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Uppsala University (2020)

Small-scale Systems for Greywater Reuse and Disposal (Burkina Faso)

Courtney Eklund, Orianna ; Tegelberg, Linda

Titre : Small-scale Systems for Greywater Reuse and Disposal (Burkina Faso)

Auteur : Courtney Eklund, Orianna ; Tegelberg, Linda

Université de soutenance : Uppsala University

Grade : Master Programme in Environmental and Water Engineering 2010

Résumé
Greywater, e.g. wastewater from kitchen, bathroom and shower sources, discarded untreated on the street is a common problem in urban and peri-urban environments in low-income countries ; it damages infrastructure and becomes a health risk due to mosquito breeding and pathogen growth. In water scarce areas, ecological sanitation greywater disposal systems that reuse the greywater to grow plants have been popular as they offer safer disposal methods and can lead to reduced water stress and increased food security. This work aimed at evaluating two such systems – vertical gardens and mulch beds – that were implemented as an alternative to current greywater disposal practices in low-income households in Ouagadougou, Burkina Faso. Literature on greywater reuse and disposal systems and risks connected with greywater irrigation were studied as well as relevant sitespecific parameters. Experiments were carried out on two new vertical gardens in addition to soil analyses, interviews and observations in households where vertical gardens and mulch beds had been in use for several months The major problem with the tested systems was the buildup of a water column in the vertical garden and of standing water in the mulch bed due to overloading and poor dimensioning, which results in anaerobic conditions, a large sludge production and clogging of systems. Other problems in the vertical gardens included direct contact between potentially contaminated greywater and plants and poor water reuse potential. In both cases, it was not advised that the implemented systems continue to be recommended. Suggested improvements for a vertical garden included separated application inlet for greywater and a different design to reduce clogging and increase the water reuse. An improved, larger mulch bed was also suggested. An alternate system, combining primary filtration and horizontal gardening was suggested, but needs further evaluation. Considering the conditions in Ouagadougou and the experienced problems with the implemented systems, it was recommended that leach pits might be the most viable option for greywater disposal until a better functioning and properly dimensioned greywater reuse and disposal system can be found.

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Page publiée le 2 juin 2020