Sequencing batch reactor technology for the purification of concentrated dyehouse liquors

Authors

  • Martin Hemmi,

    1. Institute of Biochemical Engineering, Technical University of Braunschweig, Gaussstrasse 17, 38106 Braunschweig, Germany
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  • Rainer Krull,

    1. Institute of Biochemical Engineering, Technical University of Braunschweig, Gaussstrasse 17, 38106 Braunschweig, Germany
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  • Dietmar C. Hempel

    Corresponding author
    1. Institute of Biochemical Engineering, Technical University of Braunschweig, Gaussstrasse 17, 38106 Braunschweig, Germany
    • Institute of Biochemical Engineering, Technical University of Braunschweig, Gaussstrasse 17, 38106 Braunschweig, Germany
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Abstract

A sequencing batch reactor (SBR) technology for the purification of concentrated reactive azo-dye containing residual dyehouse liquors from a padding process was developed and investigated. Within the treatment cycle, the anoxic dye cleavage, the aerobic mineralization of organic compounds, in combination with the biodegradability-achieving partial oxidation with ozone, are carried out sequentially. Anoxic decolourization of the residual liquor without addition of an auxiliary substrate was observed, and a 90% biological degradation of the dyehouse liquor's recalcitrant organic compounds was achieved. COD decreased by 95% and AOX (adsorbable organohalogenic compounds) by 90%. Within the whole process, the colour of the concentrated wastewater decreased by 98%.

Abstract

On a mis au point et ètudiè une technologie de rèacteurs discontinus sèquences (SBR) pour la purification d'azo-teinture rèactive concentrèe contenant des liqueurs de colorants rèsiduelles d'un procèdè de rembourrage. Lors du cycle de traitement, le clivage de la teinture anoxique et la minèralisation aèrobique des composès organiques en combinaison avec l'oxydation partielle à l'ozone qui permettent la biodègradabilitè, sont rèalisèes de manieáre sèquentielle. La dècoloration anoxique de la liqueur rèsiduelle sans ajout d'un substrat auxiliaire a ètè observèe et une dègradation biologique de 90% des composès organiques rècalcitrants des liqueurs de colorants a ètè rèalisèe. La DCO diminue de 95% et les AOX (composès organohalogeánes adsorbables) de 90%. Dans tout le procèdè, la couleur de l'eau usèe concentrèe règresse de 98%.

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