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
