Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
Review & Discussion of
Zanker Recycling Tour
On April 27 , 2017
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
RodK 9127
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Zanker Recycling Tour Review
Site 1
2017/05/04 EGG Morning Program
Mei-Ling Shek
1960’s Began as Class 3 landfill (No hazardous waste). 1972 landfill closed.
2600 tons of material per day
StephenH
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
Landscape & aggregate material 10-20% business (30% waste,70% virgin)
RodK 9132
Base rock (class 2, CalTran approved) is bread & butter. Base rock plus has crushed recycled concrete.
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
Demolition debris
RodK 9143
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
Wood waste is ground up; nails removed by magnets.
Clean wood
mulch. Not-so-clean wood
biodigester
Painted & pressure-treated wood
trash
RodK 9146
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
Demolition debris separation area
RodK 9159
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
RodK 9165
Manual removal of leaves, plastics on conveyor belt
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
RodK 9172
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
StephenH
Metal parts
other recyclers
80% recycling rate – certified by 3rd party
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
StephenH
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Zanker Recycling Tour Review
1.6 MW
2017/05/04 EGG Morning Program
Mei-Ling Shek
16 concrete AD digesters
http://zerowasteenergy.com/downloads/ ZWE-San Jose Flyer5.7 pdf
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
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Mei-Ling Shek
Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
StephenH
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
Inside
RodK 9188
500 tons organic waste per day
400,000 lbs bacteria 45 deg C 21 days to complete
Some yardwaste added for moisture. The rest
compost directly.
Digestate (residue)
compost at Zvest.
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
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Mei-Ling Shek
Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Mei-Ling Shek
RodK 9184
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Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
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Mei-Ling Shek
Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Site 2
Construction debris (from the inside of buildings)
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Mei-Ling Shek
Zanker Recycling Tour Review
Sheet rock
2017/05/04 EGG Morning Program
gypsum for farmers
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Mei-Ling Shek
Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
Insulation material is trash
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Mei-Ling Shek
Zanker Recycling Tour Review
2017/05/04 EGG Morning Program
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Mei-Ling Shek
Anaerobic Digestion
2017/05/04 EGG Morning Program
Mei-Ling Shek
Anaerobic Digestion
Basics
Mei-Ling Shek*
Presentation to EGG
May 4 , 2017
* dropped out of Biology after Form 3 (9th Grade) in Hong Kong
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Anaerobic Digestion
2017/05/04 EGG Morning Program
Mei-Ling Shek
Questions after the tour of Zanker Recycling on 4/27:
What is the process of anaerobic digestion,
producing methane?
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Anaerobic Digestion
2017/05/04 EGG Morning Program
Vague idea of anaerobic digestion here:
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Mei-Ling Shek
Anaerobic Digestion
2017/05/04 EGG Morning Program
Mei-Ling Shek
Things are of course far more complicated…
Various types of bacteria break down the organic
waste into simple molecules, which microorganisms
called methanogens (archaea) use in their
metabolism, emitting methane as by-product.
single-cell organism without a nucleus
(Prokaryote)
domains
archaea
bacteria
similar shapes and appearance;
but different chemistry in cell walls,
& genetic differences
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Anaerobic Digestion
2017/05/04 EGG Morning Program
Bacteria and methanogens work together
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Mei-Ling Shek
Anaerobic Digestion
2017/05/04 EGG Morning Program
Mei-Ling Shek
Anaerobic digestion process
volatile fatty acids (VFA)
hydrogen sulfide
pH-sensitive, 6.5 - 8
+H2O
Bacteria
Methanogen
http://www.ccibioenergy.com/centralized-solutions/what-is-ad
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Anaerobic Digestion
2017/05/04 EGG Morning Program
Mei-Ling Shek
Different methanogens -- different conditions
Volatile
fatty acids
(gm/liter)
Ammonium
(gm/liter)
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Anaerobic Digestion
2017/05/04 EGG Morning Program
Mei-Ling Shek
Methanogens in the stomach of a cow (ruminant)
convert 6% of ingested energy into methane
Global warming potential of methane 28-36 times carbon dioxide
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https://www.epa.gov/climate-indicators/greenhouse-gases
Anaerobic Digestion
2017/05/04 EGG Morning Program
Mei-Ling Shek
Global warming potential of methane 28-36 times carbon dioxide
https://www.epa.gov/climate-indicators/greenhouse-gases
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