Resin regeneration waste liquid treatment system

Abstract

The utility model provides a resin regeneration waste liquid treatment system which comprises a water outlet tank, a filter assembly, a resin adsorption tower and a softened water treatment assembly which are sequentially connected in series through pipelines, and the softened water treatment assembly is communicated with the water outlet tank through a return pipe and comprises a softening tank and a coagulation and flocculation unit which are sequentially connected in series through pipelines. According to the utility model, the hardness of the resin regeneration liquid can be reduced, the impact of the resin regeneration liquid on the front-end process can be reduced, the operation load of the front-end process section can be reduced, the medicament dosage of the front-end process section can be reduced, and the device has the advantages of stable operation effect, system impact reduction and operation cost reduction.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, especially a resin regeneration waste liquid treatment system. BACKGROUND

[0002] After the ion exchange resin is saturated, resin regeneration is needed. The resin regeneration produces waste liquid, and the resin regeneration waste liquid is a kind of toxic and harmful waste, which will have certain influence on environment and human body if not handled properly. First, the resin regeneration waste liquid contains a large amount of organic matter, which will cause eutrophication of water body and destroy water ecological balance if directly discharged into water body. Secondly, the resin regeneration waste liquid may also contain harmful substances such as heavy metals, which will have certain influence on environment and human health.

[0003] At present, there is also a method of recycling the resin regeneration waste liquid back to the front end of the system, but resin regeneration is intermittent, the water volume of resin regeneration waste liquid is large, the hardness is often very high and contains a large amount of acid and alkali. Once recycled back to the front end of the system, it will cause great impact on the front-end process, and further affect the effluent quality of the front-end process section, making the whole system unstable, and also easily causing the resin to be frequently saturated. Secondly, due to the high hardness of the resin regeneration waste liquid entering the front end, the water quality of the front end fluctuates, affecting the hardness concentration of the front-end water, leading to frequent adjustment of the dosage of reagent, and the dosage is large. The control requirement of the dosage of the front-end process is high. Once the dosage fluctuates, the hardness of the ion exchange resin water will increase, which is easy to cause the resin to be frequently saturated, and the regeneration frequency increases, and further forms a vicious cycle, causing the cost of reagent to increase. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a resin regeneration waste liquid treatment system, which can reduce the hardness of resin regeneration liquid, reduce the impact of resin regeneration liquid on the front-end process, reduce the operation load of the front-end process section, reduce the dosage of reagent of the front-end process section, and has the advantages of stable operation effect, reducing system impact and reducing operation cost.

[0005] In order to achieve the above purpose, the utility model provides a resin regeneration waste liquid treatment system, which comprises: a water outlet pool, a filter assembly, a resin adsorption tower and a softened water treatment assembly connected in sequence through pipeline, the softened water treatment assembly is communicated with the water outlet pool through reflux pipe, and the softened water treatment assembly comprises a softening pool and a coagulation and flocculation unit connected in sequence through pipeline.

[0006] Optionally, the coagulation and flocculation unit comprises a coagulation pool, a flocculation pool and a sedimentation pool connected in sequence through pipeline.

[0007] Optionally, the softened water treatment assembly comprises a sodium carbonate dosing assembly and a sodium hydroxide dosing assembly, the dosing port of the sodium carbonate dosing assembly being connected to the softening tank, and the dosing port of the sodium hydroxide dosing assembly being connected to the softening tank.

[0008] Optionally, the softened water treatment assembly comprises a pH readjusting tank, the pH readjusting tank being in communication with the coagulation and flocculation unit and located in the downstream direction of the coagulation and flocculation unit.

[0009] Optionally, the resin regeneration waste liquid treatment system comprises a sludge treatment assembly, the sludge treatment assembly comprising a sludge concentration tank and a dewatering unit in communication through pipelines, the sludge concentration tank being in communication with the softened water treatment assembly through pipelines for collecting and treating the sludge of the softened water treatment assembly.

[0010] Optionally, the resin regeneration waste liquid treatment system comprises a high-density tank, the water outlet end of the high-density tank being in communication with the water outlet tank through pipelines, and the sludge outlet end of the high-density tank being in communication with the sludge concentration tank through pipelines.

[0011] Optionally, the resin regeneration waste liquid treatment system comprises a backwashing pipeline, the resin adsorption tower and the filter assembly being in communication with the high-density tank through the backwashing pipeline to deliver backwashing water to the high-density tank for treatment.

[0012] Optionally, the filter assembly comprises a shallow sand filter, an ozone tower, an activated carbon filter and an ultrafiltration device in series through pipelines, the ultrafiltration device being in communication with the resin adsorption tower through pipelines.

[0013] Optionally, the resin regeneration waste liquid treatment system comprises a regenerated liquid neutralization tank, the regenerated liquid neutralization tank being in communication with the resin adsorption tower through pipelines, the regenerated liquid neutralization tank being in communication with the softening tank through pipelines, and the regenerated liquid neutralization tank being located between the resin adsorption tower and the softening tank.

[0014] Optionally, the resin regeneration waste liquid treatment system comprises a regenerated liquid collection tank, the regenerated liquid collection tank being in communication with the outlet end of the resin adsorption tower, and the regenerated liquid collection tank being in communication with the inlet end of the regenerated liquid neutralization tank.

[0015] As configured above, the resin regeneration waste liquid treatment system of the present application avoids frequent adjustment of the dosage of the medicament, reduces the control requirement of the dosage of the medicament for the front-end process, simplifies the operation of the water treatment system, and has the advantages of stable operation effect, reduced system impact and reduced operation cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Those skilled in the art should understand that the provided drawings are used to better understand the present application, and do not constitute any limitation on the scope of the present application. Among them:

[0017] Figure 1 is a schematic diagram of the resin regeneration waste liquid treatment system of an embodiment of the present application. DETAILED DESCRIPTION

[0018] In this article, unless otherwise stated, the terms "up", "down", "left", "right", "in", "out", "front", "back", "top", "bottom", etc. are used to indicate the orientation or positional relationship based on the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific orientation and operation, therefore it cannot be understood as a limitation on the present application.

[0019] The specific embodiments of the present application will be described in more detail below in conjunction with the schematic drawings. The advantages and features of the present application will be clearer according to the following description. It should be noted that the drawings are very simplified and use non-precise proportions, only to facilitate, clearly assist in explaining the purpose of the embodiments of the present application.

[0020] Figure 1 is a schematic diagram of the resin regeneration waste liquid treatment system of an embodiment of the present application. Please refer to Figure 1 The resin regeneration waste liquid treatment system provided by the embodiment of the present application comprises a water outlet pool, a filter assembly, a resin adsorption tower and a softened water treatment assembly which are sequentially connected by pipelines in series, the softened water treatment assembly is communicated with the water outlet pool through a reflux pipe, the softened water treatment assembly comprises a softening pool and a coagulation and flocculation unit which are sequentially connected by pipelines in series, the coagulation and flocculation unit comprises a coagulation pool, a flocculation pool and a sedimentation pool which are sequentially connected by pipelines in series. The softened water treatment assembly comprises a sodium carbonate dosing assembly and a sodium hydroxide dosing assembly, the dosing port of the sodium carbonate dosing assembly leads to the softening pool, the dosing port of the sodium hydroxide dosing assembly leads to the softening pool, for removing the calcium and magnesium hardness in the liquid in the softening pool and adjusting the pH value of the liquid in the softening pool to 11.3-12.0.

[0021] The softened water treatment assembly further comprises a pH reversion tank, which is in communication with the coagulation and flocculation unit and located in the downstream direction of the coagulation and flocculation unit. Specifically, the pH reversion tank is in communication with the sedimentation tank and is used to receive the supernatant of the sedimentation tank.

[0022] Further, the resin regeneration waste liquid treatment system further comprises a clean water tank, the inlet end of the clean water tank is in communication with the pH reversion tank, and the outlet end of the clean water tank is in communication with the water outlet tank. The clean water tank plays a role of collecting, storing and adjusting the water volume. As described above, the softened water treatment assembly is in communication with the water outlet tank through a reflux pipe, which can also pass through the clean water tank and then reach the water outlet tank. Exemplarily, the residence time of the liquid in the clean water tank is not less than 40 min.

[0023] Preferably, the resin regeneration waste liquid treatment system comprises a sludge treatment assembly, which comprises a sludge concentration tank and a dewatering unit in communication through pipelines. The sludge concentration tank is in communication with the softened water treatment assembly through pipelines and is used to collect and treat the sludge of the softened water treatment assembly. For example, the sludge concentration tank can be in communication with the coagulation tank, the flocculation tank and the sedimentation tank through pipelines to receive the sludge, and the sludge concentration tank can perform settlement concentration treatment on the sludge. The dewatering unit is used to receive the sludge delivered by the sludge concentration tank and dewater the sludge to a water content of less than 60%, and is regularly transported for treatment. The dewatering unit can be a filter press, for example.

[0024] The resin regeneration waste liquid treatment system comprises a high-density tank, the water outlet end of the high-density tank is in communication with the water outlet tank through pipelines, and the sludge outlet end of the high-density tank is in communication with the sludge concentration tank through pipelines. It can be understood that the sludge of the high-density tank is also delivered to the sludge concentration tank for treatment.

[0025] Further, the filtration assembly comprises a shallow sand filter, an ozone tower, an activated carbon filter and an ultrafiltration device in series through pipelines. The ultrafiltration device is in communication with the resin adsorption tower through pipelines, and the shallow sand filter is in communication with the water outlet end of the water outlet tank through pipelines. The shallow sand filter can remove suspended solids, the ozone tower and the activated carbon filter can degrade COD (chemical oxygen demand), and the outlet end of the ultrafiltration device is in communication with the activated carbon filter for further filtration treatment.

[0026] Preferably, the resin regeneration waste liquid treatment system comprises a regeneration liquid neutralization tank, which is in communication with the resin adsorption tower through pipelines and is in communication with the softening tank through pipelines and located between the resin adsorption tower and the softening tank. The resin regeneration waste liquid treatment system comprises a regeneration liquid collection tank, which is in communication with the outlet end of the resin adsorption tower and is in communication with the inlet end of the regeneration liquid neutralization tank. The regeneration liquid collection tank plays a role of collecting, storing and adjusting the water volume.

[0027] The resin regeneration waste liquid treatment system comprises a backwashing pipeline, a resin adsorption tower and a filter assembly are communicated with the high-density tank through the backwashing pipeline to deliver backwashing water to the high-density tank for treatment. For example, a shallow sand filter, an ozone tower, an activated carbon filter and an ultrafiltration device are communicated with the backwashing pipeline.

[0028] The resin regeneration steps comprise backwashing, acid regeneration, acid replacement, alkali regeneration and alkali replacement. For example, the acid regeneration uses 31% concentrated hydrochloric acid, and the alkali regeneration uses 32% concentrated sodium hydroxide. The backwashing water of the resin adsorption tower is delivered to the high-density tank through the backwashing pipeline for treatment, and the acid regeneration waste liquid, the acid replacement liquid, the alkali regeneration waste liquid and the alkali replacement waste liquid are delivered to the regeneration liquid collection tank. In this embodiment, the acid regeneration waste liquid, the acid replacement liquid, the alkali regeneration waste liquid and the alkali replacement waste liquid are collectively referred to as regeneration liquid.

[0029] Based on another aspect of the present application, the present application further provides a resin regeneration waste liquid treatment method applied to the resin regeneration waste liquid treatment system as above. The resin regeneration waste liquid treatment method comprises steps S1, S2 and S3, which will be described in detail below.

[0030] Step S1: The resin adsorption tower produces regeneration liquid.

[0031] Step S2: The regeneration liquid is sequentially introduced into a softening water treatment assembly, a water outlet tank and a filter assembly.

[0032] The regeneration liquid is introduced into the softening tank of the softening water treatment assembly, and sodium carbonate and sodium hydroxide are added to the softening tank to remove hardness and adjust the pH value of the liquid in the softening tank to 11.3-12.0. For example, 8% sodium carbonate and 32% sodium hydroxide can be added to the softening tank.

[0033] Further, a coagulant (such as poly-iron) is added in the coagulation tank to adsorb and precipitate the impurities such as suspended solids, colloids and organic matters in the liquid in the coagulation tank. A flocculant (such as polyacrylamide with a molecular weight of 16 million) is added in the flocculation tank to make the fine particles formed in the coagulation tank further form large particles to be removed, and then the effluent of the flocculation tank enters the sedimentation tank, which serves to further settle the large particles formed in the flocculation tank. The supernatant of the sedimentation tank enters the pH adjustment tank, which needs to add acid and alkali to neutralize the supernatant delivered from the sedimentation tank, so as to ensure that the pH value of the effluent of the pH adjustment tank is within the range of 6.0-9.0. For example, the residence time of the regenerated liquid in the softening tank of the softening water treatment assembly is not less than 20 min, the residence time in the coagulation tank is not less than 20 min, the residence time in the flocculation tank is not less than 20 min, the residence time in the sedimentation tank is not less than 150 min, and the residence time in the pH adjustment tank is not less than 20 min. In this embodiment, the hardness of the inlet water of the softening water treatment assembly is less than 3000 mg / L, the hardness of the outlet water is less than 150 mg / L, the residence time in the softening tank is set to 21.8 min, the residence time in the coagulation tank is set to 20.2 min, the residence time in the sedimentation tank is set to 2.8 h, and the residence time in the pH adjustment tank is set to 20.2 min.

[0034] In this embodiment, the water quality of the inlet of the softening water treatment assembly is: PH = 6-9, total hardness ≤ 3000 mg / L, suspended solids (SS) ≤ 200 mg / L; and the water quality of the outlet of the softening water treatment assembly is: PH = 6-9, total hardness ≤ 150 mg / L, suspended solids (SS) ≤ 10 mg / L.

[0035] Step S3: The effluent of the filtration assembly is delivered to the resin adsorption tower.

[0036] Therefore, by means of the resin regeneration waste liquid treatment system, the regenerated liquid generated in the resin regeneration process enters the regenerated liquid collection tank, and then enters the regenerated liquid neutralization tank for neutralization treatment. The neutralized liquid enters the softening water treatment assembly, sequentially passes through the softening tank, the coagulation tank, the flocculation tank, the sedimentation tank and the pH adjustment tank, and then enters the clean water tank after removal of suspended solids and total hardness and adjustment of pH. The liquid in the clean water tank is recycled and reused by entering the front-end effluent tank. The sludge generated in the softening water treatment assembly enters the sludge concentration tank for settlement, and then enters the dewatering unit to reduce the water content of the sludge to below 60%, and then is transported out for disposal.

[0037] As configured above, the utility model discloses through softening water treatment subassembly to resin regeneration liquid carries out softening treatment and adjusts pH value, thereby reducing the hardness of resin regeneration liquid, reduces the impact of resin regeneration liquid to the front end process, reduces the operation load of the front end process section, makes the effluent water quality of the front end process section (the front end process section in this embodiment is high density pool to effluent pool to filter assembly) stable and up to standard, avoids the frequent adsorption saturation of resin, and reduces the reagent dosing amount of the front end process section.

[0038] It should be noted that the reference to "one embodiment", "an embodiment", "the embodiment", "some embodiments" and the like in the specification indicates that the described embodiment can include a particular feature, structure, or characteristic, but not necessarily every embodiment. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other

[0039] It should be noted that the embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts of each embodiment can be referred to each other. For the system disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the relevant parts are described in the method part.

[0040] It should also be noted that although the utility model has been disclosed as above with the preferred embodiments, the above embodiments are not intended to limit the utility model. For any skilled person in the art, without departing from the scope of the utility model technical scheme, the above disclosed technical content can be used to make many possible changes and modifications to the utility model technical scheme, or modified as equivalent changes and equivalent embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model, which does not deviate from the content of the utility model technical scheme, still belongs to the protection scope of the utility model technical scheme.

[0041] It should also be understood that, unless specifically described or indicated, the terms "first", "second", "third" and the like in the specification are merely used to distinguish different components, elements, steps and the like in the specification, and are not intended to represent a logical relationship or sequence relationship between the components, elements, steps and the like.

[0042] It is also to be realized now that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It is also to be realized that the singular forms "a", "an", and "the" include plural referents unless the context clearly indicates otherwise. By way of example, a reference to "one step" or "one device" is a reference to one or more steps or one or more devices and can include sub-steps and sub-devices. All conjunctions used herein are to be understood in the broadest possible sense, such as meaning "and", "or", and "both". Also, the word "or" should be understood to have the definition as the logical "or" rather than the logic "exclusive or" unless the context clearly indicates otherwise. Furthermore, the method and / or device embodiments of the present application can be implemented by hardware, software, firmware, or a combination thereof.

Claims

1. A resin regeneration waste liquid treatment system, characterized in that, The application relates to a softening water treatment system. The coagulation and flocculation unit comprises a coagulation tank, a flocculation tank and a sedimentation tank connected in sequence through pipelines.

2. The resin regeneration spent liquor treatment system of claim 1, wherein The softening water treatment system comprises a sodium carbonate adding assembly and a sodium hydroxide adding assembly, the adding port of the sodium carbonate adding assembly is connected to the softening tank, and the adding port of the sodium hydroxide adding assembly is connected to the softening tank.

3. The resin regeneration spent liquor treatment system of claim 1, wherein The softening water treatment system comprises a pH adjusting tank, which is connected to the coagulation and flocculation unit and located in the downstream direction of the coagulation and flocculation unit.

4. The resin regeneration spent liquor treatment system of claim 1, wherein The resin regeneration waste liquid treatment system comprises a sludge treatment assembly, which comprises a sludge concentration tank and a dehydration unit connected through pipelines, the sludge concentration tank is connected to the softening water treatment system through a pipeline to collect and treat the sludge of the softening water treatment system.

5. The resin regeneration spent liquor treatment system of claim 1, wherein The resin regeneration waste liquid treatment system comprises a high-density tank, the water outlet end of the high-density tank is connected to the water tank through a pipeline, and the sludge outlet end of the high-density tank is connected to the sludge concentration tank through a pipeline.

6. The resin regeneration spent liquor treatment system of claim 5, wherein The resin regeneration waste liquid treatment system comprises a backwashing pipeline, the resin adsorption tank and the filter assembly are connected to the high-density tank through the backwashing pipeline to deliver backwashing water to the high-density tank for treatment.

7. The resin regeneration spent liquor treatment system of claim 6, wherein The filter assembly comprises a shallow sand filter, an ozone tower, an activated carbon filter and an ultrafiltration device connected in sequence through pipelines, and the ultrafiltration device is connected to the resin adsorption tank through a pipeline.

8. The resin regeneration spent liquor treatment system of claim 1, wherein The resin regeneration waste liquid treatment system comprises a regeneration liquid neutralization tank, which is connected to the resin adsorption tank through a pipeline, connected to the softening tank through a pipeline and located between the resin adsorption tank and the softening tank.

9. The resin regeneration spent liquor treatment system of claim 1, wherein The resin regeneration waste liquid treatment system comprises a regeneration liquid collection tank, which is connected to the outlet end of the resin adsorption tank and connected to the inlet end of the regeneration liquid neutralization tank.

10. The resin regeneration spent liquor treatment system of claim 9, wherein ​

Images