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Biogas produced from cow dung, commonly referred to as "gobar gas" in some regions, is a renewable energy source that has been utilized for centuries, particularly in rural areas. Here's how the process generally works: Collection of Cow Dung: Cow dung, which is rich in organic matter, is collected from cattle farms or households. Anaerobic Digestion: The cow dung is then placed in a sealed container called a digester along with water. The digester can be made of concrete, plastic, or even under