| Autor: |
Asri, Meryem, Ouafi, Redouane, Elabed, Soumya, Bahafid, Wifak, Koraichi, Saad Ibnsouda, Tavares, Teresa, El Ghachtouli, Naïma |
| Zdroj: |
Desalination & Water Treatment; September 2023, Vol. 306 Issue: 1 p39-50, 12p |
| Abstrakt: |
Chromium is one of the most common environmental pollutants due to its numerous industrial applications. In this work, Wickerhamomyces anomalusbiofilm attached to two different supports (wood husk and zeolite 13X) was tested to remove chromium from aqueous solutions and a tannery effluent. Fourier-transform infrared spectroscopy analysis allowed the identification of their chemical composition. The theoretical prediction of microbial adhesion showed a favorable attachment of Wickerhamomyces anomalusto wood husk and an unfavorable one to zeolite 13X. The predictions were confirmed by environmental scanning electron microscopy. The comparative study of chromium removal using both biofilms showed that the optimal contact time to reach maximal chromium removal was 36 h and 40 h for W. anomalusbiofilm supported on wood husk and zeolite 13X, respectively. For both supports, the chromium removal efficiency decreased with the increase of the metal initial concentration. The lowest flow rate (5 mL·min–1) and a support bed of 15 cm allowed the highest biosorption efficiency. The developed systems were therefore used for the treatment of a tannery effluent with an initial Cr(VI) and total Cr concentration of 7.23 and 42.56 mg·L–1, respectively. The highest depollution performance was obtained by the consortium W. anomalus– Bacillussp. attached to the wood husk. In a batch system, it allowed the removal of 97.52% of Cr(VI) and 98.12% of tot Cr initially contained in the tannery effluent after 48 h of treatment. In an open system, the removal of 90.34% of Cr(VI) and 95.33% of tot Cr was achieved after 50 h. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
