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Fats, Oils & Grease (FOG) Abatement Program Update June 28, 2010. WSSC FOG PROGRAM HISTORY. 1990’s - 2005 WSSC had an active FOG Program with various procedures 2005 Consent Decree, Article 3 – FOG Program Milestones June 2006
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Fats, Oils & Grease (FOG) Abatement Program Update • June 28, 2010
WSSC FOG PROGRAM HISTORY • 1990’s - 2005 • WSSC had an active FOG Program with various procedures • 2005 Consent Decree, Article 3 – FOG Program Milestones • June 2006 • Established and submitted database of all FSEs in the sanitary District • Prepared and submitted a Modified FOG Program Plan for EPA approval • September 2006 • Prepared and submitted Draft FSE Wastewater Discharge Permit • May 2007 • Received EPA approvals and began formal permitting and initial inspections of FSEs • Update database with new or out of business FSEs • 2007 – 2009 • Proposed and adopted WSSC Code changes to better define formal FOG Program basics • Completed 100 inspections per month, majority of systems in non-compliance with permit/Code • Scheduling and witnessing pump-downs at flow-based units
WSSC FOG Abatement Program • Enhancements to FOG Abatement Program as part of SSO Consent Decree • Plumbing & Fuel Gas (P&FG) Code • Waste Haulers are required to obtain Permits • Applicable Food Service Establishments (FSEs) are required to obtain Discharge Permit • Applicable FSEs are required to install Grease Abatement Systems • Increased cleaning and inspection requirements
Waste Hauler Discharge Permits • Types of Permits • Waste Hauler Discharge Permit • Discharge Permit required for each truck discharging at disposal sites designated by the Commission • Zero Discharge Permit • Required for trucks cleaning grease interceptors within WSSC service area, but disposing outside Commission’s service area • Fees • WSSC Permit Fee • Annual fee based on vehicle capacity • Allows unlimited dumping during permitted hours • County Health Department Permit Fee
FSE Discharge Permits • Section 818 of WSSC P&FG Code • Applies to all establishments (FSEs) where food is served to the public with or without charge including, but not limited to: • Restaurants • Cafeterias • Hotel kitchens • Church kitchens • Hospital cafeterias • Bars • All FSEs must apply for Permit • FSE Discharge Permit Contains: • Best Management Practices for controlling FOG • On-site Recordkeeping Requirements • Grease Abatement System Installation and O&M Standards, if applicable • Other general conditions or procedures
FSE Grease Abatement Systems • Installation Requirements • Section 302 of WSSC P&FG Code provides: • Design, location, sizing, and piping installation requirements for • Flow-Based Grease Interceptors • Volume-Based Grease Interceptors • Maintenance Requirements • Section 818 of WSSC P&FG Code requires: • Maintenance of efficient operations by owner/operator at their expense • 25% Rule • Owner/operator shall ensure accumulation of FOG/solids does not exceed 25% of liquid retention capacity • Maintenance Interval • Volume Based Grease Interceptors – Monthly, Quarterly or by the “25% Rule” • Flow Based Grease Interceptors – Manufacturer’s recommendations (weekly or bi-weekly) or by the “25% Rule”
WSSC FOG Handling • Impacts of FOG Abatement Program Enhancements • Increased discharge volume to grease receiving station • Muddy Branch Wastewater Pump Station • No pretreatment of waste stream • Discharges to Blue Plains AWWTP • Removed in screenings or primary clarifier scum, and landfilled • No sample collection or volume measurement features • July 1, 2010 – WSSC initiating Manifest System at Muddy Branch Site • Site cannot accommodate anticipated upgrades
Current FOG Handling Practices Muddy Branch Disposal Site
WSSC FOG Receiving &Treatment • Septage/FOG Study Schedule • March 29, 2007 • Study Kick-off • March 14, 2008 • Presentation of Recommendations Stakeholder Workshop • November 26, 2008 • Study Expanded to Include Evaluation of FOG Handling and Treatment Processes • November 2, 2009 • Study Expanded to Address Montgomery County Concerns • Completion of FOG Study – To be determined
WSSC FOG Receiving &Treatment • Evaluation of FOG Receiving/Treatment Approach • Grease Interceptor Waste Volume Estimates • Characterization of Grease Interceptor Waste • Grease Receiving/Treatment Process Alternatives • Grease Receiving/Treatment Site Alternatives
Grease interceptor waste volume estimates • Results of WSSC initial inspections of FSEs to date (June 2010) • Estimated # of FSEs requiring grease abatement • Total for Montgomery and Prince George’s Counties = 4,600 • Breakdown of Grease Interceptors • 20% (900 -950) have volume-based (outside) interceptors serviced by a contractor • 40% (1800-1900) have flow-based (inside) interceptors serviced by a contractor • 40% (1800-1900) have flow-based (inside) interceptors serviced by owner, have a non-working interceptor, or have no interceptor *Estimate from known FSEs in Montgomery and PG Counties. Does not include grease from outside jurisdictions.
Grease interceptor waste CHARACTERISTICS Sampling at Muddy Branch Disposal Site
GOALS FOR GREASE RECEIVING/TREATMENT FACILITY • Primary Goals • Prevent accumulation of grease in collection system and reduce SSOs • Optimize WSSC’s capital investment • Address operations and maintenance challenges • Provide safe, secure system for haulers that protects the environment • Provide system that considers impact on neighborhoods and citizens • Secondary Goals • Minimize operation costs • Provide a source of revenue • Focus on sustainability – greenhouse gas reduction, renewable energy, sustainable design • Provide local system that allows haulers to provide cost competitive services
GREASE RECEIVING/TREATMENT process alternatives • Benchmarking of FOG Facilities • City of Baltimore, MD – Direct Discharge/Anaerobic Digestion • Derry Township Municipal Authority, PA – Aerobic Digestion • Kline’s Services, Salunga, PA – Fuel Oil Production • EcoSolve, Charlotte, NC – Dewatering Technology • Valley Proteins, Baltimore, MD – Fuel Oil Production
GREASE RECEIVING/TREATMENT process alternatives • Pretreatment Process Alternatives • Screening • SV-2 System • Removes trash and debris using steam to heat grease flow • Standard Wastewater Influent Screen • Screen and washing compactor • Requires larger bar spacing and high temperature pressure washer • Grease Concentration • Fractionation Tank (with or without heat) • Batch separation process with multiple withdrawal ports for debris, aqueous layer and grease • Scum Concentrator • Continuous flow separation process with mechanical removal of grease from surface SV-2 Unit Screenings Fractionation Tank
GREASE RECEIVING/TREATMENT process alternatives • Primary Treatment/Disposal Alternatives • Municipal Solid Waste • Mix with screenings and dispose at landfill • Mixing with Dewatered Solids • Mix with sludge, lime stabilize and land apply • Incineration • Mix with sludge and incinerate at Western Branch WWTP • Land Treatment • Direct application of grease interceptor waste to farmland • Aerobic Digestion • Aerobic digestion of grease and dewatering
GREASE RECEIVING/TREATMENT process alternatives • Primary Treatment/Disposal Alternatives • Anaerobic Digestion • Anaerobic digestion and production of methane gas • Biodiesel Production • Conversion of grease interceptor waste to biodiesel with intermediate processing • Fuel Oil Production • Conversion of grease interceptor waste to fuel oil • Dewatering • Screw press cake product to be incinerated, land applied or landfilled
Selected alternative Separation Tank 90 to 100 oF • Fuel Oil Production – Burt Waste System Unload at 175 gpm, 10-15 min/truck Cook Tank 165 oF Facility Requirements • (2) SV-2 Separation Units • (2) Separation Tanks • (1) Cook Tank • Finished Oil Tank • Fuel Oil Tank • Boiler - Fuel Oil • Process Piping • Building • Odor Control System • Video Monitoring System • Fence/Gate Access System • Auto Sampler
Selected alternatives • Financial Considerations • Planning Level Construction Cost Estimate for Facility • $2,200,000 to $2,800,000 per site • Planning Level O&M Cost Estimate for Facility • $300,000 annually (includes staff, power, equipment maintenance/replacement, etc.) • Value of Product • Potentially 5,250,000 – 5,550,000* gallons of grease interceptor waste generated from known FSEs annually • 111,000 gallons of product annually (20 gallons of product per 1,000 gallons of interceptor waste) • Process Requirements (16 to 20 gallons of product per hour) = 37,500 gallons annually • Residual of 73,500 gallons annually = 607,000 lbs annually • At $0.15/lb, revenue = $91,000 • Reduction in collection system maintenance costs by keeping FOG out of system *Estimate from known FSEs in Montgomery and PG Counties. Does not include grease from outside jurisdictions.
GREASE RECEIVING/TREATMENT site alternatives • Site Selection Evaluation Criteria • System Reliability • Hauler Impacts • Constructability • Ease of Operation • Public Acceptance • Community/Environmental Impacts • Construction Cost • Operations and Maintenance Cost
GREASE RECEIVING/TREATMENT site • Alternative Sites Considered Montgomery county prince george’s county 1 1 – Crystal Rock PS 2 – Clopper Road PS 3 – Seneca WWTP 4 – Seneca I&II PS 5 – Rock Creek WWTP 6 – Muddy Branch Disposal Site 1 – Parkway WWTP 2 – Tanglewood PS 3 – Anacostia I&II PS 4 – Ritchie Road PS 5 – Western Branch WWTP 6 – Piscataway WWTP 1 2 3 2 5 3 4 4 6 5 6 Food Service Establishment Current Waste Discharge Sites
Preliminary site recommendation Prince George’s County • Anacostia I&II PS • Advantages • Located in the commercial corridor of Prince George’s County • Space on site for construction of new facilities • Surrounded by wooded area and other industrial facilities
Preliminary site recommendation Montgomery County • Abandoned Rock Creek WWTP • Advantages • Centrally located to FSEs in Montgomery County • Existing facilities on-site could possibly be utilized (building, fencing) • Surrounded by wooded area and other industrial facilities • Access to site is convenient for haulers
Anaerobic digestion & combined heat & Power study • Scope • Evaluate feasibility of viable economic alternatives for adding anaerobic digestion and combined heat and power and/or biosolids gasification and drying facilities for the biosolids generated at the Seneca and Piscataway Wastewater Treatment Plants • Goal • Reduce fossil fuel derived energy use, biosolids volume and land application disposal costs • Impact • Fuel oil product could be utilized as a feedstock for anaerobic digestion • Schedule • Kick-off Meeting: July 2010 • Project Duration: 10 months
summary • Enhancements to FOG Abatement Program via Updates to the WSSC P&FG Code • Current FOG handling facility at Muddy Branch is inadequate and will be abandoned • P&FG updates could result in an estimated 5,250,000 – 5,550,000 gallons* of grease interceptor waste from Montgomery and Prince George’s Counties • Grease interceptor waste has high solids, BOD and COD content and is highly variable • SV-2 screening with Fuel Oil Production Process is the recommended approach for grease receiving/treatment • Preliminary Receiving/Processing Site Recommendations • Prince George’s County – Anacostia I&II Pump Station • Montgomery County – Rock Creek WWTP • Modify hauler tipping fee program *Estimate from known FSEs in Montgomery and PG Counties. Does not include grease from outside jurisdictions.
WSSC FOG PROGRAM SCHEDULE • December 2010 (Consent Decree Deadline) • All known “qualifying” FSEs must be permitted • Updated and detailed list of permitted FSEs • December 2011 (Internal WSSC Deadline) • Complete initial inspections of all known FSEs • Basis for the Consent Decree Report • May 2012 (Consent Decree Deadline) • Complete initial inspections of all known FSEs • Submit updated and detailed Report