Biofilm peeling apparatus and sewage treatment method using the same

Abstract

The present application relates to a kind of biological membrane stripping device and sewage treatment method using it;Including biological degradation pool, the biological degradation pool is equipped with several biological membrane stripping units for sludge stripping and several attached biological membranes for cooperating with biological membrane stripping unit, biological membrane stripping unit includes the circulation pipeline for realizing the circulation of filler and sludge stripping, circulation pipeline includes the filler inlet being arranged at the front end, the filler outlet being arranged at the end, sludge stripping portion is equipped in the middle of circulation pipeline, sludge stripping portion is equipped with sludge collection and external discharge portion outside;Circulation pipeline is also equipped with power unit for filler circulation;With reasonable design, under the premise of not using sludge sedimentation tank, sludge is quickly treated, and the characteristics of improving MBBR processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a biofilm stripping device and a wastewater treatment method using the same. Background Technology

[0002] Current wastewater treatment mainly employs fluidized bed biofilm reactor (MBBR) technology. This technology involves three stages: pretreatment, biodegradation, and post-treatment. The post-treatment stage typically involves newly constructed sedimentation tanks for sludge collection and water filtration, followed by compliant discharge. These three stages are clearly segmented and require separate operating spaces for each. In the MBBR moving bed biofilm reactor, nitrifying bacteria and facultative anaerobic bacteria attach to the packing material. The long-aged biofilm attached to the suspended carrier provides a highly favorable environment for slow-growing nitrifying bacteria, enabling efficient nitrification. Meanwhile, the relatively short-aged activated sludge effectively removes organic matter. Sludge sedimentation tanks are generally used to collect aged sludge. However, traditional fluidized bed biofilm treatment technology has the following drawbacks: 1. Sludge sedimentation tanks require significant infrastructure investment and occupy a large area; 2. Traditional sludge collection takes approximately 2-4 hours, resulting in long collection times and low MBBR treatment efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a biofilm stripping device and a wastewater treatment method using the same, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A biofilm stripping device includes a biodegradation tank, which contains several biofilm stripping units for sludge stripping and several packing materials for attaching biofilm to cooperate with the biofilm stripping units. Each biofilm stripping unit includes a circulation pipe for circulating the packing materials and stripping sludge. The circulation pipe includes a packing material inlet at the front end and a packing material outlet at the end end. A sludge stripping section is located in the middle of the circulation pipe, and a sludge collection and discharge section is located outside the sludge stripping section. The circulation pipe also includes a power unit for circulating the packing materials.

[0006] The beneficial effects of this invention are as follows: by setting packing material in the biodegradation tank, nitrifying bacteria and facultative anaerobic bacteria can attach to the packing material; at the same time, by setting a biofilm stripping unit in conjunction with the aforementioned packing material to mechanically strip the sludge from the surface of the packing material, the packing material can be quickly recycled, thereby achieving the characteristics of rapid sludge treatment without the need for a sludge settling tank and improving the MBBR treatment efficiency.

[0007] Preferably, the sludge stripping section is a sludge separator provided on the circulation pipe, and the sludge separator is a hole and / or slit opened on the circulation pipe.

[0008] Preferably, the diameter of the hole is smaller than the diameter of the filler; the slit is arranged laterally or longitudinally.

[0009] Preferably, the sludge collection and discharge section includes a sludge collection tank located outside the circulation pipe, a sludge discharge port at the bottom of the sludge collection tank, and a sludge discharge pipe with a sludge discharge valve on the sludge discharge port.

[0010] Preferably, the power unit includes a compressed air pipe with a compressed air valve, the upper opening of the compressed air pipe being higher than the liquid level of the biodegradation tank, and the lower opening of the compressed air pipe being connected to the circulation pipe behind the packing inlet.

[0011] Preferably, the front part of the circulation pipe is a U-shaped structure, and the middle and rear parts are downwardly inclined structures; the packing inlet is located at the upper part of one side of the U-shaped structure, and the lower opening of the compressed air pipe is located at the lower part of the other side of the U-shaped structure; the sludge stripping section is located at the upper part of the downwardly inclined structure.

[0012] The present invention also includes a packing cleaning and dispersion section disposed outside the packing outlet at the end of the circulation pipeline; the packing cleaning and dispersion section includes a packing cleaning and dispersion tank with a bottom opening, the bottom opening of the packing cleaning and dispersion tank being connected to a conical packing disperser through several support rods, and a cleaning pipe with a cleaning valve being provided on the packing cleaning and dispersion tank corresponding to the lower part of the packing outlet.

[0013] A wastewater treatment method utilizing a biofilm stripping device, characterized in that the method comprises the following steps:

[0014] Step 1: After passing through the pretreatment tank, the wastewater enters the biodegradation tank. The biodegradation tank is equipped with several packing materials and several biofilm stripping units. The wastewater undergoes biodegradation in the biodegradation tank, and during the degradation process, sludge adheres to the outer surface of the packing materials.

[0015] Step 2: The sludge-attached packing enters the circulation pipe through the packing inlet. The compressed air valve is opened, and compressed air enters the circulation pipe through the compressed air pipe and moves towards the packing outlet through the lower part of the other side of the U-shaped structure. During the above process, the packing at the packing inlet enters the other side of the U-shaped structure under the action of negative pressure, and then the compressed air drives the packing to move towards the packing outlet.

[0016] Step 3: When the packing moves at the front of the circulation pipe, the packing rubs against each other and against the circulation pipe, causing the sludge to peel off. The packing and the peeled sludge enter the middle and rear of the circulation pipe together. The sludge falls into the sludge collection tank in the sludge peeling section, and the packing moves towards the packing outlet through the downward inclined structure of the circulation pipe.

[0017] Step 4: When the sludge in the sludge collection tank reaches a certain level, open the sludge discharge valve to allow the sludge to be discharged through the sludge discharge pipe.

[0018] Step 5: The packing material is discharged into the packing cleaning and dispersion tank through the packing outlet. The cleaning valve is opened, and the flushing water in the cleaning pipeline is used to flush the packing material. With the help of the conical packing disperser, the packing material is evenly dispersed in the biodegradation tank.

[0019] Step 6: While flushing the packing with the flushing water, a negative pressure is created at the packing outlet to allow the packing to quickly pass through the middle and rear of the circulation pipeline into the packing cleaning and dispersion tank.

[0020] A biofilm stripping device and a wastewater treatment method based on the above scheme, by setting up a biofilm stripping unit, can mechanically strip sludge from the surface of the packing material, thereby achieving the characteristics of eliminating the need for a sludge settling tank, reducing hydraulic retention time, and improving treatment efficiency. Furthermore, this invention uses a sludge collection tank to collect the sludge, achieving centralized sludge discharge without the need for a sludge settling tank. This invention also uses a circulation pipeline to achieve the recycling of the packing material while stripping sludge from its surface, thereby improving treatment efficiency. In this invention, the compressed air pipeline... Compressed air provides power to the front of the circulation pipeline, generating friction between the packing materials and between the packing materials and the circulation pipeline wall while transporting the packing material, thereby achieving separation between the packing material and sludge. The middle and rear of the circulation pipeline are powered by the weight of the packing material itself and the negative pressure generated by the subsequent cleaning of the packing material, so as to achieve rapid return of the packing material to the biodegradation tank in a clean state. Furthermore, in order to achieve uniform dispersion of the packing material in the biodegradation tank, this invention sets a conical packing disperser at the bottom of the packing material cleaning and dispersion tank. It has the characteristics of reasonable design, rapid sludge treatment without the use of sludge sedimentation tank, and improved MBBR treatment efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the biofilm stripping unit in this invention.

[0023] Figure 3 This is a schematic diagram of the structure of the first sludge stripping section of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of the second type of sludge stripping section of the present invention.

[0025] Figure 5 This is a schematic diagram of the third type of sludge stripping section of the present invention.

[0026] Figure 6 This is a schematic diagram of the fourth type of sludge stripping section of the present invention.

[0027] Figure 7 This is a schematic diagram of the fifth type of sludge stripping section of the present invention.

[0028] In the diagram: 1. Biodegradation tank; 2. Packing material; 3. Circulation pipeline; 4. Sludge collection tank; 5. Sludge discharge valve; 6. Sludge discharge pipeline; 7. Compressed air valve; 8. Packing material cleaning and dispersion tank; 9. Support rod; 10. Conical packing disperser; 11. Cleaning valve; 12. Biofilm stripping unit; 13. Sludge stripping section. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] Reference Figure 1-7 As shown, a biofilm stripping device includes a biodegradation tank 1, which contains several biofilm stripping units 12 for sludge stripping and several biofilm-attached packing materials 2 for cooperating with the biofilm stripping units 12. The biofilm stripping unit 12 includes a circulation pipe 3 for realizing the circulation of the packing material 2 and sludge stripping. The circulation pipe 3 includes a packing material inlet at the front end and a packing material outlet at the end end. A sludge stripping section (13) is provided in the middle of the circulation pipe 3, and a sludge collection and discharge section is provided outside the sludge stripping section 13. The circulation pipe 3 is also provided with a power unit for the circulation of the packing material. The biofilm stripping unit 12 described in this invention is applied in the biodegradation tank 1. It is mainly used to replace the traditional natural sedimentation method with a mechanical one, thereby achieving rapid separation of the packing material and sludge without the use of a sludge settling tank, and thus improving efficiency. In the above process, the power unit promotes the movement of the packing material 2 in the circulation pipe 3, which enters the biodegradation tank 1 for circulation after sludge separation. This avoids the investment and construction of a sludge settling tank, and can achieve rapid sludge separation, improving the treatment efficiency of MBBR. It also reduces the overall footprint of the fluidized bed biofilm treatment technology.

[0031] Furthermore, referring to Figure 3-7As shown, the sludge stripping section 13 is a sludge separator installed on the circulation pipe 3. The sludge separator is a hole and / or slit opened on the circulation pipe 3. The sludge separator described in this invention is mainly used to separate the packing material 2 and the sludge. That is, its structure is acceptable as long as it can separate the packing material 2 and the sludge. Preferably, the sludge separator is a hole, a slit, or a combination of holes and slits.

[0032] Furthermore, the diameter of the hole is smaller than the diameter of the packing 2; the gap is arranged laterally or longitudinally. When the sludge separator is a hole, the diameter of the hole is smaller than the diameter of the packing 2 to achieve separation between the two; similarly, when the sludge separator is a gap, the width of the gap should be smaller than the diameter of the packing 2; in addition, the gap described in this invention can be arranged longitudinally or laterally, that is, it is sufficient not to affect the separation of the packing 2 and the sludge.

[0033] Furthermore, the sludge collection and discharge section includes a sludge collection tank 4 located outside the circulation pipe 3. The bottom of the sludge collection tank 4 has a sludge discharge port, and the sludge discharge port is equipped with a sludge discharge pipe 6 with a sludge discharge valve 5. In this invention, the sludge collection tank 4 is located outside the sludge stripping section 13. After the sludge and packing material 2 are separated, the sludge enters the sludge collection tank 4 for temporary storage. When the sludge is collected to a certain amount, it can be discharged through the sludge discharge pipe 6 with the sludge discharge valve 5. Specifically, a sludge pump can be installed on the sludge discharge pipe 6, and a solid-liquid separation device or other subsequent treatment equipment can be installed at the end of the sludge discharge pipe 6. Since this is not the focus of this invention, it will not be described in detail. The solid-liquid separation device can be a plate and frame filter press, etc.

[0034] Furthermore, the power unit includes a compressed air pipe with a compressed air valve 7. The upper opening of the compressed air pipe is higher than the liquid level of the biodegradation tank 1, and the lower opening of the compressed air pipe is connected to the circulation pipe 3 at the rear of the packing inlet. When the packing 2 is at the packing inlet of the circulation pipe 3 or at the front of the circulation pipe 3, compressed air is discharged to the middle and rear of the circulation pipe 3, generating negative pressure to make the packing 2 quickly enter the circulation pipe 3 and move to the middle and rear of the circulation pipe 3. When the packing 2 is on the other side of the U-shaped structure, the compressed air pushes the packing 2 to move to the middle and rear of the circulation pipe 3. The above process enables the packing 2 to move at the front of the circulation pipe 3. During the above movement, friction is generated between the packing 2 and between the packing 2 and the circulation pipe 3, so that the sludge on the surface of the packing 2 is separated from the packing.

[0035] Furthermore, the front part of the circulation pipe 3 has a U-shaped structure, and the middle and rear parts have a downward sloping structure; the packing inlet is located at the upper part of one side of the U-shaped structure, and the lower opening of the compressed air pipe is located at the lower part of the other side of the U-shaped structure; the sludge stripping section 13 is located at the upper part of the downward sloping structure. The above structure enables the packing 2 to circulate rapidly within the circulation pipe 3.

[0036] The present invention also includes a packing cleaning and dispersion section disposed outside the packing outlet at the end of the circulation pipe 3; the packing cleaning and dispersion section includes a packing cleaning and dispersion tank 8 with a bottom opening, the bottom opening of the packing cleaning and dispersion tank 8 being connected to a conical packing disperser 10 via several support rods 9, and a cleaning pipe with a cleaning valve 11 being provided on the packing cleaning and dispersion tank 8 corresponding to the lower part of the packing outlet. The present invention, by setting up the packing cleaning and dispersion tank 9 and cooperating with the cleaning pipe, can not only achieve cleaning of the packing 2, but also generate negative pressure to allow the packing 2 to pass quickly through the middle and rear part of the circulation pipe 3, thereby improving the circulation efficiency; furthermore, by setting up the conical packing disperser 10, the packing 2 can be uniformly dispersed, avoiding accumulation that affects the subsequent reaction and the process of generating sludge; the shape of the conical packing disperser 10 described in the present invention can be a conventional shape such as a triangular pyramid, a square pyramid, or a cone, the main purpose of which is to disperse the packing 2 entering the biodegradation tank 1 to avoid aggregation.

[0037] The present invention also provides a wastewater treatment method using a biofilm stripping device, characterized in that the treatment method includes the following steps:

[0038] Step 1: After passing through the pretreatment tank, the wastewater enters the biodegradation tank 1. The biodegradation tank 1 is equipped with several packing materials 2 and several biofilm stripping units 12. The wastewater undergoes biodegradation in the biodegradation tank 1. During the degradation process, sludge adheres to the outer surface of the packing materials 2.

[0039] Step 2: The sludge-attached packing 2 enters the circulation pipe 3 through the packing inlet. The compressed air valve 7 is opened, and compressed air enters the circulation pipe 3 through the compressed air pipe and moves towards the packing outlet through the lower part of the other side of the U-shaped structure. During the above process, the packing 2 at the packing inlet enters the other side of the U-shaped structure under the action of negative pressure, and then the compressed air drives the packing 2 to move towards the packing outlet.

[0040] Step 3: When the packing 2 moves in front of the circulation pipe 3, the packing 2 rubs against each other and against the circulation pipe 3, causing the sludge to peel off; the packing 2 and the peeled sludge enter the middle and rear part of the circulation pipe 3 together, and the sludge falls off into the sludge collection tank 4 in the sludge peeling part 13. The packing 2 moves towards the packing outlet through the downward inclined structure of the circulation pipe 3.

[0041] Step 4: When the sludge in the sludge collection tank 4 has been collected to a certain extent, open the sludge discharge valve 5 to allow the sludge to be discharged through the sludge discharge pipe 6.

[0042] Step 5: The packing material 2 is discharged into the packing cleaning and dispersion tank 8 through the packing outlet. The cleaning valve 11 is opened, and the flushing water in the cleaning pipeline is used to flush the packing material 2. With the cooperation of the conical packing disperser 10, the packing material is evenly dispersed in the biodegradation tank 1.

[0043] Step 6: While rinsing the packing 2 with flushing water, a negative pressure is created at the packing outlet so that the packing 2 can quickly pass through the middle and rear part of the circulation pipe 3 and enter the packing cleaning and dispersion tank 8.

[0044] Traditional natural sedimentation methods suffer from drawbacks such as high investment costs, large footprint, and long hydraulic retention and settling times, further hindering MBBR treatment efficiency. This invention abandons traditional methods and adopts mechanical separation. A large number of packing materials 2 are placed in the biodegradation tank 1 where sludge is generated, enabling efficient nitrification. Simultaneously, multiple biofilm stripping units 12 are provided, allowing the packing materials 2 to circulate repeatedly between the units and the biodegradation tank 1. During this circulation, sludge is stripped from the surface of the packing materials 2, collected, and discharged centrally. This achieves rapid sludge treatment without the need for a sludge settling tank, improving MBBR treatment efficiency. The power unit of this invention not only provides power for the packing materials 2 to move at the front of the circulation pipe 3 but also separates the packing materials 2 from the sludge. The cleaning pipes in the packing material cleaning and dispersion tank 8 not only clean the packing materials 2 but also generate negative pressure to allow them to quickly pass through the middle and rear of the circulation pipe 3, thereby improving circulation efficiency.

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.

[0046] Example 1

[0047] A biofilm stripping device includes a biodegradation tank 1, which contains several biofilm stripping units 12 for sludge stripping and several biofilm-attached packing materials 2 that cooperate with the biofilm stripping units 12. Each biofilm stripping unit 12 includes a circulation pipe 3 for circulating the packing materials 2 and stripping the sludge. The circulation pipe 3 includes a packing material inlet at one end and a packing material outlet at one end. A sludge stripping section 13 is located in the middle of the circulation pipe 3, and a sludge collection and discharge section is located outside the sludge stripping section 13. A power unit for circulating the packing materials is also provided on the circulation pipe 3. The sludge stripping section 13 is a sludge separator located on the circulation pipe 3, and the sludge separator is a hole formed in the circulation pipe 3. The diameter of the hole is smaller than the diameter of the packing materials 2. The sludge collection and discharge section includes a sludge collection tank 4 located outside the circulation pipe 3. The bottom of the sludge collection tank 4 has a sludge discharge port, and the sludge discharge port has a sludge discharge pipe 6 with a sludge discharge valve 5. The power unit includes a compressed air pipeline with a compressed air valve 7. The upper opening of the compressed air pipeline is higher than the liquid level of the biodegradation tank 1, and the lower opening of the compressed air pipeline is connected to the circulation pipeline 3 behind the packing inlet. The front part of the circulation pipeline 3 has a U-shaped structure, and the middle and rear parts have a downward sloping structure. The packing inlet is located at the upper part of one side of the U-shaped structure, and the lower opening of the compressed air pipeline is located at the lower part of the other side of the U-shaped structure. The sludge stripping section 13 is located at the upper part of the downward sloping structure. It also includes a packing cleaning and dispersion section located outside the packing outlet at the end of the circulation pipeline 3. The packing cleaning and dispersion section includes a packing cleaning and dispersion tank 8 with a bottom opening. The bottom opening of the packing cleaning and dispersion tank 8 is connected to the conical packing disperser 10 through several support rods 9. The packing cleaning and dispersion tank 8 corresponding to the lower part of the packing outlet is equipped with a cleaning pipeline with a cleaning valve 11.

[0048] A wastewater treatment method utilizing a biofilm stripping device includes the following steps:

[0049] Step 1: After passing through the pretreatment tank, the wastewater enters the biodegradation tank 1. The biodegradation tank 1 is equipped with several packing materials 2 and several biofilm stripping units 12. The wastewater undergoes biodegradation in the biodegradation tank 1. During the degradation process, sludge adheres to the outer surface of the packing materials 2.

[0050] Step 2: The sludge-attached packing 2 enters the circulation pipe 3 through the packing inlet. The compressed air valve 7 is opened, and compressed air enters the circulation pipe 3 through the compressed air pipe and moves towards the packing outlet through the lower part of the other side of the U-shaped structure. During the above process, the packing 2 at the packing inlet enters the other side of the U-shaped structure under the action of negative pressure, and then the compressed air drives the packing 2 to move towards the packing outlet.

[0051] Step 3: When the packing 2 moves in front of the circulation pipe 3, the packing 2 rubs against each other and against the circulation pipe 3, causing the sludge to peel off; the packing 2 and the peeled sludge enter the middle and rear part of the circulation pipe 3 together, and the sludge falls off into the sludge collection tank 4 in the sludge peeling part 13. The packing 2 moves towards the packing outlet through the downward inclined structure of the circulation pipe 3.

[0052] Step 4: When the sludge in the sludge collection tank 4 has been collected to a certain extent, open the sludge discharge valve 5 to allow the sludge to be discharged through the sludge discharge pipe 6.

[0053] Step 5: The packing material 2 is discharged into the packing cleaning and dispersion tank 8 through the packing outlet. The cleaning valve 11 is opened, and the flushing water in the cleaning pipeline is used to flush the packing material 2. With the cooperation of the conical packing disperser 10, the packing material is evenly dispersed in the biodegradation tank 1.

[0054] Step 6: While rinsing the packing 2 with flushing water, a negative pressure is created at the packing outlet so that the packing 2 can quickly pass through the middle and rear part of the circulation pipe 3 and enter the packing cleaning and dispersion tank 8.

[0055] Example 2

[0056] A biofilm stripping device includes a biodegradation tank 1, which contains several biofilm stripping units 12 for sludge stripping and several biofilm-attached packing materials 2 that cooperate with the biofilm stripping units 12. Each biofilm stripping unit 12 includes a circulation pipe 3 for circulating the packing materials 2 and stripping the sludge. The circulation pipe 3 includes a packing material inlet at the front end and a packing material outlet at the end end. A sludge stripping section 13 is located in the middle of the circulation pipe 3, and a sludge collection and discharge section is located outside the sludge stripping section 13. The circulation pipe 3 also includes a power unit for circulating the packing materials. The sludge stripping section (13) is a sludge separator located on the circulation pipe 3, and the sludge separator is a slit opened on the circulation pipe 3. The slit is arranged longitudinally. The sludge collection and discharge section includes a sludge collection tank 4 located outside the circulation pipe 3. The bottom of the sludge collection tank 4 has a sludge discharge port, and the sludge discharge port has a sludge discharge pipe 6 with a sludge discharge valve 5. The power unit includes a compressed air pipeline with a compressed air valve 7. The upper opening of the compressed air pipeline is higher than the liquid level of the biodegradation tank 1, and the lower opening of the compressed air pipeline is connected to the circulation pipeline 3 behind the packing inlet. The front part of the circulation pipeline 3 has a U-shaped structure, and the middle and rear parts have a downward sloping structure. The packing inlet is located at the upper part of one side of the U-shaped structure, and the lower opening of the compressed air pipeline is located at the lower part of the other side of the U-shaped structure. The sludge stripping section 13 is located at the upper part of the downward sloping structure. It also includes a packing cleaning and dispersion section located outside the packing outlet at the end of the circulation pipeline 3. The packing cleaning and dispersion section includes a packing cleaning and dispersion tank 8 with a bottom opening. The bottom opening of the packing cleaning and dispersion tank 8 is connected to the conical packing disperser 10 through several support rods 9. The packing cleaning and dispersion tank 8 corresponding to the lower part of the packing outlet is equipped with a cleaning pipeline with a cleaning valve 11.

[0057] A wastewater treatment method utilizing a biofilm stripping device includes the following steps:

[0058] Step 1: After passing through the pretreatment tank, the wastewater enters the biodegradation tank 1. The biodegradation tank 1 is equipped with several packing materials 2 and several biofilm stripping units 12. The wastewater undergoes biodegradation in the biodegradation tank 1. During the degradation process, sludge adheres to the outer surface of the packing materials 2.

[0059] Step 2: The sludge-attached packing 2 enters the circulation pipe 3 through the packing inlet. The compressed air valve 7 is opened, and compressed air enters the circulation pipe 3 through the compressed air pipe and moves towards the packing outlet through the lower part of the other side of the U-shaped structure. During the above process, the packing 2 at the packing inlet enters the other side of the U-shaped structure under the action of negative pressure, and then the compressed air drives the packing 2 to move towards the packing outlet.

[0060] Step 3: When the packing 2 moves in front of the circulation pipe 3, the packing 2 rubs against each other and against the circulation pipe 3, causing the sludge to peel off; the packing 2 and the peeled sludge enter the middle and rear part of the circulation pipe 3 together, and the sludge falls off into the sludge collection tank 4 in the sludge peeling part 13. The packing 2 moves towards the packing outlet through the downward inclined structure of the circulation pipe 3.

[0061] Step 4: When the sludge in the sludge collection tank 4 has been collected to a certain extent, open the sludge discharge valve 5 to allow the sludge to be discharged through the sludge discharge pipe 6.

[0062] Step 5: The packing material 2 is discharged into the packing cleaning and dispersion tank 8 through the packing outlet. The cleaning valve 11 is opened, and the flushing water in the cleaning pipeline is used to flush the packing material 2. With the cooperation of the conical packing disperser 10, the packing material is evenly dispersed in the biodegradation tank 1.

[0063] Step 6: While rinsing the packing 2 with flushing water, a negative pressure is created at the packing outlet so that the packing 2 can quickly pass through the middle and rear part of the circulation pipe 3 and enter the packing cleaning and dispersion tank 8.

[0064] Example 3

[0065] A biofilm stripping device includes a biodegradation tank 1, which contains several biofilm stripping units 12 for sludge stripping and several biofilm-attached packing materials 2 that cooperate with the biofilm stripping units 12. Each biofilm stripping unit 12 includes a circulation pipe 3 for circulating the packing materials 2 and stripping the sludge. The circulation pipe 3 includes a packing material inlet at one end and a packing material outlet at one end. A sludge stripping section 13 is located in the middle of the circulation pipe 3, and a sludge collection and discharge section is located outside the sludge stripping section 13. A power unit for circulating the packing materials is also provided on the circulation pipe 3. The sludge stripping section 13 is a sludge separator located on the circulation pipe 3, consisting of holes and / or slits formed in the circulation pipe 3. The diameter of the holes is smaller than the diameter of the packing materials 2; the slits are arranged laterally. The sludge collection and discharge section includes a sludge collection tank 4 located outside the circulation pipe 3. The bottom of the sludge collection tank 4 has a sludge discharge port, and the sludge discharge port has a sludge discharge pipe 6 with a sludge discharge valve 5. The power unit includes a compressed air pipeline with a compressed air valve 7. The upper opening of the compressed air pipeline is higher than the liquid level of the biodegradation tank 1, and the lower opening of the compressed air pipeline is connected to the circulation pipeline 3 behind the packing inlet. The front part of the circulation pipeline 3 has a U-shaped structure, and the middle and rear parts have a downward sloping structure. The packing inlet is located at the upper part of one side of the U-shaped structure, and the lower opening of the compressed air pipeline is located at the lower part of the other side of the U-shaped structure. The sludge stripping section 13 is located at the upper part of the downward sloping structure. It also includes a packing cleaning and dispersion section located outside the packing outlet at the end of the circulation pipeline 3. The packing cleaning and dispersion section includes a packing cleaning and dispersion tank 8 with a bottom opening. The bottom opening of the packing cleaning and dispersion tank 8 is connected to the conical packing disperser 10 through several support rods 9. The packing cleaning and dispersion tank 8 corresponding to the lower part of the packing outlet is equipped with a cleaning pipeline with a cleaning valve 11.

[0066] A wastewater treatment method utilizing a biofilm stripping device includes the following steps:

[0067] Step 1: After passing through the pretreatment tank, the wastewater enters the biodegradation tank 1. The biodegradation tank 1 is equipped with several packing materials 2 and several biofilm stripping units 12. The wastewater undergoes biodegradation in the biodegradation tank 1. During the degradation process, sludge adheres to the outer surface of the packing materials 2.

[0068] Step 2: The sludge-attached packing 2 enters the circulation pipe 3 through the packing inlet. The compressed air valve 7 is opened, and compressed air enters the circulation pipe 3 through the compressed air pipe and moves towards the packing outlet through the lower part of the other side of the U-shaped structure. During the above process, the packing 2 at the packing inlet enters the other side of the U-shaped structure under the action of negative pressure, and then the compressed air drives the packing 2 to move towards the packing outlet.

[0069] Step 3: When the packing 2 moves in front of the circulation pipe 3, the packing 2 rubs against each other and against the circulation pipe 3, causing the sludge to peel off; the packing 2 and the peeled sludge enter the middle and rear part of the circulation pipe 3 together, and the sludge falls off into the sludge collection tank 4 in the sludge peeling part 13. The packing 2 moves towards the packing outlet through the downward inclined structure of the circulation pipe 3.

[0070] Step 4: When the sludge in the sludge collection tank 4 has been collected to a certain extent, open the sludge discharge valve 5 to allow the sludge to be discharged through the sludge discharge pipe 6.

[0071] Step 5: The packing material 2 is discharged into the packing cleaning and dispersion tank 8 through the packing outlet. The cleaning valve 11 is opened, and the flushing water in the cleaning pipeline is used to flush the packing material 2. With the cooperation of the conical packing disperser 10, the packing material is evenly dispersed in the biodegradation tank 1.

[0072] Step 6: While rinsing the packing 2 with flushing water, a negative pressure is created at the packing outlet so that the packing 2 can quickly pass through the middle and rear part of the circulation pipe 3 and enter the packing cleaning and dispersion tank 8.

[0073] Experimental Example: According to the "Design Code for Wastewater Treatment in Petrochemical Industry" GB50747-2012, the hydraulic retention time of sedimentation tanks is 2-4 hours. Taking 3 hours as an example, the technical solution of this invention saves 300m³ compared with the above-mentioned standard. 3 The construction cost of sludge sedimentation tanks is reduced, and the land area saved is 60-75 square meters. 3 This shortens the overall water retention time in the sedimentation tank by 3 hours.

[0074] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biofilm stripping device, comprising a biodegradation tank (1), characterized in that: The biodegradation tank (1) is equipped with several biofilm stripping units (12) for sludge stripping and several packing materials (2) for attaching biofilm to cooperate with the biofilm stripping units (12). The biofilm stripping unit (12) includes a circulation pipe (3) for realizing the circulation of packing material (2) and sludge stripping. The circulation pipe (3) includes a packing material inlet at the front end and a packing material outlet at the end end. A sludge stripping section (13) is provided in the middle of the circulation pipe (3), and a sludge collection and discharge section is provided outside the sludge stripping section (13). A power unit for packing material circulation is also provided on the circulation pipe (3). The sludge stripping section (13) is a sludge separator installed on the circulation pipe (3), and the sludge separator is a hole and / or gap opened on the circulation pipe (3).

2. The biofilm stripping device according to claim 1, characterized in that: The diameter of the hole is smaller than the diameter of the packing (2); The gap can be set horizontally or vertically.

3. The biofilm stripping device according to claim 1, characterized in that: The sludge collection and discharge section includes a sludge collection tank (4) located outside the circulation pipe (3), a sludge discharge port at the bottom of the sludge collection tank (4), and a sludge discharge pipe (6) with a sludge discharge valve (5) on the sludge discharge port.

4. The biofilm stripping device according to claim 1, characterized in that: The power unit includes a compressed air pipe with a compressed air valve (7), the upper opening of the compressed air pipe is higher than the liquid level of the biodegradation tank (1), and the lower opening of the compressed air pipe is connected to the circulation pipe (3) at the rear of the packing inlet.

5. A biofilm stripping device according to claim 4, characterized in that: The front part of the circulation pipe (3) is a U-shaped structure, and the middle and rear parts are downward inclined structures; The packing inlet is located at the upper part of one side of the U-shaped structure, and the lower end opening of the compressed air pipe is located at the lower part of the other side of the U-shaped structure; the sludge stripping section (13) is located at the upper part of the downwardly inclined structure.

6. The biofilm stripping device according to claim 1, characterized in that: It also includes a packing cleaning and dispersion section located outside the packing outlet at the end of the circulation pipe (3); The packing cleaning and dispersion section includes a packing cleaning and dispersion tank (8) with a bottom opening. The bottom opening of the packing cleaning and dispersion tank (8) is connected to the conical packing disperser (10) through several support rods (9). A cleaning pipe with a cleaning valve (11) is provided on the packing cleaning and dispersion tank (8) corresponding to the lower part of the packing outlet.

7. A wastewater treatment method using any one of the biofilm stripping devices according to claims 1-6, characterized in that: The processing method includes the following steps: Step 1: After passing through the pretreatment tank, the sewage enters the biodegradation tank (1). The biodegradation tank (1) is equipped with several packing materials (2) and several biofilm stripping units (12). The sewage undergoes biodegradation in the biodegradation tank (1). During the degradation process, sludge adheres to the outer surface of the packing materials (2). Step 2: The sludge-attached packing (2) enters the circulation pipe (3) through the packing inlet. The compressed air valve (7) is opened, and the compressed air enters the circulation pipe (3) through the compressed air pipe and moves towards the packing outlet through the lower part of the other side of the U-shaped structure. During the above process, the packing (2) at the packing inlet enters the other side of the U-shaped structure under the action of negative pressure, and then the compressed air drives the packing (2) to move towards the packing outlet. Step 3: When the packing (2) moves in front of the circulation pipe (3), the packing rubs against each other and against the circulation pipe (3), causing the sludge to peel off; the packing (2) and the peeled sludge enter the middle and rear part of the circulation pipe (3) together, and the sludge falls into the sludge collection tank (4) in the sludge peeling part (13), and the packing (2) moves towards the packing outlet through the downward inclined structure of the circulation pipe (3); Step 4: When the sludge in the sludge collection tank (4) has been collected to a certain extent, open the sludge discharge valve (5) to allow the sludge to be discharged through the sludge discharge pipe (6); Step 5: The packing (2) is discharged into the packing cleaning and dispersion tank (8) through the packing outlet. The cleaning valve (11) is opened, and the flushing water in the cleaning pipeline is used to flush the packing (2). With the cooperation of the conical packing disperser (10), the packing is evenly dispersed in the biodegradation tank (1). Step 6: While rinsing the packing (2) with the flushing water, a negative pressure is formed at the packing outlet so that the packing (2) can quickly pass through the middle and rear part of the circulation pipe (3) and enter the packing cleaning and dispersion tank (8).

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