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首页> 外文期刊>Environmental Science & Technology >Enhancing Biodegradation of Petroleum Hydrocarbons with Guanidinium Fatty Acids
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Enhancing Biodegradation of Petroleum Hydrocarbons with Guanidinium Fatty Acids

机译：用胍基脂肪酸增强石油烃的生物降解

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摘要

Bioremediation of hydrocarbon-contaminated soils is an attractive process for treating contaminated soils because it converts contaminants into harmless byproducts at low cost. However, the process is slow and typically requires months to years to reach regulated end points. In laboratory studies, we have been able to improve the process by adding selected guanidinium fatty acids to the contaminated soils. One of these materials, guanidinium cocoate, was synthesized from coconut acid and guanidine carbonate in a facile one-step process. Rates of biodegradation enhancement of nonvolatile hydrocarbons were evaluated using either oxygen and carbon dioxide respirometry in soil slurries or periodic measurements of extractable hydrocarbon residues in unsaturated soil microcosms. Results show rate enhancements in both soil slurries and unsaturated soil microcosms when these systems were treated with 500-1500 ppm of the surfactant. Adding small amounts of CGS to a silty clay soil containing aged lubricant-type hydrocarbons increased rates of hydrocarbon disappearance, mineralization, and oxygen utilization in unsaturated soil and soil slurry systems. Based on these initial investigations, doses of approximately 2 lb of CGS/t of soil appear effective at increasing rates of biodegradation.
机译：碳氢化合物污染土壤的生物修复是一种有吸引力的处理污染土壤的方法，因为它可以低成本将污染物转化为无害的副产品。但是，该过程很慢，通常需要数月至数年才能达到规定的终点。在实验室研究中，我们已经能够通过向污染的土壤中添加选定的胍基脂肪酸来改善这一过程。其中一种材料，可可胍盐，是通过椰子酸和碳酸胍以简便的一步法合成的。使用土壤浆液中的氧气和二氧化碳呼吸测定法或定期测量不饱和土壤微观世界中可提取的烃残留物，评估了非挥发性碳氢化合物的生物降解促进速率。结果表明，当这些系统用500-1500 ppm的表面活性剂处理时，土壤浆液和不饱和土壤微观结构的速率都会增加。在含有老化的润滑剂型碳氢化合物的粉质粘土中添加少量CGS，可以增加碳氢化合物的消失，矿化和不饱和土壤和泥浆系统中氧气的利用率。根据这些初步研究，大约2磅CGS / t的土壤剂量似乎对提高生物降解速率有效。

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