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首页> 外文学位 >Pulsed biosparging of the E10 gasoline source in the Borden Aquifer.
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Pulsed biosparging of the E10 gasoline source in the Borden Aquifer.

机译：Borden含水层中E10汽油源的脉冲式生物喷射。

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摘要

Air sparging is a technique used to remediate gasoline contamination. In sparging, air is injected below the target zone and removes contamination via two separate mechanisms volatilization and biodegradation. In volatilization, the air contacts the contamination as it moves upward. The contaminant will partition to the vapor phase based on its volatility and will be removed as the air reaches the atmosphere. For biodegradation, the oxygen in the airstream is used for microbial activity. Pulsed air sparging, otherwise known as pulsed biosparging, has been found to be more effective than continuous air sparging. Pulsed biosparging enhances treatment because it induces groundwater movement and mixing.The remedial system consisted of two major components: the air sparging system, with three injection points and a soil gas collection system. The soil gas collection system was comprised of an airtight box that covered the source area and the monitoring wells upgradient and downgradient of the source. Off-gas from the soil gas collection system was monitored continuously using a PID. The off-gas was also sampled frequently for BTEX, pentane, and hexane to determine the hydrocarbon mass removed and for O2 and CO 2 to determine biodegradation rates.The remedial system ran for approximately 280 hours over 33 days. Of the estimated 22.3 kg of gasoline residual in the source zone, 4.6 kg or 21% of the residual was removed via volatilization and 4.9 kg or 22% of the residual was removed via biodegradation. Leakage outside the system was estimated at less than 0.1% of the total mass. Groundwater samples were collected when the last sparged air was calculated to arrive at the row 2 downgradient fence. The average BTEX groundwater concentration after sparging was 40% of the pre-sparging concentration. The benzene mass discharge decreased 27%, the ethylbenzene mass discharge decreased 65%, the p/m-xylene mass discharge decreased 6%, and the o-xylene mass discharge decreased 5%. The mass discharge for naphthalene and TMB isomers increased 19%. However, these values fit in with long-term groundwater concentration trends. Additional sampling is recommended to determine if the sparging made a significant impact on mass discharge leaving the source.The general mechanisms for treatment of gasoline sources using air sparging are relatively well characterized. However, air flow through the subsurface and the total hydrocarbon mass lost are difficult to predict and quantify. This project was intended to quantify the mass lost through volatilization and through biodegradation at the E10 gasoline source using pulsed biosparging, and to determine the effect of the source zone removal on downgradient dissolved BTEX concentrations.
机译：空气喷射是用于补救汽油污染的技术。在喷射过程中，空气被注入目标区域下方，并通过两种独立的机制挥发和生物降解去除污染物。在挥发过程中，空气在向上移动时会接触到污染物。污染物将根据其挥发性分配到气相中，并随着空气到达大气而被除去。为了生物降解，将气流中的氧气用于微生物活动。已发现脉冲空气喷射，也称为脉冲生物喷射，比连续空气喷射更有效。脉冲生物喷射法会引起地下水的流动和混合，从而增强了处理效果。补救系统包括两个主要组成部分：空气喷射系统（带有三个注入点）和土壤气体收集系统。土壤气体收集系统由一个覆盖源头区域的密闭盒和监测井的源头上下坡度组成。使用PID连续监测来自土壤气体收集系统的废气。还经常对废气进行BTEX，戊烷和己烷采样以测定去除的烃量，并测定O2和CO 2以确定生物降解率。整治系统运行了约280小时，历时33天。在源区估计的22.3公斤汽油残留物中，有4.6公斤或21％的残留物通过挥发去除，而4.9公斤或22％的残留物通过生物降解去除。系统外的泄漏估计不到总质量的0.1％。在计算最后一次喷射的空气到达第2行下降栅栏时，收集了地下水样本。喷射后，BTEX的平均地下水浓度为预喷射浓度的40％。苯质量排放降低了27％，乙苯质量排放降低了65％，对/二甲苯质量排放降低了6％，邻二甲苯质量排放降低了5％。萘和TMB异构体的质量排放增加了19％。但是，这些值符合长期的地下水浓度趋势。建议进行额外采样，以确定喷射是否对离开排放源的质量排放有显着影响。使用空气喷射处理汽油源的一般机制具有相对较好的特征。但是，很难预测和量化通过地下的气流和损失的总烃量。该项目旨在量化通过脉冲生物喷射在E10汽油源处通过挥发和生物降解而损失的质量，并确定源区去除对降级的溶解BTEX浓度的影响。

著录项

  • 作者

    Lambert, Jennifer Marie.;

  • 作者单位

    University of Waterloo (Canada).;

  • 授予单位 University of Waterloo (Canada).;
  • 学科 Engineering Environmental.
  • 学位 M.Sc.
  • 年度 2009
  • 页码 164 p.
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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