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首页> 外文期刊>Environment international >Phytodegradation of extra heavy oil-based drill cuttings using mature reed wetland: an in situ pilot study
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Phytodegradation of extra heavy oil-based drill cuttings using mature reed wetland: an in situ pilot study

机译：使用成熟的芦苇湿地对超重油基钻屑进行植物降解：一项现场试验研究

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Environmental contamination caused by extra heavy oil-based drill cuttings (DCs) is a major problem in the Liaohe Oilfield, northeastern China. To study the potential effectiveness of the mature reed wetland in removing extra heavy oil contained in drill cuttings, biodegradation of extra heavy oils and study of the effects on soil property and ecophysiological and quality indices of reeds were carried out in a 2-year in situ pilot experiment. In the wetland, four reed beds were used to treat drill cuttings in various loadings: 0 (control), 5,20, and 40 kg/m~2, corresponding to 150, 600, and 1200 g/m~2 extra heavy oil hydrocarbons (HCs). The obtained results demonstrate that the mature reed wetland was effective at degrading extra heavy oils without extra fertilization. Removal efficiencies of reed bed 2 in the 0- to 80-cm soil profile increased with time, from 90.1% (first harvest season) to 95.8% (second harvest season). After 2 years, only 4.2% of the initial hydrocarbons residual was retained in the surface soil. There was no apparent adverse effects on the surface soil property during degradation of extra heavy oils and, actually, the deeper soil property and reed quality indices were improved at the end of the experiment. Phytotoxicity, resulting in reduction of reed yield, was observed in the most heavily treated beds in the first year. However, long-term reed yield recovered robustly. During the 2-year period, reed height and leaf number were slightly inhibited.
机译：在中国东北的辽河油田，由超重油基钻屑（DC）引起的环境污染是一个主要问题。为了研究成熟的芦苇湿地在去除钻屑中所含的重油方面的潜在效力，在2年的时间里进行了对重油的生物降解以及对芦苇对土壤性质和生态生理及质量指标的影响的研究。试点实验。在湿地中，使用四个芦苇床处理各种负荷的钻屑：0（对照），5,20和40 kg / m〜2，分别对应于150、600和1200 g / m〜2的超重油碳氢化合物（HCs）。获得的结果表明，成熟的芦苇湿地可有效地降解多余的重油而无需额外的施肥。芦苇床2在0至80厘米土壤剖面中的去除效率随时间而增加，从90.1％（第一收获季节）提高到95.8％（第二收获季节）。 2年后，仅4.2％的初始碳氢化合物残留物保留在表层土壤中。在特重油降解过程中，对表层土壤特性没有明显的不利影响，实际上，在实验结束时，更深的土壤特性和芦苇品质指数得到了改善。在第一年，在处理最严重的病床上观察到植物毒性，导致芦苇产量下降。但是，长期芦苇产量强劲恢复。在2年期间，芦苇高度和叶数均受到轻微抑制。

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