CN112939150A - Full-automatic high-recovery-rate salt separation integrated system and method - Google Patents
Full-automatic high-recovery-rate salt separation integrated system and method Download PDFInfo
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- CN112939150A CN112939150A CN202010950718.2A CN202010950718A CN112939150A CN 112939150 A CN112939150 A CN 112939150A CN 202010950718 A CN202010950718 A CN 202010950718A CN 112939150 A CN112939150 A CN 112939150A
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- water
- reverse osmosis
- rate
- concentrated water
- osmosis membrane
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- 150000003839 salts Chemical class 0.000 title claims abstract description 33
- 238000000926 separation method Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 192
- 239000012528 membrane Substances 0.000 claims abstract description 78
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 57
- 238000001728 nano-filtration Methods 0.000 claims abstract description 48
- 238000011084 recovery Methods 0.000 claims abstract description 29
- 150000002500 ions Chemical class 0.000 claims abstract description 19
- 238000004140 cleaning Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims description 37
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 13
- 238000011001 backwashing Methods 0.000 claims description 11
- 230000035699 permeability Effects 0.000 claims description 6
- 239000000460 chlorine Substances 0.000 claims description 4
- 229910052801 chlorine Inorganic materials 0.000 claims description 4
- -1 chlorine ions Chemical class 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 9
- 238000011010 flushing procedure Methods 0.000 abstract description 4
- 239000013505 freshwater Substances 0.000 abstract description 3
- 238000002425 crystallisation Methods 0.000 abstract description 2
- 230000008025 crystallization Effects 0.000 abstract description 2
- 238000001704 evaporation Methods 0.000 abstract description 2
- 230000008020 evaporation Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 3
- 230000003204 osmotic effect Effects 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000909 electrodialysis Methods 0.000 description 2
- 238000009292 forward osmosis Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000003014 ion exchange membrane Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- RECVMTHOQWMYFX-UHFFFAOYSA-N oxygen(1+) dihydride Chemical compound [OH2+] RECVMTHOQWMYFX-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
Abstract
The invention provides a full-automatic high-recovery-rate salt separation integrated system and a method, which comprises a reverse osmosis membrane treatment process and a nanofiltration membrane process; the reverse osmosis membrane treatment process is provided with a water feeding pump, a security filter, a high-pressure pump, an intersegmental booster pump, a reverse osmosis membrane device, an intermediate water tank, a low-pressure flushing pump, a cleaning device, a conductivity meter, a flow transmitter and the like; the nanofiltration membrane process is provided with a water feeding pump, a cartridge filter, a high-pressure pump, an intersegmental booster pump, a nanofiltration membrane device, a fresh water tank, a conductivity meter, a flow transmitter and the like. The invention firstly ensures that the recovery rate of the system can reach the maximum and the discharged water amount is small; secondly, the system has high separation efficiency on monovalent and divalent ions, and the final evaporation crystallization product has high purity which can reach the secondary standard of industrial salt; finally, the system can realize automatic operation, and the personnel cost is reduced.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a full-automatic high-recovery-rate salt separation integrated system which is suitable for large, medium and small reclaimed water recycling treatment engineering, especially a wastewater zero-discharge engineering technology.
Background
For membrane concentration processes, several processes are currently on the market, including reverse osmosis membranes, electrodialysis, forward osmosis, and the like. The mechanism of the main desalting part of the reverse osmosis membrane is similar to that of a semipermeable membrane, the reverse osmosis membrane can have selective permeability on ions in water, and in a natural state, a semipermeable membrane (the reverse osmosis membrane) selectively permeates a solvent (water) from a low-concentration side to a high-concentration side to achieve natural osmotic balance under the condition of forming a certain osmotic pressure difference; when external pressure is applied to the high-concentration side, the solvent on the high-concentration side overcomes the natural osmotic pressure and the natural liquid level height difference, so that water molecules reversely permeate from the high-concentration side to the low-concentration side. The core of Electrodialysis (ED) technology is ion exchange membrane, the concentration limit can be increased to more than 20% of salt content, but the quality of produced water is high in investment and operation cost, and especially when the salt content of inlet water is low, the economy is poor, and the method is suitable for being adopted when the salt content is more than 2%. Forward Osmosis (FO) achieves concentrated water by providing a permselective membrane and a very high concentration draw solution to osmotically transfer moisture in high salinity waste to the draw solution, but the selection of the draw solution and the later operation costs are high. Therefore, the research of effectively improving the recovery rate of water, reducing the amount of discharged water of the system, improving the quality of discharged water and reducing the operation cost of the system has important significance. Aiming at a salt separation process, a nanofiltration technology is mainly adopted at present, and due to the fact that the resource utilization requirements are stronger and stronger at present, the requirements on zero discharge of wastewater are higher and higher, and the research on improving the purity of crystalline salt is of great significance. In view of the above, the reverse osmosis membrane and high recovery rate nanofiltration integrated process provided by the invention can effectively improve the system recovery rate and the purity of the crystallized salt.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a full-automatic high-recovery-rate salt separation integrated system. The system can achieve higher recovery rate and better salt separation effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a full-automatic high-recovery-rate salt separation integrated system comprises a reverse osmosis membrane treatment unit and a nanofiltration membrane treatment unit; the reverse osmosis membrane treatment unit comprises a reverse osmosis membrane device, a water inlet, a water production outlet and a concentrated water outlet of the reverse osmosis membrane device are respectively connected with a water inlet pipe, a water production pipe and a concentrated water pipe, a water inlet conductivity meter and a water inlet flow transmitter are arranged on the water inlet pipe, a water production conductivity meter and a water production flow transmitter are arranged on the water production pipe, and a concentrated water flow control valve, a concentrated water conductivity meter and a concentrated water flow transmitter are arranged on the concentrated water pipe; the nanofiltration membrane treatment unit comprises a nanofiltration membrane device, and a water inlet, a water production outlet and a concentrated water outlet of the nanofiltration membrane device are respectively connected with a water inlet pipe, a water production pipe and a concentrated water pipe; the water inlet pipe is provided with a water inlet chloride ion detector, and the water production pipe is provided with a water production conductivity meter, a water production chloride ion detector and a water production flow transmitter; the concentrated water pipe is provided with a concentrated water flow control valve, a concentrated water conductivity meter and a concentrated water flow transmitter; and a concentrated water pipe of the reverse osmosis membrane treatment system is communicated with a water inlet pipe of the nanofiltration membrane treatment unit.
Furthermore, the reverse osmosis membrane treatment unit comprises a reverse osmosis water supply pump, a reverse osmosis cartridge filter, a reverse osmosis high-pressure pump and a reverse osmosis membrane device which are connected in sequence.
Further, the nanofiltration membrane treatment unit comprises an intermediate water tank, a nanofiltration water feed pump, a nanofiltration cartridge filter, a nanofiltration high-pressure pump and a nanofiltration membrane device which are sequentially connected; the middle water tank is connected with the water production pipe of the reverse osmosis membrane treatment unit.
Further, still include belt cleaning device for wash reverse osmosis membrane device and receive filter membrane device.
Further, the device also comprises a back washing device which is used for back washing the reverse osmosis membrane device and the nanofiltration membrane device.
A full-automatic high-recovery-rate salt separation method comprises the following steps:
step 1: inputting the incoming water into a reverse osmosis membrane treatment unit, and collecting the water inlet conductivity, the water production conductivity, the concentrated water conductivity, the water inlet flow, the water production flow and the concentrated water flow; calculating the recovery rate according to the inflow rate, the produced water rate and the concentrated water flow rate, and adjusting a concentrated water flow control valve of the reverse osmosis device to control the recovery rate to be 60-75%; calculating the removal rate of salt according to the inlet water conductivity, the product water conductivity and the concentrated water conductivity, and if the removal rate does not meet the requirement, performing backwashing or cleaning on the reverse osmosis membrane treatment unit;
step 2: the produced water of the reverse osmosis membrane treatment unit is input into a nanofiltration membrane treatment unit, and the concentration of the chloride ions in the inlet water, the concentration of the chloride ions in the produced water, the conductivity of the concentrated water, the flow rate of the produced water and the flow rate of the concentrated water are collected; calculating the recovery rate according to the inflow, the production and the concentrated water flow, and adjusting a concentrated water flow control valve of the nanofiltration device to control the recovery rate to be 75-85%; and calculating the permeability of the system to monovalent ions according to the concentration of the chlorine ions in the inlet water and the concentration of the chlorine ions in the produced water, and further analyzing the separation efficiency of the monovalent ions and the divalent ions.
Has the advantages that:
(1) the recovery rate of the system can be effectively controlled, the recovery rate of the reverse osmosis membrane treatment process can be controlled to be 60-75%, and the recovery rate of the nanofiltration membrane treatment process can be controlled to be 75-85%.
(2) The separation effect on monovalent salt and divalent salt can be effectively controlled, the rejection rate of the nanofiltration membrane on MgSO4 can reach 98%, and the permeability on monovalent ion can reach 96% (based on chloride ion) (permeability is chlorine ion concentration in produced water/chlorine ion concentration in inlet water).
(3) The salt in water can be effectively removed, and the salt removal rate of the full-automatic high-recovery-rate salt separation integrated system can reach 97% or more.
(4) The system can realize the unattended operation state, is convenient to operate and maintain, and greatly saves labor and production cost.
Drawings
FIG. 1 is a schematic diagram of a reverse osmosis membrane treatment unit, FIG. 2 is a schematic diagram of a nanofiltration membrane treatment unit, and the full-automatic high-recovery salt separation integrated system is formed by combining the components shown in FIGS. 1 and 2.
In the figure: 1-reverse osmosis water supply pump, 2-reverse osmosis cartridge filter, 3-reverse osmosis high-pressure pump, 4-reverse osmosis membrane device, 5-reverse osmosis intersegmental booster pump, 6-intermediate water tank, 7-nanofiltration water supply pump, 8-nanofiltration cartridge filter, 9-nanofiltration high-pressure pump, 10-nanofiltration membrane device, 11-nanofiltration intersegmental booster pump, 12-fresh water tank, 13-low pressure flushing water pump, 14-cleaning device, 15-PLC control cabinet, other valves, instruments, pipelines and the like are other supporting facilities.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the reverse osmosis membrane treatment unit is provided with a reverse osmosis water inlet pump 1, a reverse osmosis cartridge filter 2, a reverse osmosis high-pressure pump 3, a reverse osmosis membrane device 4, a water inlet conductivity meter, a water production conductivity meter, a water inlet, concentrated water and water production flow transmitter, a concentrated water flow control valve, a water production discharge valve, a concentrated water discharge valve and the like.
The reverse osmosis high-pressure pump 3 is set for variable frequency starting, flow regulation can be carried out according to the temperature and the water quality of incoming water, low-pressure flushing can be automatically carried out when the equipment is stopped or runs for a period of time, and the low-pressure flushing time can be controlled within 5-20 min according to the running condition; the recovery rate of the system is adjusted according to the conductivity of inlet water, a concentrated water flow adjusting valve and a flow transmitter are arranged on the concentrated water side, the recovery rate can be automatically adjusted, and the recovery rate can be controlled to be 60-75%. The removal rate of the system to salt can be calculated through the conductivity of the inlet water, the produced water and the concentrated water, and if the removal rate does not meet the requirement, the system automatically performs backwashing or cleaning through PLC control. The system water inlet flow is the water production flow and the concentrated water flow, the recovery rate is the water production flow/the water inlet flow, and the recovery rate can be controlled by adjusting the concentrated water flow under the condition of constant water inlet flow.
As shown in fig. 2, the nanofiltration membrane treatment unit comprises an intermediate water tank 6, a nanofiltration water feed pump 7, a nanofiltration cartridge filter 8, a nanofiltration high-pressure pump 9, a nanofiltration membrane device 10, a fresh water tank 12, a conductivity meter, a flow transmitter, a concentrated water flow control valve, a produced water discharge valve, a concentrated water discharge valve, a chlorine ion detector, and the like. The recovery rate can be automatically adjusted by the concentrated water flow regulating valve and the flow transmitter, and can be controlled to be 75-85%. Through the water inlet and water production chloride ion detector, the permeability of the system to monovalent ions can be calculated, and then the separation efficiency of the monovalent ions and divalent ions is analyzed. Nanofiltration membranes are mainly used to separate monovalent ions and divalent ions, and therefore the rejection rate, i.e., separation efficiency, of monovalent ions and divalent ions is of interest.
The backwashing device comprises a backwashing water pump 13, a water inlet of the backwashing water pump 13 is connected with the middle water tank 6, and a water outlet of the backwashing water pump is connected with water inlets of the reverse osmosis membrane device 4 and the nanofiltration membrane device 10.
The cleaning device comprises a cleaning water pump and a solution tank filled with cleaning solution, the water inlet of the cleaning water pump is connected with the solution tank, and the water outlet of the cleaning water pump is connected with the water inlets of the reverse osmosis membrane device 4 and the nanofiltration membrane device 10.
TDS concentration and other chemical components of the system feed can affect the flux and operating pressure of the system membranes, as well as affect the recovery rate of the system and the separation efficiency of monovalent and divalent ions. The higher TDS feed will have lower recovery at the same operating pressure; magnesium ions with certain concentration are beneficial to the interception of sulfate ions, and the separation efficiency of univalent and divalent ions can be improved.
In summary, the wastewater treatment in the embodiment adopts a full-automatic high-recovery-rate salt separation integrated system, so that the system recovery rate is improved, and the amount of discharged water is reduced; secondly, the system has high separation efficiency on monovalent and divalent ions, and the final evaporation crystallization product has high purity which can reach the secondary standard of industrial salt; finally, the system can realize automatic operation, and the personnel cost is reduced. The full-automatic high-recovery-rate salt separation integrated system disclosed by the invention is suitable for large, medium and small reclaimed water recycling treatment projects, in particular to waste water zero discharge projects.
The above examples are merely illustrative of the embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. A full-automatic high-recovery-rate salt separation integrated system is characterized by comprising a reverse osmosis membrane treatment unit and a nanofiltration membrane treatment unit; the reverse osmosis membrane treatment unit comprises a reverse osmosis membrane device, a water inlet, a water production outlet and a concentrated water outlet of the reverse osmosis membrane device are respectively connected with a water inlet pipe, a water production pipe and a concentrated water pipe, a water inlet conductivity meter and a water inlet flow transmitter are arranged on the water inlet pipe, a water production conductivity meter and a water production flow transmitter are arranged on the water production pipe, and a concentrated water flow control valve, a concentrated water conductivity meter and a concentrated water flow transmitter are arranged on the concentrated water pipe; the nanofiltration membrane treatment unit comprises a nanofiltration membrane device, and a water inlet, a water production outlet and a concentrated water outlet of the nanofiltration membrane device are respectively connected with a water inlet pipe, a water production pipe and a concentrated water pipe; the water inlet pipe is provided with a water inlet chloride ion detector, and the water production pipe is provided with a water production conductivity meter, a water production chloride ion detector and a water production flow transmitter; the concentrated water pipe is provided with a concentrated water flow control valve, a concentrated water conductivity meter and a concentrated water flow transmitter; and a concentrated water pipe of the reverse osmosis membrane treatment system is communicated with a water inlet pipe of the nanofiltration membrane treatment unit.
2. The full-automatic high-recovery salt separation integrated system according to claim 1, wherein the reverse osmosis membrane treatment unit comprises a reverse osmosis feed pump, a reverse osmosis cartridge filter, a reverse osmosis high-pressure pump and a reverse osmosis membrane device which are connected in sequence.
3. The full-automatic high-recovery-rate salt separation integrated system according to claim 2, wherein the nanofiltration membrane treatment unit comprises an intermediate water tank, a nanofiltration water feed pump, a nanofiltration cartridge filter, a nanofiltration high-pressure pump and a nanofiltration membrane device which are connected in sequence; the middle water tank is connected with the water production pipe of the reverse osmosis membrane treatment unit.
4. The full-automatic high-recovery salt separation integrated system according to claim 1, further comprising a cleaning device for cleaning the reverse osmosis membrane device and the nanofiltration membrane device.
5. The full-automatic high-recovery salt separation integrated system according to claim 3, further comprising a back washing device for back washing the reverse osmosis membrane device and the nanofiltration membrane device.
6. A full-automatic high-recovery-rate salt separation method is characterized by comprising the following steps:
step 1: inputting the incoming water into a reverse osmosis membrane treatment unit, and collecting the water inlet conductivity, the water production conductivity, the concentrated water conductivity, the water inlet flow, the water production flow and the concentrated water flow; calculating the recovery rate according to the inflow rate, the produced water rate and the concentrated water flow rate, and adjusting a concentrated water flow control valve of the reverse osmosis device to control the recovery rate to be 60-75%; calculating the removal rate of salt according to the inlet water conductivity, the product water conductivity and the concentrated water conductivity, and if the removal rate does not meet the requirement, performing backwashing or cleaning on the reverse osmosis membrane treatment unit;
step 2: the produced water of the reverse osmosis membrane treatment unit is input into a nanofiltration membrane treatment unit, and the concentration of the chloride ions in the inlet water, the concentration of the chloride ions in the produced water, the conductivity of the concentrated water, the flow rate of the produced water and the flow rate of the concentrated water are collected; calculating the recovery rate according to the inflow, the production and the concentrated water flow, and adjusting a concentrated water flow control valve of the nanofiltration device to control the recovery rate to be 75-85%; and calculating the permeability of the system to monovalent ions according to the concentration of the chlorine ions in the inlet water and the concentration of the chlorine ions in the produced water, and further analyzing the separation efficiency of the monovalent ions and the divalent ions.
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| CN202010950718.2A CN112939150A (en) | 2020-09-11 | 2020-09-11 | Full-automatic high-recovery-rate salt separation integrated system and method |
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| CN202010950718.2A CN112939150A (en) | 2020-09-11 | 2020-09-11 | Full-automatic high-recovery-rate salt separation integrated system and method |
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2020
- 2020-09-11 CN CN202010950718.2A patent/CN112939150A/en active Pending
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| JP2011056412A (en) * | 2009-09-10 | 2011-03-24 | Toshiba Corp | Membrane filtration system |
| CN101935111A (en) * | 2010-08-26 | 2011-01-05 | 宝钢工程技术集团有限公司 | Wastewater recycling preparation system with low energy consumption |
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Application publication date: 20210611 |