Little Rock owns and operates a 300-ton-per-day municipal solid waste landfill that has been in operation since 1993. Based on the quantity of waste in place, it was determined that installation of a landfill gas (LFG) collection and control system was necessary in order to meet federal air regulations. The city contracted with Johnson Controls, Inc. (JCI) of Milwaukee, Wisconsin; American Environmental Group, Ltd. (AEGL) of Findlay, Ohio; and FTN to initially assess the feasibility of a landfill gas-to-energy (LFGTE) project.
FTN developed conceptual designs for the LFG collection and control system for the landfill and the transmission system of the LFG to a nearby industry, and we prepared estimates of the potential gas production from the landfill. To assess the quality and quantity of LFG from the existing landfill, the project team performed a pump (Tier III) test using a skid-mounted utility flare. The project team also developed construction and operational costs for the LFG system.
After demonstrating the feasibility of the project, the city contracted with JCI to install and operate the LFGTE system. FTN was contracted with JCI to develop the construction documents, acquire environmental permits for the project, acquire easements for the transmission pipeline, perform construction quality assurance, and provide long‑term operation and maintenance services for the system. AEGL was contracted with JCI to install the LFGTE system. The system was designed to eventually include the entire landfill as it develops.
The collected LFG is dehydrated and then transmitted approximately one mile to an industrial facility that blends the landfill gas with natural gas for use in its kilns.