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Clean up of petroleum-hydrocarbon contaminated soils using enhanced bioremediation system: Laboratory feasibility study

机译:使用增强型生物修复系统净化石油-碳氢化合物污染的土壤:实验室可行性研究

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The objective of this study was to assess the potential of applying enhanced bioremediation on the treatment of petroleum-hydrocarbon contaminated soils. Microcosm experiments were conducted to determine the optimal biodegradation conditions. The control factors included oxygen content, nutrient addition, addition of commercially available mixed microbial inocula, addition of wood chip and rice husk mixtures (volume ratio=1:1) as bulking agents, and addition of organic amendments (chicken manures). Results indicate that the supplement of microbial inocula or chicken manures could significantly increase the microbial populations in soils, and thus enhance the efficiency of total petroleum hydrocarbon (TPH) removal (initial TPH=5,500 mg/kg). The highest first-order TPH decay rate and removal ratio were approximately 0.015 day-1 and 85%, respectively, observed in microcosms containing microbial inocula (mass ratio of soil to inocula=50:1), nutrient, and bulking agent (volume ratio of soil to bulking agent=10 to 1) during 155 days of incubation. Results indicate that the first-order TPH decay rates of 0.015 and 0.0142 day-1 can be obtained with the addition of microbial inocula and chicken manures, respectively, compared with the decay rate of 0.0069 day-1 under intrinsic conditions. Thus, chicken manures have the potential to be used as substitutes of commercial microbial inocula. The decay rate and removal ratio can be further enhanced to 0.0196 day-1 and 87%, respectively, with frequent soil shaking and air replacement. Results will be useful in designing an ex situ soil bioremediation systems (e.g., biopile and land farming) for practical application.
机译:这项研究的目的是评估在处理石油-烃污染的土壤中应用增强生物修复的潜力。进行了缩影实验,以确定最佳的生物降解条件。控制因素包括氧气含量,营养添加,添加市售混合微生物接种物,添加木片和稻壳混合物(体积比= 1:1)作为填充剂以及添加有机改良剂(鸡粪)。结果表明,补充微生物接种物或鸡粪可以显着增加土壤中的微生物种群,从而提高总石油烃(TPH)去除效率(初始TPH = 5,500 mg / kg)。在含有微生物接种物(土壤与接种物的质量比= 50:1),养分和填充剂(体积比)的微观世界中,最高的一阶TPH衰减率和去除率分别约为0.015天-1和85%。在155天的培养时间内,土壤与填充剂之比= 10:1)。结果表明,分别添加微生物接种物和鸡粪便可以得到0.015和0.0142 day-1的一阶TPH衰减率,而在固有条件下为0.0069 day-1的衰减率。因此,鸡粪有潜力用作商业微生物接种的替代品。频繁的土壤摇动和空气置换可以将腐烂率和去除率分别提高到0.0196天-1和87%。结果对于设计实际应用的异地土壤生物修复系统(例如生物堆和土地耕作)将很有用。

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