Investigation of Olive Mill Wastewater Treatability with Combined Acid Cracking and Coagulation-Flocculation the Treatability of Olive Mill Wastewater with Acid Cracking and Coagulation-Flocculation
The main aim of this study is to investigate the chemical oxygen demand (COD) and color removal from olive
mill wastewater using combined acid cracking and coagulation-flocculation processes. Initially, acid cracking was performed
in jar test with reaction time of 15 min and sedimentation time 2h at constant pH of 1.5 using hydrochloric acid (HCl).
Afterwards, coagulation process was operated with rapid mixing (150 rpm) of 5 min and slow mixing (30 rpm) of 30 min at
pH 4.0 to evaluate the effect of varying coagulant doses (1000-5000 mg Fe3+/L) on acid cracked effluents. Acid cracking and
coagulation-flocculation performance were evaluated by measurement of COD, color and suspended solid (SS). Maximum
COD and color (as Pt-Co) removal during combined acid cracking/coagulation-flocculation process were 52.59% and
28.52% at 5000 mg Fe3+/L concentration, respectively. As a result, combination of acid cracking and coagulationflocculation
processes provided higher color, COD and suspended solid removal than alone acid cracking process.
Keywords - Olive oil wastewater; coagulation; iron chloride; acid cracking; hydrochloric acid