pH and Particle Structure Effects on Silica Removal by Coagulation
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 p...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2012 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/44330 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/44330 |
| Access Level: | acceso abierto |
| Palabra clave: | 676 Coagulation Focused beam reflectance Paper mill effluent Reverse osmosis Silica fouling Industria del papel Ingeniería química Medio ambiente 3312.13 Tecnología de la Madera 3303 Ingeniería y Tecnología Químicas 2391 Química Ambiental |
| Sumario: | 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). |
|---|