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- Title
Toxic effect of H 2 O 2 in H 2 O 2 /UV, photo-Fenton and heterogeneous photocatalysis (TiO 2 /H 2 O 2 /UV) systems to treat textile wastewater.
- Authors
Lopez-Lopez, C.; Purswani, J.; Martín-Pascual, J.; Martínez-Toledo, M.V.; Muñío, M.M.; Poyatos, J.M.
- Abstract
The application of H2O2/UV, photo-Fenton and heterogeneous photocatalysis (TiO2/H2O2/UV) processes for the treatment of a highly polluted coloured wastewater was analysed. The experiments were carried out with different H2O2concentrations (0.25, 0.5, 1, 2 and 5 g/L). The toxic properties of different H2O2concentrations in textile wastewater were tested by the use of a Microtox bioassay withVibrio fischeri.The efficiency of the process was checked by assessing the physicochemical parameters, total organic carbon (TOC) and colour. The use of TiO2as a catalyst with UV photolysis was the most effective method to remove toxins, organic material and colour using the five concentrations of H2O2tested. By using 5 g/L of H2O2, 94% TOC removal was achieved. In relation to colour removal, this was greater than 99% with 5 g/L of H2O2in all three processes. The use of a catalyst allowed us to reduce the hydraulic retention time of the process to 30 min with Fe2+and 45 min with TiO2.Controlling the amount of H2O2used as the oxidant in an advanced oxidation process (AOP) is important since it was found to increase the toxicity of the influent with the addition of H2O2by 4.99 ± 1.48%, 27.4 ± 3.24%, 39.16 ± 5.64%, 53.40 ± 4.15% and 59.39 ± 4.67% with 0.25, 0.5, 1, 2 and 5 g/L H2O2, respectively. Therefore, under the studied conditions, an H2O2concentration greater than 1 g/L is not recommended for an AOP in order to avoid an excess of H2O2in the effluent.
- Subjects
HYDROGEN peroxide; PHOTOCATALYSIS; WASTEWATER treatment; TOXICITY testing; ULTRAVIOLET photolysis; TITANIUM dioxide; BIOLOGICAL assay
- Publication
Desalination & Water Treatment, 2015, Vol 56, Issue 11, p3044
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2014.965224