Anaerobic treatment of azo dye Acid Orange 7 under fed-batch and continuous conditions.
Anaerobic treatment of azo dye Acid Orange 7 under fed-batch and continuous conditions.
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DOI：
10.1016/j.watres.2004.11.022
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发表时间：
2005-03
期刊：
影响因子：
12.8
通讯作者：
D. Méndez-Paz;F. Omil;Juan M. Lema
中科院分区：
文献类型：
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作者：
D. Méndez-Paz;F. Omil;Juan M. Lema
对酸性橙7(AO7)在补料分批和连续条件下进行厌氧处理。有无共底物的补料分批试验表明，当添加葡萄糖作为共底物时，该染料的去除效果很好。此外，AO7还原分解后产生的一些中间体，如1-氨基-2-萘酚(1A2N)，似乎扮演着重要的氧化还原介体的角色，从而提高了染料的降解率。在第一次进料期间，在滞后阶段之后达到最大的AO7去除速率，而对于进一步的AO7进料，没有观察到这一阶段，这一事实证明了这一效果。这可以用介质中1-氨基-2-萘酚的存在来解释。在UASB反应器的连续处理过程中，在进水为AO7(0.58 mM)和葡萄糖(2gl−1)的条件下，AO7的负荷达到1.7mMd−1(590mgl−1)，AO7的去除效率达到92%。此外，当辅基浓度为0.3 mM，葡萄糖为0.25gl−1时，AO7的去除效果显著降低(78%)。
Acid Orange 7 (AO7) was treated anaerobically under fed-batch and continuous conditions. Fed-batch assays carried out with and without cosubstrate showed that the removal rate of this dye is highly favourable when glucose is added as cosubstrate. In addition, some intermediates generated after the reductive breakdown of AO7, such as 1-amino-2-naphthol (1A2N), seem to play a significant role as redox mediators, thus increasing the degradation rate of the dye. This effect is evidenced by the fact that, during the first feeding, the maximum AO7 removal rate was achieved after a lag phase, whereas for further AO7 feedings this phase was not observed. This can be explained by the presence of 1-amino-2-naphthol in the medium. During the continuous treatment with UASB reactors, AO7 loading rates of 1.7mMd−1(590mgl−1d−1) were achieved, with 92% AO7 removal efficiencies, operating with an influent comprised of AO7 (0.58mM) and glucose (2gl−1). In addition, when the cosubstrate was limiting (AO7 0.3mM and glucose 0.25gl−1), AO7 removal was significantly lower (78%).