Supported photocatalysis as a pre-treatment prior to biological degradation for the removal of some dyes from aqueous solutions; Acid Red 183, Biebrich Scarlet, Methyl Red Sodium Salt, Orange II
Supported photocatalysis as a pre-treatment prior to biological degradation for the removal of some dyes from aqueous solutions; Acid Red 183, Biebrich Scarlet, Methyl Red Sodium Salt, Orange II
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DOI：
10.1002/jctb.2342
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发表时间：
2010-04
影响因子：
3.4
通讯作者：
D. Chebli;F. Fourcade;S. Brosillon;S. Nacef;A. Amrane
中科院分区：
文献类型：
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作者：
D. Chebli;F. Fourcade;S. Brosillon;S. Nacef;A. Amrane
背景技术背景：本研究的目的是评估耦合的生物处理去除偶氮染料的废水的可行性。由于这类污染物的生物降解性很低或完全不存在，生物过程似乎并不总是与染料去除有关。研究结果：在预处理过程中，化学需氧量（COD）的降低表明目标化合物的氧化，从而改变了化学结构;然后可以预期更好的生物降解性或更低的毒性。然而，伴随着溶解有机碳（DOC），矿化产率高的特点，减少导致几乎恒定的COD：DOC的比例，这是不利的生物降解性的增加。这通过发现生物需氧量（BOD 5）与COD的比率的低值得到证实，其保持在0.09-0.19的范围内，即在光催化反应后低于0.4。此外，毒性增加或保持在高水平的偶氮染料照射后3小时，并降低只有橙子II，从有毒（EC 50 = 53%）到中度毒性（EC 50 = 76%）。结论：一个综合的过程，涉及光催化和生物处理处理偶氮染料出现不适合的测试条件下，可能只被认为是橙子II中的四个染料测试。版权所有© 2010化学工业协会
BACKGROUND: The aim of this study was to assess the feasibility of coupling photocatalysis and a biological treatment for the removal of azo dyes from aqueous effluents. Biological processes do not always appear relevant for dyes removal, owing to the low or total absence of biodegradability of this class of pollutants. RESULTS: During photocatalysis pre-treatment, a decrease in the chemical oxygen demand (COD) indicated oxidation of the target compound and thus a change in the chemical structure; better biodegradability or less toxicity could then be expected. However, the concomitant decrease in dissolved organic carbon (DOC), characteristic of a high mineralization yield, led to nearly constant COD:DOC ratios, which was unfavorable for an increase in biodegradability. It was confirmed by the low values found for the ratios biological oxygen demand (BOD5) to COD, which remained in the range 0.09-0.19, namely below 0.4 after photocatalytic reaction. Moreover, toxicity increased or remained at a high level after irradiation of the azo dyes for 3 h, and decreased only for Orange II, from toxic (EC50 = 53%) to moderately toxic (EC50 = 76%). CONCLUSION: An integrated process involving photocataysis and biological treatment to treat azo dyes appeared unsuitable under the conditions tested and may only be considered for Orange II among the four dyes tested. Copyright © 2010 Society of Chemical Industry