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| VENT PIPE AND FLY SCREEN |
How to control odour and flies?
A screened ventilation pipe reduces odour and flies. The ventpipe draws out air from the pit or vault, mostly by the action of air passing across the top of the pipe.
(pix
needs modification to show wind direction and inlet of wind into superstructure)
One option for the vent pipe material is to use 110mm PVC. The air that flows out of the pipe is replaced by air passing down the squat hole or pedestal. This is most efficient when the slab and pit collar are sealed and airtight and the head of the pipe is not surrounded by trees.
Any foul odour from the pit or vault does not escape into the superstructure, but is diluted by air and passes out of the pipe into the atmosphere. The vent also helps to remove moist air from the pit or vault which helps to reduce the moisture content of the excreta. Regular addition of soil,wood ash and leaves to the pit can also help to reduce odour.
Flies can be eliminated by using a screen fitted vent pipe. Corrosion resistant aluminum or stainless steel screens must be used. The toilet house must be kept in semi-darkness and a roof is essential.Where the interior of the toilet is kept semi-dark, flies will enter the pipe from the pit or vault attracted towards the light and become trapped by the screen.
A screened ventilation pipe reduces odour and flies. The ventpipe draws out air from the pit or vault, mostly by the action of air passing across the top of the pipe.
(pix
needs modification to show wind direction and inlet of wind into superstructure)
One option for the vent pipe material is to use 110mm PVC. The air that flows out of the pipe is replaced by air passing down the squat hole or pedestal. This is most efficient when the slab and pit collar are sealed and airtight and the head of the pipe is not surrounded by trees.
Any foul odour from the pit or vault does not escape into the superstructure, but is diluted by air and passes out of the pipe into the atmosphere. The vent also helps to remove moist air from the pit or vault which helps to reduce the moisture content of the excreta. Regular addition of soil,wood ash and leaves to the pit can also help to reduce odour.
Flies can be eliminated by using a screen fitted vent pipe. Corrosion resistant aluminum or stainless steel screens must be used. The toilet house must be kept in semi-darkness and a roof is essential.Where the interior of the toilet is kept semi-dark, flies will enter the pipe from the pit or vault attracted towards the light and become trapped by the screen.
 How to ? Cut a piece of wire mesh 30 cm X 30 cmto fit the top of the vent pipe. Using cement plaster it on to the top of the vent pipe. The vent pipe must be 35 cms higher than the roof. |
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