First of all the crude oil field doesn't exist, while there's no question of the manure's existence. And even if you had the oil field, as long as you keep livestock you'll be up to here in manure. Digestion Systems Defined Manure digestion systems consist of one or more units to process manure outputs from animal production facilities. See Articles 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.
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. Finer fiber passes through the separator. This component may not be part of the system when economics do not warrant. Once biologically stable, the fiber may be used as an ingredient in potting soil mixes.