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The target of this study is to have a part in the preservation of sinking waters of Lomé city’s suburbs areas. (Togo). The assessment of physicochemical quality and bacteriological has been carried out on 30 samples using standardized methods (AFNOR). Nitrate elimination tests with activated charcoal and K. FAMBI et al. / Int. J. Biol. Chem. Sci. 15(1): 317-337, 2021 318 disinfecting chlorine for break-point determination have been carried out on waters of high nitrate content on each studied site. Surveys’ results have shown that sinking, carried out in the suburbs’ areas are of 95% manuals. Sinkings are often done without technical orientation due to the easy layer of sedimentary formation. The depth varies from 25 to 35 m. Results showed that sinkings are carried out (over 80%) in an unhealthy environment devoid of sanitation infrastructures. The pH is mostly acid (< 6,5). Waters are salted (about 90%) and 87% of samples are not standard to the WHO recommended values. Nitrates concentration (toxic element) and the iron (undesirable element) are very high, respectively in the proportions of 13% and 6% of tested sinking waters. The whole of tested samples are contaminated by germ indicators from faeces. Tested water samples are not standard to preservation norms of drinking water. Contamination might have resulted as a priority from « foration » techniques and periodic maintenance of the pump. Tests treatment with activated charcoal and the chlorine are effectively revealed and constitute one the measures to be taken into account in water-processing. © 2021 International Formulae Group. All rights reserved.

Qualité et essais de traitement des eaux en milieu périurbain : cas des eaux de forage des cantons Légbassito et Vakpossito (Togo)