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Domestic low-tech anaerobic digesters in Guiné-Bissau: a bench-scale preliminary study on locally available waste and wastewater

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  • Andrea Gallia
  • Davide Veronesi
  • Umaro Embaló
  • Filippo Pongiglione
  • Fabrizio Adani
  • Andrea Schievano

Abstract

Solid organic waste (SOW) and sewage (SEW), in developing contexts as Guiné-Bissau, can be converted into biogas in domestic low-tech anaerobic digesters (AD), avoiding their dispersion in the environment (cause of infective diseases) and simultaneously providing local sustainable/clean fuel to substitute firewood (cause of deforestation and respiratory diseases). Here, SOW and SEW, sampled from local markets/households of Bissau City, were processed in a bench-scale reactor, to define the potentials of low-tech mesophilic (30–37 °C) AD in removing pathogen microbial population, responsible for infective diseases spreading through untreated SOW/SEW and in domestic fuel generation in substitution to firewood. Pathogens removal above 99.9 % were obtained for E. coli and Streptococci. Considering a target scenario (4-persons household unit), a low-tech AD of 2.35 m 3 functional volume, co-digesting 32 L day −1 of SEW and 8 kg day −1 of SOW, would produce about $$1. 5\, {\text{Sm}}^{ 3}_{\text{biogas}} {\text{day}}^{ - 1}$$ 1.5 Sm biogas 3 day - 1 and substitute nearly 11 kg day −1 of firewood for cooking needs, avoiding black carbon particles emissions and inhalation in households. Alternatively, ten biogas lamps could work for 3 h day −1 or a 1-kW electric power generator run for over 2 h day −1 , with important socio-economic benefits. Finally, firewood substitution and the use of digestate as soil conditioner can simultaneously contribute in limiting deforestation and desertification, particularly in transition sub-Saharan tropical areas, such as Guiné-Bissau. Copyright Springer Science+Business Media Dordrecht 2015

Suggested Citation

  • Andrea Gallia & Davide Veronesi & Umaro Embaló & Filippo Pongiglione & Fabrizio Adani & Andrea Schievano, 2015. "Domestic low-tech anaerobic digesters in Guiné-Bissau: a bench-scale preliminary study on locally available waste and wastewater," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 17(5), pages 1227-1241, October.
  • Handle: RePEc:spr:endesu:v:17:y:2015:i:5:p:1227-1241
    DOI: 10.1007/s10668-014-9602-1
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    References listed on IDEAS

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