Feasibility Study of the Implementation of a Wastewater Treatment Plant in the City of Tulear Madagascar 2018

The city of Tulear is undergoing environmental degradation. wastewater heavily polluted, the average values observed for biological oxygen demand (282,347 ± 76,907 mg.L-1), chemical (579,302 161,102 and suspended solids (859,114 816,707 mg.L-1) are above standard discharge values. This study allowed us to design a treatment system make technical, economic, social assessment plant. Thus, method chosen physico-chemical process coagulation – flocculation –filtration. Indeed, population 368,020 inhabitants, hourly rate estimated at 662.436 m3/d. In addition, number bars grids n°1 n°2 respectively 34 140, surface sedimentation basin 204,5m2, optimal dose coagulant (Al2(SO4)3) flocculant (polyacrylamide) coagulation-flocculation 300 mg.L-1and 2 this gives considerable drop in order 15,22 mg.L-1after treatment. For settling basin, volume clarifier 306,68m3, finally sludge produced 1613,66 m3.