Wastewater softening device

Abstract

The utility model relates to a wastewater softening device which comprises a primary softening reactor, a primary softening filter, a secondary softening reactor, a secondary softening filter, a water production tank, a secondary pressure dissolved air tank, a primary pressure dissolved air tank and a hardness monitor. Wastewater enters a primary softening reactor to react with carbon dioxide and then enters a primary softening filter, filtrate obtained after primary softening and filtering enters a secondary softening reactor, the hardness of primary softening inlet water is monitored through a first hardness monitor in the process, and the adding amount of carbon dioxide in the primary softening reactor is controlled; after the sewage enters a secondary softening reactor to react with carbon dioxide, the sewage enters a secondary softening filter, filtrate obtained after filtration enters a water production tank, the hardness of primary softened effluent is monitored through a second hardness monitor in the process, and the adding amount of carbon dioxide in the secondary softening reactor is controlled; carbon dioxide is introduced into the first-stage pressure dissolved air tank and the second-stage pressure dissolved air tank to be dissolved in produced water, and then is fed into the softening reactor, so that the utilization rate of the carbon dioxide is increased.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment, and particularly to a wastewater softening device. Background Art

[0002] There are many engineering cases of carbon dioxide softening and hardness removal technology in the non-ferrous metal smelting industry. Its advantages are economy and environmental protection, which are prominently manifested in less chemical consumption and sludge production. However, there are also some problems in its engineering application, mainly manifested in inaccurate control of the carbon dioxide dosage. In existing plants, the method of adding carbon dioxide by perforated aeration is mostly used. The bubbles generated by carbon dioxide in the wastewater are relatively large, resulting in limited contact area between carbon dioxide and the wastewater, insufficient reaction between carbon dioxide and calcium ions in the wastewater, and low carbon dioxide utilization efficiency. Summary of the Utility Model

[0003] In view of this, this application proposes a wastewater softening device that can reasonably allocate the amount of carbon dioxide entering the wastewater and improve the utilization efficiency of carbon dioxide.

[0004] According to a wastewater softening device provided by this application, it includes: a primary softening reactor, a primary softening filter, a secondary softening reactor, a secondary softening filter, a product water tank, a secondary pressure dissolved air tank, a primary pressure dissolved air tank, and a hardness monitor.

[0005] The first inlet of the primary softening reactor is suitable for introducing wastewater. There is a pipeline connection between the outlet end of the primary softening reactor and the first inlet of the primary softening filter. There is a pipeline connection between the outlet end of the primary softening filter and the first inlet of the secondary softening reactor. There is a pipeline connection between the outlet end of the secondary softening reactor and the inlet end of the secondary softening filter. There is a pipeline connection between the outlet end of the secondary softening filter and the inlet end of the product water tank. There is a pipeline connection between the outlet end of the product water tank and the liquid phase inlet of the secondary pressure dissolved air tank. There is a pipeline connection between the outlet end of the secondary pressure dissolved air tank and the second inlet of the secondary softening reactor. There is a pipeline connection between the outlet end of the product water tank and the liquid phase inlet of the primary pressure dissolved air tank. There is a pipeline connection between the outlet end of the primary pressure dissolved air tank and the second inlet of the primary softening reactor. There are multiple hardness monitors. A first hardness monitor is arranged on one side of the inlet end of the primary softening reactor. A second hardness monitor is arranged between the primary softening filter and the secondary softening reactor. The first hardness monitor is electrically connected to the primary pressure dissolved air tank. The second hardness monitor is electrically connected to the secondary pressure dissolved air tank.

[0006] In a possible implementation manner, a primary softening dissolved air release device is arranged in the primary softening reactor. The primary softening dissolved air release device is connected by a pipeline to the second inlet of the primary softening reactor, and is communicated with the primary pressure dissolved air tank; a secondary softening dissolved air release device is arranged in the secondary softening reactor. The secondary softening dissolved air release device is connected by a pipeline to the second inlet of the secondary softening reactor, and is communicated with the secondary pressure dissolved air tank.

[0007] In a possible implementation manner, the number of both the primary softening dissolved air release device and the secondary softening dissolved air release device is multiple; multiple primary softening dissolved air release devices are laid at a position near the bottom of the primary softening reactor, and multiple secondary softening dissolved air release devices are laid at a position near the bottom of the secondary softening reactor.

[0008] In a possible implementation manner, it further includes: a pH value regulator, the outlet end of the pH value regulator is connected by a pipeline to the first inlet of the primary softening filter, and the inlet end of the pH value regulator is suitable for introducing wastewater and a regulator.

[0009] In a possible implementation manner, it further includes: a pH value monitor, the number of the pH value monitors is multiple, a first pH value monitor is arranged on one side of the inlet end of the pH value regulator, a second pH value monitor is arranged between the pH value regulator and the primary softening reactor, a third pH value monitor is arranged between the primary softening filter and the secondary softening reactor, and a fourth pH value monitor is arranged between the secondary softening filter and the water production tank.

[0010] In a possible implementation manner, a primary intermediate water tank is arranged between the primary softening reactor and the primary softening filter, and the primary intermediate water tank and the primary softening filter are integrally formed; a secondary intermediate water tank is arranged between the secondary softening reactor and the secondary softening filter, and the secondary intermediate water tank and the secondary softening reactor are integrally formed.

[0011] In a possible implementation manner, a sludge drain pipe is connected to the bottoms of the primary softening filter and the secondary softening filter, and the sludge drain pipe is suitable for being connected outside the device.

[0012] In a possible implementation manner, a rotating part is arranged in both the primary softening filter and the secondary softening filter.

[0013] In a possible implementation manner, a first booster pump is provided for the pH value regulator and the primary softening reactor, a second booster pump is provided between the primary softening reactor and the primary softening filter, a third booster pump is provided between the secondary softening reactor and the secondary softening filter, and a dissolved air water pump is provided on one side of the water production tank near the outlet end.

[0014] In a possible implementation manner, a third hardness monitor is provided between the secondary softening filter and the water production tank.

[0015] Advantages of the present application: Wastewater enters the primary softening reactor and reacts with carbon dioxide in the primary softening reactor. The treated sewage then enters the primary softening filter, and the filtrate after primary softening filtration enters the secondary softening reactor. The first hardness monitor is arranged on one side of the inlet end of the primary softening reactor. During this process, the hardness of the influent water for primary softening is monitored by the first hardness monitor, and the dosage of carbon dioxide added to the primary softening reactor is controlled. After the sewage enters the secondary softening reactor and reacts with carbon dioxide, it enters the secondary softening filter, and the filtrate after filtration enters the water production tank. The second hardness monitor is arranged on one side of the inlet end of the secondary softening reactor. During this process, the hardness of the effluent water from primary softening is monitored by the second hardness monitor, and the dosage of carbon dioxide added to the secondary softening reactor is controlled. The qualified produced water entering the water production tank is partially fed into the first-stage pressure dissolved air tank and the second-stage pressure dissolved air tank, and carbon dioxide is introduced into the first-stage pressure dissolved air tank and the second-stage pressure dissolved air tank. After the carbon dioxide is dissolved in water, it is respectively fed into the primary softening reactor and the secondary softening reactor. According to a wastewater softening device of the present application, the amount of carbon dioxide entering the wastewater can be reasonably allocated, and the utilization rate of carbon dioxide can be improved.

[0016] According to the following detailed description of exemplary embodiments with reference to the accompanying drawings, other features and aspects of the present application will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings included in the specification and constituting a part of the specification, together with the specification, illustrate the exemplary embodiments, features, and aspects of the present application and are used to explain the principles of the present application.

[0018] Figure 1 A connection schematic diagram of the wastewater softening device showing an embodiment of the present application;

[0019] Figure 2 A working flowchart of the wastewater softening device showing an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. Identical reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0021] Among them, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present application.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0023] The term "exemplary" used herein means "serving as an example, embodiment, or illustration". Any embodiment described as "exemplary" herein need not be construed as superior to or better than other embodiments.

[0024] In addition, for a better description of the present application, numerous specific details are given in the following detailed implementation manners. Those skilled in the art should understand that the present application can also be implemented without some specific details. In some instances, methods, means, elements, and circuits well-known to those skilled in the art are not described in detail so as to highlight the gist of the present application.

[0025] As shown in the figure, the wastewater softening device includes: a primary softening reactor 3, a primary softening filter 4, a secondary softening reactor 7, a secondary softening filter 8, a product water tank 10, a secondary pressure air dissolving tank 9, a primary pressure air dissolving tank 5, and a hardness monitor.

[0026] The first inlet of the primary softening reactor 3 is adapted to introduce wastewater. There is a pipeline connection between the outlet end of the primary softening reactor 3 and the first inlet of the primary softening filter 4. There is a pipeline connection between the outlet end of the primary softening filter 4 and the first inlet of the secondary softening reactor 7. There is a pipeline connection between the outlet end of the secondary softening reactor 7 and the inlet end of the secondary softening filter 8. There is a pipeline connection between the outlet end of the secondary softening filter 8 and the inlet end of the product water tank 10. There is a pipeline connection between the outlet end of the product water tank 10 and the liquid phase inlet of the secondary pressure air dissolving tank 9. There is a pipeline connection between the outlet end of the secondary pressure air dissolving tank 9 and the second inlet of the secondary softening reactor 7. There is a pipeline connection between the outlet end of the product water tank 10 and the liquid phase inlet of the primary pressure air dissolving tank 5. There is a pipeline connection between the outlet end of the primary pressure air dissolving tank 5 and the second inlet of the primary softening reactor 3. There are multiple hardness monitors. A first hardness monitor ④ is arranged on one side of the inlet end of the primary softening reactor 3. A second hardness monitor ⑥ is arranged between the primary softening filter 4 and the secondary softening reactor 7. The first hardness monitor is electrically connected to the primary pressure air dissolving tank 5, and the second hardness monitor is electrically connected to the secondary pressure air dissolving tank 9.

[0027] The working steps of the device are as follows:

[0028] Step 1:

[0029] The copper smelting acidic wastewater (the wastewater is high-hardness wastewater without toxic and harmful gases, which can prevent the overflow of toxic and harmful gases after adding carbon dioxide) after sulfidation reaction, gypsum reaction and neutralization reaction first online monitors the state data of the wastewater according to the first pH value monitor ② and the flowmeter ①, and feeds back to calculate the dosage of NaOH. The wastewater enters the pH value regulator 1, and NaOH is added into it to adjust the pH value of the wastewater. After adjusting the pH value to a suitable value, it enters the primary softening reactor 3 through the first booster pump 11.

[0030] In this step, the system accurately controls the dosage of NaOH through the numerical feedback of the influent flowmeter ① and the first pH value monitor ②. At the same time, the outlet pH value of the pH value regulator 1 is monitored by the second pH value monitor ③, and the dosage of NaOH is adjusted according to its feedback value to accurately control the outlet pH value of the pH value regulator 1.

[0031] Step 2:

[0032] The sewage enters the primary softening reactor 3 through the first booster pump 11, and carbon dioxide is added in the primary softening reactor 3 through the primary air dissolving release device. The added carbon dioxide reacts with Ca in the primary softening reactor 3 2+The reaction wastewater enters the first-stage intermediate water tank 31. The wastewater in the first-stage intermediate water tank 31 is sent into the first-stage softening filter 4 by the second booster pump 12. The first-stage softening filter 4 adopts a continuous filtration method to prevent the fouling and blockage of the filter components in the first-stage softening filter 4. The filtrate after the first-stage softening filtration enters the second-stage softening reactor 7, and the filter residue is discharged to the sludge thickening tank outside the device through the bottom of the second-stage softening reactor 7.

[0033] During this process, the hardness of the influent water for the first-stage softening is monitored online by the first hardness monitor ④ to control the dosage of carbon dioxide added to the first-stage softening reactor 3, and the pH value of the effluent of the pH regulator 1 is adjusted by the second pH monitor ③. At the same time, since the carbon dioxide added to the first-stage softening reactor 3 will consume NaOH in the wastewater and reduce the pH value of the wastewater, to ensure that the pH value of the first-stage softening reactor 3 remains in a balanced state, the dosage of NaOH in the pH regulator 1 can be adjusted according to the feedback value of the third pH monitor ⑤ to accurately control the influent pH value of the first-stage softening reactor 3.

[0034] Step 3:

[0035] The pH value of the effluent filtered by the first-stage softening filter 4 will decrease due to the ongoing reaction. To ensure the influent pH value of the second-stage softening reactor 7, it is necessary to add NaOH to adjust the pH value of the wastewater before entering the second-stage softening reactor 7. The wastewater enters the second-stage softening reactor 7, and carbon dioxide is added through the second-stage dissolved air release device in the second-stage softening reactor 7. The added carbon dioxide reacts with Ca in the second-stage softening reactor 7 2+ The reaction wastewater enters the second-stage intermediate water tank 71, and PAM is added to the second-stage intermediate water tank 71. The wastewater in the second-stage intermediate water tank 71 is sent into the second-stage softening filter 8 by the third booster pump 13. The second-stage softening filter 8 adopts a continuous sludge discharge working method to prevent the internal structure of the second-stage softening filter 8 from fouling and blockage. The filtrate after the second-stage softening filtration enters the product water tank 10, and the filter residue is discharged to the sludge thickening tank outside the device through the outlet at the bottom of the second-stage softening filter 8.

[0036] In this process, the hardness of the effluent from the first-stage softening reaction is monitored online by the second hardness monitor ⑥, the amount of carbon dioxide added to the second-stage softening reactor 7 is controlled, and the pH value of the effluent from the first-stage softening filter 4 is monitored online by the third pH monitor ⑤. At the same time, the amount of carbon dioxide added to the second-stage softening reactor 7 is adjusted according to the value feedback online by the third hardness monitor ⑧, and the reaction degree in the second-stage softening reactor 7 is accurately controlled. Since the carbon dioxide added in the second-stage softening reaction will consume the NaOH added in the second-stage softening reactor 7 and reduce the pH value of the wastewater, in order to control the pH value in the second-stage softening reactor 7, the amount of NaOH added to the second-stage softening reactor 7 can be adjusted according to the fourth pH monitor ⑦ to accurately regulate the influent pH value in the second-stage softening reactor 7.

[0037] Step 4:

[0038] Before the carbon dioxide is added to the softening reactor, it first needs to be pumped into the first-stage pressure dissolving air tank 5 and the second-stage pressure dissolving air tank 9. At the same time, the qualified product water in the product water tank 10 is pumped into the first-stage pressure dissolving air tank 5 and the second-stage pressure dissolving air tank 9 through the dissolving air water pump 14. The addition of carbon dioxide adopts the method of steam-water pressurized mixing in the pressure dissolving air tank to increase the solubility of carbon dioxide in water. After the carbon dioxide dissolves in water in the pressure dissolving air tank, it is respectively added to the first-stage softening reactor 3 and the second-stage softening reactor 7 through the first-stage softening dissolved air release device 2 and the second-stage softening dissolved air release device 6.

[0039] In a possible implementation manner, a first-stage softening dissolved air release device 2 is arranged in the first-stage softening reactor 3. The first-stage softening dissolved air release device 2 is connected by a pipeline between the second inlet of the first-stage softening reactor 3, and is communicated between the first-stage softening dissolved air release device 2 and the first-stage pressure dissolving air tank 5; a second-stage softening dissolved air release device 6 is arranged in the second-stage softening reactor 7. The second-stage softening dissolved air release device 6 is connected by a pipeline between the second inlet of the second-stage softening reactor 7, and is communicated between the second-stage softening dissolved air release device 6 and the second-stage pressure dissolving air tank 9.

[0040] In a possible implementation manner, the number of the first-stage softening dissolved air release devices 2 and the second-stage softening dissolved air release devices 6 is multiple; a plurality of first-stage softening dissolved air release devices 2 are laid at a position close to the bottom of the first-stage softening reactor 3, and a plurality of second-stage softening dissolved air release devices 6 are laid at a position close to the bottom of the second-stage softening reactor 7. The first-stage softening dissolved air release device 2 and the second-stage softening dissolved air release device 6 rapidly release the carbon dioxide gas in the dissolved air water through the change of pressure, rise in the sewage in the form of tiny bubbles, increase the contact area between carbon dioxide and the sewage, and improve the utilization efficiency of carbon dioxide and the reaction efficiency.

[0041] In a possible implementation manner, it further includes: a pH regulator 1. The outlet end of the pH regulator 1 is connected by a pipeline to the first inlet of the primary softening filter 4. The inlet end of the pH regulator 1 is adapted to introduce wastewater and a regulator.

[0042] In a possible implementation manner, it further includes: a pH monitor. The number of pH monitors is multiple. A first pH monitor ② is arranged on one side of the inlet end of the pH regulator 1. A second pH monitor ③ is arranged between the pH regulator 1 and the primary softening reactor 3. A third pH monitor ⑤ is arranged between the primary softening filter 4 and the secondary softening reactor 7. A fourth pH monitor ⑦ is arranged between the secondary softening filter 8 and the water production tank 10. The multiple pH monitors and the multiple hardness monitors can feedback the wastewater state values online, accurately control the dosing amounts of carbon dioxide, NaOH, and PAM, thereby improving the utilization rate of the chemicals and accurately controlling the reaction degree.

[0043] In a possible implementation manner, a primary intermediate water tank 31 is arranged between the primary softening reactor 3 and the primary softening filter 4, and the primary intermediate water tank 31 and the primary softening filter 4 are integrally formed; a secondary intermediate water tank 71 is arranged between the secondary softening reactor 7 and the secondary softening filter 8, and the secondary intermediate water tank 71 and the secondary softening reactor 7 are integrally formed.

[0044] In a possible implementation manner, sludge drain pipes are connected to the bottoms of the primary softening filter 4 and the secondary softening filter 8, and the sludge drain pipes are adapted to be connected to the outside of the device.

[0045] In a possible implementation manner, rotating parts are arranged inside both the primary softening filter 4 and the secondary softening filter 8.

[0046] The overnight separation method of the primary softening filter 4 and the secondary softening filter 8 is pressure continuous filtration. During this process, sludge is continuously discharged to control the sludge concentration. At the same time, the internal filtration mechanism of the softening filter has the characteristic of being able to rotate, preventing the internal filtration components from scaling.

[0047] In a possible implementation manner, a first booster pump 11 is arranged between the pH regulator 1 and the primary softening reactor 3. A second booster pump 12 is arranged between the primary softening reactor 3 and the primary softening filter 4. A third booster pump 13 is arranged between the secondary softening reactor 7 and the secondary softening filter 8. A dissolved air water pump 14 is arranged on the side of the water production tank 10 close to the outlet end.

[0048] In a possible implementation manner, a third hardness monitor ⑧ is arranged between the secondary softening filter 8 and the water production tank 10.

[0049] In a possible implementation manner, a softening reactor, a softening filter, a pressure air dissolving tank, and a hardness monitor form a group, and multiple groups can be arranged in series through the above working mode to improve the overall softening effect of the device, and the water outlet effect is better and more stable.

[0050] It should be noted that although a wastewater softening device is introduced by taking this application as an example as above, those skilled in the art can understand that this application should not be limited thereto. In fact, users can flexibly set each parameter according to personal preferences and / or actual application scenarios as long as the design is reasonable.

[0051] In this way, the wastewater enters the primary softening reactor and reacts with carbon dioxide in the primary softening reactor. The treated sewage then enters the primary softening filter, and the filtrate after the primary softening filtration enters the secondary softening reactor. The first hardness monitor is arranged on one side of the inlet end of the primary softening reactor. During this process, the hardness of the influent water for the primary softening is monitored by the first hardness monitor, and the dosage of carbon dioxide in the primary softening reactor is controlled. After the sewage enters the secondary softening reactor and reacts with carbon dioxide, it enters the secondary softening filter, and the filtrate after filtration enters the water production tank. The second hardness monitor is arranged on one side of the inlet end of the secondary softening reactor. During this process, the hardness of the effluent water from the primary softening is monitored by the second hardness monitor, and the dosage of carbon dioxide in the secondary softening reactor is controlled. The qualified produced water that enters the water production tank partially enters the primary pressure air dissolving tank and the secondary pressure air dissolving tank, and carbon dioxide is introduced into the primary pressure air dissolving tank and the secondary pressure air dissolving tank. After the carbon dioxide is dissolved in water, it is respectively sent into the primary softening reactor and the secondary softening reactor. According to a wastewater softening device of the present application, the amount of carbon dioxide entering the wastewater can be reasonably allocated, and the utilization rate of carbon dioxide can be improved.

[0052] The above has described the embodiments of the present application. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the actual application, or the improvement of the technology in the market, or to enable other ordinary skill in the art in the technical field to understand the embodiments disclosed herein.

Claims

1. A wastewater softening device, characterized in that: include: Primary softening reactor, primary softening filter, secondary softening reactor, secondary softening filter, water production tank, secondary pressure dissolved air tank, primary pressure dissolved air tank and hardness monitor; The first inlet of the primary softening reactor is suitable for introducing wastewater, the outlet end of the primary softening reactor is connected to the first inlet of the primary softening filter by a pipeline, the outlet end of the primary softening filter is connected to the first inlet of the secondary softening reactor by a pipeline, the outlet end of the secondary softening reactor is connected to the inlet end of the secondary softening filter by a pipeline, the outlet end of the secondary softening filter is connected to the inlet end of the water production tank by a pipeline, the outlet end of the water production tank is connected to the liquid phase inlet of the secondary pressure dissolved gas tank by a pipeline, the outlet end of the secondary pressure dissolved gas tank is connected to the second inlet of the secondary softening reactor by a pipeline, the outlet end of the water production tank is connected to the liquid phase inlet of the primary pressure dissolved gas tank by a pipeline, and the outlet end of the primary pressure dissolved gas tank is connected to the second inlet of the primary softening reactor by a pipeline; There are multiple hardness monitors, a first hardness monitor is arranged on one side of the inlet end of the primary softening reactor, and a second hardness monitor is arranged between the primary softening filter and the secondary softening reactor; The first hardness monitor is electrically connected to the primary pressure dissolved air tank, and the second hardness monitor is electrically connected to the secondary pressure dissolved air tank.

2. The wastewater softening device according to claim 1, characterized in that: A first-stage softening dissolved gas releaser is arranged in the first-stage softening reactor, the first-stage softening dissolved gas releaser is connected to the second inlet of the first-stage softening reactor by a pipeline, and the first-stage softening dissolved gas releaser is connected to the first-stage pressure dissolved gas tank; A secondary softening dissolved gas releaser is arranged in the secondary softening reactor, the secondary softening dissolved gas releaser is connected to the second inlet of the secondary softening reactor by a pipeline, and the secondary softening dissolved gas releaser is connected to the secondary pressure dissolved gas tank.

3. The wastewater softening device according to claim 2, characterized in that: The number of the first-stage softening dissolved air releaser and the number of the second-stage softening dissolved air releaser are both multiple; A plurality of the first-stage softening dissolved gas releasers are laid near the bottom of the first-stage softening reactor, and a plurality of the second-stage softening dissolved gas releasers are laid near the bottom of the second-stage softening reactor.

4. The wastewater softening device according to any one of claims 1 to 3, characterized in that: Also includes: A pH value regulator, wherein the outlet end of the pH value regulator is connected to the first inlet of the primary softening filter through a pipeline, and the inlet end of the pH value regulator is suitable for introducing wastewater and a regulator.

5. The wastewater softening device according to claim 4, characterized in that: Also includes: pH value monitor, the number of the pH value monitors is multiple, a first pH value monitor is arranged on one side of the inlet end of the pH value regulator, a second pH value monitor is arranged between the pH value regulator and the primary softening reactor, a third pH value monitor is arranged between the primary softening filter and the secondary softening reactor, and a fourth pH value monitor is arranged between the secondary softening filter and the water production tank.

6. The wastewater softening device according to any one of claims 1 to 3, characterized in that: A primary intermediate water tank is provided between the primary softening reactor and the primary softening filter, and the primary intermediate water tank and the primary softening filter are integrally formed; A secondary intermediate water tank is arranged between the secondary softening reactor and the secondary softening filter, and the secondary intermediate water tank and the secondary softening reactor are integrally formed.

7. The wastewater softening device according to any one of claims 1 to 3, characterized in that: The bottoms of the primary softening filter and the secondary softening filter are connected with mud and sewage drainage pipes, and the mud and sewage drainage pipes are suitable for being connected to the outside of the device.

8. The wastewater softening device according to claim 7, characterized in that: The primary softening filter and the secondary softening filter are both provided with a rotating part.

9. The wastewater softening device according to claim 4, characterized in that: The pH regulator and the primary softening reactor are provided with a first boosting pump, a second boosting pump is provided between the primary softening reactor and the primary softening filter, a third boosting pump is provided between the secondary softening reactor and the secondary softening filter, and a dissolved air water pump is provided on one side of the water production tank close to the outlet end.

10. The wastewater softening device according to any one of claims 1 to 3, characterized in that: A third hardness monitor is provided between the secondary softening filter and the water production tank.

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