Plug Flow


This digester is an unmixed, heated, rectangular tank that digests raw livestock manure from dairy farms. Manure is collected by scraping and fed into the digester, where it degrades as it travels through the tank. To capture the biogas, an impermeable material covers the top of the tank.

The system generally consists of:

  • a mix tank
  • a digester tank with heat exchanger and biogas recovery system
  • an effluent storage structure
  • a biogas utilization system

Unlike covered lagoon systems, plug flow digesters are optimized to produce energy in any climate. Digested dairy solids can be separated and sold as a new product.

For technical information on RCM Plug Flow digesters, click RCM Plug Flow Technical Details.

Dozens of RCM Plug Flow digester systems are in operation throughout the globe.