Couplage des procédés membranaires aux techniques physico-chimiques ou biologiques pour le traitement des rejets liquides de l'industrie de textile

Abstract : The treatment of textile wastewater is usually done by a set of physicochemical processes coupled with a biological treatment. The effluent quality abides with difficulty the norms for reuse or discharge in environment. Various treatment combinations have been tested such as coagulation-flocculation (CF) and adsorption on activated carbon (PAC) coupled with membrane technologies (microfiltration (MF) or ultrafiltration (UF)), photocatalysis coupled with a biological treatment (membrane bioreactor (MBR) or a sequential batch reactor (SBR) or a biological and chemical anaerobic treatment. A general comparison was made to optimise the appropriate treatment. The combination CF-PAC-UF is the most effective of non-biological systems in terms of COD, absorbance and turbidity removal. The degradation of an azoïc and a phthalocyanine textile dyes by simple photocatalysis or combined to a membrane bioreactor has been investigated. Photocatalysis was achieved in a falling film reactor containing titanium dioxide fixed on cellulose fibres under UV irradiation. For both biological systems, although biomass was influenced by the variation of dyes concentration and the continuous operating mode for the MBR, it could resist to the applied conditions. However, even after pre-treatment where full decolouration was achieved, photocatalytic by-products were toxic and could inhibit COD removal. Chemical and biological anaerobic treatment have been applied to textile dyes and combined with a photocatalytic process. Photocatalysis was able to remove more than 90% color from crude as well as autoxidized reduced dye solutions. The photocatalytic end-products were not toxic toward methanogenic bacteria
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Farida Harrelkas. Couplage des procédés membranaires aux techniques physico-chimiques ou biologiques pour le traitement des rejets liquides de l'industrie de textile. Autre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL008N⟩. ⟨tel-01752986⟩

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