Method for producing compound fertilizer by using fermentation glutamate extraction waste liquor

Abstract

The invention discloses a method for producing a compound fertilizer by using fermentation glutamate extraction waste liquor, comprising the following steps of: a, evaporating and concentrating the fermentation glutamate extraction waste liquor at a temperature of 40-150 DEG C so that the content of solid in condensed slurry reaches 40-99%; b, cooling the condensed slurry until the temperature reaches 20-120 DEG C; and c, pelleting, cooling, solidifying and shaping the materials obtained in the step b to obtain the compound fertilizer. The method can overcome the defects of poor environment-friendly property and low use ratio of recovery resources in the prior art, and has the advantages of good environment-friendly property, good product performance, wide applicability and high use ratio of recovery resources.

Description

technical field [0001] The invention relates to a treatment technology of amino acid fermentation waste liquid and a fertilizer production technology, in particular to a method for producing compound fertilizer by using fermentation glutamic acid to extract waste liquid. Background technique [0002] my country is a major producer of amino acids. According to statistics, the annual output of glutamic acid in my country is as high as 1.5 million tons. Generally, the production of glutamic acid mainly adopts the fermentation method, and the mature fermentation liquid obtained by fermentation contains about 10-15% glutamic acid. After extracting glutamic acid from the mature fermentation liquid, the remaining waste liquid is collectively referred to as Fermented glutamic acid extraction waste liquid. [0003] Among them, due to the different extraction processes for extracting glutamic acid from mature amino acid fermentation broth, the volume and concentration of fermentation...

AI Technical Summary

Problems solved by technology

[0005] For the above-mentioned fermentation glutamic acid extraction waste liquid, if it is discharged directly without treatment, it will cause great pollution to the environment and cause waste of resources

In addition, if it is processed, there are the following problems: (1) due to the fermentation of glutamic acid in the extraction waste liquid SO4 2- (2) If aerobic treatment is used, a large amount of clear water is required to dilute the organic matter with too high concentration, but even so, NH 3 -N index also can't reach environmental protection requirement; (3) if adopt incineration to handle, then cost is too high; (4) if adopt liquid fertilizer method to handle, will be because of large quantity, strong seasonality, storage and transportation difficulty and economic benefit Low difficulty, difficult to implement

[0010] (1) Poor environmental protection: In the technology of processing the waste liquid of fermentation glutamic acid extracted by the method of producing compound fertilizer by spraying granulation technology, when high-temperature flue gas is used for sintering and granulation treatment, the tail gas produced will cause secondary pollution to the atmosphere Secondary pollution, and, when excessive carbonization, the fertilizer produced will not decompose for several years in the field, causing pollution to the soil; in the technology with patent application number 200710114385.4, the hot air drying method used will still pollute the atmosphere ;

[0011] (2) The utilization rate of recycling resources is low: in the technology of processing the waste liquid of fermentation glutamic acid extracted by the method of producing compound fertilizer by spraying granulation technology, the high temperature process and equipment factors will cause the loss of fertilizer nutrients. When excessive carbonization, It cannot be dissolved after being applied to the field for several years, and the effect of fertilization cannot be achieved

Images