固定化铜绿假单胞菌GF31对氯氰菊酯降解的强化作用

doi:10.3969/j.issn.0438-1157.2013.06.042

化工学报 ›› 2013, Vol. 64 ›› Issue (6): 2219-2226.DOI: 10.3969/j.issn.0438-1157.2013.06.042

固定化铜绿假单胞菌GF31对氯氰菊酯降解的强化作用

李青云¹, 周茂钟¹, 刘幽燕^1,2, 唐爱星¹, 覃益民¹, 梁思婷¹, 韦滢军³

1. 广西大学化学化工学院,广西南宁530004;
2. 广西生物炼制重点实验室,广西南宁 530003;
3. 广西植保总站,广西南宁 530022

收稿日期:2012-10-15 修回日期:2013-03-05 出版日期:2013-06-05 发布日期:2013-06-05
通讯作者: 刘幽燕
作者简介:李青云(1978—),女,讲师。
基金资助:
国家自然科学基金项目(21066001);广西科学基金项目(桂科自0728047)。

Bioaugmentation strategy to enhance cypermethrin degradation by immobilized Pseudomonas aeruginosa GF31

LI Qingyun¹, ZHOU Maozhong¹, LIU Youyan^1,2, TANG Aixing¹, QIN Yimin¹, LIANG Siting¹, WEI Yingjun³

1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China;
2. Guangxi Key Laboratory of Biorefining, Nanning 530003, Guangxi, China;
3. Plant Protection Station of Guangxi, Nanning 530022, Guangxi, China

Received:2012-10-15 Revised:2013-03-05 Online:2013-06-05 Published:2013-06-05
Supported by:
supported by the National Natural Science Foundation of China(21066001).

摘要/Abstract

摘要： 研究了沸石固定化铜绿假单胞菌GF31的氯氰菊酯降解特性及强化修复效果。综合考虑氯氰菊酯特性及其传质等因素,选择沸石为载体进行固定化,电镜扫描结果显示,菌株GF31能较好地生长于沸石载体孔隙中。固定化后菌株GF31的去除率和比降解速率提高,6 d对100 mg·L^-1氯氰菊酯的去除率由37%提高至61.4%,游离细胞和固定化细胞对于300 mg·L^-1的氯氰菊酯的平均比降解速率分别为487和917 mg·[L·d·(g细胞干重)]^-1。固定化细胞对pH和高浓度氯氰菊酯的耐受性显著增强,在pH 10或者菊酯浓度为800 mg·L^-1时仍能保持一定的降解活力。投加固定化细胞对实际土壤进行生物强化修复,其降解过程可用一级动力学方程来描述。与自然降解相比,氯氰菊酯的半衰期t_1/2由34.3 d缩短至8.02 d,显示出固定化细胞良好的强化修复效果。

关键词: 氯氰菊酯, 固定化细胞, 生物降解, 铜绿假单胞菌, 强化作用

Abstract: The immobilization of Pseudomonas aeruginosa GF31 and its enhancement of biodegradation of cypermethrin were investigated.Zeolite was chosen as a suitable support for the immobilization by taking into account the properties of cypermethrin and mass transfer in the bioremediation.Scanning electron microscope (SEM) images demonstrated that strain GF31 grew well in the pore of the zeolite.After immobilization,cypermethrin removal efficiency was improved significantly from 37% to 61.4% at initial cypermethrin concentration of 100 mg ·L^-1 in 6 d.The specific degradation rate of free cells and immobilized cells were 487 and 917 mg·[L·d· (g dry biomass) ]^-1 respectively, at 300 mg·L^-1 cypermethrin.It was also found that the immobilized cells exhibited higher tolerance to pH and cypermethrin concentration, keeping its activities even at pH 10 or higher cypermethrin concentration up to 800 mg·L^-1.The results of actual soil remediation by the immobilized cells showed that cypermethrin degradation could be well described by a first-order reaction rate equation.As compared to natural degradation, cypermethrin half life (t_1/2) was shortened from 34.3 d to 8.02 d, which illustrated a good result of bioaugmented remediation by the immobilized Pseudomonas aeruginosa GF31.

Key words: cypermethrin, immobilized cell, biodegradation, Pseudomonas aeruginosa, bioaugmentation

中图分类号:

X53
X592

李青云, 周茂钟, 刘幽燕, 唐爱星, 覃益民, 梁思婷, 韦滢军. 固定化铜绿假单胞菌GF31对氯氰菊酯降解的强化作用[J]. 化工学报, 2013, 64(6): 2219-2226.

LI Qingyun, ZHOU Maozhong, LIU Youyan, TANG Aixing, QIN Yimin, LIANG Siting, WEI Yingjun. Bioaugmentation strategy to enhance cypermethrin degradation by immobilized Pseudomonas aeruginosa GF31[J]. CIESC Journal, 2013, 64(6): 2219-2226.

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固定化铜绿假单胞菌GF31对氯氰菊酯降解的强化作用

Bioaugmentation strategy to enhance cypermethrin degradation by immobilized Pseudomonas aeruginosa GF31

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