Impact of faecal sludge from the attidjin site (lomé) on the physicochemical quality of well water and boreholes

The amount of faecal sludge entering the undeveloped site in Attidjin is changing dramatically, exacerbating pressure on water resources around the site. The aim of the study is to assess the physicochemical quality of water in four concessions near the site. Indeed, water has been collected and treated by physicochemical methods. The organic pollution index OPI for wells is 2.25 and drilling is 3.25.However, the COD/BOD5 ratio ranges from 1.55 ± 0.34 to 2.35 ± 1.02 and exceeds 1.5 WHO values. The pH of the waters is acidic and their conductivity is very high. Metallic trace elements such as Cu, Zn, Ni and Mn have been determined and are above WHO values. For Cu, its contamination factor CF is greater than 6. The metal geoaccumulation index (Igeo) of the faecal sludge spilled is also evaluated. The results showed that Igeo de Zn is close to 2 and that of Cu is close to 1. The Attidjin site has been identified as a source of chemical groundwater pollution. The next studies will be looking at the treatment model for these faecal sludge-contaminated waters.