The effect of single and combined coagulation/flocculation methods on the sedimentation behavior and conductivity of bentonite suspensions with different swelling potentials
Yükleniyor...
Dosyalar
Tarih
2019
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
TAYLOR & FRANCIS INC
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In 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.
Açıklama
Anahtar Kelimeler
Bentonite, coagulation-flocculation, conductivity, mono-multivalent cations, zeta potential
Kaynak
PARTICULATE SCIENCE AND TECHNOLOGY
WoS Q Değeri
Q3
Scopus Q Değeri
Q3
Cilt
37
Sayı
7
Künye
Onen, 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.
