2026-06-29T02:10:22Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/339202025-03-18T12:48:54Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Latour, Isabel
author
Miranda Carreño, Rubén
author
Blanco Suárez, María Ángeles
2023-06-19T13:31:07Z
2023-06-19T13:31:07Z
2014
Latour, Isabel, et al. «Silica Removal in Industrial Effluents with High Silica Content and Low Hardness». Environmental Science and Pollution Research, vol. 21, n.o 16, agosto de 2014, pp. 9832-42. DOI.org (Crossref), https://doi.org/10.1007/s11356-014-2906-8.
0944-1344
10.1007/s11356-014-2906-8
https://hdl.handle.net/20.500.14352/33920
1614-7499
http://doi.org/10.1007/s11356-014-2906-8
High silica content of paper mill effluents is limiting their regeneration and reuse after membrane treatments such as reverse osmosis (RO). Silica removal during softening processes is a common treatment; however, the effluent from the paper mill studied has a low hardness content which makes necessary the addition of magnesium compounds to increase silica removal. Two soluble magnesium compounds (MgCl2∙6H2O and MgSO4∙7H2O) were tested at five dosages (250-1500 mg/L) and different initial pHs. High removal rates (80-90%) were obtained with both products at the highest pH tested (11.5). With these removal efficiencies, it is possible to work at high RO recoveries (75-85%) without silica scaling. Although pH regulation significantly increased the conductivity of the waters (at pH 11.5 from 2.1 mS/cm to 3.7-4.0 mS/cm), this could be partially solved by using Ca(OH)2 instead of NaOH as pH regulator (final conductivity around 3.0 mS/cm). Maximum chemical oxygen demand (COD) removal obtained with caustic soda was lower than with lime (15% vs. 30%). Additionally, the combined use of a polyaluminum coagulant during the softening process was studied; the coagulant, however, did not significantly improve silica removal, obtaining a maximum increase of only 10%.
eng
Silica removal in industrial effluents with high silica content and low hardness
journal article
URL
https://docta.ucm.es/bitstreams/4996a0c0-b4fb-4556-96b6-1c6416277b46/download
File
MD5
61563ab3be45c43297f59b8b31da8ba5
392239
application/pdf
Silica_removal.pdf
URL
https://docta.ucm.es/bitstreams/41de7569-53b8-481c-8fed-38bdbefb0436/download
File
MD5
a35208a665b1c6c7ea238e100e29960b
39538
text/plain
Silica removal in industrial effluents with high silica content and low hardness_Latour_ESPR_2014.pdf.txt
URL
https://docta.ucm.es/bitstreams/225f4cc9-45ec-4424-a53a-470a6b0062f3/download
File
MD5
a35208a665b1c6c7ea238e100e29960b
39538
text/plain
Silica_removal.pdf.txt