A water purification treatment system and method

Abstract

The present invention discloses a water purification treatment system and method. The system includes a manganese sand filtration unit, an effluent regulation unit, and an advanced oxidation unit; the effluent regulation unit is provided with an effluent regulation unit water inlet, a first water outlet, and a second water outlet; the advanced oxidation unit includes an ultraviolet reaction device; the ultraviolet reaction device is provided with a hydrogen peroxide input port; the water outlet on the manganese sand filtration unit is connected to the effluent regulation unit water inlet; the first water outlet is connected to the water inlet on the ultraviolet reaction device; the second water outlet is used for discharging the final effluent; the water outlet on the advanced oxidation unit is connected to the water inlet on the manganese sand filtration unit. The system of the present application can avoid the influence of iron and manganese in groundwater on the scaling of the outer surface of the ultraviolet lamp tube, and at the same time can quench the remaining hydrogen peroxide.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification treatment, and particularly relates to a water purification treatment system and method. Background Art

[0002] The phenomenon of soil pollution is relatively common, resulting in the risk that groundwater sources are polluted by various trace organic pollutants; currently, water purification plants and treatment equipment use traditional treatment processes or ozone-activated carbon processes to treat trace refractory organic substances such as PPCPs (the full name is "Pharmaceutical and Personal Care Products"), but the removal effect is extremely limited.

[0003] Advanced oxidation technology, also known as advanced oxidation processes, is characterized by the generation of hydroxyl radicals (·OH) with strong oxidation ability. According to the different ways of generating free radicals and reaction conditions, it can be divided into photocatalytic oxidation, catalytic wet air oxidation, sonochemical oxidation, ozone oxidation, electrochemical oxidation, Fenton oxidation, etc. Among them, the ultraviolet / hydrogen peroxide (UV / H2O2) oxidation method, which is one of the photocatalytic oxidation methods, has application advantages in terms of safety and operating costs, and has successful engineering practices.

[0004] However, when applying the ultraviolet / hydrogen peroxide (UV / H2O2) oxidation method to the water treatment process of water sources containing iron and manganese, the following problems exist: 1) Iron and manganese elements will accelerate the scaling on the surface of ultraviolet lamps, greatly reducing the water treatment efficiency; 2) According to the principle of advanced oxidation, the excessive H2O2 added needs to be quenched, for example, by passing through an activated carbon column; no matter what quenching method is used, additional process flows need to be added, increasing the investment and operating costs. Especially for small-scale treatment or in-situ groundwater treatment devices, it is very inconvenient, restricting its large-scale application.

[0005] Therefore, a treatment system is needed that can improve the advanced oxidation treatment efficiency of ultraviolet / hydrogen peroxide and reduce the operating cost while ensuring the water quality of the effluent. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the defects that when the existing water treatment system uses the ultraviolet / hydrogen peroxide (UV / H2O2) oxidation method to treat water, iron and manganese will accelerate the scaling on the surface of ultraviolet lamps, reduce the water treatment efficiency, and the excessive H2O2 added needs additional process flows for quenching, resulting in high costs and complex processes, so as to provide a water purification treatment system and method.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] A water purification treatment system, which includes a manganese sand filtration unit, an effluent adjustment unit, and an advanced oxidation unit;

[0009] The water outlet regulating unit is provided with a water inlet of the water outlet regulating unit, a first water outlet and a second water outlet;

[0010] The advanced oxidation unit includes an ultraviolet reaction device; a hydrogen peroxide inlet is provided on the ultraviolet reaction device;

[0011] The water outlet on the manganese sand filtering unit is connected to the water inlet of the water outlet regulating unit;

[0012] The first water outlet is connected to the water inlet on the ultraviolet reaction device;

[0013] The second water outlet is used for discharging the final effluent;

[0014] The water outlet on the advanced oxidation unit is connected to the water inlet on the manganese sand filtering unit.

[0015] In the present invention, preferably, the water purification treatment system further includes a backwashing unit for backwashing the manganese sand filtering unit.

[0016] Wherein, preferably, the backwashing unit includes a backwashing water pump and an air pressurizing device; the outlet of the backwashing water pump is connected to the manganese sand filtering unit through a backwashing water pipeline, and the air pressurizing device is connected to the manganese sand filtering unit through a backwashing air pipeline.

[0017] The inlet of the backwashing water pump is preferably connected to a third water outlet provided on the water outlet regulating unit.

[0018] The air pressurizing device can be conventional in the art, for example, it can be a backwashing air compressor and / or a backwashing blower.

[0019] In the present invention, preferably, the manganese sand filtering unit includes a filtering layer, and the filtering layer is sequentially provided with a quartz sand layer and a manganese sand layer from top to bottom.

[0020] Wherein, the manganese sand filtering unit may further include a filtering tank, the filtering tank is provided with a plurality of filtering grids, and the filtering layer is provided in the filtering grids.

[0021] In the present invention, preferably, the manganese sand filtering unit is further sequentially connected with a water collecting tank and a drainage tank for collecting and discharging wastewater.

[0022] In the present invention, the water inlet on the manganese sand filtering unit is generally connected with a water inlet pipeline or a water inlet channel.

[0023] In the present invention, preferably, the first water outlet is connected to the water inlet on the ultraviolet reaction device through a variable frequency water pump.

[0024] In the present invention, the second water outlet is generally connected to a water outlet pipe.

[0025] In the present invention, the advanced oxidation unit may further include a hydrogen peroxide storage device, and the hydrogen peroxide storage device is used to add hydrogen peroxide to the ultraviolet reaction device.

[0026] Preferably, the water inlet on the manganese sand filtration unit is connected to the water inlet on the ultraviolet reaction device through a first pipe, and the outlet of the hydrogen peroxide storage device communicates with the first pipe.

[0027] Preferably, the outlet of the hydrogen peroxide storage device is connected to the hydrogen peroxide input port through a second pipe.

[0028] In the present invention, preferably, the water purification treatment system is preferably arranged in upper and lower layers. The manganese sand filtration unit is arranged in the upper space, the water outlet adjustment unit is arranged in the lower space, and the advanced oxidation unit is arranged on one side of the water outlet adjustment unit.

[0029] More preferably, when the advanced oxidation unit includes a hydrogen peroxide storage device, the ultraviolet reaction device in the advanced oxidation unit is arranged on one side of the water outlet adjustment unit; the hydrogen peroxide storage device is arranged in the upper space vertically corresponding to the ultraviolet reaction device.

[0030] Preferably, when the water purification treatment system includes a backwashing unit and the backwashing unit includes a backwashing water pump and an air pressurizing device, the backwashing water pump is arranged in the lower space and on the other side of the water outlet adjustment unit; the air pressurizing device is arranged in the upper space vertically corresponding to the backwashing water pump.

[0031] Preferably, when the manganese sand filtration unit is sequentially connected with a water collecting tank and a drainage tank, the water collecting tank and the drainage tank are vertically arranged below the manganese sand filtration unit and are located in the upper space.

[0032] The present invention also provides a water purification treatment method, which includes the following steps: introducing the water source to be treated into the water inlet of the manganese sand filtration unit, passing through the water outlet adjustment unit and entering the ultraviolet reaction device, and adding hydrogen peroxide to the ultraviolet reaction device for oxidation treatment; then outputting the water treated by the oxidation treatment from the water outlet of the ultraviolet reaction device and introducing it into the manganese sand filtration unit, and finally discharging the treated water from the second water outlet.

[0033] The positive and progressive effects of the present invention are as follows:

[0034] 1) Combining the manganese sand filtration unit with the advanced oxidation unit avoids the influence of iron and manganese in groundwater on the fouling of the outer surface of the ultraviolet lamp tube.

[0035] 2) The water purification system of the present application can quench the residual hydrogen peroxide after advanced oxidation economically and efficiently without adding additional process flows (such as activated carbon, etc.). At the same time, the oxygen generated during the quenching process can increase the dissolved oxygen of the raw water, promote the contact oxidation reaction of iron and manganese in the raw water, realize the utilization of residues while improving the efficiency, and form a synergistic effect;

[0036] 3) In a preferred embodiment of the present application, by arranging the upper and lower layers of the water purification system, the coordination problems of the backwashing unit, advanced oxidation unit, etc. are solved, which is beneficial to the compact layout of the combined process and saves land;

[0037] 4) In a preferred embodiment of the present application, by setting a variable-frequency pump, the head loss of the ultraviolet reaction device is overcome; at the same time, according to the change of the raw water quality, the amount of water to be advanced oxidized can be adjusted, reducing the operating cost. Brief Description of the Drawings

[0038] Figure 1 It is a schematic flow chart of the water purification method in Embodiment 2 of the present invention.

[0039] Figure 2 It is a top view of the layout of the upper space of the water purification system in Embodiment 1 of the present invention.

[0040] Figure 3 It is a top view of the layout of the lower space of the water purification system in Embodiment 1 of the present invention.

[0041] Figure 4 is Figure 2 The sectional view (left view) along line A-A in

[0042] Figure 5 is Figure 2 The sectional view (front view) along line B-B in

[0043] Among them, 1 is the manganese sand filtration unit, 101 is the quartz sand layer, 102 is the manganese sand layer, 103 is the filter grid, 2 is the water outlet adjustment unit, 3 is the advanced oxidation unit, 4 is the backwashing unit, 401 is the backwashing water pump, 402 is the backwashing blower, 403 is the backwashing air compressor, 5 is the inlet pipeline, 6 is the collecting tank, 7 is the drainage tank, 8 is the variable-frequency water pump, 9 is the ultraviolet reaction device, 901 is the hydrogen peroxide inlet, 10 is the hydrogen peroxide storage device, and 11 is the outlet pipeline. Detailed Embodiments

[0044] The present invention will be further described below by way of examples, but the present invention is not limited to the scope of the described examples. The experimental methods without specific conditions in the following examples are carried out according to conventional methods and conditions, or selected according to the product specifications.

[0045] Example 1 Water Purification Treatment System

[0046] As Figure 2 and Figure 3 shown in the water purification treatment system, which includes a manganese sand filtration unit 1, an effluent regulation unit 2, an advanced oxidation unit 3 and a backwashing unit 4; the effluent regulation unit 2 is provided with an effluent regulation unit inlet, a first outlet and a second outlet; the advanced oxidation unit 3 includes an ultraviolet reaction device 9 and a hydrogen peroxide storage device 10; the ultraviolet reaction device 9 is provided with a hydrogen peroxide input port 901; the outlet on the manganese sand filtration unit 1 is connected to the inlet of the effluent regulation unit; the first outlet is connected to the inlet on the ultraviolet reaction device 9; the second outlet is used to discharge the final effluent; the outlet on the advanced oxidation unit 3 is connected to the inlet on the manganese sand filtration unit 1.

[0047] In this embodiment, the water purification treatment system is arranged in upper and lower layers ( Figure 2 is the upper space of the water purification system, Figure 3 is the lower space of the water purification system), the manganese sand filtration unit 1 is arranged in the upper space, the effluent regulation unit 2 is arranged in the lower space, and the ultraviolet reaction device 9 is arranged on one side of the effluent regulation unit 2; the hydrogen peroxide storage device 10 is arranged in the upper space vertically corresponding to the ultraviolet reaction device 9. The water filtered by the manganese sand filtration unit 1 enters the effluent regulation unit 2 in the lower layer through the pipeline system.

[0048] In this embodiment, as Figure 4 shown, the backwashing unit 4 includes a backwashing water pump 401 and an air pressurizing device. The backwashing unit 4 is used to backwash the manganese sand filtration unit 1. The outlet of the backwashing water pump 401 is connected to the manganese sand filtration unit 1 through a backwashing water pipeline, and the inlet of the backwashing water pump is connected to the third outlet provided on the effluent regulation unit; the air pressurizing device is connected to the manganese sand filtration unit 1 through a backwashing air pipeline and is used for air flushing of the filter tank system. The backwashing water pump 401 is arranged in the lower space and on the other side of the effluent regulation unit 2; the air pressurizing device includes a backwashing blower 402 and a backwashing air compressor 403, and the backwashing blower 402 and the backwashing air compressor 403 are arranged in the upper space vertically corresponding to the backwashing water pump 401.

[0049] In this embodiment, as Figure 5 shown, the manganese sand filtration unit 1 is sequentially connected with a collecting trough 6 and a drainage trough 7. The collecting trough 6 and the drainage trough 7 are vertically arranged below the manganese sand filtration unit 1 and are located in the upper space; the collecting trough 6 and the drainage trough 7 are used for collecting and discharging waste water. During backwashing, the filter grid 103 stops water inlet, collects water from the collecting trough 6 and the drainage trough 7 and enters the drainage system.

[0050] In this embodiment, the manganese sand filtration unit 1 includes a filtration layer and a filtration tank. The filtration layer is sequentially provided with a quartz sand layer 101 and a manganese sand layer 102 from top to bottom; the filtration tank is provided with a plurality of filtration cells 103, and the filtration layer is provided in the filtration cells 103. The filtration layer is respectively used for intercepting suspended solids, removing iron and manganese, and removing excessive hydrogen peroxide.

[0051] In this embodiment, a water inlet on the manganese sand filtration unit 1 is connected to a water inlet pipe 5; the first water outlet is connected to the water inlet of the ultraviolet reaction device 9 through a variable frequency water pump 8; the second water outlet is connected to a water outlet pipe 11.

[0052] In this embodiment, the water inlet on the manganese sand filtration unit 1 is connected to the water inlet of the ultraviolet reaction device 9 through a pipe, and the outlet of the hydrogen peroxide storage device 10 is communicated with the pipe, and hydrogen peroxide is added through the hydrogen peroxide inlet 901.

[0053] The water purification system of this embodiment eliminates the influence of iron and manganese in groundwater on the ultraviolet reactor. At the same time, the manganese dioxide component in the manganese sand filtration unit can quench the residual hydrogen peroxide economically and efficiently without adding additional process flows (such as activated carbon, etc.). At the same time, the oxygen generated during the quenching process can increase the dissolved oxygen in the raw water, promote the contact oxidation reaction of iron and manganese in the raw water, improve the efficiency while realizing the utilization of residues, and form a synergistic effect; by arranging the water outlet adjustment unit, backwashing unit and advanced oxidation unit up and down, it is beneficial to the compact layout of the combined process and saves land; through the setting of the variable frequency water pump, the head loss generated by the ultraviolet reaction device is overcome, and the process problem is solved.

[0054] Water purification treatment method of Embodiment 2

[0055] As Figure 1 shown, the water purification treatment system in Embodiment 1 is used for water purification treatment, which includes the following steps: the water source to be treated is introduced into the water inlet of the manganese sand filtration unit 1, enters the ultraviolet reaction device 9 through the first water outlet of the water outlet adjustment unit 2, and hydrogen peroxide is added through the hydrogen peroxide inlet 901 of the ultraviolet reaction device 9 for oxidation treatment; then the water treated by oxidation is output from the water outlet of the ultraviolet reaction device 9 and introduced into the manganese sand filtration unit 1 again, the filtered water enters the water outlet adjustment unit 2 from the water outlet of the manganese sand filtration unit 1, and the final water outlet is discharged from the second water outlet. Table 2 shows the results of hydrogen peroxide quenching (No. 1-7 in Table 2 are various activated carbons, and the activated carbons are filled in a columnar reactor, and the parameters of the columnar reactor are shown in Table 1), and the effect of manganese sand is equivalent to or better than that of activated carbon.

[0056] In this embodiment, during the water purification treatment process, the backwashing unit 4 will regularly backwash the manganese sand filtration unit 1. Among them, the backwashing water pump performs backwashing on the manganese sand filtration unit 1, and the backwashing blower 402 and the backwashing air compressor 403 are used for air flushing of the filtration tank system.

[0057] Table 1 Parameters of the Column Reactor

[0058] Empty bed contact time 4.17 min Empty bed flow velocity 0.1 cm / s Carbon bed height 25 cm Inner diameter 3.2 cm Outer diameter 4 cm Upper and lower glass beads filling 7.5 cm * 2 Total length 40 cm Flow rate 48.26 ml / min

[0059] Table 2 Results of Hydrogen Peroxide Quenching Test

[0060]

[0061] In Table 2, "-" indicates below the detection limit.

Claims

1. A water purification treatment method, characterized in that, It adopts a water purification treatment system, and the water purification treatment system includes a manganese sand filtration unit, an effluent regulation unit, and an advanced oxidation unit; an inlet for the effluent regulation unit, a first outlet, and a second outlet are provided on the effluent regulation unit; the advanced oxidation unit includes an ultraviolet reaction device; a hydrogen peroxide input port is provided on the ultraviolet reaction device; the outlet on the manganese sand filtration unit is connected to the inlet of the effluent regulation unit; the first outlet is connected to the inlet on the ultraviolet reaction device; the second outlet is used to discharge the final effluent; the outlet on the advanced oxidation unit is connected to the inlet on the manganese sand filtration unit; The manganese sand filtration unit includes a filtration layer, and the filtration layer is sequentially provided with a quartz sand layer and a manganese sand layer from top to bottom; The water purification treatment method includes the following steps: introducing the water source to be treated through the inlet of the manganese sand filtration unit, passing through the effluent regulation unit and entering the ultraviolet reaction device, and adding hydrogen peroxide to the ultraviolet reaction device for oxidation treatment; Then, the water treated by the oxidation treatment is output from the outlet of the ultraviolet reaction device, introduced into the manganese sand filtration unit, and the final effluent is discharged from the second outlet.

2. The water purification method according to claim 1, wherein, The water purification treatment system further includes a backwashing unit for backwashing the manganese sand filtration unit.

3. The water purification method according to claim 2, characterized in that, The backwashing unit includes a backwashing water pump and an air pressurizing device; the outlet of the backwashing water pump is connected to the manganese sand filtration unit through a backwashing water pipeline, and the air pressurizing device is connected to the manganese sand filtration unit through a backwashing air pipeline.

4. The water purification method according to claim 3, wherein The inlet of the backwashing water pump is connected to a third outlet provided on the effluent regulation unit.

5. The water purification method according to claim 3, characterized in that, The air pressurizing device is a backwashing air compressor and / or a backwashing blower.

6. The water purification method according to claim 1, characterized in that, The manganese sand filtration unit further includes a filtration tank, the filtration tank is provided with a plurality of filtration grids, and the filtration layer is provided in the filtration grids.

7. The water purification method according to claim 1, characterized in that The manganese sand filtration unit is further sequentially connected with a water collecting tank and a drainage tank for collecting and discharging wastewater.

8. The water purification method according to claim 1, characterized in that An inlet pipeline is connected to the inlet on the manganese sand filtration unit; and / or, the first outlet is connected to the inlet on the ultraviolet reaction device through a variable frequency water pump; and / or, a water outlet pipeline is connected to the second outlet.

9. The water purification method according to claim 1, characterized in that, The advanced oxidation unit further includes a hydrogen peroxide storage device for adding hydrogen peroxide to the ultraviolet reaction device.

10. The water purification method according to claim 9, characterized in that, The inlet on the manganese sand filtration unit is connected to the outlet on the ultraviolet reaction device through a first pipeline, and the outlet of the hydrogen peroxide storage device is communicated with the first pipeline.

11. The water purification method according to claim 9, characterized in that, The outlet of the hydrogen peroxide storage device is connected to the hydrogen peroxide input port through a second pipeline.

12. The water purification method according to claim 1, characterized in that, The water purification treatment system is arranged in upper and lower layers. The manganese sand filtration unit is arranged in the upper space, the effluent regulation unit is arranged in the lower space, and the advanced oxidation unit is arranged on one side of the effluent regulation unit.

13. The water purification method according to claim 12, characterized in that, When the advanced oxidation unit includes a hydrogen peroxide storage device, the ultraviolet reaction device in the advanced oxidation unit is arranged on one side of the effluent regulation unit; the hydrogen peroxide storage device is arranged in the upper space vertically corresponding to the ultraviolet reaction device.

14. The water purification method according to claim 12, wherein When the water purification treatment system includes a backwashing unit, and the backwashing unit includes a backwashing water pump and an air pressurizing device, the backwashing water pump is arranged in the lower space and on the other side of the effluent regulation unit; the air pressurizing device is arranged in the upper space vertically corresponding to the backwashing water pump; And / or, when the manganese sand filtration unit is sequentially connected with a water collection tank and a drainage tank, the water collection tank and the drainage tank are vertically arranged below the manganese sand filtration unit and are located in the upper space.

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