Study of the chemical and bacteriological quality of water resources in Hozin, district of the commune of Dangbo in Benin

Abstract

This study was conducted on the watershed of the Ouémé river in the farming area of Hozin. It focused on the monitoring of the physico-chemical and bacteriological contents of the surface and underground water. For this purpose two campaigns were carried out on thirteen sites over the sampling of water from different sources (water drilling, devices-ordinary wells and river water). The two sampling operations match with the beginning and the end of the rice cultivation period in area study. The results obtained show that ammonium and iron concentrations exceed the regulatory limits set by WHO. Similarly, the values of BOD5 and COD were out of the ordinary. It should also be noted that the P2 well has higher levels than the average for several parameters studied. Surface waters were more polluted than groundwater excepted well P2. The microbiological parameters indicate a water contamination by faecal streptococci, faecal and total coliforms.