Treatment device and treatment method for water-based paint production wastewater

Abstract

The application discloses a kind of water-based paint production wastewater treatment device and processing method.It relates to wastewater treatment technical field.The wastewater treatment device includes first coagulation sedimentation tank, pH adjusting tank, iron-carbon micro-electrolysis reaction module, fenton reaction module and second coagulation sedimentation tank connected in sequence.The iron-carbon micro-electrolysis reaction module includes first iron-carbon micro-electrolysis cell and second iron-carbon micro-electrolysis cell connected in series.The fenton reaction module includes first module and second module connected in parallel.The first module includes first fenton reactor and third fenton reactor connected in series.The pollutants in wastewater can be fully broken after passing through iron-carbon micro-electrolysis reaction module and fenton reaction module, and the water-borne refractory organic matter is fully removed, and the single COD removal rate can reach more than 70%.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, in particular to a water-based paint production wastewater treatment device and method. BACKGROUND

[0002] Paints are mainly divided into two categories: oil-based paint and water-based paint. Among them, water-based paint includes three types: water-soluble, water-diluted, and water-dispersed (emulsion paint). In the production process of water-based paint, a certain amount of paint-containing wastewater will inevitably be generated. These wastewaters contain organic matter, and the traditional physical and chemical methods cannot achieve the ring-opening and chain-breaking of organic matter, so it is necessary to use combined advanced oxidation methods to treat the above-mentioned paint-containing wastewater.

[0003] The iron-carbon micro-electrolysis and photo-Fenton advanced oxidation method combined treatment method is a commonly used method for treating paint-containing wastewater, but this method has the following shortcomings: 1. The optimal residence time of the electrolysis theory of the iron-carbon micro-electrolysis method is 0.5-2h, but this residence time is not enough for the wastewater to be completely treated, and it will further affect the treatment effect of the photo-Fenton advanced oxidation method; 2. The filler used in the iron-carbon micro-electrolysis method needs to be further improved, the existing filler is easy to be cemented, and the particle size of the existing filler is too large, which affects the wastewater treatment effect; 3. In the existing photo-Fenton advanced oxidation method, the pH of the reaction zone is too high, which requires additional addition of iron catalyst, and the too high pH will affect the combination with the iron-carbon micro-electrolysis method; 4. In the existing photo-Fenton advanced oxidation method, the ultraviolet light irradiation time is not sufficient; 5. The wastewater treatment effect of the existing iron-carbon micro-electrolysis and photo-Fenton advanced oxidation method combined treatment method is poor, in general, the COD removal rate of wastewater by the iron-carbon micro-electrolysis method alone is 20-40%, the COD removal rate of wastewater by the photo-Fenton method alone is about 40%, and the COD removal rate of wastewater by the existing iron-carbon micro-electrolysis and photo-Fenton advanced oxidation method combined treatment method is only about 50-60%, which has limited improvement.

[0004] Therefore, there is an urgent need for a new water-based paint production wastewater treatment device and method to solve the above problems. SUMMARY

[0005] The first technical problem to be solved by the present application is:

[0006] To provide a water-based paint production wastewater treatment device.

[0007] The second technical problem to be solved by the present application is:

[0008] To provide a method for treating water-based paint production wastewater using the device.

[0009] The present application also provides a water-based paint production wastewater treatment device for use in the production of automotive water-based paint.

[0010] To solve the first technical problem, the present application adopts the technical solution of:

[0011] A wastewater treatment device comprises a first coagulation sedimentation tank, a pH adjusting tank, an iron-carbon micro-electrolysis reaction module, a Fenton reaction module and a second coagulation sedimentation tank connected in sequence.

[0012] The iron-carbon micro-electrolysis reaction module comprises a first iron-carbon micro-electrolysis cell and a second iron-carbon micro-electrolysis cell connected in series.

[0013] The Fenton reaction module comprises a first module and a second module connected in parallel.

[0014] The first module comprises a first Fenton reactor and a third Fenton reactor connected in series.

[0015] The second module comprises a second Fenton reactor and a fourth Fenton reactor connected in series.

[0016] A reflux module is arranged in the Fenton reaction module to allow the wastewater to be treated in the Fenton reaction module for multiple times.

[0017] According to the embodiment of the present application, one of the technical solutions has at least one of the following advantages or beneficial effects:

[0018] 1. The double-cell series connection of the iron-carbon micro-electrolysis cell can maximize the effect of removing the target pollutants by iron-carbon micro-electrolysis, achieving the effect of 1+1>2.

[0019] 2. The reflux module in the photo-Fenton reaction module greatly increases the reaction residence time, and under the action of photolysis, Fe 3+ is reduced to Fe 2+ , which participates in the Fenton reaction again, increases the catalysis of the Fenton reagent, and at the same time, part of the reagent is refluxed to the front end of the iron-carbon micro-electrolysis, which enhances the removal of pollutants, and further, the entire system can not need to add additional Fe 2+ catalyst, reducing the cost of reagent use.

[0020] 3. The pollutants in the wastewater can be fully broken after passing through the iron-carbon micro-electrolysis reaction module and the Fenton reaction module, and the refractory organic matter in the water can be fully removed, and the single COD removal rate can reach more than 70%.

[0021] According to an embodiment of the present application, the pH values of the wastewater in the iron-carbon micro-electrolysis reaction module and the Fenton reaction module are kept consistent to promote the combination of the two.

[0022] According to an embodiment of the present application, the pH of the wastewater in the iron-carbon micro-electrolysis reaction module and the Fenton reaction module is 2.5-3.5, specifically, the pH in the prior art is generally higher, i.e. 4-5, and the present application optimizes the pH.

[0023] According to an embodiment of the present application, the pH of the wastewater in the iron-carbon micro-electrolysis reaction module and the Fenton reaction module is selected from any one of the following pH values or a range formed by any two of the following pH values: 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4 and 3.5.

[0024] According to an embodiment of the present application, the wastewater treatment device is provided with a water collecting pool connected to one end of the first coagulation sedimentation pool and a filter connected to one end of the second coagulation sedimentation pool.

[0025] According to an embodiment of the present application, the filter can be further provided with a separation member. The separation member can be a filter screen or other filtering elements.

[0026] According to an embodiment of the present application, the first iron-carbon micro-electrolysis pool and the second iron-carbon micro-electrolysis pool are both provided with a support, and the support is arranged at a distance of 20-30 cm from the bottom of the pool, so as to fully consider the installation interval and maintenance of the aeration device.

[0027] According to an embodiment of the present application, the distance between the support and the bottom of the pool is selected from any one of the following distances or a range formed by any two of the following distances: 20 cm, 21 cm, 22 cm, 23 cm, 24 cm, 25 cm, 26 cm, 27 cm, 28 cm, 29 cm and 30 cm.

[0028] According to an embodiment of the present application, the material of the support includes polypropylene. The support is used to support the screen and the filler.

[0029] According to an embodiment of the present application, the support is filled with iron-carbon filler, the particle size of the iron-carbon filler is 12-18 mm, and the volume ratio of the iron-carbon filler in the first iron-carbon micro-electrolysis pool or the second iron-carbon micro-electrolysis pool is 50-55%.

[0030] According to an embodiment of the present application, the particle size of the iron-carbon filler is selected from any one of the following particle sizes or a range formed by any two of the following particle sizes: 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm and 18 mm.

[0031] According to an embodiment of the present application, the volume ratio of the iron-carbon filler in the first iron-carbon micro-electrolysis cell or the second iron-carbon micro-electrolysis cell is selected from any one of the following volume ratios or an interval formed by any two of the following volume ratios: 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, and 60%.

[0032] The particle size of the iron-carbon filler is 12-18 mm, which can balance the relationship between the maximum specific surface area of the filler and the anti-caking property of the filler, avoid the caking of the iron-carbon filler caused by the too large specific surface area of the filler, and avoid the poor treatment effect of the wastewater caused by the too small specific surface area of the iron-carbon filler.

[0033] According to an embodiment of the present application, the iron-carbon filler is the iron-carbon micro-electrolysis filler of Sunyi Environmental Protection.

[0034] According to an embodiment of the present application, a plurality of screens are arranged in the support to separate the iron-carbon fillers in different areas. The different screens are independent individuals for reaction.

[0035] According to an embodiment of the present application, the screen is used to avoid the large-area caking of the iron-carbon filler. Specifically, the screen is a modular product, and the specific number of screens can be set according to the water quantity.

[0036] According to an embodiment of the present application, the screen has an area of 50-60 cm*50-60 cm.

[0037] Preferably, the screen has an area of 50 cm*50 cm.

[0038] According to an embodiment of the present application, a plurality of porous aeration pipes with a diameter of 50-70 cm are uniformly arranged in the screen in the vertical direction to perform aeration and oxygen supply. The porous aeration pipes also have a certain stirring effect to prevent the caking of the filler.

[0039] According to an embodiment of the present application, the diameter of the porous aeration pipe is selected from any one of the following diameters or an interval formed by any two of the following diameters: 50 cm, 51 cm, 52 cm, 53 cm, 54 cm, 55 cm, 56 cm, 57 cm, 58 cm, 59 cm, 60 cm, 61 cm, 62 cm, 63 cm, 64 cm, 65 cm, 66 cm, 67 cm, 68 cm, 69 cm, and 70 cm.

[0040] According to an embodiment of the present application, as a kind of preferred, the diameter of the porous aeration pipe is selected from 50 cm.

[0041] According to an embodiment of the present application, the first Fenton reactor, the third Fenton reactor, the second Fenton reactor and the fourth Fenton reactor are all cylindrical structures, the center of the cylindrical structure is provided with an ultraviolet lamp tube, and the material of the inner wall of the cylindrical structure is a light-reflecting material. The cylindrical structure can maximize the avoidance of fluid dead zones, so that the reaction solution is uniformly mixed, and the contact area with ultraviolet light is increased. The material of the inner wall of the cylindrical structure is a light-reflecting material, which can maximize the moderate illumination of the Fenton reaction solution.

[0042] According to an embodiment of the present application, an interface is provided in the cylindrical structure, which can be used for adding reagents.

[0043] According to an embodiment of the present application, the added reagents can include only one reagent or two or more reagents without a sequence, in which case one interface can be provided for adding reagents.

[0044] According to an embodiment of the present application, the added reagents are multiple reagents that need to be added in sequence, in which case multiple interfaces that are sequentially connected can be provided.

[0045] According to an embodiment of the present application, hydrogen peroxide can also be added to the Fenton reactor.

[0046] According to an embodiment of the present application, in the wastewater treatment device, the iron-carbon micro-electrolysis reaction module and the Fenton reaction module can be placed in parallel. They can also be placed non-parallelly, that is, the horizontal positions of the communication parts of the iron-carbon micro-electrolysis reaction module and the Fenton reaction module are different. For example, in some embodiments, one of the communication parts of the adjacent iron-carbon micro-electrolysis reaction module and the Fenton reaction module is located at the top of the other, and the other of the communication parts of the adjacent iron-carbon micro-electrolysis reaction module and the Fenton reaction module is located at the bottom. Such a setting can make the wastewater raw solution have a flow-blocking effect between the two modules when moving from one module to another, so that the mixing of the wastewater raw solution with the reagents is more uniform during the movement.

[0047] To solve the second technical problem, the technical solution adopted by the present application is:

[0048] A method for treating water-based paint production wastewater by using the wastewater treatment device, comprising the following steps:

[0049] S1 After the wastewater is collected, it flows into the first coagulation and sedimentation tank, and reagents for wastewater treatment are added to remove suspended substances in the wastewater;

[0050] S2 The wastewater treated in S1 enters the pH adjusting tank, the iron-carbon micro-electrolysis reaction module and the Fenton reaction module in sequence, wherein the Fenton reaction module is provided with a reflux module to allow the wastewater to be treated in the Fenton reaction module multiple times.

[0051] The wastewater treated by S2 enters a second coagulation sedimentation tank, and treated wastewater is obtained.

[0052] According to an embodiment of the present application, the wastewater in step S1 is water-based paint production wastewater, and the water quality of the wastewater is CODcr≤5000mg / L, SS≤800mg / L, and B / C ratio (BOD5 / CODcr) <0.2, and the wastewater has poor biodegradability.

[0053] According to an embodiment of the present application, the wastewater treatment agent comprises the following components: polyaluminum chloride and polyacrylamide, and the weight ratio of polyaluminum chloride to polyacrylamide is 50-60:3-10.

[0054] According to an embodiment of the present application, the weight ratio of polyaluminum chloride to polyacrylamide includes but is not limited to 50:3, 50:4, 50:5, 50:6, 50:7, 50:8, 50:9 and 50:10.

[0055] According to an embodiment of the present application, the pH in the pH adjusting tank is maintained at 2.5-3.5.

[0056] According to an embodiment of the present application, the pH in the pH adjusting tank is selected from any one of the following pH values or a range formed by any two of the following pH values: 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4 and 3.5.

[0057] According to an embodiment of the present application, the empty bed residence time of each iron-carbon micro-electrolysis tank in the iron-carbon micro-electrolysis reaction module is 2h-3h.

[0058] The empty bed residence time is the residence time of water in the tank without fillers.

[0059] According to an embodiment of the present application, in step S2, the reflux ratio of the reflux module is 90-100%.

[0060] According to an embodiment of the present application, in step S2, a reflux heating device can also be added to the reflux module as needed, and the reflux heating device can heat the wastewater. When the heat source of the reflux heating device is water vapor, the reflux heating device obtains liquid water in the heat exchange process.

[0061] According to an embodiment of the present application, the reflux heating device can be a heater. The reflux heating device generally has a feeding end, a discharging end, an air inlet end, an air outlet end and a water outlet end. Generally, the air inlet end of the reflux heating device is used to introduce high-temperature steam. The high-temperature steam can be fresh high-temperature water vapor or water vapor discharged from a previous evaporation module.

[0062] According to an embodiment of the present application, in step S3, after the wastewater enters the second coagulation sedimentation tank, the pH is adjusted to 2.5-3.5, and a precipitant is added.

[0063] According to an embodiment of the present application, the pH in the second coagulation sedimentation tank is selected from any one of the following pH values or a range formed by any two of the following pH values: 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4 and 3.5.

[0064] According to an embodiment of the present application, in step S3, an alkali is further added to the second coagulation sedimentation tank.

[0065] Another aspect of the present application also relates to the use of the wastewater treatment device in the production of water-based paint for automobiles. The wastewater treatment device comprises the embodiments of the first aspect described above. Since the use of the wastewater treatment device adopts all the technical solutions of the above-mentioned wastewater treatment device, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments.

[0066] Other features and advantages of the present application will be set forth in the description that follows, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0067] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:

[0068] Figure 1 The flow chart of the method for treating wastewater from water-based paint production in Example 1 using the wastewater treatment device of Example 1.

[0069] Figure 2 The schematic diagram of the iron-carbon micro-electrolysis reaction module of the wastewater treatment device in Example 1.

[0070] Figure 3 The schematic diagram of the Fenton reaction module of the wastewater treatment device in Example 1.

[0071] REFERENCE NUMERALS:

[0072] 100 - water collecting tank, 200 - first coagulation sedimentation tank, 300 - pH adjusting tank, 400 - iron-carbon micro-electrolysis reaction module, 410 - iron-carbon filler, 420 - porous aeration pipe, 430 - bracket, 440 - screen, 450 - first iron-carbon micro-electrolysis tank, 460 - second iron-carbon micro-electrolysis tank, 500 - Fenton reaction module, 510 - ultraviolet lamp, 520 - first Fenton reactor, 530 - third Fenton reactor, 540 - second Fenton reactor, 550 - fourth Fenton reactor, 600 - second coagulation sedimentation tank, 700 - filter. DETAILED DESCRIPTION

[0073] Embodiments of the present application are described in detail below with reference to the attached drawings. The embodiments described below are examples of the present application and are not intended to limit the present application.

[0074] In the description of the present application, if there is a description to first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0075] In the description of the present application, it is to be understood that the orientation description, such as up, down, etc., is based on the orientation or position relationship shown in the embodiments, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0076] The words "preferably", "more preferably" and the like in the present application mean that the embodiments of the present application can provide certain beneficial effects in certain cases. However, other embodiments can also be preferred in the same or other cases. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not usable, nor is it intended to exclude other embodiments from the scope of the present application.

[0077] When a numerical range is disclosed herein, the above range is considered to be continuous and includes the minimum value and the maximum value of the range, as well as every value between the minimum value and the maximum value. Further, when the range refers to an integer, every integer between the minimum value and the maximum value of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all sub-ranges subsumed therein.

[0078] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0079] Iron-carbon micro-electrolysis: a good process for treating wastewater by forming a primary cell according to the principle of metal corrosion, also known as internal electrolysis method, iron filings filtration method, etc. Micro-electrolysis technology is an ideal process for treating high-concentration organic wastewater. It is to generate a potential difference of 1.2V in wastewater by using micro-electrolysis materials filled in the wastewater without electricity, so as to achieve the purpose of degrading organic pollutants.

[0080] Photo-Fenton advanced oxidation process: the conventional Fenton method mainly relies on the oxidation of the hydroxyl radical (·OH) generated in the Fenton reaction to break the chain; in addition to the generation of hydroxyl radical (·OH), the photo-catalytic Fenton (UV-Fenton) also allows the C-C and C-N bonds in organic compounds to absorb ultraviolet light energy and break, so that the organic matter is gradually degraded, and finally leaves in the form of CO2, that is, the combined action of light and hydroxyl radical (·OH).

[0081] The reagents, methods and equipment used in the present application are conventional reagents, methods and equipment in the technical field unless otherwise specified.

[0082] Example 1

[0083] A water-based paint production wastewater treatment device, comprising a water collecting pool 100, a first coagulation sedimentation pool 200, a pH adjusting pool 300, an iron-carbon micro-electrolysis reaction module 400, a Fenton reaction module 500, a second coagulation sedimentation pool 600 and a filter connected in sequence. Figure 2 The iron-carbon micro-electrolysis reaction module 400 of the device in Example 1 is shown in the schematic diagram.

[0084] The iron-carbon micro-electrolysis reaction module 400 includes a first iron-carbon micro-electrolysis cell 450 and a second iron-carbon micro-electrolysis cell 460 connected in series. The first iron-carbon micro-electrolysis cell 450 and the second iron-carbon micro-electrolysis cell 460 are both provided with a support 430, which is arranged at a distance of 20 cm from the bottom of the pool. The support 430 is filled with iron-carbon filler 410. The particle size of the iron-carbon filler 410 is 12 mm. The volume fraction of the iron-carbon filler 410 in the first iron-carbon micro-electrolysis cell 450 or the second iron-carbon micro-electrolysis cell 460 is about 50%. A plurality of screens 440 are arranged in the support 430 to separate the iron-carbon fillers 410 in different regions. A plurality of porous aeration pipes 420 with a diameter of 50 cm are uniformly arranged in the screens 440 in the vertical direction.

[0085] The Fenton reaction module 500 comprises a first module and a second module connected in parallel with each other;

[0086] The first module comprises a first Fenton reactor 520 and a third Fenton reactor 530 connected in series with each other;

[0087] The second module comprises a second Fenton reactor 540 and a fourth Fenton reactor 550 connected in series with each other;

[0088] The Fenton reaction module 500 is provided with a reflux module so that the wastewater is treated multiple times in the Fenton reaction module 500;

[0089] The first Fenton reactor 520, the third Fenton reactor 530, the second Fenton reactor 540 and the fourth Fenton reactor 550 are all cylindrical structures, the center of the cylindrical structure is provided with an ultraviolet lamp 510 tube, and the material of the inner wall of the cylindrical structure is a reflective material.

[0090] A method for treating water-based paint production wastewater by using the device, as shown in Figure 1 The method comprises the following steps:

[0091] S1 After the wastewater is collected in the water collecting pool 100, it flows into the first coagulation sedimentation pool 200, and wastewater treatment agents are added to remove suspended substances in the wastewater;

[0092] S2 The wastewater enters the pH adjusting pool 300, the iron-carbon micro-electrolysis reaction module 400 and the Fenton reaction module 500 in sequence, wherein the pH in the pH adjusting pool 300 is maintained at 2.5, and the Fenton reaction module 500 is provided with a reflux module so that the wastewater is treated multiple times in the Fenton reaction module 500;

[0093] S3 The wastewater enters the second coagulation sedimentation pool 600, the pH is adjusted to 2.5, and alkali and a precipitating agent are added, and after treatment, qualified effluent is obtained;

[0094] The empty bed residence time of each iron-carbon micro-electrolysis cell in the iron-carbon micro-electrolysis reaction module 400 is 2h.

[0095] The iron-carbon micro-electrolysis reaction module 400 is as shown in Figure 2As shown in the first iron-carbon micro electrolytic cell 450, the support 430 supports the screen 440 and the iron-carbon filler 410, the wastewater enters the first iron-carbon micro electrolytic cell 450 from the water inlet direction, and then enters the treatment area surrounded by the screen 440, in which the wastewater is adsorbed and treated by the iron-carbon filler 410, and is aerated by the porous aeration pipe 420 in the screen 440, and then the wastewater enters the next treatment area surrounded by the screen 440, and is treated for multiple times, and then the wastewater enters the second iron-carbon micro electrolytic cell 460 in series along the water flow direction, is treated, and then flows out along the water outlet direction to enter the next treatment link.

[0096] The Fenton reaction module 500 of the wastewater treatment device in Example 1 is shown in the schematic diagram as Figure 3 As shown.

[0097] Specifically, the wastewater in step S1 is water-based paint production wastewater, the water quality of which is CODcr≤5000mg / L, SS≤800mg / L, and the B / C ratio (BOD5 / CODcr) is less than 0.2, and the biodegradability is poor.

[0098] The above-mentioned wastewater treatment agent comprises the following components: polyaluminum chloride and polyacrylamide, wherein the weight ratio of polyaluminum chloride to polyacrylamide is 50:3.

[0099] According to an embodiment of the present application, in step S2, the reflux ratio of the reflux module is 100%.

[0100] According to an embodiment of the present application, in step S3, after the wastewater enters the second coagulation sedimentation tank 460, the pH is adjusted to 2.5, and a precipitant is added.

[0101] Example 2

[0102] A water-based paint production wastewater treatment device comprises a water collecting tank 100, a first coagulation sedimentation tank 200, a pH adjusting tank 300, an iron-carbon micro electrolysis reaction module 400, a Fenton reaction module 500, a second coagulation sedimentation tank 600 and a filter 700 connected in sequence.

[0103] The iron-carbon micro-electrolysis reaction module 400 comprises a first iron-carbon micro-electrolysis cell 450 and a second iron-carbon micro-electrolysis cell 460 connected in series, and the first iron-carbon micro-electrolysis cell 450 and the second iron-carbon micro-electrolysis cell 460 are both provided with a support 430 arranged at a distance of 30 cm from the bottom of the cell, and the support 430 is filled with iron-carbon filler 410, the particle size of the iron-carbon filler 410 is 18 mm, the volume ratio of the iron-carbon filler 410 in the first iron-carbon micro-electrolysis cell 450 or the second iron-carbon micro-electrolysis cell 460 is about 50%, and a plurality of screens 440 are arranged in the support 430 to separate the iron-carbon fillers 410 in different regions, and the screens 440 are uniformly provided with a plurality of porous aeration pipes 420 with a diameter of 70 cm in the vertical direction;

[0104] The Fenton reaction module 500 comprises a first module and a second module connected in parallel;

[0105] The first module comprises a first Fenton reactor 520 and a third Fenton reactor 530 connected in series;

[0106] The second module comprises a second Fenton reactor 540 and a fourth Fenton reactor 550 connected in series;

[0107] The Fenton reaction module 500 is provided with a reflux module to allow the wastewater to be treated in the Fenton reaction module 500 multiple times;

[0108] The first Fenton reactor 520, the third Fenton reactor 530, the second Fenton reactor 540 and the fourth Fenton reactor 550 are all cylindrical structures, and the center of the cylindrical structure is provided with an ultraviolet lamp 510 tube, and the material of the inner wall of the cylindrical structure is a light-reflecting material.

[0109] A method for treating water-based paint production wastewater by using the device comprises the following steps:

[0110] S1 After the wastewater is collected in the water collecting tank 100, it flows into the first coagulation sedimentation tank 200, and wastewater treatment agents are added to remove suspended substances in the wastewater;

[0111] S2 The wastewater enters the pH adjusting tank 300, the iron-carbon micro-electrolysis reaction module 400 and the Fenton reaction module 500 in sequence, wherein the pH in the pH adjusting tank 300 is maintained at 3.5, and the Fenton reaction module 500 is provided with a reflux module to allow the wastewater to be treated in the Fenton reaction module 500 multiple times;

[0112] S3 The wastewater enters the second coagulation sedimentation tank 600, the pH is adjusted to 3.5, and alkali and a precipitating agent are added, and after treatment, qualified effluent is obtained;

[0113] The empty bed residence time of each iron-carbon micro-electrolysis cell in the iron-carbon micro-electrolysis reaction module 400 is 2h.

[0114] Specifically, the wastewater in step S1 is water-based paint production wastewater, the water quality of which is CODcr≤5000mg / L, SS≤800mg / L, and the B / C ratio (BOD5 / CODcr) is less than 0.2, and the biodegradability is poor.

[0115] The wastewater treatment agent comprises the following components: polyaluminum chloride and polyacrylamide, wherein the weight ratio of polyaluminum chloride to polyacrylamide is 50-60:3-10.

[0116] According to an embodiment of the present application, in step S2, the reflux ratio of the reflux module is 100%.

[0117] According to an embodiment of the present application, in step S3, after the wastewater enters the second coagulation sedimentation tank 600, the pH is adjusted to 3.5, and a precipitant is added.

[0118] Example 3

[0119] A water-based paint production wastewater treatment device comprises a water collecting tank 100, a first coagulation sedimentation tank 200, a pH adjusting tank 300, an iron-carbon micro-electrolysis reaction module 400, a Fenton reaction module 500, a second coagulation sedimentation tank 600 and a filter 700 connected in sequence.

[0120] The iron-carbon micro-electrolysis reaction module 400 comprises a first iron-carbon micro-electrolysis cell 450 and a second iron-carbon micro-electrolysis cell 460 connected in series, and a support 430 is arranged in each of the first iron-carbon micro-electrolysis cell 450 and the second iron-carbon micro-electrolysis cell 460, the support 430 is arranged at a distance of 25cm from the bottom of the tank, the support 430 is filled with iron-carbon filler 410, the particle size of the iron-carbon filler 410 is 16mm, the volume ratio of the iron-carbon filler 410 in the first iron-carbon micro-electrolysis cell 450 or the second iron-carbon micro-electrolysis cell 460 is about 50%, and a plurality of screens 440 are arranged in the support 430 to separate the iron-carbon fillers 410 in different regions, and a plurality of porous aeration pipes 420 with a diameter of 60cm are uniformly arranged in the screens 440 in the vertical direction.

[0121] The Fenton reaction module 500 comprises a first module and a second module connected in parallel.

[0122] The first module comprises a first Fenton reactor 520 and a third Fenton reactor 530 connected in series.

[0123] The second module comprises a second Fenton reactor 540 and a fourth Fenton reactor 550 connected in series.

[0124] The Fenton reaction module 500 is provided with a reflux module, so that the wastewater is treated in the Fenton reaction module 500 for multiple times.

[0125] The first Fenton reactor 520, the third Fenton reactor 530, the second Fenton reactor 540 and the fourth Fenton reactor 550 are all cylindrical structures, the center of the cylindrical structure is provided with a UV lamp 510 tube, and the material of the inner wall of the cylindrical structure is a reflective material.

[0126] A method for treating water-based paint production wastewater by using the device comprises the following steps:

[0127] S1 The wastewater is collected in the water collecting tank 100 and then flows into the first coagulation sedimentation tank 200, and wastewater treatment agents are added to remove suspended substances in the wastewater.

[0128] S2 The wastewater enters the pH adjusting tank 300, the iron-carbon micro-electrolysis reaction module 400 and the Fenton reaction module 500 in sequence, wherein the pH in the pH adjusting tank 300 is maintained at 3.0, and the Fenton reaction module 500 is provided with a reflux module, so that the wastewater is treated in the Fenton reaction module 500 for multiple times.

[0129] S3 The wastewater enters the second coagulation sedimentation tank 600, the pH is adjusted to 3.0, and alkali and a precipitating agent are added, and after treatment, qualified effluent is obtained.

[0130] The empty bed residence time of each iron-carbon micro-electrolysis cell in the iron-carbon micro-electrolysis reaction module 400 is 2h.

[0131] Specifically, the wastewater in step S1 is water-based paint production wastewater, the water quality of which is CODcr≤5000mg / L, SS≤800mg / L, and the B / C ratio (BOD5 / CODcr) is less than 0.2, and the biodegradability is poor.

[0132] The wastewater treatment agent comprises the following components: polyaluminum chloride and polyacrylamide, wherein the weight ratio of polyaluminum chloride to polyacrylamide is 50:3.

[0133] According to an embodiment of the present application, in step S2, the reflux ratio of the reflux module is 100%.

[0134] According to an embodiment of the present application, in step S3, after the wastewater enters the second coagulation sedimentation tank 600, the pH is adjusted to 3.0, and a precipitating agent is added.

[0135] Example 4

[0136] The application discloses a water-based paint production wastewater treatment device, which comprises, in sequence, a water collecting pool 100, a first coagulation sedimentation pool 200, a pH adjusting pool 300, an iron-carbon micro-electrolysis reaction module 400, a Fenton reaction module 500, a second coagulation sedimentation pool 600 and a filter 700.

[0137] The iron-carbon micro-electrolysis reaction module 400 comprises a first iron-carbon micro-electrolysis pool 450 and a second iron-carbon micro-electrolysis pool 460 which are connected in series, the first iron-carbon micro-electrolysis pool 450 and the second iron-carbon micro-electrolysis pool 460 are both provided with a support 430 which is arranged at a distance of 20 cm from the bottom of the pool, the support 430 is filled with iron-carbon filler 410, the particle size of the iron-carbon filler 410 is 12 mm, the volume ratio of the iron-carbon filler 410 in the first iron-carbon micro-electrolysis pool 450 or the second iron-carbon micro-electrolysis pool 460 is about 50%, and a plurality of screens 440 are arranged in the support 430 so as to separate the iron-carbon fillers 410 in different regions, and the screens 440 are uniformly provided with a plurality of porous aeration pipes 420 with a diameter of 50 cm in the vertical direction.

[0138] The Fenton reaction module 500 comprises a first module and a second module which are connected in parallel.

[0139] The first module comprises a first Fenton reactor 520 and a third Fenton reactor 530 which are connected in series.

[0140] The second module comprises a second Fenton reactor 540 and a fourth Fenton reactor 550 which are connected in series.

[0141] The Fenton reaction module 500 is provided with a reflux module so that the wastewater is treated in the Fenton reaction module 500 for multiple times.

[0142] The first Fenton reactor 520, the third Fenton reactor 530, the second Fenton reactor 540 and the fourth Fenton reactor 550 all have a cylindrical structure, the center of the cylindrical structure is provided with an ultraviolet lamp 510 tube, and the material of the inner wall of the cylindrical structure is a light-reflecting material.

[0143] A method for treating water-based paint production wastewater by using the device comprises the following steps.

[0144] S1 After the wastewater is collected in the water collecting pool 100, the wastewater flows into the first coagulation sedimentation pool 200, and wastewater treatment agents are added to remove suspended substances in the wastewater.

[0145] S2 The wastewater enters the pH adjusting pool 300, the iron-carbon micro-electrolysis reaction module 400 and the Fenton reaction module 500 in sequence, the pH in the pH adjusting pool 300 is maintained at 2.5, and the Fenton reaction module 500 is provided with a reflux module so that the wastewater is treated in the Fenton reaction module 500 for multiple times.

[0146] The S3 wastewater enters the second coagulation sedimentation tank 600, the pH is adjusted to 2.5, and an alkali and a precipitant are added, and after treatment, qualified effluent is obtained.

[0147] The empty bed residence time of each iron-carbon micro-electrolysis cell in the iron-carbon micro-electrolysis reaction module 400 is 2h.

[0148] Specifically, the wastewater in step S1 is water-based paint production wastewater, the water quality of which is CODcr≤5000mg / L, SS≤800mg / L, and the B / C ratio (BOD5 / CODcr) is <0.2, and the biodegradability is poor.

[0149] The wastewater treatment agent comprises the following components: polyaluminum chloride and polyacrylamide, wherein the weight ratio of polyaluminum chloride to polyacrylamide is 60:5.

[0150] According to an embodiment of the present application, in step S2, the reflux ratio of the reflux module is 100%.

[0151] According to an embodiment of the present application, in step S3, after the wastewater enters the second coagulation sedimentation tank 600, the pH is adjusted to 2.5, and a precipitant is added.

[0152] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent transformation or direct or indirect application in the related technical field using the content of the present application is also included in the patent protection scope of the present application.

Claims

1. A wastewater treatment device for water-based paint production, characterized in that: It includes a first coagulation sedimentation tank (200), a pH adjustment tank (300), an iron-carbon micro-electrolysis reaction module (400), a Fenton reaction module (500), and a second coagulation sedimentation tank (600) connected in sequence. The iron-carbon micro-electrolysis reaction module (400) includes a first iron-carbon micro-electrolysis cell (450) and a second iron-carbon micro-electrolysis cell (460) connected in series. Each of the first and second iron-carbon micro-electrolysis cells (450 and 460) is equipped with a support (430), which is positioned 20-30 cm from the bottom of the cell. The support (430) is filled with iron-carbon filler (410), and several sieves (440) are installed inside the support (430) to separate the iron-carbon filler (410) in different areas. The particle size of the iron-carbon filler (410) is 12-18 mm, and the volume ratio of the iron-carbon filler (410) in the first iron-carbon micro-electrolysis cell (450) or the second iron-carbon micro-electrolysis cell (460) is 50-55%. The Fenton reaction module (500) includes a first module and a second module connected in parallel. The first module includes a first Fenton reactor (520) and a third Fenton reactor (530) connected in series. The second module includes a second Fenton reactor (540) and a fourth Fenton reactor (550) connected in series. The Fenton reaction module (500) is equipped with a reflux module; After collection, the wastewater flows into the first coagulation sedimentation tank (200), where wastewater treatment agents are added. The wastewater treatment agents include the following components: polyaluminum chloride and polyacrylamide, wherein the weight ratio of polyaluminum chloride to polyacrylamide is 50-60:3-10.

2. The water-based paint production wastewater treatment device according to claim 1, characterized in that: In the device, a water collection tank (100) is connected to one end near the first coagulation sedimentation tank (200), and a filter is connected to one end near the second coagulation sedimentation tank (600).

3. The water-based paint production wastewater treatment device according to claim 1, characterized in that: The screen (440) is uniformly provided with porous aeration pipes (420) with a diameter of 50-70cm along the vertical direction.

4. The water-based paint production wastewater treatment device according to claim 1, characterized in that: The first Fenton reactor (520), the third Fenton reactor (530), the second Fenton reactor (540) and the fourth Fenton reactor (550) are all cylindrical structures. An ultraviolet lamp (510) is provided at the center of the cylindrical structure, and the inner wall of the cylindrical structure is made of reflective material.

5. A method for treating water-based paint production wastewater using the water-based paint production wastewater treatment device as described in any one of claims 1 to 4, characterized in that: Includes the following steps: S1 The wastewater is sequentially fed into the pH adjustment tank (300), the iron-carbon micro-electrolysis reaction module (400) and the Fenton reaction module (500). The Fenton reaction module (500) is equipped with a reflux module so that the wastewater is treated multiple times in the Fenton reaction module (500). S2 The wastewater treated by S1 enters the second coagulation sedimentation tank (600), and after treatment, qualified effluent is obtained.

6. The method according to claim 5, characterized in that: In the pH adjustment tank (300), the pH is maintained at 2.5-3.5.

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