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

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• 作者：Waheeba A. Al-Amrani ; P.E. Lim ; C.E. Seng ; W.S. Wan Ngah
• 关键词：Bioregeneration ; Modified silica ; Azo dye ; Co-substrate ; Acclimation concentration
• 刊名：Bioresource Technology
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：143
• 期：Complete
• 页码：584-591
• 全文大小：738 K

文摘

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.