pH and Particle Structure Effects on Silica Removal by Coagulation



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Hermosilla, Daphne and Ordóñez, Ruth and Blanco, Laura and de la Fuente González, Elena and Blanco Suárez, Ángeles (2012) pH and Particle Structure Effects on Silica Removal by Coagulation. Chemical Engineering & Technology, 35 (9). pp. 1632-1640. ISSN 1521-4125

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Coagulation is presented as an efficient alternative to reduce the silica content in effluents from recovered-paper mills that are intended to be recycled by a final reverse-osmosis (RO) step. Coagulation pretreatment by several polyaluminum chlorides (PACls) or FeCl3 was optimized prior to the RO process. PACls with low alumina content and high basicity achieved almost a 100 % removal of silica at pH 10.5. A good reduction of the silica content was attained without regulating the pH by adding one of these PACls. Silica removal was related to the structure of the produced clots in which cylindrical particles produced higher silica removal. All coagulants removed more than 50 % of the chemical oxygen demand (COD).

Item Type:Article
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This is the pre-peer reviewed version of the following article: Hermosilla, D., Ordóñez, R., Blanco, L., de la Fuente, E. and Blanco, Á. (2012), pH and Particle Structure Effects on Silica Removal by Coagulation. Chem. Eng. Technol., 35: 1632–1640. doi: 10.1002/ceat.201100527], which has been published in final form at

Uncontrolled Keywords:Coagulation; Focused beam reflectance; Paper mill effluent; Reverse osmosis; Silica fouling
Subjects:Sciences > Chemistry > Paper industry
Sciences > Chemistry > Chemical engineering
Sciences > Chemistry > Environmental conditions
ID Code:26427
Deposited On:02 Dec 2014 09:12
Last Modified:02 Dec 2014 09:12

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