Guide to Operating a Co-composting Facility in Kenya
1
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Keywords
User’s guide page 4
Co-composting shed
User’s guide page 4
4
3 Areas of 2 chambers each:
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Co-composting
shed in Oloolaiser
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Co-composting shed in Benin (West Africa)
6
7
Material for co-composting
User’s guide page 5 and 6
Y
E
S
N
O
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Composition of a windrow
User’s guide page 7 and 8
N = Nitrogen
C = Carbon
Nitrogen and Carbon is food
for micro-organisms
9
Green waste
Co-composting project in Benin
10
Brown waste
Co-composting project in Benin
11
Composition of a windrow
User’s guide page 7 and 8
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:
1.
UDDT matter and
screening residue (2 cm)
2.
Brown waste (10 cm)
3.
Green waste (5 cm)
D
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Length: 3m ; Width: 2.5m ;
Height: 1.6m
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Too wet: add more brown waste
•
Too dry: add more green waste
12
Windrow layers
Co-composting project in Benin
13
Windrow turning
User’s guide page 9 and 10
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Turning
Air supply
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Favour growth of micro-
organism
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Prevent odours
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Recommendation: 3 to 6 turnings in
total
14
Windrow turning
Co-composting project in Benin
15
Evolution of a windrow: moisture and temperature
User’s guide page 11 and 13
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16
Maturation process
User’s guide page 14
Last turning: day 50
th
Colour
Dark brown (soil like)
Temperature
below 50°C
Small insects and fungus (white
stains) necessary to break down
complex organic material
17
Mature compost
Co-composting project in Benin
18
Screening / storage and bagging
User’s guide page 15
Mature compost is screened
onto the sieve (5 to 10mm
mesh size)
Fine compost is stored in bulks or
bags before selling.
Compost cannot be stored in bags
more than 1 year (risk of dry-out)
Screening residue used to
make a new windrow
19
Screening
Co-composting project in Benin
20
Bagging
Co-composting project in Benin
Explore the operations of a co-composting facility in Kenya through detailed images and descriptions. Learn about the areas within the co-composting shed, materials required, composition of windrows, and the process of turning windrows in the co-composting project. Discover the ideal combinations of green and brown waste, nitrogen and carbon content, and the importance of maintaining the right moisture levels.
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Presentation Transcript
UBSUP - DTF project - KENYA Operation of a Co-composting facility 1
Keywords User s guide page 4 3
Co-composting shed User s guide page 4 3 Areas of 2 chambers each: Area 1: offload and storage of raw material (waste and UDDT waste) and storage of mature compost Area 2 and 3: co- composting process. 2 windrows maximum 4
Co-composting shed in Oloolaiser 5
Material for co-composting User s guide page 5 and 6 NO YES 7
Composition of a windrow User s guide page 7 and 8 N = Nitrogen C = Carbon Nitrogen and Carbon is food for micro-organisms 8
Green waste Co-composting project in Benin 9
Brown waste Co-composting project in Benin 10
Composition of a windrow User s guide page 7 and 8 Dimension: Length: 3m ; Width: 2.5m ; Height: 1.6m Consecutive layers: 1. UDDT matter and screening residue (2 cm) 2. Brown waste (10 cm) 3. Green waste (5 cm) Ideal combination to be determined by YOU (trials and errors) Too wet: add more brown waste Too dry: add more green waste 11
Windrow layers Co-composting project in Benin 12
Windrow turning User s guide page 9 and 10 Co-composting process: 3 months Turning Air supply Favour growth of micro- organism Prevent odours Turning schedule to be determined by YOU (trial and errors) Recommendation: 3 to 6 turnings in total 13
Windrow turning Co-composting project in Benin 14
Evolution of a windrow: moisture and temperature User s guide page 11 and 13 Moisture content between 40 to 60% all throughout Temperature must not exceed 70 C because it prevents microbiological activities. Week 0 to 1: around 65 C favour rapid composting and kill weed seeds, insect larvae and pathogens Week 1 to 7: gradual decrease from 65 C to ambient temperature Week 7 to 12: stabilization at ambient temperature 15
Maturation process User s guide page 14 Last turning: day 50th Colour Dark brown (soil like) Temperature below 50 C Small insects and fungus (white stains) necessary to break down complex organic material 16
Mature compost Co-composting project in Benin 17
Screening / storage and bagging User s guide page 15 Mature compost is screened onto the sieve (5 to 10mm mesh size) Screening residue used to make a new windrow Fine compost is stored in bulks or bags before selling. Compost cannot be stored in bags more than 1 year (risk of dry-out) 18
Screening Co-composting project in Benin 19
Bagging Co-composting project in Benin 20
