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Media type:
E-Article
Title:
Behavior of Benzidine and Other Aromatic Amines in Aerobic Wastewater Treatment
Contributor:
Baird, Rodger;
Carmona, Luis;
Jenkins, Richard L.
imprint:
Water Pollution Control Federation, 1977
Published in:Journal (Water Pollution Control Federation)
Language:
English
ISSN:
0043-1303
Origination:
Footnote:
Description:
<p>The degradation of benzidine and other aromatic amines by activated sludge under controlled conditions was monitored by gas-liquid chromatography techniques; toxicity was established using Warburg respirometry. Mass spectral analysis demonstrated that metabolites implicated as carcinogenic precursors did not survive activated sludge oxidation of benzidine, even though all the amines were toxic to microorganisms. These compounds were not refractory, but were significantly depleted biologically, suggesting the role of toxic intermediates. The reactivity of the methylanilines suggests that an ortho- or para-position on the aromatic as well as the <tex-math>$-{\rm NH}_{2}$</tex-math> group must be unsubstituted in order for biological attack to occur. An implication of the results is that trace analysis for carcinogenic amines in activated sludge systems is pointless, and that the search for potentially harmful metabolites would be more meaningful from a health standpoint.</p>