Tajiguas Resource Recovery Project
2018 CAPCOA
Engineering Symposium
Kevin Brown
Air Quality Engineer III
Santa Barbara County
Air Pollution Control District
October 30, 2018
1
Presentation Overview
• Background
• Process Description
• Emission Controls
• Permit Highlights
• Project Challenges
• Summary
2
3
Landfill Background
4
• On the coast
• Reaching
capacity in the
near future
• Replacement
landfill not
finalized
Regulatory Background
5
Process Description
6
Process Streams
7
8
Materials Recovery Facility (MRF)
• Tipping Area
– Accepts 290,000 TPY
combined waste
• Materials Sorting Area
– Recyclables
– Organics
– Residual waste
• Paper Dryer
9
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
Anaerobic Digestion Facility (ADF)
11
• 16 heated, enclosed digesters
• Dimensions: 100’ L x 22’ W x 16’ H
• 710 ton capacity
• 28 day digestion cycle
• Video of Digester Operations
12
Combined Heat and Power Engines
13
• 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
Compost Management Unit
14
• Twenty-six 230’ L x 16’ W
x 12’ H windrows
• Cured six to eight weeks
• Sold as commodity
15
Emission Controls
16
Baghouses
• Used to control
PM emissions
from:
– MRF tipping area
– MRF sorting area
– Paper dryer
17
Ammonia Scrubbers
18
• MRF
– Two crossflow
scrubbers
– Reduce odor
• ADF
– Crossflow scrubber
– Reduce ammonia
Biofilters
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
Activated Carbon Filters
20
• Used to reduce H2S
concentration in
biogas prior to
combustion in the
digester gas fired
CHP engines
SCR/Oxidation Catalyst
• Combined SCR and
Oxidation Catalyst
• Urea Injection
• NOx and CO control
• Equipped on the four
combined heating and
power engines
21
Enclosed Flares
22
• Digester Gas Flare– John Zink ZTOF enclosed flare
– 15.805 MMBtu/hr heat input rating
– Downstream from Venturi scrubber to
reduce ammonia concentration
• Landfill Gas Flare– John Zink ZTOF enclosed flare
– 39.000 MMBtu/hr heat input rating
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
Permit Highlights
24
BACT/CEMS
• BACT triggered for NOx, VOC, SOx, PM, PM10 and PM2.5
• 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
Offset Exemption
• California Health & Safety Code §42314
– 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
Permitted Emission Limits
• Annual Potential to Emit for Project (TPY):
27
NOx VOC CO SOx PM PM10 PM2.5
10.81 10.68 23.03 1.79 6.77 6.66 6.66
Project Challenges
28
HRA Modeling
29
• Update model for District permit
• Toxic emission factors lacking
for digester gas
• Will require toxic emission
source testing at startup
Odors
• Other waste conversion
and composting projects
have caused significant
odor issues
• This project has been
designed with odor
controls/mitigations
30
California Coastal Boundary
• Original project within
coastal zone boundary
• Forced redesign of facility
and supplemental EIR
• Resulted in lawsuit and
2 year delay
31
Summary
32
Questions?
33