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Use of ozone in a pilot-scale plant for textile wastewater pre-treatment: Physico-chemical efficiency, degradation by-products identification and environmental toxicity of treated wastewater

Somensi, Cleder A., Simionatto, Edésio L., Bertoli, Sávio L., Wisniewski, Alberto, Radetski, Claudemir M.·2010·Journal of Hazardous Materials
DOI 10.1016/j.jhazmat.2009.09.154
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Abstract

In this study, ozonation of raw textile wastewater was conducted in a pilot-scale plant and the efficiency of this treatment was evaluated based on the parameters color removal and soluble organic matter measured as chemical oxygen demand (COD), at two pH values (9.1 and 3.0). Identification of intermediate and final degradation products of ozone pre-treatment, as well as the evaluation of the final ecotoxicity (Lumistox test) of pre-treated wastewater, was also carried out. After 4h of ozone treatment with wastewater recirculation (flow rate of 0.45 m(3)h(-1)) the average efficiencies for color removal were 67.5% (pH 9.1) and 40.6% (pH 3.0), while COD reduction was 25.5% (pH 9.1) and 18.7% (pH 3.0) for an ozone production capacity of 20 g h(-1). Furthermore, ozonation enhances the biodegradability of textile wastewater (BOD(5)/COD ratios) by a factor of up to 6.8-fold. A GC-MS analysis of pre-treated textile wastewater showed that some products were present at the end of the pre-treatment time. In spite of this fact, the bacterial luminescence inhibition test (Lumistox test) showed a significant toxicity reduction on comparing the raw and treated textile wastewater. In conclusion, pre-ozonation of textile wastewater is an important step in terms of improving wastewater biodegradability, as well as reducing acute ecotoxicity, which should be removed completely through sequential biological treatment.

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Research works printed but not linked: 26

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Metadata

Authors
Somensi, C. A., Simionatto, E. L., Bertoli, S. L., Wisniewski, A., & Radetski, C. M.
Venue
Journal of Hazardous Materials
Publisher
Elsevier BV
Published
2010-03
Volume
175
Issue
1-3
Pages
235-240
ISSN
0304-3894
DOI
10.1016/j.jhazmat.2009.09.154
Cited by
128
References
0
Language
en
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)

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