The anaerobic degradation ofp-cresol under denitrifying conditions by a bacterial consortium was studied in batch and continuous cultures. Concentrations up to 3 mmwere degraded within 5–6 days with 4-hydroxybenzyl alcohol, 4-hydroxybenzaldehyde and 4-hydroxybenzoate as intermediates. Steady states could be maintained at only one dilution rate, D=0.04 h−1. A further increase in the dilution rate to 0.0 8 h−1resulted in culture wash-out. An estimation of the Saturation constant was made (<1 mg/l), taking the maximum specific growth rate as 0.045 h−1, thus yielding a value of 0.125 mgp-c
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