Magnetic seeding coagulation: Effect of Al species and magnetic particles on coagulation efficiency, residual Al, and floc properties

Magnetic seeding coagulation (MSC) process has been used to accelerate flocs sedimentation with an applied magnetic field, offering large handling capacity and low energy consumption. The interactions of three typical Al species, aluminum chloride (AlCl3), Al13O4(OH)247+ polymer (Al13), (AlO4)2Al28(OH)5618+ (Al30), particles (MPs) were examined clarify the MSC process. In traditional (TC) process, aggregation primary Ala-dissolved organic matter (DOM) complexes in-situ-formed polynuclear species generated a average floc size (226 ?m), which was proved be efficient for DOC removal (52.6%). weak connections between dissolved Ala-DOM MPs led negligible changes after in AlCl3. A significant interaction Al13 observed, MPs-Al13-DOM proposed responsible improvement (from 47% 52%) residual total reduction 1.05 0.27 mg L?1) addition. Al30 produced lower fractal dimension (Df = 1.88) than AlCl3 (2.08) (1.99) TC whereas its strength (70.9%) recovery (38.5%) higher others. Although more detached fragments addition, effective these field decrease turbidity colloidal Al30. dependence behavior different can guide application