Device and method for producing marsh gas by vinegar residue solid and liquid split-phase anaerobic digestion

Abstract

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.

Description

technical field [0001] The invention relates to waste biofermentation technology, in particular to a device and method for anaerobic digestion of vinegar lees solid-liquid phase separation to produce biogas, belonging to the field of biofermentation technology. Background technique [0002] Vinegar grains are organic wastes discharged during the production of vinegar using grain raw materials. In recent years, with the vigorous development of the national vinegar industry, the annual production and discharge of vinegar grains has reached 3 million tons, which is highly acidic (the content of acetic acid is 36000mg / kg ), high crude cellulose content (25.78% (dry basis)), low crude protein content (12.79% (dry basis)), difficult to decompose and so on. The above characteristics lead to some problems in the current treatment methods of vinegar grains. For example, a small part of vinegar grains is used as animal feed and edible fungus cultivation material, and the drying cost a...

AI Technical Summary

Problems solved by technology

Anaerobic digestion includes 4 processes: extracellular hydrolysis, acid production, acetogenic production and methanogenic production. Traditional single-phase anaerobic digestion can only handle low concentration of fermentation raw materials (less than 20%), and the residue of vinegar grains is not easy to Decomposition and rich acetic acid content, single-phase anaerobic digestion methane production process in a single reactor is likely to cause crusting and floating of vinegar grains, and the system is easy to acidify, resulting in low stability and gas production efficiency of vinegar grains biogas fermentation

[0004] Vinegar grains raw materials are raw materials with high organic acid content, and the methanogenic process of the entire anaerobic digestion process is the rate-limiting step, which leads to organic acid inhibition and long lag period when vinegar grains are subjected to single-phase continuous anaerobic digestion treatment

To avoid organic acid inhibition, conventional single-phase anaerobic digestion can only be run at lower loads with lower yields

Images