title: Designing slanted soil system for greywater treatment for irrigation purposes in rural area of arid regions.
abstract: To solve the unpleasant disposal of greywater in rural area and allow its collection for reuse in gardening, a slanted soil treatment system (SSTS) was designed and installed in two households. Granitic gravel of 1-9 mm size was used as the filter medium. The aim of this study was to design a SSTS and assess its suitability as a treatment system allowing greywater reuse in gardening. The efficiency of the SSTS was assessed based on organic matter and bacterial pollution removal. The developed SSTS allowed the collection of greywater from three main sources (shower, dishwashing and laundry) in rural area. The SSTS is efficient in removing at least 50% of suspended solids, chemical oxygen demand and biological oxygen demand. The study highlighted that, contrary to the common perception, greywater streams in rural area are heavily polluted with faecal indicators. The removal efficiency of faecal indicators was lower than 2 log units, and the bacteriological quality of the effluents is generally higher than the WHO reuse guidelines for restricted irrigation. Longer retention time is required to increase the efficiency. The possibility of reusing the treated greywater as irrigation water is discussed on the basis of various qualitative parameters. The SSTS is a promising greywater treatment system for small communities in the rural area in the Sahelian region. To increase the treatment efficiency, future research will focus on the characteristics of the SSTS, the grain size and the establishment of a pretreatment step.
authors.affiliation: a Joint Research Centre for Water and Climate , International Institute for Water and Environmental Engineering , 01 BP 594 Ouagadougou 01, Burkina Faso.
authors.forename: Y
authors.initials: Y
authors.lastname: Maiga
authors.forename: D
authors.initials: D
authors.lastname: Moyenga
authors.forename: B C
authors.initials: BC
authors.lastname: Nikiema
authors.forename: K
authors.initials: K
authors.lastname: Ushijima
authors.forename: A H
authors.initials: AH
authors.lastname: Maiga
authors.forename: N
authors.initials: N
authors.lastname: Funamizu
mesh_terms: D000383:Agriculture; D004755:Enterobacteriaceae; D012987:Soil; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods; D014873:Water Pollutants
chemical_list: D012987:Soil; D014873:Water Pollutants
keywords: arid region; gardening; greywater reuse; rural area; slanted soil system