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Application of Biopile System for the Remediation of Petroleum-hydrocarbon Contaminated Soils

机译：生物堆系统在石油碳氢化合物污染土壤修复中的应用

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The objective of this study was to assess the potential of applying enhancedbioremediation on the treatment of petroleum-hydrocarbon contaminated soils. Microcosmexperiments were conducted to determine the optimal biodegradation conditions. The controlfactors included oxygen content, nutrient addition, addition of commercially available mixedmicrobial inocula, addition of wood chips and rice husks (volume ratio = 1:1) as bulkingagents, and addition of organic amendments (chicken manures). Results indicate that thesupplement of microbial inocula or chicken manures could significantly increase themicrobial populations in soils, and thus, enhance the efficiency of total petroleumhydrocarbon (TPH) removal (initial TPH = 5,500 mg/kg). The highest first-order TPH decayrate and removal ratio were approximately 0.015 day~(-1) and 85%, respectively, observed inmicrocosms containing microbial inocula (mass ratio of soil to inocula = 50:1), nutrient, andbulking 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 beobtained with the addition of microbial inocula and chicken manures, respectively, comparedwith the decay rate of 0.0069 day-1 under intrinsic conditions. Thus, chicken manures havethe potential to be used as substitutes of commercial microbial inocula. The decay rate andremoval ratio can be further enhanced to 0.0196 day~(-1) and 87%, respectively, with frequentsoil shaking and air replacement. Results will be useful in designing an ex-situ soilbioremediation systems (e.g., biopile, landfarming) for practical application.
机译：这项研究的目的是评估应用增强功能的潜力。 生物修复对石油-烃污染土壤的处理。缩影 进行实验以确定最佳的生物降解条件。控制 影响因素包括氧气含量，营养添加，添加市售混合物 微生物接种，增加木屑和稻壳（体积比= 1：1） 剂，以及有机修饰剂（鸡粪）的添加。结果表明 补充微生物接种物或鸡粪可显着增加 土壤中的微生物种群，从而提高了总石油的利用效率 碳氢化合物（TPH）的去除（初始TPH = 5,500 mg / kg）。最高一阶TPH衰减 的去除率和去除率分别约为0.015天〜（-1）和85％。 包含微生物接种物（土壤与接种物的质量比= 50：1），养分和 孵育155天期间的填充剂（土壤与填充剂的体积比= 10：1）。 结果表明，0.015和0.0142天〜（-1）的一阶TPH衰减率可以达到 分别通过添加微生物接种物和鸡粪获得 在固有条件下衰减率为0.0069 day-1。因此，鸡粪有 用作商业微生物接种替代品的潜力。衰减率和 去除率可分别进一步提高到0.0196天〜（-1）和87％ 摇动土壤和更换空气。结果将对设计异地土壤有用 实际应用中的生物修复系统（例如生物堆，土地耕作）。

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