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cerrar este libroA Guide to the Development of on-site Sanitation (WHO; 1992; 246 pages)
Ver el documentoPreface
abrir esta carpeta y ver su contenidoPart I. Foundations of sanitary practice
cerrar esta carpetaPart II. Detailed design, construction, operation and maintenance
abrir esta carpeta y ver su contenidoChapter 5. Technical factors affecting excreta disposal
abrir esta carpeta y ver su contenidoChapter 6. Operation and maintenance of on-site sanitation
abrir esta carpeta y ver su contenidoChapter 7. Components and construction of latrines
cerrar esta carpetaChapter. 8 Design examples
Ver el documentoIntroduction
Ver el documentoPit latrine design
Ver el documentoSeptic tank design
Ver el documentoAqua-privy design
Ver el documentoDisposal of effluent from septic tanks and aqua-privies
Ver el documentoComposting toilets
abrir esta carpeta y ver su contenidoPart III. Planning and development of on-site sanitation projects
Ver el documentoReferences
Ver el documentoSelected further reading
Ver el documentoGlossary of terms used in this book
Ver el documentoAnnex 1. Reuse of excreta
Ver el documentoAnnex 2. Sullage
Ver el documentoAnnex 3. Reviewers
Ver el documentoSelected WHO publications of related interest
Ver el documentoBack 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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