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  • Decentralised Co-Digestion of Faecal Sludge with Organic Solid Waste

    Case Study in Maseru, Lesotho Technologies for Economic Development (TED), Lesotho

    Bremen Overseas Research and Development Association (Borda), Germany

    Swiss Federal Institute of Aquatic Science and Technology (Eawag), Switzerland;

    Department of Water and Sanitation in Developing Countries (Sandec)

    Dbendorf, 11. Mai 2009

    Christian Mller

  • Decentralised Co-Digestion of Faecal Sludge with Organic Solid Waste, Lesotho 2 / 36

    Acknowledgement

    The author would like to thank the numerous individuals for their support in various matters. They have committed their valuable time to provide different kind of information being essential to finalise this study. For that I am very grateful.

    First I would like to thank Mantopi Lebofa and Andreas Schmidt for enabling me a comfortable stay in Maseru by supporting me, especially in administrative and logistical matters. Also thanks to all TED-employee who helped me conducting my work in the field and in the office.

    Special thank goes to Christopher Kellner for his short, but very intense support in Maseru.

    Special thank also goes to Yvonne Voegeli for supervising me and to Urs Baier for answering all techni-cal, chemical and biological questions regarding the conducted gas and effluent measurements.

    Thanks also to Adrian Amman for helping us in conducting heavy metal analysis at Eawag.

    Thanks to Christian Lohri and Florian Heeb for their valuable input in various matters!

  • Decentralised Co-Digestion of Faecal Sludge with Organic Solid Waste, Lesotho 3 / 36

    Table of contents

    Abbreviations................................................................................................................................ 6

    1. Summary .................................................................................................................................. 7

    2. Background ....................................................................................................................... 8 2.1. Anaerobic Digestion in Low and Middle-Income Countries ........................................... 8

    2.2. Situation in Lesotho ....................................................................................................... 9

    3. Objectives........................................................................................................................ 10

    4. Introduction...................................................................................................................... 11 4.1. Technologies for Economic Development (TED)......................................................... 11

    4.2. DEWATSSystem of TED-Borda................................................................................. 12

    5. Methodology .................................................................................................................... 14 5.1. Approach...................................................................................................................... 14

    5.2. Selection of plants........................................................................................................ 16

    6. Location of Biogas Plants ................................................................................................ 17

    7. Characteristics of Biogas Plants...................................................................................... 18 7.1. Garden Site.................................................................................................................. 18

    7.2. Me Palesa .................................................................................................................... 19

    7.3. Childrens home............................................................................................................ 20

    7.4. Mr Monethi ................................................................................................................... 21

    7.5. Mrs Ntsihele ................................................................................................................. 22

    7.6. Me Lerato Flower House ........................................................................................... 23

    7.7. Mazenod ...................................................................................................................... 24

    7.8. Mrs Nthama ................................................................................................................. 25

    8. Summary of Results ........................................................................................................ 26 8.1. Treatment Performance of ABR and PGF ................................................................... 26

    8.2. Biogas Production & Consumption .............................................................................. 28

  • Decentralised Co-Digestion of Faecal Sludge with Organic Solid Waste, Lesotho 4 / 36

    8.3. Harmful Substances in Effluent.................................................................................... 29

    8.4. Economical Aspects..................................................................................................... 30

    8.5. Current Problems & Open Questions .......................................................................... 31

    9. Conclusions ..................................................................................................................... 32

    10. Outlook ............................................................................................................................ 33

    11. Contacts .......................................................................................................................... 34

    12. Literature ......................................................................................................................... 35

    13. Appendix.......................................................................................................................... 36 13.1. Picture Series Garden Site .......................................................................................... 36

    13.2. Garden Site Effluent Analysis Table ............................................................................ 36

    13.3. Garden Site Effluent Analysis Figures ......................................................................... 36

    13.4. Garden Site Biogas Production & Water Consumption ............................................... 36

    13.5. Picture Series Me Palesa............................................................................................. 36

    13.6. Me Palesa Effluent Analysis Table .............................................................................. 36

    13.7. Me Palesa Effluent Analysis Figures ........................................................................... 36

    13.8. Me Palesa Biogas Production & Water Consumption.................................................. 36

    13.9. Me Palesa Additional Feedstock.................................................................................. 36

    13.10. Picture Series Childrens Home.................................................................................... 36

    13.11. Childrens Home Effluent Analysis................................................................................ 36

    13.12. Childrens Home Biogas Production ............................................................................. 36

    13.13. Picture Series Mr Monethi............................................................................................ 36

    13.14. Mr Monethi Effluent Analysis ....................................................................................... 36

    13.15. Mr Monethi Biogas Production..................................................................................... 36

    13.16. Picture Series Mrs Ntsihele.......................................................................................... 36

    13.17. Mrs Ntsihele Effluent Analysis ..................................................................................... 36

    13.18. Mrs Ntsihele Biogas Consumption............................................................................... 36

    13.19. Mrs Ntsihele Additional Feedstock............................................................................... 36

  • Decentralised Co-Digestion of Faecal Sludge with Organic Solid Waste, Lesotho 5 / 36

    13.20. Picture Series Mazenod............................................................................................... 36

    13.21. Mazenod Effluent Analysis........................................................................................... 36

    13.22. Mazenod Biogas Consumption Table .......................................................................... 36

    13.23. Mazenod Biogas Consumption Figure......................................................................... 36

    13.24. Picture Series Me Lerato ............................................................................................. 36

    13.25. Me Lerato Effluent Analysis ......................................................................................... 36

    13.26. Me Lerato Biogas Consumption Table......................................................................... 36

    13.27. Me Lerato Biogas Consumption Figure ....................................................................... 36

    13.28. Picture Series Mrs Nthama ...............

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