CN216549952U - System for promoting nanofiltration recovery rate under high-salinity water - Google Patents
System for promoting nanofiltration recovery rate under high-salinity water Download PDFInfo
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- CN216549952U CN216549952U CN202123438084.1U CN202123438084U CN216549952U CN 216549952 U CN216549952 U CN 216549952U CN 202123438084 U CN202123438084 U CN 202123438084U CN 216549952 U CN216549952 U CN 216549952U
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Abstract
The utility model discloses a system for improving nanofiltration recovery rate under high-salinity water, which comprises: an ultrafiltration water purification tank; the water inlet of the reverse osmosis device is connected with the water outlet of the ultrafiltration clear water tank through a first pipeline, an ultrafiltration water supply pump is arranged at the position of the water outlet of the ultrafiltration clear water tank on the first pipeline, and a high-pressure pump is arranged at the position of the water inlet of the reverse osmosis device; the nanofiltration device is characterized in that a water inlet of the nanofiltration device is connected with a water outlet of the reverse osmosis device through a second pipeline, a nanofiltration booster pump is arranged on the second pipeline, strong brine of the nanofiltration device is connected with a strong brine tank through a third pipeline, and nanofiltration produced water of the nanofiltration device is connected with a water inlet of the ultrafiltration water purification tank through a water return pipe. The nanofiltration booster pump is arranged on the second pipeline, so that higher water inlet pressure can be provided for the nanofiltration device, the recovery rate of the nanofiltration device can be improved, and the yield of strong brine of the nanofiltration device is reduced.
Description
Technical Field
The utility model relates to the technical field of sewage treatment nanofiltration devices, in particular to a system for improving nanofiltration recovery rate under high-salt water.
Background
The nanofiltration device in the sewage treatment is mainly used for treating the concentrated water produced by the first-stage reverse osmosis second-stage to improve the recovery rate of water and reduce the discharge amount of concentrated wastewater, and the originally designed water yield and concentrated water yield of a single set of nanofiltration device are respectively 25m3The recovery rate is 50 percent. Because the quality of the incoming water is greatly changed in zero discharge of sewage, when the quality of the incoming water is poor, the salt content (conductivity) of the primary reverse osmosis incoming water is increased, the salt content of the incoming water of the nanofiltration device is increased, the water inlet pressure of the nanofiltration device is from the primary reverse osmosis high-pressure pump, under the condition that the normal water yield of reverse osmosis is ensured, the water inlet pressure of the nanofiltration device is only increased to about 0.9MPa by increasing the water inlet pressure of the primary reverse osmosis, the recovery rate of the nanofiltration device can only reach about 20 percent at the moment, and if the water inlet pressure of the nanofiltration device is increased, the yield of the primary reverse osmosis secondary concentrated water is reduced, so that the safe operation of a reverse osmosis system is influenced.
Therefore, the technical problem to be solved by the present invention is how to provide a system for increasing the recovery rate of nanofiltration device under high saline water, which can increase the recovery rate of nanofiltration device and reduce the yield of strong saline water of nanofiltration device under the condition of high salt content of nanofiltration inlet water.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model provides a system for improving the nanofiltration recovery rate under high-salinity water, which can improve the recovery rate of a nanofiltration device and reduce the yield of strong brine of the nanofiltration device under the condition of high salt content of nanofiltration inlet water.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a system for enhancing nanofiltration recovery under high salinity water, comprising:
an ultrafiltration water purification tank;
the water inlet of the reverse osmosis device is connected with the water outlet of the ultrafiltration clear water tank through a first pipeline, an ultrafiltration water supply pump is arranged at the position of the water outlet of the ultrafiltration clear water tank on the first pipeline, and a high-pressure pump is arranged at the position of the water inlet of the reverse osmosis device;
the nanofiltration device is characterized in that a water inlet of the nanofiltration device is connected with a water outlet of the reverse osmosis device through a second pipeline, a nanofiltration booster pump is arranged on the second pipeline, strong brine of the nanofiltration device is connected with a strong brine tank through a third pipeline, and nanofiltration produced water of the nanofiltration device is connected with a water inlet of the ultrafiltration purified water tank through a return water pipe.
According to the technical scheme, compared with the prior art, the system for improving the nanofiltration recovery rate under the high-salt water is provided, the nanofiltration booster pump is arranged on the second pipeline, so that higher water inlet pressure can be provided for the nanofiltration device, the recovery rate of the nanofiltration device can be improved, and the yield of strong brine of the nanofiltration device can be reduced.
Further, the reverse osmosis apparatus comprises:
the water inlet of the first-stage reverse osmosis first-stage device is connected with the first pipeline, and the permeate produced water of the first-stage reverse osmosis first-stage device is connected with the soft water pool through a fourth pipeline;
the concentrated water of the first-stage reverse osmosis two-stage device is connected with the water inlet of the first-stage reverse osmosis two-stage device through a fifth pipeline, the water produced by the permeation of the first-stage reverse osmosis two-stage device is connected with the fourth pipeline through a sixth pipeline, and the concentrated water of the first-stage reverse osmosis two-stage device is connected with the water inlet of the nanofiltration device through the second pipeline.
The beneficial effect that adopts above-mentioned technical scheme to produce is that, the first-stage reverse osmosis first stage device and the second stage device of first-stage reverse osmosis can improve the throughput of sewage.
Furthermore, a first scale inhibitor dosing pipe is arranged on the second pipeline and at the position of a water inlet of the nanofiltration booster pump.
The beneficial effect that adopts above-mentioned technical scheme to produce is, can select suitable antisludging agent according to quality of water, slow down nanofiltration device scale deposit risk.
Furthermore, a first hydrochloric acid dosing pipe is arranged on the second pipeline and at the position of a water inlet of the nanofiltration booster pump.
The technical scheme has the beneficial effects that the pH value of the nanofiltration inlet water is finely adjusted to be about 6.3-6.5, and the scaling risk of the nanofiltration device is reduced.
Furthermore, a cartridge filter is arranged on the first pipeline at the position of the ultrafiltration water supply pump and the high-pressure pump.
Adopt the beneficial effect that above-mentioned technical scheme produced to be, filter the water that ultrafiltration clean water reservoir flows, slow down reverse osmosis membrane's dirt and block up, improve sewage treatment effect.
Furthermore, a second scale inhibitor dosing pipe is arranged on the first pipeline and positioned between the ultrafiltration water supply pump and the cartridge filter.
The beneficial effect that adopts above-mentioned technical scheme to produce is, reduces reverse osmosis unit scale deposit risk.
Furthermore, a second hydrochloric acid dosing pipe is arranged on the first pipeline and positioned between the ultrafiltration water supply pump and the security filter.
Adopt the beneficial effect that above-mentioned technical scheme produced to be, adjust the pH value of water in the pipeline, reduce reverse osmosis unit scale deposit risk.
Furthermore, a reducing agent dosing pipe is arranged on the first pipeline and positioned between the ultrafiltration water supply pump and the cartridge filter.
The beneficial effect that adopts above-mentioned technical scheme to produce is, eliminate the aquatic residual chlorine, avoids reverse osmosis unit and ultrafiltration device in the membrane oxidation.
Furthermore, pressure sensors are arranged on the second pipeline and at the positions of the inlet and the outlet of the nanofiltration booster pump.
The technical scheme has the beneficial effects that the pressure parameters of the inlet and the outlet of the nanofiltration booster pump can be conveniently recorded and observed in real time, and the automatic control of the nanofiltration booster pump can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a system for improving nanofiltration recovery rate under high-salt water provided by the utility model.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the embodiment of the utility model discloses a system for improving nanofiltration recovery rate under high-salinity water, comprising:
an ultrafiltration water purification tank 1;
a water inlet of the reverse osmosis device 2 is connected with a water outlet of the ultrafiltration clear water tank 1 through a first pipeline 3, an ultrafiltration water supply pump 4 is arranged at the position of the water outlet of the ultrafiltration clear water tank 1 on the first pipeline 3, and a high-pressure pump 5 is arranged at the position of the water inlet of the reverse osmosis device 2;
the nanofiltration device 6 is characterized in that a water inlet of the nanofiltration device 6 is connected with a water outlet of the reverse osmosis device 2 through a second pipeline 7, a nanofiltration booster pump 8 is arranged on the second pipeline 7, strong brine of the nanofiltration device 6 is connected with a strong brine tank 10 through a third pipeline 9, and nanofiltration produced water of the nanofiltration device 6 is connected with a water inlet of the ultrafiltration pure water tank 1 through a water return pipe 11.
The reverse osmosis apparatus 2 includes:
the water inlet of the first-stage reverse osmosis first-stage device 21 is connected with the first pipeline 3, and the permeate produced water of the first-stage reverse osmosis first-stage device 21 is connected with the soft water tank 13 through the fourth pipeline 12;
the concentrated water of the first-stage reverse osmosis second-stage device 22 is connected with the water inlet of the first-stage reverse osmosis second-stage device 22 through a fifth pipeline 14, the permeation produced water of the first-stage reverse osmosis second-stage device 22 is connected with a fourth pipeline 12 through a sixth pipeline 15, and the concentrated water of the first-stage reverse osmosis second-stage device 22 is connected with the water inlet of the nanofiltration device 6 through a second pipeline 7.
A first scale inhibitor dosing pipe 16 is arranged on the second pipeline 7 and at the position of the water inlet of the nanofiltration booster pump 8.
A first hydrochloric acid dosing pipe 17 is arranged on the second pipeline 7 and at the position of the water inlet of the nanofiltration booster pump 8.
A cartridge filter 18 is arranged on the first pipeline 3 at the position of the ultrafiltration water supply pump 4 and the high-pressure pump 5.
A second scale inhibitor feeding pipe 19 is arranged on the first pipeline 3 at the position of the ultrafiltration water supply pump 4 and the cartridge filter 18.
A second hydrochloric acid dosing pipe 20 is arranged on the first pipeline 3 at the position of the ultrafiltration water supply pump 4 and the cartridge filter 18.
A reducing agent dosing pipe 23 is arranged on the first pipeline 3 at the position of the ultrafiltration water supply pump 4 and the cartridge filter 18.
And pressure sensors 24 are arranged on the second pipeline 7 and at the positions of the inlet and the outlet of the nanofiltration booster pump 8.
The water is lifted by the ultrafiltration water supply pump, after reducing agents, scale inhibitors, hydrochloric acid and other agents are added at the outlet of the ultrafiltration water supply pump, the water is pumped to the first-stage reverse osmosis first-stage device by the high-pressure pump, the concentrated water of the first-stage reverse osmosis first-stage device is used as the inlet water and enters the first-stage reverse osmosis second-stage device, the concentrated water of the first-stage reverse osmosis second-stage device is used as the inlet water and enters the nanofiltration device, and the concentrated water of the nanofiltration device enters the concentrated salt water tank.
The nanofiltration field implementation is as follows:
comparison table for operating conditions of nanofiltration device
Firstly, as shown in the data in the table 1, when the water quality is normal (the electrical conductivity of the nanofiltration inlet water is about 6000 mus/cm) and the dosing and control parameters of the reverse osmosis system are normal, the first-stage reverse osmosis second-stage concentrated water directly enters the nanofiltration device, the inlet water pressure of the nanofiltration device is about 0.6MPa, the inlet water PH of the nanofiltration device is 6.5-7.5, and the water yield of the nanofiltration device can reach the designed water yield of 25m3The recovery rate can also reach 50 percent of the designed recovery rate;
secondly, as shown in the data in the table 2, when the quality of inlet water is poor (the electrical conductivity of the nanofiltration inlet water reaches 11000 mu s/cm), under the condition of ensuring the normal operation of the reverse osmosis system, the inlet water pressure of the nanofiltration device can only be increased to 0.9MPa by closing down the nanofiltration concentrated water, and the nanofiltration water yield is only 10m3The recovery rate is only 20%, and the nanofiltration device can rise by 0.1MPa when running for 360 hours, and the fouling and plugging speed is high;
thirdly, as shown in the data of the above table 3, when the quality of the inlet water is poor (the electrical conductivity of the inlet water for nanofiltration reaches 11000 mus/cm), only one nanofiltration booster pump is added to the inlet water pipeline (the second pipeline) for nanofiltration, hydrochloric acid and antisludging agent are not added for dosing, but the pressure of the inlet water of the nanofiltration device is increased by the nanofiltration booster pump, under the condition of ensuring normal water production of reverse osmosis, the pressure of the inlet water of the nanofiltration device can be increased to 1.1MPa, and the water yield of the nanofiltration device can be increased to 25m3The recovery rate can reach 50%, but the pressure difference can rise by 0.1MPa after the nanofiltration device operates for 480 hours, so that the recovery rate is improved, but the defect that the pressure difference rises quickly in actual production still exists;
as shown in the data in the table 4, when the inlet water quality is poor (the nano-filtration inlet water conductivity reaches 11000 mu s/cm), the nano-filtration booster pump is added in the nano-filtration inlet pipeline (the second pipeline), meanwhile, the inlet pipeline of the nano-filtration booster pump is added with hydrochloric acid for adding medicine and antisludging agent for adding medicine, the PH of the nano-filtration inlet water is controlled to be 6.3-6.5,under the condition of ensuring normal water production of the primary reverse osmosis, the water inlet pressure of the nanofiltration device can reach 1.1MPa, and the nanofiltration water yield can reach 25m3The recovery rate can reach 50 percent, and the nanofiltration device operates for 720 hours, the pressure difference rises by 0.1MPa, and the difference is not great compared with the water quality condition. Therefore, the system solves the problem of low recovery rate of the nanofiltration device under the condition that the inlet water is high-salinity water.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A system for promoting nanofiltration recovery rate under high-salinity water is characterized by comprising:
an ultrafiltration clear water tank (1);
the water inlet of the reverse osmosis device (2) is connected with the water outlet of the ultrafiltration water purification tank (1) through a first pipeline (3), an ultrafiltration water supply pump (4) is arranged at the position, located at the water outlet of the ultrafiltration water purification tank (1), on the first pipeline (3), and a high-pressure pump (5) is arranged at the position, located at the water inlet of the reverse osmosis device (2);
nanofiltration device (6), the water inlet of nanofiltration device (6) pass through second pipeline (7) with the delivery port of reverse osmosis unit (2) is connected, be equipped with on second pipeline (7) and receive and strain booster pump (8), the strong brine of nanofiltration device (6) passes through third pipeline (9) and connects strong brine pond (10), receive and strain that nanofiltration device (6) produce water pass through wet return (11) with the water inlet of ultrafiltration water purification pond (1) is connected.
2. The system for enhancing nanofiltration recovery under high salinity water according to claim 1, wherein the reverse osmosis device (2) comprises:
a first-stage reverse osmosis first-stage device (21), wherein a water inlet of the first-stage reverse osmosis first-stage device (21) is connected with the first pipeline (3), and the permeate produced water of the first-stage reverse osmosis first-stage device (21) is connected with the soft water pool (13) through a fourth pipeline (12);
one-level reverse osmosis two-stage device (22), the dense water of one-level reverse osmosis one-stage device (21) pass through fifth pipeline (14) with the water inlet of one-level reverse osmosis two-stage device (22) is connected, the infiltration of one-level reverse osmosis two-stage device (22) produce water pass through sixth pipeline (15) with fourth pipeline (12) are connected, the dense water of one-level reverse osmosis two-stage device (22) passes through second pipeline (7) with the water inlet of nanofiltration device (6) is connected.
3. The system for improving the nanofiltration recovery rate under the high-salinity water according to claim 1, wherein a first scale inhibitor feeding pipe (16) is arranged on the second pipeline (7) and at the position of the water inlet of the nanofiltration booster pump (8).
4. The system for improving the nanofiltration recovery rate under the high-salinity water according to claim 3, wherein a first hydrochloric acid feeding pipe (17) is arranged on the second pipeline (7) and at the position of the water inlet of the nanofiltration booster pump (8).
5. The system for improving the recovery rate of nanofiltration under high-salinity water according to claim 1, wherein a cartridge filter (18) is arranged on the first pipeline (3) at the position of the ultrafiltration water supply pump (4) and the high-pressure pump (5).
6. The system for improving the nanofiltration recovery rate under the high-salinity water according to claim 5, wherein a second scale inhibitor feeding pipe (19) is arranged on the first pipeline (3) at the position of the ultrafiltration water supply pump (4) and the cartridge filter (18).
7. The system for improving the recovery rate of nanofiltration of claim 6, wherein a second hydrochloric acid feeding pipe (20) is arranged on the first pipeline (3) at the position of the ultrafiltration water supply pump (4) and the cartridge filter (18).
8. The system for improving the recovery rate of nanofiltration of claim 7, wherein a reducing agent feeding pipe (23) is arranged on the first pipeline (3) at the position of the ultrafiltration water supply pump (4) and the cartridge filter (18).
9. The system for improving the nanofiltration recovery rate under high saline water according to any one of claims 1 to 8, wherein the second pipeline (7) is provided with a pressure sensor (24) at the inlet and outlet of the nanofiltration booster pump (8).
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| CN202123438084.1U CN216549952U (en) | 2021-12-31 | 2021-12-31 | System for promoting nanofiltration recovery rate under high-salinity water |
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| CN202123438084.1U CN216549952U (en) | 2021-12-31 | 2021-12-31 | System for promoting nanofiltration recovery rate under high-salinity water |
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