Substrate inhibition of degradation of 2,4-dinitrophenol in activated sludge
Abstract:Substrate inhibition of 2,4-dinitrophenol (2,4-DNP) degradation was investigated in activated sludge previously adapted to mineralize low concentrations of DNP. Typically, the time required for 95% degradation of 10 mg/L DNP under aerobic conditions and with mixed liquor suspended solids (MLSS) of 600 to 1 000 mg/L was less than 4 hours without any lag. However, when the initial DNP concentration increased to 75 mg/L, lags and even complete inhibition of DNP degradation were observed. The length of the lag was found to increase proportionally with decreasing MLSS. When dilute activated sludge was incubated for extended periods (192 hours), degradation of 75 mg/L DNP did eventually occur after lag periods of 37 to 144 hours, depending on MLSS concentration. Assays for most probable number of DNP-degrading bacteria were made to ascertain the effect of high DNP concentrations on bacterial populations in the activated sludge.
Document Type: Research Article
Publication date: January 1, 1998
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