Effects of co-substrate and biomass acclimation concentration on the bioregeneration of azo dye-loaded mono-amine modified silica

• Published in: Bioresource technology Vol. 143; pp. 584 - 591
• Main Authors: Al-Amrani, Waheeba A., Lim, P.E., Seng, C.E., Wan Ngah, W.S.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.09.2013; Elsevier
• Subjects: Acclimation; Acclimation concentration; Adsorbents; Adsorption; Amines - chemistry; Azo Compounds - chemistry; Azo dye; Azo dyes; Biological and medical sciences; Biomass; Bioregeneration; Co-substrate; Coloring Agents - chemistry; Dyes; Fundamental and applied biological sciences. Psychology; Modified silica; Silica gel; Silicon dioxide; Silicon Dioxide - chemistry; Substrate Specificity; Sucrose; Acclimation concentration; Bioregeneration; Azo dye; Modified silica; Co-substrate; Substrate; Amine; Biomass; Silica; Inorganic compound; Adaptation
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2013.06.055

[Display omitted] •Bioregeneration of AO7-loaded MAMS in the absence of co-substrate.•Bioregeneration of AY9- and AR14-loaded MAMS in the presence of co-substrate.•Shortening of bioregeneration duration using higher acclimation concentration.•No effect on bioregeneration efficiency under different acclimation concentrations. Bioregeneration of mono-amine modified silica gel (MAMS) adsorbent loaded with Acid Orange 7 (AO7), Acid Yellow 9 (AY9) and Acid Red 14 (AR14), respectively, was investigated under two different operational conditions, namely absence/presence of sucrose/bacto-peptone as the co-substrate and different biomass acclimation concentrations. The results revealed that the AY9- and AR14-loaded MAMS adsorbents could almost be completely bioregenerated but only in the presence of co-substrate whereas the bioregeneration of AO7-loaded MAMS could achieve up to 71% in the absence of the co-substrate. These differences could be related to the structural properties of the investigated azo dyes. In addition, the results showed that the bioregeneration duration of AO7-loaded MAMS could be progressively shortened by using biomass acclimated to increasingly higher AO7 concentration. However, the bioregeneration efficiencies were found to be relatively unchanged under different biomass acclimation concentrations.