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混合菌剂堆肥强化含油污泥石油烃的降解特性
张传涛, 张璐, 徐开慧, 徐娟娟, 韩智超, 陈丽华
西北民族大学
摘要:
通过混合菌剂强化堆肥法处理含油污泥的小试试验,采用GC-MS图谱分析技术对石油烃中正构烷烃、藿烷、甾烷降解及石油烃降解规律进行分析. 结果表明:7%的油泥经微生物强化堆肥,49 d降解率在85%以上. 在石油烃中,3种系列的降解难易顺序为正构烷烃>藿烷>甾烷. 从3种系列的降解规律来看,微生物降油复合菌剂对高碳数正构烷烃的平均降解率(75.55%)大于对低碳数正构烷烃的平均降解率(62.98%),说明了对总石油烃中降解贡献最大的是正构烷烃;微生物降油复合菌剂对藿烷的降解率在90%以上,其对22S-31,32,33,34-四升藿烷降解率最高;微生物降油复合菌剂能够促进孕甾烷的转化且对重排甾烷的降解效果较明显,对甾烷类化合物中22,23,24-4-甲基-24-乙基-胆甾烷的降解效果最好 . 在石油烃降解规律方面,微生物降油复合菌剂对正构烷烃的奇偶碳降解优势不明显;藿烷的立体构型转化参数WC31αβ-22S/(W C31αβ-22S+W C31αβ-22R)值大于甾烷的立体构型转化参数WC29αα-20S/(W C29αα-20S+W C29αα-20R),从而解释了藿烷的降解易于甾烷的原因. 研究显示,微生物降油复合菌剂对石油烃中正构烷烃、藿烷、甾烷的降解效果均较好。
关键词:  堆肥法  含油污泥  混合菌剂  降解率  生物演化
DOI:
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基金项目:国家自然科学基金项目(21966028)(面上项目,重点项目,重大项目);中央高校基本科研项目(31920180032);兰州市创新创业人才项目(2018-RC-81)
Composting of Mixed Bacteria Enhanced the Degradation Characteristics of Petroleum Hydrocarbons in Oily Sludge
张传涛, 陈丽华
Abstract:
In a small trial test, a pilot experiment was applied to treat oily sludge with composting method by introducing mixed bacterial agent, the degradation of n-alkanes, hopane, gonane and petroleum hydrocarbons was analyzed by GC-MS spectroscopy for petroleum hydrocarbons. The results showed that 7% of the sludge was composted by microbial reinforcement, and the degradation rate was more than 85% in 49 days. The degradation rate of the three series of petroleum hydrocarbons was more than 85%. The order of degradation difficulty of 3 series of petroleum hydrocarbons was n-alkanes >hopane >gonane. From the three components of the degradation law, the average degradation rate of high-carbon n-alkanes (75.55%) was higher than that of low-carbon n-alkanes (62.98%), it showed that n-alkanes contributed most to the degradation of total petroleum hydrocarbons. The degradation rate of hopane could reach more than 90% by this mixed bacterial agent of oil-degrading, and the degradation rate of 22S-31,32,33,34-tetrakishomohopane was the highest among them. The mixed bacterial agent of oil-degrading could not only promote the transformation of pregnane,but also improve obviously the degradation of rearranged gonane, among the gonane compounds, the highest degradation rate was happened in 22,23,24-4-methyl-24-ethyl-cholestane.In terms of biological evolutionary characteristics, the mixed bacterial agent didn’t show obvious advantages in degrading the odd-even carbon n-alkanes; the stereoscopic structure’s transformation parameter of hopane WC31αβ-22S/(WC31αβ-22S+WC31αβ-22R) was higher than that of gonane WC29αα-20S/(W C29αα-20S+W C29αα-20R), which revealed the reason that the degradation of hopane was easier than gonane. Studied have shown that this mixed bacterial agent of n-alkanes, hopane and gonane had a relatively good degradation effect on various substances for petroleum hydrocarbons .
Key words:  compost method  oily sludge  mixed bacterial agent  degradation rate  biological evolution