
• Two waste streams (filtrate and belt washwater)
Treatment Technology: Drying Open-Air Drying Mechanical Drying
Advantages
• Simple to design and operate • Requires minimal energy input • Lower O&M and chemical costs
• Achieve up to 97% solids • Low disposal and hauling costs • Requires low to moderate land area
Disadvantages
• May require years to achieve the desired solids content
• Require large land area • Lower solids content output
• Higher energy, thermal, and chemical costs
• High capital costs • Two waste streams (filtrate and belt
washwater)
Operating Principle
Benefits
Regulatory Requirements /Guidelines
• Design residuals treatment processes: o 10 States Standard o AWWA Water Treatment Plant Design
• Disposal: o 1972 Clean Water Act (NPDES/USEPA) –
Regulation of Discharges to Natural Waterways, Regulation of Discharge into Sewer Systems
o Subtitle D of the Resource Conservation and Recovery Act (USEPA) – Regulation of Permanent Lagoons and Landfills
o 40 CFR 503 and 40 CFR 507 (ASCE/AWWA/EPA) – Regulation of Land Application
Type of Sludge Quality & Quantity
Disposal Types Available
user loading • Alternate means of disposal during dryer
outages • Reduce costs and provide flexibility in
operation • Daily operations • Final equipment sizing and costs • Fuel source gas cleaning, blending,
compression, safety, and distribution.
Sludge Disposal Savings -$2.1M
Simple Payback 9.1 years
Diesel Fuel Energy Savings
99 Miles of Hauling
234,000 Gallons Diesel Fuel
Landscape Spreading Energy Savings
180 BTU/LB 16 BTU/LB due to Increased % Solids
14,000 mmBTU 500 mmBTU
Case Study:
Project Drivers o Address Failing
Infrastructure o Address Inefficient
What makes a successful project? o Maintain Class A
Biosolids o Eliminate Existing
o Enhanced Septage Receiving
What Are My Options?
Existing Process (Can We Make it More Efficient?)
o Change the Process
Dryer Design Criteria o Utilize Excess Digester
Gas at Dryer o “Future Max Month”
Solids Loading conditions within approximately 40 hours of operation per week
o Disposal to farmers with potential winter storage under existing canopy structure
Sludge Dryer Cost $3.0M (installed) Dryer Fuel & Power Cost -$14,250
Project Savings -$0.3M
exploring the seen
Improvements Implementation Results
Energy, Operational, & Maintenance Costs • Increase Revenue • Integrate Energy Efficiency
into Capital Improvement Programs • Additionally - Meet More
Stringent Regulations
Onondaga County WWTP • A comprehensive ICE evaluation
was performed on the six WWTPs making up the County System
• Over $24.5 million of integrated energy and capital improvements
• Over 6.3 million KWHrs of electrical savings and $2.1M of savings annually
• $2.3 million in energy incentives
• 11.6 year payback
City of North Tonawanda Wastewater Treatment Plant Biosolids Dryer Analysis
Endicott Wastewater Treatment Plant Upgrades Engineering Design & Construction Services
Onondaga County Energy Study & Energy Performance Contract
Town of Amherst Biosolids Dryer Analysis
Village of Gowanda Biosolids Dryer Evaluation
Erie County Water Authority Biosolids Dryer Evaluation
Private Industrial Client Dryer Procurement & Design
Drinking Water Sludge
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