Sewage treatment system
Through the multi-stage biochemical treatment of the sewage treatment system, ultrafiltration membrane and reverse osmosis membrane treatment and advanced oxidation technology, the problem of coal chemical sewage treatment is solved, efficient recycling and reuse of sewage is achieved, and the treatment effect and resource utilization are improved.
Patent Information
- Application Number
- CN202422020259.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-20
AI Technical Summary
It is difficult to achieve no recycling treatment of sewage treatment in coal chemical enterprises, resulting in the inability to rationally utilize water resources and the treatment effect does not meet the standards.
The sewage treatment system is adopted, including sewage biochemical units, recycled water reuse units and advanced oxidation units that are connected in sequence. Through multi-stage biochemical treatment, ultrafiltration membrane and reverse osmosis membrane treatment, combined with ozone catalytic oxidation, the deep treatment and recycling of sewage is achieved.
It significantly improves the pollutant removal rate, meets the use requirements of the circulating water system, realizes efficient recycling and reuse of sewage, reduces the amount of carbon source input, and effectively removes organic and microbial pollutants.
Smart Images
Figure CN223087715U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of wastewater treatment, and particularly to a sewage treatment system. Background Technique
[0002] With the popularization of the concepts of environmental protection and green development, and the rapid development of the coal chemical industry, in the face of a very severe environmental protection situation, some provinces and cities not only control the wastewater discharge quality to the first-class standard of the Comprehensive Wastewater Discharge Standard (GB 8978—1996) and the first-class A standard of the Pollutant Discharge Standard for Municipal Wastewater Treatment Plants (GB 18918—2002), but also put forward specific requirements for the total pollutant control. Traditional coal chemical enterprises have a large discharge volume, so refined environmental management is imperative. There are many types of coal chemical wastewater, and the components of pollutants in the water are complex, which is a typical difficult-to-treat industrial wastewater. This requires coal chemical enterprises to fully analyze the water quality and quantity when treating wastewater and select appropriate treatment processes according to local conditions. If the sewage treatment is improper, it will inevitably restrict the survival and development of the enterprise.
[0003] Coal chemical plants use traditional biochemical treatment processes without recovery treatment, and water resources cannot be rationally utilized. Utility Model Content
[0004] The purpose of the embodiments of this application is to provide a sewage treatment system to solve the technical problem that the sewage in coal chemical plants is not recovered and treated, and water resources cannot be rationally utilized.
[0005] To solve the above technical problem, the embodiments of this application provide the following technical solutions:
[0006] This application provides a sewage treatment system, which includes: a sewage biochemical unit, a reclaimed water reuse unit, and an advanced oxidation unit connected in sequence;
[0007] The sewage biochemical unit includes multiple-stage biochemical treatment ponds connected in sequence;
[0008] The reclaimed water reuse unit includes an ultrafiltration membrane device and a reverse osmosis membrane device connected in sequence. The outlet of the sewage biochemical unit is connected to the inlet of the ultrafiltration membrane device through a pipeline. The reverse osmosis water production outlet of the reverse osmosis membrane device is connected to the circulating water system. Part of the concentrated water and backwash water discharged from the ultrafiltration membrane device and the reverse osmosis membrane device are introduced into the sewage biochemical unit as a carbon source;
[0009] The advanced oxidation unit includes an advanced oxidation pond. The rest of the concentrated water and the backwash water are introduced into the advanced oxidation pond for treatment and then discharged.
[0010] In some modified embodiments of the present application, the multi-stage biochemical treatment tank includes: a first anoxic tank, a first aerobic tank, a second anoxic tank, and a second aerobic tank connected in sequence. A portion of the concentrated water and the backwash water is introduced into the second anoxic tank as a carbon source.
[0011] In some modified embodiments of the present application, the multi-stage biochemical treatment tank further includes: an MBR tank. The outlet of the second aerobic tank is connected to the inlet of the MBR tank through a pipeline, and the outlet of the MBR tank is connected to the inlet of the ultrafiltration membrane device through a pipeline.
[0012] In some modified embodiments of the present application, the amount of the concentrated water and the backwash water introduced into the advanced oxidation tank is more than the amount introduced into the second anoxic tank.
[0013] In some modified embodiments of the present application, the carbon source addition substance of the sewage biochemical unit is methanol and is added only to the second anoxic tank.
[0014] In some modified embodiments of the present application, it further includes:
[0015] A sewage regulating tank for storing sewage and connected to the inlet of the sewage biochemical unit.
[0016] In some modified embodiments of the present application, the volume of the sewage regulating tank is at least 5 times the hourly sewage inflow.
[0017] In some modified embodiments of the present application, a detection instrument is provided at the water outlet of the advanced oxidation tank.
[0018] In some modified embodiments of the present application, the advanced oxidation tank is an ozone catalytic oxidation tank.
[0019] In some modified embodiments of the present application, the sewage at least includes coal gasification sewage and circulating water blowdown.
[0020] Compared with the prior art, for the sewage treatment system provided by the present application, the sewage biochemical unit includes a multi-stage biochemical treatment tank connected in sequence, which can deepen the treatment process step by step, effectively cope with the complex organic and inorganic components in the coal gasification sewage, and can significantly improve the removal rate and removal effect of pollutants through gradual degradation and transformation; the reclaimed water reuse unit includes an ultrafiltration membrane device and a reverse osmosis membrane device connected in sequence, and can meet the preparation standard of high-purity water after treatment, so that the purified water can meet the use requirements of the circulating water system and realize the recycling of sewage. By introducing part of the concentrated water and backwash water discharged from the ultrafiltration membrane device and the reverse osmosis membrane device into the sewage biochemical unit as a carbon source, the carbon source dosage in the sewage biochemical unit can be reduced; the remaining part of the concentrated water and backwash water is introduced into the advanced oxidation tank of the advanced oxidation unit, which can effectively remove pollutants such as organic matter and microorganisms in the sewage and meet the requirements for external discharge. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] By referring to the following detailed description of the drawings, the above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understandable. In the drawings, several embodiments of the present application are shown in an exemplary rather than a restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:
[0022] Figure 1 Schematically shows a schematic diagram of the sewage treatment system provided by an embodiment of the present utility model;
[0023] DESCRIPTION OF THE REFERENCE NUMERALS IN THE DRAWINGS:
[0024] 1. Sewage biochemical unit; 11. First-stage anoxic tank; 12. First-stage aerobic tank; 13. Second-stage anoxic tank; 14. Second-stage aerobic tank; 15. MBR tank;
[0025] 2. Reclaimed water reuse unit; 21. Ultrafiltration membrane device; 22. Reverse osmosis membrane device;
[0026] 3. Advanced oxidation unit; 31. Advanced oxidation tank;
[0027] 4. Sewage regulation tank. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0028] The following will describe the exemplary embodiments of the present disclosure in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.
[0029] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application shall have the ordinary meanings understood by those skilled in the art to which this application pertains.
[0030] Embodiment
[0031] Reference appendix Figure 1 , an embodiment of the present utility model provides a sewage treatment system, which includes: a sewage biochemical unit 1, a reclaimed water reuse unit 2, and an advanced oxidation unit 3 connected in sequence; the sewage biochemical unit 1 includes a multi-stage biochemical treatment pool connected in sequence; the reclaimed water reuse unit 2 includes an ultrafiltration membrane device 21 and a reverse osmosis membrane device 22 connected in sequence, the outlet of the sewage biochemical unit 1 is connected to the inlet of the ultrafiltration membrane device 21 through a pipeline, the reverse osmosis water production outlet of the reverse osmosis membrane device 22 is connected to a circulating water system, and part of the concentrated water and backwash water discharged from the ultrafiltration membrane device 21 and the reverse osmosis membrane device 22 is introduced into the sewage biochemical unit 1 as a carbon source; the advanced oxidation unit 3 includes an advanced oxidation pool 31, and the remaining part of the concentrated water and the backwash water is introduced into the advanced oxidation pool 31 for discharge after treatment.
[0032] Specifically, the sewage treatment system provided in this embodiment can, but is not limited to, treat the wastewater generated by a coal gasification chemical plant. For example, the sewage can include coal gasification sewage and circulating water blowdown sewage. The sewage generated by a coal chemical plant has complex components, high chemical oxygen demand (COD) and total nitrogen, and is difficult to treat. The BOD5 / TN < 1 (BOD5: five-day biochemical oxygen demand), and the carbon-nitrogen ratio in the water is seriously imbalanced. Since the sewage TN is relatively high, about 250 mg / L, it needs to be reduced to less than 15 mg / L, and the removal rate reaches more than 94%. The treatment difficulty is relatively large. Therefore, in the technical solution adopted by the present utility model, the sewage treatment system includes: a sewage biochemical unit 1, a reclaimed water reuse unit 2, and an advanced oxidation unit 3 connected in sequence. The sewage biochemical unit 1 includes a multi-stage biochemical treatment pool connected in sequence, which can deepen the treatment process step by step, effectively deal with the complex organic and inorganic components in the coal gasification sewage, and can significantly improve the pollutant removal rate and removal effect through gradual degradation and transformation. Among them, the multi-stage biochemical treatment pool can specifically refer to setting a multi-stage A / O process (anoxic-aerobic process) and / or can also refer to setting multiple treatment stages of primary, intermediate, and advanced levels to ensure that the treated sewage meets the standards and requirements. In order to realize the reuse of the treated sewage, the reclaimed water reuse unit 2 includes an ultrafiltration membrane device 21 and a reverse osmosis membrane device 22 connected in sequence. The outlet of the sewage biochemical unit 1 is connected to the inlet of the ultrafiltration membrane device 21 through a pipeline, and the reverse osmosis water outlet of the reverse osmosis membrane device 22 is connected to the circulating water system. The ultrafiltration membrane device 21 adopts the screening principle and uses pressure as the driving force to effectively remove particles, colloids, bacterial mats, and high-molecular organic substances in the water purified by the sewage biochemical unit 1 through its microporous structure (pore size range is 0.005 - 0.01 μm). After the water is treated by the ultrafiltration membrane device 21, it enters the reverse osmosis device. The reverse osmosis device uses a reverse osmosis membrane with an extremely small pore size (pore size is about 1 / 10000 μm), and by pressurizing, water molecules can pass through the membrane while retaining charged ions, inorganic substances, colloidal particles, bacteria, and organic substances in the water, and can reach the preparation standard of high-purity water, so that the purified water can meet the usage requirements of the circulating water system and realize the recycling and reuse of sewage.
[0033] The ultrafiltration membrane device 21 and the reverse osmosis membrane device 22 will produce concentrated water due to the selective filtration of the membrane. After taking cleaning measures to maintain the normal operation of the membrane and extend its service life, backwash water will be generated. Due to its highly polluted characteristics, the sewage and backwash water cannot be directly discharged. In the technical solution adopted by the present utility model, part of the concentrated water and backwash water discharged from the ultrafiltration membrane device 21 and the reverse osmosis membrane device 22 is introduced into the sewage biochemical unit 1 as a carbon source. The carbon source of the sewage biochemical unit 1 can enhance the efficiency and effect of sewage treatment through multiple functions such as providing energy for microorganisms, promoting the growth and reproduction of microorganisms, improving the effluent quality, regulating the microbial community structure, and promoting sludge stabilization. By reusing the sewage and backwash water, the carbon source dosage in the sewage biochemical unit 1 can be reduced; the remaining part of the concentrated water and the backwash water is introduced into the advanced oxidation pool 31 of the advanced oxidation unit 3. The advanced oxidation pool 31 can specifically be an ozone catalytic oxidation pool, but is not limited thereto. The advanced oxidation technology can rapidly and non-selectively oxidize and decompose organic pollutants in water by generating strongly oxidizing free radicals, and even mineralize them into harmless substances such as carbon dioxide and water. Introducing the concentrated water and backwash water into the advanced oxidation pool 31 for treatment can make full use of the strong oxidizing and non-selective characteristics of the advanced oxidation technology to effectively remove pollutants such as organic matter and microorganisms in the sewage, and it can be discharged after treatment.
[0034] It should be noted that the concentrated water and backwash water can be used as the carbon source supplemented in the sewage treatment process of the sewage biochemical unit 1. However, attention should be paid to the impact of the complexity of their components and properties on the water quality. Therefore, a small part of the concentrated water and backwash water is introduced into the sewage biochemical unit 1 as a carbon source, while most of the concentrated water and backwash water is introduced into the advanced oxidation pool 31 for purification and then discharged.
[0035] According to the above, the embodiment of the present utility model provides a sewage treatment system. The sewage biochemical unit 1 includes a multi-stage biochemical treatment pool connected in sequence, which can gradually deepen the treatment process and effectively deal with the complex organic and inorganic components in the coal gasification sewage. Through gradual degradation and transformation, the removal rate and effect of pollutants can be significantly improved; the reclaimed water reuse unit 2 includes an ultrafiltration membrane device 21 and a reverse osmosis membrane device 22 connected in sequence, and after treatment, it can meet the preparation standard of high-purity water, so that the purified water can meet the use requirements of the circulating water system and realize the recycling and reuse of sewage. By introducing part of the concentrated water and backwash water discharged from the ultrafiltration membrane device 21 and the reverse osmosis membrane device 22 into the sewage biochemical unit 1 as a carbon source, the carbon source dosage in the sewage biochemical unit 1 can be reduced; the remaining part of the concentrated water and backwash water is introduced into the advanced oxidation pool 31 of the advanced oxidation unit 3, which can effectively remove pollutants such as organic matter and microorganisms in the sewage and meet the requirements for external discharge.
[0036] Further, referring to the appendix Figure 1, in a specific implementation, the multi-stage biochemical treatment tank includes: a first-stage anoxic tank 11, a first-stage aerobic tank 12, a second-stage anoxic tank 13, and a second-stage aerobic tank 14 connected in sequence. A part of the concentrated water and the backwash water is introduced into the second-stage anoxic tank 13 as a carbon source.
[0037] Specifically, since the sewage generated by coal chemical plants has complex components and is difficult to treat, in the technical solution adopted by the present utility model, a two-stage A / O process is used. The multi-stage biochemical treatment tank includes: a first-stage anoxic tank 11, a first-stage aerobic tank 12, a second-stage anoxic tank 13, and a second-stage aerobic tank 14 connected in sequence. In the two-stage A / O process, the series design of the anoxic tank and the aerobic tank enables organic matter to be initially hydrolyzed into small-molecule organic matter under anoxic conditions and then completely oxidized and decomposed under aerobic conditions. This process not only improves the biodegradability of the wastewater but also significantly reduces the organic matter content in the wastewater, including carbon source substances, and has multiple advantages such as high efficiency, stability, and economy for removing carbon and nitrogen in the wastewater. It can not only effectively reduce the organic matter and nitrogen content in the wastewater but also reduce the operating cost while ensuring the treatment effect. It should be noted that the coal gasification sewage and circulating water blowdown introduced into the system can provide a carbon source for the first-stage anoxic tank 11. Therefore, the carbon source addition substance of the sewage biochemical unit 1 can be set as methanol and added only to the second-stage anoxic tank 13. A part of the concentrated water and the backwash water is introduced into the second-stage anoxic tank 13 as a carbon source to reduce the amount of carbon source addition.
[0038] Further, referring to the appendix Figure 1 , in a specific implementation, the multi-stage biochemical treatment tank further includes: an MBR tank 15. The outlet of the second-stage aerobic tank 14 is connected to the inlet of the MBR tank 15 through a pipeline, and the outlet of the MBR tank 15 is connected to the inlet of the ultrafiltration membrane device 21 through a pipeline.
[0039] Specifically, since the sewage generated by coal chemical plants has complex components and is difficult to treat, in the technical solution adopted by the present utility model, the sewage biochemical unit 1 adopts a treatment method of two-stage A / O process + MBR, combining the advantages of sublimation treatment and membrane technology. The MBR (Membrane Bioreactor) tank is a high-efficiency sewage treatment technology that combines membrane separation technology with traditional biological treatment processes. The MBR tank 15 separates the activated sludge in the biological reactor from the treated water through membrane components such as ultrafiltration membranes or microfiltration membranes, thus realizing the efficient separation of mud and water and the deep purification of sewage. The sewage purification method of two-stage A / O process + MBR tank 15 not only improves the treatment efficiency and water quality standard of the wastewater but also enhances the stability and reliability of the system. At the same time, this method also has certain energy-saving and environmental protection properties, reducing the energy consumption and floor area in traditional processes and effectively preventing secondary pollution to the environment.
[0040] Further, referring to the appendixFigure 1 , in a specific implementation, the sewage treatment system provided in this embodiment further includes: a sewage regulating tank 4 for storing sewage and connected to the inlet of the sewage biochemical unit 1.
[0041] Specifically, in order to provide stable working conditions for the sewage biochemical unit 1, in the technical solution adopted by the present utility model, a sewage regulating tank 4 is provided to store sewage and introduce the sewage into the inlet of the sewage biochemical unit 1. Such a design enables the coal gasification sewage and the recycled water sewage to preferentially enter the sewage regulating tank 4. The volume of the sewage regulating tank 4 can be set to at least 5 times the hourly sewage inflow. Through its sufficient volume, it can cope with the sometimes increasing and sometimes decreasing sewage load, making the water quality and quantity of the sewage entering the biochemical unit relatively stable, providing stable operating conditions for the subsequent biological treatment process, and helping to improve the effect and efficiency of biochemical treatment; in addition, a pretreatment structure can be set in the sewage regulating tank 4 to remove large particulate matter, suspended solids and some sediments in the sewage, so as to reduce the burden on the subsequent biochemical unit and improve the overall treatment efficiency.
[0042] Further, in a specific implementation, a detection instrument (not shown in the figure) is provided at the water outlet of the advanced oxidation tank 31.
[0043] Specifically, in order to accurately adjust the ozone dosage in the advanced oxidation tank 31, in the technical solution adopted by the present utility model, a detection instrument can be provided at the water outlet of the advanced oxidation tank 31. The detection instrument here is not limited to at least one of an online COD (chemical oxygen demand) monitor, an online ORP (oxidation-reduction potential) monitor, and other water quality parameter monitors. The detection instrument can monitor the water quality parameters at the water outlet of the advanced oxidation tank 31 in real time, and the obtained indicators can include but are not limited to key water quality indicators such as COD value and ORP value. These indicators provide a scientific basis for dynamically adjusting the ozone dosage to ensure that the treated water quality meets the predetermined standard.
[0044] The following takes a specific example to illustrate the technical effect of applying the sewage treatment system: The wastewater of a certain coal chemical plant has a COD of 395 mg / L, a BOD5 of 156, a total nitrogen of 251 mg / L, an ammonia nitrogen of 198 mg / L, and an influent volume of 200 m3 / h. After 120 m3 / h is treated and recycled by the intermediate water reuse unit 2, the COD of the effluent after treatment by the advanced oxidation tank 31 is 38 mg / L, the total nitrogen is 19 mg / L, and the ammonia nitrogen is 4 mg / L. See Table 1 for details.
[0045] Table 1 Inlet and outlet indexes at each stage
[0046]
[0047]
[0048] It should be noted that in the description of this specification, the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention; terms such as "connection", "installation", and "fixation" should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0049] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", and "specific embodiments" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0050] As mentioned above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims
1. A sewage treatment system, characterized in that, Comprising: A sewage biochemical unit, a reclaimed water reuse unit, and an advanced oxidation unit connected in sequence; The sewage biochemical unit includes a multi-stage biochemical treatment tank connected in sequence; The reclaimed water reuse unit includes an ultrafiltration membrane device and a reverse osmosis membrane device connected in sequence. The outlet of the sewage biochemical unit is connected to the inlet of the ultrafiltration membrane device through a pipeline. The reverse osmosis water production outlet of the reverse osmosis membrane device is connected to a circulating water system. Part of the concentrated water and backwash water discharged from the ultrafiltration membrane device and the reverse osmosis membrane device is introduced into the sewage biochemical unit as a carbon source; The advanced oxidation unit includes an advanced oxidation tank. The remaining part of the concentrated water and the backwash water is introduced into the advanced oxidation tank for discharge after treatment.
2. The sewage treatment system according to claim 1, wherein The multi-stage biochemical treatment tank includes: a first-stage anoxic tank, a first-stage aerobic tank, a second-stage anoxic tank, and a second-stage aerobic tank connected in sequence. Part of the concentrated water and the backwash water is introduced into the second-stage anoxic tank as a carbon source.
3. The sewage treatment system according to claim 2, wherein The multi-stage biochemical treatment tank further includes: an MBR tank. The outlet of the second-stage aerobic tank is connected to the inlet of the MBR tank through a pipeline. The outlet of the MBR tank is connected to the inlet of the ultrafiltration membrane device through a pipeline.
4. The sewage treatment system according to claim 2, wherein The amount of the concentrated water and the backwash water introduced into the advanced oxidation tank is more than the amount introduced into the second-stage anoxic tank.
5. The sewage treatment system according to claim 2 or 4, wherein The carbon source addition substance of the sewage biochemical unit is methanol and is added only in the second-stage anoxic tank.
6. The sewage treatment system according to claim 1, wherein Further comprising: A sewage regulation tank for storing sewage and connected to the inlet of the sewage biochemical unit.
7. The sewage treatment system according to claim 6, wherein The volume of the sewage regulation tank is at least 5 times the hourly sewage inflow.
8. The sewage treatment system according to claim 1, wherein A detection instrument is provided at the water production outlet of the advanced oxidation tank.
9. The sewage treatment system according to claim 1 or 8, wherein The advanced oxidation tank is an ozone catalytic oxidation tank.
10. The sewage treatment system according to claim 1, wherein The sewage at least includes coal gasification sewage and circulating water blowdown.