Primary treatment of dye wastewater using aloe vera-aided aluminium and magnesium hybrid coagulants

摘要

Hybrid coagulants, aluminium sulphate-Aloe vera (ALAV) and magnesium sulphate-Aloe vera (MGAV) were prepared for the primary treatment of methylene blue (MB) dye wastewater treatment through coagulation-flocculation process. The effects of the independent factors and their interaction on the dye removal (%) were determined using two independent factors, i.e. pH and dosage based on 2~2 full factorial design. All the independent factors and their interaction were significant in removing dye. The dye removal (%) for both ALAV and MGAV were then optimized through central composite design. ALAV was able to remove 50-55% of dye while MGAV was able to remove 60-70% of dye. Therefore, MGAV was proven to be a more effective hybrid coagulant in removing dye.