Electrochemical treatment device for printing and dyeing wastewater

Abstract

The utility model provides an electrochemical treatment device for printing and dyeing wastewater, which comprises an electrolysis tank, electrolyte is filled in the electrolysis tank, the electrolysis tank is connected with a pretreatment filter tank through a sewage pipe, a water inlet pipe is arranged on the pretreatment filter tank, a drain pipe is arranged on the electrolysis tank, and a filter screen is arranged in the pretreatment filter tank. Ultrasonic purification devices are arranged at the upper end and the lower end of the filter screen, a blow-off pipe is further arranged on the side, away from the sewage pipe, of the filter screen, the blow-off pipe is connected to the bottom of the pretreatment filter box, a blow-off pump is arranged on the blow-off pipe, a power box is arranged on the electrolysis box, the power box is connected with a cathode bar and an anode bar, and the cathode bar and the anode bar both extend into the electrolyte. According to the utility model, the pretreatment filter box is arranged to adjust the water quality and the water quantity of the printing and dyeing wastewater, so that the subsequent electrochemical treatment is efficiently carried out, the printing and dyeing wastewater is effectively treated, and good economic and social benefits are generated.

Description

Technical Field

[0001] The utility model relates to the technical field of printing and dyeing wastewater treatment, in particular to an electrochemical treatment device for printing and dyeing wastewater. Background Art

[0002] With the development of the dye production and printing and dyeing industries, the discharge of dye industrial wastewater has increased sharply. It is investigated that about 160 million cubic meters of dye wastewater are discharged into the water environment in China every year. And dye wastewater has the characteristics of high chroma, high content of organic pollutants, complex components, large water quality changes and high biological toxicity, and is difficult to be biodegraded, and is developing in the direction of anti-photolysis and anti-oxidation, which further increases the difficulty of treating dye wastewater. Printing and dyeing wastewater contains a large amount of organic pollutants. Discharging it into water bodies will consume dissolved oxygen, destroy the water ecological balance, and endanger the survival of fish and other aquatic organisms. The organic matter sinking to the bottom of the water will produce harmful gases such as hydrogen sulfide due to anaerobic decomposition, deteriorating the environment. Due to the above points, it has become one of the difficult-to-treat industrial wastewaters at home and abroad. China has listed the treatment of dye wastewater as the focus of environmental protection work.

[0003] At present, the treatment methods of printing and dyeing wastewater mainly include biological method, flocculation method, chemical oxidation method and electrochemical method. The biological treatment process has a low operating cost, but the degradation process takes a long time, and the floor area and construction investment of its equipment are very large. The flocculation method has lower engineering investment and less floor area than the biological treatment method, but the flocculation method has the disadvantages of poor decolorization effect on hydrophilic dyes, long treatment time, generating a large amount of sludge and difficult sewage disposal, etc. This is the main reason affecting the wide application of the flocculation method in engineering practice. The chemical oxidation method mainly refers to the ozone oxidation method. Ozone oxidation has a wide adaptability to dye varieties and high decolorization efficiency, but the main disadvantage of the ozone oxidation method is the high operating cost.

[0004] The electrochemical method for treating printing and dyeing wastewater generally does not need to add chemical drugs, has simple post-treatment and convenient management, and is called a clean treatment method. The electrochemical reaction device has a simple process, strong controllability and mild conditions, and can generally be carried out at normal temperature and pressure. The electrochemical method also has the functions of oxidation-reduction, adsorption and flocculation, and has a good treatment effect on refractory organic matter. The power sources used in the electrochemical oxidation method mainly include direct current power supply, pulse power supply and high-energy electron beam, etc. The traditional electrochemical method generally uses a direct current power supply as the functional device, but this method has the disadvantages of high power consumption, easy scaling and passivation of the electrode, and low treatment efficiency. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the defects of the prior art, and provides an electrochemical treatment device for printing and dyeing wastewater, which has low treatment cost, good treatment effect and can reduce the secondary pollution of printing and dyeing wastewater.

[0006] The utility model provides the following technical solutions:

[0007] The utility model provides an electrochemical treatment device for printing and dyeing wastewater, which comprises an electrolysis tank filled with electrolyte. The electrolysis tank is connected with a pretreatment filtration tank through a sewage pipe. The pretreatment filtration tank is provided with a water inlet pipe, and the electrolysis tank is provided with a drain pipe. A filter screen is arranged in the pretreatment filtration tank, and ultrasonic purification devices are arranged at both the upper and lower ends of the filter screen. A sewage discharge pipe is further arranged on one side of the filter screen away from the sewage pipe. The sewage discharge pipe is connected to the bottom of the pretreatment filtration tank, and a sewage discharge pump is arranged on the sewage discharge pipe. A power supply box is arranged on the electrolysis tank, and the power supply box is connected with a cathode rod and an anode rod, and both the cathode rod and the anode rod extend into the electrolyte.

[0008] Furthermore, the water inlet pipe is welded on the other side of the pretreatment filtration tank opposite to the sewage pipe, and the drain pipe is welded on the other side of the electrolysis tank opposite to the sewage pipe. The printing and dyeing wastewater enters the pretreatment filtration tank from the water inlet pipe, and after intercepting large particles through filtration, it enters the electrolysis tank from the sewage pipe for electrolysis treatment.

[0009] Furthermore, an air vent is opened at the upper end of the electrolysis tank. Opening the air vent facilitates the discharge of the gas generated by the electrolysis reaction.

[0010] Furthermore, the power supply box is a pulse power supply box. Using a pulse power supply for the power supply box can slow down the scaling and passivation phenomenon of the electrodes.

[0011] Furthermore, a heating device is further arranged on the electrolysis tank, and the heating device is arranged at the bottom of the electrolysis tank. Setting the heating device can accelerate the electrolysis reaction and shorten the reaction treatment time.

[0012] Furthermore, the cathode rod is made of cast iron chips, the anode plate is made of graphite, and the electrolyte is a sodium chloride solution.

[0013] The utility model has the following beneficial effects:

[0014] The utility model sets a pretreatment filtration tank to adjust the water quality and water volume of the printing and dyeing wastewater. The filter screen intercepts large particles in the wastewater and adjusts the water volume, which can relieve the subsequent electrolysis treatment pressure. At the same time, the ultrasonic purification device is used to treat the filter screen to prevent the filter screen from being blocked. The intercepted large particles are discharged through the sewage discharge pipe. The printing and dyeing wastewater enters the electrolysis tank for electrochemical treatment after passing through the pretreatment filtration tank, so that the printing and dyeing wastewater can be effectively treated. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a top view (showing the internal structure) of the electrochemical treatment device in an embodiment of the present invention;

[0017] Figure 2 It is a side view (showing the internal structure) of the electrochemical treatment device in an embodiment of the present invention;

[0018] Figure 3 It is a schematic structural diagram of the filter screen in an embodiment of the present invention;

[0019] In the figure: 1 - electrolysis tank; 2 - pretreatment filter tank; 3 - cathode rod; 4 - anode rod; 5 - power supply box, 6 - filter screen, 7 - ultrasonic purification device; 8 - sewage pipe; 9 - ventilation port; 10 - heating device; 11 - drain pipe; 12 - water inlet pipe; 13 - sewage pump; 14 - sewage discharge pipe; 15 - intercepting tank. Detailed implementation manners

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] See Figure 1 、 Figure 2, an embodiment of the present utility model provides an electrochemical treatment device for printing and dyeing wastewater, including an electrolysis tank filled with electrolyte. The electrolysis tank is connected to a pretreatment filtration tank through a sewage pipe. The pretreatment filtration tank is provided with a water inlet pipe, and the electrolysis tank is provided with a drain pipe. A filter screen is arranged in the pretreatment filtration tank, and VGT-2120QTD type ultrasonic purification devices are arranged at both the upper and lower ends of the filter screen. On the side of the filter screen away from the sewage pipe, there is also a sewage discharge pipe connected to the bottom of the pretreatment filtration tank. A sewage pump is arranged on the sewage discharge pipe. A power supply box is arranged on the electrolysis tank, and the power supply box is connected to a cathode rod and an anode rod, both of which extend into the electrolyte. In this embodiment, a retention groove is opened at the bottom of the pretreatment filtration tank, and large particles blocked by the filter screen can deposit and accumulate in the retention groove. A connecting pipe is welded on the retention groove, and the sewage discharge pipe is communicated with the connecting pipe to discharge the large particles in the printing and dyeing wastewater. The sewage discharge pipe and the connecting pipe can be integrally formed to form an L-shaped pipe.

[0022] The device is provided with a pretreatment filtration tank to adjust the water volume and water quality. The filter screen is used to intercept larger particles in the printing and dyeing wastewater, preventing subsequent pressure on the electrolysis tank for treating printing and dyeing wastewater while adjusting the water quality. At the same time, ultrasonic purification devices are arranged at both the upper and lower ends of the filter screen to clean the filter screen, reducing the occurrence of blockage problems. The intercepted large particles are discharged through the sewage discharge pipe under the action of the sewage pump.

[0023] As a preferred solution, the water inlet pipe is welded on the other side of the pretreatment filtration tank relative to the sewage pipe, and the drain pipe is welded on the other side of the electrolysis tank relative to the sewage pipe.

[0024] As a preferred solution, a ventilation port is opened at the upper end of the electrolysis tank, which is convenient for discharging the gas generated by the electrolysis reaction.

[0025] As a preferred solution, the power supply box is a pulse power supply box. Using a pulse power supply for the power supply box can slow down the scaling and passivation phenomenon of the electrodes.

[0026] As a preferred solution, a heating device is also arranged on the electrolysis tank, and the heating device is arranged at the bottom of the electrolysis tank. Setting the heating device can accelerate the electrolysis reaction and shorten the reaction treatment time. In a specific embodiment, the heating device can select the SRXY2-380V / 7KW type tubular electric heating component of Jiangsu Jiuyi Electric Power Equipment Co., Ltd.

[0027] As a preferred solution, the cathode rod is made of cast iron filings, the anode plate is made of graphite, and the electrolyte is a sodium chloride solution.

[0028] When the utility model is in use, printing and dyeing wastewater is centrally treated in the pretreatment filtration tank through the water inlet pipe to adjust the water volume and water quality. At the same time, the printing and dyeing wastewater successively passes through the filter screen to intercept larger particles in the printing and dyeing wastewater, reducing the subsequent treatment pressure on the electrolysis tank. The larger particles in the intercepted part are discharged through the sewage discharge pipe by the sewage pump. After the interception, the printing and dyeing wastewater enters the electrolysis tank through the sewage pipe. Then, turn on the pulse power switch at the upper part of the electrolysis tank, pay attention to the connection of the power cord corresponding to the cathode rod and the anode rod. At the same time, turn on the switch of the heating device, electrolyze for a period of time, and the generated gas is discharged from the ventilation port. After waiting for the reaction to complete, the treated qualified wastewater is discharged from the drain pipe.

[0029] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An electrochemical treatment device for printing and dyeing wastewater, comprising an electrolysis tank filled with electrolyte inside, characterized in that, The electrolysis tank is connected to a pretreatment filtration tank through a sewage pipe. The pretreatment filtration tank is provided with a water inlet pipe, and the electrolysis tank is provided with a drain pipe. A filter screen is arranged inside the pretreatment filtration tank, and ultrasonic purification devices are arranged at both the upper and lower ends of the filter screen. A sewage discharge pipe is further arranged on one side of the filter screen away from the sewage pipe. The sewage discharge pipe is connected to the bottom of the pretreatment filtration tank, and a sewage pump is arranged on the sewage discharge pipe. A retention groove is formed at the bottom of the pretreatment filtration tank, and a connecting pipe is welded on the retention groove. The connecting pipe is communicated with the sewage discharge pipe. A power supply box is arranged on the electrolysis tank, and the power supply box is connected with a cathode rod and an anode rod. Both the cathode rod and the anode rod extend into the electrolyte solution.

2. The electrochemical treatment device for printing and dyeing wastewater according to claim 1, characterized in that: The water inlet pipe is welded on the other side of the pretreatment filtration tank opposite to the sewage pipe, and the drain pipe is welded on the other side of the electrolysis tank opposite to the sewage pipe.

3. The electrochemical treatment device for printing and dyeing wastewater according to claim 1, characterized in that: An air vent is formed at the upper end of the electrolysis tank.

4. The electrochemical treatment device for printing and dyeing wastewater according to claim 1, wherein: The power supply box is a pulse power supply box.

5. The electrochemical treatment device for printing and dyeing wastewater according to claim 1, characterized in that: A heating device is further arranged on the electrolysis tank, and the heating device is arranged at the bottom of the electrolysis tank.

6. The electrochemical treatment device for printing and dyeing wastewater according to claim 1, wherein: The cathode rod is made of cast iron filings, the anode rod is made of graphite, and the electrolyte solution is a sodium chloride solution.

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