Air sparging technology

The combination of SVE with air sparging technology. Air sparging involves the injection of air into the saturated zone of contaminated groundwater. The air bubbles enhance the... 

One of the simplest methods for adding oxygen to ground water is sparging with air. The main advantages of air sparging technologies are the relatively simple technical equipment and low costs. 

Air sparging technologies have been described, for example, by Javanmar-dian and Glasser [42] and by Leeson et al. [52] and have been used for the ehmination of MTBE concentrations up to 40 mg L . ... 

Even though traditional air sparging (vertical well, injection of air) has proven to be successful in a wide variety of held applications, alternative strategies exist that can make air sparging applicable to other conditions. Sometimes other remedial technologies such as pump and treat and bioremediation are used in conjunction with the air sparging technology to address site-specific contaminant conditions. 

An important innovation in bioremediation technology has been the use of air sparging to oxygenate groundwater. A typical system is presented in Figure 14.6. Using this technique, the removal of contaminants is achieved using two simultaneous mechanisms ... 

Often biodegradation can be enhanced by the use of other technologies, such as air sparging, SVE, MPE, thermal, or ISCO... 

Most of the 123 air sparging projects were conducted at full scale (120 projects) and were ongoing (104 projects) at the time the profile was prepared. In addition, while most (87) of the projects used air sparging alone or in conjunction with SVE, 36 projects supplemented air sparging treatment with pump-and-treat or other technologies, such as MPE, bioremediation, free product recovery, and ISCO. 

The treatment performance data for 123 projects show that air sparging (either alone or in combination with other technologies) has been used to reduce MTBE in groundwater from concentrations >1,000,000 to <50 pg/L. The median project duration for the 19 completed sites ranged from 1 to 5 years. Although two of the 123 projects listed TBA as a cocontaminant, neither of these projects reported TBA concentrations before or after treatment no data for other fuel oxygenates were reported. 

Most of the 138 SVE projects were full scale (137 projects). In addition, most of the projects used SVE in conjunction with air sparging (74 projects) or SVE alone (20 projects) the remaining projects supplemented SVE treatment with bioremediation, ISCO, pump-and-treat, or multiple technologies. 

Most of the 100 pump-and-treat projects were full scale (84 projects) and were ongoing (78 projects) at the time that its profile was published. In addition, while most (54%) of the projects used pump-and-treat alone, almost half supplemented pump-and-treat with air sparging, SVE, or other technologies, such as phytoremediation, bioremediation, or ISCO. 

T0012 Advanced Processing Technologies, Inc., Air-Sparged Hydrocyclone T0020 Aeration Basins—General... 

The company has applied ex situ landfarming technology to several sites. The process is designed to contaminated site containing polycyclic aromatic hydrocarbons (PAHs), phthalate esters, petroleum hydrocarbons, and pentachlorophenol (PCP). The company has also used in situ techniques such as air sparging bioremediation. 

---