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