In the present study, total petroleum hydrocarbon biodegradation by wheat straw biochar and active carbon (TPH) was investigated in gasoil-polluted soil around oil refinery of Shiraz, Iran. The experiment was conducted as split-split-plot in time based on completely randomized design with three replications. Various weights of biochar and active carbon (0, 20, 40, 60, 80, and 100 g kg⁻¹) were assigned to main plots, whereas particle sizes (1–2 mm for biochar and 0.05–2.05 mm for active carbon) were assigned to subplots, and the effects were monitored weekly. Biodegradation constant (K) for active carbon ranged from 0.0139 to 0.0328 day⁻¹, whereas it varied from 0.0145 to 0.0369 day⁻¹ for biochar. Also, this value was 0.0088 for control soil. Half-life for control soil was 78.7 days, which decreased as result of applying various size and weights of active carbon (21.13–49.8 days) and biochar (18.7–47.8 days). Thus, the technology used in this study provides a cheap, efficient, and environment friendly method which may be successfully applied in gasoil-polluted soils to enhance the environment for plants and soil microorganisms.

中文翻译：

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生物修复剂对汽油污染土壤生物降解的动力学监测

在本研究中，在伊朗设拉子炼油厂周围的汽油污染土壤中，研究了麦秸生物炭和活性炭（TPH）对总石油烃的生物降解作用。实验是根据完全重复的随机设计和三个重复的时间，按分割图进行的。将不同重量的生物炭和活性炭（0、20、40、60、80和100 g kg ^-1）分配给主要区域，而粒径（生物炭为1-2 mm，活性炭为0.05-2.05 mm）被分配给子图，每周监测效果。活性炭的生物降解常数（K）为0.0139至0.0328天^-1，而其变化为0.0145至0.0369天^-1用于生物炭。另外，对照土壤的该值为0.0088。对照土壤的半衰期为78.7天，这是由于使用各种大小和重量的活性炭（21.13–49.8天）和生物炭（18.7–47.8天）导致的。因此，本研究中使用的技术提供了一种便宜，高效且环境友好的方法，该方法可成功应用于汽油污染的土壤中，以改善植物和土壤微生物的环境。