Hermosilla Redondo, María DaphneOrdóñez, RuthBlanco, LauraFuente González, Elena de laBlanco Suárez, María Ángeles2023-06-202023-06-2020121521-412510.1002/ceat.201100527https://hdl.handle.net/20.500.14352/44330This 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 http://onlinelibrary.wiley.com/doi/10.1002/ceat.201100527/abstract.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).engjournal articlehttp://doi.org/10.1002/ceat.201100527open access676CoagulationFocused beam reflectancePaper mill effluentReverse osmosisSilica foulingIndustria del papelIngeniería químicaMedio ambiente3312.13 Tecnología de la Madera3303 Ingeniería y Tecnología Químicas2391 Química Ambiental