Guo Jianbo, Zhou Jiti, Wang Dong, Tian Cunping, Wang Ping, Salah Uddin M, Yu Hui
School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116023, PR China.
Water Res. 2007 Jan;41(2):426-32. doi: 10.1016/j.watres.2006.10.022. Epub 2006 Nov 28.
The accelerating effect of dissolved redox mediators has been studied in details in the bio-decolorization processes, but there are little literatures about the non-dissolved redox mediators. Here we describe the accelerating effect of anthraquinone as a redox mediator in the bio-decolorization. Decolorization of azo dyes was carried out experimentally using the salt-tolerant bacteria under immobilized anthraquinone and high salt conditions. Anthraquinone as a redox mediator was able to increase the decolorization rate of azo dyes, and was immobilized by entrapment in calcium alginate (CA), Polyvinyl alcohol (PVA)-H(3)BO(3) and agar, respectively. The effects of various operating conditions such as anthraquinone bead number, dissolved oxygen, temperature and pH on microbial decolorization were investigated experimentally. The reusability of the anthraquinone immobilization beads was evaluated with repeated-batch decolorization experiments. After four repeated experiments, the decolorization rate of CA immobilized anthraquinone retained over 90% of their original value. The experiments explored a great improvement of the redox mediator application and the new bio-treatment concept.
溶解态氧化还原介质的加速作用在生物脱色过程中已得到详细研究，但关于非溶解态氧化还原介质的文献却很少。在此，我们描述了蒽醌作为氧化还原介质在生物脱色中的加速作用。使用耐盐细菌在固定化蒽醌和高盐条件下对偶氮染料进行脱色实验。蒽醌作为氧化还原介质能够提高偶氮染料的脱色率，并分别通过包埋在海藻酸钙（CA）、聚乙烯醇（PVA）-H₃BO₃和琼脂中进行固定化。通过实验研究了各种操作条件，如蒽醌珠粒数量、溶解氧、温度和pH对微生物脱色的影响。通过重复批次脱色实验评估了蒽醌固定化珠粒的可重复使用性。经过四次重复实验后，CA固定化蒽醌的脱色率保持在其初始值的90%以上。这些实验探索了氧化还原介质应用的巨大改进以及新的生物处理概念。
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