Process Flow Diagram of Dane County RNG Facility

This is a process flow diagram document for Dane County, Wisconsin's Renewable Natural Gas (RNG) facility upgrade procurement project. The diagram illustrates the operational systems and workflow for the RNG production facility located at 7242 Maahic Way, Madison, Wisconsin. The diagram depicts the current Pressure Swing Adsorption (PSA) system components, including nitrogen removal units (NRU) and carbon removal units (CRU), along with the flow of landfill gas through the facility for processing into renewable natural gas. An optional pre-proposal site meeting was scheduled for Friday, August 21, 2026 at 2:00 pm at 7102 Maahic Way, Madison, WI 53718, with all questions required to be submitted by Monday, August 24, 2026. Proposals for replacement or upgrade of the existing equipment are due by Thursday, September 3, 2026 at 2:00 pm. The selected firm will be required to coordinate closely with Dane County Waste + Renewable operations staff and comply with all applicable local ordinances and permitting requirements.

The project seeks to address aging infrastructure by replacing the current PSA system, which was commissioned in 2019 and has reached the end of its useful life, with the most efficient current technology for RNG production from landfill gas sources. Interested firms must demonstrate experience providing RNG production systems from LFG biogas in cold climates and possess capacity to manage projects of similar scope and complexity. Additionally, the facility requires expansion of LFG processing capacity to meet projected growth needs, as current volume is anticipated to exceed existing facility capacity in the near future. Work will be performed under a negotiated professional services agreement.