Domestic sewage integrated treatment equipment

Abstract

The utility model relates to the technical field of sewage purification, in particular to integrated treatment equipment for domestic sewage. Comprising wastewater pretreatment equipment, the wastewater pretreatment equipment comprises a treatment bin communicated with a blending pool, a grating is arranged in the treatment bin, a chain plate type conveying belt is arranged in the treatment bin, a scraper is mounted on each chain plate of the chain plate type conveying belt, and the scrapers abut against the surface of the grating; an inclined floating object conveying belt is arranged on the side of the chain plate type conveying belt in the treatment bin, a sinking groove is formed in the side of the grating in the treatment bin, the lower end of the floating object conveying belt is arranged in the sinking groove, an inclined screen bin is installed at the upper end of the floating object conveying belt, a filter screen is arranged on the bottom wall of the screen bin, a collecting bin is installed at the bottom end of the screen bin in parallel, and the bottom end of the collecting bin is communicated with the blending pool. Garbage can be cleaned, and the situation that the water purification process is affected due to grid blockage is prevented; and the separated garbage can be subjected to water control again, so that waste water residues are avoided.

Description

Technical Field

[0001] This application relates to the field of wastewater purification technology, and in particular to an integrated domestic wastewater treatment device. Background Technology

[0002] In daily life, flushing toilets, bathing, cooking and other activities generate various kinds of wastewater, which is then collected in water treatment plants for centralized treatment.

[0003] Wastewater treatment mainly involves the following steps: pretreatment using physical measures such as screens to remove visible floating debris; adjustment of water quality and output volume; biological contact oxidation treatment using microorganisms to degrade complex macromolecules in the wastewater; settling tanks for sludge sedimentation; collection and disinfection of the clarified liquid in the settling tanks; and collection and dewatering of the sludge in the settling tanks. This forms a complete treatment process. However, it is important to note that during wastewater treatment, especially in the anaerobic treatment stage involving microbial degradation, a large amount of methane is produced, generating foul odors. If not treated promptly, this will not only affect the health of workers but also pollute the water treatment plant environment. Furthermore, in the pretreatment stage, most screens are installed in screen wells, which are prone to clogging by suspended solids. This not only affects wastewater transport and purification efficiency but also, over time, exacerbates water contamination.

[0004] Therefore, this application provides an integrated domestic sewage treatment device that cleans the screen to prevent clogging. Utility Model Content

[0005] The purpose of this application is to propose an integrated domestic sewage treatment device to solve the problems existing in the prior art.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] An integrated domestic sewage treatment device includes a wastewater pretreatment device, a mixing tank, a biological contact oxidation tank, a sedimentation tank, and a disinfection tank connected in sequence; the bottom of the sedimentation tank is connected to a dewatering chamber, and the upper port of the dewatering chamber is connected to the mixing tank.

[0008] The biological contact oxidation tank includes an anaerobic tank, an anoxic tank, and an aerobic tank in sequence, and each of the anaerobic tank, anoxic tank, and aerobic tank is equipped with an aeration device.

[0009] The wastewater pretreatment equipment includes a treatment chamber connected to the mixing tank. The treatment chamber contains a screen and a chain conveyor belt. Each chain plate of the chain conveyor belt is equipped with a scraper that rests against the screen surface. An inclined floating material conveyor belt is located beside the chain conveyor belt within the treatment chamber. A settling trough is located beside the screen within the treatment chamber. The lower end of the floating material conveyor belt is positioned within the settling trough, and an inclined screen chamber is installed at its upper end. The bottom wall of the screen chamber is a filter screen. A collection chamber is installed parallel to the bottom of the screen chamber, and the bottom of the collection chamber is connected to the mixing tank.

[0010] Preferably, the gas introduced into the aeration device in the anaerobic tank is oxygen-free.

[0011] Preferably, the grid is inclined, and the scraper is wedge-shaped with the wedge-shaped surface abutting against the grid surface.

[0012] Preferably, the processing chamber is divided into a water storage chamber and a water injection chamber by a grid, the water storage chamber is connected to the mixing tank, and the chain conveyor belt is located in the water injection chamber.

[0013] Preferably, the bottom of the water storage tank is connected to the top of the mixing tank, the bottom of the mixing tank is connected to the top of the anaerobic tank, the bottom of the anaerobic tank is connected to the bottom of the anoxic tank, the top of the anoxic tank is connected to the bottom of the aerobic tank, and the top of the aerobic tank is connected to the top of the sedimentation tank.

[0014] Preferably, a partition is provided in the sedimentation tank at the part that connects with the aerobic tank.

[0015] Compared with the prior art, this application provides an integrated domestic sewage treatment device, which has the following beneficial effects:

[0016] 1. During water purification, a screen traps visible suspended solids in the wastewater, which is then fed into a mixing tank for further processing. The mixed wastewater then enters an anaerobic tank, where complex macromolecules are broken down into smaller, more easily digestible molecules. The anaerobic wastewater is then fed into an anoxic tank for nitrification and denitrification to remove nitrogenous pollutants. Afterward, the wastewater is fed into an aerobic tank where, in the presence of free oxygen, aerobic microorganisms degrade organic matter, rendering it harmless and stable. The biochemically treated water is then disinfected after sedimentation to meet drinking water standards. The sludge, after sedimentation, is fed into a dewatering chamber for further processing. The dewatered sludge forms sludge cakes that can be recycled, for example, as fertilizer or to improve soil. This maximizes resource utilization and saves on water treatment costs when sold externally.

[0017] 2. During operation, the chain conveyor belt runs continuously. Visible floating debris trapped by the screen in the treatment chamber is dislodged by scrapers and falls into the settling trough, then conveyed to the screening chamber by the floating debris conveyor belt. The waste moves down the inclined filter screen at the bottom of the screening chamber. During this movement, residual wastewater on the waste flows through the filter screen into the collection chamber, and then flows through pipe six into the mixing tank for purification. Wastewater flowing into the settling trough also flows through pipe seven into pipe six and enters the mixing tank. This process effectively removes waste, preventing screen blockage and ensuring the water purification process is not affected; it also allows for further water control of the separated waste, preventing wastewater residue.

[0018] Other advantages, objectives and features of this application will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be learned from practice of this application. Attached Figure Description

[0019] Figure 1 This is a simplified schematic diagram of the wastewater treatment system of this application.

[0020] Figure 2 For the purposes of this application Figure 1 Schematic diagram of the cross section at point AA.

[0021] Figure 3 This is a schematic diagram of the assembly structure of the processing chamber and screening chamber in this application.

[0022] Figure 4 This is a schematic diagram of the assembly structure of the processing compartment in this application.

[0023] Figure 5 For the purposes of this application Figure 4 A schematic diagram of the cross-section of the screen compartment.

[0024] Figure 6 This is a process flow diagram of the wastewater treatment system of this application.

[0025] Figure 7 This is a cross-sectional schematic diagram of the preprocessing equipment used in this application.

[0026] In the diagram: 1. Pretreatment equipment; 2. Mixing tank; 3. Anaerobic tank; 4. Anoxic tank; 5. Aerobic tank; 6. Sedimentation tank; 7. Disinfection tank; 8. Dewatering chamber; 9. Aeration device; 101. Treatment chamber; 102. Bar screen; 103. Chain conveyor belt; 104. Scraper; 105. Floating matter conveyor belt; 106. Screening chamber; 107. Collection chamber; 108. Settling trough; 1011. Water injection chamber; 1012. Water storage chamber. Detailed Implementation

[0027] The following will refer to the appendices in the embodiments of this application. Figure 1-7The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0028] To address the problems existing in the prior art, this embodiment provides an integrated domestic sewage treatment device, including a wastewater pretreatment device 1, a mixing tank 2, a biological contact oxidation tank, a sedimentation tank 6, and a disinfection tank 7 connected in sequence; the bottom end of the sedimentation tank 6 is connected to a dewatering chamber 8, and the upper port of the dewatering chamber 8 is connected to the mixing tank 2.

[0029] The biological contact oxidation tank includes an anaerobic tank 3, an anoxic tank 4, and an aerobic tank 5 in sequence. Each of the anaerobic tank 3, anoxic tank 4, and aerobic tank 5 is equipped with an aeration device 9.

[0030] The wastewater pretreatment equipment 1 includes a treatment chamber 101 connected to the mixing tank 2. A grid 102 is provided at the connection between the treatment chamber 101 and the mixing tank 2. A chain conveyor belt 103 is provided inside the treatment chamber 101. Each chain plate of the chain conveyor belt 103 is equipped with a scraper 104, which abuts against the surface of the grid 102. The equipment also includes an inclined floating material conveyor belt 105. A settling trough 108 is provided inside the treatment chamber 101 on the side of the grid 102. The lower end of the floating material conveyor belt 105 is located in the settling trough 108, and the upper end is equipped with an inclined screen chamber 106. The bottom wall of the screen chamber 106 is a filter screen. A collection chamber 107 is installed parallel to the bottom of the screen chamber 106, and the bottom end of the collection chamber 107 is connected to the mixing tank 2.

[0031] Principle details of this embodiment:

[0032] An integrated domestic sewage treatment device includes a wastewater pretreatment device 1, a mixing tank 2, a biological contact oxidation tank, a sedimentation tank 6, a disinfection tank 7, and a dewatering chamber 8; the biological contact oxidation tank includes an anaerobic tank 3, an anoxic tank 4, and an aerobic tank 5. The wastewater pretreatment device 1 is connected to the mixing tank 2, the mixing tank 2 is connected to the anaerobic tank 3, the anaerobic tank 3 is connected to the anoxic tank 4, the anoxic tank 4 is connected to the aerobic tank 5, the aerobic tank 5 is connected to the sedimentation tank 6, the bottom of the sedimentation tank 6 is connected to the dewatering chamber 8, and the upper port of the dewatering chamber 8 is connected to the mixing tank 2 via a return pipe from the output end of a return pump.

[0033] Of the above equipment:

[0034] Mixing tank 2: Used to adjust the quality of wastewater, such as adjusting the pH value; and to regulate the inflow of water to downstream treatment equipment so that the overall water supply of the system matches the wastewater purification capacity.

[0035] Anaerobic tank 3: Contains a variety of large quantities of anaerobic microorganisms and a small number of facultative anaerobic microorganisms (facultative anaerobic microorganisms exist in anaerobic environments; these facultative anaerobic bacteria can protect strict anaerobic bacteria like methanogens from oxygen damage and inhibition). The reaction process is as follows:

[0036] (1) Under the combined action of a large number of anaerobic microorganisms, high molecular weight organic matter in wastewater is decomposed into smaller molecules by bacterial extracellular enzymes. For example, proteins are hydrolyzed into short peptides and amino acids by protease. That is, complex organic compounds are decomposed and transformed into simple and stable compounds, while releasing energy. Most of the energy is released in the form of methane.

[0037] (2) The small molecules are then transformed into simpler compounds inside the cells of fermenting bacteria (i.e., acidifying bacteria) and secreted outside the cells. The main products of this stage include volatile fatty acids, alcohols, lactic acid, carbon dioxide, hydrogen, etc. (the composition of the products depends on the anaerobic degradation conditions, the type of substrate, and the microbial population involved in acidification).

[0038] (3) Under the action of hydrogen-producing and acetic acid-producing bacteria, the products of the previous stage are further converted into acetic acid, hydrogen, carbonic acid and new cell material.

[0039] (4) Methanogenic bacteria convert acetic acid, acetate, carbon dioxide and hydrogen into methane. There are two physiologically different methanogenic bacteria that complete the process: one group converts hydrogen and carbon dioxide into methane, and the other group decarboxylates acetic acid or acetate to produce methane.

[0040] Anoxic Tank 4: Contains a large number of different populations of anoxic and facultative anaerobic microorganisms. Under anoxic conditions, dissolved oxygen (DO) is absent in Anoxic Tank 4, but oxidants such as nitrate nitrogen (e.g., nitrates) are still present. In the anoxic environment, denitrifying bacteria and other microorganisms mainly reduce nitrate nitrogen to nitrogen gas or nitrite through the denitrification process. This process helps remove nitrogen pollutants such as nitrate nitrogen from wastewater, and some anoxic bacteria can simultaneously degrade organic matter, removing BOD from the wastewater.

[0041] Aerobic tank 5: Contains a large number of aerobic microorganisms and some facultative anaerobic microorganisms. In the presence of free oxygen, these aerobic microorganisms degrade organic matter, rendering it harmless and stable. Furthermore, the microorganisms can utilize organic pollutants in the wastewater as a nutrient source for aerobic metabolism. The reaction process is as follows:

[0042] (1) Adsorption stage: During the process of contacting activated sludge microorganisms, pollutants in wastewater are adsorbed and adhered by flocs formed by microorganisms.

[0043] (2) Oxidation stage: Under aerobic conditions, microorganisms use some of the organic matter that has been adsorbed and ingested as nutrients to synthesize cellular substances, while the other part of the organic matter is decomposed and metabolized, releasing energy.

[0044] Settling tank 6: The treated water is left to stand in settling tank 6 or a flocculant is added to form flocs, which are then separated from the water by gravity sedimentation, thus purifying the water.

[0045] Dewatering chamber 8: The sludge that settles in the sedimentation tank 6 is discharged into the dewatering chamber 8 for compression and dewatering. The clear liquid produced after dewatering is then returned to the mixing tank 2 through the return pipe for circulation and purification.

[0046] Disinfection tank 7: Add disinfectants such as liquid chlorine, ozone, sodium chlorate, chlorine dioxide, and ultraviolet light to the degraded, filtered, and settled water to kill harmful pathogenic microorganisms in the water and further improve water quality.

[0047] In operation, wastewater is injected into treatment chamber 101. After passing through screen 102, significant suspended solids are trapped. The wastewater is then fed into equalization tank 2, where it accumulates and is treated with chemicals to adjust its quality, such as balancing the pH. The adjusted wastewater, at a rate suitable for the system's purification capacity, enters anaerobic tank 3, where complex macromolecules are broken down into smaller, more readily available molecules. The wastewater from anaerobic tank 3 is then fed into anoxic tank 4, where nitrification and denitrification reactions occur to remove nitrogenous pollutants. The wastewater from anoxic tank 4 is then fed into aerobic tank 5, where, in the presence of free oxygen, aerobic microorganisms degrade organic matter, rendering it harmless and stable. Finally, the water from aerobic tank 5 flows into sedimentation tank 6, where flocculants and sludge settle. The settled sludge and other contaminants are fed into dewatering chamber 8 for dewatering. The dewatered sludge forms mud cakes, which can be recycled and reused, such as as a fertilizer raw material or for soil improvement. This maximizes resource utilization and saves on water treatment costs when sold externally. The clear liquid at the top of settling tank 6 is greywater, which can be used for irrigation, car washing, fire fighting, etc. The clear liquid from settling tank 6 is then fed into disinfection tank 7 for sterilization and pest control, further improving the water quality so that it can be used as drinking water.

[0048] In this embodiment, a nanofiltration membrane is provided at the connection between the sedimentation tank 6 and the disinfection tank 7. The residual tiny floating matter is filtered again through the nanofiltration membrane, which can improve water quality and reduce the burden of subsequent disinfection and other re-treatment processes.

[0049] In this embodiment, aeration devices 9 are provided in the mixing tank 2, anaerobic tank 3, anoxic tank 4, and aerobic tank 5. The aeration device 9 includes a coil for aeration and an aeration assembly connected to the coil. The fine bubbles generated by the aeration device 9 agitate the wastewater, preventing suspended solids in the wastewater from settling in other components before the sedimentation process, thus ensuring centralized sedimentation treatment of sludge.

[0050] In this embodiment, the wastewater pretreatment equipment 1 includes a treatment chamber 101. A pipe from the pump output port at the bottom of the rear water storage section of the treatment chamber 101 is connected to the upper input port of the mixing tank 2, allowing wastewater from the treatment chamber 101 to enter the mixing tank 2. A grid 102 is installed inside the treatment chamber 101. The grid 102 is a conventionally arranged mesh, or formed by welding several intersecting steel bars, or by cutting several through holes in a steel plate using laser cutting or other methods. A chain conveyor belt 103 is installed inside the treatment chamber 101 on the side of the grid 102 facing away from the mixing tank 2. Each chain plate of the chain conveyor belt 103 is fastened with fasteners or welded with a scraper 104, which rests against the surface of the grid 102 on the side facing away from the mixing tank 2.

[0051] A settling trough 108 is located inside the processing chamber 101, next to the chain conveyor belt 103. An inclined floating material conveyor belt 105 is installed within the settling trough 108. The upward-curved end of the floating material conveyor belt 105 extends outside the processing chamber 101. A screen chamber 106 is mounted outside the processing chamber 101, supported by a bracket (not shown in the attached diagram). The screen chamber 106 is inclined downwards and outwards from the side opposite to the processing chamber 101. The bottom wall of the screen chamber 106 is a filter screen with a plurality of filter holes evenly distributed on it. A collection chamber 107 is installed at the bottom of the screen chamber 106, parallel to the ground. The bottom of the collection chamber 107 is connected to the mixing tank 2 via pipe six. The bottom of the settling trough 108 is connected to pipe six via pipe seven.

[0052] A baffle plate is installed on the front side of the treatment chamber 101 to prevent wastewater from overflowing.

[0053] The output shafts of the chain conveyor belt 103 and the floating material conveyor belt 105 are connected by chain drive and driven by corresponding motors to ensure their respective operational stability. Baffles are provided on both sides of the floating material conveyor belt 105 to prevent waste from falling. The surface of the floating material conveyor belt 105 is evenly distributed with several protrusions resembling speed bumps to prevent waste from rolling off the surface. The inclination angle of the floating material conveyor belt 105 does not exceed 45° to reduce the probability of waste rolling off.

[0054] In operation, the chain conveyor belt 103 runs continuously. Obvious floating debris trapped in the treatment chamber 101 by the grid 102 is dislodged by the scraper 104 and falls into the settling trough 108, then conveyed to the screening chamber 106 by the floating debris conveyor belt 105. The waste moves down the inclined filter screen at the bottom of the screening chamber 106. During this movement, residual wastewater on the waste flows through the filter screen into the collection chamber 107, and then flows through pipe six into the mixing tank 2 for purification. Wastewater flowing into the settling trough 108 also flows through pipe seven into pipe six and enters the mixing tank 2.

[0055] The sink trough 108 is equipped with a sealing plate to prevent garbage from slipping to the lower end of the floating object conveyor belt 105.

[0056] The lower end of the floating material conveyor belt 105 is provided with an inclined guide plate with a U-shaped cross section, which is used to collect the wastewater dripping from the floating material conveyor belt 105 and then collect the wastewater into the settling tank 108.

[0057] In this embodiment, the mixing tank 2, anaerobic tank 3, anoxic tank 4, aerobic tank 5, sedimentation tank 6, and disinfection tank 7 are all connected to a gas collection device to collect odorous gases generated during water treatment, such as methane, as well as odorous gases from water decay. This prevents odorous gases from overflowing and polluting the environment and affecting the health of workers. The collected odorous gases can be recycled, such as for methane, making full use of resources. Unusable gases are purified by a spray tower before being discharged.

[0058] In a further embodiment of this scheme, the gas introduced into the aeration device 9 in the anaerobic tank 3 is oxygen-free or has a low oxygen content. This is to avoid affecting the comfortable living conditions of the anaerobic bacteria in the anaerobic tank 3, that is, to avoid affecting the water purification efficiency and effect of the anaerobic bacteria in the anaerobic tank 3.

[0059] In a further embodiment of this solution, the grid 102 is inclined, and the scraper 104 is wedge-shaped with its wedge-shaped surface abutting against the surface of the grid 102. Increasing the area of ​​the grid 102 increases the flow rate of wastewater through the grid 102, improves the interception capacity of the grid 102, and increases the amount of wastewater passing through the treatment chamber 101 per unit, thereby improving the treatment efficiency of the pretreatment equipment 1.

[0060] In a further embodiment of this solution, the treatment chamber 101 is divided into a water storage chamber 1012 and a water injection chamber 1011 by a grid 102, with the bottom wall of the water storage chamber 1012 located below the bottom wall of the water injection chamber 1011. The water storage chamber 1012 is connected to the mixing tank 2, and a chain conveyor belt 103 is located inside the water injection chamber 1011. Wastewater is injected into the water injection chamber 1011, and after being intercepted by the grid 102, it flows into the water storage chamber 1012. The treatment chamber 101 is divided into two parts, with the water storage chamber 1012 accumulating the initially intercepted wastewater, relieving the storage pressure on the mixing tank 2, and also giving the water quality in the mixing tank 2 time for adjustment and retention. This allows for continuous water injection, eliminating the need for frequent shutdowns of the pretreatment equipment 1 and improving the efficiency of water treatment.

[0061] In a further embodiment of this scheme, the bottom of the water storage tank 1012 is connected to the upper end of the mixing tank 2, the lower end of the mixing tank 2 is connected to the upper end of the anaerobic tank 3, the lower end of the anaerobic tank 3 is connected to the lower end of the anoxic tank 4, the upper end of the anoxic tank 4 is connected to the lower end of the aerobic tank 5, and the upper end of the aerobic tank 5 is connected to the upper end of the sedimentation tank 6.

[0062] Principle details of this embodiment:

[0063] The output end of the wastewater pretreatment equipment 1 is connected to the upper input port of the mixing tank 2, so that wastewater is input into the mixing tank 2.

[0064] The pipe at the output end of the pump on the bottom of the mixing tank 2 extends into the anaerobic tank 3 and extends to the bottom of the anaerobic tank 3, so that wastewater is input from the mixing tank 2 into the bottom of the anaerobic tank 3.

[0065] The upper outlet of the anaerobic tank 3 is connected to the input of the pump 2 at the bottom of the anoxic tank 4 via pipe 2, so that wastewater is input from the upper end of the anaerobic tank 3 to the bottom end of the anoxic tank 4.

[0066] The upper outlet of the anoxic tank 4 is connected to the input of the pump 3 at the bottom of the aerobic tank 5 via a pipe 3, so that wastewater is input from the upper end of the anoxic tank 4 to the bottom end of the aerobic tank 5.

[0067] The upper port of the aerobic tank 5 is connected to the upper port of the sedimentation tank 6, so that wastewater flows from the upper end of the aerobic tank 5 into the upper end of the sedimentation tank 6.

[0068] The bottom of the sedimentation tank 6 is tapered, and a pump four is connected to the bottom of the tapered end. The output end of the pump four is connected to the dewatering chamber 8 via a pipe four, so that the sludge settled in the sedimentation tank 6 is input into the dewatering chamber 8. The upper port of the sedimentation tank 6 is connected to the upper inlet of the disinfection tank 7, so that the clear liquid in the sedimentation tank 6 extends into the disinfection tank 7.

[0069] Through the above-mentioned connection method, the travel distance of wastewater within the entire integrated water treatment equipment is maximized, especially in anaerobic tank 3, anoxic tank 4, and aerobic tank 5. This increases the contact time between wastewater and microbial flora, improves the degradation effect on complex macromolecules in the wastewater, and thus enhances the purification effect on water quality.

[0070] In a further embodiment of this solution, a baffle is provided in the sedimentation tank 6 at the location where it connects with the aerobic tank 5. The baffle acts as a buffer and barrier, reducing the amplitude of the oscillation caused by the inflow of water from the aerobic tank 5 in the area where the disinfection tank 7 connects with the sedimentation tank 6, and reducing the possibility of the sediment floating again due to liquid level fluctuations.

[0071] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and application concept of this application, should be included within the scope of protection of this application.

[0072] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0073] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An integrated domestic sewage treatment equipment, characterized in that, It includes a wastewater pretreatment device (1), a mixing tank (2), a biological contact oxidation tank, a sedimentation tank (6), and a disinfection tank (7) connected in sequence; the bottom of the sedimentation tank (6) is connected to a dewatering chamber (8), and the upper port of the dewatering chamber (8) is connected to the mixing tank (2); The biological contact oxidation tank includes an anaerobic tank (3), an anoxic tank (4), and an aerobic tank (5) in sequence. Each of the anaerobic tank (3), anoxic tank (4), and aerobic tank (5) is equipped with an aeration device (9). The wastewater pretreatment equipment (1) includes a treatment chamber (101) connected to the mixing tank (2). The treatment chamber (101) is equipped with a screen (102) and a chain conveyor belt (103). Each chain plate of the chain conveyor belt (103) is equipped with a scraper (104), which abuts against the surface of the screen (102). An inclined floating material conveyor belt (105) is provided on the side of the chain conveyor belt (103) in the treatment chamber (101). A sinking trough (108) is provided on the side of the screen (102) in the treatment chamber (101). The lower end of the floating material conveyor belt (105) is located in the sinking trough (108), and an inclined screen chamber (106) is installed on the upper end. The bottom wall of the screen chamber (106) is a filter screen. A collection chamber (107) is installed parallel to the bottom of the screen chamber (106), and the bottom of the collection chamber (107) is connected to the mixing tank (2).

2. The integrated domestic sewage treatment equipment according to claim 1, characterized in that, The gas introduced into the aeration device (9) in the anaerobic tank (3) is oxygen-free.

3. The integrated domestic sewage treatment equipment according to claim 1, characterized in that, The grid (102) is inclined, and the scraper (104) is wedge-shaped with its wedge-shaped surface abutting against the surface of the grid (102).

4. The integrated domestic sewage treatment equipment according to claim 1, characterized in that, The processing chamber (101) is divided into a water storage chamber (1012) and a water injection chamber (1011) by a grid (102). The water storage chamber (1012) is connected to the mixing tank (2), and the chain plate conveyor belt (103) is located inside the water injection chamber (1011).

5. The integrated domestic sewage treatment equipment according to claim 4, characterized in that, The bottom of the water storage tank (1012) is connected to the top of the mixing tank (2), the bottom of the mixing tank (2) is connected to the top of the anaerobic tank (3), the bottom of the anaerobic tank (3) is connected to the bottom of the anoxic tank (4), the top of the anoxic tank (4) is connected to the bottom of the aerobic tank (5), and the top of the aerobic tank (5) is connected to the top of the sedimentation tank (6).

6. The integrated domestic sewage treatment equipment according to claim 1, characterized in that, The sedimentation tank (6) is equipped with a partition at the part that connects with the aerobic tank (5).

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