The invention relates to a device and a method for producing
marsh gas by vinegar residue
solid and liquid split-phase
anaerobic digestion, and belongs to the technical field of biological fermenting. The device mainly comprises a
solid-state fermenting tank, a high-temperature boiler, a filler reactor, a
marsh gas purifier, a
solid and liquid separator, and a
water storage tank. The invention also discloses a method using the device to produce
marsh gas by the vinegar residue solid and liquid split-phase
anaerobic digestion. The method mainly comprises the following steps of (1) spraying and washing vinegar residue by water in the solid-state fermenting tank; (2) performing high-temperature
hydrothermal treatment on the filtered water-washing vinegar residue; (3) performing medium-temperature vinegar residue
fermentation on
water washing liquid; (4) performing high-temperature solid-state
fermentation; (5) purifying and utilizing the
marsh gas. The device and the method have the characteristics that the vinegar residue solid and liquid split-phase
anaerobic digestion is realized, the content of
organic acid in the vinegar residue is high, the
water washing and separation are easy, and the like; in the fermenting process, the adding of other raw materials is not needed, the
hydrothermal circulation is realized, the cost is reduced, the traditional vinegar residue anaerobic
digestion is broken, and the production capacity of
marsh gas is increased.