Membrane bioreactor for sewage treatment

Abstract

The utility model discloses a membrane bioreactor for sewage treatment, and relates to the field of sewage treatment. The membrane bioreactor for sewage treatment comprises a treatment box, two sides of the upper end of the treatment box are respectively and fixedly communicated with a water inlet pipe and a water outlet pipe, and the membrane bioreactor also comprises plate frame type membrane assemblies which are vertically arranged in the treatment box at equal intervals and are positioned between the water inlet pipe and the water outlet pipe; impurities on the surface of the plate-and-frame type membrane module can be cleaned without detaching the plate-and-frame type membrane module, the cleaning process is greatly simplified, the labor and time cost is reduced, the air spraying pipe reciprocates up and down and is matched with the air spraying head to obliquely spray air, all-directional and dynamic cleaning can be performed on the surface of the plate-and-frame type membrane module, and compared with a traditional static cleaning mode (such as pure soaking and flushing), the cleaning efficiency is greatly improved. The influence of impurity residues on the water flow through efficiency of the membrane component is reduced; the continuous and efficient work of the membrane component is ensured; the service life of the membrane component is prolonged; and the replacement frequency and cost of the membrane component are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically, it relates to a membrane bioreactor for wastewater treatment. Background Technology

[0002] Membrane bioreactor (MBR) is a highly efficient wastewater treatment system that combines membrane separation technology with biological treatment technology. Its core principle is to utilize the physical retention effect of membrane modules (such as plate and frame type, hollow fiber type, etc.) to retain activated sludge and macromolecular organic matter in the reactor, achieving solid-liquid separation. At the same time, organic pollutants in wastewater are removed through microbial degradation. Traditional MBR systems typically include a treatment tank, membrane modules, inlet and outlet pipes, etc. Wastewater enters the treatment tank through the inlet pipe. Under the filtration effect of the membrane modules, the purified water is discharged through the outlet pipe, while sludge and impurities are retained on the membrane surface or inside the reactor. The performance of the membrane modules directly affects the system's treatment efficiency and effluent quality. Its structural design and operation mode are key to the development of MBR technology.

[0003] During long-term operation, a large amount of trapped activated sludge, macromolecular organic matter and other impurities will gradually accumulate on the surface of the membrane module, forming a filter cake layer or causing membrane pore blockage, resulting in a decrease in membrane flux and an increase in transmembrane pressure, which seriously affects the water flow efficiency and purification effect of the system. In order to maintain the system performance, it is necessary to frequently shut down the machine and remove the membrane module from the treatment tank for chemical cleaning or physical rinsing. The operation is cumbersome and time-consuming, which not only increases labor costs, but may also damage the membrane module due to frequent disassembly and assembly, shortening its service life. In view of this, this utility model is proposed. Utility Model Content

[0004] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide a membrane bioreactor for wastewater treatment that can overcome or at least partially solve the above problems.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows: a membrane bioreactor for wastewater treatment includes a treatment tank, with an inlet pipe and an outlet pipe fixedly connected to the upper two sides of the treatment tank, respectively. It also includes: a plate-and-frame membrane module, vertically installed at equal intervals within the treatment tank and located between the inlet and outlet pipes; an air jet pipe, liftably mounted within the treatment tank and located on the side of the plate-and-frame membrane module near the filter surface; air jet heads, fixedly connected at equal intervals to the side of the air jet pipe near the plate-and-frame membrane module; and a sewage pipe with multiple drainage ports, fixedly connected to the lower end of one side of the treatment tank. The treatment tank has a sewage outlet on the side of the plate-and-frame membrane module near the filter surface, and the multiple sewage outlets of the treatment tank are respectively connected to the drainage ports of adjacent sewage pipes.

[0006] Furthermore, two guide rods are symmetrically fixedly connected inside the processing box near the jet pipe, and two sliding sleeves are symmetrically fixedly connected to the jet pipe. The sliding sleeves are slidably connected to the guide rods. The jet nozzle of the jet head is tilted downwards towards the plate-and-frame membrane module, and an air supply pipe is fixedly connected to the air inlet of the jet pipe.

[0007] Furthermore, a gas box is fixedly connected to the bottom of the processing box, and an air pump for supplying gas into the gas box is fixedly connected to the lower side of one side of the processing box. The end of the gas supply pipe away from the jet pipe extends downward into the gas box, and the jet pipe and the gas box are connected by the gas supply pipe.

[0008] To further improve the cleaning effect on the plate and frame membrane module, a cleaning brush is further fixedly connected to the jet pipe at an angle below the jet head, and the cleaning end of the cleaning brush is in contact with the filter surface of the plate and frame membrane module.

[0009] To facilitate the inspection of the dirt and grime on the plate-and-frame membrane assembly, an observation window is further fixedly connected to the processing box.

[0010] To facilitate convenient replacement of the plate-and-frame membrane module, the upper end of the processing box is provided with an insertion port for use with the plate-and-frame membrane module, and a lifting handle is fixedly connected to the upper end of the plate-and-frame membrane module at the position where the insertion port is exposed.

[0011] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The plate and frame membrane module in the present invention can effectively intercept activated sludge and macromolecular organic matter, ensuring that the discharged water achieves a better purification effect, meeting the basic water quality requirements for reuse or discharge after sewage treatment, and helping the sewage treatment system to stably produce qualified purified water.

[0012] Traditional membrane bioreactors often require removing the membrane modules when cleaning them, which is cumbersome, time-consuming, and can easily damage the membrane modules. This device uses a pneumatic cleaning structure consisting of an air pump, jet pipe, and jet head to clean surface impurities without disassembling the plate and frame membrane modules, greatly simplifying the cleaning process and reducing labor and time costs.

[0013] The jet pipe moves up and down repeatedly, and the jet head tilts to spray air, which can perform all-round and dynamic cleaning of the surface of the plate and frame membrane module. Compared with traditional static cleaning methods (such as simple soaking and rinsing), it can remove attached impurities more thoroughly, reduce the impact of impurity residue on the water flow efficiency of the membrane module, ensure the continuous and efficient operation of the membrane module, extend the service life of the membrane module, and reduce the replacement frequency and cost of the membrane module.

[0014] During the cleaning process, there is no need to interrupt the overall operation of the wastewater treatment system. Only the operation of feeding water into the treatment tank needs to be paused for a short time. By reasonably arranging the cleaning time (such as during the off-peak period of wastewater treatment), the continuity of wastewater treatment can be guaranteed to a certain extent. This avoids the interruption of wastewater treatment caused by frequent deep cleaning of the membrane module, which may affect the wastewater discharge or reuse rhythm. It is especially suitable for scenarios with high requirements for the continuity of wastewater treatment, such as wastewater treatment in industrial continuous production and urban wastewater treatment plants.

[0015] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0016] In the attached diagram:

[0017] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the internal structure of the processing box of this utility model. Figure 1 ;

[0020] Figure 4 This is a schematic diagram of the internal structure of the processing box of this utility model. Figure 2 .

[0021] In the diagram: 1. Treatment tank; 101. Inlet pipe; 102. Outlet pipe; 103. Air pump; 104. Air box; 105. Observation window; 106. Sewage pipe; 2. Plate and frame membrane module; 201. Lifting handle; 3. Guide rod; 301. Jet pipe; 302. Jet head; 303. Air supply pipe; 304. Cleaning brush; 305. Sliding sleeve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0023] Example 1:

[0024] Reference Figures 1-4A membrane bioreactor for wastewater treatment includes a treatment tank 1, with an inlet pipe 101 and an outlet pipe 102 fixedly connected to the upper two sides of the treatment tank 1, respectively. It also includes: a plate-and-frame membrane module 2, vertically installed at equal intervals within the treatment tank 1 and located between the inlet pipe 101 and the outlet pipe 102; a jet pipe 301, vertically configurable within the treatment tank 1 and located on the side of the plate-and-frame membrane module 2 near the filter surface; jet nozzles 302, fixedly connected at equal intervals to the side of the jet pipe 301 near the plate-and-frame membrane module 2; and a drain pipe 106 with multiple inlet ports, fixedly connected to the lower end of one side of the treatment tank 1. The treatment tank 1 has a drain port on the side of the plate-and-frame membrane module 2 near the filter surface, and the multiple drain ports of the treatment tank 1 are respectively connected to the inlet ports of the adjacent drain pipe 106.

[0025] Two guide rods 3 are symmetrically fixedly connected inside the treatment box 1 near the jet pipe 301. Two sliding sleeves 305 are symmetrically fixedly connected on the jet pipe 301. The sliding sleeves 305 are slidably connected to the guide rods 3. The jet nozzle of the jet head 302 is tilted downwards towards the plate frame membrane module 2. An air supply pipe 303 is fixedly connected to the air inlet of the jet pipe 301.

[0026] A gas box 104 is fixedly connected to the bottom of the processing box 1. A gas pump 103 for supplying gas into the gas box 104 is fixedly connected to the lower side of one side of the processing box 1. The end of the gas supply pipe 303 away from the jet pipe 301 extends downward into the gas box 104. The jet pipe 301 and the gas box 104 are connected through the gas supply pipe 303.

[0027] When wastewater needs to be purified, pre-treated wastewater (with the removal of large particulate matter and other preliminary impurities) with a certain water pressure can be continuously injected into the treatment tank 1 through the inlet pipe 101. This pre-treatment step can reduce the burden on the subsequent membrane modules, allowing the membrane bioreactor to operate more efficiently and stably. After the wastewater enters the treatment tank 1, it flows through multiple plate and frame membrane modules 2 in sequence. During this process, the plate and frame membrane modules 2 play a retention role, and the activated sludge and large molecular organic matter in the wastewater are retained, realizing the separation of pollutants from water in the wastewater. The purified water is filtered through the plate and frame membrane modules 2, collected, and discharged from the treatment tank 1 through the outlet pipe 102, completing the wastewater purification.

[0028] When a large number of impurities adhere to the surface of the plate-and-frame membrane module 2, affecting the water flow efficiency (i.e., purification efficiency), the air pump 103 is activated. The air pump 103 delivers gas into the air box 104. The gas in the air box 104 is then delivered to multiple jet pipes 301 through the air supply pipe 303. Since the jet head 302 is tilted downwards, when the gas in the jet pipe 301 is ejected from the jet head 302, it will generate an upward thrust on the jet pipe 301, causing the jet pipe 301 to move upwards along the guide rod 3. When the jet pipe 301 moves to the top, the air supply pressure of the air pump 103 can be reduced. The jet pipe 301 moves downwards under its own gravity. By continuously adjusting the air supply pressure of the air pump 103, the jet pipe 301 can achieve up-and-down reciprocating movement. Since the jet nozzle of the jet head 302 faces the plate-and-frame membrane module 2, the ejected gas impacts the surface of the plate-and-frame membrane module 2, causing the attached impurities to detach from the surface of the membrane module.

[0029] After the impurities are removed, the valve on the drain pipe 106 is opened. The wastewater in the treatment tank 1, which contains the removed impurities, flows into the drain pipe 106 through the drain outlet and is eventually discharged from the treatment tank 1, restoring the inside of the treatment tank 1 to a relatively clean state and preparing it for the next round of wastewater purification or subsequent cleaning operations.

[0030] In the wastewater purification process, the plate and frame membrane module 2 can effectively retain activated sludge and macromolecular organic matter, ensuring that the discharged water achieves a good purification effect, meeting the basic water quality requirements for reuse or discharge after wastewater treatment, and helping the wastewater treatment system to stably produce qualified purified water.

[0031] Traditional membrane bioreactors often require removing the membrane modules when cleaning them, which is cumbersome, time-consuming, and can easily damage the membrane modules. This device uses a pneumatic cleaning structure consisting of an air pump 103, an air jet pipe 301, and an air jet head 302 to clean impurities on the surface of the plate and frame membrane module 2 without disassembling it, greatly simplifying the cleaning process and reducing labor and time costs.

[0032] The jet pipe 301 moves up and down repeatedly, and works in conjunction with the jet head 302 to spray air at an angle, which can perform all-round and dynamic cleaning of the surface of the plate and frame membrane module 2. Compared with traditional static cleaning methods (such as simple soaking and rinsing), it can remove attached impurities more thoroughly, reduce the impact of impurity residue on the water flow efficiency of the membrane module, ensure the continuous and efficient operation of the membrane module, extend the service life of the membrane module, and reduce the replacement frequency and cost of the membrane module.

[0033] During the cleaning process, there is no need to interrupt the overall operation of the wastewater treatment system. Only the operation of feeding water into treatment tank 1 needs to be paused for a short time. By reasonably arranging the cleaning time (such as during the off-peak period of wastewater treatment), the continuity of wastewater treatment can be guaranteed to a certain extent. This avoids the interruption of wastewater treatment caused by frequent deep cleaning of membrane modules, which may affect the wastewater discharge or reuse rhythm. It is especially suitable for scenarios with high requirements for the continuity of wastewater treatment, such as wastewater treatment in industrial continuous production and urban wastewater treatment plants.

[0034] Example 2:

[0035] Reference Figures 1-4 A membrane bioreactor for wastewater treatment is basically the same as in Example 1, but with a further improvement: a cleaning brush 304 is obliquely and fixedly connected to the jet pipe 301 below the jet head 302. The cleaning end of the cleaning brush 304 contacts the filter surface of the plate and frame membrane module 2. During the reciprocating movement of the jet pipe 301, the cleaning brush 304 can simultaneously perform physical cleaning on the surface of the plate and frame membrane module 2. This, combined with the impact of the gas ejected from the jet head 302, forms a synergistic cleaning mode. The gas impact can loosen and peel off impurities, while the cleaning brush 304 further removes residual dirt. Especially for stubborn and highly adhesive pollutants, it can enhance the cleaning effect, reduce the residue of impurities on the surface of the membrane module, slow down the membrane fouling rate, improve the comprehensiveness and thoroughness of cleaning, ensure the long-term stable water flow efficiency and purification capacity of the membrane module, extend the service life of the membrane module, and reduce the cost caused by frequent deep cleaning or replacement of the membrane module.

[0036] An observation window 105 is fixedly connected to the treatment box 1, allowing operators to visually observe the operating status of the plate-and-frame membrane module 2 inside the treatment box 1, such as the degree of impurity adhesion on the surface of the membrane module, the reciprocating movement of the jet pipe 301 and the cleaning brush 304, and the cleaning effect. This facilitates timely monitoring of the equipment's operating status, accurate judgment on whether to start the cleaning program and adjust the cleaning parameters, and also helps to observe the water flow status and sludge distribution during the wastewater purification process. This provides a visual basis for the operation and maintenance of the equipment, improves operational convenience and management efficiency, and reduces the risk of failure caused by the difficulty in timely detection of internal equipment abnormalities.

[0037] Example 3:

[0038] Reference Figures 1-4 A membrane bioreactor for wastewater treatment is basically the same as in Example 2, but further: the upper end of the treatment tank 1 is provided with an insertion port for use with the plate and frame membrane module 2, and a lifting handle 201 is fixedly connected to the position of the upper end of the plate and frame membrane module 2 where the insertion port is exposed.

[0039] When the plate and frame membrane module 2 needs in-depth inspection, replacement, or thorough cleaning (such as during regular comprehensive maintenance), the operator can easily pull the membrane module out from the insertion port using the lifting handle 201. This eliminates the need for complicated disassembly procedures, reducing the difficulty and labor intensity of membrane module disassembly and assembly. At the same time, the cooperation between the insertion port and the lifting handle 201 makes the installation and repositioning of the membrane module more convenient and accurate, ensuring equipment operation and maintenance efficiency, reducing the impact of excessive time spent on component disassembly and assembly on the continuous operation of wastewater treatment, and improving the overall maintainability and practicality of the equipment.

[0040] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model.

Claims

1. A membrane bioreactor for wastewater treatment, characterized in that, The treatment tank (1) includes an inlet pipe (101) and an outlet pipe (102) fixedly connected to its upper two sides, and further includes: The plate-and-frame membrane module (2) is installed vertically at equal intervals in the treatment box (1) and is located between the inlet pipe (101) and the outlet pipe (102); The jet pipe (301) is vertically mounted inside the treatment box (1) and located on the side of the plate and frame membrane assembly (2) near the filter surface; The jet head (302) is fixedly connected at equal intervals to the side of the jet pipe (301) near the plate and frame membrane module (2); A drain pipe (106) with multiple drainage ports is fixedly connected to the lower end of one side of the treatment box (1). The treatment box (1) is located on the side of the plate and frame membrane module (2) near the filter surface and has a drain port. The multiple drain ports of the treatment box (1) are respectively connected to the drainage ports of the adjacent drain pipe (106).

2. A membrane bioreactor for wastewater treatment according to claim 1, characterized in that, Two guide rods (3) are symmetrically fixedly connected inside the processing box (1) near the jet pipe (301). Two sliding sleeves (305) are symmetrically fixedly connected on the jet pipe (301). The sliding sleeves (305) are slidably connected to the guide rods (3). The jet nozzle (302) is tilted downwards towards the plate and frame membrane module (2). An air supply pipe (303) is fixedly connected to the air inlet of the jet pipe (301).

3. A membrane bioreactor for wastewater treatment according to claim 2, characterized in that, A gas box (104) is fixedly connected to the bottom of the processing box (1). A gas pump (103) for supplying gas to the gas box (104) is fixedly connected to the lower end of one side of the processing box (1). The end of the gas supply pipe (303) away from the jet pipe (301) extends downward into the gas box (104). The jet pipe (301) and the gas box (104) are connected through the gas supply pipe (303).

4. A membrane bioreactor for wastewater treatment according to claim 1, characterized in that, A cleaning brush (304) is fixedly and obliquely connected to the jet pipe (301) on the lower side of the jet head (302), and the cleaning end of the cleaning brush (304) is in contact with the filter surface of the plate and frame membrane module (2).

5. A membrane bioreactor for wastewater treatment according to claim 1, characterized in that, An observation window (105) is fixedly connected to the processing box (1).

6. A membrane bioreactor for wastewater treatment according to claim 1, characterized in that, The processing box (1) has an insertion port at the upper end for use with the plate and frame membrane module (2), and a lifting handle (201) is fixedly connected at the position of the plate and frame membrane module (2) where the insertion port is exposed.

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