This study aimed to monitor the aerobic bioremediation of diesel oil-contaminated soil by measuring: a) the CO₂ production; 2) the fluorescein production; 3) the residual diesel oil concentration. Moreover, the complex dielectric permittivity was monitored through an open-ended coaxial cable. Several microcosms were prepared, changing the water content (u% = 8–15% by weight), the carbon to nitrogen ratio (C/N = 20–450), and the soil amount (200 and 800 g of dry soil). The cumulative CO₂ and fluorescein production showed similar trends, but different values since these two parameters reflect different features of the biological process occurring within each microcosm. The diesel oil removal efficiency depended on the microcosm characteristics. After 84 days, in the microcosms with 200 g of dry soil, the highest removal efficiency was achieved with a water content of 8% by weight and C/N = 120, while in the microcosms with 800 g of dry soil the best result was achieved with the water content equal to 12% by weight and C/N = 100. In the tested soil, the bioremediation process is efficient if the water content is in the range 8–12% by weight, and C/N is in the range 100–180; under these operative conditions, the diesel oil removal efficiency was about 65–70% after 84 days. The dielectric permittivity was monitored in microcosms with 200 g of dry soil. The open-ended coaxial cable detected significant variations of both the real and the imaginary component of the dielectric permittivity during the bioremediation process, due to the physical and chemical changes that occurred within the microcosms.

本研究旨在通过测量以下各项来监测柴油污染土壤的好氧生物修复： a) CO ₂产量；2）荧光素的生产；3）残余柴油浓度。此外，通过开放式同轴电缆监测复介电常数。准备了几个缩影，改变了含水量（u% = 8-15% 重量）、碳氮比（C/N = 20-450）和土壤量（200 和 800 克干土）。累积 CO ₂和荧光素产生显示出相似的趋势，但值不同，因为这两个参数反映了每个微观世界中发生的生物过程的不同特征。柴油去除效率取决于微观特征。84天后，在200g干土的微观世界中，当含水量为8wt%，C/N=120时，去除效率最高，而在800g干土的微观世界中，去除效率最高。在含水量等于 12%（重量）和 C/N = 100 的情况下实现。在测试的土壤中，如果含水量在 8-12%（重量）范围内，并且 C/N 在范围 100–180；在这些操作条件下，84 天后柴油去除效率约为 65-70%。介电常数是在微观世界中用 200 克干土壤监测的。由于微观世界中发生的物理和化学变化，开放式同轴电缆在生物修复过程中检测到介电常数的实部和虚部的显着变化。