A simple defluoridator for removing excess fluorides from fluoride‐rich drinking water

Padmasiri, J.P.; Dissanayake, C.B.

doi:10.1080/09603129509356844

Cited by 13 publications

(4 citation statements)

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“…Padmasiri and Dissanayake (1995) discussed the use of burnt bricks as the defluoridating agent. The filter constructed is simple in design and is fabricated from a 225 mm diameter, 1 m PVC pipe length, 20 mm diameter, 1 m PVC pipe length and an elbow bend.…”

Section: Fluoride Geochemistry and Dental Healthmentioning

confidence: 99%

Medical geology in tropical countries with special reference to Sri Lanka

Dissanayake

Chandrajith

2007

Environ Geochem Health

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Sri Lanka provides an ideal opportunity for the study of the effect of geology on human health. The vast majority of the people of Sri Lanka still live in rural areas within areas termed geochemical provinces. Very broadly, one could say that a geochemical province has characteristic chemical composition in soil, water stream sediments and rocks, enabling their delineation from others. The chemical composition is presumed to be have an impact on the health of the inhabitants of the particular geochemical province, particularly because of the fact that their food and water are obtained mostly from the terrain itself. This leads to the concept of "diseases of geochemical origin". Among these are dental fluorosis, iodine deficiency disorders (IDDs) and selenium-based diseases. The Dry Zone of Sri Lanka has several areas rich in groundwater fluoride, the ingestion of which leads to dental fluorosis. Iodine deficiency diseases are more common in the Wet Zone, though their aetiologies are more complicated. Interestingly, it has also been observed that significant proportions of the female population of Sri Lanka are selenium-deficient, which could well be related to the geological environment. Chronic renal failure (CRF) has been observed in some areas of the Dry Zone of Sri Lanka, where there is a relationship of CRF with the mineral content of drinking water. This subject matter falls under the auspices of Medical Geology, a scientific discipline still in its infancy, and much more concerted studies are needed to attract the attention of medical research.

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Section: Fluoride Geochemistry and Dental Healthmentioning

confidence: 99%

Medical geology in tropical countries with special reference to Sri Lanka

Dissanayake

Chandrajith

2007

Environ Geochem Health

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“…The choice of tubular reactors for fluoride removal is frequent in the literature since they allow us to work in a continuous operation mode to increase the volume of treated water per unit time [27]- [29]. The materials required to assemble the reactor are steel and plexiglass, which are both easily available in Ethiopia and allow us to construct the device on site, without the need of importing raw materials or complicate manufacturing [17].…”

Section: System Geometry and Functioningmentioning

confidence: 99%

Preliminary Study and Numerical Investigation of an Electrostatic Unit for the Removal of Fluoride From Thermal Water of Ethiopian Rift Valley

Lodi

Fanari

Fanti

et al. 2020

IEEE J. Multiscale Multiphys. Comput. Tech.

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This article deals with the numerical modeling of the multiphysics investigation of an electric-field-based device for the defluoridation of Ethiopian water to mitigate fluorosis while satisfying the World Health Organization quality requirement for potable water. A tubular reactor with metallic parallel plates, connected to a static voltage source, exerts an electric force on the ion in solution, attracting it to the electrodes. Meanwhile, the ion is drifted by the laminar water flow which, in turn, allows us to separate and collect the F −-rich stream from the potable one. In this system, the electrostatic problem and the mass transport are coupled according to the highly nonlinear modified Poisson-Nernst-Planck-Stokes equations system. Therefore, carefully modeling the dielectric permittivity, the ionic diffusivity, and mobility as function of fluoride concentration and temperature, the set of operating parameters to ensure the highest fluoride removal from Ethiopian thermal water is identified.

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“…A highly efficient, simple house hold defluoridator using burnt bricks was employed in many areas with high fluorosis in Sri Lanka (Padmasiri and Dissanayake, 1995). This defluoridator is suitable for developing countries and is especially suited on account of its easy installation, maintenance, ready availability of the defluoridating raw material used, i.e., burnt bricks, and low cost, thus achieving Village Level Operation and Maintenance status (VLOM) (Figure 4.21).…”

Section: Defluoridation Of High Fluoride Groundwatermentioning

confidence: 99%