Removal of coloured compounds from textile industry effluents by UV/H2O2 advanced oxidation and toxicity evaluation
2011
Nagel-Hassemer, Maria Eliza | Carvalho-Pinto, Catia Regina S. | Matias, William Gerson | Lapolli, Flávio Rubens
This study has investigated the reduction in coloured substances and toxic compounds present in textile industry effluent by the use of an advanced oxidation process using hydrogen peroxide (H₂O₂) as oxidant, activated by ultraviolet radiation. The investigation was carried out on industrial effluents, both raw and after biological treatment, using different concentrations of H₂O₂ in a photochemical reactor equipped with a 250 W high-pressure mercury vapour lamp. The results showed that after 60 minutes of ultraviolet irradiation a H₂O₂ concentration of 500 mg L⁻¹ was able to remove approximately 73% of the coloured compounds present in raw effluent and 96% of those present in biologically treated effluent. Additionally, post-treatment toxicity tests performed using the microcrustacean Daphnia magna showed a significant effective reduction in the acute toxicity of the raw effluent. In tests carried out with treatment at a concentration of 750 and 1000 mg L⁻¹ H₂O₂, analysis of the frequency of micronuclei in erythrocytes of Tilapia cf. rendalli exposed to treated effluent samples confirmed that there were no mutagenic effects on the fish. Together, these results indicate that the oxidation process offers a good alternative for the removal of colour and toxicity from textile industry effluent.
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