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Characterization and biological treatment of colored textile wastewaters from the typical Tunisian hat Chechia dyeing using newly isolated Aspergillus niger

Hajer Barouni, Haifa Chahed, Manel Ziadi, Kaouther Zaafouri, Mohamed Nejib Marzouki, Moktar Hamdi


This study aimed to characterize and investigate, for the first time, the treatment of real colored wastewaters from the artisanal dyeing of the typical Tunisian hat Chechia, using a newly isolated fungal strain. This textile effluent was a mixture called Mix of colored wastewaters from the three main types of Chechia. The major pollutant of the Mix was the toxic Azo dye Amaranth Acid or Acid Red 27. The fungal strain that made the cleanup was discovered in a Chechia dyeing wastewater’s container and identified by ITS rDNA gene sequencing. This isolated Aspergillus niger showed interesting performances on the demonstration of Chechia wastewater’s biodegradation in batch cultures. In order to understand the effect of agitation, Mix dilution and inoculum size on decolourisation and pollution removal, a full factorial experimental design 2 3 was set up. At the optimal conditions which were 20% inoculum size, 25% Chechia Mix dilution and an agitation of 100 rpm, Aspergillus niger was able to remove color as high as 70.18±2.84% at an initial dye concentration of 1346.6±0.01 mg/L, and to reduce COD to 74.17±14.52% at an initial COD of 4157±422 mg/L. FT-IR spectra analysis confirmed the decolourisation by biodegradation and transformation of the dyes. The treatment by the isolated Aspergillus niger could be successfully applied as a sustainable method to solve one of handicraft dyeing plants environmental management issues.

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