biology of composting - biophyt · biology of composting, jf, october 2019 humidity of the material...
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Forschungsinstitut für biologischen Landbau [email protected], www.fibl.org
Biology of composting
Jacques G. Fuchs ([email protected])
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Biology of composting
›What can be composted or treated by anaerobic fermentation?
›Basis of the biology of composting
› The microorganisms serving the compost producer
› The parameters of composting process
Biology of composting, jf, october 2019
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www.fibl.org
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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›Waste of horticulture
›Composting: OK›Anaerobic fermentation: depending on the woody fraction
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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›Animal manure
›Composting: OK›Anaerobic fermentation: OK
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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›Woody organic waste
›Composting: OK›Anaerobic fermentation: inappropriate
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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›Waste of fruits and vegetables
›Composting: OK (in small quantity)›Anaerobic fermentation: OK
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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›Waste from vegetables processing
›Composting: OK (in small quantity)›Anaerobic fermentation: OK
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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›Egg shells
›Composting: inappropriate›Anaerobic fermentation: OK (thermophilic or after sanitation treatment)
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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›Waste from agro-industry
›Composting: inappropriate›Anaerobic digestion: OK
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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›Waste of fish / meat
›Composting: inappropriate›Anaerobic fermentation : OK (after sanitation treatment)
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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›Waste of restaurant
›Composting: inappropriate›Anaerobic fermentation: OK (thermophilic or after sanitation treatment)
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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›In theory, all organic residues can be composted or digested.
›However, not all are easy to handle, biodegradable, and free from toxic and pathogenic germs.
›Depending of the system used, some residues are more or less easy to be treated.
›Depending of the system, some input materials have to be treated before processing (e.g. pasteurization of kitchen waste before mesophilic anaerobic digestion).
›The starting mixture is important for the success of the process.
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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›Composting or anaerobic fermentation ?
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
Humidity of the material
Structural (“woodness”)
Composting (anaerobic) Anaerobic digestion
Cutting from trees or bushesRural green waste
Urban green wasteCooking and food waste
Restaurant wasteSlaughterhouse waste
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›Quality of input materials (levels of undesirables)
›Source-separated organic waste›Each undesirable that does not enter the process does not need to be taken out at the end of it!
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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›Quality of input materials (levels of undesirables)
› Begin of the 1980s: only source-separated organic waste can be composted / treated by anaerobic fermentation. Mechanical biological treatment (MBT) no more allowed.
What can be composted or treated by anaerobic fermentation?
Biology of composting, jf, october 2019
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Basis of the biology of composting
Biology of composting, jf, october 2019
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Basis of the biology of composting
Biology of composting, jf, october 2019
›The microorganisms of composting
› bacteria› fungi › actinomycetes
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Basis of the biology of composting
Biology of composting, jf, october 2019
›The microorganisms of composting
› Bacteria
› aerobic / anaerobic
› very active at the beginning of the process
› responsible for the hot phase
› can not degrade wood efficiently
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Basis of the biology of composting
Biology of composting, jf, october 2019
›The microorganisms of composting
› Fungi
› aerobic
› degrade wood
› creation of stabilized crumbs
› important during maturation stage
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Basis of the biology of composting
Biology of composting, jf, october 2019
›The microorganisms of composting
› Actinomycetes (ray fungus)
› can degrade substances, which can not be degraded with bacteria or fungi e.g. chitin
› responsible for decomposition of difficult materials
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Basis of the biology of composting
Biology of composting, jf, october 2019
›Composting: rotting process
› Phase of decomposition
› Intensive microbiological activity
› Increasing temperature
› Extreme loss in volume
› Natural hygienization
› Phase of maturation (curing)
› Creation of stable humus
› Development of positive characteristics of compost
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Basis of the biology of composting
Biology of composting, jf, october 2019
›Evolution of temperature during composting
Illus
tratio
n: D
r. U
lrich
Gal
li
Duration of process
10
30
50
70
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Basis of the biology of composting
Biology of composting, jf, october 2019
›Evolution of gas composition during composting
Illus
tratio
n: D
r. U
lrich
Gal
li
Duration of process0
10
20
O2
CO2
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Basis of the biology of composting
Biology of composting, jf, october 2019
›Evolution of organic substance during composting
Illus
tratio
n: D
r. U
lrich
Gal
li
Duration of process20
30
40
50
60
70
80
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Basis of the biology of composting
Biology of composting, jf, october 2019
›Evolution of Nmin forms during composting
Illus
tratio
n: D
r. U
lrich
Gal
li
Duration of process0
200
400
600
NO3--NNH4
+-N NO2--N
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Basis of the biology of composting
Biology of composting, jf, october 2019
›Evolution of pH during composting
Illus
tratio
n: D
r. U
lrich
Gal
li
Duration of process4
5
6
7
8
9
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Basis of the biology of composting
Biology of composting, jf, october 2019
›Evolution of compost extract colour during composting
Illus
tratio
n: D
r. U
lrich
Gal
li
Duration of process0
50
100
150
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Basis of the biology of composting
Biology of composting, jf, october 2019
›Evolution of undesirable materials during composting
› metals, earth, plastics, …before
for example 90 kg
degradable material
for example 10 kg non-degradable
material = 10 %
for example 45 kg
degradable material
for example 10 kg non-degradable
material= 18 %
after
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Basis of the biology of composting
Biology of composting, jf, october 2019
›Evolution of undesirable materials during composting
› metals, earth, plastics, …
› other chemical compounds ???
› pathogenic germs and weed seeds
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Basis of the biology of composting
Biology of composting, jf, october 2019
›Final product: compost
› Organic fertilization
› Amelioration of soil structure
› Biological plant protection product
›Compost is not waste !
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Questions ? Discussion ?
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www.biophyt.ch
Biology of composting, jf, october 2019