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AuthorShamlooh M.
AuthorRimeh A.
AuthorNasser M.S.
AuthorAl-Ghouti M.A.
AuthorEl-Naas M.H.
AuthorQiblawey H.
Available date2022-05-31T19:01:16Z
Publication Date2020
Publication NameSeparation and Purification Technology
ResourceScopus
Identifierhttp://dx.doi.org/10.1016/j.seppur.2019.116462
URIhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85076976933&doi=http://dx.doi.org/10.1016%2fj.seppur.2019.116462&partnerID=40&md5=02493c514e62c0bc808524f943dc796c
URIhttp://hdl.handle.net/10576/31788
AbstractIn this study, the influence of the hybrid coagulation-flocculation system on the flocculation and shear resistivity of bentonite suspension has been investigated. Two short-chained coagulants, polyamine and polyDADMAC, accompanied with low and high Molecular Weight (Mw) long-chained anionic Polyacrylamide (PAM) flocculants have been used to enhance the size and mechanical properties of the produced flocs. Four characterization techniques were used as evaluation criteria of degree of flocculation including turbidity, zeta potential (?), floc size analysis and rheology. Optimum dosages between 5 and 10 mg/L were obtained for flocculants and between 20 and 30 mg/L for coagulants in hybrid systems. Compared to single systems, hybrid systems performed exceptionally well. Removal efficiency of 99% was achieved using hybrid systems producing water with turbidity as low as 1.05 NTU. Although differences were insignificant in the treatment quality, significant improvement was achieved in floc size and rheological behavior. Hybrid systems were able to produce large flocs of more than 400 �m, five times bigger than flocs from the single cationic coagulant systems. Most importantly, rheological testing of produced slurries revealed the remarkable advancement achieved by hybrid systems. Hybrid systems were able to increase the elastic modulus (G?) by more than ten times resulting from the compacted flocs present in the system. Furthermore, resistivity toward shear and oscillations were improved. Ultimately, hybrid systems have surpassed the single cationic systems by achieving slightly better treatment besides producing larger, denser and more resistive flocs. Generally, polyDADMAC performed better than polyamine in hybrid systems. The combination of polyDADMAC with high Mw PAM gave the best separation as well as the largest flocs, while the combination with low Mw PAM resulted in the best rheological properties.
Languageen
PublisherElsevier B.V.
SubjectBentonite
Coagulation
Colloidal suspension
Flocculation
Hybrid
Rheology
TitleEnhancement of flocculation and shear resistivity of bentonite suspension using a hybrid system of organic coagulants and anionic polyelectrolytes
TypeArticle
Volume Number237
dc.accessType Abstract Only


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