International Journal of Academic Health and Medical Research (IJAHMR)   Year: 2022 | Volume: 6 | Issue: 7 | Page No.: 5-12 Treatment by Slow Filtration on Charcoal, Sand and Gravel of Raw Domestic Wastewater from the City of Conakry, Guinea Download PDF Daloba SOUMAH, Demba MAGASSOUBA, Ansoumane SAKOUVOGUI, Mamby KEITA Abstract: This present study aims to treat raw domestic wastewater from the city of Conakry in the Republic of Guinea by the method of filtration on charcoal, sand and gravel. Wastewater has different compositions and comes from various origins and constitutes a problem for nature when it is discharged without undergoing prior treatment. In order to show the interest of their purification, we carried out the treatment by a trial of domestic wastewater from the five (5) municipalities of Conakry (Kaloum, Matam, Matoto, Ratoma and Dixin). Wastewater of different compositions and origins poses a problem for nature when discharged without undergoing prior treatment. In order to show the interest of their purification, we presented in this work a trial of treatment of domestic wastewater of the city of Conakry by filtration from sand, gravel and coal. After treatment of raw domestic wastewater by slow filtration on charcoal, gravel and sand, bacteriological analyzes of twenty-five (25) wastewater samples still show the presence of faecal coliforms/E.coli (CF) and faecal streptococci (SF) in water samples but with smaller values ??compared to untreated water. The treatment or abatement rates varied from 99.95% to 99.99% for CFs and from 99.97% to 99.99% for SFs, which shows good efficiency of the filtration treatment device executed. Parasitological analyzes revealed the total absence of parasites (Entaboiba histolytica, Ascaris, Pinworm, Fasciola hepatica and Trichuris). According to standards, treated water can be used in agriculture, on construction sites and can be discharged into the natural environment without danger.