Producción Científica Profesorado

A method for measuring the anoxic biodegradability under denitrifying conditions



Vázquez Rodríguez, Gabriela Alejandra

2008

Vázquez-Rodríguez G.A., Beltrán-Hernánez R.I., Lucho-Constantino C.A. and Blasco J.L. (2008) A method for measuring the anoxic biodegradability under denitrifying conditions. Chemosphere 71: 1363-1368. http://dx.doi.org/10.1016/j.chemosphere.2007.11.012


Abstract


A test for assessing the anoxic biodegradability of organic compounds under denitrifying conditions is proposed. The method is based on the recovery and quantification of the CO2 produced, which is evidence of complete biodegradation of the test compound (added as the sole carbon source). The tests were carried out in a mineral medium, with nitrate as electron acceptor. Whole lake sediments, sediment extracts and a commercial inoculum were assayed as a possible inoculum source by means of glucose biodegradability tests. It was found that the sediment extracts constitute a suitable and environmentally-relevant inoculum source, since they add non-significant amounts of carbon to the tests. Two xenobiotic compounds, namely, aniline and phenol, were tested in the aforementioned conditions as well as in a standard aerobic biodegradability test. Both aniline and phenol attained a biodegradation level higher than 60% in a short time period (<28 days) and thus can be considered as readily biodegradable in denitrifying environments. Nevertheless, the kinetics obtained in the anoxic test were slower than in aerobic conditions, and even suggested the accumulation of intermediate metabolites in the case of phenol. The results of this study indicate that the fate of xenobiotic compounds under anoxic conditions differs from that observed in an oxic environment, and therefore it should be considered by standard biodegradability testing procedures.



Producto de Investigación




Artículos relacionados

Effect of the inoculation level in aerobic biodegradability tests of polymeric materials

Mathematical modeling of diffusion regulated Quorum sensing in Artificially Structured Microbial Con...

DISEÑO DE UNA PLANTA DE TRATAMIENTO DE AGUAS RESIDUALES BASADO EN EL PRINCIPIO DE CONSORCIOS MICROBI...

Procedures in Ready Biodegradability Testing: Effects of the Inoculation and the Monitored Parameter

Standardization of activated sludge for biodegradation tests

Two-step modeling of the biodegradation of phenol by an acclimated activated sludge

ESTUDIO DEL PROCESO DE DESTILACIÓN REACTIVA EN LA HIDRODESULFURACIÓN DE GASÓLEO PARA PRODUCIR DIESEL...

Model-based design of different fedbatch strategies for phenol degradation in acclimatized activated...

MODELACIÓN MATEMÁTICA DE LA CINÉTICA DE CATALIZADORES PARA LA PRODUCCION DE DIESEL DE ULTRA BAJO AZU...

Inocula from activated sludge for ready biodegradability testing: Homogenization by preconditioning