| 两相分配生物反应器中苍白杆菌PW对芘的降解效果 |
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| 引用本文： | 李强,赵越,田雪,熊思,卢晓维,林爱军.两相分配生物反应器中苍白杆菌PW对芘的降解效果[J].环境科学研究,2015,28(12):1917-1922. |
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| 作者姓名： | 李强 赵越 田雪 熊思 卢晓维 林爱军 |
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| 作者单位： | 1.北京化工大学化学工程学院, 北京 100029 |
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| 基金项目： | 国家环境保护公益性行业科研专项(201309022) |
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| 摘 要： | 为降低PAHs对微生物的毒性,促进PAHs的降解,采用TPPB技术(two-phase patitioning bioreactor,两相分配生物反应器)对芘进行降解,研究了不同有机相(硅油、十二烷、十一醇、癸烷、十六烷、十八烷)、ρ(芘)、φ(有机相)和扰动速率对芘降解的影响. 结果表明:当φ(有机相)为10.0%、ρ(芘)为100~1 000 mg/L时,T0(纯水相)及T1(水-硅油)、T2(水-癸烷)、T3(水-十二烷)、T4(水-十一醇)、T5(水-十六烷)和T6(水-十八烷)体系中芘的降解率分别为92.5%~13.9%、69.3%~20.1%、79.6%~23.3%、81.9%~26.9%、86.7%~28.1%、87.7%~34.1%、89.6%~27.4%. ρ(芘)较低时,TPPB抑制了芘的降解；ρ(芘)较高时,TPPB则能促进芘的降解. 6种有机相中,十六烷对芘降解的促进效果最优. 最优φ(有机相)的确定和ρ(芘)有关,ρ(芘)为200 mg/L时,最优φ(十八烷)、φ(十六烷)、φ(十一醇)分别为5.0%、2.5%和5.0%；ρ(芘)为1 000 mg/L时,其均为20.0%. 液体扰动速率的提高能促进芘的降解,液体扰动速率为50~200 r/min时,T6和T5体系中的芘的降解率分别为50.1%~75.6%和54.1%~79.1%. 研究显示,TPPB技术是一种潜在治理高浓度PAHs污染的有效途径,TPPB的优化是多种影响因素综合作用的结果.
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| 关 键 词： | PW菌 芘 两相分配生物反应器 降解 扰动速率 |
| 收稿时间： | 2015/1/24 0:00:00 |
| 修稿时间： | 2015/8/20 0:00:00 |
Pyrene Degradation in Two-Phase Partitioning Bioreactor by Ochrobactrum sp. PW |
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| LI Qiang,ZHAO Yue,TIAN Xue,XIONG Si,LU Xiaowei and LIN Aijun.Pyrene Degradation in Two-Phase Partitioning Bioreactor by Ochrobactrum sp. PW[J].Research of Environmental Sciences,2015,28(12):1917-1922. |
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| Authors: | LI Qiang ZHAO Yue TIAN Xue XIONG Si LU Xiaowei and LIN Aijun |
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| Affiliation: | 1.College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China2.Chinese Academy for Environmental Planning, Beijing 100012, China |
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| Abstract: | The effects of different organic solvents, ρ(pyrene), φ(organic phase) and agitation rate were studied on pyrene degradation by Ochrobactrum sp. PW in TPPB, to reduce the toxicity of PAHs to microbes and to promote the degradation of PAHs. The results showed that when φ(organic phase) was 10.0% and ρ(pyrene) was 100-1000 mg/L, pyrene degradation rates in pure water, water-silicon oil, water-dodecane, water-undecanol, water-n-decane, water-hexadecane and water-octadecane were 92.5%-13.9%, 69.3%-20.1%, 79.6%-23.3%, 81.9%-26.9%, 86.7%-28.1%, 87.7%-34.1% and 89.6%-27.4%, respectively in eight days. This result showed that pyrene degradation was promoted at high ρ(pyrene) but inhibited at low ρ(pyrene) in TPPB. Among the six organic solvents studied, the highest degradation rate of pyrene was observed in hexadecane. The optimum proportions of φ(octadecane), φ(hexadecane) and φ(undecanol) were 5.0%, 2.5% and 5.0% when ρ(pyrene) was 100 mg/L; all were 20.0% when ρ(pyrene) was 1000 mg/L. This result showed that ρ(pyrene) has an effect on the optimum of φ(organic phase) in TPPB. A larger pyrene degradation rate was shown to result from an increase of the interfacial area and mass transfer rate with the increase of agitation rate. For example, the pyrene degradation rate was 50.1%-75.6% in water-octadecane, and was 54.1%-79.1% in water-hexadecane when the agitation rate was 50-200 r/min. The results indicated that TPPB is a potential way to treat pollution with the high concentration of PAHs effectively, and the optimization of TPPB technique was the result of various factors. |
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| Keywords: | Ochrobactrum sp PW pyrene two-phase partitioning bioreactor degradation agitation rate |
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