System for cooperatively treating sludge and sewage by using ferrous activated persulfate to assist MABR

Abstract

The utility model discloses a system for cooperatively treating sludge and sewage by using ferrous activated persulfate to assist an MABR, and belongs to the technical field of sludge and sewage treatment. According to the technical scheme, the device comprises a device body, a sludge and sewage pretreatment unit, a ferrous / persulfate feeding unit, an MABR sludge and sewage cooperation unit and a controller; the sludge and sewage pretreatment unit is arranged at the upper end of the device body, and the MABR sludge and sewage co-treatment unit is arranged at the lower end of the device body; the sludge and sewage pretreatment unit comprises a pretreatment tank, a stirring mechanism is arranged in the pretreatment tank and comprises a stirring shaft, stirring blades arranged on the periphery of the stirring shaft and a stirring motor, and the stirring shaft penetrates through the two ends of the pretreatment tank and is rotationally connected with the stirring motor. According to the utility model, the wastewater treatment efficiency can be improved, the generation of sludge is reduced, the operation cost is reduced, and better economic benefits and environmental benefits are achieved by utilizing a ferrous activated persulfate enhanced MABR technology.

Description

Technical Field

[0001] The utility model belongs to the technical field of sludge and sewage treatment, and particularly relates to a system for collaboratively treating sludge and sewage using a ferrous activated persulfate-assisted MABR. Background Art

[0002] As an environmentally friendly wastewater treatment technology, the MABR system offers significant energy savings compared to traditional activated sludge treatment, reducing energy consumption by 70%. Therefore, it is considered a promising alternative to traditional biological treatment processes. In a MABR system, oxygen diffuses through the inner wall of the breathable hollow fiber membrane into the biofilm attached to the outer surface of the membrane fibers. Simultaneously, soluble pollutants in the wastewater diffuse inward from the outer membrane, forming a unique layered biofilm structure. This hollow fiber membrane not only serves as a biological carrier but also provides the biofilm with essential oxygen.

[0003] Biological wastewater treatment primarily involves nitrification and denitrification, which remove nutrients and nitrogen. Traditional activated sludge, on the other hand, is a complex colloidal system composed primarily of highly dispersed flocs, typically containing over 99.5% water. Traditional sludge dewatering methods, including physical disruption and chemical addition, followed by treatment in centrifuges and filter presses, still produce conditioned sludge cakes with a moisture content between 75% and 85%, a major obstacle to sludge recovery.

[0004] In order to improve the dewatering performance of sludge, persulfate advanced oxidation technology is widely used. 2+ The reaction generates highly reactive SO4 - • and •OH, these free radicals can destroy EPS (extracellular polymers) and microbial cells in sludge, converting and releasing bound water in the sludge into free water, thereby achieving a sludge dewatering rate of up to 45%. EPS in sludge is a high-molecular-weight polymer secreted by microorganisms. It is composed of a mixture of organic compounds such as proteins, polysaccharides, lipids, humus, and DNA residues. It has a significant impact on the physical and chemical properties of activated sludge, such as flocculation, sludge surface charge, and sedimentation characteristics. However, most existing sludge treatment equipment is not suitable for treating both sewage and sludge, and the agitation mechanism cannot be cleaned during sludge agitation pretreatment. Utility Model Content

[0005] The utility model provides a system for assisted MABR to collaboratively treat sludge and sewage with ferrous activated persulfate. The MABR technology enhanced by ferrous activated persulfate can improve sewage treatment efficiency, reduce sludge generation, and lower operating costs, thus having good economic and environmental benefits.

[0006] The technical solution of the utility model is:

[0007] The system of ferrous activated persulfate assisted MABR synergistic treatment of sludge and sewage comprises a device body, a sludge and sewage pretreatment unit, a ferrous / persulfate delivery unit, a MABR sludge and sewage synergistic treatment unit and a controller; the sludge and sewage pretreatment unit is arranged at the upper end of the device body, and the MABR sludge and sewage synergistic treatment unit is arranged at the lower end of the device body; the sludge and sewage pretreatment unit comprises a pretreatment tank, a stirring mechanism is arranged in the pretreatment tank, the stirring mechanism comprises a stirring shaft, a stirring blade arranged on the periphery of the stirring shaft and a stirring motor, the stirring shaft passes through both ends of the pretreatment tank and is rotatably connected to the stirring motor; the stirring motor is electrically connected to the controller, a mud and water outlet pipe is arranged at the bottom of the pretreatment tank, and a water and mud inlet and a ferrous / persulfate delivery unit are arranged at the top of the pretreatment tank; a pH sensor and a dissolved oxygen sensor are arranged in the pretreatment tank, and the pH sensor and the dissolved oxygen sensor are both electrically connected to the controller; the ferrous / persulfate delivery unit comprises a ferrous / persulfate delivery port, and the ferrous / persulfate delivery port is provided with two branches, which are respectively connected to the water outlet and the water outlet. The MABR sludge and sewage collaborative treatment unit includes a MABR reaction tank and an aeration mechanism, a drainage and mud discharge port is provided at the bottom of the MABR reaction tank, a membrane assembly is provided in the MABR reaction tank, and the membrane assembly includes a plurality of hollow membrane fibers arranged in sequence, and each hollow membrane fiber is provided with a gas inlet at the head end and a gas inlet at the end. A gas outlet is provided, and the aeration mechanism includes an air inlet and an air outlet. One end of the air inlet is connected to an external air compressor, and the other end of the air inlet is connected to a plurality of air inlet pipes. The number of the air inlet pipes matches the number of the gas inlets, and the air inlet pipes are connected to the gas inlets accordingly. The end of the air outlet close to the MABR reaction tank is connected to a plurality of air outlet pipes. The number of the air outlet pipes matches the number of the gas outlets, and the air outlet pipes are connected to the gas outlets accordingly. The MABR sludge and sewage collaborative treatment unit also includes a water quality online monitoring mechanism, which is electrically connected to the controller.

[0008] Preferably, a sludge and sewage circulation device is also provided in the MABR reaction tank, and the sludge and sewage circulation device includes a magnetic circulation pump, an outlet pipe and an inlet pipe, one end of the outlet pipe is connected to the magnetic circulation pump, and the other end is placed in the MABR reaction tank, and one end of the inlet pipe is connected to the magnetic circulation pump, and the other end is placed in the MABR reaction tank.

[0009] Preferably, the stirring blade has a plate-like structure, and the plane on which it is located is parallel to the axis of the stirring shaft. One side of the stirring blade is hinged to the stirring shaft through a hinge, and the rotation axis of the hinge is parallel to the axis of the stirring shaft. A bidirectional torsion spring is provided between the stirring blade and the hinge. A scraper is detachably fixed to the inner wall of the pretreatment tank, and the scraper is arranged radially along the pretreatment tank. The scraper has a strip scraping blade arranged toward the stirring shaft, and the length direction of the scraping blade is parallel to the axis of the stirring shaft, and the stirring shaft can be rotated clockwise or counterclockwise so that the scraping blade can scrape off dirt on one side or the other side of the stirring blade.

[0010] Preferably, the membrane assembly is a breathable polyvinylidene fluoride (PVDF) hollow fiber membrane assembly, and the membrane assembly adopts a baffled arrangement.

[0011] Preferably, a mud distribution plate is further provided between the mud and water outlet pipe and the MABR reaction tank, a mud distribution inlet is provided at the upper end of the mud distribution plate, the mud distribution inlet is connected to the mud and water outlet pipe, and a plurality of through holes are distributed at the bottom end of the mud distribution plate.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The utility model realizes the simultaneous and efficient treatment of sludge and sewage through the organic combination of the ferrous activated persulfate pretreatment unit and the MABR sludge and sewage collaborative treatment unit, thereby improving the treatment efficiency and effluent water quality.

[0014] 2. The controller can adjust the amount of ferrous iron / persulfate added, the speed of the stirring mechanism and other parameters in real time according to the data from the pH sensor, dissolved oxygen sensor and water quality online monitoring mechanism, realize intelligent control and improve the stability and reliability of the treatment effect.

[0015] 3. By precisely controlling the amount of ferrous iron / persulfate added, resource waste and environmental pollution caused by excessive addition are avoided. Furthermore, MABR technology does not require an external carbon source, reducing operating costs and sludge generation, thus meeting energy conservation and environmental protection requirements.

[0016] 4. The sludge-wastewater circulation device can increase the residence time and contact area of ​​sludge-wastewater in the MABR reaction tank, thereby improving the biodegradation efficiency and pollutant removal rate; prevent sludge deposition: through circulation flow, it can prevent sludge from depositing at the bottom of the reaction tank, keeping the reaction tank clean and operating efficiently.

[0017] 5. The stirring shaft in the stirring device has a plate-like structure. The stirring blades are hinged and equipped with bidirectional torsion springs, which can adaptively adjust their angles during the stirring process, thereby enhancing the stirring effect and improving the mixing uniformity of sludge and sewage. By rotating the stirring shaft clockwise or counterclockwise, the scraper can scrape off dirt on the stirring blades, realizing a self-cleaning function and extending the service life of the stirring mechanism.

[0018] 6. Breathable polyvinylidene fluoride (PVDF) hollow fiber membrane modules offer excellent air permeability and durability, adapting to the harsh environment of sludge and sewage, improving treatment efficiency and extending the service life of the membrane modules. The membrane modules utilize a baffled arrangement, which optimizes fluid distribution within the modules, increasing the contact area and contact time between the fluid and the membrane, thereby improving pollutant removal rates.

[0019] 7. The sludge distribution plate can evenly distribute the sludge in the sludge and water outlet pipes into the MABR reaction tank, avoiding local accumulation and excessive concentration of sludge, and improving biodegradation efficiency and effluent water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the present utility model.

[0021] Figure 2 It is a schematic diagram of the stirring mechanism of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the mud distribution board of the utility model.

[0023] Figure 4 It is a schematic diagram of the mechanism of the sludge and sewage circulation device of the utility model.

[0024] In the figure, 1. device body; 2. pretreatment tank; 3. stirring shaft; 4. stirring blade; 5. stirring motor; 6. mud and water outlet pipe; 7. water and mud inlet; 8. ferrous / persulfate inlet; 9. MABR reaction tank; 10. drainage and mud outlet; 11. membrane assembly; 12. gas inlet; 13. gas outlet; 14. air inlet; 15. air outlet; 16. air inlet pipe; 17. air outlet pipe; 18. water quality online monitoring mechanism; 19. hinged part; 20. scraper; 21. mud distribution plate; 22. through hole; 23. magnetic circulation pump; 24. water outlet pipe; 25. water inlet pipe. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0026] Example 1

[0027] like Figure 1-4As shown, the system for ferrous activated persulfate assisted MABR to collaboratively treat sludge and sewage includes a device body 1, a sludge and sewage pretreatment unit, a ferrous / persulfate dosing unit, a MABR sludge and sewage collaborative treatment unit and a controller;

[0028] The sludge and sewage pretreatment unit is arranged at the upper end of the device body 1, and the MABR sludge and sewage coordinated treatment unit is arranged at the lower end of the device body 1;

[0029] The sludge and sewage pretreatment unit includes a pretreatment tank 2, which is provided with a stirring mechanism. The stirring mechanism includes a stirring shaft 3, a stirring blade 4 arranged on the periphery of the stirring shaft 3, and a stirring motor 5. The stirring shaft 3 passes through both ends of the pretreatment tank 2 and is rotatably connected to the stirring motor 5; the stirring motor 5 is electrically connected to the controller, and a mud and water outlet pipe 6 is provided at the bottom of the pretreatment tank 2. A mud distribution plate 21 is also provided between the mud and water outlet pipe 6 and the MABR reaction tank 9. A mud distribution inlet is provided at the upper end of the mud distribution plate 21, and the mud distribution inlet is connected to the mud and water outlet pipe 6. The bottom end of the mud distribution plate is evenly distributed with a number of through holes 22.

[0030] The top of the pretreatment tank 2 is provided with a water and mud inlet 7 and a ferrous iron / persulfate delivery unit; a pH sensor and a dissolved oxygen sensor are provided in the pretreatment tank 2, and the pH sensor and the dissolved oxygen sensor are both electrically connected to the controller; the ferrous iron / persulfate delivery unit includes a ferrous iron / persulfate delivery port 8, and the ferrous iron / persulfate delivery port 8 is provided with two branch ports, and the two are respectively connected to the ferrous iron feeding pipeline and the persulfate feeding pipeline, and the ferrous iron feeding pipeline and the persulfate feeding pipeline are respectively provided with a constant flow pump 1 and a constant flow pump 2, and the constant flow pump 1 and the constant flow pump 2 are respectively connected to the constant flow pump and electrically connected to the controller;

[0031] The MABR sludge and sewage collaborative treatment unit includes a MABR reaction tank 9 and an aeration mechanism. A drainage and sludge outlet 10 is provided at the bottom of the MABR reaction tank 9. A membrane assembly 11 is provided in the MABR reaction tank 9. The membrane assembly 11 includes a plurality of hollow membrane fibers arranged in sequence. The membrane assembly 11 is a breathable polyvinylidene fluoride PVDF hollow fiber membrane assembly 11, and the membrane assembly 11 adopts a baffled arrangement.

[0032] Each hollow membrane fiber is provided with a gas inlet 12 at the head end and a gas outlet 13 at the tail end. The aeration mechanism includes an air inlet 14 and an air outlet 15. One end of the air inlet 14 is connected to an external air compressor, and the other end of the air inlet 14 is connected to a plurality of air inlet pipes 16. The number of the air inlet pipes 16 matches the number of the gas inlets 12, and the air inlet pipes 16 are connected to the gas inlets 12 accordingly. The end of the air outlet 15 close to the MABR reaction tank 9 is connected to a plurality of air outlet pipes 17. The number of the air outlet pipes 17 matches the number of the gas outlets 13, and the air outlet pipes are connected to the gas outlets 13 accordingly.

[0033] The MABR sludge-wastewater co-treatment unit also includes an online water quality monitoring device 18, which is a HACH SL1000 / 250 portable multi-parameter analyzer. This device is electrically connected to the controller. A sludge-wastewater circulation device is also installed within the MABR reaction tank 9. This device includes a magnetic circulation pump 23, an outlet pipe 24, and an inlet pipe 25. One end of the outlet pipe 24 is connected to the magnetic circulation pump 23, and the other end is located within the MABR reaction tank 9. One end of the inlet pipe 25 is connected to the magnetic circulation pump 23, and the other end is located within the MABR reaction tank 9.

[0034] Working process: sludge and sewage enter the pretreatment tank 2 through the water and mud inlet 7, the stirring motor 5 is started, and the sludge and sewage are mixed and stirred through the stirring shaft 3 and stirring blades 4 to ensure that the sludge and sewage are evenly mixed; the pH sensor and dissolved oxygen sensor monitor the pH value and dissolved oxygen content in the pretreatment tank in real time and transmit the data to the controller.

[0035] Based on data received by the controller, the ferrous iron / persulfate dosing unit delivers appropriate amounts of ferrous iron and persulfate to pretreatment tank 2. Constant flow pumps 1 and 2 control the ferrous iron and persulfate dosages, respectively, ensuring consistent dosing. Within the pretreatment tank, ferrous iron and persulfate react to produce a highly oxidizing substance, which aids in the treatment of sludge and wastewater.

[0036] The pretreated sludge sewage enters the MABR reaction tank 9 through the sludge outlet pipe 6. The sludge sewage will first pass through the through holes 22 on the sludge distribution plate 21, and then be evenly distributed in the MABR reaction tank 9. In the MABR reaction tank 9, the sludge sewage contacts the hollow membrane fibers in the membrane assembly 11. The air compressor supplies air to the aeration mechanism through the air inlet 14, and the gas enters the gas inlet 12 of the hollow membrane fiber through the air inlet pipe 16, and is then discharged from the gas outlet 13 of the hollow membrane fiber. In the process of gas passing through the hollow membrane fiber, oxygen is transferred to the sludge sewage, promoting the growth and metabolism of microorganisms. At the same time, the filtering effect of the membrane assembly 11 also helps to remove suspended matter and organic matter in the sludge and sewage. The online water quality monitoring mechanism 18 monitors the water quality in the MABR reaction tank 9 in real time and transmits the data to the controller. After MABR coordinated treatment, the sludge sewage is discharged from the device through the drainage sludge outlet 10.

[0037] The sludge and sewage circulation device includes a magnetic circulation pump 23, an outlet pipe 24, and an inlet pipe 25. One end of the outlet pipe 24 is connected to the magnetic circulation pump 23, and the other end is placed in the MABR reaction tank 9. One end of the inlet pipe 25 is connected to the magnetic circulation pump 23, and the other end is placed in the MABR reaction tank 9. Part of the treated sludge and sewage can be recycled back to the pretreatment tank or the MABR reaction tank to improve treatment efficiency.

[0038] Example 2

[0039] On the basis of Example 1, the stirring blade 4 has a plate-like structure, and the plane on which it is located is parallel to the axis of the stirring shaft 3. One side of the stirring blade 4 is hinged to the stirring shaft 3 through a hinge 19, and the rotation axis of the hinge 19 is parallel to the axis of the stirring shaft 3. A bidirectional torsion spring is provided between the stirring blade 4 and the hinge 19. A scraper 20 is detachably fixed to the inner wall of the pretreatment tank 2. The scraper 20 is arranged radially along the pretreatment tank 2. The scraper 20 has a strip scraping blade arranged toward the stirring shaft 3, and the length direction of the scraping blade is parallel to the axis of the stirring shaft 3, and the stirring shaft 3 can be rotated clockwise or counterclockwise so that the scraping blade can scrape off dirt on one side or the other side of the stirring blade 4.

[0040] During mixing, dirt may accumulate on the mixing blades. Keep the mixing blades clean by rotating the mixing shaft clockwise or counterclockwise and using the scraper blades on the scraper to scrape off dirt on one side or the other.

[0041] Although the present invention has been described in detail with reference to the accompanying drawings and in conjunction with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and substance of the present invention, persons of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall fall within the scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. Ferrous activated persulfate assisted MABR system for sludge and sewage treatment, characterized by: It includes a device body (1), a sludge and sewage pretreatment unit, a ferrous / persulfate dosing unit, a MABR sludge and sewage co-treatment unit and a controller; The sludge and sewage pretreatment unit is arranged at the upper end of the device body (1), and the MABR sludge and sewage coordinated treatment unit is arranged at the lower end of the device body (1); The sludge and sewage pretreatment unit comprises a pretreatment tank (2), wherein a stirring mechanism is provided in the pretreatment tank (2), wherein the stirring mechanism comprises a stirring shaft (3), stirring blades (4) provided on the periphery of the stirring shaft (3), and a stirring motor (5), wherein the stirring shaft (3) passes through both ends of the pretreatment tank (2) and is rotationally connected to the stirring motor (5); the stirring motor (5) is electrically connected to the controller, a mud and water outlet pipe (6) is provided at the bottom of the pretreatment tank (2), and a water and mud inlet (7) and a ferrous / persulfate salt inlet are provided at the top of the pretreatment tank (2). A dosing unit; a pH sensor and a dissolved oxygen sensor are provided in the pretreatment tank (2), and the pH sensor and the dissolved oxygen sensor are both electrically connected to the controller; the ferrous / persulfate dosing unit includes a ferrous / persulfate dosing port (8), and the ferrous / persulfate dosing port (8) is provided with two branches, and the two branches are respectively connected to a ferrous feeding pipeline and a persulfate feeding pipeline, and a constant flow pump 1 and a constant flow pump 2 are respectively provided on the ferrous feeding pipeline and the persulfate feeding pipeline, and the constant flow pump 1 and the constant flow pump 2 are respectively connected to the constant flow pump and electrically connected to the controller; The MABR sludge and sewage coordinated treatment unit comprises a MABR reaction tank (9) and an aeration mechanism, wherein a drainage and sludge outlet (10) is provided at the bottom of the MABR reaction tank (9), a membrane assembly (11) is provided in the MABR reaction tank (9), the membrane assembly (11) comprises a plurality of hollow membrane fibers arranged in sequence, a gas inlet (12) is provided at the head end of each hollow membrane fiber, and a gas outlet (13) is provided at the tail end, the aeration mechanism comprises an air inlet (14) and an air outlet (15), one end of the air inlet (14) is externally connected to an air compressor, and the other end of the air inlet (14) is connected to a plurality of air inlet pipes (16), the number of the air inlet pipes (16) matches the number of the gas inlets (12), and the air inlet pipes (16) are connected to the gas inlets (12) correspondingly, and the air outlet (15) is connected to a plurality of air outlet pipes (17) at one end of the air outlet (15) close to the MABR reaction tank (9), the number of the air outlet pipes (17) matches the number of the gas outlets (13), and the air outlet pipes are connected to the gas outlets (13) correspondingly; The MABR sludge and sewage collaborative treatment unit further includes a water quality online monitoring mechanism (18), and the water quality online monitoring mechanism (18) is electrically connected to the controller.

2. The ferrous activated persulfate assisted MABR system for collaboratively treating sludge and sewage according to claim 1, characterized in that: A sludge and sewage circulation device is also provided in the MABR reaction tank (9), and the sludge and sewage circulation device includes a magnetic circulation pump (23), an outlet pipe (24) and an inlet pipe (25), one end of the outlet pipe (24) is connected to the magnetic circulation pump (23), and the other end is placed in the MABR reaction tank (9), and one end of the inlet pipe (25) is connected to the magnetic circulation pump (23), and the other end is placed in the MABR reaction tank (9).

3. The ferrous activated persulfate assisted MABR system for collaboratively treating sludge and sewage as claimed in claim 2, characterized in that: The stirring blade (4) is in a plate-like structure, and its plane is parallel to the axis of the stirring shaft (3). One side of the stirring blade (4) is hinged to the stirring shaft (3) through a hinge (19). The rotation axis of the hinge (19) is parallel to the axis of the stirring shaft (3). A bidirectional torsion spring is provided between the stirring blade (4) and the hinge (19). A scraper (20) is detachably fixed to the inner wall of the pretreatment tank (2). The scraper (20) is arranged along the radial direction of the pretreatment tank (2). The scraper (20) has a strip-shaped scraping blade arranged toward the stirring shaft (3), and the length direction of the scraping blade is parallel to the axis of the stirring shaft (3). The stirring shaft (3) can be rotated clockwise or counterclockwise so that the scraping blade scrapes off dirt on one side or the other side of the stirring blade (4).

4. The ferrous activated persulfate assisted MABR system for collaboratively treating sludge and sewage as claimed in claim 3, characterized in that: The membrane assembly (11) is a breathable polyvinylidene fluoride (PVDF) hollow fiber membrane assembly, and the membrane assembly (11) adopts a baffle arrangement.

5. The ferrous activated persulfate assisted MABR system for collaboratively treating sludge and sewage as claimed in claim 4, characterized in that: A mud distribution plate (21) is further provided between the mud and water outlet pipe (6) and the MABR reaction tank (9). A mud distribution inlet is provided at the upper end of the mud distribution plate (21), and the mud distribution inlet is communicated with the mud and water outlet pipe (6). A plurality of through holes (22) are distributed at the bottom end of the mud distribution plate.

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