Process for producing biological fermented (organic-inorganic compound mixed) fertilizer from glutaminic acid fermenting waste liquid

Abstract

The waste fermented liquid from glutamic acid production contains great amount of thallus, intermediate fermenting products and trace elements. The present invention provides the technological process of producing fermented fertilizer as one kind of organic-inorganic composite fertilizer with the waste fermented liquid from glutamic acid production. The technological process includes the steps of evaporating concentration, extracting ammonium sulfate, stirring mixing, drum pelletizing and stoving. The present invention has high economic benefit and environment benefit.

Description

technical field [0001] The invention belongs to the technical field of amino acid fermentation, and relates to industries related to glutamic acid fermentation waste liquid treatment and fertilizer production. Background technique [0002] At present, most glutamic acid fermentation enterprises produce glutamic acid through biological fermentation, and react with sodium hydroxide to form sodium glutamate (monosodium glutamate). The main process flow is: starch→glucose→(fermentation)→glutamic acid→(refining)→sodium glutamate. Extract glutamic acid from the fermentation broth to become fermentation waste liquid, which contains a large amount of bacteria, various fermentation intermediate products and trace elements. After the bacterial protein is extracted from the fermentation waste liquid, the pH of the solution is between 1.7 and 3.5, the concentration of CODcr is about 20000mg / L, and the concentration of NH 3 -N concentration is about 8000mg / L, SO 4 2- The concentratio...

AI Technical Summary

Problems solved by technology

However, in the process of evaporating a large amount of water vapor, the organic matter in the fermentation liquid is also volatilized under high temperature conditions, forming smoke that is difficult to diffuse, causing serious secondary pollution of the air

Under the pressure of today's environmental protection requirements, this pollution has seriously restricted the development of glutamic acid factories

[0007] 2. Fertilizers are not easy to meet the standards

The fertilizer industry has national standards, and the biofermentation (organic-inorganic compound) fertilizer formed by spray granulation is difficult to meet the requirements of the fertilizer industry standards

[0009] 3. High energy consumption

[0011] 4. Large equipment investment

[0013] Due to the shortcomings of the spray granulation process, especially the secondary pollution of flue gas, the development of glutamic acid fermentation plants has been severely restricted, and some plants have been forced to limit or stop production.

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