Combined biological and chemical treatment of highly concentrated residual dyehouse liquors
Combined biological and chemical treatment of highly concentrated residual dyehouse liquors
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DOI：
10.2166/wst.1998.0660
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发表时间：
1998-01-01
影响因子：
2.7
通讯作者：
Hempel, DC
中科院分区：
文献类型：
--
作者：
Krull, R;Hemmi, M;Hempel, DC
采用序批式反应器(SBR)对高浓度含难降解化合物的活性偶氮染料印染废液进行了生化联合处理研究。该厂由一个间歇反应器组成，在该反应器中，缺氧和好氧阶段按顺序进行。利用兼性厌氧细菌混合菌种在缺氧条件下对水溶性活性染料进行还原裂解脱色。在不添加外加助剂底物的情况下，可观察到近20g染料/L的完全脱色。在好氧条件下，相同的细菌混合培养在相同的反应器中进行切割产物的矿化。用于缺氧处理的生物质是在这个好氧阶段通过使用分流和容易生物降解的化合物来生长的。由于一些残留物质的顽固性毒性，臭氧部分氧化引发了进一步的好氧矿化。在循环流中进行部分臭氧氧化，并对转化后的物质进行生物后处理，可以提高反应选择性，实现更好的生物降解，尤其是降低臭氧的消耗。由于采用了高浓度印染厂废液的净化工艺，对DOC的总脱色和总降解率达到近90%。(C)1998由爱思唯尔科学有限公司出版。版权所有。
The combined biological and chemical treatment of highly concentrated reactive azo dye-containing residual dyehouse liquors with recalcitrant compounds was investigated in a sequencing batch reactor (SBR). The plant consists of a batch reactor in which the anoxic and aerobic phases are carried out by sequenced steps. Water-soluble reactive dyes were reductively cleft and decolorized by a facultative anaerobic bacterial mixed culture under anoxic conditions. Complete decolorization was observed up to concentrations of nearly 20 g dye/L without addition of an external auxiliar substrate. Mineralization of the cleavage products occurs with the same bacterial mixed culture in the same reactor under aerobic conditions. The biomass used for the anoxic treatment is grown in this aerobic phase by the use of split flows with readily biodegradable compounds. Because of the recalcitrant toxic character of some remaining substances, further aerobic mineralization was initiated by partial oxidation with ozone. Partial ozonization in a circulated stream with biological post-treatment of the transformed substances led to an increased reaction selectivity, to a better biological degradation and not least to a lower consumption of ozone. Due to this purification procedure involving highly concentrated residual dyehouse liquors a total decolorization and an overvall degradation of nearly 90% in DOC was achieved. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.