99107 20210215194931.0 doi 10.2166/wst.2016.227 sideral 96080 ART-2016-96080 eng (orcid)0000-0001-9050-236X Pueyo, N. Limitations of the removal of cyanide from coking wastewater by ozonation and by the hydrogen peroxideozone process 2016 Access copy available to the general public Unrestricted The purpose of this study is to compare the efficiency of ozonation and the hydrogen peroxide–ozone process for the removal of cyanide from coking wastewater. The most efficient oxidation process is combined with coagulation–flocculation–decantation and lime–soda ash softening pretreatments. The oxidation in aqueous solution and industrial wastewater (at pH 9.5–12.3) by O3 was carried out using a range of concentration of consumed O3 from 10 to 290 mg/L. A molar ratio of H2O2/O3 from 0.1 to 5.2 with different concentrations of O3 constants was used for the H2O2-O3 process. The maximum cyanide removal obtained in coking wastewater was 90% using a mass ratio of O3/CN– of 9.5. Using lower concentrations of O3, cyanide is not removed and can even be generated due to the presence of other cyanide precursor organic micropollutants in the industrial matrix. The concentration of O3 is reduced to half for the same cyanide removal efficiency if the pretreatments are applied to reduce the carbonate and bicarbonate ions. The cyanide removal efficiency in coking wastewater is not improved if the O3 is combined with the H2O2. However, the preliminary cyanide removal treatment in aqueous solution showed an increase in the cyanide removal efficiency for the H2O2-O3 process. info:eu-repo/grantAgreement/ES/DGA/T33 info:eu-repo/grantAgreement/ES/UZ/JIUZ-2014-TEC-11 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 1.197 2016 ENVIRONMENTAL SCIENCES 169 / 229 = 0.738 2016 Q3 T3 WATER RESOURCES 61 / 88 = 0.693 2016 Q3 T3 ENGINEERING, ENVIRONMENTAL 38 / 49 = 0.776 2016 Q4 T3 0.404 2016 Water Science and Technology 2016 Q2 Environmental Engineering 2016 Q3 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0002-1807-5049 Miguel, N. Universidad de Zaragoza (orcid)0000-0003-4382-4539 Ovelleiro, J. L. Universidad de Zaragoza (orcid)0000-0003-3014-0322 Ormad, M. P. Universidad de Zaragoza 5005 790 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Tecnologi. Medio Ambiente 74, 2 (2016), 482-490 Water sci. technol. WATER SCIENCE AND TECHNOLOGY 0273-1223 394755 http://zaguan.unizar.es/record/99107/files/texto_completo.pdf Versión publicada 2380397 http://zaguan.unizar.es/record/99107/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:99107 articulos driver 2021-02-15-17:21:36 ARTICLE