Integrated built-in MBR membrane sewage treatment device

Abstract

The application discloses an integrated built-in MBR membrane sewage treatment device, which comprises a pretreatment unit, an anaerobic tank, an anoxic tank, an aerobic tank, a built-in MBR system and a deep treatment unit which are connected in sequence; the pretreatment unit removes oil and large-particle SS in sewage; the anaerobic tank decomposes refractory macromolecular organic matters to improve the biodegradability of sewage; the anoxic tank (DO<=0.5mg / L) realizes denitrification; the aerobic tank (DO=2-4mg / L) degrades organic carbon, converts ammonia nitrogen and enriches phosphorus; the built-in MBR system realizes solid-liquid separation by intercepting sludge through an ultrafiltration membrane; and the deep treatment unit disinfects and adsorbs MBR effluent; after sewage is purified by the device stage by stage, various indexes reach the first-level standard, and the problems of low sewage treatment efficiency and unstable effluent can be solved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a built-in MBR membrane wastewater treatment device. Background Technology

[0002] With the rapid development of industry and urbanization, the amount of wastewater discharged is increasing year by year, placing higher demands on the efficiency and stability of wastewater treatment technologies. Membrane bioreactors (MBRs), as a highly efficient wastewater treatment technology, combine biological treatment and membrane separation functions, and have advantages such as good effluent quality and small footprint.

[0003] In the prior art, such as the patent no. CN203613066U "A process device for preventing clogging of built-in MBR tubular membranes", a wastewater treatment system including a denitrification tank, a nitrification tank, and a tubular membrane module is disclosed. This system alleviates clogging by adding a vertical flow sedimentation tank to intercept activated sludge and reduce the load on the membrane module. However, this device has the following shortcomings: it lacks a targeted pretreatment unit, cannot remove oil and large particulate impurities from the wastewater, easily leads to membrane fouling, has limited nitrogen and phosphorus removal efficiency, high operation and maintenance costs, and poor adaptability to low-temperature environments, making it difficult to meet the high-efficiency treatment needs of complex wastewater.

[0004] Therefore, it is of great significance to develop a built-in MBR membrane wastewater treatment device with a high degree of integration, precise automated control, and convenient membrane module maintenance. Summary of the Invention

[0005] This utility model aims to solve one of the technical problems existing in the prior art.

[0006] This application provides an integrated built-in MBR membrane wastewater treatment device, comprising a pretreatment unit, an anaerobic tank, an anoxic tank, an aerobic tank, a built-in MBR system, and a deep treatment unit connected in series. The pretreatment unit is used to remove oil and large particulate solids (SS) from the wastewater. The built-in MBR system is used for solid-liquid separation. The deep treatment unit is used to disinfect and adsorb the effluent from the MBR membrane system, so that the wastewater meets the discharge standards.

[0007] The pretreatment unit includes an oil separator, a septic tank, and a collection tank connected in sequence. The collection tank is equipped with a lift pump, which is used to transport the sewage in the collection tank to the anaerobic tank.

[0008] It also includes an aeration device to maintain the dissolved oxygen concentration in the aerobic tank at DO=2-4mg / L.

[0009] The aeration device includes a blower and several aeration heads, each of which is installed in the aerobic tank, and the air outlet of the blower is connected to each aeration head through a pipe.

[0010] It also includes PLC controllers, computers and communication equipment. The analog and digital signals of all equipment are centrally controlled and displayed in the control room to realize automatic operation of the equipment.

[0011] The built-in MBR system includes a bag filter, an ultrafiltration feed pump, and a tubular ultrafiltration unit connected in series.

[0012] The tubular ultrafiltration unit comprises several types, with the front end of each tubular ultrafiltration unit connected to the outlet end of the ultrafiltration inlet pump, and the rear end of each tubular ultrafiltration unit connected to the aerobic tank or the advanced treatment unit.

[0013] It also includes a cleaning water tank and a chemical washing water tank; the inlet ends of the cleaning water tank and the chemical washing water tank are respectively connected to the filter end of the tubular ultrafiltration unit and the aerobic tank, and both the cleaning water tank and the chemical washing water tank are provided with a water inlet for connecting to an external tap water pipe. Both the cleaning water tank and the chemical washing water tank are provided with a low-level switch for monitoring the liquid level; the outlet ends of the cleaning water tank and the chemical washing water tank are connected to the inlet end of the bag filter, and the filter end of the tubular ultrafiltration unit and the cleaning water tank and the chemical washing water tank are all connected to the collection tank through a bypass pipeline.

[0014] The anaerobic tank is equipped with a reflux port at the top, which is connected to the pretreatment unit through a reflux pipe.

[0015] It also includes an integrated oil-water separator housing made of carbon steel with a heat insulation layer, wherein the anaerobic tank, anoxic tank, aerobic tank and built-in MBR system are all placed in the integrated oil-water separator housing.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. High treatment efficiency: Through a series of processes including "pretreatment-anaerobic-anoxic-aerobic-MBR-deep treatment", the system achieves synergistic treatment of organic matter degradation, nitrogen and phosphorus removal and solid-liquid separation, and the effluent quality meets the first-class standard.

[0018] 2. High degree of automation: The PLC control system enables real-time parameter monitoring, equipment linkage, and fault alarms, reducing manual intervention;

[0019] 3. Easy maintenance: The built-in MBR system is equipped with an automatic cleaning function, which effectively prevents membrane clogging and extends the life of the membrane module;

[0020] 4. High integration: The integrated shell reduces the footprint, and the thermal insulation design ensures stable operation in low-temperature environments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the integrated built-in MBR membrane wastewater treatment device in the embodiments of this application;

[0022] Figure 2This is a schematic diagram of the built-in MBR system in an embodiment of this application.

[0023] Figure Labels

[0024] 1-Pretreatment unit, 101-Oil separator unit, 102-Septic tank, 103-Collection tank, 2-Anaerobic tank, 3-Anoxic tank, 4-Aerobic tank, 5-Built-in MBR system, 501-Bag filter, 502-Ultrafiltration inlet pump, 503-Tube filter, 6-Deep treatment unit, 7-Aeration device, 701-Blower, 702-Aeration head, 8-Cleaning water tank, 9-Chemical washing water tank, 10-Integrated oil separator housing. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0026] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] The integrated built-in MBR membrane wastewater treatment device provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0028] Example 1:

[0029] This application provides an integrated built-in MBR membrane wastewater treatment device, including a pretreatment unit 1, an anaerobic tank 2, an anoxic tank 3, an aerobic tank 4, a built-in MBR system 5, and a deep treatment unit 6 connected in series. The pretreatment unit 1 is used to remove oil and large particulate solids (SS) from the wastewater. The built-in MBR system 5 is used for solid-liquid separation. The deep treatment unit 6 is used to disinfect and adsorb the effluent from the MBR membrane system so that the wastewater meets the discharge standards.

[0030] like Figures 1 to 2As shown, due to the above structure, wastewater can be purified step by step along a series process of "pretreatment unit 1 → anaerobic tank 2 → anoxic tank 3 → aerobic tank 4 → built-in MBR system 5 → deep treatment unit 6": First, the wastewater to be treated enters pretreatment unit 1, where oil and large particulate suspended solids (SS) are removed from the water through an oil separator and septic tank to prevent clogging of subsequent equipment. Then, it is pumped to anaerobic tank 2 by lift pump 104. In anaerobic tank 2, anaerobic bacteria decompose recalcitrant large organic molecules into small organic acids, reducing CODcr concentration and improving the biodegradability of the wastewater, laying the foundation for aerobic treatment. Next, the wastewater flows into anoxic tank 3 (DO... (≤0.5mg / L) Denitrifying bacteria use residual organic carbon as a carbon source to reduce nitrate ions returned from aerobic tank 4 to nitrogen gas, thus achieving denitrification; then it enters aerobic tank 4 (DO=2-4mg / L), where aerobic microorganisms oxidize organic carbon to CO2 and H2O, nitrifying bacteria convert ammonia nitrogen into nitrate ions, and phosphorus-absorbing microorganisms enrich phosphorus and discharge it with sludge; subsequently, the mixed liquor from aerobic tank 4 enters the built-in MBR system 5, where activated sludge and suspended particles are intercepted through an ultrafiltration membrane with a pore size of 0.04μm, achieving solid-liquid separation; finally, the MBR effluent is disinfected and adsorbed by the deep treatment unit 6, and all indicators meet the first-class standard, achieving compliant discharge.

[0031] Example 2:

[0032] In this embodiment, in addition to the structural features of the aforementioned embodiments, the pretreatment unit 1 includes an oil separator 101, a septic tank 102 and a collection tank 103 connected in sequence. The collection tank 103 is equipped with a lift pump 104, which is used to transport the sewage in the collection tank 103 to the anaerobic tank 2.

[0033] like Figures 1 to 2 As shown, due to the above structure, the pretreatment unit 1 achieves efficient pretreatment through the collaboration of "oil separator 101 → septic tank 102 → collection tank 103 + lift pump 104": the sewage first enters the integrated oil separator, which is made of corrosion-resistant material and can intercept floating oil and disperse oil and discharge oil periodically; then the sewage flows into the finished septic tank 102, which is made of corrosion-resistant material (e.g., φ1300×1500 is suitable for 2.00m³ / d treatment capacity, φ2000×2800 is suitable for 7.00m³ / d treatment capacity), which intercepts fecal sludge and suspended particles through graded sedimentation, while anaerobic microorganisms initially degrade organic matter; the pretreated sewage flows into the finished collection tank, and the lift pump 104 in the tank (specifications 2m³ / h, 10m head, 0.37kw, with float level) automatically starts and stops according to the liquid level, stably transporting the sewage to the anaerobic tank 2, avoiding water accumulation, overflow or interruption, and ensuring the continuity of the process.

[0034] Example 3:

[0035] In this embodiment, in addition to the structural features of the aforementioned embodiments, an aeration device 7 is also included to maintain the dissolved oxygen concentration of the aerobic tank 4 at DO=2-4mg / L.

[0036] In this embodiment of the application, the aeration device 7 includes a blower 701 and a plurality of aeration heads 702. Each aeration head 702 is disposed in the aerobic tank 4, and the air outlet of the blower 701 is connected to each aeration head 702 through a pipe.

[0037] like Figures 1 to 2 As shown, due to the above structure, compressed air is delivered by the blower 701 and released into bubbles through the aeration head 702, which fully contact the wastewater, so that the dissolved oxygen concentration in the aerobic tank 4 is stably maintained at 2-4 mg / L, which meets the metabolic needs of aerobic microorganisms (such as nitrifying bacteria and heterotrophic bacteria) in the tank. Nitrifying bacteria can convert ammonia nitrogen into nitrate in this environment, while heterotrophic bacteria oxidize the remaining organic carbon into CO2 and H2O, while providing energy for phosphorus-absorbing microorganisms to achieve phosphorus enrichment, ultimately ensuring the effective removal of organic matter, ammonia nitrogen and phosphorus in the aerobic treatment stage.

[0038] Example 4:

[0039] In this embodiment, in addition to the structural features of the aforementioned embodiments, it also includes a PLC controller, a computer, and communication equipment. The analog and digital signals of all devices are centrally controlled and displayed in the control room to achieve automatic operation of the equipment.

[0040] like Figures 1 to 2 As shown, due to the above structure, the system operates automatically through "PLC controller + computer + communication equipment": The system is configured with a PLC controller (such as S7-200 or FX series), a monitoring computer (Lenovo 3.0G, 8GDDR, 2TG), and communication equipment such as network switches. The analog and digital signals of all devices are centrally controlled and displayed in the control room. The PLC controller collects real-time data and equipment status signals from field instruments (such as level controllers and electromagnetic flowmeters) through wired I / O interfaces, and communicates with the host computer via the MODBUS industrial network to realize process control, sequential control, and automatic equipment operation. The monitoring computer can display the process flow, process parameters, equipment status, etc., and print daily and weekly reports on a regular basis. It also has a fault alarm function, which can promptly indicate abnormalities and trigger protection actions. This automatic control system does not require real-time manual supervision, reducing operational intensity and ensuring stable system operation.

[0041] Example 5:

[0042] In this embodiment, in addition to the structural features of the aforementioned embodiments, the built-in MBR system 5 includes a bag filter 501, an ultrafiltration feed pump 502, and a tubular ultrafiltration unit connected in series.

[0043] In this embodiment of the application, there are several tubular ultrafilters 503. The front end of each tubular ultrafilter 503 is connected to the outlet end of the ultrafiltration water pump 502, and the rear end of each tubular ultrafilter 503 is connected to the aerobic tank 4 or the deep treatment unit 6.

[0044] In this embodiment of the application, a cleaning water tank 8 and a chemical washing water tank 9 are also included. The inlet ends of the cleaning water tank 8 and the chemical washing water tank 9 are respectively connected to the filter end of the tubular ultrafiltration 503 and the aerobic tank 4. Both the cleaning water tank 8 and the chemical washing water tank 9 are provided with a water inlet for connecting to an external tap water pipe. Both the cleaning water tank 8 and the chemical washing water tank 9 are provided with a low-level switch for monitoring the liquid level. The outlet ends of the cleaning water tank 8 and the chemical washing water tank 9 are connected to the inlet end of the bag filter 501. The filter end of the tubular ultrafiltration 503 and the cleaning water tank 8 and the chemical washing water tank 9 are all connected to the collection tank 103 through a bypass pipeline.

[0045] like Figures 1 to 2 As shown, due to the above-mentioned structure, the built-in MBR system 5 achieves efficient solid-liquid separation and stable operation: the built-in MBR system 5 is connected to the aerobic tank 4 and the advanced treatment unit 6, and its core is the ultrafiltration membrane module (pore size 0.04μm), which can intercept activated sludge and suspended particles, significantly reducing the SS concentration in the MBR effluent and laying the foundation for advanced treatment; the number of tubular ultrafilters 503 is adapted to the treatment capacity, and the front end of each tubular ultrafilter 503 is connected to the ultrafiltration feed pump 502, and the back end can be connected to the aerobic tank 4 (sludge return) or the advanced treatment unit 6 (clean water discharge) as needed; the system's cleaning and chemical cleaning functions can achieve membrane module cleaning through reasonable pipeline design based on the process requirement that MBR membranes need to be maintained regularly, avoiding membrane pore blockage, extending membrane life, and ensuring long-term stable operation of the system.

[0046] Cleaning water tank 8: water inlet and water replenishment

[0047] Prioritize the use of process water: When the tubular ultrafiltration unit 503 is operating normally, its filter back end (i.e., the qualified clean water after ultrafiltration treatment) continuously replenishes water to the cleaning water tank 8 through a dedicated pipeline. This not only reuses process water and reduces tap water consumption, but also ensures stable cleaning water quality (low turbidity, few impurities, and avoids contamination of membrane modules during cleaning).

[0048] Tap water replenishment: The low-level switch inside the cleaning water tank 8 monitors the liquid level in real time. When the liquid level is lower than the set value (such as 20% of the water tank volume), the low-level switch triggers a signal to automatically open the solenoid valve of the water inlet connected to the external tap water pipe on the water tank, replenishing tap water until the liquid level is higher than the low-level switch (such as 50% of the water tank volume). The solenoid valve then closes, ensuring that the water tank always retains the minimum starting water volume (to prevent the ultrafiltration inlet pump 502 from running dry).

[0049] Medicated wash water tank 9 water inlet and replenishment

[0050] Process water source access: The effluent from aerobic tank 4 (after biochemical treatment, COD and SS have been significantly reduced, and the water quality is relatively stable) is connected to the chemical washing tank 9 through pipelines as the "basic carrier water" during chemical washing (which can be used to dilute the chemicals and reduce the corrosiveness of the chemicals directly contacting the membrane modules).

[0051] Emergency tap water replenishment: Similar to the cleaning water tank 8, the low-level switch of the medicated water tank 9 monitors the liquid level. When the liquid level is lower than the set value, it triggers the solenoid valve of the tap water inlet to open. After replenishing water until the liquid level reaches the standard, it closes to ensure sufficient water supply during medicated washing.

[0052] Normal wastewater treatment operation: Tank standby and process continuity logic

[0053] When the entire wastewater treatment system is in normal operation (no cleaning / chemical cleaning required):

[0054] Water tank status: The outlet valves (connected to the inlet of bag filter 501) of cleaning water tank 8 and chemical washing water tank 9 are closed, and the water tanks are in "water storage standby" state. The low-level switch continuously monitors the liquid level to maintain the minimum water volume.

[0055] Process water flow direction: After pretreatment (oil separator / septic tank 102) → collection tank 103 → anaerobic tank 2 → anoxic tank 3 → aerobic tank 4, the wastewater directly enters the bag filter 501 (removing residual suspended solids) through the main pipeline, and then enters the tubular ultrafilter 503 (deeply intercepting colloids and small molecule organic matter). After the tubular ultrafilter 503 filters, the water flows to the subsequent MBR / deep treatment unit 6.

[0056] Bypass pipelines are idle: the valves of the bypass pipelines connecting the downstream end of the tubular ultrafiltration unit 503, the cleaning water tank 8, the chemical washing water tank 9, and the collection tank 103 are all closed to prevent short-circuit backflow of process water.

[0057] Physical cleaning operation: Cleaning operation logic for tubular ultrafiltration 503 / bag filter 501

[0058] When the flux of the tubular ultrafilter 503 decreases (e.g., below 80% of the design value) or the transmembrane pressure difference increases (e.g., above 0.15 MPa), or the inlet and outlet pressure difference of the bag filter 501 exceeds the standard, the physical cleaning process shall be initiated:

[0059] Cleaning trigger condition confirmation: The system PLC receives the differential pressure sensor signal from the tubular ultrafilter 503 / bag filter 501, or a cleaning command is manually triggered.

[0060] Switching the cleaning water source: Close the main inlet valve of the aerobic tank 4 to the bag filter 501, open the outlet valve of the cleaning water tank 8, and start the ultrafiltration inlet pump 502 (matched to the outlet of the cleaning water tank 8).

[0061] Cleaning water flow direction: Clean water in cleaning water tank 8 (ultrafiltration reprocessing water + tap water replenishment) → bag filter 501 inlet (clean the filter media of bag filter 501 first to avoid impurities being carried into the ultrafiltration) → ultrafiltration inlet pump 502 → tubular ultrafiltration 503 inlet, the water flow washes away impurities on the membrane surface along the normal filtration direction.

[0062] Wastewater return after cleaning: The wastewater after cleaning (including stripped impurities and suspended solids) is returned to the collection tank 103 through "tubular ultrafiltration 503 filter end → bypass pipeline" or "cleaning water tank 8 → bypass pipeline" to re-enter the pretreatment process and avoid direct discharge that could cause pollution.

[0063] Cleaning stop conditions: When the flux of the tubular ultrafiltration membrane 503 recovers to more than 90% of the design value, the transmembrane pressure difference drops to below 0.1 MPa, or the cleaning time reaches the set value (e.g., 30 minutes), the system will automatically stop the ultrafiltration feed water pump 502, close the outlet valve of the cleaning water tank 8, open the main inlet valve from the aerobic tank 4 to the bag filter 501, and resume normal process operation.

[0064] Chemical cleaning operation: Operating logic for chemical cleaning of tubular ultrafilters with severe 503 fouling.

[0065] If the flux / differential pressure of the tubular ultrafiltration unit 503 still fails to meet the standards after physical cleaning (e.g., irreversible fouling occurs on the membrane surface, such as organic scale or microbial membranes), initiate the chemical cleaning process:

[0066] Preparation before chemical washing: Manually add the corresponding type of chemical agent (such as citric acid solution for removing organic scale, sodium hypochlorite solution for removing microbial film) into the chemical washing tank 9. The chemical agent is thoroughly mixed with the effluent / tap water from the aerobic pool 4 in the chemical washing tank 9 (the mixing concentration is set according to the type of pollution, such as 1%-3% citric acid solution).

[0067] Chemical washing trigger and water source switching: Close the main inlet valve of aerobic tank 4 to bag filter 501, open the outlet valve of chemical washing water tank 9, and start the chemical washing pump;

[0068] The flow of the washing water is as follows: the chemical mixture in the washing water tank 9 → bag filter 501 (to clean the filter media of residual impurities and avoid affecting the washing effect) → ultrafiltration water pump 502 → tubular ultrafiltration 503 inlet (the chemical mixture is soaked in the tubular ultrafiltration 503 for 1-2 hours to ensure that the chemicals and contaminants react fully).

[0069] Chemical washing waste liquid treatment: After chemical washing is completed, first open the bypass pipeline valve from chemical washing water tank 9 to collection tank 103 to return the chemical washing waste liquid (including reacted agents and pollutants) to collection tank 103 (to degrade the agent residue through the biochemical system); then open the outlet valve of cleaning water tank 8 to rinse the tubular ultrafilter 503 and bag filter 501 with clean water (to remove residual agents and avoid affecting subsequent processes), and the rinsing waste liquid is also returned to collection tank 103 through the bypass pipeline;

[0070] Recovery after chemical washing: After rinsing, close the outlet valve of chemical washing / cleaning water tank 8, open the main inlet valve of aerobic tank 4 to bag filter 501, and the system will return to normal sewage treatment conditions. Monitor whether the flow rate / differential pressure of tubular ultrafilter 503 meets the standards.

[0071] Example 6:

[0072] In this embodiment, in addition to the structural features of the aforementioned embodiments, the anaerobic tank 2 is provided with a reflux port at the top, and the reflux port is connected to the pretreatment unit 1 through a reflux pipe.

[0073] like Figures 1 to 2 As shown, due to the above-mentioned structure, the top return port of anaerobic tank 2 is connected to the return pipe of pretreatment unit 1, which can enhance the synergistic effect of pretreatment and anaerobic treatment: the return pipe can return the hydrolyzed and acidified mixed liquor (containing active hydrolyzing bacteria and small molecule organic acids) in anaerobic tank 2 to the collection tank 103 of pretreatment unit 1. The hydrolyzing bacteria can accelerate the decomposition of the remaining recalcitrant organic matter in collection tank 103 and improve the biodegradability of wastewater (BOD5 / CODcr ratio); at the same time, the small molecule organic acids in the mixed liquor can supplement the carbon source of pretreatment unit 1, providing sufficient carbon source for subsequent denitrification in anoxic tank 3 and reducing the need for additional carbon source addition; the return pipe can be flexibly designed in conjunction with process pipelines (such as setting electric valves) to adjust the return flow rate according to the COD removal rate of anaerobic tank 2, ensuring synergistic efficiency and reducing the load on subsequent treatment.

[0074] Example 7:

[0075] In this embodiment, in addition to the structural features of the aforementioned embodiments, it also includes an integrated oil separator housing 9 made of carbon steel and equipped with a heat insulation layer. The anaerobic tank 2, the anoxic tank 3, the aerobic tank 4, and the built-in MBR system 5 are all placed in the integrated oil separator housing 9.

[0076] like Figures 1 to 2As shown, due to the above-mentioned structure, the integrated oil separator shell 9 made of carbon steel with an insulation layer can achieve the integration of core treatment units and improve environmental adaptability: the shell is made of carbon steel and is treated with anti-corrosion to resist the corrosion of oil and organic acids in sewage, avoid shell rust, and extend equipment life. At the same time, some areas (such as oil separator and integrated equipment) adopt a special steel structure with anti-corrosion to adapt to the corrosive environment of sewage treatment. The outer side of the shell is wrapped with an insulation layer, which can reduce the impact of low temperature in winter on the environment inside the tank, prevent sewage from freezing and damaging the equipment, and maintain the appropriate temperature of anaerobic tank 2 (15-35℃) and aerobic tank 4 (20-30℃) to ensure microbial activity. The shell integrates anaerobic tank 2, anoxic tank 3, aerobic tank 4 and built-in MBR system 5. Each unit is connected by built-in guide plates to shorten the sewage transportation distance and reduce head loss. Moreover, the integrated structure occupies only 1 / 3 to 1 / 2 of the area of ​​traditional decentralized structures, which is suitable for site-limited requirements.

[0077] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0078] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An integrated built-in MBR membrane wastewater treatment device, characterized in that, It includes a pretreatment unit, an anaerobic tank, an anoxic tank, an aerobic tank, an internal MBR system, and a deep treatment unit connected in series. The pretreatment unit is used to remove oil and large particulate solids (SS) from the wastewater. The internal MBR system is used for solid-liquid separation. The deep treatment unit is used to disinfect and adsorb the effluent from the MBR membrane system to ensure that the wastewater meets discharge standards.

2. The integrated built-in MBR membrane wastewater treatment device according to claim 1, characterized in that, The pretreatment unit includes an oil separator, a septic tank, and a collection tank connected in sequence. The collection tank is equipped with a lift pump, which is used to transport the sewage in the collection tank to the anaerobic tank.

3. The integrated built-in MBR membrane wastewater treatment device according to claim 1, characterized in that, It also includes an aeration device to maintain the dissolved oxygen concentration in the aerobic tank at DO=2-4mg / L.

4. The integrated built-in MBR membrane wastewater treatment device according to claim 3, characterized in that, The aeration device includes a blower and several aeration heads, each of which is installed in the aerobic tank, and the air outlet of the blower is connected to each aeration head through a pipe.

5. The integrated built-in MBR membrane wastewater treatment device according to claim 1, characterized in that, It also includes PLC controllers, computers and communication equipment. The analog and digital signals of all equipment are centrally controlled and displayed in the control room to realize automatic operation of the equipment.

6. The integrated built-in MBR membrane wastewater treatment device according to claim 1, characterized in that, The built-in MBR system includes a bag filter, an ultrafiltration feed pump, and a tubular ultrafiltration unit connected in series.

7. The integrated built-in MBR membrane wastewater treatment device according to claim 6, characterized in that, The tubular ultrafiltration unit comprises several types, with the front end of each tubular ultrafiltration unit connected to the outlet end of the ultrafiltration inlet pump, and the rear end of each tubular ultrafiltration unit connected to the aerobic tank or the advanced treatment unit.

8. The integrated built-in MBR membrane wastewater treatment device according to claim 7, characterized in that, It also includes a cleaning water tank and a chemical washing water tank; the inlet ends of the cleaning water tank and the chemical washing water tank are respectively connected to the filter end of the tubular ultrafiltration unit and the aerobic tank, and both the cleaning water tank and the chemical washing water tank are provided with a water inlet for connecting to an external tap water pipe. Both the cleaning water tank and the chemical washing water tank are provided with a low-level switch for monitoring the liquid level; the outlet ends of the cleaning water tank and the chemical washing water tank are connected to the inlet end of the bag filter, and the filter end of the tubular ultrafiltration unit and the cleaning water tank and the chemical washing water tank are all connected to the collection tank through a bypass pipeline.

9. The integrated built-in MBR membrane wastewater treatment device according to claim 1, characterized in that, The anaerobic tank is equipped with a reflux port at the top, which is connected to the pretreatment unit through a reflux pipe.

10. An integrated built-in MBR membrane wastewater treatment device according to claim 1, characterized in that, It also includes an integrated oil-water separator housing made of carbon steel with a heat insulation layer, wherein the anaerobic tank, anoxic tank, aerobic tank and built-in MBR system are all placed in the integrated oil-water separator housing.

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