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CalRecycle 18th Annual Technical Training Series
December 4, 2018 - Monterey, CA
Kevin Barnes – City of Bakersfield
Who Are We? Bakersfield, the 9th Largest City
Nearly 100 Collection Routes
Largest Public Composter in CA
Countywide Organics Recycler
20 Years of Food Waste Experience
Over 20,000 Tons/Year of Food Waste
Leader in Low Emission, Automated Composting
New Things for 2018/19 Commercial organic programs ramping up
Woody biomass glut (solar displaced CA cogen plants)
Lower threshold for AB 1826 (4 cubic yards/week refuse)
Phase-out of ADC recycling credit in 2020
Future SB 1383 programs
Diversion program simplicity and economy
Physical contaminants (PC) limited by new Title 14 regs
Processing system advances
“Pure” Food Waste vs. Other OrganicsWhat’s in YOUR organics program?
Food and FiberThousands of Tons
Pure FoodHundreds of Tons
Food Left in PackagingLeftovers, Anyone?
Fiberand
PlasticPackaging
…And Along Comes the “Baggage”
Pure Food Waste vs. Other Organics“What’s in YOUR organics program?”
Notice-
No Plastic Bag
Barrel Liner
Boy, do I hatescraping andrinsing these
barrels.
Taking the Bad With the Good
Food Composting has a 2% reject rate, even
with plastic!
Notice-
Barrel Liner
For
Sanitation
I’m glad wedon’t have toscrape and
rinsethis stuff!
Taking the Bad With the Good
Curbside Recycling commonly has a 20%
reject rate.
Food Composting has a 2% reject rate, even
with plastic!
Compostable Plastic Bags?
“Bio” plastic bags cost about $0.75 each
Regular bags cost $0.10 each
About 25 bags per bin
Extra bag cost = $16.25 per bin served
About 500 pounds of feedstock per bin
Extra bag cost = $65 per ton
Collection Economics??Hint: Both trucks cost $300k each
Commercial OrganicsWith Paper Fiber
Commercial OrganicsWithout Paper Fiber
1/3 Cubic Yard per Stop
3 Cubic Yards per Stop
Windrow Management
Greenwaste WithoutCommercial Organics
Greenwaste WithCommercial Organics
Aerated Static Pile (ASP) With Compost Cover
Source: O2 Compost Systemso2compost.com
-No windrow turner needed-Bio-filter compost cap reduces VOCs by 98%-Process takes less than half the space-Material handling can be electrified to reduce diesel NOx-Process saves 2/3 of the water-Heat under cap repels vectors-Compost cap traps litter
Source: O2 Compost Systemso2compost.com
Multiple Benefits of ASPs
Screening Debris from Compost
Take a Closer Look at Screening
Source: O2 Compost Systemso2compost.com
Can the PCs be kept intact, large enough to screen out?
Yes - Adapt the ProcessTreat PCs more “gently” by not turning windrows
SJVAPCD Team Project - 2012
Conveyorized ASP System - 2017
GrinderPiler
New Passive Ridge ASP System - 2018
Blowers no
longer needed
to force feed
4” dia perf pipes
Air is drawn
into ends of
parallel 6” dia
perf pipes
New System vs. Old Windrows
Finished Product
Summary
Commercial Organic Diversion is DYNAMIC
Trade-offs for greater diversion Convenience and economy for users New regulations raised the bar Ongoing developments in state of the art Multiple environmental goals achieved
VOC reduction Diesel NOx reduction Space savings Water Savings More food recycling Improved PC management
