According to a NEERI release, a chemo-defluoridation domestic unitconsists of a steel container fitted with a sand filter at itsbottom. In order to reduce the fluroide content, a fluoride bearing water(30 L) is added in the container followed by dosing of the salts ofcalcium and phosphorous chemical coagulants with manual stirring. When these salts are added to the fluoride-bearing water, theygradually get dissolved and precipitated absorbing fluoride fromwater. The water along with the residue is then passed through the sandfilter to get the treated water with fluoride less than thepermissible limit of 1.0 mg/L, the release said. It further said that efficiency of the filter is reduced roughly ina month due to settling of chemical precipitate on the sand filterwhich can then be manually cleaned by removing the top layer of theprecipitate settled on the sand bed. |
The cost of the household unit is about Rs 2000 and the treatmentcost incurred is around 20 paise per litre. The units are suitable for the small fluoride-affected villageswhere community water supply schemes are not economically feasible,the release said. The release informed that 30 household defluoridation units havebeen distributed in Chichkavatha village in Nagpur district incollaboration with the Nagpur Zila Parishad, Sonegaon (Lodhi) GramPanchayat and Bharat Nirman Cell, Nagpur. There are 30 houses and two hand pumps in the village whereconcentration of fluoride is in the range of 1.8-1.9 mg/L (mg perlitre).
In India an estimated 60 million people are affected bydrinking water from well with excessive fluoride content. The effects of excessive fluoride typically manifest into Bonedeformations of children, while in high proportion, solublefluoride salts are toxic and skin or eye contact with them isdangerous. Meanwhile, a demonstration about the usage of the domestic unit wasyesterday given at Chichkavatha village where the NEERI officialsapprised the villagers about the ill-effects of high fluoridecontent. After successful field performance of 80 units installed in Sakharavillage in Yavalmal district in 2010, this is the second villagewhere the units have been set up.
Experts also informed that the chemo-deflouridation units will beinstalled in other fluorosis endemic habitations with support fromMaharashtra Water and Sanitation Department and other agencies.
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