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Asphaltenes biodegradation under shaking and static conditions

机译：振动和静态条件下沥青质的生物降解

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摘要

In this study the biodegradability of asphaltenes was investigated using four bacterial consortia isolated from oil contaminated soils and sludge. The species in consortium 1 were identified as Pseudomonas aeru-ginosa and Pseudomonas fluorescens. Consortium 2 contained Citrobacter amalonaticus and Enterobacter cloacae. Consortium 3 contained only one species identified as Staphylococcus hominis, and the species in consortium 4 were identified as Bacillus cereus, and Lysinibacillus fusiformis. Spectrophotometry at 281 nm wavelength was applied to quantify asphaltenes biodegradation. The biodegradation tests were performed in flasks with the initial asphaltenes concentrations of 2, 4,10, 20, 30 and 35 g/L for the four consortia. Under shaking conditions the best results were obtained with the initial asphaltenes concentration of 35 g/L With this initial concentration, consortia 1,2,3, and 4 were able to degrade 51.5%,43%, 21.5% and 33.5% of asphaltenes, respectively at 40 ℃ in two months. Under static conditions the best results were obtained with the initial asphaltenes concentration of 30 g/L. Under these conditions, consortia 1,2,3, and 4 were able to degrade 32%, 27%, 15%, and 24% of asphaltenes, respectively at 40 ℃ in two months. Kinetic studies showed that Tessier model could accurately describe asphaltenes biodegradation under shaking conditions. Kinetic parameters of the model were fitted by the method of Differential Evolution Optimization using a specific set of experimental data for each consortium. FT-IR analysis showed that alkene and alkyne functional groups were easily biodegradable while aldehydes resisted biodegradation.
机译：在这项研究中，使用从油污染土壤和污泥中分离出的四个细菌聚生体研究了沥青质的生物降解性。财团1中的物种被鉴定为铜绿假单胞菌和荧光假单胞菌。财团2包含柠檬酸杆菌和阴沟肠杆菌。财团3仅包含一种被鉴定为人葡萄球菌的物种，而财团4中的物种被鉴定为蜡状芽孢杆菌和梭状芽孢杆菌。应用281 nm波长的分光光度法定量沥青质的生物降解。在四个财团的初始沥青质浓度为2、4、10、20、30和35 g / L的烧瓶中进行生物降解测试。在摇动条件下，初始沥青质浓度为35 g / L可获得最佳结果。在该初始浓度下，财团1,2,3和4能够降解51.5％，43％，21.5％和33.5％的沥青质，分别在40℃下两个月。在静态条件下，初始沥青质浓度为30 g / L可获得最佳结果。在这些条件下，财团1,2,3和4能够在40℃的两个月内分别降解32％，27％，15％和24％的沥青质。动力学研究表明，Tessier模型可以准确地描述振动条件下沥青质的生物降解。该模型的动力学参数通过差异演化优化方法拟合，使用了每个财团的一组特定实验数据。 FT-IR分析表明，烯烃和炔烃官能团易于生物降解，而醛类则抗生物降解。

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  • 来源
    《Fuel》 |2014年第ptaa期|230-235|共6页
  • 作者

    H. Jahromi; M.H. Fazaelipoor; Sh. Ayatollahi; A. Niazi;

  • 作者单位

    Department of Chemical Engineering, Shahid Bahonar University of Kerman, Iran;

    Department of Chemical Engineering, Shahid Bahonar University of Kerman, Iran;

    School of Chemical and Petroleum Engineering, Sharif University of Technology, Iran;

    Institute of Biotechnology, Shiraz University, Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Asphaltenes; Biodegradation; Tessier kinetic model, Differential Evolution; Optimization;

    机译：沥青质生物降解;Tessier动力学模型;差异演化;优化;

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