Anaerobic Digestion: An Energy Producing Organics Processing Technology

Transcription

1 Anaerobic Digestion: An Energy Producing Organics Processing Technology Maryland Recycling Network/SWANA Mid-Atlantic Conference June 2015 Nora Goldstein, Editor BioCycle 1

2 What Is Anaerobic Digestion? Source: American Biogas Council 2

3 Anaerobic Digestion Systems Wet Systems Low Solids High Solids Dry Systems Easiest way to distinguish? Pumpable = Wet Move with a loader = Dry 3

4 Categories of SSO AD Projects in U.S. Wet and dry digesters processing source separated organics, primarily food waste streams Some solely commercial Some public/private partnerships Farm digesters receiving deliveries of off-farm substrates, including commercial SSO Captive Codigestion at municipal wastewater treatment plants 4

5 Commercial Anaerobic Digestion Plants In U.S. Source separated organics only, e.g., food waste, yard trimmings, FOG California: 6 operating and several in construction Wisconsin: 1 Mix of municipal biosolids and food waste streams Florida: 1 Ohio: about 6-8 New York State: 2 Plants in construction: California, Connecticut, Georgia, Massachusetts, New York, North Carolina and Vermont 5

6 Codigestion At Wastewater Treatment Plants Food processing waste, FOG, other high strength organics Taking source separated food waste that is slurried Add directly to digesters at WWTP Water Environment Research Foundation funding significant amount of research on this practice 6

7 Digester PRODUCTS Market Potential* $2.9 Billion *agricultural sector only Source: Innovation Center for US Dairy 7

8 Source: David Parry, CDM Smith, BioCycle, August

9 Energy Net Positive, Gresham, Oregon WWTP 9

10 Food Waste Preprocessing Options Elizabethtown College & Brubaker Farms Pulp food waste from 2,400 meals/day Pressed to 80% solids Capture grey water that is pumped to tank on same truck with 32-gallon totes 10

11 Michigan State University plug flow digester Pulped pre and postconsumer collected in compactor Preconsumer food prep and line waste in totes. Photos courtesy of Michigan State University 11

12 Kroger Recovery System, Compton, California 150 tons/day food waste 350+ stores in southern CA Digested solids go off-site for composting 12

13 Sensenig Farm, Kirkwood, Pennsylvania 13

14 A1 Organics, Eaton, Colorado 14

15 City of Gresham, Oregon WWTP 15

16 CleanWorld, Sacramento, CA 16

17 Ohio State University: Blackwell Hotel 17

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19 Central Contra Costa Solid Waste Authority (CA) commercial organics collection Collected SSO Ground material: 50-60% wet wt. Transported to East Bay Munc. Util. District, Oakland, CA 19

20 Quasar Zanesville (Ohio) 20

21 City of Toronto Disco Road Anaerobic Digestion Facility 83,000 tons/year residential SSO 21

22 Harvest Power Energy Garden in Reedy Creek, Orlando, Florida Technology: Continuous stirred tank reactor Feedstocks: ICI food waste, FOG, biosolids Design Capacity: 130,000 tons/year Energy: 5 MW End product: 6,000 tons/year of granulated fertilizer Colocated at WWTP Source: Harvest Power 22

23 Food waste preprocessing Turbo Separator: Depackaging Granulated fertilizer Source: Harvest Power 23

24 City of Augsburg, Germany 61,000 tons/year High solids digester + composting 24

25 Zero Waste Energy Development, San Jose, California Three-phased project: 90,000 tons/phase Phase 1: Commercial organics collected in San Jose wet/dry program 15 year contract with City of San Jose Technology: Zero Waste Energy/KompoFerm Electricity generation; eventually renewable CNG 25

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30 Monterey Regional Regional Waste Mngt. District Marina, CA Designed to process 5,000 tons/year 70% food, 30% green waste 4 containers tons each Thermophilic phase to AD Blended with woody materials and composted SmartFerm technology 30

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33 University of Wisconsin, Oshkosh Food Waste, Yard Trimmings, Bedding Capacity of 8,000 tpy Taking tons/week 28-day retention in digester Composting of digestate Totally enclosed, with biofilter for air treatment Biogas combusted in CHP unit Generated 8% of UWO overall energy consumption BIOFerm dry fermentation Source: Koenig; UW Oshkosh 33

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35 Food Waste, Yard Trimmings Food waste from campus, and grocery stores, restaurants in region 48% Recycled Digestate 31% Farm bedding 15% Food waste 6% Yard trimmings, woody material Source: Koenig; UW Oshkosh 35

36 Farm Bedding, Recycled Digestate Source: Koenig; UW Oshkosh 36

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38 Join Us! October 19-22, 2015 Boston, Massachusetts Thank You! 38