Stages Of Anaerobic Digestion Part 2

Stages Of Anaerobic Digestion 2

Anaerobic decomposition is a complex process.  It occurs in three basic stages as the result of the activity of a variety of microorganisms.  Initially, a group of microorganisms converts organic material to a form that a second group of organisms utilizes to form organic acids.  Methane-producing (methanogenic) anaerobic bacteria utilize these acids and complete the decomposition process.

Anaerobic digestion, which takes place in three stages inside an airtight container, produces biogas. Different kinds of micro-organisms are responsible for the processes that characterize each stage.

A variety of factors affect the rate of digestion and biogas production.  The most important is temperature.  Anaerobic bacteria communities can endure temperatures ranging from below freezing to above 135°F (57.2°C), but they thrive best at temperatures of about 98°F (36.7°C) (mesophilic) and 130°F (54.4°C) (thermophilic).  Bacteria activity, and thus biogas production, falls off significantly between about 103° and 125°F (39.4° and 51.7°C) and gradually from 95° to 32°F (35° to 0°C).

In the thermophilic range, decomposition and biogas production occur more rapidly than in the mesophilic range.  However, the process is highly sensitive to disturbances, such as changes in feed materials or temperature.  While all anaerobic digesters reduce the viability of weed seeds and disease-producing (pathogenic) organisms, the higher temperatures of thermophilic digestion result in more complete destruction.  Although digesters operated in the mesophilic range must be larger (to accommodate a longer period of decomposition within the tank [residence time]), the process is less sensitive to upset or change in operating regimen.

To optimize the digestion process, the biodigester must be kept at a consistent temperature, as rapid changes will upset bacterial activity.  In most areas of the United States, digestion vessels require some level of insulation and/or heating.  Some installations circulate the coolant from their biogas-powered engines in or around the digester to keep it warm, while others burn part of the biogas to heat the digester.  In a properly designed system, heating generally results in an increase in biogas production during colder periods.  The trade-offs in maintaining optimum digester temperatures to maximize gas production while minimizing expenses are somewhat complex.  Studies on digesters in the north-central areas of the country indicate that maximum net biogas production can occur in digesters maintained at temperatures as low as 72°F (22.2°C).

Other factors affect the rate and amount of biogas output.  These include pH, water/solids ratio, carbon/nitrogen ratio, mixing of the digesting material, the particle size of the material being digested, and retention time.  Pre-sizing and mixing of the feed material for a uniform consistency allows the bacteria to work more quickly.  The pH is self-regulating in most cases. Bicarbonate of soda can be added to maintain a consistent pH; for example, when too much “green” or material high in nitrogen content is added.  It may be necessary to add water to the feed material if it is too dry or if the nitrogen content is very high.  A carbon/nitrogen ratio of 20/1 to 30/1 is best.  Occasional mixing or agitation of the digesting material can aid the digestion process.  Antibiotics in livestock feed have been known to kill the anaerobic bacteria in digesters.  Complete digestion, and retention times, depend on all of the above factors.


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