How Do Sand Filters Work
(updated from a 2013 blog)
While there are a number of water purification technologies in use all over the world, the technology well-nigh often implemented past Pure Water for the World is the Hydraid® biosand filter. The Hydraid® biosand filter is intended for point-of-use water filtration and tin provide clean water for a family of 8 to x people for more than 10 years.
- Depression in toll
- Requires no power of any kind
- No moving parts
- Simple to use
- Reliable; requires essentially no maintenance
- Modest plenty to fit in any home
- Lightweight
- Nigh indestructible. Well suited to a school and/or home environment.
- Long life (estimated >10 years) with no recurrent expenses.
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Ho-hum sand filtration has been in widespread use across Europe and the Americas for over 200 years. On an individual household calibration, it is ideally suited for point-of-apply filtration by rural, remote populations.
The biosand filter has been extensively tested in laboratories at the Academy of Calgary, MIT and Dartmouth Higher, and has proven both economic and constructive in thousands of field installations.
Initially, the PWW team implemented the original version of the biosand filter that was synthetic of cement. Information technology was heavy and cumbersome and logistically very difficult to get to the remote homes of families nosotros serve. After Dr. Manz developed and patented the plastic Hydraid® biosand filter, we tested this version and found information technology to be much more suitable and effective for the locations in which we typically work.
The Hydraid® biosand filter is based on the concrete filter process but uses a plastic container, making the container itself much lighter and easier to ship. It is about the size of an role water cooler, constructed of medical-grade plastic, and filled with multiple grades of specifically selected and prepared sands and gravels.
Contaminated source h2o is poured into the top of the container through a diffuser plate that controls the rate of flow and prevents disturbing the valuable upper layer of sand.
Removal of most of the contaminants and pathogens from the source water takes place at the superlative of the sand, where a biological layer forms later beingness fed with the organic and inorganic materials that are present in the contaminated water.
This biological layer, or biomass, contains friendly leaner. The biomass is a hostile surround for the organisms that crusade human disease, killing almost of the pathogens past temperature, competition for food, and predation (on a very small-scale scale), while mechanically filtering them from the h2o. Biological destruction and mechanical filtration continue to a lesser extent downward through the sand.
Water pressure forces the h2o through the sand and gravel, up the pipe and out into a clean container. The filtered water is free of contaminants, clear in colour, clean in taste and smell, and condom for homo consumption.
Used correctly, in combination with proper hygiene instruction and preparation, this simple device tin can provide sustainable, reliable safe drinking h2o for a family of 8-10 people for well over x years.
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To watch a cute video created for the Hydraid® biosand filter, click here.
For more detailed information, please come across this document (Biosand Fact Sheet), created by our WASH partner, CAWST (Centre for Affordable Water and Sanitation Technology).
Boosted Sources: www.cawst.org, www.cdc.gov, http://www.make clean-water-for-laymen.com/household-water-filter.html
How Do Sand Filters Work,
Source: https://www.purewaterfortheworld.org/2017/04/12/how-does-a-biosand-filter-work/
Posted by: hildebrandjould1992.blogspot.com
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