Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 401122, People's Republic of China,
Environ Sci Pollut Res Int. 2014 Apr;21(8):5713-23. doi: 10.1007/s11356-014-2502-y. Epub 2014 Jan 17.
Certain aromatic amines generated by the decolorization of some azo dyes are not removed substantially by conventional anaerobic-aerobic biotreatment. These aromatic amines are potentially toxic and often released in the wastewater of industrial plants. In this study, the fate and transformation of the naphthylaminesulfonic azo dye Reactive Black 5 (RB5) during different phases of a sequencing batch reactor were investigated. The major products of RB5 decolorization during the anaerobic phase include 2-[(4-aminophenyl)sulfonyl]ethyl hydrogen sulfate (APSEHS) and 1-2-7-triamino-8-hydroxy-3-6-naphthalinedisulfate (TAHNDS). During the aerobic phase, APSEHS was hydrolyzed and produced 4-aminobenzenesulfonic acid, which was further degraded via dearomatization. TAHNDS was transformed rapidly via auto-oxidation into TAHNDSDP-1 and TAHNDSDP-2, which were not further removed by the activated sludge during the entire 30-day aerobic phase. In contrast, different behaviors of TAHNDS were observed during the anoxic phase. The transformation of TAHNDS was initiated either by deamination or desulfonation reaction. TAHNDS was then converted into 3,5-diamino-4-hydroxynaphthalene-2-sulfonic acid, which was subsequently removed via ring cleavage reaction under aerobic condition. In conclusion, complete degradation of TAHNDS by activated sludge occurs only during anoxic/aerobic processes instead of the conventional anaerobic/aerobic processes.
某些偶氮染料在脱色过程中产生的芳香胺在传统的厌氧-好氧生物处理中不能被大量去除。这些芳香胺具有潜在的毒性，并且经常在工业工厂的废水中释放。在这项研究中，研究了顺序批式反应器不同阶段萘基胺磺酸偶氮染料活性黑 5（RB5）的归宿和转化。在厌氧阶段，RB5 脱色的主要产物包括 2-[(4-氨基苯基)磺酰基]乙基硫酸氢盐（APSEHS）和 1-2-7-三氨基-8-羟基-3-6-萘二磺酸（TAHNDS）。在好氧阶段，APSEHS 发生水解生成 4-氨基苯磺酸，进一步通过脱芳构化降解。TAHNDS 迅速通过自动氧化转化为 TAHNDSDP-1 和 TAHNDSDP-2，在整个 30 天的好氧阶段，它们没有被活性污泥进一步去除。相比之下，在缺氧阶段观察到 TAHNDS 的不同行为。TAHNDS 的转化是通过脱氨或脱硫反应引发的。然后，TAHNDS 转化为 3,5-二氨基-4-羟基萘-2-磺酸，随后在有氧条件下通过环裂解反应去除。总之，只有在缺氧/好氧过程中，而不是传统的厌氧/好氧过程中，活性污泥才能完全降解 TAHNDS。
