Other key documents not available. They are focused on empowering communities to meet their own needs by using a partnership-based, entrepreneurial model. The goal of ACI is a completely locally-driven and sustainable program that involves partnership between schools, their surrounding communities and ACI. All partners work together to sensitize the area in the use and adoption of different types of beneficial technologies, including biosand filters, rainwater harvesting, sanitation, and household high-yield gardens. ACI developed a biosand filter using a plastic container for the filter body in and have received training and follow-up support from CAWST. Currently, their project consists of two main areas in rural communities around the towns of Kisii and Eldoret.
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More Information What is a Biosand Filter? A biosand filter BSF is an adaptation of the traditional slow sand filter, which has been used for community drinking water treatment for years. The biosand filter is smaller about 1 m tall, 0. The filter container can be made of concrete or plastic. It is filled with layers of specially selected and prepared sand and gravel. The sand removes pathogens and suspended solids from contaminated drinking water.
A biological community of bacteria and other micro-organisms grows in the top 2 cm of sand. This is called the biolayer. The micro-organisms in the biolayer eat many of the pathogens in the water, improving the water treatment. You can use any kind of water in the biosand filter — well water, borehole water, pond or river water, tap-stand water, or rainwater. This makes it very convenient for people because they can use whichever water source is closest to home, make it safe to drink.
The water must not have been chlorinated though, or the chlorine will kill the biolayer. The water should also not contain any dangerous chemicals, because the biosand filter cannot remove most chemicals from water.
Contaminated water is poured into the top of the biosand filter at least once per day but not continuously. The water poured into the top of the filter slowly drips through the holes in the diffuser, and flows down through the sand and gravel. Treated water flows out of the outlet tube. No power is required - the filter works by gravity. It should take about 1 hour to get litres of filtered drinking water. Pathogens and suspended solids are removed through biological and physical processes that take place in the sand.
These processes include: mechanical trapping, predation, adsorption, and natural death. What can the biosand filter remove from water? The biosand filter has been studied in the field and in labs. Like other filters, the biosand filter cannot remove dissolved contaminants or chemicals, such as salt, arsenic or fluoride. There is an adaptation of the biosand filter using rusty nails, called the Kanchan Filter, which can remove arsenic from water. CAWST has prepared a summary of laboratory and field studies for the biosand filter.
The biosand filter is best used as one step in a multi-barrier approach to safe drinking water. Different treatment methods remove different things from contaminated water. Although the water may look clear after filtration, there may still be some bacteria and viruses in the water. It is necessary to also disinfect the filtered water to ensure the safest drinking water possible. The most common low-cost methods used around the world to disinfect drinking water are: Chlorine liquid or tablet Boiling History of the Biosand Filter Dr.
David Manz developed the household biosand filter in the s at the University of Calgary, Canada. In , CAWST was founded to provide the professional services needed for the humanitarian distribution of the filter in developing countries. As new research becomes available, CAWST periodically updates the biosand filter design and recommended operating conditions to provide better water treatment. The current recommended filter is Version Download the Manual.
More Information What is a Biosand Filter? A biosand filter BSF is an adaptation of the traditional slow sand filter, which has been used for community drinking water treatment for years. The biosand filter is smaller about 1 m tall, 0. The filter container can be made of concrete or plastic. It is filled with layers of specially selected and prepared sand and gravel. The sand removes pathogens and suspended solids from contaminated drinking water. A biological community of bacteria and other micro-organisms grows in the top 2 cm of sand.
The Biosand Filter
History[ edit ] The household biosand filter was proposed by Dr. David Manz in the late s at the University of Calgary , Canada. The Canadian non-profit company Center for Affordable Water and Sanitation Technology CAWST was co-founded in by David Manz and Camille Dow Baker to promote education and training in water purification and sanitation including using this technology, and to continue developing it. Below this, the diffuser plate prevents disturbance of the biofilm when water is poured into the filter. Water then travels through the sand column, which removes pathogens and suspended solids. Below the sand column, a layer of gravel prevents sand from entering the drainage layer and clogging the outlet tube. Below the separating layer is the drainage layer consisting of coarser gravel that prevents clogging near the base of the outlet tube.
Download Step Assemble! No need for glue yet; just a dry fit for now; gluing comes next. Leave the top lid off. Place an end cap on each collection tube. Connect each collection tube to one of the press fit elbow joints.