Sewage treatment resin regeneration waste liquid recycling system

Abstract

The utility model discloses a system for recycling resin regeneration waste liquid in sewage treatment. The system comprises a settling pond, an ammonia nitrogen removal resin tank, a nitrate radical removal resin tank, an air stripping tower, a nitrate radical removal waste liquid pipe and an ammonia nitrogen removal waste liquid pipe, an outlet of the sedimentation tank is connected with a wastewater inlet of the ammonia nitrogen removal resin tank, and a wastewater outlet of the ammonia nitrogen removal resin tank is connected with a wastewater inlet of the nitrate radical removal resin tank; one end of the nitrate radical removal waste liquid pipe is communicated with a regenerated waste liquid discharge pipe of the nitrate radical removal resin tank, and the other end of the nitrate radical removal waste liquid pipe is communicated with a regenerated liquid inlet pipe of the ammonia nitrogen removal resin tank; one end of the ammonia nitrogen removal waste liquid pipe is communicated with the ammonia nitrogen removal resin tank regeneration waste liquid discharge pipe, the other end of the ammonia nitrogen removal waste liquid pipe is connected with an inlet of the air stripping tower, and an outlet of the air stripping tower is communicated with the ammonia nitrogen removal resin tank regeneration liquid inlet pipe. The method has the advantages that the nitrate resin regeneration waste liquid can be recycled for ammonia nitrogen resin regeneration, the use of regeneration liquid is reduced, and water is saved.

Description

Technical field:

[0001] The utility model relates to the technical field of sewage treatment, in particular to a system for recycling waste liquid from sewage treatment resin regeneration. Background technology:

[0002] Sewage treatment plants conventionally use biochemical processes to treat sewage. When treating saline wastewater, it must meet discharge standards before it can be discharged. The total nitrogen content cannot be greater than 1 mg / L. Therefore, resin adsorption regeneration is often used to remove ammonia nitrogen and nitrate from wastewater. After ammonia nitrogen resin adsorption and nitrate resin adsorption, sodium chloride regeneration liquid is needed to regenerate the resin for continued adsorption. However, the amount of regeneration liquid used is large, and the amount of regeneration waste liquid discharged is also large. Therefore, the demand for water is large. In response to relevant policies on water conservation and emission reduction, new plans need to be formulated to reduce the use and discharge of regeneration liquid. Utility model content:

[0003] The purpose of the utility model is to provide a system for recycling waste liquid from sewage treatment resin regeneration.

[0004] The utility model is implemented by the following technical solutions:

[0005] A system for recycling waste liquid from wastewater treatment resin regeneration, comprising a sedimentation tank, an ammonia nitrogen removal resin tank, a nitrate removal resin tank, a stripping tower, a nitrate removal waste liquid pipe, and an ammonia nitrogen removal waste liquid pipe;

[0006] The regeneration waste liquid discharge pipe of the nitrate removal resin tank is provided with a first waste liquid valve;

[0007] A regeneration liquid valve is provided on the regeneration liquid inlet pipe of the ammonia nitrogen removal resin tank, and a second waste liquid valve is provided on the regeneration waste liquid discharge pipe of the ammonia nitrogen removal resin tank;

[0008] The outlet of the settling tank is connected to the wastewater inlet of the ammonia nitrogen removal resin tank, and the wastewater outlet of the ammonia nitrogen removal resin tank is connected to the wastewater inlet of the nitrate removal resin tank;

[0009] One end of the nitrate removal waste liquid pipe is communicated with the nitrate removal resin tank regeneration waste liquid discharge pipe between the first waste liquid valve and the nitrate removal resin tank through the nitrate removal waste liquid valve, and the other end of the nitrate removal waste liquid pipe is communicated with the ammonia nitrogen removal resin tank regeneration liquid inlet pipe between the regeneration liquid valve and the ammonia nitrogen removal resin tank;

[0010] One end of the ammonia nitrogen removal waste liquid pipe is connected to the ammonia nitrogen removal resin tank regeneration waste liquid discharge pipe between the second waste liquid valve and the ammonia nitrogen removal resin tank through an ammonia nitrogen removal waste liquid valve, the other end of the ammonia nitrogen removal waste liquid pipe is connected to the inlet of the stripping tower, and the outlet of the stripping tower is connected to the ammonia nitrogen removal resin tank regeneration liquid inlet pipe between the regeneration liquid valve and the ammonia nitrogen removal resin tank through a stripping regeneration liquid valve.

[0011] Preferably, it further comprises a dosing device, wherein there are multiple dosing devices, and the dosing ports are connected to the inlet of the sedimentation tank.

[0012] Preferably, it further comprises a residual liquid pipe, one end of which is connected to the outlet of the stripping tower between the stripping tower and the stripping regeneration liquid valve, and one end of which is connected to the inlet of the biochemical temporary storage tank; a residual liquid valve is provided on the residual liquid pipe.

[0013] The advantages of the utility model are as follows: 1. It adds high-efficiency precipitation in front of the ammonia nitrogen resin, effectively removes suspended matter, and increases the working exchange capacity of the ammonia nitrogen resin.

[0014] 2. The waste liquid from nitrate resin regeneration can be reused in the regeneration of ammonia nitrogen resin. The waste liquid from ammonia nitrogen resin regeneration is treated by stripping, mixed with the waste liquid from nitrate resin regeneration, and reused in the regeneration of ammonia nitrogen resin. The reciprocating cycle can reduce the use of regeneration liquid and save water. Description of the drawings:

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0017] In the figure: sedimentation tank 1, ammonia nitrogen removal resin tank 2, nitrate removal resin tank 3, stripping tower 4, nitrate removal waste liquid pipe 5, ammonia nitrogen removal waste liquid pipe 6, first waste liquid valve 7, regeneration liquid valve 8, second waste liquid valve 9, dosing device 10, nitrate removal waste liquid valve 11, ammonia nitrogen removal waste liquid valve 12, stripping regeneration liquid valve 13, residual liquid pipe 14, residual liquid valve 15. Specific implementation method:

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figure 1 As shown, a system for reusing waste liquid from wastewater treatment resin regeneration includes a sedimentation tank 1, an ammonia nitrogen removal resin tank 2, a nitrate removal resin tank 3, a stripping tower 4, a nitrate removal waste liquid pipe 5, and an ammonia nitrogen removal waste liquid pipe 6; the sedimentation tank 1 is a high-efficiency sedimentation tank; the regeneration waste liquid discharge pipe of the nitrate removal resin tank 3 is provided with a first waste liquid valve 7; the regeneration liquid inlet pipe of the ammonia nitrogen removal resin tank 2 is provided with a regeneration liquid valve 8, and the regeneration waste liquid discharge pipe of the ammonia nitrogen removal resin tank 2 is provided with a second waste liquid valve 9.

[0020] The outlet of the sedimentation tank 1 is connected to the wastewater inlet of the ammonia nitrogen removal resin tank 2, and the wastewater outlet of the ammonia nitrogen removal resin tank 2 is connected to the wastewater inlet of the nitrate removal resin tank 3; the conventional treatment process of saline wastewater: the saline wastewater first enters the sedimentation tank 1, and the suspended matter is removed after precipitation, and then enters the ammonia nitrogen removal resin tank 2, through the strong acid cation resin, conventionally, the ammonia nitrogen is removed by adsorbing the sulfonic acid group (essentially, the sodium ions on the resin are exchanged with the ammonia nitrogen in the wastewater), and the resin is regenerated by the sodium chloride brine introduced so that it can continue to adsorb, and then after the ammonia nitrogen is removed from the wastewater, it enters the nitrate removal resin tank 3, and the weak acid anion exchange resin, conventionally, can adsorb nitrate (essentially, chloride ions are exchanged with nitrate in the wastewater) to remove nitrate, and the sodium chloride brine is also introduced to regenerate the resin so that it can continue to adsorb, and finally tested, the ammonia nitrogen and nitrate content is discharged after it drops to qualified.

[0021] The water treatment system further comprises a dosing device 10. There are multiple dosing devices 10, and the drug outlet is connected to the inlet of the sedimentation tank 1. Preferably, there are three dosing devices 10, each of which is equipped with sodium hydroxide, PFS (polyferric sulfate), and PAM (polyacrylamide), which are all commonly used flocculants in the water treatment industry. The purpose of adding is: (1) to remove suspended matter (calcium, magnesium and other substances). Suspended matter will affect the subsequent resin adsorption and cause pollution and blockage; (2) ammonia nitrogen resin is a strong acid cationic resin. This type of resin has no selectivity for cations, that is, it absorbs calcium, magnesium, ammonia and nitrogen, so calcium and magnesium are removed first to increase the capacity of the ammonia nitrogen resin to adsorb ammonia nitrogen.

[0022] One end of the nitrate removal waste liquid pipe 5 is connected to the regeneration waste liquid discharge pipe of the nitrate removal resin tank 3 between the first waste liquid valve 7 and the nitrate removal resin tank 3 through the nitrate removal waste liquid valve 11, and the other end of the nitrate removal waste liquid pipe 5 is connected to the regeneration liquid inlet pipe of the ammonia nitrogen removal resin tank 2 between the regeneration liquid valve 8 and the ammonia nitrogen removal resin tank 2;

[0023] Since the regeneration liquid introduced into the nitrate removal resin tank 3 is sodium chloride brine with 7% sodium chloride, the regeneration waste liquid discharged from the nitrate removal resin tank 3 is a mixed liquid whose main components are sodium chloride and sodium nitrate. The sodium ions in the mixed waste liquid are actually not lost and can be used as the regeneration liquid of the ammonia nitrogen removal resin tank 2, and enters the ammonia nitrogen removal resin tank 2 through the nitrate removal waste liquid pipe 5.

[0024] One end of the ammonia nitrogen removal waste liquid pipe 6 is connected to the regeneration waste liquid discharge pipe of the ammonia nitrogen removal resin tank 2 between the second waste liquid valve 9 and the ammonia nitrogen removal resin tank 2 through the ammonia nitrogen removal waste liquid valve 12, and the other end of the ammonia nitrogen removal waste liquid pipe 6 is connected to the inlet of the stripping tower 4, and the outlet of the stripping tower 4 is connected to the regeneration liquid inlet pipe of the ammonia nitrogen removal resin tank 2 between the regeneration liquid valve 8 and the ammonia nitrogen removal resin tank 2 through the stripping regeneration liquid valve 138;

[0025] The regenerated waste liquid discharged from the nitrate removal resin tank 3 enters the ammonia nitrogen removal resin tank 2 for regeneration. The discharged regenerated waste liquid is mainly composed of sodium chloride, sodium nitrate, and ammonium ions, and then passes into the stripping tower 4. The ammonium ions are enriched in the wastewater, so an alkali stripping method is used in the stripping tower 4 to remove ammonia nitrogen. The treated water is compared with the original 7% sodium chloride sodium chloride brine, and the concentration of sodium chloride is reduced. However, after mixing with the nitrate regeneration waste liquid, it can be used as the regeneration liquid of the ammonia nitrogen removal resin tank 2 again, and the cycle is repeated.

[0026] It also includes a residual liquid pipe 14, one end of which is connected to the outlet of the stripping tower 4 between the stripping tower 4 and the stripping regeneration liquid valve, and one end of the residual liquid pipe 14 is connected to the inlet of the biochemical temporary storage tank; a residual liquid valve 15 is provided on the residual liquid pipe 14.

[0027] Since the regeneration liquid of the nitrate removal resin tank 3 is replenished, and the regeneration liquid of the ammonia nitrogen removal resin tank 2 is obtained by waste liquid circulation, the amount of regeneration waste liquid in the entire system is gradually increasing, so part of the regeneration waste liquid can be regularly discharged through the residual liquid pipe 14 to the biochemical temporary storage tank of the biochemical treatment unit for subsequent treatment.

[0028] Working principle: When the utility model is in use, the saline wastewater first enters the sedimentation tank 1, where sodium hydroxide, PFS (polyferric sulfate) and PAM (polyacrylamide) are added. After sedimentation, the suspended solids are removed. Then the wastewater enters the ammonia nitrogen removal resin tank 2, where ammonia nitrogen is removed by exchange with the ammonia nitrogen resin. After that, the wastewater enters the nitrate removal resin tank 3, where nitrate is removed by exchange with the nitrate resin. Finally, the wastewater is discharged after the ammonia nitrogen and nitrate content drops to the qualified level.

[0029] During this period, 7% sodium chloride brine is used as the regeneration liquid of nitrate resin. The waste liquid after regeneration is a mixture of sodium chloride and sodium nitrate. The sodium ions of the mixed waste liquid are not actually lost, so it can continue to be used as the regeneration liquid of ammonia nitrogen resin.

[0030] Close the first waste liquid valve 7 and the regeneration liquid valve 8, open the nitrate removal waste liquid valve 11, and the regeneration waste liquid of the nitrate resin enters the ammonia nitrogen removal resin tank 2 through the nitrate removal waste liquid pipe 5.

[0031] After regeneration, the main components of the wastewater of ammonia nitrogen resin become sodium chloride, sodium nitrate and ammonium ions. The ammonium ions are enriched in the wastewater, so the alkali stripping method is used to remove the ammonia nitrogen. At this time, the concentration of sodium chloride in the treated water is lower than that of the original 7% sodium chloride regeneration liquid. However, after mixing with the regeneration wastewater of nitrate, it can be used as ammonia nitrogen regeneration liquid again, and the cycle is repeated.

[0032] Close the second waste liquid valve 9 and the stripping regeneration liquid valve 13, open the ammonia nitrogen removal waste liquid valve 12, and the regeneration waste liquid of the ammonia nitrogen resin enters the stripping tower 4 through the ammonia nitrogen removal waste liquid pipe 6, and then mixes with the regeneration waste liquid of the nitrate resin and returns to the ammonia nitrogen removal resin tank 2.

[0033] During the whole process, the amount of regeneration waste liquid in the system gradually increases. Part of the regeneration waste liquid can be regularly discharged from the residual liquid pipe 14 to the biochemical treatment unit for treatment, which can be achieved by closing the stripping regeneration liquid valve 13 and opening the residual liquid valve 15.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A system for recycling wastewater from sewage treatment resin regeneration, characterized in that: Including sedimentation tank, ammonia nitrogen removal resin tank, nitrate removal resin tank, stripping tower, nitrate removal waste liquid pipe, ammonia nitrogen removal waste liquid pipe; The regeneration waste liquid discharge pipe of the nitrate removal resin tank is provided with a first waste liquid valve; A regeneration liquid valve is provided on the regeneration liquid inlet pipe of the ammonia nitrogen removal resin tank, and a second waste liquid valve is provided on the regeneration waste liquid discharge pipe of the ammonia nitrogen removal resin tank; The outlet of the settling tank is connected to the wastewater inlet of the ammonia nitrogen removal resin tank, and the wastewater outlet of the ammonia nitrogen removal resin tank is connected to the wastewater inlet of the nitrate removal resin tank; One end of the nitrate removal waste liquid pipe is communicated with the nitrate removal resin tank regeneration waste liquid discharge pipe between the first waste liquid valve and the nitrate removal resin tank through the nitrate removal waste liquid valve, and the other end of the nitrate removal waste liquid pipe is communicated with the ammonia nitrogen removal resin tank regeneration liquid inlet pipe between the regeneration liquid valve and the ammonia nitrogen removal resin tank; One end of the ammonia nitrogen removal waste liquid pipe is connected to the ammonia nitrogen removal resin tank regeneration waste liquid discharge pipe between the second waste liquid valve and the ammonia nitrogen removal resin tank through an ammonia nitrogen removal waste liquid valve, the other end of the ammonia nitrogen removal waste liquid pipe is connected to the inlet of the stripping tower, and the outlet of the stripping tower is connected to the ammonia nitrogen removal resin tank regeneration liquid inlet pipe between the regeneration liquid valve and the ammonia nitrogen removal resin tank through a stripping regeneration liquid valve.

2. The system for recycling wastewater from sewage treatment resin regeneration according to claim 1, characterized in that: It also includes a dosing device, which is multiple and has a drug outlet connected to the inlet of the sedimentation tank.

3. The system for recycling wastewater from sewage treatment resin regeneration according to claim 1, characterized in that: It also includes a residual liquid pipe, one end of which is connected to the outlet of the stripping tower between the stripping tower and the stripping regeneration liquid valve, and one end of which is connected to the inlet of the biochemical temporary storage tank; a residual liquid valve is provided on the residual liquid pipe.

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