| 土壤微生物对苯的降解研究 |
| 摘要点击 1771 全文点击 1751 投稿时间：2004-10-30 修订日期：2005-04-21 |
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| 中文关键词 土壤 石油污染物 微生物降解 苯 |
| 英文关键词 soil oil pollutants biodegradation benzene |
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| 中文摘要 |
| 使用大庆油田石油污染土壤中分离出优势菌种(革兰氏阴性G-、黄杆菌属Flavobacterium),在实验室可控条件下,研究了该菌种对苯的降解规律和特点.研究发现:微生物对苯浓度耐受范围8.8～17.6 mg·L-1,大于17.6mg·L-1时,对该菌株产生明显的抑制作用.降解体系在pH为6.5～7.0之间达到对苯的较高降解水平,最佳降解率出现在苯初始浓度7.04～13.2mg·L-1之间;苯在微生物细胞内外的浓度变化趋势呈现一致.-lgP(P为有机溶剂苯在细胞膜和水相中的分配系数的比值)的变化能够较好的表征苯在微生物细胞内外的降解趋势和毒性变化;当体系中苯的初始浓度大于8.8mg·L-1时,苯的降解率与P值变化趋于一致. |
| 英文摘要 |
| The experiments were made in laboratory to analyze the characteristics and principle of benzene's biodegradation using the microorganism(G-,Flavobacterium) taken from Daqing oil fields.Results show that the maximal concentration of benzene,which microorganisms could endure is between 8.8 mg·L-1and 17.6mg·L-1;microorganisms were inhibited as benzene's concentration was beyond 17.6mg·L-1.Trends of benzene's concentration in and out of microorganism's cell are almost same;the biodegradation could be achieved efficiently as the pH range of 6.5～7.0 and benzene initial concentration range of 7.04～13.2mg·L-1.Change of-lgP(P is the distributive ratio of benzene in membrane and water) could be illustrated the trends of toxicity and degradation of benzene in and out of microorganism's cell;the biodegradation rate varied simultaneously with the change of P as initial concentration of benzene was beyond 8.8mg·L-1. |
