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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Biodecolorization of the Azo Dye Reactive Red 2 by a Halotolerant Enrichment Culture
The decolorization of the azo dye Reactive Red 2 (RR2) under anoxic conditions was investigated using a mesophilic (35°C) halotolerant enrichment culture capable of growth at 100 g/L sodium chloride (NaCl). Batch decolorization assays were conducted with the unacclimated halotolerant culture, and dye decolorization kinetics were determined as a function of the initial dye, biomass, carbon source, and an externally added oxidation–reduction mediator (anthraquinone‐2,6‐disulphonic acid) concentrations. The maximum biomass‐normalized RR2 decolorization rate by the halotolerant enrichment culture under batch, anoxic incubation conditions was 26.8 mg dye/mg VSS·d. Although RR2 decolorization was inhibited at RR2 concentrations equal to and higher than 300 mg/L, the halotolerant culture achieved a 156‐fold higher RR2 decolorization rate compared with a previously reported, biomass‐normalized RR2 decolorization rate by a mixed mesophilic (35°C) methanogenic culture in the absence of NaCl. Decolorization kinetics at inhibitory RR2 levels were described based on the Haldane model (Haldane, 1965). Five repetitive dyeing/decolorization cycles performed using the halotolerant culture and the same RR2 dyebath solution demonstrated the feasibility of biological renovation and reuse of commercial‐strength spent reactive azo dyebaths.
Biodecolorization of the Azo Dye Reactive Red 2 by a Halotolerant Enrichment Culture
The decolorization of the azo dye Reactive Red 2 (RR2) under anoxic conditions was investigated using a mesophilic (35°C) halotolerant enrichment culture capable of growth at 100 g/L sodium chloride (NaCl). Batch decolorization assays were conducted with the unacclimated halotolerant culture, and dye decolorization kinetics were determined as a function of the initial dye, biomass, carbon source, and an externally added oxidation–reduction mediator (anthraquinone‐2,6‐disulphonic acid) concentrations. The maximum biomass‐normalized RR2 decolorization rate by the halotolerant enrichment culture under batch, anoxic incubation conditions was 26.8 mg dye/mg VSS·d. Although RR2 decolorization was inhibited at RR2 concentrations equal to and higher than 300 mg/L, the halotolerant culture achieved a 156‐fold higher RR2 decolorization rate compared with a previously reported, biomass‐normalized RR2 decolorization rate by a mixed mesophilic (35°C) methanogenic culture in the absence of NaCl. Decolorization kinetics at inhibitory RR2 levels were described based on the Haldane model (Haldane, 1965). Five repetitive dyeing/decolorization cycles performed using the halotolerant culture and the same RR2 dyebath solution demonstrated the feasibility of biological renovation and reuse of commercial‐strength spent reactive azo dyebaths.
Biodecolorization of the Azo Dye Reactive Red 2 by a Halotolerant Enrichment Culture
Beydilli, M. Inan (Autor:in) / Pavlostathis, Spyros G. (Autor:in)
Water Environment Research ; 79 ; 2446-2456
01.11.2007
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Method for solidifying sand by utilizing halotolerant bacteria
| Europäisches Patentamt | 2015