Resin regeneration wastewater treatment system in inositol production

Abstract

The utility model relates to the technical field of inositol production, in particular to a resin regeneration wastewater treatment system in inositol production, which comprises a neutralization tank, a first filtering device, a precipitate storage tank, a first resin column group, a second resin column group, an inositol purified liquid storage tank and a regeneration reagent conveying pipeline, a liquid outlet of the first resin column group is respectively communicated with a first regenerated concentrated liquid and washing liquid storage tank, and a liquid outlet of the second resin column group is respectively communicated with a second regenerated concentrated liquid and washing liquid storage tank; the first regenerated concentrated liquid storage tank and the second regenerated concentrated liquid storage tank are respectively communicated with the first mixing tank, the second filtering device, the nanofiltration membrane equipment, the first storage tank and the second storage tank; outlets of the first regeneration washing liquid storage tank and the second regeneration washing liquid storage tank are respectively communicated with a second mixing tank, a third filtering device, reverse osmosis equipment, a third storage tank and a fourth storage tank; a liquid outlet of the fourth storage tank is communicated with a resin regeneration water pipeline. By means of the wastewater treatment system, the wastewater discharge amount is greatly reduced, and recycling of pollutants is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of inositol production, in particular to a resin regeneration wastewater treatment system in inositol production. Background Art

[0002] In recent years, the production of inositol using potassium phytate as a raw material has gradually become popular. Compared with traditional processes, its by-product potassium dihydrogen phosphate has a wide range of uses, high added value, and better economic benefits. Its production process generally includes hydrolysis, filtration, simulated moving bed chromatography separation, concentration, crude product crystallization, decolorization, recrystallization, centrifugation, drying and other processes. Although the by-product potassium dihydrogen phosphate has high value, due to its high solubility in water, the hydrolysis rate of potassium phytate is slightly lower than that of calcium phytate. During the simulated moving bed chromatography separation of the potassium phytate hydrolysis solution, some incompletely hydrolyzed potassium phytate, potassium dihydrogen phosphate and amino acids remain in the inositol solution, affecting the inositol crystallization yield and product quality. Using ion exchange resin can effectively remove the above-mentioned impurities remaining in the inositol solution, and has the characteristics of high removal efficiency and low operating cost.

[0003] After the anion and cation resins are used, they need to be regenerated with acid or alkali respectively before they can be used again. The wastewater generated during the regeneration process contains high concentrations of substances such as chlorine and phosphorus. In particular, the phosphorus element has a greater impact on the environmental water body and is also difficult to treat by biochemical methods. Therefore, in view of the above problems, it is necessary to develop a resin regeneration wastewater treatment system in inositol production. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: aiming at the deficiencies of the prior art, to provide a resin regeneration wastewater treatment system in inositol production. By using this wastewater treatment system, the wastewater discharge is greatly reduced, and the recycling of pollutants is realized.

[0005] To solve the above technical problems, the technical solution of the utility model is:

[0006] A treatment system for resin regeneration wastewater in inositol production, comprising a neutralization tank connected to an inositol feed liquid conveying pipeline. The discharge port of the neutralization tank is connected to a first filtration device. The discharge port of the first filtration device is connected to a sediment storage tank. The liquid outlet of the first filtration device is respectively connected to a first resin column group and a second resin column group. The liquid outlets of the first resin column group and the second resin column group are respectively connected to an inositol purified liquid storage tank. The liquid inlets of the first resin column group and the second resin column group are respectively connected to a regeneration reagent conveying pipeline. The liquid outlet of the first resin column group is respectively connected to a first regeneration concentrated liquid storage tank and a first regeneration washing liquid storage tank. The liquid outlet of the second resin column group is respectively connected to a second regeneration concentrated liquid storage tank and a second regeneration washing liquid storage tank. The outlets of the first regeneration concentrated liquid storage tank and the second regeneration concentrated liquid storage tank are respectively connected to a first mixing tank. The outlets of the first regeneration washing liquid storage tank and the second regeneration washing liquid storage tank are respectively connected to a second mixing tank. The outlet of the first mixing tank is connected to a second filtration device. The liquid outlet of the second filtration device is connected to a nanofiltration membrane device. The retentate outlet and the permeate outlet of the nanofiltration membrane device are respectively connected to a first storage tank and a second storage tank. The outlet of the second mixing tank is connected to a third filtration device. The liquid outlet of the third filtration device is connected to a reverse osmosis device. The retentate outlet and the permeate outlet of the reverse osmosis device are respectively connected to a third storage tank and a fourth storage tank. The liquid outlet of the fourth storage tank is connected to a resin regeneration water pipeline.

[0007] As an improved technical solution, the first filtration device is a plate and frame filter press, and the second filtration device and the third filtration device are both precision filters with a filter element pore size of 0.5 - 1 micron.

[0008] As an improved technical solution, the first resin column group and the second resin column group respectively include a cation resin column and an anion resin column. The liquid inlet of the cation resin column is connected to the liquid outlet of the first filtration device. The liquid outlet of the anion resin column is connected to the inositol purified liquid storage tank.

[0009] As an improved technical solution, the regeneration reagent conveying pipeline includes a hydrochloric acid conveying pipeline and a purified water conveying pipeline connected to the liquid inlet of the cation resin column, and a potassium hydroxide solution conveying pipeline and a purified water conveying pipeline connected to the liquid inlet of the anion resin column.

[0010] As an improved technical solution, the liquid outlet of the cation resin column is connected to the first regeneration concentrated liquid storage tank and the first regeneration washing liquid storage tank. The liquid outlet of the anion resin column is connected to the second regeneration concentrated liquid storage tank and the second regeneration washing liquid storage tank.

[0011] After adopting the above technical solutions, the beneficial effects of the present utility model are:

[0012] Since the resin regeneration wastewater treatment system in inositol production includes a neutralization tank connected to the inositol feed liquid pipeline, the discharge port of the neutralization tank is connected to a first filtration device, the discharge port of the first filtration device is connected to a sediment storage tank, the liquid outlet of the first filtration device is respectively connected to a first resin column group and a second resin column group, and the liquid outlets of the first resin column group and the second resin column group are respectively connected to an inositol purified liquid storage tank; the liquid inlets of the first resin column group and the second resin column group are respectively connected to a regeneration reagent delivery pipeline, the liquid outlets of the first resin column group are respectively connected to a first regeneration concentrated liquid storage tank and a first regeneration washing liquid storage tank, and the liquid outlets of the second resin column group are respectively connected to a second regeneration concentrated liquid storage tank and a second regeneration washing liquid storage tank; the discharge ports of the first regeneration concentrated liquid storage tank and the second regeneration concentrated liquid storage tank are respectively connected to a first mixing tank, the outlets of the first regeneration washing liquid storage tank and the second regeneration washing liquid storage tank are respectively connected to a second mixing tank, the outlet of the first mixing tank is connected to a second filtration device, the liquid outlet of the second filtration device is connected to a nanofiltration membrane device, and the retentate outlet and the permeate outlet of the nanofiltration membrane device are respectively connected to a first storage tank and a second storage tank; the outlet of the second mixing tank is connected to a third filtration device, the liquid outlet of the third filtration device is connected to a reverse osmosis device, and the retentate outlet and the permeate outlet of the reverse osmosis device are respectively connected to a third storage tank and a fourth storage tank, and the outlet of the fourth storage tank is connected to a resin regeneration water pipeline. The inositol solution separated by the simulated moving bed system enters the neutralization tank along the inositol feed liquid pipeline, the feed liquid after neutralization reaction with the neutralizing agent enters the inside of the first filtration device, the sediment is collected by the sediment storage tank, and the filtrate enters the first resin column group or the second resin column group for desalting treatment. When entering the first resin column group for desalting treatment, the filtrate first enters the cation resin column and then enters the anion resin column, and the effluent is stored in the inositol purified liquid storage tank; the cation resin column and the anion resin column in the second resin column group are regenerated with the regeneration reagent. The regeneration concentrated liquid and the regeneration washing liquid during the regeneration treatment of the cation resin column are respectively stored in the first regeneration concentrated liquid storage tank and the first regeneration washing liquid storage tank, and the regeneration concentrated liquid and the regeneration washing liquid during the regeneration treatment of the anion resin column are respectively stored in the second regeneration concentrated liquid storage tank and the second regeneration washing liquid storage tank; then the regeneration concentrated liquids in the first regeneration concentrated liquid storage tank and the second regeneration concentrated liquid storage tank enter the first mixing tank for mixing, and after being filtered by the second filtration device and processed by the nanofiltration membrane device, the retentate and the permeate are respectively collected by the first storage tank and the second storage tank (the potassium chloride solution is concentrated, cooled, crystallized, centrifuged, and dried to obtain potassium chloride products); the regeneration washing liquids in the first regeneration washing liquid storage tank and the second regeneration washing liquid storage tank enter the second mixing tank for mixing, and after being filtered by the third filtration device and processed by the reverse osmosis membrane device, the retentate (which can be mixed with the retentate in the first storage tank, concentrated, and dried as a feed additive component) and the permeate (used as resin regeneration water) are respectively collected by the third storage tank and the fourth storage tank.

[0013] Since the first filtration device is a plate and frame filter press; the second and third filtration devices are both precision filters with a filter element pore size of 0.5 - 1 micron. The sediment and filtrate can be effectively separated by the plate and frame filter press; the insoluble components can be effectively removed by the precision filter.

[0014] Since the first resin column group and the second resin column group respectively include a cation resin column and an anion resin column, the liquid inlet of the cation resin column is connected to the liquid outlet of the first filtration device; the liquid outlet of the anion resin column is connected to the inositol purified liquid storage tank. The filtrate after being treated by the first filtration device enters the cation resin column in the first resin column group, and the effluent then enters the anion resin column for desalting treatment; the cation resin column and the anion resin column in the second resin column group are regenerated, and then replace the first resin column group to conduct desalting treatment on the filtrate.

[0015] Since the regeneration reagent delivery pipeline includes a hydrochloric acid delivery pipeline and a purified water delivery pipeline connected to the liquid inlet of the cation resin column, and a potassium hydroxide solution delivery pipeline and a purified water delivery pipeline connected to the liquid inlet of the anion resin column. After the hydrochloric acid in the hydrochloric acid delivery pipeline enters the cation resin column to treat the resin, the purified water in the purified water delivery pipeline rinses the resin, completing the regeneration of the resin in the cation resin column; after the potassium hydroxide solution in the potassium hydroxide solution delivery pipeline regenerates the resin in the anion resin column, the purified water rinses the resin. The above design is reasonable and realizes the regeneration treatment of the resin in the cation resin column and the anion resin column.

[0016] Since the liquid outlet of the cation resin column is connected to the first regeneration concentrated liquid storage tank and the first regeneration washing liquid storage tank, and the liquid outlet of the anion resin column is connected to the second regeneration concentrated liquid storage tank and the second regeneration washing liquid storage tank. Hydrochloric acid enters the cation resin column to regenerate the resin, and the outflowing regeneration concentrated liquid is stored in the first regeneration concentrated liquid storage tank, and then rinsed with purified water, and the outflowing regeneration washing liquid is stored in the first regeneration washing liquid storage tank; when the potassium hydroxide solution enters the anion resin column to regenerate the resin, the outflowing regeneration concentrated liquid is stored in the second regeneration concentrated liquid storage tank, and the outflowing regeneration washing liquid is stored in the second regeneration washing liquid storage tank. This design is reasonable and facilitates the effective recovery of amino acids, proteins, and salt ions in the first regeneration concentrated liquid, the first regeneration washing liquid, the second regeneration concentrated liquid, and the second regeneration washing liquid, avoiding waste of resources. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of a resin regeneration wastewater treatment system in the production of inositol according to the present utility model;

[0018] Among them, 1-inositol feed liquid conveying pipeline, 2-neutralization tank, 3-first filtration device, 4-precipitate storage tank, 5-first resin column group, 50-cation resin column, 51-anion resin column, 6-second resin column group, 7-inositol purified liquid storage tank, 8-regeneration reagent conveying pipeline, 80-hydrochloric acid conveying pipeline, 81-purified water conveying pipeline, 82-potassium hydroxide solution conveying pipeline, 9-first regeneration concentrated liquid storage tank, 10-first regeneration washing liquid storage tank, 11-second regeneration concentrated liquid storage tank, 12-second regeneration washing liquid storage tank, 13-first mixing tank, 14-second mixing tank, 15-second filtration device, 16-nanofiltration membrane equipment, 17-first storage tank, 18-second storage tank, 19-third filtration device, 20-reverse osmosis equipment, 21-third storage tank, 22-fourth storage tank, 23-resin regeneration water pipeline. Specific implementation manner

[0019] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0020] A resin regeneration wastewater treatment system in inositol production, as Figure 1As shown in the figure, it includes a neutralization tank 2 connected to the inositol feed liquid conveying pipeline 1. The discharge port of the neutralization tank 2 is connected to the first filtration device 3 (a plate and frame filter press with a filter cloth pore size of 400 - 600 mesh). The discharge port of the first filtration device 3 is connected to the precipitate storage tank 4. The liquid outlet of the first filtration device 3 is respectively connected to the first resin column group 5 and the second resin column group 6. The liquid outlets of the first resin column group 5 and the second resin column group 6 are respectively connected to the inositol purified liquid storage tank 7. The liquid inlets of the first resin column group 5 and the second resin column group 6 are respectively connected to the regeneration reagent conveying pipeline 8. The liquid outlet of the first resin column group 5 is respectively connected to the first regeneration concentrated liquid storage tank 9 and the first regeneration washing liquid storage tank 10. The liquid outlet of the second resin column group 6 is respectively connected to the second regeneration concentrated liquid storage tank 11 and the second regeneration washing liquid storage tank 12. The discharge ports of the first regeneration concentrated liquid storage tank 9 and the second regeneration concentrated liquid storage tank 11 are respectively connected to the first mixing tank 13. The outlets of the first regeneration washing liquid storage tank 9 and the second regeneration washing liquid storage tank 11 are respectively connected to the second mixing tank 14. The outlet of the first mixing tank 13 is connected to the second filtration device 15 (a precision filter with a filter element pore size of 0.5 - 1 micron). The liquid outlet of the second filtration device 15 is connected to the nanofiltration membrane device 16. The retentate outlet and the permeate outlet of the nanofiltration membrane device 16 are respectively connected to the first storage tank 17 and the second storage tank 18. The outlet of the second mixing tank 15 is connected to the third filtration device 19 (a precision filter with a filter element pore size of 0.5 - 1 micron). The liquid outlet of the third filtration device 19 is connected to the reverse osmosis device 20. The retentate outlet and the permeate outlet of the reverse osmosis device 20 are respectively connected to the third storage tank 21 and the fourth storage tank 22. The outlet of the fourth storage tank 22 is connected to the resin regeneration water pipeline 23.

[0021] The inositol solution separated by the simulated moving bed system enters the neutralization tank along the inositol feed solution pipeline. The feed solution after the neutralization reaction with the neutralizing agent enters the interior of the first filtration device. The precipitate is collected by the precipitate storage tank, and the filtrate enters the first resin column group (it should be noted that the first resin column group is also connected to the regeneration reagent pipeline, and the storage and treatment methods of the regeneration concentrated solution and regeneration washing solution for the regeneration treatment of the cation resin column and the anion resin column are the same as those of the second resin column regeneration treatment, but the drawings do not show them) or the second resin column group for desalination treatment. When entering the first resin column group for desalination treatment, the filtrate first enters the cation resin column, then enters the anion resin column, and the effluent is stored in the inositol purification liquid storage tank; the cation resin column and the anion resin column in the second resin column group are regenerated with the regeneration reagent. When the cation resin column is regenerated, the regeneration concentrated solution and the regeneration washing solution are stored in the first regeneration concentrated solution storage tank and the first regeneration washing solution storage tank respectively. When the anion resin column is regenerated, the regeneration concentrated solution and the regeneration washing solution are stored in the second regeneration concentrated solution storage tank and the second regeneration washing solution storage tank respectively; then the regeneration concentrated solutions in the first regeneration concentrated solution storage tank and the second regeneration concentrated solution storage tank enter the first mixing tank for mixing, and after being filtered by the second filtration device and treated by the nanofiltration membrane device, the retentate and the permeate are collected by the first storage tank and the second storage tank respectively (the permeate is potassium chloride solution, and after being concentrated by the concentration kettle, cooled and crystallized by the crystallization kettle, centrifuged by the centrifuge, and dried by the dryer, potassium chloride products are obtained); the regeneration washing solutions in the first regeneration washing solution storage tank and the second regeneration washing solution storage tank enter the second mixing tank for mixing, and after being filtered by the third filtration device and treated by the reverse osmosis membrane device, the retentate (which can be mixed with the retentate in the first storage tank, concentrated, and dried as a feed additive component) and the permeate (used as resin regeneration water) are collected by the third storage tank and the fourth storage tank respectively.

[0022] The first resin column group 5 and the second resin column group 6 respectively include a cation resin column 50 and an anion resin column 51. The inlet of the cation resin column 50 is connected to the outlet of the first filtration device 3; the outlet of the anion resin column 51 is connected to the inositol purification liquid storage tank 7. The filtrate after being treated by the first filtration device enters the cation resin column in the first resin column group, and the effluent then enters the anion resin column for desalination treatment; the cation resin column and the anion resin column in the second resin column group are regenerated, and then replace the first resin column group to conduct desalination treatment on the filtrate.

[0023] The regeneration reagent delivery pipeline 8 includes a hydrochloric acid delivery pipeline 80 and a purified water delivery pipeline 81 that are connected to the liquid inlet of the cation resin column, as well as a potassium hydroxide solution delivery pipeline 82 and a purified water delivery pipeline that are connected to the liquid inlet of the anion resin column. After the hydrochloric acid in the hydrochloric acid delivery pipeline enters the cation resin column to treat the resin, the purified water in the purified water delivery pipeline rinses the resin, completing the regeneration of the resin in the cation resin column; after the potassium hydroxide solution in the potassium hydroxide solution delivery pipeline regenerates the resin in the anion resin column, the purified water rinses the resin.

[0024] The liquid outlet of the cation resin column 50 is connected to the first regeneration concentrated liquid storage tank 9 and the first regeneration washing liquid storage tank 10, and the liquid outlet of the anion resin column 60 is connected to the second regeneration concentrated liquid storage tank 11 and the second regeneration washing liquid storage tank 12. Hydrochloric acid enters the cation resin column to regenerate the resin, and the outflowing regeneration concentrated liquid is stored in the first regeneration concentrated liquid storage tank, and then rinsed with purified water, and the outflowing regeneration washing liquid is stored in the first regeneration washing liquid storage tank; when the potassium hydroxide solution enters the anion resin column to regenerate the resin, the outflowing regeneration concentrated liquid is stored in the second regeneration concentrated liquid storage tank, and the outflowing regeneration washing liquid is stored in the second regeneration washing liquid storage tank. This design is reasonable and facilitates the effective recovery of amino acids, proteins, and salt ions in the first regeneration concentrated liquid, the first regeneration washing liquid, the second regeneration concentrated liquid, and the second regeneration washing liquid, avoiding waste of resources.

[0025] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A resin regeneration wastewater treatment system in inositol production, characterized in that: The invention comprises a neutralization tank connected to an inositol feed liquid delivery pipeline, wherein the discharge port of the neutralization tank is connected to a first filtering device, the discharge port of the first filtering device is connected to a sediment storage tank, the liquid outlet of the first filtering device is respectively connected to a first resin column group and a second resin column group, the liquid outlets of the first resin column group and the second resin column group are respectively connected to an inositol purified liquid storage tank; the liquid inlets of the first resin column group and the second resin column group are respectively connected to a regeneration reagent delivery pipeline, the liquid outlet of the first resin column group is respectively connected to a first regeneration concentrated liquid storage tank and a first regeneration washing liquid storage tank, the liquid outlet of the second resin column group is respectively connected to a second regeneration concentrated liquid storage tank and a second regeneration washing liquid storage tank; the first regeneration The outlets of the concentrate storage tank and the second regenerated concentrate storage tank are connected to the first mixing tank respectively, the outlets of the first regenerated washing liquid storage tank and the second regenerated washing liquid storage tank are connected to the second mixing tank respectively, the outlet of the first mixing tank is connected to the second filtering device, the liquid outlet of the second filtering device is connected to the nanofiltration membrane equipment, the retained liquid outlet and the permeate outlet of the nanofiltration membrane equipment are connected to the first storage tank and the second storage tank respectively; the outlet of the second mixing tank is connected to the third filtering device, the liquid outlet of the third filtering device is connected to the reverse osmosis equipment, the retained liquid outlet and the permeate outlet of the reverse osmosis equipment are connected to the third storage tank and the fourth storage tank respectively, and the liquid outlet of the fourth storage tank is connected to the resin regeneration water pipeline.

2. A resin regeneration wastewater treatment system for inositol production according to claim 1, characterized in that: The first filter device is a plate and frame filter, and the second filter device and the third filter device are both precision filters with a filter element pore size of 0.5-1 micron.

3. A resin regeneration wastewater treatment system for inositol production according to claim 1, characterized in that: The first resin column group and the second resin column group include a cationic resin column and an anionic resin column respectively. The liquid inlet of the cationic resin column is connected to the liquid outlet of the first filtering device; the liquid outlet of the anionic resin column is connected to the inositol purified liquid storage tank.

4. A resin regeneration wastewater treatment system for inositol production according to claim 3, characterized in that: The regeneration reagent delivery pipeline includes a hydrochloric acid delivery pipeline and a purified water delivery pipeline connected to the liquid inlet of the cation resin column, and a potassium hydroxide solution delivery pipeline and a purified water delivery pipeline connected to the liquid inlet of the anion resin column.

5. A resin regeneration wastewater treatment system for inositol production according to claim 3, characterized in that: The liquid outlet of the cation resin column is connected to the first regeneration concentrate storage tank and the first regeneration wash storage tank, and the liquid outlet of the anion resin column is connected to the second regeneration concentrate storage tank and the second regeneration wash storage tank.

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