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首页> 外文期刊>Journal of Hazardous Materials >Performance of air sparging systems: a review of case studies
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Performance of air sparging systems: a review of case studies

机译：空气喷射系统的性能：案例研究回顾

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Fluor Daniel GTI (now IT Corporation) has compiled a database of 49 completed in-situ air sparging case studies. Air sparging is a commonly used remediation technology which volatilizes and enhances aerobic biodegradation of contamination in groundwater and saturated zone soil The air sparging database was compiled to address questions regarding the effectiveness and permanence of air sparging, and to provide predictive indicators of air sparging success to aid in optimization of existing and future air sparging systems. In each case study, groundwater concentrations were compared before sparging was initiated, just before sparging was terminated, and in the months following shutdown of the sparging system. The case studies included both chlorinated solvents and petroleum hydrocarbon contamination, and covered a wide range of soil conditions and sparge system parameters. In many cases, air sparging achieved a substantial and permanent decrease in groundwater concentrations. Successful systems were achieved with both chlorinated and petroleum contamination, both sandy and silty soils, and both continuous and pulsed flow sparging. In other cases, however, a significant rebound of groundwater concentrations was observed after sparging was terminated. Rebound sometimes required 6 to 12 months to develop fully. Rebound was more frequently observed at sites contaminated with petroleum hydrocarbons than with chlorinated solvents. Petroleum-contaminated sites were more likely to rebound when initial groundwater contamination levels were high enough to suggest the presence of LNAPL or a smear zone of residual LNAPL. Rebound at petroleum sites appeared to be minimized by a high density of sparge wells addressing the entire source area and a high sparge air injection rate. In some cases, rebound appeared to be related to a rising water table.
机译：Fluor Daniel GTI（现为IT Corporation）已经汇编了一个数据库，其中包含49个完整的现场空气喷射案例研究。空气喷射是一种常用的补救技术，其挥发并增强地下水和饱和带土壤中污染物的需氧生物降解。建立了空气喷射数据库，以解决有关空气喷射的有效性和持久性的问题，并为空气喷射成功与否提供预测指标。有助于优化现有和未来的空气喷射系统。在每个案例研究中，在开始喷射之前，即将停止喷射之前以及在喷射系统关闭后的几个月内都比较了地下水浓度。案例研究包括氯化溶剂和石油碳氢化合物污染，涵盖了广泛的土壤条件和喷射系统参数。在许多情况下，空气喷射使地下水浓度大大降低并永久降低。氯化物和石油污染，沙质和粉质土壤，以及连续和脉冲流喷射都获得了成功的系统。但是，在其他情况下，喷射过程终止后，地下水浓度会显着反弹。反弹有时需要6到12个月才能完全发育。在被石油碳氢化合物污染的地点比被氯化溶剂污染的地点更容易观察到反弹。当最初的地下水污染水平足够高以表明存在LNAPL或残留LNAPL涂片区时，受石油污染的地点更有可能反弹。覆盖整个源头区域的高喷射井密度和高喷射空气注入率似乎使石油站点的回弹最小化。在某些情况下，反弹似乎与地下水位上升有关。

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