Anaerobic digestion is an effective way to covert the animal manure in to profitable byproducts as well as reduce the pollution of water, air and soil caused by these wastes. Dry anaerobic digestion has been considered as suitable process for potential renewable energy, recovery with nutrient rich fertilizer and sustainable solid waste management. It saves the water and can be done in less space as compare to the wet anaerobic digestion which requires the large space for drying the effluent manure and it also requires the large amount of water during feeding. During the process of dry anaerobic digestion 150L water is required in comparison with wet anaerobic digestion where 2500 Liters water is required for the same amount of production of biogas production. Dry solid consistency is 12.5 - 15%. Dry anaerobic digestion helps in improving ground water as well as wet digestion process requires drying in pits that results in leach out soil and increase its contamination. The digested cow manure in dry stage shall contain rich nutrients and removed in mechanized way and would be ready for use in field without dewatering. While wet anaerobic process requires more space, time and difficulty in handling digested cow manure in slurry form.
Dry Anaerobic Digestion, Cow Dung, Biogas