DTRO salt separation device with heating function for wastewater ZLD process

Abstract

The utility model discloses a DTRO (Disk Tubular Reverse Osmosis) salt separation device with a heating function for a waste water ZLD (Zinc Like Disk) process, and aims to provide the DTRO salt separation device with the heating function, which is characterized by comprising a feeding device, an outlet of the feeding device is connected with a delivery pump, the delivery pump is also provided with a heating system, and the heating system is connected with a water inlet of the feeding device. The heating system comprises a security filter connected with the delivery pump, the security filter is connected with a heating tank, an outlet of the heating tank is connected with a high-pressure pump, and the high-pressure pump is further connected with a DTRO salt separation membrane system.

Description

Technical Field

[0001] The utility model relates to the field of separation devices, in particular to a DTRO salt separation device with a heating function used in a wastewater ZLD process. Background Art

[0002] Generally, for wastewater biochemical treatment, high-salt wastewater refers to wastewater containing organic matter and at least a total dissolved solids (TDS) mass fraction greater than 3.5%. Because in this type of wastewater, in addition to organic pollutants, it also contains a large amount of soluble inorganic salts, such as Cl-, Na+, SO42-, Ca2+, etc. Therefore, this type of wastewater is generally the limit of biochemical treatment. In addition to seawater desalination, this type of wastewater mainly comes from the following areas: ① Chemical production, incomplete chemical reactions or chemical reaction by-products, especially a large amount of high COD, high-salt toxic wastewater produced in the production process of chemical products such as dyes and pesticides; ② Wastewater treatment, in the wastewater treatment process, the mineralization brought about by the addition of water treatment agents and acids and alkalis, as well as the concentrate produced by the recovery of most "fresh" water, will increase the concentration of soluble salts, forming the so-called "high-salinity wastewater" that is difficult to biochemically treat. It can be seen that this type of salt-containing wastewater is more polluting to the environment than ordinary wastewater.

[0003] At present, a Chinese patent with publication number CN220976617U discloses a low-energy consumption and low-pollution DTRO device with segmented large reflux, which includes a first-stage DTRO unit and a second-stage DTRO unit, wherein the first-stage DTRO unit is connected to a first-stage DTRO water inlet pipeline and a first-stage DTRO concentrate pipeline, the first-stage DTRO water inlet pipeline is connected to an energy recovery high-pressure pump, the second-stage DTRO unit is connected to a second-stage DTRO water inlet pipeline and a second-stage DTRO concentrate pipeline, the first-stage DTRO concentrate pipeline is connected to the second-stage DTRO water inlet pipeline through an inter-stage booster pump, and the second-stage DTRO concentrate pipeline is connected to the high-pressure concentrate inlet of the energy recovery high-pressure pump.

[0004] Although this type of low-energy consumption and low-pollution DTRO device with segmented large reflux can significantly reduce membrane pollution, recover the energy of high-pressure concentrated water, and achieve an effective balance of water production between the first and second DTRO units by setting segmented large reflux, high-pressure pumps with energy recovery, and inter-stage booster pumps, the conventional DTRO salt separation device has no heating device and operates at room temperature. Under this condition, it is suitable for the operation of mixed salt systems with sodium chloride as the main body, but not for the operation of mixed salt systems with sodium sulfate as the main body. Summary of the invention

[0005] The utility model aims to provide a DTRO salt separation device with a heating function for a wastewater ZLD process, which has the advantages of making the DTRO salt separation device have a greater sodium sulfate tolerance in a sodium sulfate-sodium chloride-water ternary system, making the DTRO membrane less prone to clogging, and improving the concentration multiple.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A DTRO salt separation device with heating function for wastewater ZLD process, comprising a feeding device, wherein the outlet of the feeding device is connected to a delivery pump, the delivery pump is also provided with a heating system, the heating system comprises a safety filter connected to the delivery pump, the safety filter is connected to a heating tank, the outlet of the heating tank is connected to a high-pressure pump, and the high-pressure pump is also connected to a DTRO salt separation membrane system.

[0008] It is further configured that the feeding device comprises a raw liquid tank, the raw liquid tank is connected to a sedimentation tank, and the sedimentation tank is connected to a delivery pump.

[0009] It is further configured that the outlet of the DTRO salt separation membrane system is respectively connected to a sodium chloride evaporator and a sodium sulfate evaporator.

[0010] It is further configured that: the safety filter is connected to the high-pressure pump, and a control valve is also provided between the safety filter and the high-pressure pump.

[0011] Further configuration: a temperature sensor is also provided between the high pressure pump and the DTRO salt separation membrane system.

[0012] Preferably, a filter screen is provided between the sedimentation tank and the delivery pump.

[0013] In summary, the utility model has the following beneficial effects: by adding a heating module in the DTRO salt separation device, the DTRO mixing system is changed from a normal temperature operation state to a heating operation state, and the temperature of the mixed salt system is raised to 40°C. Under this condition, the limit sodium sulfate concentration is about 33%, and the normal concentration is 29%. At the same time, the scale of the subsequent sodium sulfate evaporator is also reduced, saving the investment in evaporation equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings.

[0015] Figure 1 This is the overall flow chart of the DTRO salt separation device with heating function used in the ZLD process of wastewater.

[0016] In the figure, 1. feeding device; 11. raw liquid tank; 12. sedimentation tank; 2. delivery pump; 3. heating system; 31. safety filter; 32. heating tank; 33. high-pressure pump; 4. DTRO salt separation membrane system; 5. sodium chloride evaporator; 6. sodium sulfate evaporator; 7. control valve; 8. temperature sensor; 9. filter. DETAILED DESCRIPTION

[0017] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.

[0018] The technical solution adopted by the utility model is:

[0019] A DTRO salt separation device with heating function for wastewater ZLD process, such as Figure 1 As shown, it includes a feeding device 1, the outlet of the feeding device 1 is connected to a delivery pump 2, the feeding device 1 includes a raw liquid tank 11, a sedimentation tank 12 is connected to the raw liquid tank 11, and the sedimentation tank 12 is connected to the delivery pump 2, a filter screen 9 is also provided between the sedimentation tank 12 and the delivery pump 2, and a heating system 3 is also provided on the delivery pump 2, the heating system 3 includes a safety filter 31 connected to the delivery pump 2, the safety filter 31 is connected to a heating tank 32, the outlet of the heating tank 32 is connected to a high-pressure pump 33, and the high-pressure pump 33 is also connected to a DTRO salt separation membrane system 4.

[0020] The DTRO salt separation membrane system 4 is connected to the sodium chloride evaporator 5 and the sodium sulfate evaporator 6 at the DTRO outlet, and the security filter 31 is connected to the high-pressure pump 33. A control valve 7 is also provided between the security filter 31 and the high-pressure pump 33. The DTRO salt separation membrane system 4 is connected to the sodium chloride evaporator 5 and the sodium sulfate evaporator 6 at the DTRO outlet, and a temperature sensor 8 is also provided between the high-pressure pump 33 and the DTRO salt separation membrane system 4.

[0021] Its main working principle is as follows: as sodium chloride passes through the DTRO membrane, sodium sulfate on the concentrated water side is continuously enriched and the concentration is continuously increased. Under normal temperature conditions, the limit sodium sulfate concentration is about 19%, and the normal concentration is 15%. If the concentration continues, the DTRO membrane will be blocked and the concentration multiple will not be high. Under such working conditions, for a mixed salt system with sodium sulfate as the main body, it is easy to cause sodium sulfate crystallization on the concentrated water side. The sodium sulfate concentration is greater than 15%, causing DTRO membrane blockage. By adding a heating module in the DTRO salt separation device, the DTRO mixed salt system is changed from a normal temperature operation state to a heating operation state, and the temperature of the mixed salt system is raised to 40°C. The operating temperature of the mixed salt system shall not exceed the normal operating temperature of the DTRO membrane of 50°C. Under this condition, the limit sodium sulfate concentration is about 33%, and the normal concentration is 29%. At the same time, the scale of the subsequent sodium sulfate evaporator 6 is reduced, saving the investment in evaporation equipment. At the same time, the sedimentation tank 12 and the filter screen 9 can effectively filter out impurities and crystals in the original solution at the beginning. At the same time, the control valve 7 can be used normally when the heating system 3 is repaired.

[0022] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the utility model.

Claims

1. A DTRO salt separation device with heating function for wastewater ZLD process, comprising a feeding device (1), characterized in that: The outlet of the feeding device (1) is connected to a delivery pump (2), and the delivery pump (2) is also provided with a heating system (3). The heating system (3) comprises a safety filter (31) connected to the delivery pump (2), and the safety filter (31) is connected to a heating tank (32). The outlet of the heating tank (32) is connected to a high-pressure pump (33), and the high-pressure pump (33) is also connected to a DTRO salt separation membrane system (4).

2. A DTRO salt separation device with heating function for wastewater ZLD process according to claim 1, characterized in that: The feeding device (1) comprises a raw liquid tank (11), the raw liquid tank (11) is connected to a sedimentation tank (12), and the sedimentation tank (12) is connected to a delivery pump (2).

3. A DTRO salt separation device with heating function for wastewater ZLD process according to claim 2, characterized in that: The outlet of the DTRO salt separation membrane system (4) is respectively connected to a sodium chloride evaporator (5) and a sodium sulfate evaporator (6).

4. A DTRO salt separation device with heating function for wastewater ZLD process according to claim 3, characterized in that: The safety filter (31) is connected to the high-pressure pump (33), and a control valve (7) is provided between the safety filter (31) and the high-pressure pump (33).

5. A DTRO salt separation device with heating function for wastewater ZLD process according to claim 4, characterized in that: A temperature sensor (8) is also provided between the high-pressure pump (33) and the DTRO salt separation membrane system (4).

6. A DTRO salt separation device with heating function for wastewater ZLD process according to claim 5, characterized in that: A filter screen (9) is also provided between the sedimentation tank (12) and the delivery pump (2).

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