微生物菌剂对石油污染土壤的修复研究

Remediation of petroleum contaminated soil by bacterium microbial agent

在油田周围普遍存在着土壤盐渍化和石油污染双重问题。为了修复胜利油田周围的污染土壤,采取了淡水压盐、土壤翻耕、添加菌剂和营养盐等措施,测定了在修复过程中的水溶性盐、微生物、脱氢酶、石油含量等变化。结果表明,在修复过程中微生物数目、脱氢酶和石油降解率具有相关性,修复初期,三者均处于较高水平,随后微生物数目减少,脱氢酶活性降低,石油降解减缓;修复过程中,土著微生物、接种微生物和土壤透气性均起到重要作用。经过2个月修复实验,土壤中石油降解率能达到67.7%。

Soil salinization and petroleum contamination are dual problems around oil field.The petroleum contaminated soil remedying experiments were performed in Shengli Oil Field using some measures,such as irrigation for salt-leaching,soil tillage,addition bacterial agent and nutrient.The changes of water-soluble salts,microorganism,dehydrogenase,petroleum concentration were detected during remediation process.The results showed that there was a correlation among microorganism and dehydrogenase and petroleum degradation.All the three factors kept at high levels at the early.But after then,the number of microorganism reduced,the activity of dehydrogenase decreased,meanwhile the petroleum biodegradation rate declined.Indigenous microorganisms,inoculated microbiological,soil permeability all played an important role during remediation process.After two month of remediation,about 67.7% of petroleum in the contaminated soil were degraded.