Composting Adapted from presentation of Terra Luke, 2013.
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Transcript of Composting Adapted from presentation of Terra Luke, 2013.
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Composting
Adapted from presentation of Terra Luke, 2013
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Objectives
Composting introduction Backyard composting Community composting Commercial/Municipal composting Advantages & Disadvantages
www.scgh.com
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What is Compost? Decayed organic material
Used to condition soil & add nutrients Slow release weak fertilizer
howtocompost.org
Waysofthewildinstitute.com
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Composting Methods
Anaerobic Aerobic
Microbes Worms (Vermicomposting)
Yard Waste Food Waste Wastewater Sludge Municipal Solid Waste
Backyard Community Commercial/Municipal
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Anaerobic Organic Material Water
40% to 75% (solid) 80% to 99% (liquid)
Absence of Oxygen Naturally occurring
Microbes
Fermentation Byproduct: Compost, CH4, …
theveggielady.com
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Aerobic Organic Material Moisture Oxygen Naturally occurring
Microbes or Worms Bulking agent
Respiration Organics + O2 + Nutrients +
Microbes More Microbes + Stable Organics + Heat + CO2 + H2O + NH3 + SO4 +…
ww
w.u
aex.e
du
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Microbes
sabacooperative.org
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Vermicomposting
Source :mgsenvironment.blogspot.com
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Vermicomposting
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Yard Waste Leaves Grass Brush Flowering
Plants Garden
Waste
ww1.hdnux.com
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Food Waste
switchboard.nrdc.org
assets.inhabitat.com
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futureofschaumburg.files.wordpress.com
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Wastewater Sludge
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Municipal Solid Waste Composting Less common than Yard or Food Waste
composting Source separation or post-collection
processing to remove contaminants & break bags
Final product often contaminated More processing to create marketable product, or Use as landfill cover
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Design Considerations (Aerobic)Parameter Values Comments
Particle size Smaller more surface area Too small limits O2 transfer
Carbon-to-nitrogen ratio (C/N)
Low NH3
High Nitrogen limitation
Moisture content Too little slows microbesToo much leads to anaerobic conditions
Mixing / Turning If that is how oxygen is introduced
Temperature Beyond 151F, microbes are harmed
Pathogen control For extended time (or higher for less time)(Sewage sludge: > 131F 15 days & 5 turns)
Land requirement Per 50 ton/d
pH Is optimal, >8.5 & ammonia is produced
Bulking agent Needed for wet or fine materials to create void space
Stabilization Drop in temperature, self heating capacity, oxygen uptake, Chaetomium gracilis growth, or starch-iodine test
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Size
www.biocycle.net
Tub Grinder
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Carbon to Nitrogen 30:1
Carbon source Nitrogen source
cwmi.css.cornell.edu/compostingathome.pdf
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Green & Brown Balance
Online Calculator www.klickitatcounty.or
g/solidwaste/fileshtml/organics/compostCalc.htm
Source: Cornell Waste Management Institute. Composting at Home
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Example Ideal C:N is 30:1
25-30 is good 20-40 is decent
C:N = % carbon / % nitrogen
Fruit waste: 44.52 % C & 1.4% N
Loose dry leaves: 42.22 % C & 0.9 % N
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Example (Cont.) What can be added to loose leaves to bring
the material closer to 30:1? Newsprint C:N= 54:1?
Fruit Waste C:N= 32:1?
Vegetable Waste C:N= 11:1?
Source: http://www.klickitatcounty.org/solidwaste/fileshtml/organics/compostCalc.htm
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Temperature Pile size Turning Blowing
Air
casellaorganics.com
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WATER Microbes
Propagation Metabolizin
g Movement
Oxygen Transfer
When squeezed hard moisture should be visible but not run out of hand. @ 50 to 60 % moisture content, compost will hold form when squeezed & resist crumbling
www.depi.vic.gov.au
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Backyard composting
University of Minnesota extension service
www.mnn.comBest to “let grass lie”, but can be Nitrogen source
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Community Composting Apartments Neighborhoods Community Wide
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New York City – Starting a CCC Develop relationship with local NYC Compost Project
Eventually host compost workdays & tours Designate a compost contact
With NYC Compost Project Answer basic questions about site
Have actively managed compost system One or more persons addressing problems & finishing
compost
Guidance (www.nyc.gov/html/nycwasteless/html/...) Outdoor - compost/edu_outdoor.shtml Indoor - compost/edu_indoor.shtml
Low price bins
www.nyc.gov
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Source: http://www.phillycompost.com/Map.html
Philadelphia Shared community
sites: purple Contact Site Host to join
Private sites: red Check with site contact
before visiting Shared sites at capacity
go “private” Yellow sites are people
looking for a shared site Commercial sites: green City sites: blue
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Commercial/Municipal Composting Commercial
Businesses, communities
Municipal Yard Waste,
Landscapers
Source: montgomerycountymd.gov
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Wilmington Organic Recycling Center, DE 160,000 ton/yr of source separated organic
waste converted to useful compost Reduces greenhouse gas emissions equivalent
to 8,800 automobiles from area roads per year Diverts 120,000
ton/yr from landfill Lowers disposal
costs 20-50% compared to surrounding landfills
peninsula-compost.com
www.reuters.com
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Community Composting & Epiphergy Community Composting,
Rochester NY Weekly Pickup of
Fruit & vegetable scraps Meat, shellfish, fish products Pasta, bread, cereal Dairy products, egg shells Coffee grounds, filters & tea
bags Paper towels & rolls Muffin wrappers Paper plates Pet food Household plants
Epiphergy Upcycles organic
waste materials Produces biofuels,
animal feed, & compost feed w/ ~100%
digestibility Ethanol & Biodiesel
www.communitycomposting.org
mediad.publicbroadcasting.net
www.epiphergy.com
Graham A. Fennie - Founder & CEO Epiphergy
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Collection
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Tipping Area, Tub Shredder
www.menv.com
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www.enrich.ie
Windrows
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Technologies used
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www.enrich.ie
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codywitt.files.wordpress.com
Operation www.youtube.com/watch?v=8Q6Fl34mWGw&NR=1&feature
=endscreen
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Static Pile
www.howardcountymd.gov
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Static Pile
dirthuggercompost.files.wordpress.com
Dirt Hugger The Dalles Oregon
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In Vessel Better operational
control Better odor control Lower labor costs Smaller footprint Faster
Higher capital costs Higher operating &
maintenance costs
www.ohio.edu
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In Vessel - Rotating Rocket Composter. Rotation turns and moves
material. Cooked & Uncooked Fruit, Vegetables, Meat & Fish Cooked & Uncooked Garden Waste Animal Waste (including some types of bedding)
Specifications: Up to: Length 7.0m Width 1.4m Height 1.8m Capacity 3500 l/wk Motor 1.5kWh Heater 2 x 1kWh
Thermostatically controlled
Power 30kWh/wk
dumbartonroad.files.wordpress.com
www.tidyplanet.co.uk/our-products/the-rocket/
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Montclair University
Turning French Toast To CompostMay 5, 2009 by Jessica KitchinNew Jersey Monthly
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In Vessel - Stationary SV Composter™ (Engineered Compost
Systems) Static Pile
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Composting Time Windrow & Backyard
In Vessel
Curing can take up to 4 more weeks Compost stabilizes
w/further turning or air input
gwri.calpoly.edu
In-Vessel Bays(Mechanical Agitation)
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Trommel Screen
www.columbiapa.net
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Advantages Natural fertilizer Better soil Backyard/ on-site
composting Less waste going
to landfills ~25% More efficient
nutrient recycling Marketable
commodity
epa.gov
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Disadvantages Odors
Can control w/ static pile or in-vessel
Respiratory & health issues at commercial scale
Backyard Up front costs Effort