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Title: Inhibition of p-cresol on aerobic biodegradation of carbazole, and sodium salicylate by Pseudomonas putida
Authors: Yu, Y.-G. 
Loh, K.-C. 
Keywords: Carbazole
Cell growth
Growth rate
Sodium salicylate
Issue Date: 2002
Citation: Yu, Y.-G., Loh, K.-C. (2002). Inhibition of p-cresol on aerobic biodegradation of carbazole, and sodium salicylate by Pseudomonas putida. Water Research 36 (7) : 1794-1802. ScholarBank@NUS Repository.
Abstract: A PAH- and phenol-degrading microorganism, Pseudomonas putida (ATCC 17484), was used to study the substrate interactions during cell growth on carbazole-containing mixtures with p-cresol and sodium salicylate. Both p-cresol and sodium salicylate could be utilised by the bacteria as the sole carbon and energy sources. When cells grew on the mixture of carbazole, p-cresol and sodium salicylate, strong substrate interactions were observed. Carbazole degradation started only after p-cresol was significantly or completely removed, and the removal of carbazole was incomplete when the initial p-cresol concentration was higher than 20mg/l. No carbazole was removed at all when the initial p-cresol concentration in the system was higher than 120mg/l. When cells grew on the ternary substrates, the specific growth rate was found to increase with p-cresol concentration up to 50mg/l (from 0.33 to 0.45h-1) but decreased monotonically with higher concentrations. At 120mg/l p-cresol, specific growth rate fell to 0.33h-1. The inhibitory effect of p-cresol was demonstrated where carbazole degradation was immediately halted when 50mg/l p-cresol was spiked to a system containing carbazole and sodium salicylate. Besides, the addition of p-cresol was also found to inhibit the degradation of sodium salicylate. With p-cresol, an increase in lag time was observed and the utilisation of sodium salicylate as carbon source was severely retarded. Copyright © 2002 Elsevier Science Ltd.
Source Title: Water Research
ISSN: 00431354
DOI: 10.1016/S0043-1354(01)00387-6
Appears in Collections:Staff Publications

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