Page d'accueil   |  A propos de cette collection  |  Aide  |  Effacer       Anglais  |  Français  |  Espagnol  
Document complet
Dérouler chapitre
Etendre sommaire
Préférences
vers la section précédente vers la section suivante

fermer ce livreA Guide to the Development of on-site Sanitation (WHO; 1992; 246 pages)
Afficher le documentPreface
fermer ce répertoirePart I. Foundations of sanitary practice
ouvrir ce répertoire et afficher son contenuChapter 1. The need for on-site sanitation
ouvrir ce répertoire et afficher son contenuChapter 2. Sanitation and disease transmission
ouvrir ce répertoire et afficher son contenuChapter 3. Social and cultural considerations
fermer ce répertoireChapter 4. Technical options
Afficher le documentOpen defecation
Afficher le documentShallow pit
Afficher le documentSimple pit latrine
Afficher le documentBorehole latrine
Afficher le documentVentilated pit latrine
Afficher le documentPour-flush latrine
Afficher le documentSingle or double pit
Afficher le documentComposting latrine
Afficher le documentSeptic tank
Afficher le documentAqua-privy
Afficher le documentRemoval systems for excreta
ouvrir ce répertoire et afficher son contenuPart II. Detailed design, construction, operation and maintenance
ouvrir ce répertoire et afficher son contenuPart III. Planning and development of on-site sanitation projects
Afficher le documentReferences
Afficher le documentSelected further reading
Afficher le documentGlossary of terms used in this book
Afficher le documentAnnex 1. Reuse of excreta
Afficher le documentAnnex 2. Sullage
Afficher le documentAnnex 3. Reviewers
Afficher le documentSelected WHO publications of related interest
Afficher le documentBack Cover
 

Single or double pit

In rural and low-density urban areas, the usual practice is to dig a second pit when the one in use is full to within half a metre of the slab. If the superstructure and slab are light and prefabricated they can be moved to a new pit. Otherwise a new superstructure and slab have to be constructed. The first pit is then filled up with soil. After two years, faeces in the first pit will have completely decomposed and even the most persistent pathogens will have been destroyed. When another pit is required the contents of the first pit can be dug out (it is easier to dig than undisturbed soil) and the pit can be used again. The contents of the pit may be used as a soil conditioner.

Alternatively, two lined pits may be constructed, each large enough to take an accumulation of faecal solids over a period of two years or more. One pit is used until it is full, and then the second pit is used until that too is full, by which time the contents of the first pit can be removed and used as a fertilizer with no danger to health. The first pit can then be used again.

Advantages of single pits

Advantages of double pits

Will last for several years if large enough

Once constructed the pits are more or less permanent

 

Easy removal of solids from the pits as they are shallow

 

Pit contents can be safely used as a soil conditioner after 2 years, without treatment

vers la section précédente vers la section suivante

S'il vous plaît envoyez vos commentaires   Anglais  |  Français  |  Espagnol