MDEA wastewater treatment system
By combining a treatment system including equalization tank, solid-liquid separation, reverse osmosis and ozone catalytic oxidation, the problem of high organic content in MDEA wastewater was solved, and the wastewater was purified and reused.
Patent Information
- Application Number
- CN202423318564.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2034-12-31
AI Technical Summary
MDEA wastewater has a high organic content, which is difficult to biodegrade, and existing technologies are unable to treat it effectively.
The system employs a combination of equalization tank, solid-liquid separation device, reverse osmosis device, ozone catalytic oxidation device, and aerated biological filter device to achieve wastewater reuse through homogenization, suspended solids removal, concentration, organic matter degradation, and deep purification.
It effectively removes suspended solids and organic matter from wastewater, improves biodegradability, meets emission standards, and enables wastewater reuse.
Smart Images
Figure CN223823461U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a treatment system for MDEA wastewater. Background Technology
[0002] Refinery gas is a byproduct of petroleum refining and needs to be effectively utilized for environmental protection and maximum energy efficiency. However, because refinery gas contains H2S, it can adversely affect subsequent transportation pipelines, process equipment, and human health. Therefore, whether used as feedstock or fuel gas, it must undergo desulfurization treatment before resource utilization. Among current gas desulfurization methods, amine solvent desulfurization is widely used, with N-methyldiethanolamine (MDEA) being widely applied due to its strong absorption capacity, low energy consumption, and weak degradation and corrosiveness. During desulfurization, MDEA is repeatedly absorbed and desorbed. In this process, the amine solution undergoes thermal and chemical degradation, and newly generated substances also enter the wastewater along with some MDEA. During shutdown and maintenance, various organic substances and attached amine solvents from the equipment also enter the wastewater. This type of wastewater has a high organic content and is difficult to biodegrade, necessitating the development of a suitable purification technology.
[0003] In view of the above, this utility model is hereby proposed. Utility Model Content
[0004] One of the objectives of this invention is to provide a treatment system for MDEA wastewater, so as to at least solve one of the technical problems in the prior art: high organic content in wastewater, which is difficult to biodegrade.
[0005] In order to achieve the above-mentioned objectives of this utility model, the following technical solution is adopted:
[0006] This utility model provides a treatment system for MDEA wastewater, comprising an equalization tank, a high-density device, a solid-liquid separation device, a first-stage reverse osmosis device, a second-stage reverse osmosis device, an ozone catalytic oxidation device, and an aerated biological filter device connected in sequence.
[0007] The equalization tank is used for the homogenization treatment of wastewater;
[0008] The high-density device is used to remove suspended solids from wastewater;
[0009] The solid-liquid separation device is used to remove small and large suspended particles;
[0010] The primary reverse osmosis unit is used to concentrate wastewater;
[0011] The secondary reverse osmosis unit is used to produce reusable permeable water;
[0012] The ozone catalytic oxidation device and the aerated biological filter device work together to remove residual biodegradable organic matter from wastewater.
[0013] Furthermore, the solid-liquid separation device includes a sand filtration device and an ultrafiltration device;
[0014] The sand filter device is used to remove large particulate suspended solids from wastewater.
[0015] The ultrafiltration device is used to remove small particulate suspended solids from wastewater.
[0016] Furthermore, the filling material in the sand filter device includes quartz sand.
[0017] Furthermore, the ultrafiltration device is a tubular ultrafiltration device;
[0018] The filter membrane has a molecular weight interception capacity of 10,000 Da.
[0019] Furthermore, the concentrate outlet of the secondary reverse osmosis unit is connected to the inlet of the primary reverse osmosis unit.
[0020] Furthermore, the primary reverse osmosis unit includes a first-stage reverse osmosis unit and a second-stage reverse osmosis unit;
[0021] The inlet of the first-stage reverse osmosis unit is connected to the product water outlet of the ultrafiltration unit and the concentrate outlet of the second-stage reverse osmosis unit, respectively, and the concentrate outlet of the first-stage reverse osmosis unit is connected to the inlet of the second-stage reverse osmosis unit.
[0022] The concentrate outlet of the second-stage reverse osmosis unit is connected to the inlet of the ozone catalytic oxidation unit.
[0023] Furthermore, the reverse osmosis membranes in the first-stage reverse osmosis unit, the second-stage reverse osmosis unit, and the second-stage reverse osmosis unit are all bitter membranes.
[0024] Furthermore, the high-density device is equipped with a dosing port for adding flocculants and coagulants.
[0025] Furthermore, the catalyst in the ozone catalytic oxidation device is Al2O3;
[0026] The filter media filled in the aerated biological filter device is ceramsite.
[0027] Furthermore, it also includes plate and frame devices;
[0028] The inlet of the plate and frame device is connected to the sludge inlet of the high-density device, the backwash inlet of the sand filter device, and the backwash inlet of the ultrafiltration device, respectively.
[0029] The filter press port of the plate and frame device is connected to the inlet of the equalization tank.
[0030] This invention provides a wastewater treatment system for MDEA (Metallic Acid Effluent in the Formulation) wastewater. The system collects and homogenizes MDEA wastewater in an equalization tank, stabilizing the water quality discharged from the equalization tank. A high-density filter removes suspended solids from the wastewater, preventing membrane fouling. A solid-liquid separation device removes both small and large suspended solids. A primary reverse osmosis unit concentrates and reduces the volume of wastewater, decreasing the treatment capacity of the ozone catalytic oxidation unit and the aerated biological filter, thus reducing equipment investment costs. The ozone catalytic oxidation unit removes small-molecule organic matter and degrades large-molecule organic matter into smaller molecules, improving the biodegradability of the wastewater and facilitating the operation of the subsequent aerated biological filter. The aerated biological filter removes residual COD from the wastewater, achieving compliance with discharge standards. A secondary reverse osmosis unit further purifies the permeate from the primary reverse osmosis unit, allowing for wastewater reuse. Attached Figure Description
[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0032] Figure 1 This is a schematic diagram of the connection structure of an MDEA wastewater treatment system provided for an embodiment of this utility model.
[0033] Icons: 1-Equalization tank; 2-High-density device; 3-Sand filter device; 4-Ultrafiltration device; 5-First-stage reverse osmosis device; 6-Second-stage reverse osmosis device; 7-Ozone catalytic oxidation device; 8-Aerated biological filter device; 9-Second-stage reverse osmosis device; 10-Plate and frame filter device. Detailed Implementation
[0034] Unless otherwise defined herein, the scientific and technical terms used in connection with this utility model shall have the meanings commonly understood by one of ordinary skill in the art. The meaning and scope of terms shall be clear; however, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or foreign definitions. In this application, unless otherwise stated, the use of "or" means "and / or". Furthermore, the use of the term "comprising" and other forms is non-limiting.
[0035] In the description of this utility model, it should be noted that the terms "proximal end," "distal end," "front end," "rear end," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0036] The terms "horizontal" and "vertical" do not imply that a component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0037] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0038] This utility model provides a treatment system for MDEA wastewater, including an equalization tank 1, a high-density device 2, a solid-liquid separation device, a first-stage reverse osmosis device, a second-stage reverse osmosis device 9, an ozone catalytic oxidation device 7, and an aerated biological filter device 8 connected in sequence.
[0039] The equalization tank 1 is used to homogenize the wastewater; the high-density device 2 is used to remove suspended solids from the wastewater; the solid-liquid separation device is used to remove small and large suspended particles; the first-stage reverse osmosis device is used to concentrate the wastewater; the ozone catalytic oxidation device 7 and the aerated biological filter device 8 work together to remove the remaining biodegradable organic matter from the wastewater; the second-stage reverse osmosis device 9 is used to further purify the water produced by the first-stage reverse osmosis device.
[0040] MDEA wastewater is collected and homogenized in equalization tank 1 to stabilize the water quality of the wastewater discharged from the equalization tank. Suspended solids in the wastewater are removed by high-density equipment 2 to prevent membrane fouling. Small and large suspended solids are removed by solid-liquid separation equipment. The wastewater is concentrated and reduced in volume by a primary reverse osmosis unit, reducing the treatment capacity of the ozone catalytic oxidation unit 7 and the aerated biological filter unit 8, thus reducing equipment investment costs. The ozone catalytic oxidation unit removes small-molecule organic matter from the wastewater and degrades large-molecule organic matter into smaller molecules, improving the biodegradability of the wastewater and facilitating the operation of the subsequent aerated biological filter unit 8. The aerated biological filter unit 8 removes residual COD from the wastewater to meet discharge standards. The secondary reverse osmosis unit 9 further purifies the permeate from the primary reverse osmosis unit, and the permeate from the secondary reverse osmosis unit 9 can be reused, achieving the goal of wastewater reuse.
[0041] In some specific embodiments, the solid-liquid separation device includes a sand filter 3 and an ultrafiltration device 4; the sand filter 3 is used to remove large particulate suspended solids from the wastewater; and the ultrafiltration device 4 is used to remove small particulate suspended solids from the wastewater.
[0042] The sand filter device 3 is filled with quartz sand; the ultrafiltration device is a tubular ultrafiltration device with a membrane that can intercept molecular weights of 10,000 Da and a recovery rate of 90%.
[0043] In some specific embodiments, the concentrate outlet of the secondary reverse osmosis unit 9 is connected to the inlet of the primary reverse osmosis unit.
[0044] Through the advanced treatment of the secondary reverse osmosis unit 9, organic matter in the permeate water of the primary reverse osmosis unit is further removed, so as to meet the standards for reused water.
[0045] In some specific embodiments, the first-stage reverse osmosis unit includes a first-stage reverse osmosis unit 5 and a second-stage reverse osmosis unit 6;
[0046] The inlet of the first-stage reverse osmosis unit 5 is connected to the product water outlet of the ultrafiltration unit and the concentrate outlet of the second-stage reverse osmosis unit, respectively, and the concentrate outlet of the first-stage reverse osmosis unit 5 is connected to the inlet of the second-stage reverse osmosis unit 6.
[0047] The concentrate outlet of the second-stage reverse osmosis unit 6 is connected to the inlet of the ozone catalytic oxidation unit 7.
[0048] In some specific embodiments, the reverse osmosis membranes in the first-stage reverse osmosis unit 5, the second-stage reverse osmosis unit 6, and the second-stage reverse osmosis unit 9 are all bitter membranes.
[0049] Specifically, the bitter membrane in the first-stage reverse osmosis unit 5 has a recovery rate of 75%, a pressure of 10-15 bar, and an average permeate membrane flux of 18-20 LMH; the bitter membrane in the second-stage reverse osmosis unit 6 has a recovery rate of 70%, a pressure of 20-25 bar, and an average permeate membrane flux of 16-18 LMH; and the bitter membrane in the second-stage reverse osmosis unit 9 has a recovery rate of 85%, a pressure of 5-10 bar, and an average permeate membrane flux of 20-25 LMH.
[0050] In some specific embodiments, the high-density device is provided with a dosing port for adding flocculants and coagulants.
[0051] Specifically, the flocculant is PAC, the coagulant aid is PAM, the PAC dosage is 500 ppm, the PAM dosage is 3 ppm, and the PAM is anionic PAM.
[0052] In some specific embodiments, the catalyst in the ozone catalytic oxidation device 7 is Al2O3;
[0053] The filter media filled in the aerated biological filter device 8 is ceramsite. It can perform biochemical treatment to remove organic matter, and the effluent meets the discharge standards.
[0054] In some specific embodiments, a plate and frame device 10 is also included;
[0055] The inlet of the plate and frame filter 10 is connected to the sludge inlet of the high-density filter 2, the backwash inlet of the sand filter 3, and the backwash inlet of the ultrafiltration device 4, respectively; the filter press outlet of the plate and frame filter 10 is connected to the inlet of the equalization tank 1. This enables the sludge to be transported and treated externally.
[0056] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0057] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0058] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0059] Example 1
[0060] Combination Figure 1 The following describes a treatment system for MDEA wastewater, comprising, in sequence, an equalization tank 1, a high-density unit 2, a solid-liquid separation unit, a primary reverse osmosis unit, a secondary reverse osmosis unit 9, an ozone catalytic oxidation unit 7, and an aerated biological filter unit 8. The ozone dosage in the ozone catalytic oxidation unit 7 is 150 mg / L, and the catalyst is Al2O3; the filter media packed in the aerated biological filter unit 8 (BAF unit) is ceramsite.
[0061] The separation device includes a sand filter 3 and an ultrafiltration device 4. The sand filter 3 is filled with quartz sand with a particle size of 0.75-1.2 mm and has a recovery rate of 99%. The ultrafiltration device is a tubular ultrafiltration device with a filter membrane that can intercept molecular weights of 10,000 Da and has a recovery rate of 90%.
[0062] The primary reverse osmosis unit includes a primary reverse osmosis unit 5 and a secondary reverse osmosis unit 6. The inlet of the primary reverse osmosis unit 5 is connected to the product water outlet of the ultrafiltration unit and the concentrate outlet of the secondary reverse osmosis unit 9, respectively. The concentrate outlet of the primary reverse osmosis unit 5 is connected to the inlet of the secondary reverse osmosis unit 6. The concentrate outlet of the secondary reverse osmosis unit 6 is connected to the inlet of the ozone catalytic oxidation unit 7.
[0063] The concentrate outlet of the secondary reverse osmosis unit 9 is connected to the inlet of the primary reverse osmosis unit 5.
[0064] The bitter membrane in the first-stage reverse osmosis unit 5 has a recovery rate of 75%, a pressure of 10-15 bar, and an average permeate membrane flux of 18-20 LMH; the bitter membrane in the second-stage reverse osmosis unit 6 has a recovery rate of 70%, a pressure of 20-25 bar, and an average permeate membrane flux of 16-18 LMH; the bitter membrane in the second-stage reverse osmosis unit 9 has a recovery rate of 85%, a pressure of 5-10 bar, and an average permeate membrane flux of 20-25 LMH.
[0065] The high-density equipment is equipped with dosing ports for adding flocculants and coagulants. The flocculant is PAC, and the coagulant is PAM. The PAC dosage concentration is 500 ppm, and the PAM dosage concentration is 3 ppm. The PAM is anionic PAM.
[0066] The inlet of the plate and frame device 10 is connected to the sludge inlet of the high-density device 2, the backwash inlet of the sand filter device 3, and the backwash inlet of the ultrafiltration device 4, respectively; the filter press inlet of the plate and frame device 10 is connected to the inlet of the equalization tank 1.
[0067] Working principle:
[0068] MDEA wastewater enters equalization tank 1 and is homogenized before entering high-density unit 2 through the product outlet. In high-density unit 2, physical and chemical treatment is carried out, and flocculant PAC and coagulant aid PAM are added to remove suspended solids in the wastewater. Bottom sludge enters plate and frame filter press 10 for treatment. The filter cake is dried and transported off-site for treatment, and the filtrate is returned to equalization tank 1.
[0069] The wastewater treated by the high-density device 2 enters the sand filter device 3 through the product water outlet to remove large suspended solids in the influent. The wastewater treated by the sand filter device 3 enters the ultrafiltration device 4 through the product water outlet, while the backwash water enters the plate and frame device 10. The wastewater entering the ultrafiltration device 4 is treated to remove small suspended solids and then enters the first-stage reverse osmosis device 5 through the product water outlet, while the backwash water enters the plate and frame device 10.
[0070] The concentrate from the first-stage reverse osmosis unit 5 continues to enter the second-stage reverse osmosis unit 6 for further concentration; while the permeate from the first-stage reverse osmosis unit 5 and the second-stage reverse osmosis unit 6 respectively enter the second-stage reverse osmosis unit 9 for treatment. The permeate after treatment by the second-stage reverse osmosis unit 9 can be used as pure water for production, while the concentrate is returned to the first-stage reverse osmosis unit 5.
[0071] After being concentrated by the reverse osmosis unit 6 in the second stage, the wastewater enters the ozone catalytic oxidation unit 7 through the concentrate outlet. This directly degrades small-molecule organic matter in the wastewater into CO2 and H2O, and large-molecule organic matter into small-molecule organic matter, thereby improving the biodegradability of the wastewater.
[0072] The wastewater treated by the ozone catalytic oxidation device 7 enters the aerated biological filter device 8 through the outlet for biochemical treatment to remove organic matter, and the effluent can meet the discharge standards.
[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A treatment system for MDEA wastewater, characterized in that, It includes a regulating tank (1), a high-density device (2), a solid-liquid separation device, a first-stage reverse osmosis device, a second-stage reverse osmosis device (9), an ozone catalytic oxidation device (7), and an aerated biological filter device (8) connected in sequence. The equalization tank (1) is used to homogenize wastewater; The high-density device (2) is used to remove suspended solids from wastewater; The solid-liquid separation device is used to remove small and large suspended particles; The primary reverse osmosis unit is used to concentrate wastewater; The secondary reverse osmosis unit (9) is used to further purify the product water from the primary reverse osmosis unit; The ozone catalytic oxidation device (7) and the aerated biological filter device (8) work together to remove the remaining biodegradable organic matter in the wastewater.
2. The MDEA wastewater treatment system according to claim 1, characterized in that, The solid-liquid separation device includes a sand filter (3) and an ultrafiltration device (4); The sand filter device (3) is used to remove large particulate suspended solids from wastewater; The ultrafiltration device (4) is used to remove small particulate suspended solids from wastewater.
3. The MDEA wastewater treatment system according to claim 2, characterized in that, The filling material in the sand filter device (3) includes quartz sand.
4. The MDEA wastewater treatment system according to claim 2, characterized in that, The ultrafiltration device is a tubular ultrafiltration device; The filter membrane has a molecular weight interception capacity of 10,000 Da.
5. The MDEA wastewater treatment system according to claim 1, characterized in that, The concentrate outlet of the secondary reverse osmosis unit (9) is connected to the inlet of the primary reverse osmosis unit.
6. The MDEA wastewater treatment system according to claim 5, characterized in that, The primary reverse osmosis unit includes a first-stage reverse osmosis unit (5) and a second-stage reverse osmosis unit (6); The inlet of the first-stage reverse osmosis unit (5) is connected to the product water outlet of the ultrafiltration unit and the concentrate outlet of the second-stage reverse osmosis unit (9), respectively. The concentrate outlet of the first-stage reverse osmosis unit (5) is connected to the inlet of the second-stage reverse osmosis unit (6). The concentrate outlet of the two-stage reverse osmosis unit (6) is connected to the inlet of the ozone catalytic oxidation unit (7).
7. The MDEA wastewater treatment system according to claim 6, characterized in that, The reverse osmosis membranes in the first-stage reverse osmosis unit (5), the second-stage reverse osmosis unit (6), and the second-stage reverse osmosis unit (9) are all bitter membranes.
8. The MDEA wastewater treatment system according to claim 1, characterized in that, The high-density device is equipped with a dosing port for adding flocculants and coagulants.
9. The MDEA wastewater treatment system according to claim 1, characterized in that, The catalyst in the ozone catalytic oxidation device (7) is Al2O3; The filter material filled in the aerated biological filter device (8) is ceramsite.
10. The MDEA wastewater treatment system according to any one of claims 1-9, characterized in that, It also includes a plate and frame assembly (10); The inlet of the plate and frame device (10) is connected to the sludge inlet of the high-density device (2), the backwash inlet of the sand filter device (3), and the backwash inlet of the ultrafiltration device (4), respectively. The filter press port of the plate and frame device (10) is connected to the inlet of the regulating tank (1).