| 摘要 |
PURPOSE:To decrease the consumption of water, by treating the fermentation liquid or an intermediate treatment liquid with a semipermeable membrane prior to the ion exchange resin treatment. CONSTITUTION:The intermediate treatment liquid is a basic amino acid solution obtained from various steps in the separation of the objective amino acid from a fermentation liquid, and contains polymeric impurities such as microbial cells, humus, pigments, etc. The semipermeable membrane passes the basic amino acid and inhibits the permeation of the polymeric impurities. It is preferable to control the pH of the basic amino acid fermentation liquid or intermediate treatment liquid to 2-5 prior to the treatment with the semipermeable membrane. The polymeric impurities are coagulated by the pH adjustment to increase the rejection of the impurities in the semipermeable membrane treatment process and to increase the rate of permeation. The liquid passed through the semipermeable membrane is made to contact with a strongly acidic cation exchange resin. The water consumption can be decreased by this process.
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