Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 63274
Title Reduction of the azo dye Mordant Orange 1 by methanogenic granular sludge exposed to oxygen
Author(s) Tan, N.C.G.; Lettinga, G.; Field, J.A.
Source Bioresource Technology 67 (1999). - ISSN 0960-8524 - p. 35 - 42.
Department(s) Sub-department of Environmental Technology
Publication type Refereed Article in a scientific journal
Publication year 1999
Abstract Integration of anaerobic and aerobic conditions in a single bioreactor is a good strategy for the complete mineralization of azo dyes. In order for this strategy to work, azo dye reduction should occur in biofilms exposed to oxygen. Therefore, the effect of oxygen on the azo dye reduction by methanogenic granular sludge was studied using Mordant Orange 1 (MO1) as a model. Azo dye-reduction rates by two different granular sludges were determined in batch assays with various concentrations of oxygen in the headspace. Azo dye reduction occurred in the presence of oxygen if co-substrates, either ethanol or acetate, were added. The rate of dye reduction was highly positively correlated with the oxygen-consuming activity of the sludge. The results suggest that co-substrates stimulate oxygen respiration, which lowers oxygen penetration into the biofilm and thereby creates anaerobic microniches where azo dye reduction can occur.
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