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Influence of some non‐halogenated aromatics on 2,4‐D assimilation by a microbial consortium

A microbial consortium capable of converting 2,4‐D with a maximum rate of 0.18 h−1 under chemostatic conditions was shown to be unable to further utilize this compound after nonchlorinated aromatics were simultaneously supplied. After a long term cultivation on aniline and 2,4‐D under chemostatic conditions, 2,4‐D remained almost unmetabolized and the culture could not be reactivated to use 2,4‐D as a sole source of carbon and energy. However, phenol pulses did not disturb growth on 2,4‐D when the latter was supplied in a carbon substrate‐limited manner at a rate lower than that used in the precultivation phase. Phenol even remained unmetabolized after one day of treatment. Wash‐in of phenol to a culture growing on an excess of 2,4‐D did not lead to a disturbance of growth either, but to a sequential consumption of both. These results are discussed in terms of metabolic incompatibility in the conversion of chlorinated and non‐chlorinated aromatics and regulatory threshold concentrations.