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首页> 外文期刊>International Journal of Environmental Science and Technology >Bioremediation of heavily hydrocarbon-contaminated drilling wastes by composting
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Bioremediation of heavily hydrocarbon-contaminated drilling wastes by composting

机译：堆肥对重烃污染的钻井废料进行生物修复

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Oil-based drilling cuttings comprise a large and hazardous waste stream generated by oil and gas wells drilling operations. Oil-based cuttings are muddy materials with high contents of salts and hydrocarbons. Composting strategies have shown to be effective in the biodegradation of petroleum hydrocarbons, and it offers numerous advantages in comparison with other bioremediation methods. In order to assess the effectiveness of drilling cuttings bioremediation by composting with food and garden wastes, an experiment was conducted in 60-L reactors for 151 days. Four treatments were carried out: only oil-based cuttings, two proportions (in a volume basis) of organic wastes to drilling cuttings (33 and 75 %) and only organic wastes (as a traditional composting reference), with pine-tree woodchips as bulking agent. High degradation percentages of total hydrocarbons (ae82 %), n-alkanes (ae96 %) and the 16 USEPA-listed polycyclic aromatic hydrocarbons (ae93 %) were reached in the treatment with 75 % of organic wastes, and applying 33 % of organic wastes was not more effective than not applying organic wastes for the drilling cuttings hydrocarbons biodegradation. Furthermore, in the treatment with 75 % of organic wastes, alkanes half-life and polycyclic aromatic hydrocarbons half-life were about 10 times and four times lower, respectively, than those in the treatment with 33 % of organic wastes. Possibly, lower hydrocarbons and salts initial concentrations (i.e., lower toxicity), higher microbial counts, adequate nutrient proportions and water content supported a high biological activity with a consequent elevated biodegradation rate in the treatment with 75 % of organic wastes.
机译：油基钻屑包括油气井钻探作业产生的大量危险废物流。油基钻屑是含盐和碳氢化合物含量高的泥泞材料。堆肥策略已显示对石油烃的生物降解有效，并且与其他生物修复方法相比，它具有许多优势。为了评估通过与食物和花园垃圾堆肥进行钻屑生物修复的有效性，在60升反应器中进行了151天的实验。进行了四种处理：仅油基碎屑，占钻屑的有机废物的比例（按体积计）为两种（分别为33％和75％），仅有机废物（作为传统的堆肥参考），而松树木屑为填充剂。在处理75％的有机废物和33％的有机废物的处理过程中，总碳氢化合物（ae82％），正构烷烃（ae96％）和16种在USEPA列出的多环芳烃（ae93％）中的降解率很高它比不使用有机废物进行钻屑碳氢化合物生物降解更有效。此外，在用75％的有机废物处理中，烷烃的半衰期和多环芳烃的半衰期分别比用33％的有机废物处理的低约10倍和4倍。较低的碳氢化合物和盐类初始浓度（即较低的毒性），较高的微生物数量，适当的营养成分和水含量可能支持了高生物活性，因此在处理75％的有机废物时具有较高的生物降解率。

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