WASTE, Dar es Salaam Sewerage and Sanitation Department
MAPET System (Manual Pit-latrine emptying technology) was a pushcart designed to empty existing pit latrines.
The MAPET System was a human-powered vacuum system made up of two separate systems. A pump operated by a hand piston pump and vacuum tank that are both mounted on a pushcart. This product has been discontinued and marked as a failure due to the inability to source parts and the high initial cost to purchase based on a review of pit latrine technologies.
Goal 6: Clean water and sanitation
Targeted users were individual households or communities without access to sanitation systems.
The components of the MAPET System were sourced in the Netherlands and then assembled in Tanzania.
The MAPET system was purchased from a partner NGO in hopes to set locals up in small businesses removing the fecal sludge from latrines.
Type of toilet
Method of evacuation
How the fecal sludge is stored
The holding volume of the containment
Time until emptying is estimated to be needed
There are two pieces of the MAPET system. The piston pump with the flywheel and the 200-litre vacuum tank. Each is mounted on a pushcart. A hose is connected to the tank and is used to suck the sludge from the pit. When the hand pump is turned, air is sucked out of the vacuum tank and sludge is sucked up into the tank. Depending on the consistency of the sludge, the MAPET can pump up to a height of 3 m.
There is no technical support provided and users are expected to maintain the product on their own.
This product failed due to lack of availability of replacement components.
The goal of the MAPET system was to provide individuals with the product and they would be able to manage their own fecal sludge removal business. The manufacturer also wanted to relieve issues associated with dependence on fossil fuels, demolition of slab, accessibility and local engagement.
As of 2016 the MAPET System had been piloted by Dutch NGO WASTE in Dar es Salaam, Tanzania.
There were no known safety issues with this product.
1. A mixing rod for stirring the waste
2. A hook for picking out waste that would block the suction hose
3. A shovel
4. A chisel and hammer for widening the squatting hole for the suction hose.
Mikhael, G., et al., 2014, Methods and Means for Collection and Transport of Faecal Sludge. Faecal Sludge Management: Systems Approach for Implementation and Operation. London: IWA Publishing, pp. 67-96.
Yoke, P.T., et al., 2009, Pit Latrine Emptying: Technologies, Challenges and Solutions. EWB – UK Research Conference, 2009.
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