Method for cleanly producing glutamic acid, gamma-polyglutamic acid and organic fertilizer

Abstract

The invention provides a method for cleanly producing glutamic acid, gamma-polyglutamic acid and an organic fertilizer, relating to a method for sequentially preparing the glutamic acid, the gamma-polyglutamic acid and an organic slow-release fertilizer with functions of retaining water and humidity by adopting a microbiological fermentation method. According to the method provided by the invention, the gamma-polyglutamic acid is produced by using electric waste liquid such as the glutamic acid; the extraction rate of the glutamic acid is only 70-80 percent; the gamma-polyglutamic acid, a large amount of mycoprotein and the organic slow-release fertilizer with functions of retaining water and humidity, with higher added values, are simultaneously obtained; an extraction mother solution of the glutamic acid is simply adjusted to be used as a culture medium for producing the gamma-polyglutamic acid, so that a hybridization process is omitted and the discharge amount of waste water in the extraction process of the glutamic acid is reduced and zero discharge is basically realized; and the pressure of glutamic acid production enterprises on environment pollution is reduced and the aim of clean production is achieved.

Description

technical field [0001] The invention belongs to the technical field of amino acid production, and specifically relates to a method for sequentially preparing glutamic acid and gamma-polyglutamic acid and obtaining an organic slow-release fertilizer with water-retaining and moisturizing functions by adopting a microbial fermentation method. Background technique [0002] Domestic glutamic acid fermentation has problems such as low acid production, high energy consumption, and serious pollution. Usually, the isoelectric-isolation process is used to recover glutamic acid, although this process can make up for the yield of glutamic acid extracted by the single isoelectric method. The problem is low, but the side effects caused by separation are very large. According to statistics, only extracting glutamic acid in the high-flow liquid consumes nearly 1.2 tons of glutamic acid sulfuric acid and 0.6 tons of liquid ammonia, which is much higher than the glutamic acid in the fermentati...

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Problems solved by technology

[0002] Domestic glutamic acid fermentation has problems such as low acid production, high energy consumption, and serious pollution. Usually, the isoelectric-isolation process is used to recover glutamic acid, although this process can make up for the yield of glutamic acid extracted by the single isoelectric method. The problem is low, but the side effects caused by separation are very large. According to statistics, only extracting glutamic acid in the high-flow liquid consumes nearly 1.2 tons of glutamic acid sulfuric acid and 0.6 tons of liquid ammonia, which is much higher than the glutamic acid in the fermentation liquid. Extraction and consumption of amino acid, the separation wastewater produced by tons of glutamic acid is as high as 12m 3 In addition, during the continuous circulation of the high-flow liquid, the bacterial protein, metal ions, sulfate radicals and other impurities in the fermentation liquid are also continuously enriched, which makes the α-glutamic acid precipitated by isoelectric crystallization poor in quality and low in purity , separation and recovery of glutamic acid in the mother liquor, the overall economic benefit is very small, especially from the perspective of environmental protection, separation is not the best recovery process

At present, the vast majority of domestic enterprises use biochemical-physical chemical methods to treat terminal wastewater. They treat high-concentration organic wastewater such as glutamic acid or monosodium glutamate wastewater as "wastewater". High operating costs and low economic benefits often become a heavy burden on enterprises, which is unreasonable technically and economically, and is essentially a process in which resources are not rationally utilized.

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