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ABSTRACT
This study tends to address the growing concern of increasing wastewater discharged into the environment from industrial processes such as biodiesel production. Therefore, the aim of this work was focused on the purification of wastewater generated from production of biodiesel using aluminium sulphate as the coagulant. The coagulation process was carried out within 48 hours in jar test apparatus using 0.1%, 0.2%, 0.3%, 0.4% and 0.5% (w/v) aluminium sulphate. The treated wastewater was characterization by determining the pH, turbidity, Biological Oxygen Demand (BOD), and Chemical Oxygen Demand (COD). The results show that the coagulant dose of 0.3% reduced the COD to the least value with 64.4%; but the BOD was reduced to 61% at coagulant dose of 0.4%. However, at coagulant dose of 0.2%, the lowest value of turbidity removal (about 98%) was observed within the first four hours of treatment. Though there was no significant reduction of turbidity after the first four hours, but the treated water remained clear from the initial whitish colour even after 48 hours of treatment. This is an indication that aluminium sulphate at low concentration is an effective coagulant for the treatment of wastewater generated from biodiesel production.
