How does cow dung ferment and produce biogas?

Strict anaerobic environment. Biogas fermentation microorganisms include two major types of acid-producing bacteria and methanogens, all of which are anaerobic bacteria. Therefore, the construction of a gas-tight, air-tight closed biogas digester is the key to artificially producing methane from cow dung.

Have enough and fine inoculum. The inoculum of biogas digesters generally comes from the old biogas digesters (biogas slurry), sewer sludge, and sediments at the bottom of the pits. The amount of inoculum generally accounts for about 30% of the total cow manure fermentation broth.

The necessary fermentation temperature. Biogas fermentation strains can produce gas in the range of 8-60°C, and the higher the temperature, the more methane production and the best at 35°C. Therefore, as a cow manure digester fermented at room temperature, the temperature should be maintained at 8°C or more.

Appropriate pH. In the process of biogas fermentation, biogas bacteria are suitable for breeding in a neutral or slightly alkaline environment. The pH of the fermentation broth is controlled at 6.8-7.5.

Appropriate fermentation concentration and carbon-nitrogen ratio. The carbon and nitrogen content of cow dung is relatively high, and the ratio of carbon to nitrogen can be adjusted to 20 to 30:1 by a 4:1 ratio with human waste, and at the same time, a fermentation concentration of 6% to 10% should be satisfied. The carbon-nitrogen ratio and fermentation concentration may be appropriately lower in summer and higher in winter.

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