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Shortening of lag phase and enhancement of degradation rate are important goals concerning the treatment of xenobiotic compounds by activated sludge. In this study, activated sludge from a steady-state fed-batch reactor was used as-is (raw) and enriched with biogenic substrates in tests to determine sludge’s performance in acclimation and degradation of a model xenobiotic compound. Xenobiotic concentrations, growth of sludge, and sludge cells’ ATP along the courses of xenobiotic acclimation and degradation were measured. Test results show that the higher amount of energy initially contained in the enriched sludge was a factor that is instrumental to bring a shortening of acclimation lag time compared with that of raw sludge. Energy invested into activated sludge cells externally with easy substrates was found to improve activated sludge acclimation to a xenobiotic by sustaining the energy needs for the difficult metabolism of the xenobiotic.

Initial Energy Content of Cells Improve Efficiency of Activated Sludge Acclimation and Degradation of a Xenobiotic Compound