Guide to Co-composting Facilities Operation in Kenya and Benin

Explore the user's guide for operating a co-composting facility in Kenya and Benin, covering areas such as material storage, composition of windrows, and the co-composting process. Learn about the ideal layers for windrows, turning schedules, and creating the perfect balance of nitrogen and carbon for effective composting.

• Co-composting
• Facility Operation
• Kenya
• Benin
• Compost

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1. UBSUP - DTF project - KENYA Operation of a Co-composting facility 1

2. 2

3. Keywords User s guide page 4 3

4. 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

5. Co-composting shed in Oloolaiser 5

6. Co-composting shed in Benin (West Africa) 6

7. Material for co-composting User s guide page 5 and 6 NO YES 7

8. Composition of a windrow User s guide page 7 and 8 N = Nitrogen C = Carbon Nitrogen and Carbon is food for micro-organisms 8

9. Green waste Co-composting project in Benin 9

10. Brown waste Co-composting project in Benin 10

11. 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

12. Windrow layers Co-composting project in Benin 12

13. 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

14. Windrow turning Co-composting project in Benin 14

15. 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

16. 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

17. Mature compost Co-composting project in Benin 17

18. 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

19. Screening Co-composting project in Benin 19

20. Bagging Co-composting project in Benin 20