GHG Impact of Organic Waste

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Information about GHG Impact of Organic Waste

Published on May 7, 2009

Author: EnergyForAmerica

Source: slideshare.net

Description

Palo Alto generates yard waste, food and compostable waste, and biosolids. The City is concerned with managing these waste streams in order to minimize GHG emissions and return organics to the biosphere.

And Greenhouse Gases CO 2 CH 4 N 2 O Organic Waste Management

 

Compost Pile 1 ton Carbon => 3.6 Tons CO 2 Carbon-rich organics Soil-enriching compost

Incineration CO 2 H 2 O CO C N 2 O

Anaerobic Decomposition Carbon/Water to CO 2 Carbon/Water to CH 4 Sequestered Carbon

Palo Alto Composting & CO 2 21,000 tons/yr (60% water) 8,400 tons dry, 50% Carbon Methane production is negligible 15,120 tons of CO 2 Biogenic CO 2 , not counted in “footprint” Transportation Concerns: 1,100 tons additional if trucked to Sunnyvale then Gilroy Anthropogenic, counted in “footprint” Traffic impact; Roadway maintenance

21,000 tons/yr (60% water)

8,400 tons dry, 50% Carbon

Methane production is negligible

15,120 tons of CO 2

Biogenic CO 2 , not counted in “footprint”

Transportation Concerns:

1,100 tons additional if trucked to Sunnyvale then Gilroy

Anthropogenic, counted in “footprint”

Traffic impact; Roadway maintenance

Carbon Credit prices vary, but center around $20 / metric ton Added to costs of trucks, fuel, drivers, & acceptance fees. What’s 1,100 Tons Worth? $22,000 / year

Carbon Credit prices vary, but center around $20 / metric ton

Added to costs of trucks, fuel, drivers, & acceptance fees.

1,100 tons = + 0.15%

Landfilled Compostables tons tons tons Compostables are 29% of Palo Alto’s “black bin” waste. 22,737 Tons of

Modern Landfill Design

Palo Alto Food and Green Waste in Landfill 15,934 tons wet (60% water) 2,692 tons of Carbon (40% of dry is carbon) 1,346 tons Carbon released in 1st year 50% into CO 2 : 2,424 tons CO 2 50% into CH 4 : 50,880 tons CO 2 Equivalent 1,346 tons Carbon remaining

15,934 tons wet (60% water)

2,692 tons of Carbon (40% of dry is carbon)

1,346 tons Carbon released in 1st year

50% into CO 2 : 2,424 tons CO 2

50% into CH 4 : 50,880 tons CO 2 Equivalent

1,346 tons Carbon remaining

Palo Alto Landfilled Compostables, after Cap 1,346 tons Carbon from food/green waste carryforward 2,457 tons Carbon from other compostables (based on 45% carbon in dry weight) Total: 3,803 tons carbon 70% decomposes (2662 tons carbon) 85% captured and combusted to CO 2 8,146 tons of CO 2 15% escapes capture 719 tons CO 2 15,099 tons CO 2 Equivalent (methane)

1,346 tons Carbon from food/green waste carryforward

2,457 tons Carbon from other compostables (based on 45% carbon in dry weight)

Total: 3,803 tons carbon

70% decomposes (2662 tons carbon)

85% captured and combusted to CO 2

8,146 tons of CO 2

15% escapes capture

719 tons CO 2

15,099 tons CO 2 Equivalent (methane)

Total GHG Emissions from Landfilled Compostables For one year’s waste: 79,262 tons CO 2 Equivalent ! If diverted and composted: 18,534 tons CO 2 Full diversion would reduce PA Carbon Footprint by 60,728 tons of CO 2 e! 2.7 tons CO 2 e per ton food/yard waste (carbon credit value $54)

For one year’s waste:

79,262 tons CO 2 Equivalent !

If diverted and composted:

18,534 tons CO 2

Full diversion would reduce PA Carbon Footprint by 60,728 tons of CO 2 e!

2.7 tons CO 2 e per ton food/yard waste

(carbon credit value $54)

Single Family vs MF/C Greenwaste Palo Alto Target: 9000 tons (comm/mf) $70/ton +/- 13,700 tons still going to landfill 37,000 tons CO 2 e

Greenwaste Palo Alto Target:

9000 tons

(comm/mf)

$70/ton +/-

13,700 tons still going to landfill

37,000 tons CO 2 e

Organics GHG Reduction Part of the Zero Waste Plan Execution of plan is what matters What we do matters more than where Attention, Measurement, Reporting, Evaluation, & Improvement

Part of the Zero Waste Plan

Execution of plan is what matters

What we do matters more than where

Attention, Measurement, Reporting, Evaluation, & Improvement

Organics GHG Reduction #1 Move Aggressively on MF/Commercial Food Waste Collection! (& 3500 tons of leaves & grass) (‘000s tons CO 2 e reduction)

#1

Move Aggressively on MF/Commercial Food Waste Collection!

(& 3500 tons of leaves & grass)

(‘000s tons CO 2 e reduction)

Organics GHG Reduction #2 Implement Residential Food Waste Collection! (‘000s tons CO 2 e reduction)

#2

Implement Residential Food Waste Collection!

(‘000s tons CO 2 e reduction)

Organics GHG Reduction #3 Transform to BioChar/Bioenergy! All green bin contents = minus 7,000 tons CO 2 e 50% blackbin compostables = - 4500 tons CO 2 e Wastewater sludge = - 6,000 tons CO 2 e C CO 2 CO 2

#3

Transform to BioChar/Bioenergy!

All green bin contents = minus 7,000 tons CO 2 e

50% blackbin compostables = - 4500 tons CO 2 e

Wastewater sludge = - 6,000 tons CO 2 e

Organics Management Passive Criteria: lowest cost disposal diversion mandates Active Criteria: Resource recovery GHG minimization Long-term cost ?

Passive

Criteria:

lowest cost disposal

diversion mandates

Active

Criteria:

Resource recovery

GHG minimization

Long-term cost

Organics Management Passive Active Palo Alto Operation Multi-city Partnership Contracted Location & Technology

Organics Management Control Economies of Scale City-Owned Multi-City Contracted

Multi-tech Organics Approach Composting Digestion Soils Restoration Sequestration Green Energy Green Bins Wastewater Black Bins Pyrolysis

Location Possibilities Expansion of WWTF Industrial sites in Palo Alto Industrial sites elsewhere Energy/GHG Efficiency tradeoff: Large scale operations vs Local operations

Expansion of WWTF

Industrial sites in Palo Alto

Industrial sites elsewhere

Energy/GHG Efficiency tradeoff:

Large scale operations vs

Local operations

GHGs in Perspective Compost just a small piece of the opportunity What more important than where . Audit, execute, and improve. Regional partnership (we are not alone)

Compost just a small piece of the opportunity

What more important than where .

Audit, execute, and improve.

Regional partnership (we are not alone)

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