What are ventilated improved pit latrines?
A ventilated improved pit latrine (VIP) is similar to a single pit latrine with addition of a vertical vent pipe. Through the aeration in VIPs, odour and fly nuisances are reduced. Excreta, along with anal cleansing materials (water or solids) are deposited into a pit.
How does a ventilated pit latrine work?
In VIP latrines flies are attracted to the top of the vent pipe since that is where the odors come from. If the vent pipe is covered with a fly screen, the flies are unable to enter and lay their eggs. However a few flies will enter the pit via the superstructure and eventually new adult flies will emerge from the pit.
What are the advantages of ventilated improved pit latrine?
Why build a VIP latrine? VIP latrines effectively control odour and flies while still allowing users to clean themselves with hard materials such as newspaper and leaves which may not suitable for use with a pour-flush latrine. Wind blowing over the top of the ventilation pipe causes air in the pipe to rise.
What is the best way to build a pit latrine?
Pit latrines should be constructed on a slight mound so they are higher than the surrounding ground and water at the surface will flow away from the hole. They should also have a lid that can be placed over the hole to reduce problems with flies and odours.
What is the difference between Kvip and VIP?
VIP) was developed by Albert Wright at the Kumasi University of Science and Technology (now the Kwame Nkrumah University of Science and Technology) in the early 1970s. The KVIP is a twin-pit VIP latrine which allows the contents of one pit to compost while the other pit is in use. …
What are the two types of latrine?
There are generally 2 types of toilet bowl types – round and elongated. According to popular opinion, round toilets are better for smaller bathrooms, while elongated toilets are more comfortable to use.
Why vent pipe is installed in VIP latrine?
The VIP latrine allows smells to be drawn out of the vent pipe and thus is more pleasant to use than the normal pit latrine. Flies cannot enter the latrine down the pipe due to the fly screen and if a roof is fitted then any flies breeding in the pit fly up the vent to the light and are also trapped by the fly screen.
What is an improved latrine?
Improved sanitation facilities are defined as those that hygienically separate human waste from human contact. Improved sanitation includes flush or pour-flush to piped sewer system, septic tank pit latrines, ventilated-improved pit latrines, or pit latrines with slab or composting toilets.
What are the advantages and disadvantages of a pit latrine?
The major advantage of PIT latrines is that faeces can be used to produce useful biomass. The main disadvantage is that they are often polluting groundwater if they are not placed carefully.
What is the standard depth of a pit latrine?
three meters
The pit is typically at least three meters (10 ft) deep and one meter (3 ft) across. The hole in the slab should not be larger than 25 cm (10 in) to prevent children falling in. Light should be prevented from entering the pit to reduce access by flies.
How many feet should a pit latrine be?
Therefore, the length of a slab for one of these latrines equals the length of the pit plus at least 150mm.
Why is a VIP latrine called improved?
WEDC (2012) This type of latrine is called a ventilated improved pit (VIP) latrine. VIP latrines effectively control odour and flies while still allowing users to clean themselves with hard materials such as newspaper and leaves which may not suitable for use with a pour-flush latrine.
How deep is a pit latrine?
A pit latrine generally consists of three major parts: a hole in the ground, a concrete slab or floor with a small hole, and a shelter. The shelter is also called an outhouse. The pit is typically at least three meters (10 ft) deep and one meter (3 ft) across.
Why is the vent pipe painted black?
external surface of the vent pipe should be painted black in order to increase the absorption of solar radiation and thus the magnitude of the thermally-induced venting velocity.
What is the difference between improved and unimproved water supplies?
Unimproved water sources include unprotected wells, unprotected springs, surface water (e.g. river, dam or lake), vendor-provided water, bottled water (unless water for other uses is available from an improved source) and tanker truck-provided water.
What are the different types of latrines?
Service type latrines (Conservancy System)
How do you keep pit latrine clean?
Here are some of them:
- #1: Use Vinegar. Natural vinegar has long been known to control foul odor.
- #2: Lime. Lime can also be used to eliminate the odor.
- #3: Use Air Freshener Tablets. Keep these air freshener tablets hanging near the pit.
- #4: Ventilation.
- #5: Integrate crushed BIOCHAR.
What improved latrine?
How far should a pit latrine be from the house?
5 – 10 m
A pit latrine can not be placed just anywhere. Its location should be carefully chosen. The following issues should be taken into account: * It should be placed at a comfortable distance from houses (5 – 10 m), and preferably not near the kitchen.
How does a ventilated improved pit latrine vent pipe work?
When there is no wind, air in the vent pipe will continue to move upwards, if the pipe is being heated by the sun. Figure 1. A ventilated improved pit latrine Vent pipe The VIP latrine differs from a simple pit latrine because it has a ventilation pipe and a more substantial superstructure.
What is the design of a twin pit VIP latrine?
Design details of a twin pit VIP latrine Vent pipe Fly screen securely fitted flush with the top of pipe Pit 1 (not in use) Pit 2 (in use) Pit cover slab Cubicle kept dark to encourage flies to seek light in the vent pipe Vent pipe hole (covered) Squat hole (covered) Outer cover slab (removeable for pit emptying) Inner cover slab 10
How is a latrine pit sealed?
The latrine pit, including its base, is completely sealed with cement mortar in stable soils or with fully mortared brickwork in unstable soils. At a point 2.25 m above the pit base a 75 mm diameter PVC pipe with a sanitary tee is installed which leads to an adjacent soakaway which is at least 1 m away from the pit.
What is the minimum size of venting opening in latrines?
In latrines deslgned with doors the minimum size of ventllation opening(s) should be at least three tlmes the cross—sectional area of the vent pipe (to allow for head losses in the superstructure). 35.