Reverse osmosis concentrated water treatment system

Abstract

The utility model provides a reverse osmosis concentrated water treatment system. The reverse osmosis concentrated water treatment system comprises a hardness and fluorine removal integrated device, a micro-nano ozone oxidation device and an activated carbon adsorption device, the input end of the hardness and fluorine removal integrated device is communicated with the concentrated water output end of the reverse osmosis membrane, the output end of the hardness and fluorine removal integrated device is communicated with the input end of the micro-nano ozone oxidation device, and the hardness and fluorine removal integrated device is used for carrying out hardness and fluorine removal treatment on reverse osmosis concentrated water through conventional flocculent precipitation and conveying the reverse osmosis concentrated water to the micro-nano ozone oxidation device; the output end of the micro-nano ozone oxidation device is communicated with the input end of the activated carbon adsorption device, and the micro-nano ozone oxidation device is used for carrying out COD (Chemical Oxygen Demand) removal operation on the reverse osmosis concentrated water subjected to hardness removal and fluorine removal and conveying the reverse osmosis concentrated water to the activated carbon adsorption device; the output end of the activated carbon adsorption device is communicated with the drain tank and is used for adsorbing the reverse osmosis concentrated water through activated carbon and conveying the reverse osmosis concentrated water to the drain tank. According to the reverse osmosis concentrated water treatment system provided by the invention, efficient and stable fluorine removal can be realized, and the use amount of ozone is reduced while the COD removal effect is ensured.

Description

Technical Field

[0001] The present application relates to the field of sewage treatment, and in particular to a reverse osmosis concentrated water treatment system. Background Art

[0002] When water treatment is carried out in the sewage treatment plant of the chemical park, a large amount of reverse osmosis membrane or nanofiltration membrane concentrate will be produced. The main characteristics of membrane concentrate are high salt content and basically no biodegradability, so the membrane concentrate is mostly treated to meet the standards before being discharged.

[0003] At present, membrane concentrate is usually treated by ozone catalytic oxidation or electrocatalytic oxidation. Ozone catalytic oxidation has the problems of high investment and operating costs and the need for regular replacement of catalysts; while electrocatalytic oxidation has the problems of severe electrode corrosion, high power consumption, and large footprint. Summary of the invention

[0004] In response to the above problems, the present application provides a reverse osmosis concentrated water treatment system and system, which can achieve efficient and stable fluorine removal and reduce ozone usage while ensuring COD removal effect.

[0005] To achieve the purpose of this application, this application provides the following technical solutions:

[0006] The present application provides a reverse osmosis concentrated water treatment system, including: a hardness and fluorine removal integrated device, a micro-nano ozone oxidation device, and an activated carbon adsorption device;

[0007] The input end of the integrated hardness and fluorine removal device is connected to the concentrated water output end of the reverse osmosis membrane, and the output end is connected to the input end of the micro-nano ozone oxidation device, for removing hardness and fluorine from the reverse osmosis concentrated water by conventional flocculation and sedimentation, and transporting it to the micro-nano ozone oxidation device;

[0008] The output end of the micro-nano ozone oxidation device is connected to the input end of the activated carbon adsorption device, and is used to remove COD from the reverse osmosis concentrated water after hardness and fluorine removal, and transport it to the activated carbon adsorption device;

[0009] The output end of the activated carbon adsorption device is communicated with the drainage pool, and is used for adsorbing the reverse osmosis concentrated water through the activated carbon and transporting it to the drainage pool.

[0010] In a possible implementation, the output end of the integrated hardness and fluorine removal device is connected to the input end of the micro-nano ozone oxidation device through a secondary defluorination device, and the secondary defluorination device is used to perform secondary defluorination treatment on the concentrated water output by the integrated hardness and fluorine removal device using a high-efficiency defluorination agent.

[0011] In a possible implementation, the integrated hardness and fluorine removal device can reduce the fluoride ion content in the reverse osmosis membrane concentrated water to below 2.0 mg / L by means of a flocculant.

[0012] In a possible implementation, the secondary defluorination device can reduce the fluoride ion content in the reverse osmosis membrane concentrated water output by the integrated hardness and fluoride removal device to below 1.5 mg / L by using a high-efficiency defluorination agent.

[0013] In a possible implementation, the micro-nano ozone oxidation device can reduce the COD content in the reverse osmosis concentrated water output by the secondary defluorination device to below 70 mg / L by micro-nano ozone oxidation.

[0014] In a possible implementation, the activated carbon adsorption device can reduce the COD content in the reverse osmosis concentrated water output by the micro-nano ozone oxidation device to below 50 mg / L through activated carbon adsorption.

[0015] In a possible implementation, the flocculant includes any one or more of a rare earth composite flocculant, anionic polyacrylamide, an aluminum salt flocculant, and an iron salt flocculant.

[0016] In a possible implementation, the high-efficiency defluoridation agent is a high-efficiency defluoridation agent suitable for treating water bodies with a fluoride ion content of less than 20 mg / L.

[0017] The beneficial effects of this application are as follows:

[0018] The technical solution of the present application can remove most of the fluoride ions through conventional coagulation and sedimentation, reducing the fluoride ion content to below 2.0 mg / L, and then reduce the fluoride ion content from 2.0 mg / L to below 1.5 mg / L through a high-efficiency defluorination agent, thereby saving agents while ensuring high efficiency and stability of defluorination; and, by using micro-nano ozone oxidation, the amount of ozone used can be reduced while ensuring the COD removal effect, saving at least 30% of the ozone usage under the same conditions, and at the same time coupling activated carbon adsorption to ensure that the COD content is reduced to below 50 mg / L, thereby meeting the emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0020] Figure 1 This is a schematic diagram of the structure of the reverse osmosis concentrated water treatment system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0023] Example 1

[0024] Figure 1 A reverse osmosis concentrated water treatment system provided in the embodiment of the present application includes: an integrated hardness and fluorine removal device, a micro-nano ozone oxidation device, and an activated carbon adsorption device;

[0025] The input end of the integrated hardness and fluorine removal device is connected to the concentrated water output end of the reverse osmosis membrane, and the output end is connected to the input end of the micro-nano ozone oxidation device, for removing hardness and fluorine from the reverse osmosis concentrated water by conventional flocculation and sedimentation, and transporting it to the micro-nano ozone oxidation device;

[0026] The output end of the micro-nano ozone oxidation device is connected to the input end of the activated carbon adsorption device, and is used to remove COD from the reverse osmosis concentrated water after hardness and fluorine removal, and transport it to the activated carbon adsorption device;

[0027] The output end of the activated carbon adsorption device is communicated with the drainage pool, and is used for adsorbing the reverse osmosis concentrated water through the activated carbon and transporting it to the drainage pool.

[0028] The concentrated water from the reverse osmosis membrane may also be concentrated water from a nanofiltration membrane.

[0029] In a possible implementation, the output end of the integrated hardness and fluorine removal device is connected to the input end of the micro-nano ozone oxidation device through a secondary defluorination device, and the secondary defluorination device is used to perform secondary defluorination treatment on the concentrated water output by the integrated hardness and fluorine removal device using a high-efficiency defluorination agent.

[0030] Optionally, the output end of the integrated hardness and fluorine removal device is connected to the input end of the secondary defluorination device through a first pipe, and the output end of the secondary defluorination device is connected to the input end of the micro-nano ozone oxidation device through a second pipe, and there are filters in the first pipe and the second pipe.

[0031] In a possible implementation, the integrated hardness and fluorine removal device can reduce the fluoride ion content in the reverse osmosis membrane concentrated water to below 2.0 mg / L by means of a flocculant.

[0032] Optionally, the integrated hardness and fluorine removal device can be any wastewater fluorine and hardness removal device in the prior art.

[0033] In a possible implementation, the secondary defluorination device can reduce the fluoride ion content in the reverse osmosis membrane concentrated water output by the integrated hardness and fluoride removal device to below 1.5 mg / L by using a high-efficiency defluorination agent.

[0034] Optionally, the secondary defluorination device may be any defluorination device for sewage treatment in the prior art or a defluorination reaction tank with stirring, sedimentation and transportation functions.

[0035] In a possible implementation, the micro-nano ozone oxidation device can reduce the COD content in the reverse osmosis concentrated water output by the secondary defluorination device to below 70 mg / L by micro-nano ozone oxidation.

[0036] Optionally, the micro-nano ozone oxidation device may be any micro-nano ozone oxidation device for sewage treatment in the prior art.

[0037] In a possible implementation, the activated carbon adsorption device can reduce the COD content in the reverse osmosis concentrated water output by the micro-nano ozone oxidation device to below 50 mg / L through activated carbon adsorption.

[0038] Optionally, the activated carbon adsorption device may be any activated carbon adsorption device for sewage treatment in the prior art.

[0039] In a possible implementation, the flocculant includes any one or more of a rare earth composite flocculant, anionic polyacrylamide, an aluminum salt flocculant, and an iron salt flocculant.

[0040] In a possible implementation, the high-efficiency defluoridation agent is a high-efficiency defluoridation agent suitable for treating water bodies with a fluoride ion content of less than 20 mg / L.

[0041] Working principle:

[0042] This patent is mainly aimed at the excessive COD and fluoride content in the membrane (reverse osmosis membrane or nanofiltration membrane) concentrate, which makes the membrane concentrate unable to be discharged directly. Because this project is mainly applicable to the membrane concentrate in the water reuse of industrial parks, the raw water treated by the membrane is the qualified discharge water after treatment by the industrial park sewage treatment plant. The indicators of qualified discharge water meet the 2002 Class A standard in the "Pollutant Discharge Standard for Urban Wastewater Treatment Plants" GB 18918, so the discharge indicators of the water after membrane concentration should also meet the 2002 Class A standard in GB18918 before it can be directly discharged.

[0043] The 2002 Level A standard in GB 18918 does not have any requirements for fluoride ions. In recent years, the photovoltaic industry has developed rapidly, generating a large amount of fluoride-containing wastewater, and the country's control over fluoride ions has become increasingly strict. The purpose of fluoride removal in this project is to initiate a demonstration effect, comply with national environmental protection trend requirements, control the fluoride content in membrane concentrated water to below 1.5 mg / L, use integrated fluoride and hardness removal equipment to remove most of the fluoride through coagulation and sedimentation, and then use high-efficiency defluorination agents to reduce the fluoride from about 2 to below 1.5.

[0044] The 2002 Level A standard in GB 18918 stipulates that COD should be less than 50 mg / L. The water source for recycled water reuse is the qualified discharge water from the industrial park sewage treatment plant, that is, the COD design value of the water source for recycled water reuse is 50 mg / L. The COD of the concentrate after membrane concentration is about 200. The response to the excessive COD content in membrane concentrate is to adopt micro-nano ozone oxidation activated carbon adsorption coupling process. Micro-nano ozone oxidation can reduce the COD in membrane concentrate to about 70 mg / L, and then the COD is reduced to below 50 mg / L after activated carbon adsorption.

[0045] In the several embodiments provided in the present application, it should be understood that the disclosed systems, modules and methods can be implemented in other ways. For example, the module embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, modules or units, which can be electrical, mechanical or other forms.

[0046] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A reverse osmosis concentrated water treatment system, characterized in that: include: Integrated hardness and fluorine removal device, micro-nano ozone oxidation device, activated carbon adsorption device; The input end of the integrated hardness and fluorine removal device is connected to the concentrated water output end of the reverse osmosis membrane, and the output end is connected to the input end of the micro-nano ozone oxidation device; The output end of the micro-nano ozone oxidation device is connected to the input end of the activated carbon adsorption device; The output end of the activated carbon adsorption device is communicated with the drainage tank.

2. The reverse osmosis concentrated water treatment system according to claim 1, characterized in that: The output end of the integrated hardness removal and fluorine removal device is connected to the input end of the micro-nano ozone oxidation device through a secondary fluorine removal device.

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