1. KHEDIDJA BENOUIS - Associate Professor, Department of Energy and Process Engineering, Djillali Liabes University, Algeria.
2. YASSINE KHALFI - Associate Professor, Department of Energy and Process Engineering, Djillali Liabes University,Algeria.
3. SOUFIANE GUELLA - Associate Professor, Department of Energy and Process Engineering, Djillali Liabes University,
Algeria.
4. YASSMINA KHANE - Lecturer, Department of Energy and Process Engineering, Djillali Liabes University, Algeria.
5. AHMED ALAMI - Associate Professor, Department of Renewable Energy, Djillali Liabes University, Algeria.
The coagulation-flocculation process is an essential step in the water treatment chain. It consists of eliminating suspended matter and colloidal substances responsible for the transfer of contaminants into the environment. The efficiency of the process depends on several factors, mainly the pH of the wastewater, the dosage of the coagulant used, the speed and the time of stirring during coagulation. This study aims to optimize the coagulation stage in the municipal wastewater treatment plant of the town of Sidi Bel Abbes (Algeria). Four key factors in this process have been optimized: the initial pH of the wastewater (pHi from 4.5 to 11), doses of coagulants AlCl3,6H2O and FeCl3,6H2O (from 0.1 to 1.5g/L of effluent), stirring speed (from 50 to 200rpm) and stirring time (from 5 to 15mn). Two main response parameters were measured: turbidity and the final pH of the treated wastewater. The results showed that the dosage of AlCl3,6H2O of 1g/L at pH 6.5 and FeCl3,6H2O of 0.1g/L at pH 11 provided the best turbidity removal. The optimum agitation speed is 100 rpm for 5 min.
Process, Coagulation, Flocculation, Optimization, Wastewater, Aluminum, Iron, Environment.