Printing and dyeing wastewater pretreatment device
By designing a printing and dyeing wastewater pretreatment device, using sludge reflux and activated carbon to optimize biochemical treatment, the problems of large sludge yield and poor water quality in traditional biological treatment processes are solved, and efficient water quality purification and cost reduction are achieved.
Patent Information
- Application Number
- CN202421147343.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-05-24
AI Technical Summary
Traditional biological treatment processes are difficult to effectively treat printing and dyeing wastewater, especially difficult to biochemically degrade organic matter and new additives, resulting in large sludge production, increasing water treatment costs, and poor water treatment effect, making it difficult to meet water quality standards below 200mg/L.
A pretreatment device for printing and dyeing wastewater is designed, including a regulation tank, a concrete floating tank, a preliminary sedimentation tank, a biochemical tank, a magnetic coagulation sedimentation tank and a sludge return pipeline, which is mixed with the effluent of the concrete floating tank through the sludge return and utilizes the Activated carbon adsorption removes pollutants, reduces liquid alkali injection through pH adjustment, adjusts the sewage ratio and enters the initial sedimentation tank and biochemical tank, and optimizes biochemical treatment.
The reuse of sludge has been achieved, the cost of sludge treatment is reduced, the water quality purification effect is improved, the liquid alkali injection is reduced, the sewage purification cost is reduced, and the water effluent treatment effect is improved.
Smart Images
Figure CN222362019U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of wastewater treatment, in particular to a printing and dyeing wastewater pretreatment 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 pretreatment device, which has the advantages of being able to reuse the generated sludge to purify water quality and reducing the sludge treatment cost.
[0005] The above technical objectives of the utility model are achieved through the following technical solutions:
[0006] A printing and dyeing wastewater pretreatment device comprises a regulating tank, a coagulation flotation tank, a primary sedimentation tank, a biochemical tank, a secondary sedimentation tank and a magnetic coagulation sedimentation tank which are sequentially connected through a main pipeline;
[0007] The outlet end of the coagulation flotation tank is connected to a first branch pipe, the main pipeline between the coagulation flotation tank and the primary sedimentation tank is provided with a port 1, the main pipeline between the primary sedimentation tank and the biochemical tank is provided with a port 2, and the two ends of the first branch pipe are respectively connected to the port 1 and the port 2;
[0008] The outlet end of the coagulation flotation tank is also provided with a sludge return pipeline, the main pipeline between the coagulation flotation tank and the primary sedimentation tank is also provided with a port three, the magnetic coagulation sedimentation tank is provided with a port four, and the two ends of the sludge return pipeline are respectively connected to the port three and the port four;
[0009] The sludge return pipe is provided with a branch return pipe, the sludge return pipe is provided with a port five, the biochemical pool is provided with a port six, and the two ends of the branch return pipe are respectively connected to the port five and the port six.
[0010] Preferably, the coagulation area of the coagulation flotation tank is provided with a first dosing site, and the first dosing site is used to add a reagent to achieve coagulation in the coagulation flotation tank.
[0011] Preferably, a regulating valve is provided in the port 1, and the regulating valve is used to control the proportion of the effluent from the coagulation flotation tank entering the first branch pipe.
[0012] Preferably, the port three is located on a side of the port one away from the coagulation flotation tank, and the port three is used to receive the sludge discharged from the magnetic coagulation sedimentation tank and mix it with the effluent from the coagulation flotation tank.
[0013] Preferably, one side of port two and port three is provided with a pipeline mixer, and a liquid alkali dosing point is provided on the pipeline mixer, and the liquid alkali dosing point is used for adding liquid alkali. The pipeline mixer on one side of port three is used to accelerate the mixing of sludge and the effluent from the coagulation flotation tank, and the pipeline mixer on one side of port two is used to accelerate the mixing of the effluent from the primary sedimentation tank and the effluent from the first branch pipe.
[0014] Preferably, the front ends of the primary sedimentation tank and the biochemical tank are both provided with pH online monitoring devices, the pH in the primary sedimentation tank is controlled between 7.0-7.5, the pH in the biochemical tank is controlled between 7.5-8.0, and the liquid alkali dosing point is electrically connected to the two pH online monitoring devices.
[0015] Preferably, the magnetic coagulation sedimentation tank is provided with an activated carbon addition site and a magnetic powder addition site, the activated carbon addition site is used for adding activated carbon, the magnetic powder addition site is used for supplementing the addition of magnetic powder, the magnetic powder is used to accelerate sedimentation, and a magnetic separator is also provided in the magnetic coagulation sedimentation tank, the magnetic separator is used to recover the magnetic powder.
[0016] The beneficial effects of the utility model are as follows: the treatment device of the present application can adjust the proportion of sewage entering the primary sedimentation tank and the biochemical tank according to the pollutant concentration and the water volume. The sludge produced by the magnetic coagulation sedimentation tank will also be transported to the outlet end of the coagulation flotation tank through the sludge return pipe to mix it with the outlet water in the coagulation flotation tank. The activated carbon in the sludge can be used to adsorb and remove pollutants, and the activated carbon sludge can be used to perform preliminary pH adjustment to reduce the addition of liquid alkali, thereby reducing the cost of sewage purification. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of an embodiment.
[0018] Figure numerals: 1. regulating tank; 2. coagulation flotation tank; 3. primary sedimentation tank; 4. biochemical tank; 5. secondary sedimentation tank; 6. magnetic coagulation sedimentation tank; 7. first branch pipe; 8. sludge return pipe; 9. branch return pipe; 10. regulating valve; 11. pipeline mixer. DETAILED DESCRIPTION
[0019] 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.
[0020] like Figure 1 As shown, a printing and dyeing wastewater pretreatment device includes a regulating tank 1, a coagulation flotation tank 2, a primary sedimentation tank 3, a biochemical tank 4, a secondary sedimentation tank 5 and a magnetic coagulation sedimentation tank 6 which are sequentially connected through a main pipeline; two adjacent tanks can be transmitted through the main pipeline.
[0021] In this design, the printing and dyeing wastewater to be treated is first regulated in the regulating tank 1, and the regulated parameters include the water volume, water quality, pH value and water temperature of the wastewater; then the effluent from the regulating tank 1 enters the coagulation flotation tank 2, and the sewage is coagulated in the coagulation flotation tank 2; a first dosing point is set in the coagulation area of the coagulation flotation tank 2, and a chemical is added at the first dosing point to promote coagulation in the coagulation flotation tank 2.
[0022] Afterwards, the effluent from the coagulation flotation tank 2 can enter the primary sedimentation tank 3 through the main pipeline for primary sedimentation, and the effluent from the primary sedimentation tank 3 enters the biochemical tank 4; the effluent from the biochemical tank 4 enters the secondary sedimentation tank 5 for sedimentation, and then the effluent from the secondary sedimentation tank 5 enters the magnetic coagulation sedimentation tank 6 for treatment. The sewage treated by the magnetic coagulation sedimentation tank 6 meets the discharge standard and can be discharged.
[0023] The outlet end of the coagulation flotation tank 2 is connected with a first branch pipe 7, a port 1 is provided on the main pipeline between the coagulation flotation tank 2 and the primary sedimentation tank 3, a port 2 is provided on the main pipeline between the primary sedimentation tank 3 and the biochemical tank 4, and both ends of the first branch pipe 7 are respectively connected to the port 1 and the port 2, and a regulating valve 10 is provided in the port 1, through which the proportion of the effluent of the coagulation flotation tank 2 flowing into the first branch pipe 7 and flowing along the main pipeline can be adjusted, so that part of the effluent of the coagulation flotation tank 2 can directly enter the biochemical tank 4 through the first branch pipe 7. The regulating valve 10 is used to control the proportion of the effluent of the coagulation flotation tank 2 entering the first branch pipe 7, so that all the effluent of the coagulation flotation tank 2 can enter the first branch pipe 7 at the maximum, and all the effluent of the coagulation flotation tank 2 can not enter the first branch pipe 7 at the minimum.
[0024] The outlet of the coagulation flotation tank 2 is also provided with a sludge return pipe 8, the main pipe between the coagulation flotation tank 2 and the primary sedimentation tank 3 is also provided with a port 3, the magnetic coagulation sedimentation tank 6 is provided with a port 4, and the two ends of the sludge return pipe 8 are respectively connected to the port 3 and the port 4. The sludge return pipe 8 can send the sludge discharged from the magnetic coagulation sedimentation tank 6 back to the port 3, so that the sludge is mixed with the effluent of the coagulation flotation tank 2, and the pollutants are removed by adsorption using the activated carbon in the sludge, and the pH is initially adjusted by using the activated carbon sludge to reduce the addition of liquid alkali.
[0025] A pipeline mixer 11 is provided on one side of port 2 and port 3. A liquid alkali dosing point is provided on the pipeline mixer 11. Liquid alkali and other agents can be added to the liquid alkali dosing point. The pipeline mixer 11 can accelerate the mixing of sludge, effluent from the coagulation and flotation tank 2 and the added agents, or effluent from the primary sedimentation tank 3, effluent from the first branch pipe 7 and the added agents, so that the three can be fully mixed. The front ends of the primary sedimentation tank 3 and the biochemical tank 4 are both provided with a pH online monitoring device. The pH in the primary sedimentation tank 3 is controlled between 7.0-7.5, and the pH in the biochemical tank 4 is controlled between 7.5-8.0; the amount of liquid alkali added can be adjusted in time to ensure the stability of the biochemical system.
[0026] The sludge return pipe 8 is provided with a branch return pipe 9, the sludge return pipe 8 is provided with a port 5, the biochemical tank 4 is provided with a port 6, and the two ends of the branch return pipe 9 are respectively connected to the port 5 and the port 6. The sludge discharged from the magnetic coagulation sedimentation tank 6 will also enter the biochemical tank 4 from the branch return pipe 9, and the biochemical treatment efficiency is improved by adsorption and promotion of microbial attachment and growth.
[0027] The magnetic coagulation sedimentation tank 6 is provided with an activated carbon addition site and a magnetic powder addition site. The activated carbon addition site is used to add activated carbon, and the magnetic powder addition site is used to supplement the addition of magnetic powder. The magnetic powder can accelerate the precipitation of activated carbon and impurities in the magnetic coagulation sedimentation tank 6. A magnetic separator is also provided in the magnetic coagulation sedimentation tank 6, and the magnetic separator can recycle the magnetic powder for reuse.
[0028] 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 pretreatment device, characterized in that: It comprises a regulating tank (1), a coagulation and flotation tank (2), a primary sedimentation tank (3), a biochemical tank (4), a secondary sedimentation tank (5) and a magnetic coagulation and sedimentation tank (6) which are sequentially connected through a main pipeline; The outlet end of the coagulation flotation tank (2) is connected to a first branch pipe (7), a main pipe between the coagulation flotation tank (2) and the primary sedimentation tank (3) is provided with a port 1, a main pipe between the primary sedimentation tank (3) and the biochemical tank (4) is provided with a port 2, and two ends of the first branch pipe (7) are respectively connected to the port 1 and the port 2; The outlet end of the coagulation and flotation tank (2) is also provided with a sludge return pipe (8), the main pipe between the coagulation and flotation tank (2) and the primary sedimentation tank (3) is also provided with a port three, the magnetic coagulation and sedimentation tank (6) is provided with a port four, and the two ends of the sludge return pipe (8) are respectively connected to the port three and the port four; The sludge return pipe (8) is provided with a branch return pipe (9), the sludge return pipe (8) is provided with a port five, the biochemical pool (4) is provided with a port six, and the two ends of the branch return pipe (9) are respectively connected to the port five and the port six.
2. A printing and dyeing wastewater pretreatment device according to claim 1, characterized in that: The coagulation area of the coagulation flotation tank (2) is provided with a first dosing site, and the first dosing site is used to add a reagent to cause coagulation in the coagulation flotation tank (2).
3. A printing and dyeing wastewater pretreatment device according to claim 1, characterized in that: The port 1 is provided with a regulating valve (10), and the regulating valve (10) is used to control the proportion of the effluent from the coagulation flotation tank (2) entering the first branch pipe (7).
4. A printing and dyeing wastewater pretreatment device according to claim 1, characterized in that: The port three is located on a side of the port one away from the coagulation flotation tank (2), and the port three is used to receive the sludge discharged from the magnetic coagulation sedimentation tank (6) and mix it with the effluent from the coagulation flotation tank (2).
5. A printing and dyeing wastewater pretreatment device according to claim 4, characterized in that: A pipeline mixer (11) is provided on one side of the port two and the port three. A liquid alkali dosing point is provided on the pipeline mixer (11). The liquid alkali dosing point is used to add liquid alkali. The pipeline mixer (11) on one side of the port three is used to accelerate the mixing of sludge and the effluent of the coagulation flotation tank (2). The pipeline mixer (11) on one side of the port two is used to accelerate the mixing of the effluent of the primary sedimentation tank (3) and the effluent of the first branch pipe (7).
6. A printing and dyeing wastewater pretreatment device according to claim 5, characterized in that: The front ends of the primary sedimentation tank (3) and the biochemical tank (4) are both provided with pH online monitoring devices. The pH in the primary sedimentation tank (3) is controlled between 7.0 and 7.5, and the pH in the biochemical tank (4) is controlled between 7.5 and 8.
0. The liquid alkali dosing point is electrically connected to the two pH online monitoring devices.
7. A printing and dyeing wastewater pretreatment device according to claim 1, characterized in that: The magnetic coagulation sedimentation tank (6) is provided with an activated carbon addition site and a magnetic powder addition site, wherein the activated carbon addition site is used for adding activated carbon, and the magnetic powder addition site is used for supplementing the addition of magnetic powder, wherein the magnetic powder is used for accelerating sedimentation. The magnetic coagulation sedimentation tank (6) is also provided with a magnetic separator, wherein the magnetic separator is used for recovering the magnetic powder.