Nickel-containing wastewater treatment equipment and system

Abstract

The utility model provides nickel-containing wastewater treatment equipment and a nickel-containing wastewater treatment system. The nickel-containing wastewater treatment equipment comprises a primary sedimentation tank, a primary flocculation device, an ozone tower, a secondary flocculation device and a secondary sedimentation tank. And the primary flocculation device is communicated with a water inlet of the primary sedimentation tank. And the ozone tower is communicated with the water outlet of the primary sedimentation tank. And the secondary flocculation device is communicated with the ozone tower. And a water inlet of the secondary sedimentation tank is communicated with the secondary flocculation device. According to the nickel-containing wastewater treatment equipment, for nickel-containing wastewater with complex water quality, the treatment cost can be well reduced, the treatment burden of a biochemical system is relieved, and the oxidation decomplexing stability of nickel ions is ensured.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a treatment device and system for nickel-containing wastewater. Background Technology

[0002] Heavy metal oxidation is a crucial step in wastewater treatment, primarily used to break down complexed heavy metal ions, converting them into free heavy metal ions. These free ions are then removed as sludge through reaction and precipitation, thus reducing the load on subsequent biological treatment systems. In particular, nickel ions in industrial park surface wastewater are strongly complexed, making treatment extremely difficult. Conventionally, a combination of Fenton oxidation and heavy metal adsorption is used to remove nickel ions from industrial park surface wastewater. While this process can reduce nickel ion concentrations to below 0.1 mg / L, it suffers from poor stability and high cost. (Example: Application No. CN201811220932) The invention patent application No. 1 uses ozone oxidation to oxidize and break down the complexes of heavy metal nickel ions in wastewater. Specifically, it involves: introducing an ozone oxidation system - flocculation and sedimentation - adding a heavy metal precipitant - secondary flocculation and sedimentation. Although this method can effectively improve the treatment stability of heavy metal nickel ions in wastewater and achieve the discharge standards (total nickel < 0.1 mg / L, total phosphorus < 0.5 mg / L) in Table 3 of the "Electroplating Pollutant Discharge Standard" (GB21900-2008) after secondary flocculation, the ozone oxidation of wastewater is affected by suspended impurities in the water. For wastewater with complex water quality, directly introducing it into the ozone oxidation system can easily affect the oxidation and complex-breaking efficiency of heavy metal nickel ions in the wastewater, thus affecting the nickel ion oxidation and complex-breaking effect. In addition, the added heavy metal precipitant still results in a high cost for wastewater treatment and can affect the treatment effect of the subsequent biological treatment system. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a treatment device and system for nickel-containing wastewater with complex water quality, which can effectively reduce treatment costs, alleviate the treatment burden of the biochemical system, and ensure the stability of nickel ion oxidation and complex breaking.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A device for treating nickel-containing wastewater, comprising:

[0006] Primary sedimentation tank;

[0007] A primary flocculation device, which is connected to the inlet of the primary sedimentation tank;

[0008] An ozone tower, wherein the ozone tower is connected to the outlet of the primary sedimentation tank;

[0009] a secondary flocculation device, which is in communication with the ozone tower;

[0010] a secondary sedimentation tank, which has a water inlet in communication with the secondary flocculation device.

[0011] In one of the embodiments, the treatment device for the nickel-containing wastewater further comprises a primary buffer tank, which is in communication with the water outlet of the primary sedimentation tank and in communication with the ozone tower.

[0012] In one of the embodiments, the primary sedimentation tank is a radial flow sedimentation tank.

[0013] In one of the embodiments, the secondary sedimentation tank is a radial flow sedimentation tank.

[0014] In one of the embodiments, the primary flocculation device comprises a first PH adjusting tank, a first PAC coagulation tank and a first PAM flocculation tank in sequence, and the first PAM flocculation tank is in communication with the water inlet of the primary sedimentation tank.

[0015] In one of the embodiments, the treatment device for the nickel-containing wastewater further comprises a nickel-containing wastewater collection tank and a first mixing pipe;

[0016] The first PAC coagulation tank comprises a PAC configuration part, a PAC mixing part and a PAC coagulation part in sequence, the PAC mixing part, the nickel-containing wastewater collection tank and the first PH adjusting tank are all in communication with one end of the first mixing pipe, the PAC coagulation part is in communication with the other end of the first mixing pipe, and the PAC coagulation part is in communication with the first PAM flocculation tank.

[0017] In one of the embodiments, the treatment device for the nickel-containing wastewater further comprises a second mixing pipe;

[0018] The first PAM flocculation tank comprises a PAM configuration part, a PAM mixing part and a PAM flocculation part in sequence, the first PAC coagulation tank and the PAM mixing part are both in communication with one end of the second mixing pipe, the PAM flocculation part is in communication with the other end of the second mixing pipe, and the PAM flocculation part is in communication with the water inlet of the primary sedimentation tank.

[0019] In one of the embodiments, the ozone tower is an ozone tower with an ozone dosage ≥280 mg / L.

[0020] In one of the embodiments, the ozone tower is an ozone tower with a water residence time ≥0.9 h.

[0021] In one embodiment, the secondary flocculation device includes a second pH adjustment tank, a second PAC coagulation tank, and a second PAM flocculation tank connected in sequence, with the second PAM flocculation tank connected to the inlet of the secondary sedimentation tank.

[0022] In one embodiment, the nickel-containing wastewater treatment equipment further includes a secondary buffer tank, which is connected to the outlet of the secondary sedimentation tank.

[0023] A nickel-containing wastewater treatment system includes a conveying mechanism and the nickel-containing wastewater treatment equipment described in any of the above embodiments. The conveying mechanism is disposed between any two of the primary sedimentation tank, primary flocculation device, ozone tower, secondary flocculation device, and secondary sedimentation tank that are adjacent to each other.

[0024] Compared with the prior art, the present invention has at least the following advantages:

[0025] This invention relates to a nickel-containing wastewater treatment device that allows nickel-containing wastewater to undergo flocculation and sedimentation in a primary sedimentation tank and a primary flocculation device before entering the ozone tower. This reduces suspended impurities in the wastewater and effectively mitigates the impact of oxidation and complex breaking within the ozone tower. It is particularly effective for complex nickel-containing wastewater, significantly improving the stability of nickel ion oxidation and complex breaking. Furthermore, the stable and thorough oxidation and complex breaking of the wastewater using the ozone tower facilitates sufficient flocculation and sedimentation of nickel ions in the subsequent secondary flocculation device and sedimentation tank. This method is less costly than using heavy precipitants, effectively reducing the cost of nickel-containing wastewater treatment and lessening the burden on the biological treatment system. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a nickel-containing wastewater treatment device according to one embodiment of the present invention;

[0028] Figure 2 for Figure 1 Another structural schematic diagram of the nickel-containing wastewater treatment equipment shown;

[0029] Figure 3 for Figure 1 A partial view of the equipment used to treat nickel-containing wastewater. Detailed Implementation

[0030] For the purpose of facilitating the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present application can be more thoroughly and completely understood.

[0031] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustrative purposes only and are not intended to be limiting.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] The application provides a kind of nickel-containing wastewater treatment equipment. The nickel-containing wastewater treatment equipment described above includes primary sedimentation tank, primary flocculation device, ozone tower, secondary flocculation device and secondary sedimentation tank. Primary flocculation device is communicated with the water inlet of primary sedimentation tank. Ozone tower is communicated with the water outlet of primary sedimentation tank. Secondary flocculation device is communicated with ozone tower. The water inlet of secondary sedimentation tank is communicated with secondary flocculation device.

[0034] The nickel-containing wastewater treatment equipment described above makes that nickel-containing wastewater is flocculated and precipitated by primary sedimentation tank and primary flocculation device respectively before entering ozone tower, to further reduce suspended impurities in nickel-containing wastewater, to further reduce the influence of oxidation and breakage of nickel-containing wastewater in ozone tower, especially for the nickel-containing wastewater with complex water quality, to better improve the oxidation and breakage stability of nickel ions in nickel-containing wastewater. In addition, the ozone tower is used to stably and sufficiently oxidize and break the nickel-containing wastewater, to facilitate subsequent flocculation and precipitation by secondary flocculation device and secondary sedimentation tank to complete the sufficient flocculation and precipitation of nickel ions in nickel-containing wastewater. Compared with the cost of using heavy trapping agent, the treatment cost of nickel-containing wastewater is reduced, and the biochemical system treatment burden is reduced.

[0035] In order to better understand the nickel-containing wastewater treatment equipment of the present application, the nickel-containing wastewater treatment equipment of the present application will be further explained as follows:

[0036] Please refer to Figures 1 to 3 The treatment device 10 for nickel-containing wastewater in an embodiment includes a first sedimentation tank 100, a first flocculation device 200, an ozone tower 300, a second flocculation device 400, and a second sedimentation tank 500. The first flocculation device 200 is in communication with the water inlet of the first sedimentation tank 100. The ozone tower 300 is in communication with the water outlet of the first sedimentation tank 100. The second flocculation device 400 is in communication with the ozone tower 300. The water inlet of the second sedimentation tank 500 is in communication with the second flocculation device 400.

[0037] The treatment device 10 for nickel-containing wastewater described above allows the nickel-containing wastewater to be flocculated and precipitated by the first sedimentation tank 100 and the first flocculation device 200 before entering the ozone tower 300, thereby reducing the suspended impurities in the nickel-containing wastewater, and thereby better reducing the impact of oxidative breakage of the nickel-containing wastewater in the ozone tower 300, especially for nickel-containing wastewater with complex water quality, better improving the oxidative breakage stability of the nickel ions in the nickel-containing wastewater. In addition, the ozone tower 300 is used to stably and sufficiently oxidize and break the nickel-containing wastewater, so that the subsequent flocculation and precipitation by the second flocculation device 400 and the second sedimentation tank 500 can complete the sufficient flocculation and precipitation of the nickel ions in the nickel-containing wastewater, which is lower in cost than using a heavy capture agent, better reduces the treatment cost of the nickel-containing wastewater, and better reduces the treatment burden of the biochemical system.

[0038] Please refer to Figures 1 to 3 In one of the embodiments, the treatment device 10 for nickel-containing wastewater further includes a first buffer tank 600, which is in communication with the water outlet of the first sedimentation tank 100 and in communication with the ozone tower 300, which is conducive to the uninterrupted and stable operation of the treatment device 10 for nickel-containing wastewater. It can be understood that the first buffer tank is a conventional buffer tank structure in sewage treatment, and the present application does not protect the structure of the first buffer tank, but only protects the positional relationship and connection relationship of the first buffer tank.

[0039] In one of the embodiments, the first sedimentation tank is a radial flow sedimentation tank, which better ensures the sufficient flocculation and precipitation of the suspended impurities in the nickel-containing wastewater. Further, the second sedimentation tank is a radial flow sedimentation tank, which better ensures the sufficient flocculation and precipitation of the nickel ions in the nickel-containing wastewater. It can be understood that the first sedimentation tank and the second sedimentation tank are conventional radial flow sedimentation tank structures in sewage treatment, and the present application does not protect the structure of the first sedimentation tank and the second sedimentation tank, but only protects the positional relationship and connection relationship of the first sedimentation tank and the second sedimentation tank.

[0040] Please refer to Figures 1 to 3In one embodiment, the primary flocculation device 200 comprises a first PH adjusting tank 210, a first PAC coagulation tank 220 and a first PAM flocculation tank 230 connected in sequence, and the first PAM flocculation tank 230 is connected with the water inlet of the primary sedimentation tank 100, which preferably ensures the uninterrupted and stable operation of the nickel-containing wastewater treatment device 10. Further, the first PH adjusting tank 210 comprises a PH configuration tank 211 and a PH mixing tank 212 connected in sequence, and the PH mixing tank 212 is connected with the first PAC coagulation tank 220. It can be understood that the PH configuration tank and the PH mixing tank are the pool structures for containing PH reagents in conventional sewage treatment, and the structure of the PH configuration tank and the PH mixing tank is not protected in the present application, only the positional relationship and connection relationship of the PH configuration tank and the PH mixing tank are protected.

[0041] Please refer to Figures 1 to 3 In one embodiment, the nickel-containing wastewater treatment device 10 further comprises a nickel-containing wastewater collection tank 800 and a first mixing pipe 900. Further, the first PAC coagulation tank 220 comprises a PAC configuration part 221, a PAC mixing part 222 and a PAC coagulation part 223 connected in sequence, the PAC mixing part 222, the nickel-containing wastewater collection tank 800 and the first PH adjusting tank 210 are all connected with one end of the first mixing pipe 900, the PAC coagulation part 223 is connected with the other end of the first mixing pipe 900, and the PAC coagulation part 223 is connected with the first PAM flocculation tank 230, which further preferably ensures the uninterrupted and stable operation of the nickel-containing wastewater treatment device 10. It can be understood that the nickel wastewater collection tank is a collection tank for collecting nickel-containing wastewater in conventional sewage treatment, and the structure of the nickel wastewater collection tank is not protected in the present application, only the positional relationship and connection relationship of the nickel wastewater collection tank are protected; the first mixing pipe is a pipe structure for conveying nickel-containing wastewater in conventional sewage treatment, and the material of the first mixing pipe is not protected in the present application, only the structural relationship, positional relationship and connection relationship of the first mixing pipe are protected; the PAC configuration part, the PAC mixing part and the PAC coagulation part are pool structures for sewage flocculation in conventional sewage treatment, and the structure of the PAC configuration part, the PAC mixing part and the PAC coagulation part is not protected in the present application, only the positional relationship and connection relationship of the PAC configuration part, the PAC mixing part and the PAC coagulation part are protected.

[0042] Please refer to Figures 1 to 3In one of the embodiments, the treatment device 10 for the nickel-containing wastewater further comprises a second mixing pipeline 1000. Further, the first PAM flocculation tank 230 comprises a PAM arrangement part 231, a PAM mixing part 232 and a PAM flocculation part 233 which are sequentially communicated, the first PAC coagulation tank 220 and the PAM mixing part 232 are both communicated with one end of the second mixing pipeline 1000, the PAM flocculation part 233 is communicated with the other end of the second mixing pipeline 1000, and the PAM flocculation part 233 is communicated with the water inlet of the primary sedimentation tank 100, which further preferably ensures the uninterrupted and stable operation of the treatment device 10 for the nickel-containing wastewater. It can be understood that the second mixing pipeline is a pipeline structure commonly used for conveying the nickel-containing wastewater in sewage treatment, and the material of the second mixing pipeline is not protected in the present application, but only the structural relationship, positional relationship and connection relationship of the second mixing pipeline are protected; the PAM arrangement part, the PAM mixing part and the PAM flocculation part are tank structures commonly used for sewage flocculation in sewage treatment, and the structure of the PAM arrangement part, the PAM mixing part and the PAM flocculation part is not protected in the present application, but only the positional relationship and connection relationship of the PAM arrangement part, the PAM mixing part and the PAM flocculation part are protected.

[0043] In one of the embodiments, the ozone tower is an ozone tower with an ozone dosage of the water inlet ≥280 mg / L. Further, the ozone tower is an ozone tower with a water residence time ≥0.9 h, which preferably ensures the sufficient oxidation and complex breaking of the nickel ions in the nickel-containing wastewater, so that the subsequent secondary flocculation device and secondary sedimentation tank can preferably achieve the sufficient flocculation and sedimentation of the nickel ions in the nickel-containing wastewater. It can be understood that the ozone tower is an ozone tower commonly used for the oxidation and complex breaking of the nickel ions in sewage treatment, and the structure of the ozone tower is not protected in the present application, but only the positional relationship and connection relationship of the ozone tower are protected.

[0044] Please refer to Figures 1 to 3 In one of the embodiments, the secondary flocculation device 400 comprises a second PH adjusting tank 410, a second PAC coagulation tank 420 and a second PAM flocculation tank 430 which are sequentially communicated, the second PAM flocculation tank 430 is communicated with the water inlet of the secondary sedimentation tank 500, which preferably ensures the uninterrupted and stable operation of the treatment device 10 for the nickel-containing wastewater. It can be understood that the second PH adjusting tank has the same structure as the first PH adjusting tank, the second PAC coagulation tank has the same structure as the first PAC coagulation tank, and the second PAM flocculation tank has the same structure as the first PAM flocculation tank, and the above description of the first PH adjusting tank, the first PAC coagulation tank and the first PAM flocculation tank can be referred to for details, which will not be described herein.

[0045] Please refer to Figures 1 to 3In one of the embodiments, the nickel-containing wastewater treatment device 10 further comprises a secondary buffer tank 700, which is in communication with the outlet of the secondary sedimentation tank 500, and is conducive to the uninterrupted and stable operation of the nickel-containing wastewater treatment device 10.

[0046] The application further provides a nickel-containing wastewater treatment system. Figures 1 to 3 In the embodiment, the nickel-containing wastewater treatment device 10 comprises a primary sedimentation tank 100, a primary flocculation device 200, an ozone tower 300, a secondary flocculation device 400 and a secondary sedimentation tank 500.

[0047] The nickel-containing wastewater treatment system has the nickel-containing wastewater treatment device, and thus the oxidation and breakage stability of the nickel ions in the nickel-containing wastewater is improved, the treatment cost of the nickel-containing wastewater is reduced, the treatment burden of the biochemical system is reduced, and the stable operation of the nickel-containing wastewater treatment system is improved.

[0048] Compared with the prior art, the nickel-containing wastewater treatment device has at least the following advantages:

[0049] The nickel-containing wastewater treatment device 10 can make the nickel-containing wastewater flocculate and deposit in the primary sedimentation tank 100 and the primary flocculation device 200 before entering the ozone tower 300, so that the suspended impurities in the nickel-containing wastewater are reduced, the influence of the oxidation and breakage of the nickel-containing wastewater in the ozone tower 300 is reduced, the oxidation and breakage stability of the nickel ions in the nickel-containing wastewater is improved, especially for the nickel-containing wastewater with complex water quality, the nickel ions in the nickel-containing wastewater can be fully flocculated and deposited by the secondary flocculation device 400 and the secondary sedimentation tank 500 after the nickel-containing wastewater is stably and fully oxidized and broken in the ozone tower 300, the cost of using a heavy capture agent is reduced, the treatment cost of the nickel-containing wastewater is reduced, and the treatment burden of the biochemical system is reduced.

[0050] The above embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A treatment apparatus for nickel-containing wastewater, characterized by comprising: The treatment equipment for the nickel-containing wastewater comprises: a primary sedimentation tank; a primary flocculation device, which is in communication with a water inlet of the primary sedimentation tank, wherein the primary flocculation device comprises a first PH adjusting tank, a first PAC coagulation tank and a first PAM flocculation tank which are sequentially communicated, and the first PAM flocculation tank is in communication with the water inlet of the primary sedimentation tank; an ozone tower, which is in communication with a water outlet of the primary sedimentation tank; a secondary flocculation device, which is in communication with the ozone tower; a secondary sedimentation tank, a water inlet of which is in communication with the secondary flocculation device; wherein the treatment equipment for the nickel-containing wastewater further comprises a nickel-containing wastewater collecting tank and a first mixed-flow pipeline; the first PAC coagulation tank comprises a PAC configuration part, a PAC mixed-flow part and a PAC coagulation part which are sequentially communicated, the PAC mixed-flow part, the nickel-containing wastewater collecting tank and the first PH adjusting tank are all in communication with one end of the first mixed-flow pipeline, the PAC coagulation part is in communication with the other end of the first mixed-flow pipeline, and the PAC coagulation part is in communication with the first PAM flocculation tank.

2. The treatment apparatus for nickel-containing wastewater according to claim 1, characterized by, The treatment equipment for the nickel-containing wastewater further comprises a primary buffer tank, which is in communication with a water outlet of the primary sedimentation tank and in communication with the ozone tower.

3. The treatment apparatus for nickel-containing wastewater according to claim 1, characterized by The primary sedimentation tank is a radial flow sedimentation tank; and / or, The secondary sedimentation tank is a radial flow sedimentation tank.

4. The treatment apparatus for nickel-containing wastewater according to claim 1, characterized by The treatment equipment for the nickel-containing wastewater further comprises a second mixed-flow pipeline; the first PAM flocculation tank comprises a PAM configuration part, a PAM mixed-flow part and a PAM flocculation part which are sequentially communicated, the first PAC coagulation tank and the PAM mixed-flow part are both in communication with one end of the second mixed-flow pipeline, the PAM flocculation part is in communication with the other end of the second mixed-flow pipeline, and the PAM flocculation part is in communication with the water inlet of the primary sedimentation tank.

5. The treatment apparatus for nickel-containing wastewater according to claim 1, characterized by The ozone tower is an ozone tower with an ozone dosage ≥280 mg / L; and / or, The ozone tower is an ozone tower with a water residence time ≥0.9 h.

6. The treatment apparatus for nickel-containing wastewater according to claim 1, characterized by The secondary flocculation device comprises a second PH adjusting tank, a second PAC coagulation tank and a second PAM flocculation tank which are sequentially communicated, and the second PAM flocculation tank is in communication with a water inlet of the secondary sedimentation tank.

7. The treatment apparatus for nickel-containing wastewater according to claim 1, characterized by The treatment equipment for the nickel-containing wastewater further comprises a secondary buffer tank, which is in communication with a water outlet of the secondary sedimentation tank.

8. A system for treating nickel-containing wastewater, characterized by, The treatment equipment for the nickel-containing wastewater comprises: a conveying mechanism and the treatment equipment for the nickel-containing wastewater according to any one of claims 1 to 7, which is arranged between any two of the primary sedimentation tank, the primary flocculation device, the ozone tower, the secondary flocculation device and the secondary sedimentation tank which are arranged adjacently.

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