Anaerobic Digestion

BIOFerm provides a complete suite of anaerobic digesters to the North American market for varying types and amounts of feedstock. These turnkey systems include: FERMADOR (continuously-stirred tank reactor), FERMIGMA (plug-flow reactor), and FERMITIGO (batch reactor).

Different types of biogas systems are better suited for different types of organic waste. Our industry experience has taught us that it is never a “one-size-fits-all” solution; we ensure our clients receive the system that best solves their organic waste and biogas needs.


6-15% Total Solids

FERMADOR complete-mix anaerobic digester tanks utilize unique paddle mixers to ensure homogeneous mixing. Ideally operating in the 6-15% total solids (TS) range at mesophilic or thermophilic temperatures (project-dependent), a variety of feedstocks can be processed. Possible feedstocks include manure, biosolids, food waste, brewery waste, energy crops, and other low-solids organics. FERMADOR digester tanks are available in different sizes and can be combined, depending on tank size and expansions. FERMADOR applications include dairies, wastewater treatment plants, food processors, and more. FERMADOR can also be paired with the horizontal plug-flow digester, FERMIGMA, for processing higher solids feedstocks like wastewater sewage sludge, waste from food processors, breweries, and more.


12-25% Total Solids

FERMIGMA is a plug-flow digester with agitation that is typically designed to operate in the mesophilic temperature range. The steel tank has a rectangular footprint and has a horizontal paddle mixer that runs the full length of the tank. The mixer is powered by planetary drive units both ends, and the tank is heated through the horizontal mixer shaft. Depending on the project, solid or liquid feeding systems are utilized. FERMIGMA is often combined with FERMADOR tanks.


25%+ Total Solids

Our FERMITIGO digesters process high-solids organics, such as food waste, yard waste, and other stackable organics. Although feedstocks may vary in solids contents, the system typically operates within the 25%+ total solids (TS) range. During this batch-style digestion process (which requires no internal moving parts or pumpable waste stream), organics remain stationary inside the individual, rectangular fermentation chambers. Modular design allows the system to be scaled according to the feedstock amount available. Operating in the mesophilic temperature range, FERMITIGO is ideal for municipalities, food processors, campuses, composters, etc.

Small-Scale system

6-25% Total Solids

The small-scale FERMADOR or FERMIGMA systems are simple, flexible and easily integrated into already established operations.  Modular components can be combined according to specific needs and many combinations of input materials are possible. The small-scale FERMADOR or FERMIGMA’s uniquely compact design expands the opportunities for energy generation to operations with limited footprint or smaller waste streams (typically 1,000-6,500 tons of waste/year).