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首页> 外文会议>Sixth International in Situ and On-Site Bioremediation Symposium, 6th, Jun 4-7, 2001, San Diego, California >RAPESEED OIL FOR EXTRACTION OF LIPOPHILIC POLLUTANTS FROM SOIL PARTICLES
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RAPESEED OIL FOR EXTRACTION OF LIPOPHILIC POLLUTANTS FROM SOIL PARTICLES

机译：从菜籽中提取脂多糖的菜籽油

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The aim of this study was to enhance the efficiency of bioslurry reactors by studying the possibility of a pre- or postbioslurry treatment. Because of the lipophilic character of many persistent pollutants the use of a non-toxic lipophilic extraction medium seemed suitable. Therefore, a new method was tested for the separation of creosote constituents from their soil matrix using vegetable oil. In shake flask experiments soil slurry was mixed with rapeseed oil and a surfactant (Brij 30) under varying conditions. The soil, taken from an old gasworks site in Stockholm (Sweden) mainly polluted with creosote, was sampled for analyses of 16 U.S. EPA polycyclic aromatic hydrocarbons (PAHs). The experiments have shown the pretreatment with rapeseed oil to be effective. The amount of oil used seemed to play a crucial role in the extraction process. In case of oil surplus, up to 87 % of high-molecular-weight (HMW) PAHs diffused into the vegetable oil, which formed a layer of small droplets on top of the water phase. Less oil caused inhibition of creosote transfer to the oil phase. The time for extraction was also studied. When multiple extractions were performed time was of minor importance. For example, two extractions during one day each gave a better separation (77 %) of pyrene than one extraction during eight days (67 %). The results obtained using the new method were compared with those of biodegradation during a bioslurry treatment of 30 days, indicating a maximum degradation of 55 % for HMW PAH. This two-liquid-phase (TLP) bioslurry treatment might become a more environmentally friendly alternative to the present chemical/physical pretreatment methods.
机译：这项研究的目的是通过研究生物浆处理前后的可能性来提高生物浆反应器的效率。由于许多持久性污染物的亲脂特性，因此使用无毒的亲脂提取介质似乎是合适的。因此，测试了一种使用植物油将杂酚油成分从土壤基质中分离出来的新方法。在摇瓶实验中，将土壤浆液在不同条件下与菜籽油和表面活性剂（Brij 30）混合。从主要由杂酚油污染的斯德哥尔摩（瑞典）一个老煤气厂取下的土壤被采样，用于分析16种美国EPA多环芳烃（PAHs）。实验表明用菜籽油进行预处理是有效的。石油的使用量似乎在提取过程中起着至关重要的作用。如果出现油脂过剩，高达87％的高分子量（HMW）PAH会扩散到植物油中，从而在水相的顶部形成一层小液滴。较少的油导致杂酚油向油相转移的抑制。还研究了提取时间。当进行多次提取时，时间的重要性不大。例如，一天中的两次萃取比八天的一次萃取（67％）分离的gave更好（77％）。将使用新方法获得的结果与生物浆处理30天期间的生物降解结果进行了比较，表明HMW PAH的最大降解率为55％。这种两液相（TLP）生物淤浆处理可能会成为当前化学/物理预处理方法的一种更环保的替代方法。

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