Biosolids Planning – Core Team Meeting

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Presentation transcript:

Biosolids Planning – Core Team Meeting City of Bellingham March 6, 2017

Safety Minute Grilling Safety: Get ready for spring grilling with these safety reminders

Statistics Subtitle is Arial 7,000 Americans are injured in outdoor grilling accidents each year 71% of all grill fires are residential (others include campsites, businesses, etc.) The majority of grilling accidents involve alcohol Subtitle is Arial Use alcohol in moderation. Don’t grill under the influence.

Do’s and Don’ts DON’T: DO: Keep your grill at least 10 feet away from standing structures Houses, carports, garages, porches Clean your grill often Built up fat and grease can provide fuel for a fire Keep decorations away from your grill Streamers, umbrellas, hanging baskets Keep a Fire Extinguisher nearby And know how to use it DON’T: Turn on the gas when the grill lid is closed Gas can build up and cause a explosion/fire ball when lit Leave the grill unattended Prep and plan before you start grilling Try to cook too many things at once Fatty foods can cause flare ups Use your grill indoors Fire and carbon monoxide hazard My father in-law melted the siding on his house because he keeps his grill next to the house. Clean your grill every time you use it. The clean setting on your grill does not clean it. Use a wire brush while the grill is still warm after cooking

Agenda Topic Description Leader Health and Safety Minute Grillin Giesbrecht Introduction (5 mins) Review agenda and meeting objectives   Confirm Selection Criteria (15 mins) Confirm updates to pass/fail and communicate changes to TBL criteria Matson Overview of World of Alternatives (30 min) Overview of select technologies and end uses  McKelvey Apply Pass/Fail Criteria (60 min) Apply pass/fail criteria to world of alternatives Krugel Develop Conceptual Alternatives Develop conceptual alternative packages from elements making it through pass/fail (to be analyzed with TBL+) Giesbrecht/ Next steps (10 mins) Messaging to Council at March 27 briefing Action Items Brown and Caldwell

Brown and Caldwell

Confirm Selection Criteria Confirm updates to pass/fail Communicate changes to TBL Brown and Caldwell

Confirm Selection Criteria Brown and Caldwell

Overview of World of Alternatives Solids Stabilization Beneficial End Use Biogas End Use Brown and Caldwell

Solids Stabilization Technologies Brown and Caldwell

Anaerobic Digestion Biological decomposition of solids under anaerobic conditions Mesophilic and thermophilic temperatures (95-135 degF) Reduces volatile solids and pathogens suitable for land application Produces methane-rich biogas Brown and Caldwell

Thermal Hydrolysis (THP) + Anaerobic Digestion Pre-processing before anaerobic digestion, breaks down cell walls to improve decomposition Improves pathogen reduction – produces Class A biosolids Requires both pre-THP dewatering and post-digestion dewatering Requires high-temperature steam (90 psi, 320oF) Brown and Caldwell

Aerobic Digestion Open to atmosphere, requires energy intensive aeration Reduces volatile solids and pathogens No biogas production Brown and Caldwell

Lagoons Very large land intensive ponds slow decomposition of organic matter Require dredging to remove settled solids 4-8 feet deep, aerobic and anaerobic zones Very low energy consumption Odorous and no biogas/energy recovery Large GHG emission Brown and Caldwell

Alkaline Stabilization Addition of alkaline chemical (e.g., lime) to raise pH above 12 Achieves stabilization faster than anaerobic digestion No reduction in solids (actually increases solids) No recovery of biogas/energy Very odorous Lime-stabilized biosolids (left) compared to anaerobically digester solids (right) Brown and Caldwell

Raw Solids Composting Decomposition of organic material, can achieve pathogen reduction Process requires mixing and/or aeration Requires additional organic material to be added to solids No reduction in solids (actually increases solids) and no recovery of biogas/energy Very odorous Brown and Caldwell

Incineration Destruction of solids to produce ash Can be autogenous with very little fuel input Can recover energy from exhaust to generate power Brown and Caldwell

Gasification Low-oxygen combustion of solids (sub-stochiometric) 1500-1800 degF Requires dried biosolids and supplemental feedstock (e.g. wood chips, tires) for reliable operation Produces char and low-Btu syngas (requires treatment before combusting) that is used to dry the solids Brown and Caldwell

Pyrolysis Anaerobic (starved-air) combustion of solids 750-1,100 deg F Requires dried biosolids as feedstock Produces char and bio-oil that requires refining before use as a vehicle fuel Brown and Caldwell

Hydrothermal Liquefaction High temperature (700oF), high pressure (3,000 psi) process Uses dewatered raw solids as feedstock Produces bio-oil that needs further refining before using as a vehicle fuel Brown and Caldwell

Supercritical Water Oxidation High temperature (1,100 degF), high pressure (3,600 psi) process Uses water in the feed as a solvent Above water’s critical point organics become soluble and inorganics become insoluble Can recover heat from the oxidation process to produce steam Brown and Caldwell

Primary Biosolids End Use Alternatives Brown and Caldwell

Land Application Can be applied to farmland, forests, and/or mine reclamation Class A or Class B biosolids Supports plant growth, recovery of soil tilth, and carbon sequestration Brown and Caldwell

Soil Amendment Addition of sand and sawdust (or other organic bulking agent) to create a topsoil amendment (similar to TAGRO); requires Class A digestion Composting of digested solids with other organic material (similar to GroCo); can produce Class A during composting Must be Class A biosolids product if sold to the public Used for gardening, etc. Brown and Caldwell

Dried Product Dried to a Class A product Can be used as a fertilizer sold in bags or in bulk (e.g., SoundGro) Can be used as a fuel to offset non-renewable fuel use (e.g., coal at a cement kiln) Brown and Caldwell

Landfill Can be used as backup disposal method Some agencies apply as an alternative daily cover or to reclaim a closed landfill Landfills typically will not accept unstabilized or liquid sludges Brown and Caldwell

Liquid Fertilizer Chemical hydrolysis improves breakdown of organic material Dewatered solids feed; can be used before or after digestion Final product is a Class A liquid product at 15-20% solids Requires steam and alkaline chemical as part of process Brown and Caldwell

Primary Biogas End Use Options Brown and Caldwell

Heating Heat is needed for anaerobic digestion process and excess heat can be used for winter building heat Most utilities use hot water boilers. Steam can be used too. Most sites do not require gas treatment Typically cannot use all of the biogas produced; off-site, year-round use required for full biogas utilization Brown and Caldwell

Combined Heat and Power (Cogeneration) Combusts biogas to produce power and recover heat Typically requires some level of gas treatment Examples: Reciprocating engines Turbines Microturbines Fuel cells Brown and Caldwell

Biogas Upgrading Separates methane in biogas from other constituents to produce biomethane Examples: Water solvent Pressure swing adsorption Membrane Can be injected into the natural gas utility to offset natural gas consumption Can be used in CNG vehicles as a vehicle fuel Brown and Caldwell

Flare Required as a backup to combust any waste gas No energy recovery Permitting typically requires enclosed waste gas burners (as compared to candlestick flares) Brown and Caldwell

Apply Pass/Fail Criteria Brown and Caldwell

Apply Pass/Fail Criteria Brown and Caldwell

Develop Conceptual Alternatives Brown and Caldwell

Conceptual Alternatives Brown and Caldwell

Conceptual Alternatives Brown and Caldwell

Next Steps Messaging to Council at March 27 briefing Action Items Brown and Caldwell