Biodegradation kinetics of 4-nitrophenol (4NP) was investigated in a lab-scale sequencing batch reactor fed with the compound as the sole carbon source. The experimental results showed that complete 4NP removal can be easily achieved with acclimatized biomass, even if an inhibition kinetics is observed; furthermore, an improvement in the removal kinetics is obtained if the substrate concentration peak, reached in the reactor at the end of the filling time, is maintained to quite a low value. Both long feed phase and high biomass concentration are effective in reducing the substrate concentration peak and then improving the process efficiency. Kinetic test data are well correlated by the Haldane equation, with a saturation constant K-s and an inhibition constant K-I, of 17.6 and 30.7 (mg l(-1) 4NP), respectively, whereas the maximum removal rate was in the range of 3.3-8.4 (mg 4NP mg VSS-1 d(-1)) depending on the substrate concentration peak reached in the reaction phase. (C) 2003 Elsevier Ltd. All rights reserved.
4-nitrophenol biodegradation in a sequencing batch reactor: kinetic study and effect of filling time / M., Concetta Tomei; Annesini, Maria Cristina; S., Bussoletti. - In: WATER RESEARCH. - ISSN 0043-1354. - 38:2(2004), pp. 375-384. [10.1016/j.watres.2003.09.023]
4-nitrophenol biodegradation in a sequencing batch reactor: kinetic study and effect of filling time
ANNESINI, Maria Cristina;
2004
Abstract
Biodegradation kinetics of 4-nitrophenol (4NP) was investigated in a lab-scale sequencing batch reactor fed with the compound as the sole carbon source. The experimental results showed that complete 4NP removal can be easily achieved with acclimatized biomass, even if an inhibition kinetics is observed; furthermore, an improvement in the removal kinetics is obtained if the substrate concentration peak, reached in the reactor at the end of the filling time, is maintained to quite a low value. Both long feed phase and high biomass concentration are effective in reducing the substrate concentration peak and then improving the process efficiency. Kinetic test data are well correlated by the Haldane equation, with a saturation constant K-s and an inhibition constant K-I, of 17.6 and 30.7 (mg l(-1) 4NP), respectively, whereas the maximum removal rate was in the range of 3.3-8.4 (mg 4NP mg VSS-1 d(-1)) depending on the substrate concentration peak reached in the reaction phase. (C) 2003 Elsevier Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
