Solid-liquid two-phase anaerobic fermentation apparatus and method

Abstract

The invention relates to a solid-liquid two-phase anaerobic fermentation apparatus and method. The solid-liquid two-phase anaerobic fermentation apparatus comprises a solid-producing acid fermentation reactor, a liquid-producing methane reactor, an acid-producing fermentation liquor collecting tank, a biogas slurry collecting tank, a cyclic heating device, a methane meter, a blender, a sewage pump, a liquid level sensor, a temperature sensor and an automatic control cabinet. The solid-liquid two-phase anaerobic fermentation apparatus and method has the advantages that a liquid-phase fermentation device is small in size, fast in temperature rising, good in insulation and low in energy consumption; the apparatus is small in space occupation, low in investment, and about 20% of the investment can be saved as compared with traditional wet fermentation; the apparatus and method is suitable for recycling use of organic wastes of pig manure, straw, vegetable residues, kitchen wastes, municipal wastes and the like, and the apparatus and method is water saving, free of biogas slurry discharge, free of secondary pollution and the like, and substrate conversion rate and volume biogas production are high.

Description

technical field [0001] The invention belongs to the field of biogas fermentation, and relates to a solid-liquid two-stage anaerobic fermentation device and method. Background technique [0002] my country is the country with the largest amount of organic waste in the world. The annual output of crop straw reaches 770 million tons, and the discharge of livestock and poultry manure is about 2.5 billion tons, but the harmless treatment and resource utilization rate are extremely low. About 55.6% of the straw is directly burned or discarded at will, and more than 90% of the livestock and poultry manure is Untreated sewage is directly discharged into the surrounding environment, making "resources" a "pollution source", and it is imminent to curb straw burning and control livestock and poultry waste pollution. Anaerobic fermentation to produce biogas is an effective method for the above-mentioned agricultural organic waste treatment and resource utilization. way. [0003] There ...

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Problems solved by technology

[0004] At present, the most widely used method is wet anaerobic fermentation, which has the following disadvantages: 1. Serious waste of water resources, large amount of biogas slurry, easy to cause secondary pollution and other problems. Taking pig manure as an example, every 1 ton of fermented material liquid, will produce about 0.74 tons of biogas slurry, the follow-up treatment is difficult, basically directly discharged, and the pollution is serious; 2. In the wet single anaerobic fermentation device, acidogenic fermentation and methane fermentation are carried out in the same reactor, resulting in acidogenic fermentation 3. When wet anaerobic digestion technology is used, in order to improve the gas production efficiency, the generated biogas is often used as fuel to heat the huge fermentation device, and the internal consumption of biogas is large, which reduces the Economic benefits; 4. In the process of fermenting organic waste such as crop stalks and livestock manure to produce biogas, problems such as difficulty in feeding and discharging materials, floating and crusting are very serious

[0005] The dry fermentation process is generally batch fermentation, and the gas production is unstable, which affects the subsequent utilization of biogas; the organic matter load is high during the fermentation process, and the rate of hydrolysis acid production and acidification (acidification fermentation) and methane production rate are quite different, which is easy to produce acid accumulation, inhibiting methanogenic fermentation; organic matter degradation rate and biogas conversion rate are low

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