Study of algal biomass harvesting using cationic guar gum from the natural plant source as flocculant

► Cationic guargum (CGG) was synthesized from natural plant source guargum (GG). ► CGG has higher intrinsic viscosity than GG. ► CGG is proved to be better flocculant than GG towards algal biomass harvesting. ► The optimized dosage was 40 ppm for Chlorella sp. CB4 and 100 ppm for Chlamydomonas sp. CRP7.