Benefits of Anaerobic Digestion
In an anaerobic digester, animal wastes are degenerated to organic manure and biogas is produced which is about 60% methane (natural gas) and 40% carbon dioxide. Methane from the biogas gas is separated from the co2 and burned as an energy source. Biogas is a more environmentally friendly alternative to using gas or coal as an energy source.
The largest anthropogenic sources of Methane are landfills. Methane is a greenhouse gas 21x times more powerful than CO2. Anaerobically digesting manure, food waste and yard scraps prevents these materials from being sent to landfills; and the resultant biogas from anaerobic digestion can be harvested over a matter of days as opposed to years.
Anaerobic Digestion plants require less physical space than aerobic composting facilities as well as landfills.
When manure, food waste, or sewage is anaerobically digested rather than transported a great distance to a landfill, the associated transportation emissions as well as the production of leachate in the landfill are reduced.
Another byproduct of the anaerobic digestion process is acidogenic digestate. This compost like byproduct is a valuable soil amendment that, when added to soil, can improve plant growth, alleviate soil compaction, reduce soil erosion, nutrient run-off and help soil retain water.
Using the digestate can also reduce the need for chemical fertilizers. Not using chemical fertilizers further reduces greenhouse gas emissions, which are emitted during the chemical fertilizer manufacturing process.
Dairy farms emit large quantities of Greenhouse gas. The digestive system of animals produces considerable amounts of methane. In many countries, anaerobic digesters or biogas plants are used to control methane emission from animal excreta.
Anaerobic digesters do have environmental impacts. In an anaerobic digester, animal waste is degenerated to organic manure while a mixture of methane and carbon dioxide is released. Methane from the biogas gas is separated from the co2 and burned as an energy source and co2 is usually emitted into the atmosphere. Burning methane again also produces carbon dioxide contributing to air pollution.
Anaerobic digesters cause water pollution. During processing, the organic waste mixture is diluted with water to reach 1% to 10% solids level. The water used for this process now is contaminated and its reuse is limited to fertilizer.
Sustainability for Anaerobic Digesters and Diary Farms
Algaecake technologies Corporation offers sustainability to dairy farms and anaerobic digesters. Water from the anaerobic digester is rich in nutrients that can be used grow algae in our photo bioreactor farm. After processing through our photo bioreactors the water quality is significantly improved and recyclable.
"Adding an anaerobic digester and algae farm to a dairy farm will create multiple income streams and convert the farm to a role model of sustainability"
The biogas emissions from and anaerobic digester are about 60% methane (natural gas) and 40% carbon dioxide. When these emissions are processed through our photo bioreactor system 95% of the carbon from the co2 is consumed by algae during photosynthesis and oxygen is released creating an oxygen rich (higher quality) methane gas.
Methane from the plant is burnt to generate various forms of power. This is usually the only source of power for an anaerobic digester. Carbon dioxide released from burning methane can be recycled through the algae farm to biomass.