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Enhanced biodegradation of crude oil in contaminated soil by inoculation of hydrocarbon-degraders

机译：接种烃降解剂可增强受污染土壤中原油的生物降解能力

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摘要

Inoculation of hydrocarbon-degraders will be a favorable feature for bioremediation of oil-contaminated soil. In this work, enhanced biodegradation of crude oil was investigated using the process, wherein inoculation of seven active hydrocarbon-degraders were isolated from the contaminated site. Preliminary results showed that isolated seven active bacterial strains were Acinetobacter SY21, Neisseria SY22, Plesiomonas SY23, Xanthomonas SY24, Azotobacter SY42, Flavobacterium SY43, and Pseudomonas SY44, respectively. Seven active degraders belong to gram-negative bacteria. They were capable of degrading crude oil and six other hydrocarbons (normally octane, paraffin wax, benzene, methylbenzene, phenol, and naphthalene) as carbon source and energy. Their biodegradation efficiencies of oil were higher than 80% after 8 d. The highest degradation rate of 2.34 × 10~(-3) mg cell~(-1) d~(-1) was obtained for bacterial strain SY43 (Etwinia sp.), followed by a degradation rate of 1.50 × 10~(-3) mg cell~(-1) d~(-1) for bacterial strain SY23 (Plesiomonas sp.). In addition, it was observed that a higher removal efficiency of TPH depends on large number of strains by more inoculums of isolates. Finally, it has been found that the adaptation of isolates was well because there was no decrease in the CPU even when the concentration of crude oil was up to 34250 mg/kg. Moreover, the removal efficiency of total petroleum hydrocarbon (TPH) was up to 88.4% after active oil degrader was inoculated while the corresponding removal efficiency of TPH was 1.4% without inoculums. These results indicated that both the SY43 and SY23 strains are easy to grow and establish a local ecology in the oil-contaminated soil. That is, biodegradation of crude oil in contaminated soil was enhanced by inoculating isolates.
机译：烃降解剂的接种将是对油污土壤进行生物修复的有利特征。在这项工作中，使用该方法研究了提高的原油生物降解能力，其中从受污染的地点分离出了七个活性烃降解剂的接种物。初步结果显示，分离出的七个活性细菌菌株分别为不动杆菌SY21，奈瑟菌SY22，假单胞菌SY23，黄单胞菌SY24，固氮菌SY42，黄杆菌SY43和假单胞菌SY44。七个活性降解物属于革兰氏阴性细菌。它们能够降解原油和其他六种碳氢化合物（通常是辛烷，石蜡，苯，甲基苯，苯酚和萘）作为碳源和能源。 8 d后，它们对油的生物降解效率高于80％。菌株SY43（Etwinia sp。）的最高降解率为2.34×10〜（-3）mg cell〜（-1）d〜（-1），随后降解率为1.50×10〜（-） 3）用于细菌菌株SY23（Plesiomonas sp。）的mg细胞〜（-1）d〜（-1）。另外，观察到TPH的较高去除效率取决于更多菌株的接种物的大量菌株。最后，已经发现分离物的适应性很好，因为即使当原油浓度高达34250 mg / kg时，CPU也不降低。此外，接种活性油降解剂后，总石油烃（TPH）的去除率高达88.4％，而相应的TPH的去除率为1.4％（无接种量）。这些结果表明SY43和SY23菌株都易于生长，并在被油污染的土壤中建立了局部生态。也就是说，通过接种分离菌可以提高原油在受污染土壤中的生物降解能力。

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  • 来源
    《Desalination and water treatment》 |2014年第27期|5126-5135|共10页
  • 作者

    Jinlan Xu; Haixin Deng; Tinglin Huang; Shaohua Song;

  • 作者单位

    School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;

    School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;

    School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;

    School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;

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  • 正文语种 eng
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  • 关键词

    Isolating; Hydrocarbon-degraders; Biodegradation of crude oil; Inoculum; Bioremediation;

    机译：隔离烃降解剂;原油的生物降解;接种物生物修复;

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