Dry anaerobic fermentation process and device for reducing ammonia nitrogen accumulation

Abstract

The invention discloses a dry anaerobic fermentation process for reducing ammonia nitrogen accumulation. The dry anaerobic fermentation process is characterized by comprising the following steps of: detecting ammonia nitrogen concentration of fermentation liquor in a dry anaerobic fermentation reaction tank; when the ammonia nitrogen concentration of the fermentation liquor is less than a preset value, directly reflowing into the dry anaerobic fermentation reaction tank; and when the ammonia nitrogen concentration of the fermentation liquor reaches the preset value, removing ammonia nitrogen of the fermentation liquor through zeolite. The invention also discloses a device which is used for implementing the process. According to the dry anaerobic fermentation process and device, the suppression of the high-concentration ammonia nitrogen on the anaerobic fermentation reaction is reduced, the gas producing speed of the system is increased, and the replaced zeolite which adsorbs the high-concentration ammonia nitrogen can also be used as a soil conditioner.

Description

technical field [0001] The invention belongs to dry anaerobic fermentation technology, and mainly relates to a dry anaerobic fermentation technology for reducing ammonia nitrogen accumulation. [0002] The invention also relates to a device for carrying out the above process. Background technique [0003] Every year, a large amount of rural organic waste is produced in my country, such as livestock and poultry manure and straw, which are high-quality high-nitrogen and high-carbon biomass energy. The use of dry anaerobic fermentation technology can not only solve the problem of arbitrary discharge of livestock and poultry manure and straw incineration Environmental problems caused by improper treatment, etc., can also recover clean energy biogas in the process of processing agricultural waste, which can be used for heating, power generation, vehicle fuel, etc., to a certain extent, alleviating the pressure of my country's energy shortage. [0004] Due to the high solid conten...

AI Technical Summary

Problems solved by technology

However, the dry anaerobic fermentation reaction runs for a long time, and the ammonia nitrogen in the fermentation liquid produced by it will accumulate to a certain extent, and the ammonia nitrogen accumulated to a certain concentration will inhibit the activity of the methanogens in the reaction system, making it The metabolism slows down, and the utilization rate of organic matter and nutrients decreases, which leads to a decrease in the gas production rate of the system

For the long-term domesticated reaction system, the ammonia nitrogen concentration of 2000mg / L will reduce the activity of methanogens by 10%, and another report indicates that the gas production efficiency will decrease by 40% when the ammonia nitrogen concentration is around 5000mg / L

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