NOx removal in chemical absorption-biological reduction integrated system: process rate and rate-limiting step.
NOx removal in chemical absorption-biological reduction integrated system: process rate and rate-limiting step.
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DOI：
10.1016/j.biortech.2013.09.056
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发表时间：
2013-12
影响因子：
11.4
通讯作者：
Yin Xia;Bi-hong Lu;Nan Liu;Qiaoli Chen;Sujing Li;Wei Li
中科院分区：
文献类型：
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作者：
Yin Xia;Bi-hong Lu;Nan Liu;Qiaoli Chen;Sujing Li;Wei Li
Fe (III) EDTA的生物还原被认为是限制化学吸收-生物还原一体化系统去除效率的关键步骤。本研究测定了典型条件（T= 50℃，C FeII (EDTA)= 1-5 mmol/L, C NO= 0-500 ppm, co2 = 1-10%, pH= 7）下各反应步骤的反应速率。得到了吸附部分的速率常数和再生部分的Michaelis-Menten动力学常数。在此基础上，对稳态下各反应步骤的理论反应速率进行了预测和比较。结果证实，该体系对NO的去除率受到Fe (III) EDTA生物还原的限制。此外，适当提高总铁浓度可以促进Fe (III) EDTA的生物还原。
Biological reduction of Fe (III) EDTA is considered as the key step that limits the removal efficiency of the chemical absorption–biological reduction integrated system. In this study, the process rates of each reaction step under typical conditions (T= 50° C, C FeII (EDTA)= 1–5 mmol/L, C NO= 0–500 ppm, C O 2= 1–10%, pH= 7) were determined. Relevant kinetic constants including rate constants of absorption part and Michaelis–Menten kinetic constants of regeneration part were also obtained. On this basis, the theoretical process rates of each reaction step were predicted and compared in a steady state. The results confirmed that the removal rate of NO in this system is limited by the biological reduction of Fe (III) EDTA. Moreover, it indicated that increasing the concentration of total iron appropriately could enhance the bioreduction of Fe (III) EDTA.