Defluoridation

What is fluorisis

The disease known as fluorosis is due to fluoride poisoning. Fluoride is a geogenic pollutant. It is present in rocks and soils throughout the earth's crust, and thus it is linked to an excessive concentration of fluoride in underground drinking water. It is endemic in over 25 countries. Nearly 300 M people worldwide are potentially affected by dental or skeletal fluorosis. In the Ethiopian Rift Valley, 41% of the drinking-water sources have a fluoride concentration of geological origin exceeding the limit of 1.5 mg/L established by the World Health Organisation.

As a consequence, more than 14 million people in Ethiopia, nearly 15 % of the population, have already developed dental and skeletal fluorosis in various degrees of severity. Despite several attempts to reduce the total fluoride concentration in potable water using simple and low-cost defluoridation methods for use at household level, the activities aiming at the mitigation of fluorosis in Ethiopia are still at the very initial stages.

Defluoridation technologies includes

  • Precipitation methods

  • Membrane processes

  • Ion exchange methods

  • Adsorption methods

 

The novel adsorbent material to be implemented is based on a natural zeolite using cost efficient and little maintenance process with no energy demands. Furthermore, the exhausted adsorbent will be reused for soil conditioning (for improving soil quality), adding extra-value to the adsorbent. This creates climate resilience and an extra protection of the natural environment of the area where the defluoridation system installed. 

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