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Met council Environmental Services - overview of wastewater treatment
The document outlines various renewable energy production methods using wastewater, focusing on anaerobic digestion and steam turbine systems across several facilities. It details systems for flue gas treatment, such as wet scrubbing and denox systems, emphasizing their capacities and features. Additionally, it highlights technologies for energy recovery, emissions control, and potential future projects involving organic waste digestion.
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Met council Environmental Services - overview of wastewater treatment
- 1. MCES Wastewater DerivedEnergy Production Portfolio Metro •Steam Turbine •Non-Condensing Steam Turbine •Steam Campus Heat Blue Lake – Anaerobic Digestion/Drying •420 CFM Digester Gas to drying Empire – Anaerobic Digestion/Land Application •140 CFM Digester Gas to Boilers
- 2. Solids Loading byFacility Metro; 238 Empire ; 17 Blue Lake; 39.7 – 29.4 dtpd digested Seneca; 27.2 Solids Production in dtpd Metro Empire Blue Lake Seneca
- 3. Wastewater Derived Energy Production Empire – •140cfm digester gas •XX BTU Boilers •Flare Blue Lake •Organic Waste Direct to Digestion – Under Design •Excess gas to boilers •CNG under consideration Metro •Increasing Turbine Generator Output and Capacity •Recovering waste heat Seneca •Building Heat
- 4. Future Energy Production Empire – •CHPUnder Design – 1.0 MW •Organic Waste Direct to Digestion – Under Design – 28 cfm digester gas •CNG ready Blue Lake •Organic Waste Direct to Digestion – Under Design •Excess gas to boilers •CNG under consideration Metro •Increasing Turbine Generator Output and Capacity •Recovering waste heat Seneca •Recovering energy from solids
- 5. Metro Ash Initiative •Ash has high P content • Ash has low metals content • Ash has shown similar performance when compared to struvite, commercial fertilizer, and digested biosolids Ash to Fertilizer
- 8. Fluidized Bed Reactor– HZI FBR Capacity Types of Waste • Sewage Sludge (biosolids), Industrial sludges • 50 – 80% moisture Range of Capacity • Throughput: 10 – 120 dtpd (biosolids) • Thermal Capacity: 5 – 175 MMBtu/h (1.5 - 50 MW) • Reactor Sizes: 4 – 30 feet (1 – 10 m) diameter Features • Combustion Temperature: 1560 ºF (850 ºC) • No heat absorption in reactor (good for combustion of very wet fuels) Page 8MCES Scrubber Presentation May 12, 2014
- 9. 9 Wet Scrubbing -Multistage Flue Gas Scrubber Main Features For flue gas from all types of energy-from-waste facilities Multifunctional: quenching, gas absorption, dust separation, dioxin removal, condensation Neutralization agent: sodium hydroxide (or hydrated lime) Adsorbent injection (for additional dioxin removal) GasPoint: very low emissions achievable Open for extensions (e.g. heat recovery by condensation) Capacity Flue gas volume up to 150,000 scfm (250,000N m3/h) MCES Scrubber Presentation May 12, 2014
- 10. 10 Semi Dry System Types HitachiZosen Inova Semi Dry System Main Features System based on fluidized bed reactor Reliable operation through minimization of moving parts High recirculation rate, therefore high buffering capacity and low sorbent consumption Possible modification to other additives Safely fulfils EU stack emission guidelines (17.BlmSchV and lower) Capacity Flue gas volume up to 150,000 scfm (250,000N m3/h) MCES Scrubber Presentation May 12, 2014
- 11. 11 DeNOx Systems Main Features SNCR Injectionof ammonia water or urea solution into post combustion chamber With or without ammonia recovery Reaches NOx removal up to 80% SCR Catalysts for NOx-removal and dioxin reduction Arrangement on hot (235°-260°C) or cool (180°- 220°C) side of flue gas scrubbing Reaches NOx removal up to 90% Capacity Flue gas volume up to 150,000 scfm (250,000N m3/h) MCES Scrubber Presentation May 12, 2014
- 12. Metropolitan Council Environmental Services| St. Paul, MN Page12 Three independent lines supplying one steam turbine generating 4 MWe No auxiliary fuel required during normal operation Combined heat and power production Emissions surpass MACT requirements for SSI Hitachi Zosen Inova, EPC contractor for incinerator/boiler, flue gas treatment, and generator Client Metropolitan Council Environmental Services, St. Paul, MN Start-up 2004 Technology Furnace 3 Incinerator Lines Energy recovery Recuperators, Boilers Flue gas treatment SNCR, carbon injection, fabric filter, wet-ESP, wet scrubber heat exchangers Technical Data Fuel Municipal sewage sludge Waste capacity 315 dry t/d @ 30% solids Net calorific value 2,000 Btu/lb wet Reactor Diameter 22 feet Steam rate 3 x 25,000 pph (450 psi, 750 °F ) Key Data MCES Scrubber Presentation May 12, 2014
- 13. MCES: Plant Contextof Wet Scrubber System Page 13 •WET ESP •FLUID BED •RECUPERATOR •WASTE HEAT • BLR •CARBON •INJECTION •BAGHOUSE •RING JET •SCRUBBER STACK REHEAT HEX FLUIDIZED BED REACTOR FLUIDIZING AIR HEAT EXCHANGER BOILER STACK REHEAT HX CARBON INJECTION BAGHOUSE WET SCRUBBER RING JET WET ESP HEAT RECOVERY COMBUSTION Hg PCDD-F PM Acid Gases PM PM MCES Scrubber Presentation May 12, 2014