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Anaerobic Digestion ANAEROBIC DIGESTION AND BIOGAS TECHNOLOGY A contribution to Environmental Protection and the Conservation of Natural Resources 1. Fundamentals
_ APPENDICES: A. Primer on Anaerobic Digestion of Dairy Wastes ?.32 B. Map of Dairy Operations in the St. Albans/Swanton area of Vermont?.33 C. Census of Select Farms
decomposition of organic compounds that make up the waste. This process is known as anaerobic fermentation or digestion. The types of bacteria that perform most of
"seed" to help the bacteria in the aeration tanks. The rest of the sludge is pumped into anaerobic digestion tanks. Then anaerobic bacteria get rid of the sludge,
de acuerdo al tema: -Bioprocesos: SUNG, T., MARTIN, A., Thermodynamic equilibrium model in anaerobic digestion process, Biochemical Engineering Journal, Vol. 34,
Submitted by jarid85 on June 22, 2008
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ANAEROBIC DIGESTION AND BIOGAS
TECHNOLOGY
A contribution to Environmental Protection and
the Conservation of Natural Resources
1. Fundamentals
The main principle of anaerobic digestion technology is to feed biomass, including in particular waste materials and by-products (agricultural wastes; kitchen scraps; feaces; organic wastes) into a closed container, the biodigester. In the absence of oxygen, this digestion material is converted into high-value fertiliser humus, and pathogenic germs are eliminated at the same time. The bacteria involved in this process produce a biogas mixture composed of 35% carbon dioxide and 65% methane. Biogas can be used as an alternative source of energy in many ways. The whole system works without any external energy input.
2. Areas of use
For a very long time, biogas units used to be regarded only as sources of energy for cooking, baking, and lighting.
However, due to the fact that it is capable of converting waste material into germ -free fertiliser, anaerobic digestion technology is really predestined to being used also in the treatment und clarification of waste water, in the field of sanitation in general and in particular in the treatment of organic waste from households, hospitals, and agricultural production including abattoirs.
These aspects of using anaerobic digestion or fermentation technology for reasons of hygiene and environmental health have become increasingly relevant and popular in recent years.
2.1 Thus, anaerobic and biogas systems have been very seccessfull in environment-friendly sewage
disposal from hospitals and other community facilities.
Before reaching the biodigester, the waste water is separated mechanically / hydraulically from the solid matter, and runs into a clarification pond or over a reed bed for treatment. The anaerobic process is already...
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