High-recovery-rate pure water treatment device

Abstract

The utility model provides a high-recovery-rate pure water treatment device, which belongs to the technical field of water treatment and comprises a raw water tank, a raw water pump, a filter system, a pure water tank, a primary reverse osmosis device, a secondary reverse osmosis device, an EDI (Electronic Data Interchange) device, a polishing mixed bed device and a concentrated water recovery system, wherein the raw water tank, the raw water pump, the filtering system, the water purifying tank, the primary reverse osmosis device, the secondary reverse osmosis device, the EDI device and the polishing mixed bed device are sequentially communicated along the purified water discharging direction; a concentrated water discharge end of the secondary reverse osmosis device is communicated with the purified water tank; the water inlet end of the concentrated water recovery system is communicated with the concentrated water discharge end of the primary reverse osmosis device, and the water outlet end of the concentrated water recovery system is communicated with the water purification tank. According to the high-recovery-rate pure water treatment device, purified water and concentrated water discharged by the primary reverse osmosis device are further concentrated and recycled, so that the utilization rate of input tap water is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a high recovery rate pure water treatment device. Background Art

[0002] The problem that cannot be avoided in the ultrapure water system of the reverse osmosis membrane process is the comprehensive utilization rate of tap water. The process involves the discharge of filtered backwash water, reverse osmosis concentrated water, EDI concentrated water and the discharge of ultrapure water with unqualified purity. The conventional backwash water and reverse osmosis concentrated water of the filtration treatment are discharged into the municipal sewage pipe, resulting in the concentrated water discharged from many places not being effectively utilized, reducing the total utilization rate of tap water, making the utilization rate of tap water for existing pure water treatment only about 70%-75%. For large-flow reverse osmosis devices, a large amount of water resources are wasted and the cost of ultrapure water production is increased.

[0003] Therefore, it is necessary to design a high-recovery pure water treatment device to solve the above problems. Utility Model Content

[0004] In view of the above shortcomings of the prior art, the utility model provides a high recovery rate pure water treatment device to solve the technical problems that the ultrapure water system of the existing sampling reverse osmosis membrane process has low utilization rate of tap water, which easily causes waste of water resources and increase of water production cost.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a high-recovery pure water treatment device, which includes: a raw water tank, a raw water pump, a filtration system, a clean water tank, a primary reverse osmosis device, a secondary reverse osmosis device, an EDI device, a polishing mixed bed device and a concentrated water recovery system;

[0006] Among them, the raw water tank, raw water pump, filtration system, clean water tank, primary reverse osmosis device, secondary reverse osmosis device, EDI device and polishing mixed bed device are connected in sequence along the purified water discharge direction; the concentrate water discharge end of the secondary reverse osmosis device is connected to the clean water tank; the water inlet end of the concentrate water recovery system is connected to the concentrate water discharge end of the primary reverse osmosis device, and the water outlet end of the concentrate water recovery system is connected to the clean water tank.

[0007] In an example of the present utility model, the concentrated water recovery system includes a first concentrated water reverse osmosis recovery device and a second concentrated water reverse osmosis recovery device; the water inlet end of the first concentrated water reverse osmosis recovery device is connected to the concentrated water discharge end of the first-level reverse osmosis device, and the water outlet end of the first concentrated water reverse osmosis recovery device is connected to the clean water tank; the water inlet end of the second concentrated water reverse osmosis recovery device is connected to the concentrated water discharge end of the first concentrated water reverse osmosis recovery device, and the water outlet end of the second concentrated water reverse osmosis recovery device is connected to the clean water tank.

[0008] In an example of the present invention, the EDI device has a concentrated water discharge end, and the concentrated water discharge end of the EDI device is connected to the clean water tank.

[0009] In an example of the present utility model, a first stop valve is provided between the clean water tank and the primary reverse osmosis device.

[0010] In one example of the utility model, the filtration system includes a mechanical filter and an activated carbon filter, the water inlet end of the mechanical filter is connected to the water outlet end of the raw water pump, the water inlet end of the activated carbon filter is connected to the water outlet end of the mechanical filter, and the water outlet end of the activated carbon filter is connected to the clean water tank; both the mechanical filter and the activated carbon filter have a concentrated water discharge end.

[0011] In one example of the utility model, the high-recovery pure water treatment device also includes a concentrate tank, the water inlet end of the concentrate tank is connected to the concentrate discharge end of the primary reverse osmosis device, the water outlet end of the concentrate tank is connected to the raw water tank, and a first reflux pump is provided at the water outlet end of the concentrate tank.

[0012] In an example of the utility model, the high-recovery pure water treatment device also includes a concentrate tank, the water inlet end of the concentrate tank is connected to the concentrate discharge end of the primary reverse osmosis device, the water outlet end of the concentrate tank is connected to the water inlet ends of the mechanical filter and the activated carbon filter through pipelines, and a first reflux pump is provided at the water outlet end of the concentrate tank.

[0013] In an example of the present invention, a second stop valve is provided at the water outlet of the concentrated water tank.

[0014] In an example of the utility model, the high-recovery pure water treatment device also includes a backwash water recovery system, which includes a backwash water recovery tank and a plate and frame filter press, the water inlet end of the backwash water recovery tank is connected to the concentrated water discharge end of the mechanical filter and the activated carbon filter; the top of the backwash water recovery tank is connected to a first reflux pipe, a second reflux pump is arranged on the first reflux pipe, and the first reflux pipe is connected to the raw water tank; the bottom of the backwash water recovery tank is connected to the plate and frame filter press through a pipeline, and the water outlet end of the plate and frame filter press is connected to the raw water tank through a second reflux pipe.

[0015] In one example of the utility model, the filtration system also includes a softening filter and a precision filter. The mechanical filter, activated carbon filter, softening filter and precision filter are connected in sequence along the water outlet direction, and the water outlet end of the precision filter is connected to the clean water tank.

[0016] The utility model provides a high-recovery pure water treatment device, which is provided with a secondary reverse osmosis device at the water outlet end of the primary reverse osmosis device for discharging pure water, and further purifies the pure water discharged from the primary reverse osmosis device by using the secondary reverse osmosis device, and circulates the concentrated water back to the clean water tank for reuse; at the same time, a concentrated water recovery system is provided at the concentrated water discharge end of the primary reverse osmosis device, and the concentrated water recovery system is used to perform secondary concentration on the concentrated water discharged from the primary reverse osmosis device, and the filtered clean water is circulated back to the clean water tank for reuse, and the above measures effectively improve the utilization rate of tap water by the high-recovery pure water treatment device, and reduce the increase in water production costs caused by the waste of water resources. The high-recovery pure water treatment device reuses the clean water and concentrated water discharged from the primary reverse osmosis device to further improve the utilization rate of input tap water. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic structural diagram of a high recovery rate pure water treatment device in one embodiment of the utility model;

[0019] Figure 2 It is a structural schematic diagram of a high recovery rate pure water treatment device in another embodiment of the utility model.

[0020] Component number description

[0021] 100, raw water tank; 110, raw water pump; 200, filtration system; 210, mechanical filter; 220, activated carbon filter; 230, softening filter; 240, precision filter; 300, clean water tank; 310, first stop valve; 400, primary reverse osmosis device; 410, concentrate tank; 411, second stop valve; 412, first reflux pump; 500, secondary reverse osmosis device; 600, EDI device; 700, polishing mixed bed device; 800, concentrate recovery system; 810, first concentrate reverse osmosis recovery device; 820, second concentrate reverse osmosis recovery device; 900, backwash water recovery system; 910, backwash water recovery tank; 911, first reflux pipe; 912, second reflux pump; 920, plate and frame filter press; 921, second reflux pipe. DETAILED DESCRIPTION

[0022] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific implementation schemes, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0023] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present utility model without substantially changing the technical content.

[0024] The utility model provides a high-recovery pure water treatment device, which further concentrates and reuses the clean water and concentrated water discharged from a primary reverse osmosis device to improve the utilization rate of input tap water in the high-recovery pure water treatment device, thereby solving the technical problem that the ultrapure water system of the existing sampling reverse osmosis membrane process has a low utilization rate of tap water, which easily causes waste of water resources and increased water production costs.

[0025] See also Figure 1 and Figure 2The high recovery rate pure water treatment device comprises a raw water tank 100, a raw water pump 110, a filtration system 200, a clean water tank 300, a primary reverse osmosis device 400, a secondary reverse osmosis device 500, an EDI device 600 (Electrodeionization), a polishing mixed bed device 700 and a concentrated water recovery system 800. The raw water tank 100, the raw water pump 110, the filtration system 200, the clean water tank 300, the primary reverse osmosis device 400, the secondary reverse osmosis device 500, the EDI device 600 and the polishing mixed bed device 700 are sequentially connected along the purified water discharge direction. Among them, after the tap water enters the raw water tank 100, it is transported to the filtration system 200 through the raw water pump 110. The water filtered by the filtration system 200 enters the clean water tank 300. The filtered water accumulated in the clean water tank 300 is discharged to the primary reverse osmosis device 400 and the secondary reverse osmosis device 500 for reverse osmosis treatment. After reverse osmosis treatment, the water discharged from the secondary reverse osmosis device 500 is discharged to the EDI device 600 and the polishing mixed bed device 700 for further purification treatment. Finally, the prepared ultrapure water is output from the water outlet of the polishing mixed bed device 700.

[0026] See also Figure 1 and Figure 2 The primary reverse osmosis device 400, the secondary reverse osmosis device 500 and the EDI device 600 have a concentrated water discharge end in addition to a water inlet end and a water outlet end. The concentrated water discharge end of the primary reverse osmosis device 400 is connected to the water inlet end of the concentrated water recovery system 800, and the concentrated water recovery system 800 is connected to the clean water tank 300. The concentrated water recovery system 800 further concentrates the concentrated water discharged from the primary reverse osmosis device 400 and returns the treated clean water to the clean water tank 300 for reuse. The water inlet end of the secondary reverse osmosis device 500 is connected to the water outlet end of the primary reverse osmosis device 400, and the concentrate discharge end of the secondary reverse osmosis device 500 is connected to the clean water tank 300. In addition to further reverse osmosis treatment of the purified water output by the primary reverse osmosis device 400, the secondary reverse osmosis device 500 also returns the concentrate filtered by reverse osmosis to the clean water tank 300 for reuse; the water inlet end of the EDI device 600 is connected to the water outlet end of the secondary reverse osmosis device 500, and the concentrate discharge end of the EDI device 600 is connected to the clean water tank 300. Like the secondary reverse osmosis device 500, the EDI device 600 not only performs ion filtration on the purified water output by the secondary reverse osmosis device 500, but also returns the concentrate filtered by ion to the clean water tank 300 for reuse. Under the above circulation structure, the high recovery rate pure water treatment device recycles the purified water and concentrated water output by the primary reverse osmosis device 400 at the same time, so as to improve the utilization rate of purified tap water and reduce the waste of water resources.

[0027] Also, see Figure 1 and Figure 2In some embodiments, a first stop valve 310 is provided between the clean water tank 300 and the primary reverse osmosis device 400. The first stop valve 310 is closed before the water level in the clean water tank 300 reaches a preset circulation water level, and is opened after the water level in the clean water tank 300 reaches the preset circulation water level, so that the clean water stored in the clean water tank 300 can be transported to the primary reverse osmosis device 400 for subsequent purification treatment.

[0028] See also Figure 1 and Figure 2 In some embodiments, the concentrated water recovery system 800 includes a first concentrated water reverse osmosis recovery device 810 and a second concentrated water reverse osmosis recovery device 820. The water inlet of the first concentrated water reverse osmosis recovery device 810 is connected to the concentrated water discharge end of the primary reverse osmosis device 400, and the water outlet of the first concentrated water reverse osmosis recovery device 810 is connected to the clean water tank 300. The first concentrated water reverse osmosis recovery device 810 further concentrates and filters the concentrated water discharged from the primary reverse osmosis device 400, and returns the filtered purified water from the water outlet to the clean water tank 300 for reuse. The water inlet end of the second concentrated water reverse osmosis recovery device 820 is connected to the concentrated water discharge end of the first concentrated water reverse osmosis recovery device 810, and the water outlet end of the second concentrated water reverse osmosis recovery device 820 is connected to the clean water tank 300. The second concentrated water reverse osmosis recovery device 820 further concentrates and filters the concentrated water discharged from the first concentrated water reverse osmosis recovery device 810, and returns the filtered purified water from the water outlet end to the clean water tank 300 for reuse. The concentrated water filtered by the second concentrated water reverse osmosis recovery device 820 is directly discharged from the concentrated water discharge end and no longer enters the pure water circulation.

[0029] See also Figure 1 and Figure 2In some embodiments, the filtration system 200 includes at least a mechanical filter 210, an activated carbon filter 220, a softening filter 230 and a precision filter 240. The water inlet end of the mechanical filter 210 is connected to the water outlet end of the raw water pump 110. The mechanical filter 210, the activated carbon filter 220, the softening filter 230 and the precision filter 240 are connected in sequence along the water outlet direction. The water inlet end of the activated carbon filter 220 is connected to the water outlet end of the mechanical filter 210, the water inlet end of the softening filter 230 is connected to the water outlet end of the activated carbon filter 220, the water inlet end of the precision filter 240 is connected to the water outlet end of the precision filter 240, and the water outlet end of the precision filter 240 is connected to the clean water tank 300. The mechanical filter 210, the activated carbon filter 220, the softening filter 230 and the precision filter 240 all have a concentrated water discharge end. Among them, in the filtration system 200, a mechanical filter 210 is set to filter and intercept suspended matter, sediment, etc. in the incoming water. When a certain pressure difference is reached, backwashing is required to regenerate the filter material layer and remove the intercepted suspended matter; an activated carbon filter 220 is set to intercept, adsorb and filter organic matter in the incoming water, adsorb effective chlorine for oxidative sterilization, avoid oxidative damage to the rear-stage reverse osmosis membrane, and at the same time adsorb and decolorize the incoming water to ensure the clarity of the outlet water; a softening filter 230 can remove calcium and magnesium ions in the incoming water to avoid deposition of calcium carbonate or calcium sulfate, magnesium carbonate or magnesium sulfate on the rear-stage reverse osmosis membrane surface; a precision filter 240 is set as a protective device before the reverse osmosis membrane, intercepting possible particulate matter in the filtration pretreatment device to avoid scratching or clogging the membrane.

[0030] See also Figure 1 and Figure 2 In some embodiments, a high-recovery pure water treatment device performs a diversion treatment on the concentrated water discharged from the first-stage reverse osmosis device 400. Part of the concentrated water discharged from the first-stage reverse osmosis device 400 enters the concentrated water recovery system 800 for concentration and filtration, and then flows back to the clean water tank 300 for reuse, and participates in subsequent reverse osmosis and deionization treatment; another part of the concentrated water discharged from the first-stage reverse osmosis device 400 flows back to the filtration system 200 for reuse, and is purified again from the beginning.

[0031] For example Figure 1 As shown, in one embodiment, the high-recovery pure water treatment device also includes a concentrate tank 410, the concentrate discharge end of the first-stage reverse osmosis device 400 is connected to the water inlet end of the concentrate tank 410, the concentrate tank 410 stores reverse osmosis concentrate discharged from the first-stage reverse osmosis device 400, the water outlet end of the concentrate tank 410 is connected to the raw water tank 100, and a first reflux pump 412 is provided on the pipeline between the concentrate tank 410 and the raw water tank 100, the first reflux pump 412 drives the concentrate stored in the concentrate tank 410 to flow back to the raw water tank 100 for further recycling.

[0032] For example Figure 2 As shown, in another embodiment, the high-recovery pure water treatment device also includes a concentrate tank 410, the concentrate discharge end of the first-stage reverse osmosis device 400 is connected to the water inlet end of the concentrate tank 410, the concentrate tank 410 stores reverse osmosis concentrate discharged from the first-stage reverse osmosis device 400, the water outlet end of the concentrate tank 410 is respectively connected to the water inlet ends of the mechanical filter 210 and the activated carbon filter 220 through pipelines, and a first reflux pump 412 is provided on the pipeline between the concentrate tank 410 and the raw water tank 100, the first reflux pump 412 drives the concentrate stored in the concentrate tank 410 to flow back to the mechanical filter 210 and the activated carbon filter 220 through the pipeline for further recycling.

[0033] Also, see Figure 1 and Figure 2 In some embodiments, a second stop valve 411 is provided at the water outlet of the concentrate tank 410. The second stop valve 411 is closed before the water level of the concentrate tank 410 reaches a preset circulation water level, and is opened after the water level of the concentrate tank 410 reaches the preset circulation water level, so that the concentrate stored in the concentrate tank 410 can circulate back.

[0034] See also Figure 1 and Figure 2 In some embodiments, the high-recovery pure water treatment device also includes a backwash water recovery system 900, the water inlet end of the backwash water recovery system 900 is connected to the concentrated water discharge end of the filtration system 200, and the clean water outlet end of the backwash water recovery system 900 is connected to the raw water tank 100. The backwash water recovery system 900 is used to recover the backwash water filtered by the filtration system 200, and after the backwash water is precipitated, the usable clean water is returned to the raw water tank 100 for recycling. The backwash water recovery system 900 includes a backwash water recovery tank 910 and a plate-frame filter press 920. The water inlet of the backwash water recovery tank 910 is connected to the concentrated water discharge end of the mechanical filter 210 and the activated carbon filter 220. The backwash water recovery tank 910 is provided with a dosing port. The backwash water stored in the backwash water recovery tank 910 is stratified into an upper supernatant and a bottom sediment after dosing and precipitation. The top of the backwash water recovery tank 910 is connected to a first reflux pipe 911, which is connected to the raw water tank 100. The first reflux pipe 911 is connected, and a second reflux pump 912 is arranged on the first reflux pipe, and the second reflux pump 912 drives the supernatant on the top layer of the backwash water recovery tank 910 to flow back into the raw water tank 100; the bottom of the backwash water recovery tank 910 is connected with the plate and frame filter press 920 through a pipeline, and the water outlet end of the plate and frame filter press 920 is connected with the raw water tank 100 through the second reflux pipe 921, and the concentrated water near the bottom of the backwash water recovery tank 910 is further filtered by the plate and frame filter press 920 and then flows back to the raw water tank 100 through the second reflux pipe 921.

[0035] In summary, the utility model provides a high-recovery pure water treatment device that further concentrates and reuses the clean water and concentrated water discharged from the primary reverse osmosis device to improve the utilization rate of tap water by the high-recovery pure water treatment device, thereby reducing the increase in water production costs caused by the waste of water resources. The high-recovery pure water treatment device reuses the clean water and concentrated water discharged from the primary reverse osmosis device to further improve the utilization rate of input tap water.

[0036] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A high recovery rate pure water treatment device, characterized in that: include: Raw water tank, raw water pump, filtration system, clean water tank, primary reverse osmosis device, secondary reverse osmosis device, EDI device, polishing mixed bed device and concentrated water recovery system; The raw water tank, raw water pump, filtration system, clean water tank, primary reverse osmosis device, secondary reverse osmosis device, EDI device and polishing mixed bed device are connected in sequence along the purified water discharge direction; the concentrated water discharge end of the secondary reverse osmosis device is connected to the clean water tank; The water inlet of the concentrated water recovery system is connected to the concentrated water discharge end of the primary reverse osmosis device, and the water outlet of the concentrated water recovery system is connected to the clean water tank; Among them, the concentrated water recovery system includes a first concentrated water reverse osmosis recovery device and a second concentrated water reverse osmosis recovery device; the water inlet end of the first concentrated water reverse osmosis recovery device is connected to the concentrated water discharge end of the first-level reverse osmosis device, and the water outlet end of the first concentrated water reverse osmosis recovery device is connected to the clean water tank; the water inlet end of the second concentrated water reverse osmosis recovery device is connected to the concentrated water discharge end of the first concentrated water reverse osmosis recovery device, and the water outlet end of the second concentrated water reverse osmosis recovery device is connected to the clean water tank.

2. The high recovery rate pure water treatment device according to claim 1, characterized in that: The EDI device has a concentrated water discharge end, and the concentrated water discharge end of the EDI device is connected to the clean water tank.

3. The high recovery rate pure water treatment device according to claim 1, characterized in that: A first stop valve is arranged between the clean water tank and the primary reverse osmosis device.

4. The high recovery rate pure water treatment device according to claim 1, characterized in that: The filtration system includes a mechanical filter and an activated carbon filter, the water inlet end of the mechanical filter is connected to the water outlet end of the raw water pump, the water inlet end of the activated carbon filter is connected to the water outlet end of the mechanical filter, and the water outlet end of the activated carbon filter is connected to the clean water tank; both the mechanical filter and the activated carbon filter have concentrated water discharge ends.

5. The high recovery rate pure water treatment device according to claim 1, characterized in that: The high-recovery pure water treatment device also includes a concentrate tank, the water inlet end of the concentrate tank is connected to the concentrate discharge end of the primary reverse osmosis device, the water outlet end of the concentrate tank is connected to the raw water tank, and a first reflux pump is provided at the water outlet end of the concentrate tank.

6. The high recovery rate pure water treatment device according to claim 4, characterized in that: The high-recovery pure water treatment device also includes a concentrate tank, the water inlet end of the concentrate tank is connected to the concentrate discharge end of the primary reverse osmosis device, the water outlet end of the concentrate tank is connected to the water inlet ends of the mechanical filter and the activated carbon filter through pipelines, and a first reflux pump is provided at the water outlet end of the concentrate tank.

7. The high recovery rate pure water treatment device according to claim 5 or 6, characterized in that: A second stop valve is provided at the water outlet of the concentrated water tank.

8. The high recovery rate pure water treatment device according to claim 4, characterized in that: The high-recovery pure water treatment device also includes a backwash water recovery system, which includes a backwash water recovery tank and a plate and frame filter press. The water inlet end of the backwash water recovery tank is connected to the concentrated water discharge end of the mechanical filter and the activated carbon filter; the top of the backwash water recovery tank is connected to a first reflux pipe, a second reflux pump is arranged on the first reflux pipe, and the first reflux pipe is connected to the raw water tank; the bottom of the backwash water recovery tank is connected to the plate and frame filter press through a pipeline, and the water outlet end of the plate and frame filter press is connected to the raw water tank through a second reflux pipe.

9. The high recovery rate pure water treatment device according to claim 4, characterized in that: The filtration system also includes a softening filter and a precision filter. The mechanical filter, activated carbon filter, softening filter and precision filter are connected in sequence along the water outlet direction, and the water outlet end of the precision filter is connected to the clean water tank.

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