Technology to be employed
In this project, LFG will be combusted with no energy recovery.
Regarding to technology that will capture and destroy the methane currently generated at Chiltepeque?s municipal landfill, it is expected to employ an active LFG collection system. This technology is used in a number of landfills all over the world. In fact, a well-designed active collection system is considered the most effective means of gas collection.
The basic operation principle is the application of vacuum to extract the gas from the waste mass. The main components of the active collection system to be installed are the gas extraction wells and collection piping, the gas moving equipment represented by mechanical blowers, the LFG treatment unit includint the LFG condensate and flaring systems, and the monitoring and control system.
Based on landfill's current conditions, it has been projected to install an extraction well every 4,000 m2. That would imply the installation of approximately 28 extraction wells within the 11 hectare-area.
Gas extraction wells shall be connected to a master pipe that will carry the LFG to the blower facility.
The gas transportation equipment will include pipeline header system and blowers. A pipeline header system conveys the flow of collected LFG from the well system to blower facility.
The LFG treatment unit will consist of condensate and flare systems. A knock-out drum will be used to remove gas condensate.
Open flare will be installed to burn the LFG in a controlled environment to destroy harmful constituents and discharging them safely to the atmosphere.
Monitoring and control system will be used to measure actual LFG flow and composition to avoid the intrusion of ambient air into the extraction wells, thereby optimizing the gas extraction process.
It is important to mention that the gas extraction wells and collection piping shall be installed in successive steps, begining at the current landfill cells (3) and then as new cells are opened.

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