Slurry mixing wastewater pretreatment device

Abstract

The utility model discloses a slurry mixing wastewater pretreatment device which comprises a coagulative precipitation regulating tank, a heterogeneous catalytic oxidizer, a micro-electrolysis reducer and a homogeneous catalytic oxidizer are sequentially connected behind the coagulative precipitation regulating tank, and an outlet of the homogeneous catalytic oxidizer is connected to the heterogeneous catalytic oxidizer to form an oxidation-reduction circulation channel. According to the utility model, the coagulative precipitation regulating tank is combined with heterogeneous catalytic oxidation-microelectrolysis reduction-homogeneous catalytic oxidation to carry out structure integrated optimization, so that on one hand, the structure occupies a small area, and the construction cost is saved; on the other hand, the biodegradability of the high-concentration organic wastewater is improved, the high-concentration organic wastewater can be directly treated, and the problem that a large amount of domestic wastewater is introduced to improve the biodegradability, so that the occupied area is increased and the investment is increased is solved.

Description

Technical Field

[0001] The utility model relates to a pretreatment device for slurry mixing wastewater, belonging to the technical field of lithium battery production. Background Art

[0002] Due to the optimization of the battery production process, only the slurry mixing wastewater with a high organic matter concentration remains. Its main difficult-to-treat component is NMP, that is, N-methylpyrrolidone, also known as 1-methyl-2-pyrrolidone; N-methyl-2-pyrrolidone. It is a colorless and transparent oily liquid with a slight amine odor. It has a low volatility and extremely strong thermal and chemical stability, resulting in great difficulty in its treatment.

[0003] The existing treatments for lithium battery wastewater are all aimed at low-concentration organic wastewater. To treat high-concentration organic wastewater, a large amount of domestic wastewater needs to be introduced to dilute the high-concentration slurry mixing wastewater to improve its biodegradability, which will increase the amount of wastewater to be treated, thus increasing the floor area and the one-time investment cost. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a pretreatment device for slurry mixing wastewater. Through the structural design combining a coagulation sedimentation adjustment tank with heterogeneous catalytic oxidation - microelectrolysis reduction - homogeneous catalytic oxidation, the optimized integrated structure has a small floor area, solves the problems of large floor area and high cost in the prior art for treating high-concentration organic wastewater, improves the biodegradability of high-concentration organic wastewater, and is applicable to lithium battery slurry mixing wastewater.

[0005] To achieve the above purpose, the utility model is implemented by the following technical solution:

[0006] The utility model provides a pretreatment device for slurry mixing wastewater, including a coagulation sedimentation adjustment tank, which is sequentially connected to a heterogeneous catalytic oxidizer, a microelectrolysis reducer, and a homogeneous catalytic oxidizer. The outlet of the homogeneous catalytic oxidizer is connected to the heterogeneous catalytic oxidizer to form an oxidation-reduction circulation channel.

[0007] Further, the heterogeneous catalytic oxidizer is provided with heterogeneous catalytic oxidation packing, and the heterogeneous catalytic oxidation packing includes but is not limited to nickel-aluminum oxide catalyst or vanadium oxide-diatomaceous earth catalyst. The heterogeneous catalytic active component of the heterogeneous catalytic oxidation packing has a carrier, and the carrier is mainly used to support the active component, obtain a higher specific surface area, and has a suitable shape, size, and mechanical strength to meet the operation requirements of industrial reactors, so that the catalyst has specific physical properties, and the carrier itself generally also has catalytic activity. An oxidant, such as ozone, hydrogen peroxide, chlorine dioxide, etc., is also added into the heterogeneous catalytic oxidizer to accelerate the progress of the oxidation reaction.

[0008] Furthermore, polyferric fillers are provided inside the microelectrolytic reducer. The polyferric fillers include, but are not limited to, aluminum salts, iron salts, and their mixtures, which aggregate macromolecular organic substances or suspended particulate substances in the sewage into larger lumps, thereby separating them. A reducing agent is also added inside the microelectrolytic reducer to accelerate the reduction reaction.

[0009] Furthermore, a pH meter is provided inside the microelectrolytic reducer to monitor the pH during the reduction process in real time, prevent excessive acidity or alkalinity, and determine whether to add medicine based on the pH.

[0010] Furthermore, homogeneous catalytic oxidation fillers are provided inside the homogeneous catalytic oxidizer. The homogeneous catalytic oxidation fillers include, but are not limited to, solid acids, organic bases, metal oxides, and complexes, which carry out further catalytic oxidation reactions with the sewage. An oxidizing agent, such as ozone, hydrogen peroxide, chlorine dioxide, etc., is also added inside the homogeneous catalytic oxidizer to accelerate the oxidation reaction.

[0011] Furthermore, rotary blowers are connected to the bottoms of the heterogeneous catalytic oxidizer and the homogeneous catalytic oxidizer for aeration during the catalytic oxidation process.

[0012] Furthermore, the oxidation-reduction circulation channel of the present utility model serves as a safety device. Considering that if the foregoing oxidation-reduction fillers fail and result in poor treatment effects, the wastewater can be returned to the heterogeneous catalytic oxidizer for further treatment.

[0013] Furthermore, the coagulation sedimentation adjustment tank includes a coagulation tank, a sedimentation tank, and an adjustment tank connected in sequence, which preliminarily treats the wastewater through coagulation, sedimentation, and pH adjustment.

[0014] Furthermore, a stirring mechanism is provided inside the coagulation tank to scrape the wastewater sediment at the bottom of the tank to prevent scaling and damage to the device. The stirring mechanism includes a stirring shaft inserted into the coagulation tank, a stirrer connected to the stirring shaft, and a speed reducer fixedly connected to the top of the stirring shaft; a medicine feeding port is provided at the top of the coagulation tank for feeding coagulants and flocculants, such as PAC and PAM, etc.

[0015] Furthermore, sedimentation fillers are provided inside the sedimentation tank. The sedimentation fillers include, but are not limited to, honeycomb inclined tube fillers, which assist in sedimentation and prevent particle sedimentation from being disturbed by the water flow.

[0016] Furthermore, a pH meter and a medicine feeding port are provided at the top of the adjustment tank. The pH meter is used to monitor the pH of the wastewater in real time, and the medicine feeding port is used to feed pH regulators, such as hydrogen peroxide, etc. A stirring mechanism is also provided inside the adjustment tank to mix the water evenly through stirring to achieve homogeneous quantity.

[0017] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows:

[0018] For the slurry mixing wastewater pretreatment device of the present utility model, the coagulation sedimentation adjustment tank is integrated and optimized in structure by combining heterogeneous catalytic oxidation - micro - electrolysis reduction - homogeneous catalytic oxidation. On the one hand, the structure occupies a small area and saves construction costs; on the other hand, it improves the biodegradability of high - concentration organic wastewater, can directly treat high - concentration organic wastewater, and avoids the problems of increased land occupation and increased initial investment caused by introducing a large amount of domestic wastewater to improve biodegradability.

[0019] Through the structural design of heterogeneous catalytic oxidation - micro - electrolysis reduction - homogeneous catalytic oxidation of the present utility model, the COD concentration in high - concentration organic wastewater can be reduced by more than 60%, improving the biodegradability of the wastewater, and finally enabling the wastewater to meet the discharge standards directly and be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a slurry mixing wastewater pretreatment device provided by Embodiment 1 of the present utility model.

[0021] In the figure: 1, coagulation tank; 2, stirring shaft; 3, speed reducer; 4, chemical dosing port; 5, sedimentation tank; 6, sedimentation filler; 7, adjustment tank; 8, pH meter; 9, heterogeneous catalytic oxidizer; 10, heterogeneous catalytic oxidation filler; 11, rotary blower; 12, micro - electrolysis reducer; 13, polyferric filler; 14, homogeneous catalytic oxidizer; 15, homogeneous catalytic oxidation filler. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model and cannot be used to limit the protection scope of the present utility model.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and 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 understood as a limitation of the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0025] Embodiment 1

[0026] As Figure 1 shown, a device for pre-treating sizing wastewater includes a coagulation tank 1, a sedimentation tank 5, an adjustment tank 7, a heterogeneous catalytic oxidizer 9, a micro-electrolysis reducer 12, and a homogeneous catalytic oxidizer 14 that are connected in sequence. The outlet of the homogeneous catalytic oxidizer 14 is connected to the heterogeneous catalytic oxidizer 9 to form an oxidation-reduction circulation channel.

[0027] In this embodiment, a stirring mechanism is provided in the coagulation tank 1 to scrape the wastewater sediment at the bottom of the tank to prevent scaling and damage to the device. The stirring mechanism includes a stirring shaft 2 inserted into the coagulation tank 1, a stirrer connected to the stirring shaft 2, and a speed reducer 3 fixedly connected to the top of the stirring shaft 2. The stirrer is a paddle stirrer; a chemical dosing port 4 is provided at the top of the coagulation tank 1 for dosing coagulants and flocculants, such as PAC and PAM.

[0028] In this embodiment, sedimentation fillers 6 are provided in the sedimentation tank 5. The sedimentation fillers 6 are honeycomb inclined tube fillers, which are used to assist sedimentation so that the particle sedimentation is not interfered by the water flow.

[0029] In this embodiment, a pH meter 8 and a chemical dosing port 4 are provided at the top of the adjustment tank 7. The pH meter 8 is used to monitor the pH of the wastewater in real time, and the chemical dosing port 4 is used to dose pH regulators, such as hydrogen peroxide. A stirrer is also provided in the adjustment tank 7, and its structure is the same as that of the stirrer in the coagulation tank 1.

[0030] In this embodiment, the heterogeneous catalytic oxidizer 9 is provided with a nickel-aluminum oxide catalyst as the heterogeneous catalytic oxidation filler 10. An aluminum salt and iron salt mixture is provided in the micro-electrolysis reducer 12 as the polyferric filler 13, and a pH meter 8 is provided to monitor the pH during the reduction process in real time. A solid acid is provided in the homogeneous catalytic oxidizer 14 as the homogeneous catalytic oxidation filler 15. Rotary blowers 11 are connected to the bottoms of the heterogeneous catalytic oxidizer 9 and the homogeneous catalytic oxidizer 14 for aeration treatment during the catalytic oxidation process.

[0031] In the heterogeneous catalytic oxidizer 9, the micro-electrolytic reducer 12, and the homogeneous catalytic oxidizer 14, by using the surface contact between the sewage and the oxidation filler, strong oxidants (such as ozone, hydrogen peroxide, air, chlorine dioxide, etc.) can accelerate the oxidation of organic pollutants in the wastewater at normal temperature and pressure. During the catalytic process, a variety of highly oxidative active free radical groups (i.e., free radicals) will be newly generated, which can oxidize organic substances without selectivity in a wide range, oxidize macromolecular organic pollutants into small molecular organic pollutants, break the double bonds of organic substances, open the benzene ring, and the chromogenic groups will be detached. At the same time, the BOD / COD value is effectively increased. Under most conditions, the organic pollutants will be mineralized into carbon dioxide and water, and inorganic substances can also be oxidized or converted.

[0032] When the slurry mixing wastewater pretreatment device described in this embodiment is used to treat lithium battery slurry mixing wastewater, the slurry mixing wastewater is poured into the coagulation tank 1. The wastewater is stirred by the stirring shaft 2. Under the control of the speed reducer 3, the stirring shaft 2 makes the wastewater coagulate evenly, and then enters the sedimentation tank 5 for sedimentation. After that, the wastewater flows into the regulation tank 7 for homogenization, equalization, and pH adjustment. At the same time, hydrogen peroxide drugs are put into the drug dosing port 4. After adding the drugs, the wastewater flows through the heterogeneous catalytic oxidizer 9, and the rotary blower 11 is turned on for aeration treatment. After treatment, it enters the micro-electrolytic reducer 12, and the pH is detected at the same time. Finally, it undergoes secondary oxidation through the homogeneous catalytic oxidizer 14. If the filler fails during this process, the effluent can be returned to the heterogeneous catalytic oxidizer 9 for re-treatment. This process can greatly reduce the pollutant concentration of the wastewater, break the bonds, and improve the biodegradability of the subsequent process.

[0033] Example 2

[0034] As Figure 1 shown, a slurry mixing wastewater pretreatment device includes a coagulation tank 1, a sedimentation tank 5, a regulation tank 7, a heterogeneous catalytic oxidizer 9, a micro-electrolytic reducer 12, and a homogeneous catalytic oxidizer 14 connected in sequence. The outlet of the homogeneous catalytic oxidizer 14 is connected to the heterogeneous catalytic oxidizer 9 to form an oxidation-reduction circulation channel.

[0035] A stirring mechanism is provided in the coagulation tank 1 to scrape the wastewater sediment at the bottom of the tank to prevent scaling and damage to the device. The stirring mechanism includes a stirring shaft 2 inserted into the coagulation tank 1, a stirrer connected to the stirring shaft 2, and a speed reducer 3 fixedly connected to the top of the stirring shaft 2. The stirrer is a turbine stirrer; a drug dosing port 4 is provided at the top of the coagulation tank 1 for adding coagulants and flocculants, such as PAC and PAM, etc.

[0036] In this embodiment, sedimentation fillers 6 are provided in the sedimentation tank 5. The sedimentation fillers 6 are honeycomb inclined tube fillers, which are used to assist sedimentation so that the particle sedimentation is not interfered by the water flow.

[0037] In this embodiment, a pH meter 8 and a chemical dosing port 4 are provided at the top of the regulating tank 7. The pH meter 8 is used to monitor the pH of the wastewater in real time, and the chemical dosing port 4 is used to add pH regulators such as hydrogen peroxide.

[0038] In this embodiment, the heterogeneous catalytic oxidizer 9 is provided with a vanadium oxide - diatomite catalyst as the heterogeneous catalytic oxidation packing 10. In the micro - electrolytic reducer 12, an aluminum salt is provided as the poly - iron packing 13, and a pH meter 8 is provided to monitor the pH during the reduction process in real time. In the homogeneous catalytic oxidizer 14, a metal oxide is provided as the homogeneous catalytic oxidation packing 15. The bottoms of the heterogeneous catalytic oxidizer 9 and the homogeneous catalytic oxidizer 14 are both connected to a rotary blower 11 for aeration treatment during the catalytic oxidation process.

[0039] The usage process of the sizing wastewater pretreatment device in this embodiment is the same as that in Embodiment 1 and will not be elaborated here.

[0040] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the technical principle of the present utility model, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present utility model.

Claims

1. A pretreatment device for pulping wastewater, characterized in that: It comprises a coagulation and sedimentation regulating tank, wherein the coagulation and sedimentation regulating tank is sequentially connected to a heterogeneous catalytic oxidizer (9), a micro-electrolysis reducer (12) and a homogeneous catalytic oxidizer (14), and the outlet of the homogeneous catalytic oxidizer (14) is connected to the heterogeneous catalytic oxidizer (9), so as to form a redox circulation channel; The heterogeneous catalytic oxidizer (9) is provided with a heterogeneous catalytic oxidation filler (10); The homogeneous catalytic oxidizer (14) is provided with a homogeneous catalytic oxidation filler (15); The bottoms of the heterogeneous catalytic oxidizer (9) and the homogeneous catalytic oxidizer (14) are both connected to a rotary blower (11).

2. The pulping wastewater pretreatment device according to claim 1 is characterized in that: The heterogeneous catalytic oxidation filler (10) includes a nickel-alumina catalyst or a vanadium oxide-diatomaceous earth catalyst.

3. The pulping wastewater pretreatment device according to claim 1 is characterized in that: A poly-iron filler (13) is arranged in the micro-electrolysis reducer (12).

4. The pulping wastewater pretreatment device according to claim 1, characterized in that: A pH meter (8) is provided in the micro-electrolysis reducer (12).

5. The pulping wastewater pretreatment device according to claim 1, characterized in that: The coagulation and sedimentation regulating tank comprises a coagulation tank (1), a sedimentation tank (5) and a regulating tank (7) which are connected in sequence.

6. The pulping wastewater pretreatment device according to claim 5, characterized in that: The coagulation tank (1) is provided with a stirring mechanism inside and a drug adding port (4) at the top.

7. The pulping wastewater pretreatment device according to claim 5, characterized in that: A sedimentation filler (6) is provided in the sedimentation tank (5), and the sedimentation filler (6) comprises a honeycomb inclined tube filler.

8. The pulping wastewater pretreatment device according to claim 5, characterized in that: A pH meter (8) and a drug addition port (4) are provided on the top of the regulating tank (7).

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