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Article Dans Une Revue Desalination Année : 2011

Photocatalysis as a pre-treatment prior to a biological degradation of cyproconazole

Résumé

The feasibility of coupling photocatalysis and a biological treatment (Pseudomonas fluorescens) to remove a fungicide, cyproconazole, in pure water was examined. Photocatalytic elimination of 85 10 −3 g L −1 cyproconazole was almost complete after 500minutes irradiation. In view of a subsequent biological treatment, the residual organic content should be significant and hence 255minutes irradiation time was chosen, leading to 85.8% elimination yield, 38.5% mineralisation and 51.6% oxidation. COD on TOC ratio decreased during photocatalysis indicating a favourable trend, which however was not confirmed by a decrease of the toxicity, since the EC 50 values were 61% and 64% initially and after 255minutes irradiation. In addition, the presence of by-products from photocatalysis after P. fluorescens culture, showing their non-biodegradability, was also in disfavour of a coupling of the two operations. Therefore in the considered experimental conditions, photocatalysis prior to biological treatment with P. fluorescens is not really relevant to treat water containing cyproconazole.

Dates et versions

hal-00920402 , version 1 (18-12-2013)

Identifiants

Citer

Souhila Yahiat, Florence Fourcade, Stephan Brosillon, Abdeltif Amrane. Photocatalysis as a pre-treatment prior to a biological degradation of cyproconazole. Desalination, 2011, 281, pp.61-67. ⟨10.1016/j.desal.2011.07.012⟩. ⟨hal-00920402⟩
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