Reaction device for removing total organic carbon in nanofiltration membrane strong brine

Abstract

The utility model discloses a reaction device for removing total organic carbon in nanofiltration membrane strong brine. The device mainly comprises a steam-water mixing module, an ultraviolet reaction module and a water storage module. The steam-water mixing module comprises an ozone generator, a dosing tank and a steam-water mixing box; and the dosing tank is connected with the steam-water mixing box through the extraction pump. And the ultraviolet reaction module comprises a quartz sleeve, an ultraviolet lamp tube and a control panel. The water storage module comprises a water storage tank and an ozone tail gas destructor. According to the device disclosed by the utility model, impurity organic matters in the strong brine are removed by adopting an ozone-reinforced ultraviolet persulfate activation process. The reaction device is good in treatment effect, non-toxic, environment-friendly and high-oxidation-performance sulfate free radicals are combined, the influence of water quality on generation of the sulfate free radicals is small, other impurity elements cannot be introduced to influence subsequent salt purification, and the reaction device is of great significance to resource utilization of nanofiltration membrane strong brine in the coal chemical industry, the petrochemical industry, the coking industry and the like and has a wide application prospect. The method has the advantages of simple equipment, simplicity and convenience in operation, no pollution, high stability and higher economy.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a reaction device for removing total organic carbon from concentrated brine using a nanofiltration membrane. Background Art

[0002] Wastewater treatment in industries such as steel, coal chemical, and coking typically utilizes a combination of pretreatment, biochemical treatment, advanced treatment, dual-membrane technology, and evaporation and crystallization to achieve wastewater reuse and resource utilization. The dual-membrane method involves the combined use of nanofiltration and reverse osmosis membranes, with the nanofiltration membrane primarily used to separate divalent anion salts (primarily sodium sulfate) from monovalent anion salts (primarily sodium chloride) in the wastewater. The concentrated brine produced by the nanofiltration salt separation process has high sodium sulfate content, high COD, and poor biodegradability. Due to the high concentration of organic matter, direct entry of this high-salinity wastewater into the evaporation and crystallization unit without pretreatment can lead to severe foaming during the evaporation and crystallization process, impacting its operation. Furthermore, it can reduce the purity of the subsequent Na₂SO₄ crystallized salt, rendering it impure and unrecyclable. Therefore, reducing the organic matter concentration in the concentrated wastewater from the salt separation membrane is crucial for the continuity and safety of the evaporation and crystallization system and ensuring that the purity of the crystallized salt meets standards. Existing technologies for treating concentrated brine generated during nanofiltration membrane salt separation are ineffective, resulting in unstable treatment efficiency, making it difficult to ensure the normal operation of subsequent operations and achieving the goal of zero industrial wastewater discharge. Therefore, there is an urgent need to develop a reaction device for removing total organic carbon from concentrated brine using nanofiltration membranes to overcome these problems. Summary of the Invention

[0003] To address the above issues, the present utility model aims to provide a reaction device for removing total organic carbon from brine using nanofiltration membranes. This device, which utilizes a soda-water mixture to improve ozone mass transfer efficiency, enhances the ozone-enhanced UV-activated persulfate effect. The UV-activated persulfate generates sulfate and hydroxyl radicals, enhancing organic matter removal, improving the device's treatment efficiency, and increasing ozone utilization. This device offers advantages such as excellent treatment results, ease of adjustment, flexible operation, manageable operation, and stable water output, enabling the removal of total organic carbon from brine using nanofiltration membranes.

[0004] In order to achieve the above purpose, the specific technical solution adopted by the utility model is:

[0005] A reaction device for removing total organic carbon from concentrated brine using a nanofiltration membrane, characterized by comprising a water-gas mixing module, a UV reaction module, and a water storage module. The water-gas mixing module includes an ozone generator, a dosing tank, and a water-gas mixing tank; the dosing tank is connected to the water-gas mixing tank via an extraction pump. The UV reaction module includes a quartz sleeve, a UV lamp, and a control panel. The water storage module includes a water tank and an ozone exhaust destructor.

[0006] Furthermore, the ozone concentration generated by the ozone generator is 10-100 mg / L, and the ozone outlet gas is regulated by a rotor flow meter and enters the soda-water mixing tank.

[0007] Further, the concentrated brine is pumped into the soda mixing tank to mix with ozone. The water flow rate is 2-10 m 3 / h, regulated by electromagnetic flowmeter.

[0008] Furthermore, a probe for real-time detection of ozone concentration is installed in the soda-water mixing box, and the ozone dosage is 10-100 mg / (L∙min).

[0009] Furthermore, liquid level sensors are installed in the soda mixing tank and the water storage tank.

[0010] Furthermore, the dosing tank contains a concentrated persulfate solution. The persulfate solution is either sodium peroxymonosulfate or sodium peroxydisulfate, or a mixture thereof. The concentrated persulfate solution is fed into the soda-water mixing tank via a diaphragm metering pump. The molar ratio of the persulfate dosage to the total organic carbon (TOC) in the concentrated brine ranges from 1:1 to 20:1.

[0011] Furthermore, there are 4 UV lamps in the quartz sleeve, the UV radiation wavelength is less than 300nm, and the UV light intensity should be greater than 0.5μEinstein·s -1 The concentrated brine in the quartz sleeve is fully mixed with ozone and persulfate and reacts under ultraviolet light. The synergistic effect of ozone, persulfate and ultraviolet light is used to remove the total organic carbon in the concentrated brine through the salt separation membrane.

[0012] Furthermore, an ozone sensor is installed in the water tank.

[0013] Furthermore, an agitator is provided in the water tank, and the top is connected to the ozone exhaust gas destroyer through an exhaust gas collection pipe.

[0014] Compared with existing technologies, the present invention offers the following benefits: Soda-water mixing significantly improves ozone mass transfer efficiency and enhances the effect of ozone-enhanced UV-activated persulfate. Sulfate radicals and hydroxyl radicals, generated by persulfate activation in the UV reaction unit, non-selectively oxidize difficult-to-degrade organic matter, enhancing organic matter removal and significantly improving the treatment efficiency of the unit while also increasing ozone utilization. An exhaust gas destruction device is installed at the top of the water tank to prevent pollution caused by ozone escape. This equipment produces stable effluent, produces no sludge, and is easy to operate and maintain. It is suitable for treating concentrated brine with high organic carbon content and poor biodegradability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] In the figure: 1-air inlet pipe; 2-dosing tank; 3-diaphragm metering pump; 4-electromagnetic flowmeter; 5-lift pump; 6-double-head valve; 7-liquid level sensor; 8-agitator; 9-ozone exhaust destroyer; 10-ozone generator; 11-rotameter; 12-steam-water mixing tank; 13-ozone detection probe; 14-water inlet pipe; 15-control panel; 16-quartz sleeve; 17-UV lamp; 18-water storage tank; 19-ozone sensor; 20-water outlet pipe. DETAILED DESCRIPTION

[0017] The reaction device for removing total organic carbon from concentrated brine using a nanofiltration membrane disclosed in the present invention will be described clearly and completely below in conjunction with the specific embodiments shown in the accompanying drawings, but the content of the present invention is not limited to the following embodiments. In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0018] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0019] like Figure 1 As shown, this embodiment provides a reaction device for removing total organic carbon from brine using a nanofiltration membrane, comprising a water-gas mixing module, a UV reaction module, and a water storage module. The water-gas mixing module includes an ozone generator 10, a dosing tank 2, and a water-gas mixing tank 12; the dosing tank 2 is connected to the water-gas mixing tank 12 via a diaphragm metering pump 3. The UV reaction module includes a quartz sleeve 16, a UV lamp 17, and a control panel 15. The water storage module includes a water tank 18 and an ozone exhaust destructor 9.

[0020] The concentrated brine is lifted from the water inlet pipe 14 by the lifting pump to the water mixing tank 12 to mix with ozone. The water inlet flow rate is 2-10m 3 / h, regulated by electromagnetic flowmeter 4. The ozone generator produces ozone at a concentration of 10-100 mg / L. The ozone outlet is regulated by rotor flowmeter 14 and enters the soda-water mixing tank. The ozone dosage in the soda-water mixing tank is 10-100 mg / (L∙min). An ozone detection probe 13 is installed in the tank to monitor the ozone concentration in real time.

[0021] Dosing tank 2 contains a concentrated persulfate solution. The persulfate solution is either sodium permonosulfate or sodium perdisulfate, or a mixture of the two. The molar ratio of persulfate to total organic carbon in the brine ranges from 1:1 to 20:1. The concentrated persulfate solution enters the soda-water mixing tank 12 via a diaphragm metering pump 3. After remaining in the tank for one hour with the brine and ozone, it enters the UV reaction module via a lift pump.

[0022] The water from the water mixing module enters the quartz sleeve 16. There are four ultraviolet lamps 17 in the quartz sleeve. The ultraviolet radiation wavelength of the lamps is less than 300nm, and the ultraviolet light intensity should be greater than 0.5μEinstein·s -1 The number of active UV lamps is adjusted based on the water inflow, avoiding unnecessary energy consumption. The concentrated brine, ozone, and persulfate in the quartz sleeve 16 are thoroughly mixed and react under UV light of a specific wavelength and intensity. The synergistic effect of ozone, persulfate, and UV light removes the total organic carbon from the brine through the salt-splitting membrane. The control panel 15 displays the number of active lamps and their cumulative operating time.

[0023] The water from the UV reaction module enters the water storage tank 18. Liquid level sensors are installed in both the soda-water mixing tank 12 and the water storage tank 18. The water storage tank is equipped with an agitator 8 and an ozone sensor 19 mounted on top. Ozone exhaust flows through the exhaust collection pipe and enters the ozone exhaust destructor 9, ensuring the safety of the operating environment and personnel.

[0024] The reaction device has a good treatment effect. It combines sulfate free radicals that are non-toxic, environmentally friendly, and have strong oxidizing properties. The generation of sulfate free radicals is less affected by water quality and will not introduce other impurity elements to affect subsequent salt purification. It has the advantages of simple equipment and easy operation, and is pollution-free, highly stable, and more economical.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reaction device for removing total organic carbon from concentrated brine using a nanofiltration membrane, characterized in that: It includes a soda-water mixing module, an ultraviolet reaction module and a water storage module. The soda-water mixing module includes an ozone generator, a dosing tank and a soda-water mixing box; the dosing tank is connected to the soda-water mixing box through an extraction pump. The ultraviolet reaction module includes a quartz sleeve, an ultraviolet lamp and a control panel. The water storage module includes a water tank and an ozone exhaust destroyer.

2. The reaction device for removing total organic carbon from concentrated brine using a nanofiltration membrane as claimed in claim 1, characterized in that: The ozone concentration produced by the ozone generator is 10-100 mg / L, and the ozone outlet gas is regulated by a rotor flow meter and enters the soda-water mixing tank.

3. The reaction device for removing total organic carbon from concentrated brine using a nanofiltration membrane as claimed in claim 1, characterized in that: The concentrated brine is pumped into the soda mixing tank to mix with ozone, and the water flow rate is 2-10 m 3 / h, regulated by electromagnetic flowmeter.

4. The reaction device for removing total organic carbon from concentrated brine using a nanofiltration membrane as claimed in claim 1, characterized in that: A probe for real-time detection of ozone concentration is installed in the soda-water mixing box, and the ozone dosage is 10-100 mg / (L∙min).

5. The reaction device for removing total organic carbon from concentrated brine using a nanofiltration membrane as claimed in claim 1, characterized in that: Liquid level sensors are installed in the soda mixing tank and the water storage tank.

6. The reaction device for removing total organic carbon from concentrated brine using a nanofiltration membrane as claimed in claim 1, characterized in that: The dosing tank contains a persulfate concentrate, which is one of sodium peroxymonosulfate and sodium peroxydisulfate or a mixture of the two. The persulfate concentrate enters the soda-water mixing tank through a diaphragm metering pump. The molar concentration ratio of the persulfate dosage to the total organic carbon of the brine is 1:1 to 20:

1.

7. The reaction device for removing total organic carbon from concentrated brine using a nanofiltration membrane as claimed in claim 1, characterized in that: There are 4 UV lamps in the quartz tube. The UV radiation wavelength is less than 300nm and the UV intensity should be greater than 0.5μEinstein·s -1 The concentrated brine in the quartz sleeve is fully mixed with ozone and persulfate and reacts under ultraviolet light. The synergistic effect of ozone, persulfate and ultraviolet light is used to achieve the removal of total organic carbon in the concentrated brine by the salt separation membrane.

8. The reaction device for removing total organic carbon from concentrated brine using a nanofiltration membrane as claimed in claim 1, characterized in that: There is an ozone sensor in the water tank.

9. The reaction device for removing total organic carbon from concentrated brine using a nanofiltration membrane as claimed in claim 1, characterized in that: An agitator is provided in the water tank, and the top is connected to the ozone exhaust destroyer through an exhaust collection pipe.

Images