Efficient anaerobic dry fermentation system for organic matter waste

Abstract

The invention relates to an efficient anaerobic dry fermentation system for organic matter waste. The efficient anaerobic dry fermentation system comprises a micro-aerobic hydrolysis acidifier, an intermediate reactor and an anaerobic dry fermenter. The micro-aerobic hydrolysis acidifier comprises a first reaction tank, and an aeration pipe and a first discharge port are arranged at the bottom of the first reaction tank; the intermediate reactor comprises a second reaction tank and a crushing stirrer, the second reaction tank is communicated with the first discharge hole, and a second discharge hole is formed in the bottom of the second reaction tank; the anaerobic dry fermenter comprises a third reaction tank and a spiral propelling stirrer; and the third reaction tank is communicated with the second discharge hole. The bottom of the third reaction tank is provided with a plurality of fermentation liquor guide-out ports, each fermentation liquor guide-out port is provided with a filter screen and a valve, the fermentation liquor guide-out ports are connected with a liquor storage tank, the liquor storage tank is connected with a vacuum tank, and the fermentation liquor generated by anaerobic fermentation is intermittently pumped (pumped while stirring) into the liquor storage tank through negative pressure for further fermentation. Anaerobic fermentation decomposers are rapidly migrated out through negative pressure suction, and the situation that the activity of anaerobic bacteria is inhibited due to accumulation is avoided.

Description

technical field [0001] The invention relates to the technical field of organic waste fermentation, in particular to an efficient anaerobic dry fermentation system for organic waste. Background technique [0002] With the improvement of the level of industrial and agricultural intensification, the distribution of organic waste generated is relatively concentrated and needs to be reduced. Anaerobic fermentation is an effective way to treat organic waste, and it is an effective way to realize waste resource utilization and energy utilization. In the process of anaerobic fermentation, organic matter is decomposed by microorganisms to produce clean energy-biogas, which realizes the resource utilization and energy utilization of organic waste. Anaerobic fermentation has become an important link in the development model of circular economy. Anaerobic dry fermentation, also known as solid anaerobic fermentation, uses solid organic waste such as straw, domestic garbage, and livestoc...

AI Technical Summary

Problems solved by technology

Although the current dry fermentation reactor can handle high-concentration fermented products, due to mass transfer difficulties and uneven stirring, large-scale acidification during the fermentation process results in less biogas production, uneven gas production, and low gas production rate, etc. question

Although stirring technology can solve the mass transfer difficulties caused by the inability of microorganisms and degradable organic matter to actually contact, as well as the uneven physical, chemical and biological properties of materials, etc., there are still many difficulties in the actual use of anaerobic dry fermentation , mainly including: low water content of the substrate in dry fermentation, difficulty in stirring, the migration and diffusion speed of microbial cells and reaction intermediates (mainly volatile organic acids VFA) in the fermentation substrate are severely restricted, and local VFA in the fermentation substrate Excessive accumulation, thereby inhibiting the growth of methanogens, leading to instability or even failure of the fermentation process

Secondly, the heat and mass transfer in the anaerobic process is uneven, which makes the efficiency of anaerobic dry fermentation very low (some of the fermented products have been fully fermented and some have not yet started to ferment)

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