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Modelling Faecal Sludge Dewatering Processes in Drying Beds Based on the Results from Tete, Mozambique

Author

Listed:
  • Osvaldo Moiambo

    (CERIS, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal)

  • Raúl Mutevuie

    (CERIS, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal)

  • Filipa Ferreira

    (CERIS, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal)

  • José Matos

    (CERIS, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal)

Abstract

Currently, in sub-Saharan African countries, 65 to 100% of the urban population is served by on-site sanitation systems, typically pit latrines and septic tanks. Faecal sludge dewatering in drying beds is one of the most commonly adopted low-cost treatment technologies in developing countries due to favourable climate conditions in terms of temperature and radiation and because their operation and maintenance are simple. Nevertheless, research in tropical dry zones regarding these processes is scarce. In this paper, a mathematical model for faecal sludge dewatering in sludge drying beds (SDBs) focusing on gravity drainage and evaporation processes is presented and discussed. Experimental campaigns were carried out at a pilot site in Tete, Mozambique, to determine the model parameters. The results suggest that the model can be used to estimate, in similar situations, the dewatering process of different types of faecal sludge. The present research might be considered as a contribution to the design and operation of SDBs, supporting sludge management and allowing the estimation of drying times and optimal loading cycles, namely, the sludge thickness and final moisture content.

Suggested Citation

  • Osvaldo Moiambo & Raúl Mutevuie & Filipa Ferreira & José Matos, 2021. "Modelling Faecal Sludge Dewatering Processes in Drying Beds Based on the Results from Tete, Mozambique," Sustainability, MDPI, vol. 13(16), pages 1-16, August.
  • Handle: RePEc:gam:jsusta:v:13:y:2021:i:16:p:8981-:d:612366
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    Cited by:

    1. Oumaima Mabrouk & Helmi Hamdi & Sami Sayadi & Mohammad A. Al-Ghouti & Mohammed H. Abu-Dieyeh & Nabil Zouari, 2023. "Reuse of Sludge as Organic Soil Amendment: Insights into the Current Situation and Potential Challenges," Sustainability, MDPI, vol. 15(8), pages 1-25, April.

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