Device system and method for reusing reverse osmosis concentrated water

Abstract

The present invention provides a device system and method for recycling reverse osmosis brine. The device system comprises a reverse osmosis device, a brine storage device, and a brine recycling pipeline. The reverse osmosis device is provided with a brine outlet and a fresh water outlet, the brine outlet being connected to the brine storage device. The brine recycling pipeline is provided with a scale inhibitor addition assembly. The method comprises: transferring brine from the reverse osmosis device from the brine outlet to the brine storage device, adding a scale inhibitor to the brine recycling pipeline, and then transferring the brine from the brine recycling pipeline to a desired location. This method fully utilizes reverse osmosis brine without generating scale, is cost-effective, and has high economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a device system and method for reusing reverse osmosis concentrated water. Background Art

[0002] Wastewater treatment and recycling technology is of self-evident importance in improving the water safety and quality of life of urban and rural residents, saving precious water resources, reducing the total amount of pollution emissions and maintaining the healthy development of the economy and society.

[0003] The main methods for treating wastewater are categorized as physical, chemical, biological, and a combination of these. In the research and development of water treatment technologies, membrane technology has been hailed as the water treatment technology of the 21st century. Despite its relatively recent development, it has rapidly gained popularity and application in the water treatment field. Common membrane technologies include microfiltration, nanofiltration, ultrafiltration, and reverse osmosis. Reverse osmosis, used in the advanced treatment of domestic wastewater, can separate and remove organic matter and salt from the water, ensuring that the water quality meets water quality standards.

[0004] The production of reverse osmosis pure water produces a large amount of brine during the production process. The ratio of pure water to brine is generally 1:1. In practice, brine is often discharged directly into the sewage network, resulting in a significant waste of water resources. Therefore, it is necessary to develop a process for recycling and reusing brine wastewater from reverse osmosis membranes. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a device system and method for recycling reverse osmosis concentrated water. The device system can realize the recycling of concentrated water with low dosage of reagents, thereby saving water resources to the greatest extent.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a device system for recycling reverse osmosis concentrated water, the device system comprising a reverse osmosis device, a concentrated water storage device and a concentrated water recycling pipeline; the reverse osmosis device is provided with a concentrated water outlet and a fresh water outlet; the concentrated water outlet is connected to the concentrated water storage device; and the concentrated water recycling pipeline is provided with a scale inhibitor addition component.

[0008] The reverse osmosis concentrated water recycling device system provided by the present invention can prevent scaling during the concentrated water recycling process by arranging a scale inhibitor addition component on the pipeline, thereby avoiding the formation of dirt on the surface of related devices such as toilets during the recycling process.

[0009] Preferably, the antiscalant adding assembly includes a first antiscalant adding port and a second antiscalant adding port which are sequentially arranged near the concentrated water storage device.

[0010] Preferably, the setting interval between the first scale inhibitor addition port and the second scale inhibitor addition port is 1~3m, for example, it can be 1m, 1.3m, 1.5m, 1.7m, 1.9m, 2.2m, 2.4m, 2.6m, 2.8m or 3m, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0011] In the present invention, the positional relationship between the first scale inhibitor addition port and the second scale inhibitor addition port is critical. By setting the distance between the two to 1 to 3 meters, the components in the first scale inhibitor have sufficient reaction time to form soft scale. At the same time, they can cooperate with the second scale inhibitor in time to adsorb more metal ions in the water, thereby significantly improving the scale inhibition effect.

[0012] Preferably, the device system includes a raw water tank, a raw water conveying device, a physical filtration device, a softening device, a fine filtration device, a pressurizing device and a pure water storage device connected in sequence, the reverse osmosis device is arranged between the pressurizing device and the pure water storage device, and the fresh water outlet of the reverse osmosis device is connected to the pure water storage device.

[0013] Preferably, the device system further includes a pure water utilization device connected to the pure water storage device.

[0014] Preferably, the pure water utilization device includes a water dispenser.

[0015] Preferably, the physical filtration device comprises a sand filter and a carbon filter connected in sequence.

[0016] Preferably, the softening device is cyclically connected to the salt tank, and the softened water outlet of the salt tank is connected to the fine filtration device.

[0017] The second aspect provides a method for recycling reverse osmosis concentrated water, which is carried out using the reverse osmosis concentrated water recycling device system described in the first aspect.

[0018] Preferably, the method comprises: transporting the concentrated water of the reverse osmosis device from the concentrated water outlet to the concentrated water storage device, adding a scale inhibitor into the concentrated water recycling pipeline, and transporting the concentrated water from the concentrated water recycling pipeline to be recovered for use.

[0019] Preferably, the antiscalant includes a first antiscalant and a second antiscalant which are respectively fed into a first antiscalant addition port and a second antiscalant addition port.

[0020] Preferably, the first scale inhibitor comprises humic acid, an oxidant, diethyl diallyl sodium chloride, sodium allyl sulfonate, sodium sulfate, sodium carbonate and copper chloride.

[0021] The composition of the first scale inhibitor of the present invention adopts the above-mentioned components, wherein humic acid, diethyl diallyl sodium chloride and sodium allyl sulfonate react under the action of copper ions to graft to form a macromolecular substance containing zwitterions. The macromolecular substance has a chelating effect on metal ions in water and can also disperse calcium carbonate and calcium phosphate to form soft scale. This soft scale is soft and does not stick to the wall, so it will not form dirt on the surface of the device.

[0022] Preferably, the mass fraction of humic acid in the first scale inhibitor is 60~80wt%, for example, it can be 50wt%, 53wt%, 55wt%, 57wt%, 59wt%, 62wt%, 64wt%, 66wt%, 68wt% or 70wt%, etc., but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0023] Preferably, the mass fraction of the oxidant in the first scale inhibitor is 1~3wt%, for example, it can be 1wt%, 1.3wt%, 1.5wt%, 1.7wt%, 1.9wt%, 2.2wt%, 2.4wt%, 2.6wt%, 2.8wt% or 3wt%, etc., but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0024] Preferably, the oxidant is hydrogen peroxide.

[0025] Preferably, the total mass fraction of diethyl diallyl sodium chloride and sodium allyl sulfonate in the first scale inhibitor is 1 to 15 wt%, for example, it can be 1 wt%, 3 wt%, 5 wt%, 6 wt%, 8 wt%, 9 wt%, 11 wt%, 12 wt%, 14 wt% or 15 wt%, etc., but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0026] Preferably, the mass ratio of diethyl diallyl sodium chloride and sodium allyl sulfonate in the first scale inhibitor is 1 to 2:1, for example, it can be 1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1 or 2:1, but is not limited to the listed values, and other values ​​not listed within this range are also applicable.

[0027] Preferably, the mass fraction of sodium sulfate in the first scale inhibitor is 5~7wt%, for example, it can be 5wt%, 5.3wt%, 5.5wt%, 5.7wt%, 5.9wt%, 6.2wt%, 6.4wt%, 6.6wt%, 6.8wt% or 7wt%, etc., but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0028] Preferably, the mass fraction of sodium carbonate in the first scale inhibitor is 3 to 10 wt%, for example, it can be 3 wt%, 3.8 wt%, 4.6 wt%, 5.4 wt%, 6.2 wt%, 6.9 wt%, 7.7 wt%, 8.5 wt%, 9.3 wt% or 10 wt%, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0029] Preferably, the mass fraction of copper chloride in the first scale inhibitor is 0.5~3wt%, for example, it can be 0.5wt%, 0.8wt%, 1.1wt%, 1.4wt%, 1.7wt%, 1.9wt%, 2.2wt%, 2.5wt%, 2.8wt% or 3wt%, etc., but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0030] Preferably, the second antiscalant comprises polydimethylaminoethyl methacrylate.

[0031] The preferred second scale inhibitor of the present invention is polydimethylaminoethyl methacrylate, which has a hyperbranched structure and has good scale inhibition performance against sulfates, silicates, etc. on the basis of the first scale inhibitor. Moreover, it is added into the pipeline after the first scale inhibitor and can be added during the process of soft scale formed by the first scale inhibitor. The two work synergistically to form a micro-flocculated structure with a certain adsorption effect, thereby better avoiding the formation of scale.

[0032] Preferably, the mass ratio of the first scale inhibitor to the second scale inhibitor is 1.5-2:1, for example, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1 or 2.0:1, etc. Within this range, a better synergistic scale inhibition effect is achieved.

[0033] Preferably, the input amount of the first scale inhibitor accounts for a mass concentration of 0.01~0.5wt% in water, for example, it can be 0.01wt%, 0.07wt%, 0.12wt%, 0.18wt%, 0.23wt%, 0.29wt%, 0.34wt%, 0.4wt%, 0.45wt% or 0.5wt%, etc., but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0034] The pharmaceutical preparation of the present invention has low input amount and low cost.

[0035] Preferably, the method includes: raw water is transported from a raw water tank to a physical filtration device through a raw water transport device for physical filtration, softened through a softening device, finely filtered through a fine filtration device, pressurized through a pressurizing device, and then transported to a reverse osmosis device for reverse osmosis treatment, and the pure water treated with reverse osmosis is transported to a pure water storage device for standby use.

[0036] Preferably, the TDS of the reverse osmosis concentrated water is in the range of 5000~30000 mg / L, for example, it can be 5000 mg / L, 6000 mg / L, 7000 mg / L, 8000 mg / L, 9000 mg / L, 10000 mg / L, 12000 mg / L, 15000 mg / L, 20000 mg / L, 25000 mg / L or 30000 mg / L, but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0037] Compared with the prior art, the present invention has at least the following beneficial effects:

[0038] (1) The device system provided by the present invention can realize the reuse of concentrated water resources, thus saving water resources;

[0039] (2) The method for recycling reverse osmosis concentrated water provided by the present invention significantly improves the scale inhibition effect in the process of recycling concentrated water resources by adding two scale inhibitors for synergistic interaction. The amount of agent added is low, and the input amount of the first scale inhibitor accounts for 0.01~0.5wt% of the mass concentration in water. No scale is generated on the surface of the device after long-term operation for more than 50 days. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a system diagram of the device for recycling reverse osmosis concentrated water provided in Example 1 of the present invention.

[0041] In the figure: 1-raw water tank; 2-raw water conveying device; 31-sand filter; 32-carbon filter; 4-softening device; 5-salt box; 6-fine filtration device; 7-pressurization device; 8-reverse osmosis device; 9-pure water storage device; 10-pure water utilization device; 11-water dispenser; 12-concentrated water storage device. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0043] The present invention is further described in detail below. However, the following examples are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0044] It should be understood that, in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships 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 limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] It should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] Those skilled in the art should understand that the present invention must include necessary pipelines, conventional valves and general pump equipment for realizing a complete process, but the above content does not belong to the main invention point of the present invention. Those skilled in the art can add layouts on their own based on the process flow and equipment structure selection, and the present invention does not make special requirements and specific limitations on this.

[0047] Example 1

[0048] This embodiment provides a device system for recycling reverse osmosis concentrated water, such as Figure 1 As shown, the device system includes a reverse osmosis device 8, a concentrated water storage device 12 and a concentrated water recycling pipeline; the reverse osmosis device 8 is provided with a concentrated water outlet and a fresh water outlet; the concentrated water outlet is connected to the concentrated water storage device 12; and the concentrated water recycling pipeline is provided with a scale inhibitor addition component.

[0049] The antiscalant adding assembly includes a first antiscalant adding port and a second antiscalant adding port which are sequentially arranged near the concentrated water storage device 12 , and the interval between the first antiscalant adding port and the second antiscalant adding port is 1 m.

[0050] The device system also includes a raw water tank 1, a raw water conveying device 2, a physical filtration device, a softening device 4, a fine filtration device 6, a pressurizing device 7 and a pure water storage device 9 connected in sequence. The reverse osmosis device 8 is arranged between the pressurizing device 7 and the pure water storage device 9, and the fresh water outlet of the reverse osmosis device 8 is connected to the pure water storage device 9.

[0051] The device system further includes a pure water utilization device 10 connected to the pure water storage device 9 ; the pure water utilization device 10 may be, for example, a water dispenser 11 .

[0052] The physical filtration device includes a sand filter 31 and a carbon filter 32 connected in sequence; the softening device 4 is cyclically connected to the salt box 5, and the softened water outlet of the salt box 5 is connected to the fine filtration device 6.

[0053] Example 2

[0054] This embodiment provides a device system for recycling reverse osmosis concentrated water, which includes a reverse osmosis device, a concentrated water storage device and a concentrated water recycling pipeline; the reverse osmosis device is provided with a concentrated water outlet and a fresh water outlet; the concentrated water outlet is connected to the concentrated water storage device; and the concentrated water recycling pipeline is provided with a scale inhibitor addition component.

[0055] The antiscalant adding assembly includes a first antiscalant adding port and a second antiscalant adding port which are sequentially arranged near the concentrated water storage device, and the interval between the first antiscalant adding port and the second antiscalant adding port is 3m.

[0056] The device system also includes a raw water tank, a raw water conveying device, a physical filtration device, a softening device, a fine filtration device, a pressurizing device and a pure water storage device connected in sequence. The reverse osmosis device is arranged between the pressurizing device and the pure water storage device, and the fresh water outlet of the reverse osmosis device is connected to the pure water storage device.

[0057] The device system also includes a pure water utilization device connected to the pure water storage device; the pure water utilization device includes a water dispenser.

[0058] The physical filtration device includes a sand filter and a carbon filter connected in sequence; the softening device is cyclically connected to the salt box, and the softened water outlet of the salt box is connected to the fine filtration device.

[0059] Example 3

[0060] This embodiment provides a device system for recycling reverse osmosis concentrated water, which includes a reverse osmosis device, a concentrated water storage device and a concentrated water recycling pipeline; the reverse osmosis device is provided with a concentrated water outlet and a fresh water outlet; the concentrated water outlet is connected to the concentrated water storage device; and the concentrated water recycling pipeline is provided with a scale inhibitor addition component.

[0061] The antiscalant adding assembly includes a first antiscalant adding port and a second antiscalant adding port which are sequentially arranged near the concentrated water storage device, and the arrangement interval between the first antiscalant adding port and the second antiscalant adding port is 2m.

[0062] The device system also includes a raw water tank, a raw water conveying device, a physical filtration device, a softening device, a fine filtration device, a pressurizing device and a pure water storage device connected in sequence. The reverse osmosis device is arranged between the pressurizing device and the pure water storage device, and the fresh water outlet of the reverse osmosis device is connected to the pure water storage device.

[0063] The device system also includes a pure water utilization device connected to the pure water storage device; the pure water utilization device includes a water dispenser.

[0064] The physical filtration device includes a sand filter and a carbon filter connected in sequence; the softening device is cyclically connected to the salt box, and the softened water outlet of the salt box is connected to the fine filtration device.

[0065] Example 4

[0066] This embodiment provides a device system for recycling reverse osmosis concentrated water. The device system is the same as that of Embodiment 1 except that the interval between the first antiscalant addition port and the second antiscalant addition port is 0.5 m.

[0067] Example 5

[0068] This embodiment provides a device system for recycling reverse osmosis concentrated water. The device system is the same as that of embodiment 1 except that the interval between the first antiscalant addition port and the second antiscalant addition port is 5 m.

[0069] Example 6

[0070] This embodiment provides a device system for recycling reverse osmosis concentrated water. The device system is the same as that of embodiment 1 except that only a first scale inhibitor addition port is provided.

[0071] Comparative Example 1

[0072] This comparative example provides a device system for recycling reverse osmosis concentrated water. The device system is the same as Example 1 except that a first antiscalant addition port and a second antiscalant addition port are provided.

[0073] Application Example 1

[0074] This application example provides a method for recycling reverse osmosis concentrated water, which is carried out using the reverse osmosis concentrated water recycling device system described in Example 1.

[0075] The method comprises: raw water is sequentially conveyed from a raw water tank through a raw water conveying device to a physical filtration device for physical filtration, softened through a softening device, finely filtered through a fine filtration device, pressurized through a pressurizing device, and then conveyed to a reverse osmosis device for reverse osmosis treatment; the pure water treated with reverse osmosis is conveyed to a pure water storage device for standby use; concentrated water from the reverse osmosis device is conveyed from a concentrated water outlet to a concentrated water storage device, a scale inhibitor is added to the concentrated water recycling pipeline, and the concentrated water is conveyed from the concentrated water recycling pipeline for recovery and standby use.

[0076] The antiscalant includes a first antiscalant and a second antiscalant respectively introduced into a first antiscalant addition port and a second antiscalant addition port.

[0077] The first scale inhibitor includes 64 wt % humic acid, 1 wt % hydrogen peroxide, 7.5 wt % diethyl diallyl sodium chloride, 7.5 wt % sodium allyl sulfonate, 7 wt % sodium sulfate, 10 wt % sodium carbonate and 3 wt % copper chloride, and the addition amount is 0.05 wt %.

[0078] The second scale inhibitor includes polydimethylaminoethyl methacrylate (molecular weight 1600), and the addition amount is 0.03wt%.

[0079] Application Example 2

[0080] This application example provides a method for recycling reverse osmosis concentrated water, which is carried out using the reverse osmosis concentrated water recycling device system described in Example 2.

[0081] The method comprises: raw water is sequentially conveyed from a raw water tank through a raw water conveying device to a physical filtration device for physical filtration, softened through a softening device, finely filtered through a fine filtration device, pressurized through a pressurizing device, and then conveyed to a reverse osmosis device for reverse osmosis treatment; the pure water treated with reverse osmosis is conveyed to a pure water storage device for standby use; concentrated water from the reverse osmosis device is conveyed from a concentrated water outlet to a concentrated water storage device, a scale inhibitor is added to the concentrated water recycling pipeline, and the concentrated water is conveyed from the concentrated water recycling pipeline for recovery and standby use.

[0082] The antiscalant includes a first antiscalant and a second antiscalant respectively introduced into a first antiscalant addition port and a second antiscalant addition port.

[0083] The first scale inhibitor includes 75 wt % humic acid, 2 wt % hydrogen peroxide, 8 wt % diethyl diallyl sodium chloride, 4 wt % sodium allyl sulfonate, 5.5 wt % sodium sulfate, 5 wt % sodium carbonate and 0.5 wt % copper chloride, and the addition amount is 0.2 wt %.

[0084] The second scale inhibitor includes polydimethylaminoethyl methacrylate (molecular weight 1600), and the addition amount is 0.1wt%.

[0085] Application Example 3

[0086] This application example provides a method for recycling reverse osmosis concentrated water, which is carried out using the reverse osmosis concentrated water recycling device system described in Example 3.

[0087] The method comprises: raw water is sequentially conveyed from a raw water tank through a raw water conveying device to a physical filtration device for physical filtration, softened through a softening device, finely filtered through a fine filtration device, pressurized through a pressurizing device, and then conveyed to a reverse osmosis device for reverse osmosis treatment; the pure water treated with reverse osmosis is conveyed to a pure water storage device for standby use; concentrated water from the reverse osmosis device is conveyed from a concentrated water outlet to a concentrated water storage device, a scale inhibitor is added to the concentrated water recycling pipeline, and the concentrated water is conveyed from the concentrated water recycling pipeline for recovery and standby use.

[0088] The antiscalant includes a first antiscalant and a second antiscalant respectively introduced into a first antiscalant addition port and a second antiscalant addition port.

[0089] The first scale inhibitor includes 80 wt % humic acid, 1 wt % hydrogen peroxide, 2 wt % diethyl diallyl sodium chloride, 1 wt % sodium allyl sulfonate, 6 wt % sodium sulfate, 8 wt % sodium carbonate and 2 wt % copper chloride, and the addition amount is 0.03 wt %.

[0090] The second scale inhibitor includes polydimethylaminoethyl methacrylate (molecular weight 1600), and the addition amount is 0.02 wt%.

[0091] Application Example 4

[0092] This application example provides a method for recycling reverse osmosis concentrated water. The method is the same as that of Application Example 1 except that the reverse osmosis concentrated water recycling device system described in Example 4 is used.

[0093] Application Example 5

[0094] This application example provides a method for recycling reverse osmosis concentrated water. The method is the same as that of Application Example 1 except that the reverse osmosis concentrated water recycling device system described in Example 5 is used.

[0095] Application Example 6

[0096] This application example provides a method for reusing reverse osmosis concentrated water. The method is the same as that of Application Example 1 except that citric acid is used as the second scale inhibitor.

[0097] Application Example 7

[0098] This application example provides a method for recycling reverse osmosis concentrated water. The method is the same as that of Application Example 1 except that the first scale inhibitor does not contain sodium allyl sulfonate.

[0099] Application Example 8

[0100] This application example provides a method for recycling reverse osmosis concentrated water. The method is the same as that of Application Example 1 except that the first scale inhibitor does not contain diethyl diallyl sodium chloride.

[0101] Application Example 9

[0102] This application example provides a method for recycling reverse osmosis concentrated water. The method is the same as Application Example 2 except that the first scale inhibitor contains 4 wt% diethyl diallyl sodium chloride and 8 wt% sodium allyl sulfonate.

[0103] Application Example 10

[0104] This application example provides a method for recycling reverse osmosis concentrated water. The method is the same as Application Example 1 except that the amount of the first scale inhibitor added is 0.03wt% and the amount of the second scale inhibitor added is 0.05wt%.

[0105] Application Example 11

[0106] This application example provides a method for recycling reverse osmosis concentrated water. The method is the same as application example 1 except that the reverse osmosis concentrated water recycling device system described in Example 6 is used and the first scale inhibitor and the second scale inhibitor are added to the first scale inhibitor addition port at the same time.

[0107] Comparative Application Example 1

[0108] This application comparative example provides a method for recycling reverse osmosis concentrated water. The method is the same as Application Example 1 except that the reverse osmosis concentrated water recycling device system described in Comparative Example 1 is used and the first and second scale inhibitors are not added.

[0109] Test Method: Using the aforementioned application example and comparative example, we conducted a brine reuse test. The TDS of the brine effluent from the reverse osmosis unit was 12,000 mg / L. The unit operated continuously for 50 days, and the time at which surface scaling occurred was observed. The test results are shown in Table 1.

[0110] Table 1

[0111]

[0112] From Table 1 we can see the following points:

[0113] (1) Comprehensive application examples 1 to 3 show that the reverse osmosis concentrated water recycling device system provided by the present invention can better treat reverse osmosis concentrated water and will not produce scale after it is reused as reclaimed water. It can operate continuously for 50 days without producing scale.

[0114] (2) Comprehensively analyzing Application Example 1 and Comparative Example 1, it can be seen that Application Example 1, in which the first scale inhibitor and the second scale inhibitor were added, can operate for 50 days without generating scale, while Comparative Example 1 generates scale on the first day. This shows that the present invention significantly reduces the scaling during the reuse of reverse osmosis concentrated water by selecting the addition of the first scale inhibitor and the second scale inhibitor;

[0115] (3) Comprehensively analyzing Application Example 1, Application Examples 4-5 and Application Example 11, it can be seen that the present invention adds the first scale inhibitor and the second scale inhibitor separately and limits the distance between them. Compared with the combined addition in Application Example 11, the distance between them in Application Examples 4-5 is too close or too far, and the scaling time of Application Examples 4-5 and Application Example 11 is significantly shortened. This shows that the present invention adds the two scale inhibitors at a certain distance, allowing the internal reaction of the first scale inhibitor to proceed for a part before adding the second scale inhibitor, which is beneficial to the formation of branched humic acid of the first scale inhibitor and interacts with the hyperbranched structure of the second scale inhibitor to form softened micro-flocculation with a certain adsorption effect, thereby avoiding the formation of scaling;

[0116] (4) It can be seen from the comprehensive application example 1 and application examples 6 to 9 that when the components of the first scale inhibitor and the second scale inhibitor are adjusted, the scale inhibition effect is significantly reduced. This shows that the present invention significantly improves the scale inhibition effect through the synergistic effect of the first scale inhibitor and the second scale inhibitor, and can also achieve excellent scale inhibition effect for reverse osmosis concentrated water with high TDS content.

[0117] The applicant declares that the above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention fall within the scope of protection and disclosure of the present invention.

Claims

1. A method for recycling reverse osmosis concentrated water, characterized in that: The method is carried out using a reverse osmosis concentrated water recycling device system; The device system includes a reverse osmosis device, a concentrated water storage device and a concentrated water recycling pipeline; The reverse osmosis device is provided with a concentrated water outlet and a fresh water outlet; The concentrated water outlet is connected to the concentrated water storage device; The concentrated water recycling pipeline is provided with a scale inhibitor adding component; The antiscalant adding assembly comprises a first antiscalant adding port and a second antiscalant adding port which are sequentially arranged near the concentrated water storage device; The interval between the first antiscalant addition port and the second antiscalant addition port is 1 to 3 meters; The scale inhibitor includes a first scale inhibitor and a second scale inhibitor respectively input into a first scale inhibitor addition port and a second scale inhibitor addition port; The first scale inhibitor comprises humic acid, an oxidant, diethyl diallyl sodium chloride, sodium allyl sulfonate, sodium sulfate, sodium carbonate and copper chloride; The mass fraction of humic acid in the first scale inhibitor is 60-80wt%; The mass fraction of the oxidant in the first scale inhibitor is 1-3wt%; The oxidant is hydrogen peroxide; The total mass fraction of diethyl diallyl sodium chloride and sodium allyl sulfonate in the first scale inhibitor is 1-15wt%; The mass ratio of diethyl diallyl sodium chloride to sodium allyl sulfonate in the first scale inhibitor is 1-2:1; The mass fraction of sodium sulfate in the first scale inhibitor is 5-7wt%; The mass fraction of sodium carbonate in the first scale inhibitor is 3-10wt%; The mass fraction of copper chloride in the first scale inhibitor is 0.5-3wt%; The second antiscalant includes polydimethylaminoethyl methacrylate.

2. The method according to claim 1, characterized in that The device system includes a raw water tank, a raw water conveying device, a physical filtration device, a softening device, a fine filtration device, a pressurizing device and a pure water storage device connected in sequence. The reverse osmosis device is arranged between the pressurizing device and the pure water storage device, and the fresh water outlet of the reverse osmosis device is connected to the pure water storage device.

3. The method according to claim 2, characterized in that The device system also includes a pure water utilization device connected to the pure water storage device.

4. The method according to claim 3, characterized in that The pure water utilization device includes a water dispenser.

5. The method according to claim 2, characterized in that The physical filtering device includes a sand filter and a carbon filter connected in sequence.

6. The method according to claim 2, characterized in that The softening device is circulated with the salt box, and the softened water outlet of the salt box is connected to the fine filtration device.

7. The method according to any one of claims 1 to 6, characterized in that The method comprises: transporting concentrated water from a reverse osmosis device to a concentrated water storage device from a concentrated water outlet, adding a scale inhibitor into the concentrated water recycling pipeline, and transporting the concentrated water from the concentrated water recycling pipeline to a recovery location for use.

8. The method according to any one of claims 1 to 6, characterized in that The method comprises: raw water is sequentially transported from a raw water tank through a raw water transport device to a physical filtration device for physical filtration, softened through a softening device, finely filtered through a fine filtration device, pressurized through a pressurizing device, and then transported to a reverse osmosis device for reverse osmosis treatment; the pure water treated with reverse osmosis is transported to a pure water storage device for standby use.

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