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Tetracycline degradation by ozonation, and evaluation of biodegradability and toxicity of ozonation byproducts

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Tetracycline was exposed to ozone by bubbling at different pH levels, and the acute toxicity of ozonation byproducts was tested by luminescent bacteria (Vibrio qinghaiensis sp.-Q67). Residual tetracycline in the solutions was detected by high performance liquid chromatography (HPLC). The results indicated that tetracycline was immediately degraded by ozonation and the degradation was favored at higher pH. Tetracycline (20 mg L-1) was completely degraded after 5 min of ozonation. However, total organic carbon (TOC) hardly decreased even though the ozonation time was extended to 40 min, suggesting that the ozonation process could not mineralize tetracycline. The luminescent bacteria assay indicated that the toxicity of the tetracycline solution was changed after ozonation. Chemical oxygen demand (COD) dropped by 15%, and the BOD5/COD ratio increased from 0.09 to 0.26, suggesting that the biodegradability of tetracycline was enhanced after 20 min of ozonation treatment.

De la tétracycline a été exposée à de l’ozone par barbottage à différents pH et la toxicité aigüe des sous-produits de l’ozonisation a été vérifiée par l’utilisation de bactéries luminescentes (Vibrio qinghaiensis sp-Q67). La tétracycline résiduelle dans les solutions a été détectée par CLHP. Les résultats montrent que la tétracycline était immédiatement dégradée par l’ozonisation et que la dégradation était favorisée à des pH élevés. La tétracycline (20 mg L-1) a été entièrement dégradée après 5 minutes d’ozonisation. Toutefois, le carbone organique total (COT) a à peine diminué, même lorsque le temps d’ozonisation a été prolongé à 40 minutes, ce qui donne à penser que le processus d’ozonisation ne pourrait pas minéraliser la tétracycline. La teneur en bactéries luminescentes indiquait que la toxicité de la solution de tétracycline avait changé après l’ozonisation. La DCO a chuté de 15 % et le rapport DBO5/DCO a augmenté de 0,09 à 0,26, ce qui laisse croire que la biodégradabilité de la tétracycline était rehaussée après 20 minutes du traitement par ozonisation.

Document Type: Research Article

Publication date: November 1, 2010

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  • Published since 1974, this monthly publication is the official journal of the Canadian Society for Civil Engineering. It contains articles on environmental engineering, hydrotechnical engineering, structure engineering, construction engineering, engineering mechanics, and engineering materials, and a history of civil engineering. Contributors include recognized researchers and practitioners in industry, government, and academe. New developments in engineering design and construction are also featured.
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