TY - JOUR
T1 - Anaerobic-aerobic treatment of halogenated phenolic compounds
AU - Armenante, Piero M.
AU - Kafkewitz, David
AU - Lewandowski, Gordon A.
AU - Jou, Chih Ju
N1 - Funding Information:
This work was supported by the Hazardous Substance Management Research Center at New Jersey Institute for Technology, which is a National Science Foundation Industry/University Cooperative Research Center, and an Advanced Technical Center of the New Jersey Commission on Science and Technology.
PY - 1999/2
Y1 - 1999/2
N2 - 2,4,6-trichlorophenol (2,4,6-TCP) was successfully and completely degraded in a two-stage anaerobic-aerobic biological process in which the initial step was conducted anaerobically, resulting in the reductive dechlorination of the target compound to 2,4-dichlorophenol (2,4-DCP), and then 4-chlorophenol (4-CP). Stoichiometric conversion of 2,4,6-TCP to 4-CP was achieved. The latter compound was then attacked and completely degraded aerobically in a second stage. The effects of parameters such as temperature and pH were determined for individual components of the process. The process was studied in serum bottles and shake flasks, and in anaerobic and aerobic bioreactors operating in both batch and continuous modes. A sequential anaerobic-aerobic bioreactor system was assembled, in which complete 2,4,6-TCP degradation was achieved. A mathematical model was developed to describe both anaerobic and aerobic processes, and the complete system. The model assumed that 2,4,6-TCP and 2,4-TCP could be anaerobically attacked according to a sequential irreversible reductive dechlorination reaction scheme based on Michaelis-Menten kinetics. A similar model was used to quantify aerobic degradation. The kinetic parameters for each step were obtained in independent batch experiments with suspended cultures, and were internally consistent. The model was able to predict the experimental results, which lends validity to the postulated kinetics mechanism.
AB - 2,4,6-trichlorophenol (2,4,6-TCP) was successfully and completely degraded in a two-stage anaerobic-aerobic biological process in which the initial step was conducted anaerobically, resulting in the reductive dechlorination of the target compound to 2,4-dichlorophenol (2,4-DCP), and then 4-chlorophenol (4-CP). Stoichiometric conversion of 2,4,6-TCP to 4-CP was achieved. The latter compound was then attacked and completely degraded aerobically in a second stage. The effects of parameters such as temperature and pH were determined for individual components of the process. The process was studied in serum bottles and shake flasks, and in anaerobic and aerobic bioreactors operating in both batch and continuous modes. A sequential anaerobic-aerobic bioreactor system was assembled, in which complete 2,4,6-TCP degradation was achieved. A mathematical model was developed to describe both anaerobic and aerobic processes, and the complete system. The model assumed that 2,4,6-TCP and 2,4-TCP could be anaerobically attacked according to a sequential irreversible reductive dechlorination reaction scheme based on Michaelis-Menten kinetics. A similar model was used to quantify aerobic degradation. The kinetic parameters for each step were obtained in independent batch experiments with suspended cultures, and were internally consistent. The model was able to predict the experimental results, which lends validity to the postulated kinetics mechanism.
KW - Aerobic treatment
KW - Anaerobic treatment
KW - Anaerobic-aerobic treatment
KW - Bioreactor
KW - Chlorophenol
KW - Dichlorophenol
KW - Kinetic modelling
KW - Michaelis-Menten parameters
KW - Reactor
KW - Trichlorophenol
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U2 - 10.1016/S0043-1354(98)00255-3
DO - 10.1016/S0043-1354(98)00255-3
M3 - Article
AN - SCOPUS:0033081790
SN - 0043-1354
VL - 33
SP - 681
EP - 692
JO - Water Research
JF - Water Research
IS - 3
ER -