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fermer ce livreA Guide to the Development of on-site Sanitation (WHO; 1992; 246 pages)
Afficher le documentPreface
ouvrir ce répertoire et afficher son contenuPart I. Foundations of sanitary practice
fermer ce répertoirePart II. Detailed design, construction, operation and maintenance
ouvrir ce répertoire et afficher son contenuChapter 5. Technical factors affecting excreta disposal
ouvrir ce répertoire et afficher son contenuChapter 6. Operation and maintenance of on-site sanitation
ouvrir ce répertoire et afficher son contenuChapter 7. Components and construction of latrines
fermer ce répertoireChapter. 8 Design examples
Afficher le documentIntroduction
Afficher le documentPit latrine design
Afficher le documentSeptic tank design
Afficher le documentAqua-privy design
Afficher le documentDisposal of effluent from septic tanks and aqua-privies
Afficher le documentComposting toilets
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
 

Disposal of effluent from septic tanks and aqua-privies

Example 8.6

Determine the size of soakpit required in porous silty clay to dispose of the effluent from the septic tank considered in Example 8.5.

From Example 8.5, the sewage flow is 200 litres per day.

From Table 5.4, the infiltration rate for sewage is 20 l per m2 per day.

Therefore, the wall area required is

If the pit is 1.5 m in diameter, then the depth required from the bottom of the pipe from the septic tank to the bottom of the pit is:

Example 8.7

Determine the size of drainage field required in porous silty clay to dispose of the effluent from the septic tank considered in Example 8.4.

From Example 8.4 the sewage flow is 1440 l per day.

From Table 5.4, the infiltration rate for sewage is 20 l per m2 per day.

So the wall area required is

If the effective depth of the trench (the depth from the bottom of the pipe to the bottom of the trench) is 0.6 m, the length of trench required is:

This allows for infiltration on both sides of the trench.

If the plot is large enough, the drainage field should consist of two trenches, each 30 m long, connected in series.

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