Special traits of decomposition of azo dyes by anaerobic microbial communitiesстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Авторы:
Yemashova N.A. ,
Kotova I.B. ,
Netrusov A.I. ,
Kalyuzhnyi S.V.
Журнал:
Applied Biochemistry and Microbiology
Том:
45
Номер:
2
Год издания:
2009
Издательство:
Maik Nauka/Interperiodica Publishing
Местоположение издательства:
Russian Federation
Первая страница:
176
Последняя страница:
181
DOI:
10.1134/S0003683809020100
Аннотация:
We present the results of an investigation into the special traits of conversion of azo dyes Acid Orange 6, Acid Orange 7, Methyl Orange, and Methyl Red under anaerobic conditions in comparison to aerobic conditions. In the presence of oxygen, only Methyl Red underwent decomposition, while under oxygen-free conditions, all remaining substances were fully decolourised under the action of a methanogenous consortium of microorganisms. The products of reduction of the azo bond are determined in the case of each dye. Introduction of additional acceptors of electrons (sulfate and nitrate) had a negative influence on the discoloration of azo dyes. Addition of ethanol as an available organic cosubstrate accelerated decomposition of azo dyes both under methanogenous and sulfate- and nitrate-reducing conditions. There is no direct correlation between the rates of conversion of azo dyes under anaerobic conditions or their toxicity to acetoclastic methanogens. Changes in the morphological composition of the community decolouring an azo dye depended on the duration of its impact on microorganisms. The mechanism of the reduction of the azo bond under the action of substances acting as mediators is explained. These substances are products of the metabolism of the microbial community in anaerobic conditions. It is shown that the supposed mediators NADH and sulfide efficiently decolourise azo dyes in a cell-free system, while riboflavin significantly increased the rate of conversion of substrates in recurrent cycles of discoloration only in the presence of an anaerobic microbial consortium. © 2009 Pleiades Publishing, Ltd.
Добавил в систему:
Калюжный Сергей Владимирович