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Treatment of Vapors from In Situ Thermal Remediation: Selecting the Best Option and Operating it Properly(PPT)

机译:从原位热补救治疗蒸气:选择最佳选择并适当地操作(PPT)

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In situ thermal remediation (ISTR) technologies are frequently used for treatment of highly contaminated source zones including sites with light and dense nonaqueous-phase liquids (LNAPL/DNAPL). Since thermal treatment often results in removal of tens or hundreds of thousands of pounds of chemicals from the subsurface in a period of several months, vapor treatment systems must be designed to handle dynamic process conditions including elevated temperatures, substantial moisture content, high contaminant mass loading and often acidic conditions. In addition, vapor treatment systems must be robust, providing reliable operational up-time because, unlike conventional “cold” vapor extraction systems, a hot ISTR site will continue to generate steam and contaminant-laden vapors even if the extraction system shuts down. An improperly or inadequately designed or operated vapor treatment system can cause schedule delays, cost over-runs and the potential release of uncontrolled fugitive emissions. Included is a discussion of lessons learned and means and methods to improve reliability of ISTR vapor treatment systems at both the design and field-operational stage. Knowledge and consideration of these critical design and operational parameters is important not only for thermal remediation contractors, but also for regulators, consultants and other remediation practitioners who may design, specify, evaluate or select contractors or vapor treatment systems for ISTR projects.
机译:原位热补救(ISTR)技术经常用于治疗高度污染的源区,包括具有光和致密的非水相液体的位点(LNAPL / DNAPL)。由于热处理经常导致从地下移除几十个月的时间,蒸气处理系统必须设计成处理动态工艺条件,包括升高的温度,大量水分含量,高污染物质量负荷并且通常是酸性条件。此外,蒸汽处理系统必须是坚固的,提供可靠的操作上升时间,因为与传统的“冷”蒸汽提取系统不同,即使提取系统关闭,热的ISTR部位也将继续产生蒸汽和污染物的蒸气。无当或不充分设计或操作的蒸气处理系统可能导致计划延迟,成本过度运行和不受控制的逃逸排放的潜在释放。包括讨论了培训的经验教训和方法和方法,以提高设计和现场运行阶段的ISTR蒸汽处理系统的可靠性。对这些关键设计和操作参数的知识和考虑不仅是热修复承包商的重要性,而且对于监管机构,顾问和其他可以设计,指定,评估或选择ISTR项目的蒸气处理系统的修复从业者来说是重要的。

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