A denitrification resin regeneration system

Abstract

The present invention relates to the technical field of sewage treatment, and specifically to a denitrification resin regeneration system, comprising a resin regenerator, a regeneration brine system connected to the water inlet end of the resin regenerator, a regeneration waste liquid pool connected to the water outlet end of the resin regenerator, and an air compression system for filling the corresponding pipeline. The resin regenerator comprises a tank body, an upper water / air pipe is arranged on the upper part of the tank body, the upper water / air pipe is connected to a plurality of upper water / air branch pipes, a lower water / air pipe is arranged at the bottom of the tank body, the lower water / air pipe is connected to a plurality of lower water / air branch pipes, the upper water / air branch pipes and the lower water / air branch pipes are arranged in an interlaced manner, the regeneration brine system is respectively connected to the upper water / air pipe and the lower water / air pipe, and the air compression system is respectively connected to the upper water / air pipe and the lower water / air pipe. The denitrification resin regeneration system of the present invention can use compressed air to stir the resin to prevent the resin from being hardened, and the regeneration effect is good. The water / air distribution resistance is small, and energy consumption is saved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a denitrification resin regeneration system. Background Art

[0002] The total nitrogen in the tail water discharged from urban sewage treatment plants is mainly nitrate nitrogen. At present, the nitrate nitrogen removal technologies are mainly divided into biological methods, membrane separation methods, resin ion exchange methods, etc. Compared with other technologies, the resin adsorption ion exchange denitrification method has the characteristics of mature technology, simple regeneration, convenient operation and management, high degree of nitrate removal, and low operating costs, making this technology an important technology for deep denitrification of sewage treatment.

[0003] In commonly used resin denitrification equipment, the resin is filled inside the equipment. As the use time increases, the resin is easy to harden, the regeneration effect is poor, the regeneration agent dosage is high, and the flushing water volume is large. Commonly used resin denitrification equipment uses a water distribution cap to distribute water, and the water distribution and drainage area is limited, the operation resistance is large, and the energy consumption is high. In order to overcome the above problems, it is necessary to develop a denitrification resin regeneration device with good regeneration effect, low regeneration agent dosage, small flushing water volume, and low energy consumption. Summary of the invention

[0004] The object of the present invention is to provide a denitrification resin regeneration system, which has good regeneration effect, prevents resin from hardening and saves energy consumption.

[0005] The scheme adopted by the present invention to achieve the purpose is: a denitrification resin regeneration system, including a resin regenerator, a regeneration brine system connected to the water inlet end of the resin regenerator through a pipeline, a regeneration waste liquid pool connected to the water outlet end of the resin regenerator through a pipeline, and an air compression system for filling the corresponding pipeline. The resin regenerator includes a tank body, an upper water / air pipe is arranged on the upper part of the tank body, and the upper water / air pipe is connected to a plurality of upper water / air branch pipes, and a lower water / air pipe is arranged at the bottom of the tank body. The lower water / air pipe is connected to a plurality of lower water / air branch pipes, and the upper water / air branch pipes and the lower water / air branch pipes are arranged in an alternating manner. The regeneration brine system is respectively connected to the upper water / air pipe and the lower water / air pipe, and the air compression system is respectively connected to the upper water / air pipe and the lower water / air pipe.

[0006] Preferably, the resin regenerator further comprises a head detachably arranged on the top of the tank body, a saturated resin inlet arranged on one side of the tank body, and a regenerated resin discharge port arranged on the bottom of the tank body.

[0007] Preferably, the upper water distribution / gas branch pipe and the lower water distribution / gas branch pipe are provided with a plurality of pores, and the pores are smaller than the diameter of the resin particles.

[0008] Preferably, there are at least two water / gas supply pipes, which are arranged in parallel, and each water / gas supply pipe is connected to at least three upper water / gas distribution pipes.

[0009] Preferably, there are at least two water / gas pipes, which are arranged in parallel, and each water / gas pipe is connected to at least four lower water / gas distribution pipes.

[0010] Preferably, the regenerated resin discharge port is designed in a bucket shape.

[0011] Preferably, the side wall of the tank body is also provided with a sight glass.

[0012] The present invention has the following advantages and beneficial effects:

[0013] The denitrification resin regeneration system of the present invention can use compressed air to stir the resin to prevent the resin from hardening, and the regeneration effect is good. The resin is regenerated in the water cleaning device, and the regenerated resin is transported effectively. The gap area between the upper water distribution / gas branch pipe and the lower water distribution / gas branch pipe is large, the water distribution / gas distribution resistance is small, and energy consumption is saved.

[0014] The denitrification resin regeneration device of the present invention is provided with an upper water distribution / gas branch pipe and a lower water distribution / gas branch pipe which are staggered and evenly arranged, intercepting the resin and evenly distributing the salt water and the cleaning water, and achieving a good resin salt water regeneration effect. The upper water distribution / gas branch pipe and the lower water distribution / gas branch pipe can not only simultaneously introduce air and water, but also utilize compressed air to accelerate the resin drainage and the discharge of the regeneration liquid, shorten the regeneration time, and save the amount of salt and cleaning water. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : A schematic structural diagram of a denitrification resin regeneration system of the present invention;

[0016] Figure 2 : A schematic diagram of the structure of the denitrification resin regeneration device in the present invention;

[0017] Figure 3 : Another structural schematic diagram of the denitrification resin regeneration device in the present invention;

[0018] In the figure: 1. Head, 2. Tank body, 3. Water / gas pipe, 4. Saturated resin inlet, 5. Upper water / gas branch pipe, 6. Lower water / gas branch pipe, 7. Sight glass, 8. Lower water / gas branch pipe, 9. Lower water / gas pipe, 10. Regeneration resin discharge port, 11. Support foot, B1. Cleaning water pump, B2. Brine pump, B3. Saturated resin pump, B4. Regeneration resin pump, F1~F10. Automatic valve. DETAILED DESCRIPTION

[0019] For a better understanding of the present invention, the following examples are provided to further illustrate the present invention, but the present invention is not limited to the following examples.

[0020] Example 1

[0021] like Figure 1-3As shown, a denitrification resin regeneration system includes a resin regenerator, a regeneration brine system connected to the water inlet end of the resin regenerator through a pipeline, a regeneration waste liquid pool connected to the water outlet end of the resin regenerator through a pipeline, and an air compression system for filling the corresponding pipeline. The resin regenerator includes a tank body 2, a head 1 detachably arranged on the top of the tank body 2, a saturated resin inlet 4 arranged on one side of the tank body 2, and a regeneration resin discharge port 10 arranged at the bottom of the tank body 2. An upper water / air pipe 3 is arranged on the upper part of the tank body 2, and the upper water / air pipe 3 is connected to a plurality of upper water distribution / air branch pipes 5. A lower water / air pipe 9 is arranged at the bottom of the tank body 2, and the lower water / air pipe 9 is connected to a plurality of lower water distribution / air branch pipes 6. The upper water distribution / air branch pipes 5 and the lower water distribution / air branch pipes 5 are arranged alternately.

[0022] During the resin regeneration process, the regeneration brine system injects regeneration brine into the resin regenerator through a pipeline to regenerate the resin. At the same time, the air compression system injects compressed air into the resin regenerator through a pipeline to further use compressed air to accelerate the resin drainage and regeneration liquid discharge, shorten the regeneration time, and save the amount of salt and cleaning water. In addition, compressed air can be used to stir the resin to prevent the resin from hardening, and the regeneration effect is good. The regenerated resin in the water cleaning device has a good regeneration resin transportation effect.

[0023] The upper water distribution / gas branch pipe 5 and the lower water distribution / gas branch pipe 6 of the denitrification resin regeneration device are staggered and evenly arranged, intercepting the resin and evenly distributing the brine and the cleaning water, and achieving a good resin brine regeneration effect. The upper water distribution / gas branch pipe 5 and the lower water distribution / gas branch pipe 6 can not only simultaneously pass air and water, but also have a large gap area, small water distribution / gas distribution resistance, and energy saving.

[0024] In this embodiment, the upper water distribution / gas branch pipe 5 and the lower water distribution / gas branch pipe 6 are provided with a plurality of pores, and the pores are smaller than the diameter of the resin particles.

[0025] The pore diameter is smaller than the resin particle size to prevent the resin from flowing back into the upper water distribution / gas branch pipe 5 and the lower water distribution / gas branch pipe 6 to cause waste and block the pores.

[0026] In this embodiment, there are at least two water / gas supply pipes 3 , which are arranged in parallel, and each water / gas supply pipe 3 is connected to at least three upper water / gas distribution pipes 5 .

[0027] In this embodiment, there are at least two water / gas pipes 9, which are arranged in parallel, and each water / gas pipe 9 is connected to at least four lower water / gas branch pipes 6. The water / gas pipe 9 is connected to the lower water / gas branch pipe 6 through the water / gas branch pipe 8, and the water / gas branch pipe 8 is arranged outside the tank body 2, and no holes are arranged on the pipe wall.

[0028] The upper water / air pipe 3 and the lower water / air pipe 9 are respectively arranged at the top and the bottom of the tank body 2. When the regenerated brine enters from the lower water / air pipe 9 below, the water inlet of the upper water / air pipe 3 is closed, and the regeneration waste liquid is discharged through the upper water / air pipe 3. When the regenerated brine enters from the upper water / air pipe 3 above, the water inlet of the lower water / air pipe 9 is closed, and the regeneration waste liquid is discharged through the lower water / air pipe 9. The regenerated brine entering through the upper water / air pipe 3 or the lower water / air pipe 9 is then distributed with water and air through the corresponding upper water distribution / air branch pipe 5 or the lower water distribution / air branch pipe 6 to uniformly regenerate the resin. In other embodiments, the upper water / air pipe 3, the lower water / air pipe 9, the upper water distribution / air branch pipe 5 and the lower water distribution / air branch pipe 6 can also be set as needed in a quantity that meets the use requirements.

[0029] In this embodiment, the regenerated resin discharge port 10 is designed in a bucket shape.

[0030] The regenerated resin discharge port 10 is designed to be bucket-shaped to facilitate the discharge and collection of the regenerated resin.

[0031] In this embodiment, a viewing mirror 7 is also provided on the side wall of the tank body.

[0032] The resin condition in the tank can be observed at any time through the sight glass 7 to avoid resin hardening.

[0033] In this embodiment, a supporting foot 11 is provided at the bottom of the tank body 2 .

[0034] The upper water / gas branch pipe 5 and the lower water / gas branch pipe 6 of the device of the present invention are staggered and evenly arranged, and the upper water / gas branch pipe 5 and the lower water / gas branch pipe 6 are provided with a plurality of pores, which are smaller than the resin particle size, intercepting the resin and achieving the purpose of uniform water distribution and uniform gas distribution.

[0035] The device has good regeneration effect, low regeneration agent consumption, small flushing water consumption and low energy consumption.

[0036] Example 2

[0037] The regeneration process of the denitrification resin regeneration system is as follows:

[0038] (I) Feeding

[0039] Normally closed valves are used, B3, F4, and F8 are opened, and other valves are closed. The saturated resin and water mixture is transported by the saturated resin pump B3, enters the resin regenerator through F4 and the saturated resin inlet 4, and the saturated resin is intercepted by the lower water distribution / gas branch pipe 6. The water is discharged in sequence through the lower water distribution / gas branch pipe 6, the lower inlet / discharge branch pipe 8, the lower water / gas pipe 9 and F8;

[0040] (2) Drain

[0041] F7, F2, and F8 are opened, and the other valves are closed, and the compressed air in the air tank is used to accelerate the discharge of water in the resin regenerator.

[0042] (III) Regeneration

[0043] 1. Pre-desorption

[0044] B2, F3, F6, F5 are opened, and the other valves are closed. 6% to 8% sodium chloride solution is transported by brine pump B2 and then uniformly enters the resin regenerator through F3, F6, lower water / gas pipe 9, lower inlet / discharge branch pipe 8, and lower water / gas branch pipe 6. The regeneration flow rate is 15BV / H and the regeneration time is 5min.

[0045] 2. Intermittent air stirring

[0046] F7, F6, and F5 are opened, and the other valves are closed. The compressed air in the air storage tank enters the device evenly through F7, F6, the lower water / gas pipe 9, the lower inlet / discharge branch pipe 8, and the lower water / gas distribution branch pipe 6 in turn. The resin is stirred by compressed air, and the resin and brine are fully in contact, which accelerates the desorption of the resin.

[0047] 3. Countercurrent regeneration

[0048] B2, F3, F6, F5 are opened, and the other valves are closed. 6% to 8% sodium chloride solution is transported by brine pump B2 and then uniformly enters the resin regenerator through F3, F6, lower water / gas pipe 9, lower inlet / discharge branch pipe 8, and lower water / gas branch pipe 6. The regeneration flow rate is 2BV / H, and the regeneration time is 40min.

[0049] 4. Regeneration liquid discharge

[0050] F7, F2, and F9 are opened, and the other valves are closed. The compressed air in the air tank is used to accelerate the discharge of the regeneration liquid of the device.

[0051] 5. Cleaning

[0052] B1, F1, F2, F9 are opened, and the other valves are closed. The water discharged after resin denitrification is used as the cleaning water source, which is transported by the cleaning water pump B1 and evenly enters the device through F1, F2, upper water / gas pipe 3, and upper water / gas branch pipe 5. The cleaning flow rate is 15BV / H and the cleaning time is 30min.

[0053] (IV) Recycled resin transportation

[0054] B4 and F10 are turned on, and the regenerated resin is transported with water through the regenerated resin pump B4. B1, F1, and F2 are turned on intermittently to use cleaning water to speed up the transport of regenerated resin.

[0055] The nitrate selective ion exchange resin of this embodiment is a macroporous anion nitrate ion resin, which has a spherical particle appearance, a polystyrene copolymer skeleton, a quaternary amine functional group, a particle size range of 0.3 to 1.2 mm, and a total exchange capacity of 1000 mol / m 3Chlorine type, water content is 52±3% chlorine type, loading density is 700-750g / l.

[0056] The above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and changes can be made without departing from the principle of the present invention, and these improvements and changes are also regarded as the protection scope of the present invention.

Claims

1. A denitrification resin regeneration system, characterized in that: It includes a resin regenerator, a regeneration brine system connected to the water inlet of the resin regenerator through a pipeline, a regeneration waste liquid pool connected to the water outlet of the resin regenerator through a pipeline, an air compression system used to fill the pipeline, and the water discharged after resin denitrification is used as a cleaning water source. The resin regenerator includes a tank body, an upper water / air pipe is arranged on the upper part of the tank body, and the upper water / air pipe is connected to a plurality of upper water distribution / air branch pipes, and a lower water / air pipe is arranged at the bottom of the tank body. The lower water / air pipe is connected to a plurality of lower water distribution / air branch pipes, and the upper water distribution / air branch pipes and the lower water distribution / air branch pipes are arranged in a staggered manner. The regeneration brine system is respectively connected to the upper water / air pipe and the lower water / air pipe, and the air compression system is respectively connected to the upper water / air pipe and the lower water / air pipe; the upper water distribution / air branch pipe and the lower water distribution / air branch pipe are provided with a plurality of pores, and the pores are smaller than the resin particle size.

2. The denitrification resin regeneration system according to claim 1, characterized in that: The resin regenerator also includes a sealing head detachably arranged on the top of the tank body, a saturated resin inlet arranged on one side of the tank body, and a regenerated resin discharge port arranged on the bottom of the tank body.

3. The denitrification resin regeneration system according to claim 1, characterized in that: There are at least two water / gas supply pipes, which are arranged in parallel, and each water / gas supply pipe is connected to at least three upper water / gas distribution pipes.

4. The denitrification resin regeneration system according to claim 1, characterized in that: There are at least two water / gas pipes, which are arranged in parallel, and each water / gas pipe is connected to at least four lower water / gas distribution pipes.

5. The denitrification resin regeneration system according to claim 2, characterized in that: The regenerated resin discharge port is designed in a bucket shape.

6. The denitrification resin regeneration system according to claim 1, characterized in that: The side wall of the tank body is also provided with a sight glass.

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