System Basics

Digestion Systems Defined

Manure digestion systems consist of one or more units to process manure outputs from animal production facilities. 

Components

Digestion: During anaerobic (oxygen or air free) treatment, organic material is consumed by a spectrum of organism. See Article: Anaerobic Chain of Life for further discussion of the biological process. When properly designed, the end product is a methane rich biogas. Digesters have a holding area for biological activity and a means to capture gas produced. Digesters may be covered lagoons (heated or ambient), covered concrete or steel tanks (mixed or unmixed, heated or ambient).

Energy conversion: Biogas may be used to fuel specially designed boilers for heat recovery, or in engines attached to generators for electrical generation and heat recovery. Biogas is burned in a flare when economics do not warrant energy conversion.

Fiber recovery: Digester effluent may be passed through a system to separate and concentrate fibers. Finer fiber passes through the separator. This component may not be part of the system when economics do not warrant.

Fiber utilization: Once recovered the fiber must be composted before further use. Once biologically stable, the fiber may be used as an ingredient in potting soil mixes. Fiber may also be field applied.

Liquid nutrient storage: Digested liquid nutrient is stored for use at appropriate time.

Liquid nutrient usage: Land application provides nutrients and moisture for crop uptake. Remaining fiber builds soil tilth.

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Español Transforma el estierocol de las vacas y de los pueros en gas metano y electrcidad. Italiano Trasforma il letame delle mucche e dei maiali in gas metano e elettricita Portuguese
Transforma os estiercol do vacas e do porcos em gas metano e electricidade. Français Trans form le fumier de les vaches et de les cochons en gaz methane et electricite. English Environomics converts animal waste (manure) and bio-waste into profitable products: methane gas, electricity, fertilizer and peat.