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Case History #4 273
• Designing the system
• Administering contracts, including coordinating access rights,
railroad access, and obtaining all appropriate permits
• Creating a health and safety plan
• Managing construction
• Coordinating utility connections
In addition, RMT attended public meetings to address concerns
from the Village Board and residents, and worked with the Village
of Antioch and ACHS to resolve any conflicts that arose during the
project.
PROJECT DESIGN
This project included 12 Capstone MicroTurbines, to turn
landfill gas into the primary energy source for the 262,000–square-foot
ACHS. This is the first landfill gas project in the U.S. to be owned by
and to directly provide heat and power to a school.
The challenges surrounding the design of this system, are
discussed below.
HOD Landfill Gas Collection System Tie-in
The collection system at the HOD Landfill, which includes
35 landfill gas extraction wells, a blower, and a flare, must remain
operational to control landfill gas migration. Therefore, the construction
of the new cogeneration system required connection to the existing
system to allow for excess LFG to be combusted in the flare. Additional
pipes and control valves were included in the system to route the gas
to the conditioning and compression building and to allow the existing
blower and flare to remain operational, while providing the correct
volume of landfill gas to the microturbines.
Gas Cleaning and Compression
The gas that is collected from the landfill is conditioned through
a series of chillers that drop the gas temperature to -10°F to remove
moisture and siloxane compounds. A schematic diagram indicating the
LFG compression and conditioning system is shown on Figure 17-2. An
activated carbon unit is also included to remove additional impurities.