Pdf biosand filter construction guide affordable point of use. Currently, their project consists of two main areas in rural communities around the towns of kisii and eldoret. If it is sitting on the ground, it will come up to your waist, or higher. There is an adaptation of the biosand filter using rusty nails, called the kanchan filter, which can remove arsenic from water. If you do not get the right kind of sand, or do not prepare the sand properly, the biosand filter will not work well.
How to build a high quality water filter using sand. Cawst 2009 the biosand filter is an innovation on traditional slow sand water filters which have been used for community water treatment for hundreds of years cawst 2009, specifically designed for intermittent or household use. A biosand filter bsf is an adaptation of the traditional slow sand filter, which has been used for community drinking water treatment for 200 years. An estimated 320,000 bsfs have been installed throughout the world in more than 70 counties17. The biosand filter bsf is a simple household water treatment device, which is an innovation on traditional slow sand filters specifically designed for intermittent use. She is cofounder of the notforprofit engineering consultancy centre for affordable water and sanitation technology cawst. John 2102012 this manual details the design principles and communicates the assembly and installation procedures for a 10 inch pvc pipe biosand filter. Household water treatment and safe storage implementation case study. Cdes can take orders for filters starting at the launch. Cawst centre for affordable water and sanitation technology. The biosand water filter bsf is a technology being implemented in 70 countries worldwide to address water quality concerns. Imagine no power, no water pumps, no water filters, no water purification whatsoever, being available to you.
Slow sand filter schematic cawst slow sand filtration cdc pdf pdf 2 pages a slow sand filter is a sand filter adapted for household use. In this manual, the biosand filter is drawn in many ways. A full range of water, sanitation, and hygiene topics. This awardwinning water filtration technology was developed by dr. Biosand filter effectiveness is greatly influenced by the presence and quality of filter components, the quality of filter construction, and the dimensions of the filter. Operation of biosand filters a laymans guide to clean water. In this thesis, cawsts biosand filter manual 2009 have had a great. Biosand technology is open source and royalty free, allowing us to build as many as our budget will allow. It also describes the steps to construct, install and monitor version 10 biosand filters. The materials to construct the biosand filter are all available locally and are very affordable.
The biosand filter the biosand filter bsf is a householdscale, intermittentlyoperated slow sand filter invented in its current form by dr. Camille dow baker is a canadian humanitarian and engineer. Imagine no power, no water pumps, no water filters, no water purification whatsoever being available to you. Alternatively, hydraid biosand water filter is a privately owned company that holds a license for a plastic biosand filter design. Aci developed a biosand filter using a plastic container for the filter body in 2007 and have received training and followup support from cawst. Specifically, this manual is designed for cawst clients. Biosand filter construction manual wash education and training. Cawsts education and training resources are open content. Cawst and the authors hereby provide permission to reproduce all or portions of this manual. Dhan biosand filters are household sand filters developed by canadian engineers promoted by dhan foundation. The history of the biosand water filter is well documented in photographs. The centre for affordable water and sanitation technology cawst developed a great biosand filter construction guide that has lots of useful information. Biosand filter for technicians participant manual iv drawings of the biosand filter the biosand filter is a large box. During the launch, local aci staff explain how the program works, introduce the cde.
The biosand water filter is an adaptation of slowsand filtration that is designed for use by families at the household level. This allows a filter loading rate of 400 literhr, and a clean water flow rate 0. Cdes receive a financial incentive from aci for monthly sales that exceed 5 filters. As of june 2011, cawst estimates that over 300,000 biosand filters have been installed in more than 69 countries around the world. With 19,000 filters in place we have brought clean water to more than 115,000 people. Awareness of how the biosand water filter developed brings a deeper appreciation for the innovation that it is and recognizes the numerous players in the process. The history behind this biosand filter resource we started this website in 2004, primarily as a resource for people wanting to know more about household biosand filtration. Biosand filter for technicians, by cawst my personal thoughts.
Doc modified biosand filter for the indigenous people of. A sustainable option for household treatment of drinking water 299 particulate material in the top surface of the filtering media will reduce the flow rate through the filter. It should be noted that the biosand filter cannot be relied upon to remove certain or all forms of water contamination. The actual flow rate will fluctuate over the filter cleaning cycle and between filters. At the top of the filter there is a tightly fitted lid, which prevents contamination and unwanted.
Biosand filter submitted by omills on mon, 20111010 9. Cawst s education and training resources are open content. The biosand filter is comprised of a container plastic or concrete and is about the size of an office water cooler. Dr manz has trained many organizations on the design, construction, installation, operation and maintenance of the biosand filter. The biosand filter presented to the who stakeholder forum on household water management january 30, 2007.
In the version 10 filter, the volume of the water reservoir is equal to the pore space volume of the sand layer. The content on this page has been adapted from publications of the centre for affordable water and sanitation technology cawst. Practice% 20generic%20themetriplewinsforsustainabledevelopmentweb. Biosand filter manual 1 jul07 introduction to cawst the history the centre for affordable water and sanitation technology cawst was founded in 2001 by current president and ceo, camille dow baker and dr. The filter design is inspired by the opensource biosand filtration technology but uses a lightweight plastic housing instead of concrete. It has an inset plastic pipe and is filled with layers of sand and gravel. As water flows through the filter, physical straining removes pathogens, iron, turbidity and manganese from. The thicker the layer, the more effective the filter.
How the biosand water filter works samaritans purse. Organic material, living and dead, silt, clay, and particulates on filter bed. Water is poured into the top of the column and spends a period of time in contact with the sand. Via siphoning principles, the top level of water will remain at exactly the highest point of your siphon tube. Centre for affordable water and sanitation technology. Biosand filters remove pathogens and suspended solids from water using biological and physical processes that take place in a sand column covered with a biofilm. Bsfs have been shown to remove heavy metals, turbidity, bacteria, viruses and protozoa. The hydraid biosand filter is a plasticbodied type of biosand filter bsf sold by nativeenergy. The generic dimensions for a basic cawst biosand filter is a 400mm by 900mm 7. Ive attached a pdf copy of this document to this instructable for your knowledge and reading pleasure. Dirty water is poured into the top of the biosand filter, where a diffuser plate evenly distributes the.
Affordable water and sanitation technology cawst, 2009. It made use of an experimental method of research that is lighter, durable and cheap filter to improve water quality for. Pdf in kenya close to 50% of the rural population have access to improved drinking water as a result of. Good maintenance practices of the biosand filter will ensure good quality water. Please note that although commonly referred to as the biosand filter external, the biosand filter terminology is trademarked to one particular design, and this page encompasses all slow sand filters.
When installed and used properly, the bsf has been proven effective in numerous studies to remove 90 to 99% of waterborne pathogens cawst1 2006. Improving household drinking water quality use of biosand. A bsf consists of a concrete or plastic container filled with specially selected and prepared sand and gravel. Performance of intermittently operated slow sand filters. Biosand filter construction manual without appendices section, august 2012. Cawst teaches people how to get safe drinking water, sanitation and hygiene in their own homes, using simple, affordable technologies. In addition to installing water filters, literacy classes and libraries are offered to young village women providing basic reading, writing and math skills. A mean turbidity removal of 82% was observed resulting in a mean filtered water turbidity of 0. This also applies to the consumption of water from the biosand filter. This is the biosand filter construction manual without the four appendices.
At the time, we also had the idea to try to produce a cheap plastic stackable biosand filter, which we envisaged could be produced en masse and distributed via bush shops. As of august 2011, aci has implemented more than 1,800 biosand filters in kenya. David manz developed the household biosand filter in the 1990s at the university of calgary, canada. This household devices is build with local materials. Ppt biosand filtration bsf powerpoint presentation. For the concrete version 10 biosand filter developed by cawst, it has been determined to be not more than 400 litershoursquare meter. He also cofounded cawst in 2001 to provide the professional services needed for the humanitarian distribution of. Strategies for implementing biosand water filter projects. She has held senior positions in the petroleum industry, received national and international honors and was president and ceo of cawst until september 2011. The short courses were being demanded after the success of the nicaraguan project was discovered. The trick to turn an ordinary sand filter into a biosand filter is pretty simple in a cleverly elegant way you simply run a thin tube from the outflow on bottom back up to the top before it loops back down to your cleanwatercollecting bottle.
Like other filters, the biosand filter cannot remove dissolved contaminants or chemicals, such as salt, arsenic or fluoride. Cawst has prepared a summary of laboratory and field studies for the biosand filter. A biosand filter bsf is a pointofuse water treatment system adapted from traditional slow sand filters. This illustrated manual describes what a biosand filter is and how it works. David manz, who was the inventor of a simple device for. Water, is our most valuable resource on this planet. The biosand filter construction manual describes what a biosand filter is and how it works. This allows the microorganisms living in the sand to remove pathogens from the water. Bsfs are columns of finely crushed rock sand on which microorganisms are living. Effectiveness and acceptability of smaller biosand filters. The overall product requires extremely low maintenance, a replacing of the sand and gravel whenever the flow rate is.
Cawst is a canadian nonprofit organization focused on the principle that clean water changes lives. Biosand filtration bsf 1 biosand filtration bsf fluidivas lindsey ehinger, laura mar, stephanie wedekind, kim wilson. A study was conducted to construct a modified biosand filter and modified the filter media for the indigenous people of palawan. Manzwaterinfo biosand water filter, biosand water filter.
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