Degerming method for recycling somatic cells from amino acid zymotic fluid/extraction waste liquid

Abstract

The invention relates to a degerming method for recycling somatic cells from amino acid zymotic fluid / extraction waste liquid. The method is characterized by comprising the following steps: the amino acid zymotic fluid or the extraction waste liquid flows into a heat exchanger to exchange heat with zymotic fluid or extraction waste liquid from a maintenance tank; the zymotic fluid or the extraction waste liquid after heat exchange flows into a heater to heat and then exchanges heat with low-temperature raw liquid for cooling; the amino acid zymotic fluid or the extraction waste liquid after the heat exchange enters a storage tank and is injected into an ejector; air is sucked in and beaten into small bubbles by a pump impeller; and afterwards, a flocculating agent is added to a mixer so that the somatic cells are agglomerated into groups which enter an air-bearing tank after flocculation; the flocculent groups absorbing the small bubbles have low specific gravity, automatically float upwards to the top of the tank and overflow to a somatic cell collecting tank; clear zymotic fluid or extraction waste liquid after degerming flows out from one side of the air-bearing tank; the somatic cells overflowing to the collecting tank are filtered by a filter, and obtained clear liquid and clear liquid flowing out of the air-bearing tank are mixed.

Description

technical field [0001] The invention relates to a method for removing bacteria from amino acid fermentation liquid / extraction waste liquid, specifically, it mainly refers to recovering bacteria from amino acid fermentation liquid such as glutamic acid and lysine or waste liquid after amino acid extraction. A somatic cell belongs to the technical field of fermented food industry. Background technique [0002] my country is a major producer of amino acids. In 2007, the domestic annual output of glutamic acid reached 1.5 million tons and lysine 750,000 tons. In addition, there are a large number of small varieties of amino acids such as threonine, tryptophan, and arginine. In various amino acid fermentation liquids, generally 1.0-10.0% of bacterial cells are contained, which brings certain difficulties to the extraction work, resulting in a decline in the extraction yield and purity of the product. Removing bacterial cells from the fermentation broth can not only create good c...

AI Technical Summary

Problems solved by technology

However, simply adding flocculant, the removal rate of bacterial cells is low, and the water-soluble protein in the fermentation liquid or extraction waste liquid cannot be removed. In addition, the amount of flocculant is large, generally up to 300mg / L, and the treatment cost is high.

Moreover, the filtration after bacterial cell flocculation is still relatively difficult, and the moisture content of the filter residue is high, which not only increases the product loss, but also increases the energy consumption of the subsequent filter residue drying

[0008] For a long time, in order to speed up the filtration rate of flocculated bacterial cells, diatomite, sawdust, sugarcane pith and other filter aids were mainly added to the fermentation broth or extraction waste liquid, which achieved good results, but after adding filter aids , the protein content of the filter residue is reduced, and the potency as a feed is reduced

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