耐盐石油降解菌性能及降解条件优化

从冀东油田钻井废液中筛选分离出耐盐石油降解菌Virgibacillus sp.(简称SJ菌),其在高含盐条件下对石油具有较好的降解效果,高达56.12%左右。考察了pH值、盐度、不同N和P形态等因素对SJ菌降解石油效果的影响。结果表明:SJ菌有较宽的pH值适应范围(pH值为6～10)和较好的耐盐能力(0.5%～20%),在pH值为9及NaCl质量浓度为5%时对石油类降解效果最好,其最佳利用N源和P源分别为(NH2)2CO和KH2PO4,该研究为油田高含盐含油废液处理提供了一条新途径。

Optimization of Degradation Properties and Conditions of Oil-degrading Bacteria with Salt Tolerance

Oil-degrading bacteria Virgibacillus sp(referred to as SJ bacteria) with high salt tolerance was isolated from drilling wastewater of Jidong Oilfield.It had a good degradation effect,up to about 56.12% on oil in high salt concentration conditions.This paper studied the impact of pH,salt concentration,and different nitrogen and phosphorus forms on oil degradation effects of SJ bacteria.The results showed that SJ bacteria had a wide pH range(pH 6 to 10) and a good salt tolerance(0.5% to 20%).Oil degradation rate was the highest at pH 9 and NaCl concentration of 5%.(NH2)2CO and KH2PO4 were the best N and P sources for SJ strain.Therefore this research supplied a new way for the treatment of oil wastewater with high salt concentration in the oilfield.