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An EU H2020 project

June 2016 - November 2019



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14 Mar

Field defluoridation experiments - North Tanzania 4-8 February 2019

Field defluoridation experiments of the defluoridation prototype developed in the framework of FLOWERED project have been conducted in North Tanzania from 4 to 8 February 2019 by: Idini Alfredo, Ph.D student from UNICA, Ghiglieri Giorgio, associate professor from UNICA, coordinator of the FLOWERED project, Gutierrez Luciano, associate professor from UniSS and Kajala Simon, Eng. from OIKOS NGO.

The aim of the field activities was to perform the defluoridation experiments with different natural water contaminated by geogenic fluoride (Fig.1). The experiments were performed using a prototype device, made by HTE, in different rural areas and conditions. The second focus was collecting the interviews from local tribe of Meru and Masai to start socio-economic analysis.

Areas of experiments are located in the sub region Oldonyo Sambu, Ngarenanyuki and Ngurdoto around   Mount Meru volcano, Arusha region, North Tanzania.

The prototype has been presented to the technicians and local people at the Ngurdoto Defluoridation Center, a government laboratory focused in the production and improvement of the Bone Char defluoridation system. The defluoridation method was demonstrated and improvement of technological and practical aspect of the prototype (pipe connections, power supply, final filtration, etc.) was discussed.

Defluoridation experiment (label NGO2) has been conducted with natural water from Mayachai Spring that is located near Ngurdoto and from Bule Bule spring in the Uwiro village, in the Ngarenanyuki sub region.

The result of the NGO2 experiment shows that fluoride decrease from 20.9 mg/L (Mayachai Spring), and 8.4 mg/L (Uwiro village, in the Ngarenanyuki sub region) to below the WHO drinkable limit of 1.5 mg/L in less than 2 hours. Also, the PH (ranging from PH 7.2 to 7.12) remains into the WHO drinkable limit.

Experiment was also conducted with water that is more concentrated in F from a borehole, inside the secondary school of Ngarenanyuki.

The results of experiment (label KYU2) show that the concentration of fluoride is reduced from 37 mg/L to 7 mg/L in 6 hours. The drinkable limit has not been reached. This result show the limits of the method and allows exploring possible way to improve the prototype. Interviews of local people was also collected to know their feeling and have their feedback regarding the developed prototype, for socio-economic analysis.

Category: Field Activity


This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement N°690378