Printing and dyeing wastewater pre-oxidation treatment device

Abstract

The utility model discloses a pre-oxidation treatment device for printing and dyeing wastewater. The pre-oxidation treatment device comprises an adjusting tank, a coagulative precipitation tank, a pre-oxidation tank, a pre-oxidation tank, a pre-aeration tank, a biochemical tank and a secondary sedimentation tank which are sequentially connected through a main pipeline, a gas guide pipe is arranged on the pre-oxidation tank, one end of the gas guide pipe is connected with a gas outlet in the pre-oxidation tank, the other end of the gas guide pipe is connected to the lower end of the biochemical pool, a tail gas treatment device is arranged on the gas guide pipe, and the gas guide pipe conveys tail gas treated by the tail gas treatment device into the biochemical pool; the water inlet end of the pre-oxidation tank is higher than the water outlet end of the pre-oxidation tank, and the air outlet of the pre-oxidation tank is higher than the water inlet end of the pre-oxidation tank. The sewage treatment device is reasonable in structure and good in impact resistance, and stable and efficient sewage treatment can be realized by adding a small amount of chemicals.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a printing and dyeing wastewater pre-oxidation treatment device. Background Art

[0002] Printing and dyeing enterprises are major emitters of industrial wastewater, which is difficult to treat due to its large volume, high content of organic pollutants, deep chromaticity, high alkalinity, and large changes in water quality. At present, the commonly used printing and dyeing wastewater treatment processes in China are mainly divided into two categories: one is the physical and chemical method, and the other is the biochemical method. In recent years, a large number of difficult-to-biodegrade organic matter and new additives have entered the printing and dyeing wastewater, and the traditional biological treatment process has been seriously challenged.

[0003] The most popular pretreatment method at present is to use biochemical + physicochemical methods, but it is generally difficult to treat the effluent to below 200 mg / L. There are also advanced oxidation methods such as Fenton, but the sludge output is large, which increases the cost of water treatment. In response to the above problems, a solution is proposed below. Utility Model Content

[0004] The utility model aims to provide a printing and dyeing wastewater pre-oxidation treatment device, which has the advantages of high treatment efficiency and low cost.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A printing and dyeing wastewater pre-oxidation treatment device comprises a regulating tank, a coagulation sedimentation tank, a pre-oxidation tank, a pre-oxidation tank, a pre-aeration tank, a biochemical tank and a secondary sedimentation tank which are sequentially connected through a main pipeline; an air guide pipe is arranged on the pre-oxidation tank, one end of the air guide pipe is connected to the air outlet on the pre-oxidation tank, and the other end of the air guide pipe is connected to the lower end of the biochemical tank; an exhaust gas treatment device is arranged on the air guide pipe, and the air guide pipe transports the exhaust gas treated by the exhaust gas treatment device to the biochemical tank;

[0007] The water inlet of the pre-oxidation tank is located higher than the water outlet, and the gas outlet of the pre-oxidation tank is located higher than the water inlet.

[0008] Preferably, a first dosing site is provided in the coagulation area of ​​the coagulation sedimentation tank, and the first dosing site is used for adding ferrous iron, liquid alkali and PAM.

[0009] Preferably, a first pH monitoring device is provided in the sedimentation area of ​​the coagulation sedimentation tank, and the first pH monitoring device is used to monitor the pH value of the sedimentation area online to achieve regulation of the pH value of the sedimentation area.

[0010] Preferably, a second dosing point and a second agitator are provided in the pre-oxidation tank, the second dosing point is used for adding hydrogen peroxide, and the second agitator is used for accelerating the oxidation rate in the pre-oxidation tank.

[0011] Preferably, an ozone micro-aeration device and a first agitator are provided at the bottom of the pre-oxidation tank, and the tail gas treatment device located at the upper end of the pre-oxidation tank is an ozone tail gas collection and destruction device.

[0012] Preferably, a first micro-aeration device is provided at the bottom of the pre-aeration tank.

[0013] The beneficial effects of the utility model are as follows: before the device of the present application performs biochemical treatment on the sewage, it will first undergo two oxidation treatments, and the Fe in the sewage will be removed by hydrogen peroxide in the pre-oxidation tank. 2+ Oxidized to Fe 3+ Then, in the pre-oxidation tank, ozone is used to accelerate the Fe 2+ The organic matter is initially degraded and destroyed through the catalytic oxidation of ozone and hydrogen peroxide to improve its biodegradability, so that the subsequent biochemical treatment can better purify the sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an embodiment.

[0015] Figure numerals: 1. regulating tank; 2. coagulation sedimentation tank; 3. pre-oxidation tank; 4. pre-oxidation tank; 5. pre-aeration tank; 6. biochemical tank; 7. secondary sedimentation tank; 8. air guide pipe; 9. second agitator; 10. ozone micro-aeration device; 11. first agitator; 12. first micro-aeration device; 13. ozone tail gas collection and destruction device. DETAILED DESCRIPTION

[0016] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. The same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom" and "top", "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0017] like Figure 1As shown, a printing and dyeing wastewater pre-oxidation treatment device comprises a regulating tank 1, a coagulation sedimentation tank 2, a pre-oxidation tank 3, a pre-oxidation tank 4, a pre-aeration tank 5, a biochemical tank 6 and a secondary sedimentation tank 7 which are sequentially connected through a main pipeline. In the present application, the sewage first enters the regulating tank 1 for regulation, then enters the coagulation sedimentation tank 2 for coagulation and sedimentation, and then undergoes two oxidations through the pre-oxidation tank 3 and the pre-oxidation tank 4. The oxidized sewage enters the pre-aeration tank 5 for aeration, then enters the biochemical tank 6 for biochemical treatment, and finally enters the secondary sedimentation tank 7 for sedimentation. The liquid after sedimentation is the treated sewage.

[0018] When the regulated sewage enters the coagulation sedimentation tank 2, it will first enter the coagulation area of ​​the coagulation sedimentation tank 2. A first dosing site is provided in the coagulation area of ​​the coagulation sedimentation tank 2. The first dosing site can add ferrous iron, liquid alkali and PAM and other agents to promote the coagulation of substances in the sewage. After that, the sewage in the coagulation area will enter the sedimentation area of ​​the coagulation sedimentation tank 2. A first pH monitoring device is provided in the sedimentation area of ​​the coagulation sedimentation tank 2. The first pH monitoring device is used to monitor the pH value of the sedimentation area online, so that the pH value of the sedimentation area is controlled at 7.0-7.5. The dosage of the front-end liquid alkali and other agents is adjusted in time according to the value of the online pH value, and the pH balance is performed while ensuring the sedimentation effect.

[0019] The sewage after coagulation and sedimentation will enter the pre-oxidation tank 3, and the pre-oxidation tank 3 is provided with a second dosing point and a second agitator 9. The second dosing point is used to add hydrogen peroxide, which can oxidize the Fe2+ remaining in the sewage into Fe3+, avoid competing for oxygen in the biochemical tank 6, avoid affecting the growth of nitrifying bacteria and the removal of ammonia nitrogen, and promote simultaneous nitrification and denitrification. The second agitator 9 is a commonly used stirring structure, such as a stirring rod and a power source capable of providing rotational power. The second agitator 9 can accelerate the oxidation speed in the pre-oxidation tank 3.

[0020] The sewage oxidized by the pre-oxidation tank 3 enters the pre-oxidation tank 4. The bottom of the pre-oxidation tank 4 is provided with an ozone micro-aeration device 10 and a first agitator 11. The ozone micro-aeration device 10 can introduce ozone into the pre-oxidation tank 4 to further oxidize the sewage in the pre-oxidation tank 4 and accelerate the oxidation of Fe2+ to Fe3+. In addition, through the catalytic oxidation of ozone and hydrogen peroxide, the organic matter is initially degraded and destroyed to improve the biodegradability of the organic matter. The first agitator 11 has a similar function and principle to the second agitator 9, and is used to improve the oxidation efficiency in the pre-oxidation tank 4.

[0021] The water inlet of the pre-oxidation tank 4 is higher than the water outlet, and the water inlet is higher than the sewage level inside the pre-oxidation tank 4 to prevent the liquid in the pre-oxidation tank 4 from flowing back. The water outlet is set at the bottom of the pre-oxidation tank 4, so that the sewage flowing out of the water outlet has been completely oxidized by ozone.

[0022] The pre-oxidation tank 4 is provided with an air guide pipe 8, one end of which is connected to the gas outlet on the pre-oxidation tank 4, and the other end of which is connected to the lower end of the biochemical pool 6. The gas generated in the pre-oxidation tank 4 is sent into the biochemical pool 6 through the air guide pipe 8 as part of the gas source of the biochemical pool 6 to increase the dissolved oxygen content in the biochemical pool 6.

[0023] An exhaust gas treatment device is provided on the air duct 8 , and the exhaust gas treatment device is an ozone exhaust gas collection and destruction device 13 , which can destroy the ozone entering the air duct 8 from the pre-oxidation tank 4 to form oxygen, and then pass it into the biochemical pool 6 .

[0024] A first micro-aeration device 12 is provided at the bottom of the pre-aeration tank 5. The first micro-aeration device 12 accelerates the decomposition of residual hydrogen peroxide and ozone in the sewage through aeration, reduces the impact on the biochemical system, and increases subsequent dissolved oxygen.

[0025] The sewage treated with aeration is sent to the biochemical pool 6 for biochemical treatment. After two oxidations and one aeration, most of the substances that affect the biochemical treatment have been eliminated, which can improve the treatment efficiency of the biochemical pool 6 for sewage.

[0026] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A printing and dyeing wastewater pre-oxidation treatment device, characterized in that: It comprises a regulating tank (1), a coagulation sedimentation tank (2), a pre-oxidation tank (3), a pre-oxidation tank (4), a pre-aeration tank (5), a biochemical tank (6) and a secondary sedimentation tank (7) which are sequentially connected through a main pipeline; The pre-oxidation tank (4) is provided with an air guide pipe (8), one end of the air guide pipe (8) is connected to the gas outlet on the pre-oxidation tank (4), and the other end of the air guide pipe (8) is connected to the lower end of the biochemical pool (6). The air guide pipe (8) is provided with an exhaust gas treatment device, and the air guide pipe (8) transports the exhaust gas treated by the exhaust gas treatment device to the biochemical pool (6); The water inlet of the pre-oxidation tank (4) is located higher than the water outlet, and the air outlet of the pre-oxidation tank (4) is located higher than the water inlet.

2. A printing and dyeing wastewater pre-oxidation treatment device according to claim 1, characterized in that: A first dosing point is provided in the coagulation area of ​​the coagulation sedimentation tank (2), and the first dosing point is used for adding ferrous iron, liquid caustic soda and PAM.

3. A printing and dyeing wastewater pre-oxidation treatment device according to claim 2, characterized in that: A first pH monitoring device is provided in the sedimentation area of ​​the coagulation sedimentation tank (2), and the first pH monitoring device is used to monitor the pH value of the sedimentation area online to achieve regulation of the pH value of the sedimentation area.

4. A printing and dyeing wastewater pre-oxidation treatment device according to claim 1, characterized in that: A second dosing point and a second agitator (9) are provided in the pre-oxidation tank (3). The second dosing point is used for adding hydrogen peroxide, and the second agitator (9) is used for accelerating the oxidation speed in the pre-oxidation tank (3).

5. A printing and dyeing wastewater pre-oxidation treatment device according to claim 1, characterized in that: An ozone micro-aeration device (10) and a first agitator (11) are arranged at the bottom of the pre-oxidation tank (4), and the tail gas treatment device located at the upper end of the pre-oxidation tank (4) is an ozone tail gas collection and destruction device (13).

6. A printing and dyeing wastewater pre-oxidation treatment device according to claim 1, characterized in that: A first micro-aeration device (12) is provided at the bottom of the pre-aeration tank (5).

Images