COMBINED TREATMENT USING OZONE FOR CYANIDE REMOVAL FROM WASTEWATER: A COMPARISON
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| Format: | Artículo científico |
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Universidad Nacional Autónoma de México
2019
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| _version_ | 1876440520840970240 |
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| author | Jefferson Morillo Esparza |
| author_facet | Jefferson Morillo Esparza |
| contents | COMBINED TREATMENT USING OZONE FOR CYANIDE REMOVAL FROM WASTEWATER: A COMPARISON Jefferson Morillo Esparza Nicolás Cevallos Cueva Christian Sandoval Pauker Paul Vargas Jentzsch Florinella Muñoz Bisesti Ciencias de la Tierra Ozonation cyanidation peroxone process activated carbon hydrogen peroxide Cyanidation is widely used by several gold mining companies worldwide. Since its wastewaters contain cyanide, appropriate treatments must be applied to remove this pollutant. Combinations of ozone (O3), hydrogen peroxide (H2O2) and activated carbon (AC) can be used for this purpose. In this work, synthetic cyanide solutions (CN¯o = 15.37 mM) were treated using O3 and the combinations O3/H2O2, O3/AC and O3/H2O2/AC under alkaline conditions. O3 was produced from dry oxygen at a rate of 2.51 g O3/h (O3 gas-phase = 6.9x10–2 g/L). The concentration of cyanide (CN¯) and O3 consumption were measured and the performance of the treatments evaluated. The highest cyanide removal was reached at pH 11.0 for all cases and with 10 mg H2O2/mg O3 upon adding H2O2. In contrast, the addition of AC did not improve the cyanide removal in comparison with O3 alone. The best cyanide removal was achieved with the combination O3/H2O2 followed by the combination O3/H2O2/AC. Moreover, cyanidation effluents were treated using the combination O3/H2O2. In this case, almost a total removal of free cyanide was achieved after 3 min of treatment. 2019 artículo científico 0188-4999 https://www.redalyc.org/articulo.oa?id=37062293025 https://www.redalyc.org/journal/370/37062293025/ https://www.redalyc.org/journal/370/37062293025/html/ https://www.redalyc.org/journal/370/37062293025/37062293025.epub https://www.redalyc.org/journal/370/37062293025/movil https://doi.org/10.20937/RICA.2019.35.02.16 en http://www.redalyc.org/revista.oa?id=370 Revista Internacional de Contaminación Ambiental application/pdf Universidad Nacional Autónoma de México Revista Internacional de Contaminación Ambiental (México) Num.2 Vol.35 |
| format | Artículo científico |
| id | redalyc_37062293025 |
| institution | Redalyc |
| language | en |
| publishDate | 2019 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | COMBINED TREATMENT USING OZONE FOR CYANIDE REMOVAL FROM WASTEWATER: A COMPARISON Jefferson Morillo Esparza Ciencias de la Tierra Ozonation cyanidation peroxone process activated carbon hydrogen peroxide COMBINED TREATMENT USING OZONE FOR CYANIDE REMOVAL FROM WASTEWATER: A COMPARISON Jefferson Morillo Esparza Nicolás Cevallos Cueva Christian Sandoval Pauker Paul Vargas Jentzsch Florinella Muñoz Bisesti Ciencias de la Tierra Ozonation cyanidation peroxone process activated carbon hydrogen peroxide Cyanidation is widely used by several gold mining companies worldwide. Since its wastewaters contain cyanide, appropriate treatments must be applied to remove this pollutant. Combinations of ozone (O3), hydrogen peroxide (H2O2) and activated carbon (AC) can be used for this purpose. In this work, synthetic cyanide solutions (CN¯o = 15.37 mM) were treated using O3 and the combinations O3/H2O2, O3/AC and O3/H2O2/AC under alkaline conditions. O3 was produced from dry oxygen at a rate of 2.51 g O3/h (O3 gas-phase = 6.9x10–2 g/L). The concentration of cyanide (CN¯) and O3 consumption were measured and the performance of the treatments evaluated. The highest cyanide removal was reached at pH 11.0 for all cases and with 10 mg H2O2/mg O3 upon adding H2O2. In contrast, the addition of AC did not improve the cyanide removal in comparison with O3 alone. The best cyanide removal was achieved with the combination O3/H2O2 followed by the combination O3/H2O2/AC. Moreover, cyanidation effluents were treated using the combination O3/H2O2. In this case, almost a total removal of free cyanide was achieved after 3 min of treatment. 2019 artículo científico 0188-4999 https://www.redalyc.org/articulo.oa?id=37062293025 https://www.redalyc.org/journal/370/37062293025/ https://www.redalyc.org/journal/370/37062293025/html/ https://www.redalyc.org/journal/370/37062293025/37062293025.epub https://www.redalyc.org/journal/370/37062293025/movil https://doi.org/10.20937/RICA.2019.35.02.16 en http://www.redalyc.org/revista.oa?id=370 Revista Internacional de Contaminación Ambiental application/pdf Universidad Nacional Autónoma de México Revista Internacional de Contaminación Ambiental (México) Num.2 Vol.35 |
| title | COMBINED TREATMENT USING OZONE FOR CYANIDE REMOVAL FROM WASTEWATER: A COMPARISON |
| topic | Ciencias de la Tierra Ozonation cyanidation peroxone process activated carbon hydrogen peroxide |
| url | https://www.redalyc.org/articulo.oa?id=37062293025 https://www.redalyc.org/journal/370/37062293025/ https://www.redalyc.org/journal/370/37062293025/html/ https://www.redalyc.org/journal/370/37062293025/37062293025.epub https://www.redalyc.org/journal/370/37062293025/movil https://doi.org/10.20937/RICA.2019.35.02.16 |