CN219689438U - Membrane treatment device for recycling finishing liquid - Google Patents
Membrane treatment device for recycling finishing liquid Download PDFInfo
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- CN219689438U CN219689438U CN202321342568.2U CN202321342568U CN219689438U CN 219689438 U CN219689438 U CN 219689438U CN 202321342568 U CN202321342568 U CN 202321342568U CN 219689438 U CN219689438 U CN 219689438U
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- 239000012528 membrane Substances 0.000 title claims abstract description 254
- 239000007788 liquid Substances 0.000 title claims abstract description 54
- 238000004064 recycling Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 290
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 147
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 84
- 238000004519 manufacturing process Methods 0.000 claims description 20
- 239000012510 hollow fiber Substances 0.000 claims description 10
- 238000005498 polishing Methods 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000004907 flux Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000007730 finishing process Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000005374 membrane filtration Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The utility model discloses a membrane treatment device for recovering finishing liquid, which comprises an ultrafiltration membrane device, a primary reverse osmosis membrane device and a secondary reverse osmosis membrane device, wherein the ultrafiltration membrane device comprises a water inlet tank, an ultrafiltration water inlet pump, a blower, a membrane component and an ultrafiltration water producing tank, the primary reverse osmosis membrane device comprises a primary water inlet pump, a primary booster pump, a primary circulating pump, a primary reverse osmosis membrane component, a primary water producing tank and a finishing liquid recycling water tank, and the secondary reverse osmosis membrane device comprises a secondary water inlet pump, a secondary booster pump, a secondary reverse osmosis membrane component, a secondary circulating pump and a desalted water recycling water tank. The utility model recovers the finishing liquid in the wastewater through the pollution-resistant membrane component, and ensures the performance of recovering the finishing liquid and the stable operation of the device.
Description
Technical Field
The utility model relates to a membrane treatment device for recovering finishing liquid, and belongs to the technical field of environment-friendly sewage treatment.
Background
In order to meet the requirements of various industries on steel, the surface treatment of the cold-rolled strip steel also gradually increases the treatment types of cold-rolled plates, such as acid-washed plates, hot-galvanized plates, hot-dip aluminum-zinc plates, electro-galvanized plates, electroplated tin plates and the like. As the requirements for deep processing quality of each type of steel plate are higher and higher, the surface treatment process of the steel plate tends to be complex. In order to improve the rust resistance of the strip steel and improve the quality of the steel, a wet finishing process is widely adopted. The wet finishing system uses the mixed solution of finishing agent and desalted water or pure desalted water as finishing liquid, and has the main function of cooling and lubricating the finishing roller, and is generally called finishing liquid waste water after being directly discharged after being used because the flow rate of the wet finishing system is not large.
The existing wet finishing process uses a direct injection process to prepare water and finishing stock solution into finishing liquid, and after one use, all the finishing liquid is thoroughly discharged. The latest environmental protection law prescribes that the Chemical Oxygen Demand (COD) emission value of the finishing liquid pollutants is below 30mg/L, so that the technical difficulty of treating the finishing liquid after environmental protection upgrading is greater and greater, and the resource recovery consumption is higher and higher. Environmental standards have a trend of further upgrading, and the existing chemical and biochemical treatment measures may face the situation that the discharge of waste liquid exceeds the standard.
At present, there are engineering cases of recycling finishing liquid, but some water quality problems can be generated in the recycling process, and the water quality problems can be solved by membrane filtration. For example, bacteria multiplication, iron powder accumulation, etc., all of which can be solved by membrane filtration. The performance of the finishing liquid is not changed greatly before and after the use, so the finishing liquid has recycling value.
Because the flushing wastewater of the finishing machine contains oils, iron powder, zinc powder and various complex organic matters (surfactants, lubricants and the like), the pollutants can pollute the membrane, and therefore, the selection of a membrane assembly which is suitable, occupies small area and runs stably is also a key problem for recycling the finishing liquid.
Disclosure of Invention
The utility model aims to provide a membrane treatment device for recovering finishing liquid, which solves the problems in the background technology, realizes the stable operation of the device and ensures the performance of recovering the finishing liquid.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a membrane treatment device for recycling finishing liquid comprises a water inlet tank, wherein a water outlet of the water inlet tank is connected with a water inlet pipe sequentially through an ultrafiltration water inlet pump and a water inlet valve, an air outlet pipe of an air blower is connected with the water inlet pipe through an air inlet valve, the water inlet pipe is connected with an ultrafiltration membrane water inlet of an ultrafiltration membrane component, an ultrafiltration membrane concentrated water port of the ultrafiltration membrane component is communicated to a water inlet of the water inlet tank through a concentrated water pipe, and an ultrafiltration membrane water outlet of the ultrafiltration membrane component is communicated to a water inlet of the ultrafiltration water outlet tank through a water outlet pipe;
the water outlet of the ultrafiltration water producing tank is connected with the reverse osmosis membrane water inlet of the first-stage reverse osmosis membrane assembly through the first-stage water inlet pump and the first-stage booster pump (13), the reverse osmosis membrane water producing port of the first-stage reverse osmosis membrane assembly is connected with the water inlet of the first-stage water producing tank, the reverse osmosis membrane concentrated water port of the first-stage reverse osmosis membrane assembly is respectively connected with the finishing liquid recycling water tank and the water inlet of the first-stage circulating pump, and the water outlet of the first-stage circulating pump is connected with the reverse osmosis membrane water inlet of the first-stage reverse osmosis membrane assembly;
the water outlet of the primary water production tank is connected with the reverse osmosis membrane water inlet of the secondary reverse osmosis membrane assembly through the secondary water inlet pump and the secondary booster pump in sequence, the reverse osmosis membrane water production port of the secondary reverse osmosis membrane assembly is connected with the desalted water recycling tank, the reverse osmosis membrane concentrated water port of the secondary reverse osmosis membrane assembly is respectively connected with the ultrafiltration water production tank and the water inlet of the secondary circulating pump, and the water outlet of the secondary circulating pump is connected with the reverse osmosis membrane water inlet of the secondary reverse osmosis membrane assembly.
As described above, the ultrafiltration membrane components are plural, the first-stage reverse osmosis membrane components are plural, and the second-stage reverse osmosis membrane components are plural.
As mentioned above, the air outlet pipe of the blower is also provided with a check valve and a flowmeter, and the water inlet pipe is provided with an exhaust valve.
And the water inlet pipe, the concentrated water pipe and the water production pipe are respectively provided with a flowmeter and a pressure gauge.
As described above, the membrane filaments in the ultrafiltration membrane module are external pressure type hollow fiber membranes, the external pressure type hollow fiber membranes are made of PVDF or PTFE, and the membrane pore diameter of the external pressure type hollow fiber membranes is 0.05-0.1 μm.
As described above, the membrane filaments in the primary reverse osmosis membrane module and the membrane filaments in the secondary reverse osmosis membrane module are both disc-tube reverse osmosis membranes.
The utility model can effectively ensure the performance of recovering the finishing liquid and the stable operation of the treatment device.
The utility model has the following obvious and beneficial technical effects:
(1) The recovered finishing liquid is good, and no pollution of microorganisms, iron powder and the like exists; (2) The concentration of the finishing liquid is controlled by monitoring the change of the concentration of the finishing liquid through the concentrated water concentration, and the recovery rate of the membrane system is controlled, so that the concentration of the recovered finishing liquid is relatively stable, and the use of the finishing liquid system is facilitated; (3) The equipment occupies a small area, the automation degree is high, and the membrane device operates stably.
Drawings
FIG. 1 is a schematic view of a membrane treatment apparatus for recovering polishing liquid;
FIG. 2 is a schematic structural view of an ultrafiltration membrane module;
FIG. 3 is a schematic structural diagram of a primary reverse osmosis membrane module and a secondary reverse osmosis membrane module;
in the figure: 1-a water inlet tank; 2-ultrafiltering a water inlet pump; 3-a water inlet valve; 4-an evacuation valve; 5-an air inlet valve; 6-a blower; 7-an ultrafiltration membrane module; 8-a water inlet pipe; 9-a concentrated water pipe; 10-a water producing pipe; 11-ultrafiltering a water producing tank; 12-a primary water inlet pump; 13-a first-stage booster pump; 14-a primary circulating pump; 15-a first-stage reverse osmosis membrane component; 16-first-level water producing tank; 17-a finishing liquid recycling water tank; 18-a secondary water inlet pump; 19-a two-stage booster pump; a 20-second-stage reverse osmosis membrane module; 21-a secondary circulation pump; 22-desalted water recycling water tank and 31-ultrafiltration membrane water inlet; 32-ultrafiltration membrane water producing port; 33-an ultrafiltration membrane concentrated water port; 41-reverse osmosis membrane water inlet; 42-reverse osmosis membrane water producing port; 43-reverse osmosis membrane water concentration port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, a membrane treatment device for recovering a finishing liquid comprises an ultrafiltration membrane device, a primary reverse osmosis membrane device and a secondary reverse osmosis membrane device, wherein the ultrafiltration membrane device comprises a water inlet tank 1, an ultrafiltration water inlet pump 2, a blower 6, an ultrafiltration membrane component 7 and an ultrafiltration water producing tank 11, the primary reverse osmosis membrane device comprises a primary water inlet pump 12, a primary booster pump 13, a primary circulating pump 14, a primary reverse osmosis membrane component 15, a primary water producing tank 16 and a finishing liquid recycling water tank 17, and the secondary reverse osmosis membrane device comprises a secondary water inlet pump 18, a secondary booster pump 19, a secondary reverse osmosis membrane component 20, a secondary circulating pump 21 and a desalted water recycling water tank 22.
In the ultrafiltration membrane device, a water outlet of a water inlet tank 1 is connected with a water inlet pipe 8 sequentially through an ultrafiltration water inlet pump 2 and a water inlet valve 3, an air outlet pipe of a blower 6 is connected with the water inlet pipe 8 through an air inlet valve 5, the water inlet pipe 8 is connected with an ultrafiltration membrane water inlet 31 of an ultrafiltration membrane component 7, an ultrafiltration membrane concentrated water port 33 of the ultrafiltration membrane component 7 is communicated with a water inlet of the water inlet tank 1 through a concentrated water pipe 9, and an ultrafiltration membrane water outlet 32 of the ultrafiltration membrane component 7 is communicated with a water inlet of an ultrafiltration water outlet tank 11 through a water outlet pipe 10. The finishing liquid wastewater in the water inlet tank 1 is pressurized by the ultrafiltration water inlet pump 2, is aerated by the blower 6 and flows into the ultrafiltration membrane water inlet 31, so that the formation of a pollution layer in the ultrafiltration membrane component 7 can be slowed down; oil and suspended matters in the wastewater of the finishing machine are removed through an ultrafiltration membrane component 7, such as: zinc powder iron powder, and the like; the concentrated water in the ultrafiltration membrane component 7 flows into the water inlet tank 1 through the ultrafiltration membrane concentrated water port 33, so that the concentrated water can be treated again by the ultrafiltration membrane device; the ultrafiltration product water obtained by the ultrafiltration membrane module 7 flows to the ultrafiltration product water tank 11 through the ultrafiltration membrane producing port 32 for subsequent reverse osmosis membrane treatment.
For a primary reverse osmosis membrane device: the water outlet of the ultrafiltration water producing tank 11 is communicated with the reverse osmosis membrane water inlet 41 of the first-stage reverse osmosis membrane assembly 15 by a water conveying pipeline sequentially through the first-stage water inlet pump 12 and the first-stage booster pump 13, the reverse osmosis membrane water producing port 42 of the first-stage reverse osmosis membrane assembly 15 is communicated with the water inlet of the first-stage water producing tank 16, the reverse osmosis membrane concentrated water port 43 of the first-stage reverse osmosis membrane assembly 15 is respectively communicated with the water inlets of the finishing liquid recycling water tank 17 and the first-stage circulating pump 14, and the water outlet of the first-stage circulating pump 14 is connected to the reverse osmosis membrane water inlet 41 of the first-stage reverse osmosis membrane assembly 15. The ultrafiltration product water collected by the ultrafiltration product water tank 11 is pressurized by the primary water inlet pump 12 and the primary booster pump 13 and then is transmitted to the primary reverse osmosis membrane assembly 15 for reverse osmosis membrane treatment, the obtained product water flows into the primary product water tank 16 from the reverse osmosis membrane water outlet 42 of the primary reverse osmosis membrane assembly 15 so as to be subjected to subsequent treatment, and the concentrated water of the primary reverse osmosis membrane assembly 15 flowing into the finishing liquid recycling water tank 17 is used as recycled finishing liquid and can be reused.
For a secondary reverse osmosis membrane device: the water outlet of the primary water production tank 16 is connected with a reverse osmosis membrane water inlet 41 in the secondary reverse osmosis membrane assembly 20 after passing through the secondary water inlet pump 18 and the secondary booster pump 19 in sequence; the reverse osmosis membrane water producing port 42 of the secondary reverse osmosis membrane assembly 20 is communicated with the desalted water recycling water tank 22; the reverse osmosis membrane water concentration port 43 of the secondary reverse osmosis membrane assembly 20 is respectively communicated with the water inlet of the secondary circulating pump 21 and the ultrafiltration water production tank 11, and the water outlet of the secondary circulating pump 21 is communicated with the reverse osmosis membrane water inlet 41 of the secondary reverse osmosis membrane assembly 20. The produced water of the first-stage reverse osmosis membrane assembly 15 collected by the first-stage produced water tank 16 flows into the second-stage reverse osmosis membrane assembly 20 after being pressurized by the second-stage water inlet pump 18 and the second-stage booster pump 19, the obtained produced water flows into the desalted water recycling water tank 22 from the reverse osmosis membrane water outlet 42 of the second-stage reverse osmosis membrane assembly 20 and can be recycled as recovered desalted water, and the concentrated water obtained by the second-stage reverse osmosis membrane assembly 20 flows into the ultrafiltration produced water tank 11 to be purified by the next-stage reverse osmosis membrane device and the second-stage reverse osmosis membrane device.
The ultrafiltration membrane component 7, the primary reverse osmosis membrane component 15 and the secondary reverse osmosis membrane component 20 are all of the existing structures.
The reverse osmosis membrane water concentration port 43 in the first-stage reverse osmosis membrane assembly 15 is simultaneously communicated with the first-stage circulating pump 14 and the finishing liquid recycling water tank 17, and the first-stage circulating pump 14 is used for improving the circulating flow rate of the first-stage reverse osmosis membrane assembly 15 and ensuring the concentrated water circulation concentration of the first-stage reverse osmosis membrane assembly 15. The flow rate of the primary circulation pump 14 is related to the parallel connection quantity of the primary reverse osmosis membrane components 15, the flow rate of the water flowing into the finishing liquid recycling water tank 17 depends on the required water yield (namely the ratio of the water yield to the water inflow), the water inflow=the water yield+the concentrated water yield, and the flow rate of the water flowing into the finishing liquid recycling water tank 17 is the concentrated water yield discharged by the primary reverse osmosis membrane components 15 and needs to be adjusted according to the recovery rate. Similarly, the reverse osmosis water concentration port 43 of the secondary reverse osmosis membrane module 20 is simultaneously communicated with the secondary circulation pump 21 and the ultrafiltration water producing tank 11.
The primary reverse osmosis membrane device and the secondary reverse osmosis membrane device can remove dissolved salts, colloid, microorganisms and organic matters in wastewater of the finishing machine, wherein the secondary reverse osmosis membrane device further processes produced water of the primary reverse osmosis membrane device, and the final produced water conductivity is ensured to be lower than 10 mu s/cm. The desalination rate of the first-stage reverse osmosis membrane device is about 95%, the concentrated water conductivity of the first-stage reverse osmosis membrane assembly 15 is 250 mu s/cm-1000 mu s/cm, the water production conductivity is 10 mu s/cm-70 mu s/cm, the desalination rate of the second-stage reverse osmosis membrane device is about 95%, the concentrated water conductivity of the second-stage reverse osmosis membrane assembly 20 is 100 mu s/cm-200 mu s/cm, and the water production conductivity is less than 10 mu s/cm.
As a preferable scheme, in order to improve the treatment efficiency of the membrane treatment device, a plurality of ultrafiltration membrane components 7 are connected in parallel, a plurality of water outlet branches are arranged on the side wall of a main pipe of the water inlet pipe 8, and the water outlet branches of the water inlet pipe 8 are correspondingly connected with the ultrafiltration membrane water inlets 31 one by one; a plurality of water inlet branches are arranged on the side wall of the main pipe of the water production pipe 10, the ultrafiltration membrane water production ports 32 are connected with the water inlet branches of the water production pipe 10 in a one-to-one correspondence manner, and the main pipe outlet of the water production pipe 10 is connected to the water inlet of the ultrafiltration water production tank 11; the side wall of the concentrated water pipe 9 is provided with a plurality of water inlet branches, the ultrafiltration membrane concentrated water port 33 is connected with the water inlet branches of the concentrated water pipe 9 in a one-to-one correspondence manner, and the main pipe outlet of the concentrated water pipe 9 is connected to the water inlet of the water inlet tank 1. The ultrafiltration water inlet pump 2 is communicated with a plurality of ultrafiltration membrane water inlets 31 through a water inlet pipe 8 comprising a plurality of water outlet branches, so that the treatment efficiency of the whole ultrafiltration membrane device is increased, and correspondingly, the concentrated water in each ultrafiltration membrane component 7 is returned to the water inlet tank 1 through a concentrated water pipe 9 comprising a plurality of water inlet branches so as to be reprocessed through the ultrafiltration membrane component 7; the produced water in each ultrafiltration membrane module 7 is communicated to a produced water tank 11 through a produced water pipe 10 containing a plurality of produced water inlet branches for subsequent reverse osmosis membrane treatment.
Similarly, a plurality of primary reverse osmosis membrane modules 15 are connected in parallel and a plurality of secondary reverse osmosis membrane modules 20 are connected in parallel.
As a preferable scheme, the air outlet pipe of the blower 6 is also provided with a check valve and a flowmeter, the water inlet pipe 8 is provided with an evacuation valve 4, and the evacuation valve 4 is positioned on the main pipe outlet of the water inlet pipe 8 for the case of connecting a plurality of water inlet pipes 8 in parallel.
Furthermore, the water inlet pipe 8, the water producing pipe 10 and the concentrated water pipe 9 are respectively provided with a flowmeter and a pressure gauge.
As a preferable scheme, the membrane wires in the ultrafiltration membrane component 7 are external pressure type hollow fiber membranes, the external pressure type hollow fiber membranes are made of PVDF or PTFE, and the membrane pore diameter of the external pressure type hollow fiber membranes is 0.05-0.1 mu m.
As a preferable scheme, the ultrafiltration membrane component 7 operates under pressureThe force is 40-80 kpa, the membrane flux is 30-50L/(m) 2 ·h)。
The membrane silk in the first-stage reverse osmosis membrane assembly 15 and the membrane silk in the second-stage reverse osmosis membrane assembly 20 all adopt dish tubular reverse osmosis membrane, and first-stage reverse osmosis membrane assembly 15 and second-stage reverse osmosis membrane assembly 20 all contain reverse osmosis membrane water inlet 41, reverse osmosis membrane water outlet 42, reverse osmosis membrane water outlet 43, the reverse osmosis membrane water outlet 43 of first-stage reverse osmosis membrane assembly 15 is connected to smooth whole liquid retrieval and utilization water tank 17, the reverse osmosis membrane water outlet 42 of first-stage reverse osmosis membrane assembly 15 is connected to first-stage water production tank 16, the reverse osmosis membrane water outlet 42 of second-stage reverse osmosis membrane assembly 20 is connected to desalted water retrieval and utilization water tank 22, the reverse osmosis membrane water outlet 43 of second-stage reverse osmosis membrane assembly 20 is connected to ultrafiltration water production tank 11.
Further, the water inlet pipeline, the water producing pipeline and the concentrated water pipeline of the first-stage reverse osmosis membrane assembly 15 and the second-stage reverse osmosis membrane assembly 20 are respectively provided with a flowmeter, a pressure gauge, a temperature sensor, an online conductivity meter and an online pH meter.
As one preferable example, the operation pressure of the first-stage reverse osmosis membrane component 15 is 1.5-3.0 Mpa, and the membrane flux is 10-11L/(m) 2 H), the operation pressure of the secondary reverse osmosis membrane component 20 is 1.5-2.0 Mpa, and the membrane flux is 9-11L/(m) 2 ·h)。
Example 2
Specific embodiments of the utility model are illustrated below.
The ultrafiltration membrane component 7 adopts an external pressure type hollow fiber membrane component with membrane wires with the outer diameter of 2mm, the inner diameter of 1mm, the aperture of 0.08 mu m and PTFE material, and the single-branch membrane area is 12m 2 The operating pressure is 40 to 50kpa; the primary reverse osmosis membrane assembly 15 and the secondary reverse osmosis membrane assembly 20 are disc-tube type reverse osmosis membrane assemblies, the operation pressure of the primary reverse osmosis membrane assembly 15 is controlled to be 2.0 Mpa-3.0 Mpa, the operation pressure of the secondary reverse osmosis membrane assembly 20 is controlled to be 1.5 Mpa-1.6 Mpa, flushing wastewater of a finishing machine of a certain cold rolling mill is selected as a treatment object, and the treatment results are shown in table 1.
TABLE 1 variation of conductivity in wastewater treatment
As can be seen from table 1, after the ultrafiltration membrane device, the primary reverse osmosis membrane device and the secondary reverse osmosis membrane device are sequentially processed, the water production conductivity of the secondary reverse osmosis membrane assembly 20 is less than 10 μs/cm, so that the water quality requirement of desalted water is met; the concentrated water conductivity of the first-stage reverse osmosis membrane assembly 15 can reach 500 mu s/cm, the use requirement of the finishing liquid (the recommended value of a finishing liquid manufacturer is 230 mu s/cm) is met, and the concentrated water of the first-stage reverse osmosis membrane assembly 15 collected by the finishing liquid recycling water tank 17 can be used as the finishing liquid which is finally recovered. Furthermore, the water inlet tank 1, the ultrafiltration water producing tank 11, the first-stage water producing tank 16, the finishing liquid recycling water tank 17 and the desalted water recycling water tank 22 of the membrane treatment device are respectively provided with liquid level gauges, and the ultrafiltration membrane component 7, the first-stage membrane reverse osmosis membrane component 15 and the second-stage reverse osmosis membrane component 20 and the aeration flow of the blower 6 are controlled through a frequency converter and a valve to ensure that the ultrafiltration membrane flux is maintained at 30L/(m) 2 ·h)～50L/(m 2 H), the flux of the reverse osmosis membrane is maintained at 10L/(m) 2 ·h)～12L/(m 2 H), controlling the concentration of the recovered finishing liquid by adjusting the conductivity of the concentrated water of the first-stage reverse osmosis membrane assembly 15 according to the using requirement of the finishing liquid. And each pipeline is provided with a flowmeter and a pressure gauge, and when the water flow rate is obviously reduced or the transmembrane pressure difference is obviously increased, the operation is stopped, and the membrane treatment device is cleaned.
It should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present utility model.
Claims (6)
1. A membrane treatment device for recovering a finishing liquid, comprising a water inlet tank (1), characterized in that: the water outlet of the water inlet tank (1) is connected with the water inlet pipe (8) sequentially through the ultrafiltration water inlet pump (2) and the water inlet valve (3), the air outlet pipe of the air blower (6) is connected with the water inlet pipe (8) through the air inlet valve (5), the water inlet pipe (8) is connected with the ultrafiltration membrane water inlet (31) of the ultrafiltration membrane component (7), the ultrafiltration membrane concentrated water port (33) of the ultrafiltration membrane component (7) is communicated to the water inlet of the water inlet tank (1) through the concentrated water pipe (9), and the ultrafiltration membrane water outlet (32) of the ultrafiltration membrane component (7) is communicated to the water inlet of the ultrafiltration water outlet tank (11) through the water outlet pipe (10);
the water outlet of the ultrafiltration water producing tank (11) is connected with a reverse osmosis membrane water inlet (41) of the first-stage reverse osmosis membrane assembly (15) sequentially through a first-stage water inlet pump (12) and a first-stage booster pump (13), a reverse osmosis membrane water producing port (42) of the first-stage reverse osmosis membrane assembly (15) is connected with a water inlet of the first-stage water producing tank (16), a reverse osmosis membrane concentrated port (43) of the first-stage reverse osmosis membrane assembly (15) is respectively connected with a finishing liquid recycling water tank (17) and a water inlet of the first-stage circulating pump (14), and a water outlet of the first-stage circulating pump (14) is connected with the reverse osmosis membrane water inlet (41) of the first-stage reverse osmosis membrane assembly (15);
the water outlet of the first-stage water production tank (16) is connected with a reverse osmosis membrane water inlet (41) of the second-stage reverse osmosis membrane assembly (20) sequentially through a second-stage water inlet pump (18) and a second-stage booster pump (19), a reverse osmosis membrane water production port (42) of the second-stage reverse osmosis membrane assembly (20) is connected with a desalted water recycling water tank (22), a reverse osmosis membrane concentrated water port (43) of the second-stage reverse osmosis membrane assembly (20) is connected with the ultrafiltration water production tank (11) and the water inlet of the second-stage circulating pump (21) respectively, and the water outlet of the second-stage circulating pump (21) is connected with the reverse osmosis membrane water inlet (41) of the second-stage reverse osmosis membrane assembly (20).
2. A membrane treatment device for recovering a polishing liquid as claimed in claim 1, wherein: the ultrafiltration membrane components (7) are multiple, the primary reverse osmosis membrane components (15) are multiple, and the secondary reverse osmosis membrane components (20) are multiple.
3. A membrane treatment device for recovering a polishing liquid as claimed in claim 1, wherein: the air outlet pipe of the blower (6) is also provided with a check valve and a flowmeter, and the water inlet pipe (8) is provided with an exhaust valve (4).
4. A membrane treatment device for recovering a polishing liquid as claimed in claim 1, wherein: and the water inlet pipe (8), the concentrated water pipe (9) and the water production pipe (10) are respectively provided with a flowmeter and a pressure gauge.
5. A membrane treatment device for recovering a polishing liquid as claimed in claim 1, wherein: the membrane wires in the ultrafiltration membrane component (7) are external pressure type hollow fiber membranes, the external pressure type hollow fiber membranes are made of PVDF or PTFE, and the membrane pore diameter of the external pressure type hollow fiber membranes is 0.05-0.1 mu m.
6. A membrane treatment device for recovering a polishing liquid as claimed in claim 1, wherein: the membrane filaments in the primary reverse osmosis membrane component (15) and the membrane filaments in the secondary reverse osmosis membrane component (20) are both disc-tube reverse osmosis membranes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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