Lysine is a white or nearly white free-flowing crystalline powder, one of the essential amino acids for human metabolism, which can promote human development, enhance immune function, and improve the function of central nervous system tissue. The human body can not synthesize L-lysine on its own, must be drawn from food, the human body only supplemented with enough L-lysine to improve the absorption and utilization of food protein, to achieve balanced nutrition, promote growth and development. Industrial production of L-lysine is mostly feed grade lysine, white or light yellow granules, the main forms are L-lysine hydrochloride and L-lysine sulfate, often used as food and feed additives, medicine.
First, the production equipment and process technology characteristics
(01) Brief description of production equipment
The supporting design of the 40,000 tons per year lysine hydrochloride plant includes: a pretreatment workshop with an annual processing capacity of 120,000 tons of corn, a power workshop, a fermentation workshop, an extraction workshop and a wastewater treatment workshop. Among them, the wastewater treatment workshop includes a dilute wastewater treatment workshop and a concentrated wastewater treatment workshop.
(2) Process technology characteristics
Using corn as raw material, using a series of advanced process technology and production equipment such as double enzyme sugar, membrane filtration, secosius dissociation, etc., to produce high-quality lysine products and high value-added feed products. Comprehensive utilization of wastewater generated in production to achieve zero discharge of wastewater from the production process.
(3) Key production processes and their treatment
(1) Corn soaking
The purpose is to destroy and weaken the connections between the components of the corn kernel, disperse the protein network in the endosperm cells, and separate the starch and non-starch parts. At the same time, the soluble substances in the corn kernels are dissolved, the harmful activities of microorganisms in the corn are inhibited, the material corruption in the production process is prevented, and the mechanical strength of the corn kernels is reduced to facilitate separation. Corn and water are pumped into the soaking tank by the conveyor pump in a ratio of 1:3, and the soaking generally adopts a semi-continuous process. The soaking temperature is controlled at 48-52 °C, the concentration of sulfite soaked is controlled at 0.25-0.30%, and the soaking time is 48-72h. Dilute wastewater is produced every day about 200m, and dilute corn syrup is about 170m. Dilute wastewater is transported to environmental protection treatment plants for anaerobic and oxygen-consuming treatment, and finally discharged to urban sewage treatment plants. Corn syrup is concentrated and dried to improve the yield of by-products.
(2) Membrane filtration
The essence of the membrane separation process is the process of the material passing through or being trapped in the membrane, similar to the screening process, according to the size of the membrane pore size and the purpose of material separation. The high-pressure pump forms a high pressure to generate pressure, and the macromolecular particles are intercepted through membrane tubes of different pore sizes (0.1um, 0.2um), and the small molecular particles pass through the membrane to separate the substances in the solution. Fermentation broth residues are produced daily for about 300 m, which is mainly used for the production of lysine high-protein feeds or the production of hexapentasine sulfate. Dilute wastewater is generated in the cleaning process of ceramic membrane, about 400m per day, and this part of the wastewater is transported to the dilute wastewater environmental protection treatment workshop for treatment.
(3) Sekosais disengagement
IONRESIN ion exchange system, lysine ions are adsorbed, and the lysine ions in it are adsorbed by the special resin of Chromases, and at the same time separated from other impurities, adsorbing the separated wastewater and impurities discharged from the cylinder. Adsorb the saturated column and then enter the elution backfill area, improve the purity of the eluate by backfilling the wastewater and impurities in the hydraulic column, the column after the elution backfill continues to enter the elution zone, and then use a certain concentration of ammonia to eliminate acidity, elute the lysine ions from the resin, and regenerate the resin. The regeneration column enters the regeneration zone after the dilute sulfuric acid transformation achieves the best adsorption capacity in the adsorption zone, and the ion exchange column is in different areas at the fixed end, so that the ion exchange column carries out different reaction processes. About 700m of high-ammonia nitrogen wastewater is generated every day, and this part of the wastewater is transported to the concentrated wastewater treatment workshop for treatment.
Second, wastewater treatment equipment
Dilute wastewater treatment plant, mainly treating dilute wastewater produced in the process of lysine production, with a daily treatment capacity of 5000-6000m. The device takes the wastewater of each branch plant in the amino acid production area as raw material, and the wastewater containing high ammonia nitrogen in the wastewater is stored centrally, and the free ammonia nitrogen in the water is released after blowing off treatment, so as to achieve the removal effect of the wastewater ammonia nitrogen, and then supply the anaerobic system for further treatment. Other wastewater through pretreatment to remove solids, floating matter in the water, to achieve balanced water quality, adjust the PH value, water temperature, and then through anaerobic fermentation, anaerobic reactor effluent COD removal rate should be greater than 80, a day to produce biogas about 40,000 cubic meters (about 40 tons of standard coal), biogas can be used for lithium bromide refrigeration, boilers and canteens and other units, excess gas into the burner combustion. After anaerobic treatment, the wastewater is transported to the oxygen consumption system for further treatment, and finally the wastewater is filtered by the sludge press, and the sludge is used as fertilizer after pressing, and the wastewater is transported to the urban sewage treatment plant after pressing. Concentrated wastewater treatment device, using the non-ferrous process wastewater of Selcos as raw materials, using a series of process technologies and production equipment such as concentration, crystallization and centrifugation, to produce ammonium sulfate products. Part of the ammonium sulfate finished material, fine filter for lysine fermentation, the excess part of the external sales. For more information, contact sewage treasure or see
From corn cultivation to industrial production, lysine products are supplied
In demand, waste is processed into fertilizer and returned to farmland. The production process of the product forms a closed circle. In addition, the treatment, reuse, conservation and industrial chain of various wastes are "integrated", and then superimposed into a circle, and the development mode of "circular economy" is initially formed in production. With the gradual emergence of resource problems, lysine product manufacturers must integrate the development of enterprises with the "circular economy", increase investment in environmental protection, improve management, strive to reduce and control pollution from the source, and comprehensively utilize or recycle the waste, waste water and waste heat and residual gas generated in production, so as to "eat dry and squeeze out" the production raw materials, and make outstanding contributions to the development of the circular economy.