Biological membrane treatment method suitable for sewage in high-speed service area

Abstract

The invention discloses a sewage biological membrane treatment device and method suitable for a high-speed service area, and belongs to the field of wastewater treatment processes. The invention discloses a sewage biological membrane treatment method suitable for a high-speed service area. The method comprises the following steps: S1, detecting and analyzing the quality of wastewater in a to-be-treated area: accurately measuring parameters such as pollutant concentration and water inlet flow in the to-be-treated wastewater; s2, rapid sludge inoculation: selecting high-porosity polyurethane sponge as a filler base material, and soaking the filler base material in activated sludge of a sewage treatment system which runs stably in advance so as to enrich the activated sludge; s3, preparing a fixed fluidized filler: filling the spherical shell with a polyurethane sponge filler; the device has two characteristics of a fixed bed and a fluidized bed, and the contact efficiency between the wastewater and the filler is remarkably improved on the basis of keeping the stability of the system; therefore, the sewage treatment device has an excellent treatment effect on high-water-quantity impact and high-concentration pollutant wastewater.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment technology, and in particular to a method suitable for biofilm treatment of sewage in high-speed service areas. Background Art

[0002] Suspended fillers play a core role in the moving bed biofilm reactor (MBBR) technology, and have a significant impact on the degradation capacity of pollutants and the fluidity environment of the fillers inside the reactor. This technology relies on the adsorption and growth of microorganisms on the surface of suspended fillers, thereby promoting the removal of pollutants. In the moving bed biofilm reactor (MBBR) system, the application of suspended fillers is the key to achieving effective pollutant removal. These fillers are usually made of materials such as polypropylene, polyurethane or specially treated materials to meet the system's requirements for biofilm loading and pollution treatment. With the continuous advancement of MBBR technology, the design and material selection of fillers have become an important driving force for the development of this technology. Many domestic and foreign studies have demonstrated the possibility of improving system performance by optimizing filler design, emphasizing the importance of ensuring filler fluidization and optimizing filler surface properties. The density design of suspended fillers is preferably close to the water density so that it can be kept suspended in water through proper aeration. Therefore, the correct selection of filler type, adjustment of filler filling ratio and reasonable configuration of aeration volume are the core elements to ensure the efficient and stable operation of MBBR systems.

[0003] In the application of modern moving bed biofilm reactor (MBBR), there are many types of fillers, including plastics, bioceramics, natural materials and composite materials. These fillers can be roughly divided into two categories: fixed bed and fluidized bed according to their operating status in the reactor. For fixed bed system, the filler is stably fixed inside the reactor so that the wastewater flowing through it comes into contact with it. The main advantages of this type of system include simple structural design, high system stability and low risk of filler loss. However, it also faces problems such as the possible blockage of the filler surface due to the increase in thickness of the biofilm, insufficient oxygen transfer efficiency, and the treatment of high concentrations. In the fluidized bed system, the filler is suspended or flowing due to the water flow, which significantly improves the contact efficiency between the wastewater and the filler. Compared with the fixed bed, the fluidized bed is characterized by higher material transfer efficiency, making it more suitable for treating organic wastewater with higher concentrations. The faster biofilm renewal rate effectively reduces the risk of blockage, and better oxygen transfer efficiency, thereby improving the treatment efficiency. Nevertheless, fluidized bed technology also has some limitations, such as the high complexity of reactor design and operation, the loss of filler due to the outflow of treated water, and the additional energy required to maintain the fluidization state of heavy filler. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a method suitable for biofilm treatment of sewage in highway service areas.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for biofilm treatment of sewage in a highway service area, comprising the following steps:

[0007] S1: Wastewater quality testing and analysis in the treatment area: Accurately measure the concentration of pollutants and inlet flow rate in the wastewater to be treated;

[0008] S2: Rapid sludge inoculation: A polyurethane sponge with high porosity is selected as the filler substrate and pre-immersed in the activated sludge of a sewage treatment system that has been operating stably to enrich the activated sludge;

[0009] S3: Preparation of fixed fluidized filler: filling the spherical shell with polyurethane sponge filler;

[0010] S4: Array packing assembly: The spherical packing formed by preparing the packing to fill the spherical shell is connected in a beaded manner through a series of rods, arranged in a predetermined array, and fixed in the reactor shell;

[0011] S5: Subsequent inspection and maintenance of the system.

[0012] Preferably, in step S1, the specific analysis process includes: setting a flow meter at the water inlet end of the treatment area, performing multiple flow monitoring in a ten-day cycle, recording the flow changes at each moment and the daily flow changes; analyzing the water volume fluctuations in the treatment area, examining its water volume shock load, and evaluating whether a moving bed bioreactor can be used for treatment.

[0013] Preferably, in step S2, the specific analysis process includes: collecting activated sludge from existing sewage treatment facilities with stable operation and effluent water quality that meets the expected treatment target. When collecting, it should be ensured that the sludge has high microbial activity and diversity, and the collected activated sludge is subjected to necessary physical, chemical and biological property analysis.

[0014] Preferably, in step S3, the specific analysis process includes: selecting polypropylene material to prepare a spherical shell; the volume of the shell is more than three times that of the sponge filler, and the spherical shell is hollowed out in a large area to allow water to flow in and out freely; filling the inoculated polyurethane sponge filler in the spherical shell to ensure that the sponge filler can be fluidized in the spherical shell and can change with water flow disturbance under aeration conditions.

[0015] Preferably, in step S4, the specific analysis process includes: after the fixed fluidized bed filler is prepared, the series rod is made of corrosion-resistant metal material and prepared into a thin column; a certain number of spherical shells filled with fillers are connected in series using the series rod, and are arranged in an array-like form in a block matrix in the reactor shell, wherein the number of the series spherical shells is determined according to the height of the reaction facility, and the reaction facility is filled as much as possible.

[0016] Preferably, a circular protrusion is provided at the bottom of the packing area of ​​the reactor shell according to a preset array matrix block, so as to facilitate connection with the series rod, so that the packing group can be fixed in the reactor evenly and orderly, and it is also convenient to disassemble, which is beneficial to subsequent maintenance and repair work.

[0017] A biofilm treatment device for sewage in a high-speed service area also includes seepage holes distributed in a ring array on the outer wall of a spherical shell, and the inner walls of the fine holes opened at the top and bottom ends of the spherical shell are slidably connected to the outer wall of the series rod, thereby connecting multiple spherical shells filled with fillers in series into a bundle.

[0018] Preferably, the spherical shell includes an upper shell and a lower shell, the inner wall of the upper shell is fixedly mounted with a through pipe 1, the inner wall of the lower shell is fixedly connected with a through pipe 2, the top outer wall of the through pipe 2 is fixedly mounted with a threaded connecting sleeve, the bottom outer wall of the through pipe 1 is provided with an external thread, the outer wall of the through pipe 1 is threadedly connected to the inner wall of the threaded connecting sleeve via the external thread, and the inner walls of the through pipe 1 and the through pipe 2 are slidably connected to the outer wall of the series rod.

[0019] Compared with the prior art, the present invention provides a method for biofilm treatment of sewage in highway service areas, which has the following beneficial effects:

[0020] 1. This method is suitable for biofilm treatment of sewage in highway service areas. It has the characteristics of both fixed bed and fluidized bed. On the basis of maintaining the stability of the system, it significantly improves the contact efficiency between wastewater and filler; it has excellent treatment effects in dealing with high water volume impact and high-concentration pollutant wastewater;

[0021] 2. This method is suitable for biofilm treatment of sewage in highway service areas. It is easy to adjust and maintain. The detachable design allows maintenance personnel to easily adjust the filling rate of the filler, as well as perform subsequent maintenance and replacement of the filler. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front view of a reactor shell of a sewage biofilm treatment device suitable for a highway service area proposed by the present invention;

[0023] Figure 2 This is an internal view of a reactor shell of a biofilm treatment device for sewage in a highway service area proposed by the present invention;

[0024] Figure 3 A cross-sectional view of a spherical shell of a sewage biofilm treatment device suitable for a highway service area proposed by the present invention;

[0025] Figure 4 This is a schematic diagram of the decomposition of a spherical shell of a sewage biofilm treatment device suitable for a highway service area proposed by the present invention.

[0026] In the figure: 1, reactor shell; 2, spherical shell; 201, upper shell; 202, lower shell; 203, through pipe 1; 204, through pipe 2; 205, threaded connecting sleeve; 206, seepage hole; 401, fine hole; 402, series rod; 5, circular ring protrusion; 6, clamp; 601, upper hoop; 602, lower hoop; 603, connecting block; 604, rotating shaft; 605, threaded hole; 606, bolt; 607, sleeve; 7, cross plate. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] Embodiment 1:

[0030] A method for biofilm treatment of sewage in a highway service area, comprising:

[0031] Wastewater quality testing and analysis in the treatment area: Accurately measure the pollutant concentration and water flow rate in the wastewater to be treated. Based on these data, further classify and analyze the wastewater to ensure the adaptability and effectiveness of the treatment strategy and provide a basis for the optimal configuration of the filler;

[0032] Specifically: a flow meter is set at the water inlet of the treatment area, and flow monitoring is performed multiple times in a ten-day cycle to record the flow changes at each moment and daily; the water volume fluctuation in the treatment area is analyzed, its water volume shock load is examined, and whether a moving bed bioreactor can be used for treatment is evaluated;

[0033] Furthermore, multiple sampling points are set at the water inlet of the treatment area; sampling is carried out in batches at multiple times to calculate the average pollutant concentration, and to analyze whether the wastewater in the treatment area is of medium or high concentration and whether it can be treated using a moving bed bioreactor. The main pollutant indicators analyzed include NH4 + -N, NO3 - -N, TP and COD, etc., and analyze the changes in pollutant concentrations at different times when water volume fluctuations occur

[0034] Rapid sludge inoculation: A polyurethane (PPC) sponge with high porosity is selected as the filler substrate and pre-immersed in the activated sludge of a sewage treatment system that has been operating stably to enrich the activated sludge. This process is intended to promote the rapid formation of biofilms and to enhance the stability and treatment efficiency of the biofilms by fixing the activated sludge on the filler surface.

[0035] Specifically: Collect activated sludge from existing sewage treatment facilities (activated sludge systems) that are in stable operation and whose effluent quality meets the expected treatment target. When collecting, ensure that the sludge has high microbial activity and diversity. Perform necessary physical, chemical and biological property analyses on the collected activated sludge, including but not limited to sludge concentration (MLSS), sludge settling capacity (SV30), microbial community structure, etc., to evaluate its applicability;

[0036] Select polyurethane sponge as the matrix filler and clean it thoroughly before use; immerse the filler in the activated sludge, stir and aerate it, so that the activated sludge is fully adsorbed on the filler to promote the rapid formation of biofilm;

[0037] Preparation of fixed fluidized filler: A spherical shell 2 is used and a polyurethane (PPC) sponge filler is filled therein. Based on the above water quality analysis results, the filling rate and the optimal amount of the filler are determined to ensure efficient wastewater treatment performance;

[0038] Specifically: polypropylene material is selected to prepare the spherical shell 2; the volume of the shell is more than three times that of the sponge filler, and the spherical shell is hollowed out in a large area to allow water to flow in and out freely; the inoculated polyurethane sponge filler is filled in the spherical shell 2 to ensure that the sponge filler can be in a fluidized state in the spherical shell 2 and can change with the disturbance of the water flow under aeration;

[0039] Furthermore, the filling rate of the sponge filler in the spherical shell 2 is determined to be about 60% to 70%, so as to ensure that the sponge filler is fully fluidized and absorbs enough activated sludge to provide enough space for the growth of the biofilm, and the spherical shell 2 is designed to have fine holes 401 in the vertical direction to facilitate the subsequent insertion of the serial rods 402 made of columnar corrosion-resistant materials;

[0040] Array packing assembly: the spherical packing prepared by filling the packing into the spherical shell 2 is connected in a beaded manner through a series rod 402 made of a corrosion-resistant columnar material, arranged in a predetermined array, fixed in the reactor shell 1, and ensuring that the PPC packing has sufficient flow space inside the spherical shell 2 to promote sufficient contact between the microorganisms and the pollutants in the wastewater;

[0041] Specifically: after the fixed fluidized packing is prepared, the series rod 402 is made of corrosion-resistant metal material and is made into a thin column; a certain number of packings are connected in series and arranged in the reactor shell 1 in an array-like form in blocks and matrices, wherein the number of series packings is determined according to the height of the reaction facility, so that the packing group fills the reaction facility as much as possible;

[0042] Furthermore, a circular protrusion 5 is provided at the bottom of the packing area of ​​the reactor shell 1 according to a preset array matrix block, so as to facilitate connection with the series rod 402, so that the packing group can be fixed in the reactor evenly and orderly, and it is also convenient to disassemble, which is beneficial to subsequent maintenance and repair work;

[0043] On the basis of the above embodiment, the filling rate of the packing group is determined by the above-mentioned water quality analysis results. The main problems of the wastewater in the treatment area are analyzed. According to existing research, to improve the removal efficiency of COD, the filling rate of the packing group should be adjusted to about 30% to 50%; to improve the removal efficiency of organic matter such as nitrogen and phosphorus, the filling rate of the packing group should be adjusted to about 50% to 90%. The specific filling rate should be adjusted at any time according to the effluent effect during the operation of the reaction device;

[0044] Subsequent inspection and maintenance of the system: The packing components in the reaction facility are designed as detachable structures. In actual operation, they are regularly disassembled to promptly clean the suspended matter and impurities trapped inside the packing components to prevent the functional degradation of the biofilm and the decline of system efficiency. In addition, in long-term use, the packing group is regularly replaced to prevent damage to the packing group that affects system operation;

[0045] Specifically, the array-type fixed bed fluidized packing group has a good suspended matter interception ability. The packing assembly is set to be detachable in the aforementioned process. After the reaction facility has been running for a period of time, the packing group needs to be taken out regularly for flushing to remove the suspended impurities trapped in the packing, so as to avoid the functional degradation of the microbial biofilm and the decrease of system efficiency.

[0046] On the basis of the above-mentioned embodiment, the fixed bed fluidized bed packing group is regularly inspected and maintained. Once any form of damage is found in the packing component, it needs to be quickly replaced to ensure the continuous operation and processing efficiency of the system.

[0047] Embodiment 2:

[0048] Reference Figure 1 - Figure 4 , a biofilm treatment device for sewage in a high-speed service area, comprising a reactor shell 1 and a filler assembly installed in the reactor shell 1;

[0049] The filler assembly includes: the spherical shell 2 mentioned in the first embodiment and the filler filled in the spherical shell 2, the spherical shell 2 is made of polypropylene material, and the filler is made of polyurethane sponge;

[0050] The spherical shell 2 is provided with seepage holes 206 in an annular array, and fine holes 401 are provided at the top and bottom of the spherical shell 2, and a series rod 402 made of corrosion-resistant metal material in a thin columnar shape is slidably connected in the fine hole 401, so that a plurality of spherical shells 2 filled with fillers are connected in series into a bundle, and a plurality of series rods 402 connected in series with the spherical shells 2 are arranged in a rectangular array in the reactor shell 1, and an annular protrusion 5 corresponding to the bottom end of the series rod 402 is provided on the inner wall of the reactor shell 1, and the inner wall of the annular protrusion 5 is slidably connected to the outer wall of the bottom end of the series rod 402, and the top of the series rod 402 is detachably connected to the top of the reactor shell 1;

[0051] When in use, the filler is filled in the spherical shell 2 and mounted on the series rods 402, and then the series rods 402 are installed in the reactor shell 1, arranged in a predetermined array, and fixed in the reactor shell 1 to promote full contact between the microorganisms on the filler and the pollutants in the wastewater;

[0052] Specifically: a transverse plate 7 is fixedly installed on the top of the reactor shell 1, and a clamp 6 connected to the top of the series rod 402 is installed on the inner side of the transverse plate 7. The clamp 6 includes an upper hoop 601 and a lower hoop 602. A rotating shaft 604 is fixedly connected to one side of the bottom end of the upper hoop 601, and a sleeve 607 is fixedly installed on the side of the lower hoop 602 close to the rotating shaft 604. The inner wall of the sleeve 607 is rotatably connected to the outer wall of the rotating shaft 604. The outer walls of the upper hoop 601 and the lower hoop 602 on the other side are fixedly connected to a connecting block 603. Threaded holes 605 are provided on the two groups of connecting blocks 603. Bolts 606 are threadedly connected to the inner walls of the threaded holes 605. When installing the series rod 402, the bottom end of the series rod 402 is inserted into the annular protrusion 5, and the top end is clamped into the lower hoop 602 on the transverse plate 7. The upper hoop 601 and the lower hoop 602 are rotated to close, and fixed by bolts 606 to limit the top of the series rod 402.

[0053] Further: the spherical shell 2 includes an upper shell 201 and a lower shell 202, the inner wall of the upper shell 201 is fixedly installed with a through pipe 1 203, the inner wall of the lower shell 202 is fixedly connected with a through pipe 204, the top outer wall of the through pipe 204 is fixedly installed with a threaded connection sleeve 205, the bottom outer wall of the through pipe 1 203 is provided with an external thread, the outer wall of the through pipe 1 203 is threadedly connected to the inner wall of the threaded connection sleeve 205 through the external thread, and the inner walls of the through pipe 1 203 and the through pipe 2 204 are slidably connected to the outer wall of the series rod 402;

[0054] When in use, fill the upper shell 201 and the lower shell 202 with fillers, and connect the upper shell 201 and the lower shell 202 with the threaded connection sleeve 205 on the through pipe 204 through the external thread of the outer wall of the through pipe 1 203, so as to realize the splicing between the upper shell 201 and the lower shell 202, and then the through pipe 1 203 and the through pipe 2 204 are sleeved on the series rod 402, which is convenient to use;

[0055] In the above scheme, the spherical shell 2 is sleeved on the serial rod 402, and multiple spherical shells 2 are gathered together. There is no gap between adjacent spherical shells 2, which affects the use efficiency. For this reason, an internal thread is provided on the inner wall of the through pipe 204, and an external thread is provided on the outer wall of the serial rod 402. When installing the spherical shell 2, the through pipe 204 is rotated to adjust the position on the outer wall of the serial rod 402, which is convenient for adjustment.

[0056] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for biofilm treatment of sewage in highway service areas, characterized in that: The steps include: S1: Wastewater quality testing and analysis in the treatment area: Accurately measure the concentration of pollutants and inlet flow rate in the wastewater to be treated; S2: Rapid sludge inoculation: A polyurethane (PPC) sponge with high porosity is selected as the filler substrate and pre-immersed in the activated sludge of a sewage treatment system that has been operating stably to enrich the activated sludge; S3: Preparation of fixed fluidized filler: filling the spherical shell (2) with polyurethane sponge filler; S4: Array packing assembly: the spherical packing formed by preparing the packing to fill the spherical shell (2) is connected in a beaded manner through a series of rods (402), arranged in a predetermined array, and fixed in the reactor shell (1); S5: Subsequent inspection and maintenance of the system.

2. A method for biofilm treatment of sewage in highway service areas according to claim 1, characterized in that: In step S1, the specific analysis process includes: setting a flow meter at the water inlet end of the treatment area, performing multiple flow monitoring in a ten-day cycle, recording the flow changes at each moment and the daily flow changes; analyzing the water volume fluctuations in the treatment area, examining its water volume shock load, and evaluating whether a moving bed bioreactor can be used for treatment.

3. A method for biofilm treatment of sewage in highway service areas according to claim 2, characterized in that: In step S2, the specific analysis process includes: collecting activated sludge from existing sewage treatment facilities with stable operation and effluent water quality that meets the expected treatment target. When collecting, it should be ensured that the sludge has high microbial activity and diversity, and the collected activated sludge is subjected to necessary physical, chemical and biological property analysis.

4. A method for biofilm treatment of sewage in highway service areas according to claim 1, characterized in that: In step S3, the specific analysis process includes: selecting polypropylene material to prepare a spherical shell (2); the volume of the shell is more than three times that of the sponge filler, and a large area of ​​the spherical shell is hollowed out to allow water to flow in and out freely; filling the inoculated polyurethane sponge filler in the spherical shell (2), ensuring that the sponge filler can be in a fluidized state in the spherical shell (2) and can change with water flow disturbance under aeration.

5. The method for biofilm treatment of sewage in highway service areas according to claim 1, characterized in that: In step S4, the specific analysis process includes: after the fixed fluidized filler is prepared, the series rod (402) is made of corrosion-resistant metal material and prepared into a thin column; a certain number of spherical shells (2) filled with fillers are connected in series using the series rod (402), and are arranged in an array-like form in a block matrix in the reactor shell (1), wherein the number of the series spherical shells (2) is determined according to the height of the reaction facility, and the reaction facility is filled as much as possible.

6. A method for biofilm treatment of sewage in highway service areas according to claim 5, characterized in that: A circular protrusion (5) is arranged at the bottom of the packing area of ​​the reactor shell (1) according to a preset array matrix block, so as to facilitate connection with the series rod (402), so that the packing group can be fixed in the reactor evenly and orderly, and is also convenient for disassembly, which is beneficial to subsequent maintenance and repair work.

7. A biofilm treatment device for sewage in a highway service area, applied to a biofilm treatment method for sewage in a highway service area as claimed in any one of claims 1 to 6, characterized in that: It also includes seepage holes (206) distributed in an annular array and opened on the outer wall of the spherical shell (2), and the inner walls of the fine holes (401) opened at the top and bottom ends of the spherical shell (2) are slidably connected to the outer wall of the series connection rod (402), so that a plurality of spherical shells (2) filled with fillers are connected in series into a bundle.

8. The biofilm treatment device for sewage in a highway service area according to claim 7 is characterized in that: The spherical shell (2) comprises an upper shell (201) and a lower shell (202), and a through pipe (203) is fixedly mounted on the inner wall of the upper shell (201).

9. The biofilm treatment device for sewage in a highway service area according to claim 8, characterized in that: The inner wall of the lower shell (202) is fixedly connected with a second through pipe (204), the top outer wall of the second through pipe (204) is fixedly installed with a threaded connection sleeve (205), and the bottom outer wall of the first through pipe (203) is provided with an external thread.

10. A biofilm treatment device for sewage in a highway service area according to claim 9, characterized in that: The outer wall of the through pipe 1 (203) is threadedly connected to the inner wall of the threaded connection sleeve (205) via an external thread, and the inner walls of the through pipe 1 (203) and the through pipe 2 (204) are slidably connected to the outer wall of the series rod (402).

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