COMPARATIVE STUDY OF TWO DYNAMIC DECANTERS USED AT THE PASPANGA WATER TREATMENT PLANT IN BURKINA FASO: CASE OF ACCELATOR AND PULSATOR

Water is a basic resource for humans because their survival and some of their activities depend on it. There are several types of water depending on their sources including groundwater and surface water. In its natural state, most water needs to be treated before consumption. The National Water and Sanitation Office (ONEA) is one of the structures responsible at the national level for the purification of this water. The Paspanga water treatment station is an ONEA structure which exploits the water from the Loumbila and Ouaga 3 dams. This raw water follows an entire treatment process which involves the use of hydraulic structures such as decanters before being drinkable. The analysis of turbidity was carried out by nephelometry, pH and conductivity by electrochemistry, and organic matter by titrimetry. The results obtained made it possible to compare the accelator and pulsator decanters. For the same raw water we observed a drop in turbidity ranging from 58 to 83% for the accelator and from 51 to 75% for the pulsator. For a minimum average pH of the raw water of 6.76, the decanted water of the accelator has a minimum average pH of 6.49 and that of the pulsator of 6.46. For the same raw water we observed a drop in organic matter ranging from 22 to 52% for the accelator and from 16 to 41% for the pulsator. From all these results, it appears that the accelator is more efficient than the pulsator.