Active interior gas collection/recovery

Similar to the active perimeter gas control system, an active interior gas collection/recovery system consists of gas extraction wells, gas collection headers, vacuum blowers or compressors, and a treatment system. However, it is used to directly remove the hazardous gases from the site (beneath a landfill), instead of off-site removal. Figure 16.9 shows a schematic view of such a system. 

Applications and limitations of the active interior gas collection/recovery system are similar to those of the active parameter gas control system. The active interior gas collection/recovery systems can be used at virtually any site where there is the capability to drill and excavate through landfilled material to the required depth. Limiting factors of the active interior gas collection/ recovery systems include the presence of free-standing leachate or impenetrable materials within the landfill. 

Active interior gas collection and recovery systems are designed to supplement capping and to prevent... 

To handle the methane gas generated from the 42.5-acre site, an active interior gas collection system was installed as shown in Figure 11. The installation consisted of 42 recovery wells, a gas collection header system, condensate traps, blower station and a flare station. In addition, a methane monitoring system consisting of thirty-two 2-inch wells was installed around the site (U.S. EPA, 1987). 

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