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Small-scale composting of
poultry feathers and offal
Alex Berland
Passmore Poultry Pluckers
Acknowledgment
This presentation was funded in part by
the Investment Agriculture Foundation of
B.C. through programs it delivers on behalf
of Agriculture and Agri-Food Canada and
the B.C. Ministry of Agriculture.
Copyright Passmore Poultry Pluckers Inc. 2October 2013
Small-scale composting of
poultry feathers and offal
• Siting
• Critical elements
• Methods
– Bin design
• Trouble shooting
• References
Copyright Passmore Poultry Pluckers Inc. 3October 2013
http://compost.css.cornell.edu/naturalrenderingFS.pdf
Distances in feet
Siting of operation
4
Three critical elements
1. Carbon
2. Moisture
3. Air
Copyright Passmore Poultry Pluckers Inc. 5October 2013
Carbon/Nitrogen Ratio
• The C:N ratio should be between 20:1 to 35:1 Optimal C:N is 25: to 30:1.
• According to some, the best form of carbon is untreated sawdust.
• With straw, longer composting times and possible run off of liquids.
• We use wood chipper waste, can also use paper.
• Material that has completed the compost cycle can be partially substituted (will also ‘seed’ bacteria)
Copyright Passmore Poultry Pluckers Inc. 6October 2013
Attributes of common on-farm
composting materials
http://bqa.wsu.edu/documents/ON%20FARM%20COMPOSTING.pdf 7
Water is a critical component
• The pile should be 45-60% moisture.
• No need to add water to litter with normal
moisture levels.
• The mixture should hold its shape without
dripping if you squeeze some in your hand.
Copyright Passmore Poultry Pluckers Inc. 8October 2013
Checking moisture content in compost
• Squeeze a small handful of your raw material.
• It should feel like a wrung-out sponge.
• If the material does not feel moist and
crumbles, it is too dry.
• If you can squeeze water from the material by
hand, it is too wet.
• If it sticks together slightly and leaves a few
drops of water on your hand, it’s just right.
Copyright Passmore Poultry Pluckers Inc. 9October 2013
Air
• Turning is not recommended until you’re pretty certain the carcass material is gone.
– For poultry offal it likely will disappear in 2 weeks, but
initially wait at least a month.
• When building the pile, try to layer the offal and co-composting materials repeatedly on top of 60cm (2’) of a more absorbent & porous bed of feed-stocks.
– This will help speed the process versus having one big
mass of offal.
Copyright Passmore Poultry Pluckers Inc. 10October 2013
Best way to check C:N and
moisture is to record temperature• Highest rates of decomposition at 43 - 66°C.
• Goal: constant heat over 55°C for three days.
• Avoid temperature above 66°C as microbial activity declines rapidly.
• For optimal temperature use a layer cap of inactive sawdust or straw to act as insulation.
• This also ensures that the pile will remain aerobic (hot air rises out of the top and draws in cold air from the sides and bottom).
Copyright Passmore Poultry Pluckers Inc. 11October 2013
Three composting methods
1. Bin
2. Windrow
3. Aerated static pile• Active
• Passive
• Others not discussed here:
– In-vessel
– Turned windrow (automated)
Copyright Passmore Poultry Pluckers Inc. 12October 2013
Bin composting
• Natural aeration and frequent turning provide aerobic bacteria with oxygen to break down materials.
• High temperatures, from 32º to 60ºC (90º to 140ºF), are produced when piles are turned every 5-10 days.
• Materials should be stockpiled until enough accumulates to add approximately one cubic metre or yard to the bin.
Copyright Passmore Poultry Pluckers Inc. 13October 2013
Mixing offal waste in bins• Offal should be added in layers with co-composting
materials, rather than in small amounts over time.
• Bury the offal deeply in the pile, making sure you
have at least one foot of material on all sides of the
offal and a two foot porous, absorbent base.
• Wait 2-4 weeks until the carcass material is gone
before turning.
• Spread the meat waste out over a large area, rather
than plopping it all in one pile.
• Water thoroughly.
Copyright Passmore Poultry Pluckers Inc. 14October 2013
BC Ministry of Food Agriculture and FisheriesCopyright Passmore Poultry Pluckers Inc. 15October 2013
Joel Salatin operation
16
Tulaberry Farm, Slocan Valley
• Not shown – lattice layer of poles at base17
Copyright Passmore Poultry Pluckers Inc. 18October 2013
Plastic barrier base,
passive air supply
Copyright Passmore Poultry Pluckers Inc. 19October 2013
Photos credit: Andy Bary, Washington State U20
Compost bin manufactured by Sure Link Fencing Ltd. Slocan Park BC
Copyright Passmore Poultry Pluckers Inc. 21October 2013
http://www.mda.state.mn.u
s/en/Global/MDADocs/ani
mals/compostguide.aspx
Covered
bin
designs
22
Windrow
• National Standard
– The material shall attain a temperature of 55°C or
greater for at least 15 days during the composting
period.
– Also, during the high temperature period, the
windrow shall be turned at least five times.
Copyright Passmore Poultry Pluckers Inc. 23October 2013
http://compost.css.cornell.edu/naturalrenderingFS.pdf 24
BC Ministry of Food Agriculture and FisheriesCopyright Passmore Poultry Pluckers Inc. 25October 2013
Two windrows should be used
• When the first one is large enough, it should
be allowed to decompose undisturbed.
• Additional waste should then be added to the
second windrow.
• Covering the windrow with a layer of finished
compost will help prevent moisture loss and
reduce odour problems.
• Active period from six months to two years.
Copyright Passmore Poultry Pluckers Inc. 26October 2013
Building active aerated static piles
• Floors are first covered with a layer of bulking agent, such as wood chips or finished compost
• The material to be composted is then added, and a topping layer of finished compost or wood chips applied to provide insulation.
• Active period 21-40 days
• National standard : The material will be maintained at operating conditions of 55°C or greater for three days.
Copyright Passmore Poultry Pluckers Inc. 27October 2013
BC Ministry of Food Agriculture and Fisheries
Active aerated static piles
Copyright Passmore Poultry Pluckers Inc. 28October 2013
Puyallup System
Static piles with passive aeration
• 4-5 inch diameter black plastic drain pipe with
pre-drilled holes drilled 8 inches apart on 2
sides of the pipe.
• 2 composting bins
– 4 ft wide by 8 ft long by 5 ft high
– At each time of slaughter, offal was added to one
bin, and additions alternated between the bins.
Copyright Passmore Poultry Pluckers Inc. 29October 2013
Photos credit: Andy Bary, Washington State U30October 2013
Kitsap County 2009
Date
Sep Oct Nov
Tem
pera
ture
, F
ahre
nhe
it
20
40
60
80
100
120
140
160
Pile
Air
Graph credit: Andy Bary, Washington State U
Puyallup SystemTarget temperature achieved
31
Larry Dees, Grand Forks BC
Copyright Passmore Poultry Pluckers Inc. 32October 2013
The final product
• The final composted material should have the
following physical and odour qualities:
– unrecognizable original materials
– dark brown to black colour
– foreign matter/materials less than 1%
– relatively porous structure, not compacted or hard
– no objectionable odours, but an 'earthy' smell.
Copyright Passmore Poultry Pluckers Inc. 33October 2013
Causes and fixes for
objectionable odours
1. Inadequate aeration, allowing anaerobic
digestion to take place.
• Solution: Aerate the composting materials
more frequently.
2. A low C:N ratio.
• Solution: Adjust the C:N ratio by adding more
carbonaceous materials.
3. Wet composting materials.
• Solution: Aerate moreCopyright Passmore Poultry Pluckers Inc. 34October 2013
Use of compost
• Compost nutrient estimates are 7kg N, 2.5kg
P2O5
and 4kg K2O per tonne of compost.
• Reuse finished compost as the base for the
next pile.
• Use on hay, corn, winter wheat, tree
plantations and forestlands.
• Applying to “table-top” crops directly
consumed by humans is not recommended.
Copyright Passmore Poultry Pluckers Inc. 35October 2013
Resources• BC Ministry of Agriculture Composting Factsheet
http://www.agf.gov.bc.ca/resmgmt/publist/300Series/382500-5.pdf
(general; regulations)
• http://agsyst.wsu.edu/PoultryOffal.pdf (Puyallup system)
• http://www.eggfarmers.co.nz/uploads/8E738_Composting_Dead_Poultry.
• http://compost.css.cornell.edu/naturalrenderingFS.pdf (rendering of large
animals)
• http://bqa.wsu.edu/documents/ON%20FARM%20COMPOSTING.pdf
(rendering of large animals)
• http://www.mda.state.mn.us/en/Global/MDADocs/animals/compostguide
.aspx (rendering of large animals)
• http://vermiculture.ca/store/index.php?act=viewProd&productId=87
(compost thermometer)
Copyright Passmore Poultry Pluckers Inc. 36October 2013
Agriculture and Agri‐Food Canada, the BC Ministry of
Agriculture and the Investment Agriculture Foundation of
BC, are pleased to participate in the production of this
presentation.
We are committed to working with our partners to address
issues of importance to the agriculture and agri‐food
industry in British Columbia.
Opinions expressed in this presentation are those of
Passmore Poultry Pluckers Inc. and not necessarily those of
Agriculture and Agri‐Food Canada, the BC Ministry of
Agriculture and the Investment Agriculture Foundation.
Copyright Passmore Poultry Pluckers Inc. 37October 2013