A device and method for removing ammonia nitrogen from anaerobic digestion fermentation broth

Abstract

The invention provides a device and a method for removing ammonia nitrogen in an anaerobic fermentation system. The device comprises a denitrification reaction tank, an ammonia collecting trap and a gas circulation system, wherein fermentation liquor is placed in the denitrification reaction tank; the gas circulation system comprises a gas pump, a gas flow meter, a gas bag and a gas pipe for connecting the whole passage; the ammonia collecting trap comprises a sealed container and an ammonia absorption solution placed in the sealed container; a gas extraction port of the gas pump extracts gas from the gas bag; the gas is sucked into the sealed container from a gas outlet of the gas pump; the ammonia absorption solution in the sealed container treats the gas and then enters the denitrification reaction tank; the gas is fed to the fermentation liquor placed in the denitrification reaction tank, is converged above the fermentation liquor and then is returned to the gas bag; ammonia brought out by the circulation gas when passing through the fermentation liquor is absorbed when passing through the ammonia absorption solution in the sealed container, so as to achieve the purpose of denitrification. The method provided by the invention has the advantages of accurate and reliable test results, easy operation and good repeatability; meanwhile, the device has the advantages of simple construction, low cost, simple structure, long service life and small occupied area.

Description

technical field [0001] The invention relates to a device and method for alleviating ammonia inhibition in the process of anaerobic fermentation of high-nitrogen raw materials, in particular to a device and method for removing ammonia nitrogen in anaerobic digestion fermentation liquid. Background technique [0002] The production of high-nitrogen raw materials such as livestock and poultry manure in my country has increased year by year, posing a serious threat to the environment. The anaerobic digestion process provides a harmless treatment method for such wastes, and can also generate clean energy at the same time, so it has become the preferred method for the treatment of high-nitrogen raw materials and has been widely used. However, studies have found that nitrogen-containing organic substances such as proteins, amino acids, urea, and amines in high-nitrogen raw materials generate ammonia nitrogen during the degradation process, resulting in the accumulation of ammonia, ...

AI Technical Summary

Problems solved by technology

[0004] At present, foreign studies have applied ammonia stripping technology to alleviate the phenomenon of ammonia inhibition in the process of anaerobic fermentation of high-nitrogen raw materials, and achieved good results, but domestic related research has rarely been reported.

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