Device for degrading dye wastewater

Abstract

The utility model discloses a device for degrading dye wastewater, which comprises a flocculation tank, a photodegradation tank and an adsorption tank which are sequentially communicated through a pipeline, an electrode bar and a pH meter are arranged in the flocculation tank, and the flocculation tank is respectively communicated with a wastewater liquid inlet pipe, a flocculant feeding pipe and an acid-base agent feeding pipe; a sealing baffle is arranged in the photodegradation pool, a light source is arranged between the sealing baffle and the inner wall of the photodegradation pool, and a photocatalyst is laid at the bottom of the photodegradation pool; an activated carbon layer partition plate is arranged in the adsorption tank. According to the utility model, through a multi-stage treatment process and combination of flocculation, photodegradation and adsorption technologies, the turbidity of wastewater and the content of part of organic matters can be reduced through flocculation pretreatment, and the load of a subsequent treatment unit is reduced; the degradation-resistant organic matters are further decomposed through light degradation; residual small-molecular organic matters and chromaticity are deeply removed through adsorption, the treatment efficiency of the dye wastewater is remarkably improved through multi-technology cooperative treatment, and various pollutants in the wastewater can be more comprehensively removed.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technology especially relates to a device of degrading dye wastewater. BACKGROUND

[0002] Dye wastewater refers to the general term of various wastewater discharged in the pretreatment, dyeing, printing and finishing process of cotton, wool, chemical fiber and other textile products, which has the characteristics of large water quantity, high colority, complex components, large water quality variation range and so on. Dye wastewater contains a large amount of organic pollutants, which will consume dissolved oxygen when discharged into water, destroy water ecological balance, endanger the survival of fish and other aquatic organisms, and produce harmful gases such as hydrogen sulfide due to anaerobic decomposition of organic matter in the water bottom, thus deteriorating the environment. Therefore, dye wastewater has become one of the difficult-to-treat industrial wastewater at home and abroad.

[0003] The treatment of dye wastewater has always been a problem in environmental protection. Although various physical and chemical methods and biological methods can be used for decolorization and degradation treatment of dye wastewater, the traditional treatment methods such as physical adsorption, chemical oxidation and biodegradation have problems such as low treatment efficiency, high cost or secondary pollution. Physical adsorption can remove part of the organic matter, but the removal effect of dissolved dyes and small molecular pollutants is limited. Chemical oxidation method has high treatment cost and is easy to produce secondary pollution; the treatment efficiency of biological degradation method is unstable due to the limitation of wastewater quality and temperature conditions. In recent years, photocatalytic degradation, flocculation and activated carbon adsorption technologies have been widely studied and shown good treatment effect. Although these technologies have their own advantages, single technology often cannot efficiently and stably treat dye wastewater. SUMMARY

[0004] The utility model aims at the above problems, and provides a device for degrading dye wastewater, which can realize efficient and stable treatment of dye wastewater through a multi-stage treatment process combined with flocculation, photodegradation and adsorption technology.

[0005] Technical scheme: The device for degrading dye wastewater comprises a flocculation tank, a photodegradation tank and an adsorption tank which are sequentially connected through pipelines, an electrode rod and a pH meter are arranged in the flocculation tank, the pH meter can monitor and adjust the pH value of wastewater in real time, so as to provide suitable conditions for flocculation reaction, the flocculation tank is respectively connected with a wastewater inlet pipe, a flocculant feeding pipe and an acid-base agent feeding pipe; a sealing baffle is arranged in the photodegradation tank, a light source is arranged between the sealing baffle and the inner wall of the photodegradation tank, and a photocatalyst is arranged at the bottom of the photodegradation tank; an activated carbon layer partition plate is arranged in the adsorption tank.

[0006] Further, a first filter device is arranged on the pipeline connecting the flocculation tank and the photodegradation tank.

[0007] Further, the pipeline, which is communicated between the light degradation tank and the adsorption tank, is provided with a second filtering device.

[0008] Further, the adsorption tank is communicated with a sewage pipeline, and the sewage pipeline is provided with a third filtering device.

[0009] The filtering device arranged on the pipeline connected with each treatment unit can effectively intercept particulate matters, prevent the particulate matters from entering subsequent treatment units and affecting treatment effect, and ensure the stability of device operation and water quality.

[0010] Further, the adsorption tank is communicated with a sewage pipeline, and the sewage pipeline is provided with a third filtering device.

[0011] Further, the flocculation tank is provided with a heating stirring rod, the heating stirring rod can make waste water and flocculants fully mix and be uniform, and the flocculation reaction is more sufficient.

[0012] Further, the flocculation tank is provided with a heating stirring rod, the heating stirring rod can make waste water and flocculants fully mix and be uniform, and the flocculation reaction is more sufficient.

[0013] Further, the waste water inlet pipe is connected with a waste water storage tank, and the waste water inlet pipe is provided with a first valve.

[0014] Further, the flocculant feeding pipe is connected with a flocculant storage tank, and the flocculant feeding pipe is provided with a second valve.

[0015] Further, the acid-alkali agent feeding pipe is connected with an acid-alkali tank, and the acid-alkali agent feeding pipe is provided with a third valve.

[0016] Further, the flocculation tank is provided with a heating stirring rod, the heating stirring rod can make waste water and flocculants fully mix and be uniform, and the flocculation reaction is more sufficient.

[0017] The valve can accurately control the flow and adding amount of waste water, flocculants and acid-alkali agents, and can flexibly adjust the treatment time of each reaction tank according to different waste water quality and treatment requirements, so that the fine control of the treatment process is realized, and the adaptability and treatment effect of the device are improved.

[0018] The working principle of the utility model is: firstly, the electrode stick in the flocculation tank is used to cooperate with the heating stirring stick, the electric flocculation and stirring are utilized to promote the full mixing of flocculant and waste water, the colloids and fine suspended matters in the waste water are destabilized and gathered to form large particle precipitates; then, in the photodegradation tank, the photocatalyst converts light energy into chemical energy under the irradiation of light source based on the semiconductor photocatalytic principle, generates hydroxyl radical with strong oxidizing property and oxidizes and decomposes the refractory organic dye molecules; finally, the adsorption tank utilizes the large specific surface area and rich pore structure of the activated carbon layer partition plate to adsorb and remove the residual organic matters in the waste water according to the adsorption principle. The treatment units are operated cooperatively, the scientific and reasonable treatment process is constructed according to the mass transfer, reaction kinetics and other principles in chemical engineering.

[0019] In addition, it needs to be particularly pointed out that the flocculation tank of the utility model is placed before the photodegradation tank, that is, the treatment of dye wastewater must follow the steps of flocculation first and then photodegradation, because the current photodegradation method cannot completely remove the colority of dye wastewater, and the treatment time is very long, and the wastewater is first treated in the flocculation tank, the colority ions in the dye wastewater are first settled, the colority is reduced to the limit colority of chemical treatment, and then enters the photodegradation tank, and the colority is further reduced by using photocatalytic technology.

[0020] Beneficial effects: compared with the prior art, the utility model has the following advantages: (1) the utility model combines flocculation, photodegradation and adsorption technology, the flocculation pretreatment can reduce the turbidity and part of the organic matter content of the wastewater, and reduce the load of the subsequent treatment unit; the photodegradation process further decomposes the refractory organic matter; the adsorption removes the residual small molecular organic matter and colority in depth, the multi-technology cooperative treatment significantly improves the treatment efficiency of the dye wastewater, and can more comprehensively remove various pollutants in the wastewater; (2) the precise pH adjustment and reaction optimization of the device, the high-efficiency pollutant removal capacity and the automatic operation improve the treatment efficiency, reduce the energy consumption, and will not produce secondary pollution, meet the environmental protection requirements; (3) the device has flexibility and expansibility, and can meet the treatment needs of different types of wastewater. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure schematic diagram of the utility model. DETAILED DESCRIPTION

[0022] The utility model will be further described below in combination with the drawings and examples.

[0023] As Figure 1As shown, a device for degrading dye wastewater includes a flocculation tank 1, a photodegradation tank 2 and an adsorption tank 3 connected in sequence through pipelines. The flocculation tank 1 is provided with an electrode rod 101 and a pH meter 102. The flocculation tank 2 is connected with a wastewater inlet pipe 4, a flocculant feeding pipe 5 and an acid-alkali agent feeding pipe 6. The other end of the wastewater inlet pipe 4 is connected with a wastewater storage tank 12. The other end of the flocculant feeding pipe 5 is connected with a flocculant storage tank 14. The other end of the acid-alkali agent feeding pipe 6 is connected with an acid-alkali tank 16. The photodegradation tank 2 is provided with a sealing baffle 201. A light source 202 is arranged between the sealing baffle 201 and the inner wall of the photodegradation tank 2. A photocatalyst 203 is laid at the bottom of the photodegradation tank 2. A stirring rod 204 is arranged in the photodegradation tank 2. The adsorption tank 3 is provided with a plurality of activated carbon layer partitions 301. The adsorption tank 3 is connected with a sewage pipeline 9.

[0024] In the embodiment, the photodegradation tank 2 adopts a fully-closed structure. The material of the external structure is a light-absorbing material, which can further improve the photocatalytic efficiency.

[0025] In the embodiment, the activated carbon layer partitions 301 are arranged in the adsorption tank 3 in an up-down interval. The activated carbon layer partitions 301 arranged in an interval increase the contact area of the activated carbon and the wastewater, thereby improving the wastewater purification efficiency. The activated carbon layer partitions 301 can be arranged in an up-down staggered manner or in a horizontal manner, which is not limited herein.

[0026] In order to improve the wastewater filtration and adsorption effect, a first filter device 7 is arranged on the pipeline connecting the flocculation tank 1 and the photodegradation tank 2. A second filter device 8 is arranged on the pipeline connecting the photodegradation tank 2 and the adsorption tank 3. A third filter device 10 is arranged on the sewage pipeline 9. The filter devices arranged on the pipelines connecting the treatment units can effectively intercept particulate matters, prevent the particulate matters from entering the subsequent treatment units and affecting the treatment effect, and ensure the stability of the device operation and the water quality.

[0027] In addition, the utility model also sets up a plurality of valves, be respectively: the first valve 13 is equipped with on the wastewater inlet pipe 4, the second valve 15 is equipped with on the flocculant feeding pipe 5, the third valve 17 is equipped with on the acid-alkali agent feeding pipe 6, the fourth valve 18 is equipped with on the pipeline connecting the flocculation tank 1 and the photodegradation tank 2, and is located between the flocculation tank 1 and the first filter device 7. The fifth valve 19 is equipped with on the pipeline connecting the photodegradation tank 2 and the adsorption tank 3, and is located between the second filter device 8 and the adsorption tank 3. The sixth valve 20 is equipped with on the sewage pipeline 9, and is located between the adsorption tank 3 and the third filter device 10. The flow and the adding amount of the wastewater, the flocculant and the acid-alkali agent can be accurately controlled through the valves. The treatment time of each reaction tank can be flexibly adjusted according to different wastewater qualities and treatment requirements, the fine control of the treatment process is realized, and the adaptability and the treatment effect of the device are improved.

[0028] The working process of the device for degrading dye wastewater is as follows: firstly, the wastewater enters the waste liquid storage tank 12, when the volume of the wastewater reaches the set value, the first valve 13 is opened, the wastewater enters the flocculation tank 1 through the wastewater inlet pipe 4, before flocculation, the pH value of the wastewater needs to be adjusted to the optimum range of flocculation reaction, which helps to improve the activity of the flocculant and optimize the generation of flocculation, the third valve 17 of the acid-base tank 16 is opened, the acid-base agent enters the flocculation tank 1 through the acid-base agent feeding pipe 6, according to the wastewater quality and the activity of the selected flocculant, the pH value is reasonably adjusted, so that it is always within the optimum flocculation pH range, the pH value is measured by the pH meter 102, the second valve 15 of the flocculant storage tank 14 is opened, the flocculant enters the flocculation tank 1 through the flocculant feeding pipe 5, at the same time, the electrode rod 101 starts to work, the flocculant and the wastewater react and deposit in the flocculation tank 1. The flocculant in the utility model can be dicyandiamide formaldehyde polycondensate, polyacrylamide, aluminum trichloride and the like, of course, other flocculants can also be selected according to the characteristics of the wastewater, which is not limited herein. Of course, in a more preferred embodiment, in order to make the flocculation reaction sufficient, the heating stirring rod 103 is arranged in the flocculation tank 1, the heating stirring rod 103 can promote the wastewater and the flocculant to mix uniformly and sufficiently, so that the flocculation reaction is more sufficient. After the flocculation reaction is completed, the fourth valve 18 is opened, the wastewater flows through the first filter device 7, the particulate matter is intercepted in the first filter device 7, then, the wastewater enters the photodegradation tank 2, by simultaneously starting the light source 202 and the stirring rod 204, the wastewater and the photocatalyst 203 are fully mixed to carry out the photocatalytic degradation reaction. After the photocatalytic degradation reaction is completed, the fifth valve 19 is opened, the wastewater enters the adsorption tank 3 after flowing through the second filter device 8, the wastewater is designed to be filtered first and then the valve is opened, which can ensure that the photocatalyst particles in the photodegradation tank 2 continue to remain in the tank and are repeatedly used, the activated carbon layer partition plate 301 on the adsorption tank 3 further adsorbs and purifies the wastewater, in order to accelerate the adsorption, the vacuum pump 11 connected with the adsorption tank 3 is further arranged outside the adsorption tank 3, the vacuum pump 11 is opened to accelerate the work, after the activated carbon adsorption is completed, the sixth valve 20 is opened, finally, the wastewater enters the sewage pipeline 9 after flowing through the third filter device 10, and the wastewater treatment is completed.

[0029] In summary, the utility model couples the multi-stage treatment process, that is, firstly, through the flocculation method, the pollutants originally dissolved in the wastewater or in the fine suspended state, which are not easy to settle and filter, are gathered into larger particles, so that the color-developing substances enriched in the wastewater are separated and removed; then, through the photodegradation method, under the condition of light, the photocatalyst oxidizes the hydroxyl radical and water molecules in the water into hydroxyl radicals with strong oxidizing property, and the hydroxyl radicals oxidize the refractory organic matter into carbon dioxide and water; finally, through the adsorption method, the water-soluble organic matter is removed by using the activated carbon with large specific surface area.

[0030] Compared with the existing single treatment technology of dye wastewater, the utility model combines the three technologies of flocculation, photodegradation and adsorption, utilizes respective advantages, and realizes efficient and stable treatment of dye wastewater.

Claims

1. A device for degrading dye wastewater, characterized by, The application relates to a wastewater treatment device, which comprises a flocculation tank (1), a photodegradation tank (2) and an adsorption tank (3) connected in sequence through pipelines, wherein an electrode rod (101) and a pH meter (102) are arranged in the flocculation tank (1), the flocculation tank (1) is connected with a wastewater inlet pipeline (4), a flocculant feeding pipeline (5) and an acid-alkali agent feeding pipeline (6) respectively, a sealing baffle (201) is arranged in the photodegradation tank (2), a light source (202) is arranged between the sealing baffle (201) and the inner wall of the photodegradation tank (2), and a photocatalyst (203) is arranged at the bottom of the photodegradation tank (2); and an activated carbon layer baffle (301) is arranged in the adsorption tank (3).

2. The apparatus of claim 1, wherein, A first filtering device (7) is arranged on the pipeline connecting the flocculation tank (1) and the photodegradation tank (2).

3. The apparatus of claim 2, wherein, A second filtering device (8) is arranged on the pipeline connecting the photodegradation tank (2) and the adsorption tank (3).

4. The apparatus of claim 3, wherein, The adsorption tank (3) is connected with a sewage pipeline (9), the third filtering device (10) is arranged on the sewage pipeline (9), and a vacuum pump (11) connected with the adsorption tank (3) is further arranged outside the adsorption tank (3).

5. The apparatus of claim 1, wherein, A heating stirring rod (103) is further arranged in the flocculation tank (1).

6. The apparatus of claim 1, wherein, A stirring rod (204) is further arranged in the photodegradation tank (2).

7. The apparatus of claim 1, wherein, The wastewater inlet pipeline (4) is connected with a wastewater storage tank (12), and a first valve (13) is arranged on the wastewater inlet pipeline (4).

8. The apparatus of claim 1, wherein, The flocculant feeding pipeline (5) is connected with a flocculant storage tank (14), and a second valve (15) is arranged on the flocculant feeding pipeline (5).

9. The apparatus of claim 1, wherein, The acid-alkali agent feeding pipeline (6) is connected with an acid-alkali tank (16), and a third valve (17) is arranged on the acid-alkali agent feeding pipeline (6).

10. The apparatus of claim 4, wherein, A fourth valve (18) is arranged on the pipeline connecting the flocculation tank (1) and the photodegradation tank (2) and located between the flocculation tank (1) and the first filtering device (7); a fifth valve (19) is arranged on the pipeline connecting the photodegradation tank (2) and the adsorption tank (3) and located between the second filtering device (8) and the adsorption tank (3); and a sixth valve (20) is arranged on the sewage pipeline (9) and located between the adsorption tank (3) and the third filtering device (10).

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