北京大学学报（自然科学版）

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不同碳源对苯并[a]芘降解菌生长和降解性能影响的研究

朱婷婷1,2,倪晋仁1,2   

  1. 1. 北京大学深圳研究生院环境与能源学院, 城市人居环境科学与技术重点实验室, 深圳 518055; 2. 北京大学环境工程系, 水沙科学教育部重点实验室, 北京 100871;
  • 收稿日期:2011-03-23 出版日期:2012-03-20 发布日期:2012-03-20

Effect of Different Kinds of Extra Carbon Sources on the Biomass Production and BaP Removal by Bacillus pumilus Strain Bap9

ZHU Tingting1,2, NI Jinren1,2   

  1. 1. Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055; 2. Department of Environmental Engineering, Peking University, Key Laboratory of water and Sediment Science MOE, Beijing 100871;
  • Received:2011-03-23 Online:2012-03-20 Published:2012-03-20

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摘要： 采用从受户外烧烤影响的土壤中分离出的苯并[a]芘降解菌Bacillus pumilus strain Bap9, 利用摇床实验研究了不同外加碳源对其生长和苯并[a]芘降解性能的影响。结果表明, 苯并[a]芘初始浓度为40 mg/L时, 蔗糖、葡萄糖、麦芽糖的存在会抑制菌株对苯并[a]芘的降解, 可溶性淀粉的影响不明显。以醋酸钠为外加碳源可明显促进菌株的降解作用, 添加40 mg/L的醋酸钠, 20天后可将菌株Bap9的降解率提高了8.8%, 但过量的碳源会抑制菌株对苯并[a]芘的降解。添加适量的低分子量菲(PAH)作为共代谢底物, 菲的促进作用大于同浓度的醋酸钠, 添加40 mg/L的菲, 20天后菌株对苯并[a]芘的降解率提高了26.4%。

关键词: 苯并[a]芘, 微生物降解, 碳源, 共代谢, Bacilluspumilus

Abstract: Batch experiments were conducted in order to investigate the effects of extra carbon sources on benzo[a]pyrene (BaP) biodegradation by Bacillus pumilus strain Bap9, which was isolated from polluted soil collected from open-air barbecue market. In the culture system under initial BaP concentration of 40 mg/L, the addition of sucrose, glucose, maltose reduced the degradation rates, the presence of soluble starch had no obvious effect on the biodegradation, while the supplement of sodium acetate increased by 8.8% of the degradation rates most effectively. However, if the concentrations were too high, sodium acetate would show the inhibition of biodegradation. The supplementation of phenanthrene (Phe), was more effective on increasing the degradation rate than sodium acetate of the same concentration. The biodegradation rate of BaP increased 26.4% after a 20 days incubation period , while Phe of 40 mg/L was used as the co-metabolism substrate.

Key words: Benzo[a]pyrene (BaP), biodegradation, carbon source, co-metabolism, Bacillus pumilu

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