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Microbial degradation of phenol by activated sludge in a batch reactor

Duan Z.

Environment Protection Engineering

2011

Vol. 37, nr 2

53-63

Biodegradation of phenol in a batch reactor was investigated using activated sludge. The sludge was able to degrade phenol of initial concentrations up to 1.500 mg/dm 3. The optimum temperature and pH for the reaction were determined in extensive tests. The optimum pH was around 6, whereas the temperature showed no significant impact on the biodegradation rates over the investigated conditions. This activated sludge degraded phenol at the maximum rate of 0.048 g phenol/(g VSSźh) at pH 6 and 30 °C, whereas inhibitory effects existed at concentrations higher than 100 mg/dm 3. The Haldane kinetic model was used to elucidate the kinetics of phenol degradation in an activated sludge. The kinetic parameters were estimated to be q max = 0.4695 g phenol/(g VSSźh), K 1 = 28.4860 mg/dm 3, and K s = 603.9869 mg/dm 3, with the correlation coefficient (R 2) of 0.9599. The high q max value for phenol biodegradation shows that the activated sludge exhibited high resistance to phenol.