Unbound MEDLINE

Removal of coloured compounds from textile industry effluents by UV/H2O2 advanced oxidation and toxicity evaluation.

Abstract

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 ofmicronuclei 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.

Authors

Nagel-Hassemer ME, Carvalho-Pinto CR, Matias WG, Lapolli FR

Source

Environmental technology 33:15-16 2011 Dec pg 1867-74

MeSH

Animals
Daphnia
Hydrogen Peroxide
Industrial Waste
Mutagenicity Tests
Oxidation-Reduction
Textile Industry
Toxicity Tests, Acute
Ultraviolet Rays
Waste Disposal, Fluid

Pub Type(s)

Evaluation Studies
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22439575