Novel study on biodegradation of malathion and investigation of mass transfer correlation using alginate beads immobilized Bacillus sp. S4 in bioreactor
Novel study on biodegradation of malathion and investigation of mass transfer correlation using alginate beads immobilized Bacillus sp. S4 in bioreactor
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DOI：
10.1016/j.jece.2018.05.025
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发表时间：
2018-04-01
影响因子：
7.7
通讯作者：
Rai, B. N.
中科院分区：
文献类型：
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作者：
Geed, S. R.;Kureel, M. K.;Rai, B. N.
本研究研究了外部传质对马拉硫磷生物降解的影响。实验在装有固定藻酸盐珠的连续填充床生物反应器中进行。分离的细菌种芽孢杆菌属 sp。 S4 用藻酸盐床封装。研究了入口流速（5-20 mL/h）对马拉硫磷（300 mg/L）生物降解的影响。在不同流速下，通过假设一级生物降解动力学来计算生物降解速率常数。提出了马拉硫磷生物降解可能的降解途径。还研究了不同流速值下马拉硫磷生物降解的外部传质系数。传质效应与模型J(D)=KNRe-(1-n)相关。为了准确预测实验数据，发现新的传质相关性为 J(D)= 5.7 N-Re(-0.40)，并在不同的 n 和 K 值下对模型进行了研究。所开发的模型将有助于工业生物反应器的放大。
In this study the external mass transfer effects on the biodegradation of malathion were studied. The experiments were performed in continuous packed bed bioreactor packed with immobilized alginate beads. The isolated bacterial species Bacillus sp. S4 was encapsulated with alginate beds. The effect of inlet flow rate (5-20 mL/h) on biodegradation of malathion (300 mg/L) was examined. At different flow rates the biodegradation rate constants were calculated by assuming the first-order biodegradation kinetics. The possible degradation routes were proposed for malathion biodegradation. The external mass transfer coefficients for biodegradation of malathion were also investigated for different values of flow rate. The mass transfer effect was correlated with the model J(D)= KNRe-(1-n). The novel mass transfer correlation was found as J(D)= 5.7 N-Re(-0.40) in order to predict the experimental data accurately and the model were studied with different values of n and K. The developed model would be useful for the scale up of useful industrial bioreactors.