1Methanol is not broken down when added transiently (0.23 v/v) to a model activated sludge system operating with a retention time of 11 h. Measurement of methanol in the effluent agreed closely with calculated values.2Adaptation of the sludge in such a system to 0.1 (v/v) methanol occurs over a period of several days. More than 80 of the methanol is then metabolized.
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