Study of the Efficacy of Coagulation-flocculation Process in Domestic Wastewater Treatment Plant (WWTP) From the City of Hattane (MOROCCO)

Naif Al Jadabi, Mohamed Laaouan, Jamal Mabrouki and Souad El Hajjaji

The pollution emerging by wastewater domestic is a serious problem in morocco which has pollution certainly harmful effects on human health and the environment. In order to avert the adverse effects of these pollutants, this domestic wastewater effluent should be treated efficiently. In the present study, we carried out coagulation-flocculation tests on wastewater effluent of the (WWTP Hattane), municipality of the province of Khouribga, Morocco. The aim of this study was to evaluate efficiency: FeCl3.6H2O and Al2(SO4)3.18H2O as the coagulants to eliminate the pollutant load of wastewater domestic using a jar test apparatus (GPB FLC- Didatec, France).In fact, the evolution of physico-chemical pre and post in this treatment was monitored. In this treatment process efficiency evaluation was based on the removal of total suspended solids (TSS), turbidity, chemical oxygen demand (COD) and Biochemical oxygen demand (BOD). The Turbidity and TSS were the best indicators of the effectiveness of this treatment for the optimal dose obtained are which estimated at 1100 mg/l for Al(III) and 1000mg/l for Fe(III) under optimal conditions. In this treatment of wastewater reveal that ferric chloride at dose optimal is the most effective adjuvant in clarifying the wastewater with turbidity reach to 99.26% while reach to 90.43 with Al(III)ion but the rates of abatement of TSS are very near reach to 94.02%,94,92% respectively. Also, the elimination of BOD reach to 83.60%, 69.74 while COD reach at 78.19%, 74.83% consecutively. Results obtained in this study are accompanied with a decrease in pH.Also, these results indicated that coagulation-flocculation process can be useful for pre-treatment option in WWTP.

Volume 12 | Issue 7

Pages: 147-157

DOI: 10.5373/JARDCS/V12I7/20201995