NAPL污染土壤-水资源的热强化生物修复

B. Yadav, P. Gupta
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引用次数: 1

摘要

使用传统的物理化学技术来修复烃类,如非水相液体(NAPL)污染的地点,可能会扰乱(次)表面的自然生物环境。然而,据报道,自然衰减非常缓慢,有时在现有场地条件下导致不完全清除。特别是寒冷地区微生物生长相当缓慢,这降低了生物修复在处理napl污染土壤水中的适用性。因此,本研究旨在通过实际实验来评价热强化生物修复技术对萘普勒污染土壤水的处理效果。为此,设计并制作了一种一维大柱装置。该柱集成了自动温度控制槽,以保持不同的土壤-水温度(4°C, 20°C, 28°C和36°C),这些温度在柱内填充的多孔介质中循环。结果表明,所选择的轻质NAPL在28 ~ 36℃的高温下具有较高的甲苯溶解速率。结果表明,在4°C、20°C、28°C和36°C的土壤-水温度水平下,NAPL的生物降解率分别为0.002、0.008、0.012和0.015 mg L/h。结果表明,在较高的土壤-水温度(28°C和36°C)下,微生物活动的显著增加加速了土壤中NAPL的生物降解速率。本研究的结果可能有助于利用太阳能或地热加热系统进行热强化生物修复,以处理萘普勒污染的地点。
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Thermally Enhanced Bioremediation of NAPL Polluted Soil-Water Resources
The use of conventional techniques for physico-chemical remediation of hydrocarbon such non-aqueous phase liquids (NAPL)-polluted sites may disturb the natural biotic settings of the (sub)-surface. However, natural attenuation has been reported very slow and sometime results as incomplete removal under prevailing site conditions. In particular, microbial growth is quite slow in cold regions, which reduces the applicability of bioremediation in treating NAPL-polluted soil-water. Thus, this study aims to evaluate the thermally enhanced bioremediation techniques to treat NAPL-polluted soil-water using practical experiments. A one-dimensional large column setup was designed and fabricated for this purpose. The column was integrated with automatic temperature controlling baths to maintain different soil-water temperatures (4 °C, 20 °C, 28 °C, and 36 °C), which was circulated through the porous media filled in the column setup. Results show a high dissolution rate of toluene, the selected light NAPL, at an elevated temperature of 28–36 °C. The biodegradation rates of the NAPL were found to be 0.002 mg L/h, 0.008 mg L/h, 0.012 mg L/h, and 0.015 mg L/h at soil-water temperature levels of 4 °C, 20 °C, 28 °C, and 36 °C, respectively. It was found that at high soil-water temperature (28 °C and 36 °C), a significant increment in microbial actions accelerates the biodegradation rate of NAPL in the subsurface system. The outcomes of this study may help in treating NAPL-polluted sites using solar or geo-thermal based heating systems for thermally enhanced bioremediation.
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