Onen, V.Gocer, M.2020-03-262020-03-262019Onen, V., Gocer, M. (2019). The Effect of Single and Combined Coagulation/Flocculation Methods on the Sedimentation Behavior and Conductivity of Bentonite Suspensions with Different Swelling Potentials. Particulate Science and Technology, 37(7), 827-834.0272-63511548-0046https://dx.doi.org/10.1080/02726351.2018.1454993https://hdl.handle.net/20.500.12395/38265In this study, the sedimentation behavior of bentonite (Na and Ca bentonite) suspensions with different swelling potentials was investigated with single and combined coagulation and flocculation methods. The samples exhibited a negative surface charge over a broad pH range and had a relatively high suspension stability. Al-2(SO4)(3), FeCl3, MgCl2, CaCl2, and NaCl were used as coagulants. All coagulants have provided sedimentation efficiencies higher than 85% with Ca bentonite suspension, but only 22% efficiency was seen with Na bentonite suspensions. The effectiveness of coagulants increased with higher ionic values of the metal salts. Versus monovalent cations, multivalent cations had a greater influence on the zeta potential of the samples. Higher coagulant concentrations enhance the conductivities of the suspensions. In flocculation, anionic (A-150), cationic (C-521) and nonionic (N-100) flocculants were used. For a Ca bentonite suspension, all flocculants have 98% efficiency. The anionic flocculant was more efficient than cationic and nonionic ones for Na bentonite suspension. The dual-flocculation of cationic and anionic flocculant combinations and pre-destabilization via coagulants of Na bentonite suspension were also studied. Better flocculation performance was achieved with these combined methods.en10.1080/02726351.2018.1454993info:eu-repo/semantics/openAccessBentonitecoagulation-flocculationconductivitymono-multivalent cationszeta potentialArticle377823830Q3WOS:000488483300006Q3