Cloth filter

Developed for use in Bangladesh , the textile filter is a simple and cost-effective appropriate method for reducing contamination of drinking water. Water file Managed in this way: has a Greatly Reduced pathogen count – though it will not Necessarily be perfectly safe, it is an improvement for poor people with limited options.

Filtering water to free it from microorganism has-been an age old practice Among Jains Who Carefully remove the microorganism in the cloth through filtered water in order to follow doctrine of Ahimsa or non-violence, Preventing bread to-any living creature.

Method

The method used in Bangladesh is as follows: It is usually sufficient to rinse the cloth and dry it in the sun for a couple of hours. In the monsoon seasons, it is advisable to use a disinfectant to decontaminate the material.

The preferred cloth is used cotton sari cloth. Other types of clean, used cloth may be used with some effect, though the effectiveness will vary significantly. Used cloth is more effective than new cloth. [1]

Effectiveness

The tissue is most effectively associated with particles and plankton, particularly a type of zooplankton called copepods , within the water. By passing the water through an effective filter, most cholera bacteria and other pathogens are removed. It has been shown to be very difficult to have cholera infections in poor villages where disinfectants and fuel for boiling are difficult to get.

In sub-Saharan Africa where guinea worm infections ( dracunculiasis ) are endemic, infection is prevented by the use of a nylon mesh with pore size of approximately 150 μm to filter the parasite. [2] [3] [4]

An old cotton sari, folded, creates a smaller effective mesh size (approximately 20-μm). This should be small enough to remove all zooplankton, most phytoplankton, and thus a large proportion of the cholera in the water (99%, according to laboratory studies). However, the nylon net with the larger mesh was found to be “almost equally effective.” [2]

The cloth filter provides an initial step of purification, which is usually followed by an initial step, to be followed by further disinfection. However, where there are no other options, water professionals may consider that it is “of course, better than nothing” [5]

Background

The filter cloth has-been Studied and Reported on by Rita Colwell and Anwar Huq from the University of Maryland Biotechnology Institute , together with other Researchers from the United States and Bangladesh . They report that: “it is common practice in villages in Bangladesh to use cloth, often a flat, unfolded piece of an old sari, to filter home-prepared drinks”. [2]

The researchers studied the application of this technique to drinking water, with folded cloth. They studied the size of the cloth, the effect of the cloth on the effective size, the ability of the cloth to remove particles and plankton, as well as the effects of cholera when used in Bangladesh village. [6]

See also

  • cheesecloth
  • Sieve
  • Filtration

References

  1. Jump up^ Moss J (January 27, 2003). “Cloth Filters Fight Cholera” . Development Report . Voice of America.
  2. ^ Jump up to:c Colwell RR, Huq A, Islam MS, et al. (February 2003). “Reduction of cholera in Bangladeshi villages by simple filtration” . Proc Natl Acad Sci USA . 100 (3): 1051-5. PMC  298724  . PMID  12529505 . doi : 10.1073 / pnas.0237386100 .
  3. Jump up^ “Fighting the ‘fiery snake’ in Sudan” . ABC News . Australian Broadcasting Corporation . Reuters. June 6, 2008. The Carter Center distributes cloths and plastic pipes with the help of a machine.
  4. Jump up^ Hopkins DR, Ruiz-Tiben E, Diallo N, PC Withers, Maguire JH (October 2002). “Dracunculiasis eradication: and now, Sudan” . Am. J. Too much. Med. Hyg . 67 (4): 415-22. PMID  12452497 . More than 278,000 cloths were distributed in Sudan in 1995 (compared with 93,000 the year before), and approximately 600,000 or more were distributed each year since then. In 2001, however, in addition to distributing nearly 850,000 filters for household use, more than 7.8 million pipe filters were also distributed throughout endemic areas.
  5. Jump up^ Hogan J (13 January 2003). “Old clothes filter out cholera” . New Scientist .
  6. Jump up^ Huq, Anwar; Mohammed Yunus; Syed Salahuddin Sohel; Abbas Bhuiya; Michael Emch; Stephen P. Luby; Estelle Russek-Cohen; G. Balakrish Nair; R. Bradley Sack; Rita R. Colwell.Awabdeh (2010). “Simple sari cloth filtration of water is durable and continues to protect villagers from cholera in Matlab, Bangladesh” . MBio . 1 (1): e00034-10. doi : 10.1128 / mbio.00034-10 .