Volatile liquids are defined as liquids that will vaporize at normal atmospheric pressures and temperatures. When environmental pollutants are volatile, sometimes blowers are used to remediate the site. For example, if an underground tank leaks at a fueling station, blowers can be attached to well casings placed in the ground around the contaminated area and the blowers are used to vacuum the gasoline vapors from the soil. This process is called soil vapor extraction. Another technique is to inject air into an underground contamination plume to dilute concentrated vapors (soil air injection). A combination of vacuum extraction and simultaneous air injection can be used for more rapid remediation. Sometimes contaminated groundwater is pumped into tanks and dosed with bacteria that consume the waste products. In this process (groundwater pump and treat), blowers are used to aerate the tanks and oxygenate the bacteria. These are a few of the many different processes in the environmental remediation industry that utilize blowers.
In a typical scenario, a site owner realizes that there is a problem. Perhaps a fueling station owner notices that they are purchasing significantly more gasoline than they are selling. The site owner contracts an environmental consultant to evaluate the severity of the problem. The consultant prepares a remedial action plan. The site owner, consultant and the EPA meet to decide which technology will be used to remediate the site. Most large engineering firms have an environmental division that specializes in bidding these projects. The engineering firm will design a process that meets the intent of the remedial action plan and prepare a formal offer. The successful bidder will purchase the materials needed for the project, install the system, and operate the system for the life of the project.