Tajiguas Resource Recovery Project

Transcription

1 Tajiguas Resource Recovery Project 2018 CAPCOA Engineering Symposium Kevin Brown Air Quality Engineer III Santa Barbara County Air Pollution Control District October 30,

2 Presentation Overview Background Process Description Emission Controls Permit Highlights Project Challenges Summary 2

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4 Landfill Background On the coast Reaching capacity in the near future Replacement landfill not finalized 4

5 Regulatory Background 5

6 Process Description 6

7 Process Streams 7

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9 Materials Recovery Facility (MRF) Tipping Area Accepts 290,000 TPY combined waste Materials Sorting Area Recyclables Organics Residual waste Paper Dryer 9

10 What is the Anaerobic Digestion Process? Decomposition of waste in an oxygen-free environmental Naturally occurs in the landfill Process is sped up using percolate and creating an ideal environment Byproduct is digester gas 10

11 Anaerobic Digestion Facility (ADF) 16 heated, enclosed digesters Dimensions: 100 L x 22 W x 16 H 710 ton capacity 28 day digestion cycle Video of Digester Operations 11

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13 Combined Heat and Power Engines Digester Gas CHP Engines: Two GE/Jenbacher JMS 416 B82 engines 1,573 bhp/1,141 kwe each Landfill Gas CHP Engines: Two GE/Jenbacher JMG 420 B82 engines 1,966 bhp/1,429 kwe each Electricity used for onsite needs or sold to the grid Heat used for digesters or paper recycling 13

14 Compost Management Unit Twenty-six 230 L x 16 W x 12 H windrows Cured six to eight weeks Sold as commodity 14

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16 Emission Controls 16

17 Baghouses Used to control PM emissions from: MRF tipping area MRF sorting area Paper dryer 17

18 MRF Two crossflow scrubbers Reduce odor ADF Crossflow scrubber Reduce ammonia Ammonia Scrubbers 18

19 Used to control VOC, PM, ammonia and odors from: MRF tipping area MRF sorting area ADF Size: 80 L x 80 W x 8 H Capacity: 50,000 cubic feet Biofilters 19

20 Activated Carbon Filters Used to reduce H 2 S concentration in biogas prior to combustion in the digester gas fired CHP engines 20

21 Combined SCR and Oxidation Catalyst Urea Injection NOx and CO control Equipped on the four combined heating and power engines SCR/Oxidation Catalyst 21

22 Digester Gas Flare John Zink ZTOF enclosed flare MMBtu/hr heat input rating Enclosed Flares Downstream from Venturi scrubber to reduce ammonia concentration Landfill Gas Flare John Zink ZTOF enclosed flare MMBtu/hr heat input rating 22

23 Compost Best Management Practices 20% dry woodchip blending Turning every 2 weeks 20 minute irrigation after turning 50% to 60% moisture content Video of Windrow Turner Emission Factor Assumption for Digestate Compost 23

24 Permit Highlights 24

25 BACT/CEMS BACT triggered for NO x, VOC, SO x, PM, PM 10 and PM 2.5 Equipment subject to BACT: ADF, baghouses, CHP engines, enclosed flares, composting operations, and emergency electrical generators Continuous Emissions Monitoring System (CEMS) and Data Acquisition System (DAS) for CHP engines 25

26 Offset Exemption California Health & Safety Code Produces 50 megawatts or less of electricity Applies BACT Emissions reductions from shutdown of existing equipment to be provided as emissions offsets Provide reasonable available offsets from facilities it owns or operates Made a good faith effort to secured reasonably available offsets 26

27 Permitted Emission Limits Annual Potential to Emit for Project (TPY): NOx VOC CO SOx PM PM10 PM

28 Project Challenges 28

29 HRA Modeling Update model for District permit Toxic emission factors lacking for digester gas Will require toxic emission source testing at startup 29

30 Odors Other waste conversion and composting projects have caused significant odor issues This project has been designed with odor controls/mitigations 30

31 California Coastal Boundary Original project within coastal zone boundary Forced redesign of facility and supplemental EIR Resulted in lawsuit and 2 year delay 31

32 Summary 32

33 Questions? 33