CN214422428U - Forward osmosis acid recovery system - Google Patents
Forward osmosis acid recovery system Download PDFInfo
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- CN214422428U CN214422428U CN202022948467.2U CN202022948467U CN214422428U CN 214422428 U CN214422428 U CN 214422428U CN 202022948467 U CN202022948467 U CN 202022948467U CN 214422428 U CN214422428 U CN 214422428U
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Abstract
The utility model belongs to the technical field of the water treatment, concretely relates to just permeate sour recovery system. The utility model comprises an acid-proof selective forward osmosis device and an acid concentration electroosmosis plate device, wherein a discharge port of waste acid to be treated is connected with an inlet of the acid-proof selective forward osmosis device, and the waste acid to be treated flows out in two ways after being treated by the acid-proof selective forward osmosis device, wherein one way is dilute acid liquid which is then connected with an inlet of the acid concentration electroosmosis device, and the other way is residual acid liquid discharge system for additional treatment; after the treatment of the acid concentration electrodialysis device, the acid concentration electrodialysis device is divided into two paths, wherein fresh water produced in one path is discharged out of the system and can be reused; the other part of the high-concentration acid produced in the other path is used as a product discharge system, and the other part of the high-concentration acid returns to the inlet of the acid-resistant selective forward osmosis device. The utility model has the advantages that in the sour recovery process, can be more environmental protection, pollution abatement, can realize furthest's recycle moreover, reduce secondary pollution, and the rate of recovery is high.
Description
Technical Field
The utility model belongs to the technical field of the water treatment, concretely relates to just permeate sour recovery unit.
Background
Forward Osmosis (FO) is a membrane separation process that does not require applied pressure as a driving force, but relies only on osmotic pressure to drive. The most remarkable characteristic of forward osmosis membrane separation technology relative to the membrane separation technology driven by external pressure is that the forward osmosis membrane separation technology does not need external pressure or operates under very low external pressure, the membrane pollution condition is relatively light, and the forward osmosis membrane separation technology can operate for a long time without cleaning. Forward osmosis membrane separation technology is currently being studied and applied internationally in countries and regions such as the united states, singapore, europe, etc. The basic principle, influencing factors and the current state of application and research in the world of forward osmosis membrane separation technology are reviewed, and the future research direction in the field is envisioned.
In the industrial production, mining and smelting (such as steel industry, titanium dioxide industry, wet copper smelting industry, titanium material industry, electroplating industry, rare earth industry, wood saccharification industry, gold mining and non-ferrous metal smelting industry) processes, inorganic acid (such as sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid and the like) is often used for cleaning metal surfaces or dissolving ores, so that a large amount of waste acid solution containing various metal ions is generated, if the waste acid solution is discharged without treatment, natural resources are wasted, and more serious, the environment, soil and water sources are polluted. Therefore, taking measures to separate, purify and recycle them is always a focus of attention.
The waste acid is recovered by a forward osmosis membrane method by adopting an osmosis principle, and the whole forward osmosis device is formed by combining a forward osmosis membrane, a liquid distribution plate, a reinforcing plate, a liquid flow plate frame and the like. A certain number of membranes form different numbers of structural units; wherein each cell is separated into a permeate chamber a and a receiving chamber B by a forward osmosis membrane. When the waste acid solution and the receiving solution (draw solution) are respectively introduced to both sides of the forward osmosis membrane, the concentration of sulfuric acid and salts thereof is lower on the waste acid solution side than on the draw side, and therefore, the waste acid and salts thereof tend to permeate into the chamber B due to the concentration gradient. However, the membrane is selectively permeable, and does not allow every kind of ion to pass through with equal chance, and first the acid recovers the positive charge of the positive osmosis membrane, and can attract the negatively charged hydrated ions in the solution and repel the positively charged hydrated ions, so under the action of the concentration difference, the anions on the waste acid side are attracted and smoothly permeate the membrane pore channel to enter the side of the drawing liquid. Because of adopting the countercurrent operation, the concentration of acid in the acid chamber is greatly increased due to permeation at the waste liquid outlet and is still higher than that of acid in the intake drawing liquid, and in addition, when the membrane is actually made, the water content and the pore diameter of the membrane can be controlled by side group substitution, so the recovery rate of the forward osmosis acid recovery membrane to acid can generally reach more than 80 percent.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main objective is to develop a just permeating sour recovery unit.
The utility model discloses a following technical scheme can realize:
the utility model provides a positive osmotic acid recovery system, includes acid-resistant selective positive osmotic device, acid concentration electroosmosis board device which characterized in that: the discharge port of waste acid to be treated is connected with the inlet of the acid-resistant selective forward osmosis device, and the waste acid flows out in two paths after being treated by the acid-resistant selective forward osmosis device, wherein one path is dilute acid solution and then is connected with the inlet of the acid concentration electrodialysis device, and the other path is residual acid solution discharged out of the system for additional treatment;
after the treatment of the acid concentration electrodialysis device, the acid concentration electrodialysis device is divided into two paths, wherein fresh water produced in one path is discharged out of the system and can be reused; the other part of the high-concentration acid produced in the other path is used as a product discharge system, and the other part of the high-concentration acid returns to the inlet of the acid-resistant selective forward osmosis device.
Wherein, the acid-resistant selective forward osmosis device is formed by a pair of clamping steel plates, a pair of water distribution plates and a membrane group consisting of an acid-resistant nanofiltration membrane and a partition plate; the membrane module can repeatedly pack 10-1200 pairs of separators and forward osmosis membranes.
Preferably, one of the water distribution plates in the forward osmosis acid recovery system comprises a waste acid inlet and a residual acid outlet; the other water distribution plate comprises a dilute acid outlet and a high-quality and high-concentration acid inlet.
Preferably, the flat acid-resistant forward osmosis membrane prepared from polyimide in the acid-resistant selective forward osmosis device in the forward osmosis acid recovery system has the retention rate of 90-95% and the membrane flux of 0.1-2L/sq.m.hr.
Preferably, the acid concentration electroosmosis plate device in the forward osmosis acid recovery system adopts a high-power acid-resistance concentration homogeneous electrodialysis membrane, the adopted cation exchange membrane is the ion selectivity of the cation exchange membrane of 98.5-99.5%, and the membrane resistance is 3-5 ohm/square centimeter; the exchange group of the cathode membrane is m-benzoic acid group.
The forward osmosis acid recovery device is characterized in that in the using process: the waste acid to be recovered with the concentration of 1-8 percent and the high-concentration high-quality acid with the concentration of 10-15 percent can enter an acid-resistant selective forward osmosis device, the waste acid to be recovered is recovered by the acid-resistant selective forward osmosis device to reach the expected recovery rate of 70-90 percent and then residual acid is discharged, and the high-concentration high-quality acid is filtered by the acid-resistant selective forward osmosis device to become dilute acid liquid with the concentration of 0.5-7 percent and then enters an acid concentration electroosmosis plate device. The dilute acid enters an acid concentration electroosmosis plate device for concentration and then is divided into a high-quality high-concentration acid solution with the concentration of 10-15% and a low-concentration dilute acid with the concentration of 0.01-0.1%, the dilute acid is discharged after neutralization or recycled after reverse osmosis desalination, and the high-quality high-concentration acid with the concentration of 10-15% returns to the acid-resistant selective forward osmosis component.
In the forward osmosis acid recovery device, in order to improve the efficiency, a waste acid inlet is arranged on a water distribution plate of the device and is positioned at the lower left corner of the device, and a residual acid outlet is positioned at the upper left corner of the device; the high-quality high-concentration acid inlet is positioned at the lower right corner of the device; the dilute acid outlet is positioned at the right lower corner of the device;
an acid concentration homogeneous phase membrane electrodialysis component in a forward osmosis acid recovery device is an electrodialysis device adopting a high-power acid-resistant concentration homogeneous phase electrodialysis membrane. Cation exchange membranes used are, for example: the Nippon Fuji TPPE-100 type acid-resistant positive membrane adopts a negative membrane with an exchange group of m-benzoic acid group, the cation exchange membrane has an ion selectivity of 98.5-99.5%, a membrane resistance of 3-5 ohm/square centimeter, can concentrate hydrochloric acid to 10-15%, and has a current efficiency of 50-85%.
After the treatment process, the recovery rate of the acid can reach 50-90 percent, and the removal rate of impurities in the recovered acid reaches 90-97 percent.
Has the advantages that: through the utility model discloses a device can be more environmental protection, pollution abatement at sour recovery process, can realize furthest's recycle moreover, reduces secondary pollution, and the rate of recovery is high.
Drawings
FIG. 1 is a schematic view of the flow structure of the present invention
FIG. 2 is a schematic structural view of an acid-resistant permselective device of the present invention
1. Clamping the steel plate; 2. a water distribution plate; 3. an acid-resistant nanofiltration membrane; 4. a partition plate; 5. a residual acid outlet;
6. waste acid is imported; 7. a dilute acid outlet; 8. high-quality high-concentration acid inlet
Detailed Description
The following description will be made in detail with reference to the accompanying drawings:
example 1
As shown in the accompanying drawings 1 and 2, the forward osmosis acid recovery system comprises an acid-resistant selective forward osmosis device and an acid concentration electroosmosis plate device, wherein a discharge port of waste acid to be treated is connected with an inlet of the acid-resistant selective forward osmosis device, the waste acid treated by the acid-resistant selective forward osmosis device flows out in two ways, one way is dilute acid solution and then is connected with an inlet of the acid concentration electroosmosis device, and the other way is residual acid solution discharged out of the system for additional treatment; after the treatment of the acid concentration electrodialysis device, the acid concentration electrodialysis device is divided into two paths, wherein fresh water produced in one path is discharged out of the system and can be reused; the other part of the high-concentration acid produced in the other path is used as a product discharge system, and the other part of the high-concentration acid returns to the inlet of the acid-resistant selective forward osmosis device. The acid-resistant selective forward osmosis device comprises a pair of clamping steel plates 1, a pair of water distribution plates 2 and a membrane group consisting of an acid-resistant nanofiltration membrane 3 and a partition plate 4.
The acid-resistant selective forward osmosis membrane is a flat acid-resistant forward osmosis membrane prepared from polyimide, the retention rate of the acid-resistant forward osmosis membrane is 92%, and the membrane flux is 0.15 liter/square meter for hours. Starting by adopting a clamping steel plate 1, repeatedly stacking 200 pairs of partition plates and forward osmosis membranes by using a water distribution plate 2, a No. 1 partition plate 4, an acid-resistant forward osmosis membrane 3, a No. 2 partition plate 4 and an acid-resistant forward osmosis membrane 3, and finally assembling the device by adding the water distribution plate 2 and the clamping steel plate 1; one plate of the water distribution plate 2 comprises a waste acid inlet 6 and a residual acid outlet 5; the other water distribution plate 2 comprises a dilute acid outlet 7 and a high-quality high-concentration acid inlet 8.
The cation exchange membrane adopted by the acid concentration homogeneous membrane electrodialysis device is a Japanese Fuji TPPE-100 type acid-resistant positive membrane, the exchange group of the adopted negative membrane is an m-benzoic acid group, the ion selectivity of the cation exchange membrane is 98.5%, the membrane resistance is 4.2 ohm/square centimeter, the hydrochloric acid can be concentrated to 13%, and the current efficiency can reach 62%.
In this embodiment, the waste acid to be recovered with a concentration of 2% and the high-concentration high-quality acid with a concentration of 13% enter the acid-resistant selective forward osmosis device, the waste acid to be recovered is recovered by the acid-resistant selective forward osmosis device to achieve an expected recovery rate of 85% and then is discharged as residual acid, and the high-concentration high-quality acid is filtered by the acid-resistant selective forward osmosis device to become a dilute acid solution with a concentration of 2.5% and then enters the acid-concentration homogeneous membrane electrodialysis device. The dilute acid enters an acid concentration homogeneous membrane electrodialysis device for concentration and then is divided into a high-quality high-concentration acid solution with the concentration of 13% and a low-concentration dilute acid with the concentration of 0.05%, the dilute acid is discharged after neutralization or recycled after reverse osmosis desalination, and the high-quality high-concentration acid with the concentration of 13% returns to the acid-resistant selective forward osmosis component.
After the treatment process, the recovery rate of the acid can reach 82 percent, and the removal rate of impurities in the recovered acid reaches 95 percent.
Example 2
The acid-resistant selective forward osmosis membrane is a flat acid-resistant forward osmosis membrane prepared from polyimide, the retention rate of the acid-resistant forward osmosis membrane is 95%, and the membrane flux is 0.1-2L/square meter for hours. Starting by adopting a clamping steel plate 1, repeatedly stacking 400 pairs of partition plates and forward osmosis membranes by adopting a water distribution plate 2, a partition plate No. 1, an acid-resistant forward osmosis membrane 3, a partition plate No. 2 and an acid-resistant forward osmosis membrane 3, and finally assembling the water distribution plate 2 and the clamping steel plate 1 into an acid-resistant forward osmosis combiner;
the cation exchange membrane adopted by the acid concentration homogeneous membrane electrodialysis device is a Japanese Fuji TPPE-100 type acid-resistant positive membrane, the exchange group of the adopted negative membrane is an m-benzoic acid group, the ion selectivity of the cation exchange membrane is 99.2%, the membrane resistance is 4.6 ohm/square centimeter, the hydrochloric acid can be concentrated to 14%, and the current efficiency can reach 65%.
Waste acid with the concentration of 5 percent to be recovered enters the acid-resistant selective forward osmosis device from the waste acid inlet 6 and is mixed with high-concentration high-quality acid with the concentration of 14 percent to enter the acid-resistant selective forward osmosis device, the waste acid to be recovered is recovered by the acid-resistant selective forward osmosis device to achieve the expected recovery rate of 85 percent and then is discharged from the residual acid outlet 5, and the high-concentration high-quality acid is filtered by the acid-resistant selective forward osmosis device to become dilute acid liquid with the concentration of 3.5 percent and then enters the acid concentration homogeneous phase membrane electrodialysis device through the dilute acid outlet 7. The dilute acid enters an acid concentration homogeneous membrane electrodialysis device for concentration and then is divided into a high-quality high-concentration acid solution with the concentration of 14% and a low-concentration dilute acid with the concentration of 0.08%, the dilute acid is discharged after neutralization or recycled after reverse osmosis desalination, and the high-quality high-concentration acid with the concentration of 13% returns to the acid-resistant selective forward osmosis device.
After the treatment process, the recovery rate of the acid can reach 85 percent, and the removal rate of impurities in the recovered acid reaches 96 percent.
Example 3
The acid-resistant selective forward osmosis membrane is a flat acid-resistant forward osmosis membrane prepared from polyimide, the retention rate of the acid-resistant forward osmosis membrane is 95%, and the membrane flux is 0.1 liter/square meter for hours. Starting by adopting a clamping steel plate 1, repeatedly stacking 600 pairs of partition plates and forward osmosis membranes by adopting a water distribution plate 2, a No. 1 partition plate 4, an acid-resistant forward osmosis membrane 3, a No. 2 partition plate 4 and an acid-resistant forward osmosis membrane 3, and finally assembling the clamping steel plate 1 with the water distribution plate 2 to form a device;
the cation exchange membrane adopted by the acid concentration homogeneous membrane electrodialysis device is a Japanese Fuji TPPE-100 type acid-resistant positive membrane, the exchange group of the adopted negative membrane is an m-benzoic acid group, the ion selectivity of the cation exchange membrane is 99.1%, the membrane resistance is 5 ohm/square centimeter, the hydrochloric acid can be concentrated to 15%, and the current efficiency can reach 80%.
The waste acid with the concentration of 7 percent to be recovered and the high-concentration high-quality acid with the concentration of 15 percent enter an acid-resistant selective forward osmosis device, the waste acid to be recovered reaches the expected recovery rate of 90 percent after being recovered by the acid-resistant selective forward osmosis device, the residual acid is discharged, and the high-concentration high-quality acid is filtered by the acid-resistant selective forward osmosis device to become the dilute acid solution with the concentration of 6.5 percent and then enters an acid-concentration homogeneous membrane electrodialysis device. The dilute acid enters an acid concentration homogeneous membrane electrodialysis device for concentration and then is divided into a high-quality high-concentration acid solution with the concentration of 15% and a low-concentration dilute acid with the concentration of 0.1%, the dilute acid is discharged after neutralization or recycled after reverse osmosis desalination, and the high-quality high-concentration acid with the concentration of 15% returns to the acid-resistant selective forward osmosis component.
After the treatment process, the recovery rate of the acid can reach 90 percent, and the removal rate of impurities in the recovered acid reaches 96 percent.
Claims (4)
1. The utility model provides a positive osmotic acid recovery system, includes acid-resistant selective positive osmotic device, acid concentration electroosmosis board device which characterized in that: the discharge port of waste acid to be treated is connected with the inlet of the acid-resistant selective forward osmosis device, and the waste acid flows out in two paths after being treated by the acid-resistant selective forward osmosis device, wherein one path is dilute acid solution and then is connected with the inlet of the acid concentration electrodialysis device, and the other path is residual acid solution discharged out of the system for additional treatment;
after the treatment of the acid concentration electrodialysis device, the acid concentration electrodialysis device is divided into two paths, wherein fresh water produced in one path is discharged out of the system and can be reused; the other path of the produced high-concentration acid is used as a product discharge system, and the other path of the produced high-concentration acid returns to the inlet of the acid-resistant selective forward osmosis device;
the acid-resistant selective forward osmosis device comprises a pair of clamping steel plates (1), a pair of water distribution plates (2) and a membrane group consisting of an acid-resistant nanofiltration membrane (3) and a partition plate (4).
2. A forward osmosis acid recovery system according to claim 1, wherein one of the water distribution plates (2) comprises a spent acid inlet (6) and a residual acid outlet (5); the other water distribution plate (2) comprises a dilute acid outlet (7) and a high-quality and high-concentration acid inlet (8).
3. The forward osmosis acid recovery system of claim 1, wherein the acid-resistant permselective forward osmosis device comprises a flat acid-resistant forward osmosis membrane made of polyimide, the acid-resistant forward osmosis membrane has a retention rate of 90-95% and a membrane flux of 0.1-2 liters per square meter per hour.
4. The forward osmosis acid recovery system of claim 1, wherein the acid concentration electrodialysis plate device employs a highly acid-resistant concentration homogeneous electrodialysis membrane, the cation exchange membrane employed has an ion selectivity of 98.5-99.5% for the cation exchange membrane, and a membrane resistance of 3-5 ohm/cm; the exchange group of the cathode membrane is m-benzoic acid group.
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| CN202022948467.2U CN214422428U (en) | 2020-12-08 | 2020-12-08 | Forward osmosis acid recovery system |
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| CN202022948467.2U CN214422428U (en) | 2020-12-08 | 2020-12-08 | Forward osmosis acid recovery system |
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| CN214422428U true CN214422428U (en) | 2021-10-19 |
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