System and method for utilizing biogas slurry and straw hydrolysate to prepare amino acid and separate CO2

Abstract

The invention discloses a system and a method for utilizing biogas slurry and straw hydrolysate to prepare an amino acid and separate CO2. In the system and the method, the straw hydrolysate and the biogas slurry are utilized for candida fermentation, a composite amino acid is obtained after yeast hydrolysis, the composite amino acid is neutralized through KOH to generate a composite amino acid salt which is relatively low in cost, the composite amino acid salt is applied to CO2 absorption and separation, and an amino acid salt solution rich in CO2 and the biogas slurry after fermentation are mixed according to a certain proportion to be applied to agricultural production. By the system and the method, the defect that conventional chemical absorbents are large in degradation loss and high regeneration energy consumption is avoided effectively, most ammonia nitrogen in the biogas slurry is removed, nutritional ingredient content in the biogas slurry is increased, the biogas slurry is enabled to be easier to treat and use, and win-win effect in the aspects of energy resource and environment is realized.

Description

technical field [0001] The invention relates to biogas engineering and CO 2 The technical field of absorption and separation integration, specifically refers to a method of preparing amino acids from biogas slurry and straw hydrolyzate and separating CO 2 systems and methods. technical background [0002] At present, biogas, landfill gas and biomass pyrolysis gas are rich in CO 2 CO in gas 2 Separation technologies mainly include chemical absorption method, physical adsorption method, membrane separation technology, etc. Among them, chemical absorption method is the most mature technology and the most widely used in engineering. CO 2 The chemical absorption method has CO 2 It has the advantages of high separation efficiency and less target gas loss during the separation process. Such as the separation of CO in biogas 2 CH 4 As the target gas, it has the advantages of wide adaptability to gas partial pressure, simple operation and wide commercial application, and is o...

AI Technical Summary

Problems solved by technology

Biogas slurry is a waste liquid with high ammonia nitrogen and high COD (Chemical Oxygen Demand, chemical oxygen demand) produced during the biogas fermentation process. Although it can be used as fertilizer to irrigate crops, a large amount of excess biogas slurry has become a waste that is difficult to treat. Easy to cause secondary pollution to the environment

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