Anaerobic-aerobic treatment of halogenated phenolic compounds
Anaerobic-aerobic treatment of halogenated phenolic compounds
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DOI：
10.1016/s0043-1354(98)00255-3
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发表时间：
1999-02-01
期刊：
影响因子：
12.8
通讯作者：
Jou, CJ
中科院分区：
文献类型：
--
作者：
Armenante, PM;Kafkewitz, D;Jou, CJ
2，4，6-三氯苯酚(2，4，6-TCP)在厌氧-好氧两级生物工艺中被成功地完全降解，目标化合物被还原脱氯为2，4-二氯酚(2，4-DCP)，然后是4-氯苯酚(4-CP)。实现了2，4，6-磷酸三钙到3-磷酸的化学计量转化。后一种化合物随后受到攻击，并在第二阶段完全有氧降解。确定了温度和pH等参数对过程中各个组分的影响。在血清瓶和摇瓶中以及在间歇和连续模式下运行的厌氧和好氧生物反应器中研究了这一过程。构建了厌氧好氧生物反应器系统，实现了2，4，6-磷酸三钙的完全降解。建立了描述厌氧和好氧过程以及整个系统的数学模型。该模型假定2，4，6-三氯苯酚和2，4-三氯苯酚可以按照基于Michaelis-Menten动力学的顺序不可逆还原脱氯反应方案进行厌氧攻击。A.采用类似的模型对好氧降解进行量化。每一步的动力学参数：在悬浮培养的独立批次实验中获得，且内部一致。该模型能够预测实验结果，从而验证了假设的动力学机理。(C)1998爱思唯尔科学有限公司。保留所有权利。
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 3-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 wen: 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. (C) 1998 Elsevier Science Ltd. All rights reserved.