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耐盐菌BF40产表面活性剂特性及其对石油污染盐渍化土壤的修复能力

Keywords: 石油污染,盐渍化土壤,生物表面活性剂,沙雷氏菌,生物修复

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Abstract:

为强化微生物修复石油污染盐渍化土壤并提供高效产表面活性剂菌种,研究了耐盐菌SerratiaBF40产生物表面活性剂的条件、动力学特征以及对石油污染盐渍化土壤的修复能力。结果表明:BF40产表面活性剂最适碳源为牛肉膏,最适氮源为氯化铵。在30~37℃,pH7.0~9.0范围内产表面活性剂的能力较强。BF40在对数生长期产生表面活性剂,产生方式与细胞生长相关联。在含2.0%NaCl的培养基中,BF40可将发酵液表面张力降低到32.0mN·m-1,EI24达到66.9%。在含盐量为0.22%和0.61%土壤中添加BF40,降解40d后,土壤总石油烃降解率达到50%以上,表明BF40在强化修复石油污染盐渍化土壤中具有很大的应用潜力。

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