Domestic sewage treatment device and treatment method

Abstract

The present invention provides a domestic sewage treatment device and treatment method, which includes a sedimentation tank, a liquid extraction pipeline, a liquid separation pipe assembly, a drive assembly, a reprocessing assembly, a liquid discharge pipeline, and a PLC control system; the liquid extraction pipeline is connected to the sedimentation tank, and the liquid separation pipe assembly is connected to the liquid extraction pipeline; after the domestic sewage is precipitated in the sedimentation tank, a neutralizer is added for neutralization, and then pressurized by a booster water pump in the liquid extraction pipeline and enters the liquid separation pipe assembly. The pressurized domestic sewage is evenly sprayed into the reprocessing assembly, and larger particles of solids are retained in the filter basket of the reprocessing assembly. Domestic sewage containing smaller solids is further processed by the reprocessing assembly, and the treated liquid flows to the liquid discharge pipeline and then into a designated pipeline. The device integrates multiple advanced processing units such as sedimentation, filtration, and crushing, and realizes automated control while improving treatment efficiency, significantly reducing labor costs. The device has a compact structure and occupies a small area.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to a domestic sewage treatment device and a treatment method. Background Art

[0002] Domestic sewage refers to sewage discharged from towns, rural residential areas and other living places, which contains human waste, domestic waste, washing wastewater, etc. It mainly comes from residents' daily activities, including wastewater discharged from drinking, washing, cleaning and other processes. If it is not treated and discharged directly, it will cause pollution to the ecological environment. Therefore, domestic sewage must be treated. It can be subjected to a series of physical, chemical, biological and other treatment processes to remove or transform the harmful substances in it so that it meets the emission standards or reusable water quality requirements.

[0003] The treatment efficiency of domestic sewage treatment devices in existing technologies is generally low, especially for some difficult-to-degrade organic compounds, which makes it difficult for the effluent water quality to meet increasingly stringent environmental protection requirements. Such devices occupy a large area, resulting in a waste of land resources; at the same time, the operating costs of traditional domestic sewage treatment devices are high, and many devices have a low degree of automation, requiring a large amount of manual participation in operation and maintenance. These factors make the overall operating costs high, which is not conducive to promotion and application.

[0004] Authorization announcement No. CN115304162B discloses a rural domestic sewage treatment device and sewage treatment method, which includes a sewage collection system, a discharge pipe assembly, a vertical flow artificial wetland pool, a support base assembly, an anaerobic treatment system, an air intake and exhaust device, an air intake pipe, an aeration pipe assembly and an aerobic treatment system. The discharge pipe assembly is located at the upper part of the sewage collection system, the vertical flow artificial wetland pool is located at the bottom of the discharge pipe assembly, the anaerobic treatment system is connected to the aerobic treatment system through a second drain pipe, and an air intake and exhaust device is provided between the anaerobic treatment system and the aerobic treatment system. Although the invention can solve the pollution problem of domestic sewage, the process route of the invention is relatively complicated, and the selection and construction of the vertical flow artificial wetland pool are not suitable for all places. That is, the invention still has the problem of occupying a large area, resulting in waste of land resources. At the same time, due to the establishment of the vertical artificial wetland pool, the anaerobic system and the aerobic system, the overall cost is very high. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a domestic sewage treatment device and treatment method, which effectively solves the problem that the treatment efficiency of domestic sewage treatment devices in the existing technology is generally low, especially for some difficult-to-degrade organic compounds, which makes the effluent water quality difficult to meet increasingly stringent environmental protection requirements. Such devices occupy a large area, resulting in a waste of land resources; at the same time, the operating cost of traditional domestic sewage treatment devices is high, and many devices have a low degree of automation, requiring a large amount of manual participation in operation and maintenance. These factors make the overall operating cost high, which is not conducive to promotion and application.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a domestic sewage treatment device, comprising a first sedimentation tank, a second sedimentation tank, a liquid extraction pipeline, a liquid separation pipe assembly, a drive assembly, a reprocessing assembly, a liquid discharge pipeline and a PLC control system; the liquid extraction pipeline is respectively connected to the first sedimentation tank and the second sedimentation tank, and the liquid separation pipe assembly is connected to the liquid extraction pipeline; after the domestic sewage is precipitated in the sedimentation tank, a neutralizer is added for neutralization, and then the domestic sewage is pressurized by the booster water pump of the liquid extraction pipeline and enters the liquid separation pipe assembly. The pressurized domestic sewage is evenly sprayed into the reprocessing assembly, and larger particles of solids are retained in the filter basket of the reprocessing assembly. The domestic sewage containing smaller solids is further processed by the reprocessing assembly, and the treated liquid flows to the liquid discharge pipeline and then flows into the designated pipeline.

[0007] As a further improvement of the technical solution of the present invention, wherein: the first sedimentation tank is provided with a first solenoid valve at the feed end, and a second solenoid valve is provided at the discharge end; a first liquid level sensor is provided on one side of the first sedimentation tank; a third solenoid valve is provided at the feed end of the second sedimentation tank, and a fourth solenoid valve is provided at the discharge end; a second liquid level sensor is provided on one side of the second sedimentation tank; a first stop valve is also provided on the liquid extraction pipeline, and a second stop valve is provided on the liquid discharge pipeline.

[0008] As a further improvement of the technical solution of the present invention, the liquid distributing pipe assembly is a three-way structure, and a plurality of spray holes are evenly opened on the bottom of the liquid distributing pipe assembly.

[0009] As a further improvement of the technical solution of the present invention, the drive assembly is powered by a drive motor, and the shaft end of the output shaft of the drive assembly is connected to a coupling.

[0010] As a further improvement of the technical solution of the present invention, the reprocessing assembly also includes a reprocessing shell assembly and a rotating shaft assembly, one end of the rotating shaft assembly extends into the reprocessing shell assembly, and the other end of the rotating shaft assembly is connected to the coupling, and the filter basket is located on the top of the reprocessing shell assembly and is clamped thereto.

[0011] As a further improvement of the technical solution of the present invention, the reprocessing shell assembly includes a lower base, an upper base, a first gasket, a second gasket, a sealing plate, a first end cover assembly, a second end cover assembly, an arc-shaped limit block, a rectangular limit block and a second bearing seat assembly. The lower base, the first gasket and the upper base are connected into a whole by bolts, and the second end cover assembly is connected to the first bearing seat assembly on the side close to the drive assembly.

[0012] As a further improvement of the technical solution of the present invention, the lower base is provided with a lower base water outlet pipe, an impurity holding channel and an arc-shaped limit seat, the bottom of the impurity holding channel is provided with a flange, the sealing plate, the second gasket and the flange of the impurity holding channel are connected by bolts, the arc-shaped limit seat is located inside the lower base and fixedly connected thereto, a limiting groove is provided inside the arc-shaped limit seat, the arc-shaped limit block is engaged in the limiting groove of the arc-shaped limit seat, a rectangular limit seat and a rectangular opening are provided on the upper base, the rectangular limit seat is located inside the upper base and fixedly connected thereto, a limiting groove is provided inside the rectangular limit seat, the rectangular limit block is engaged in the limiting groove of the rectangular limit seat, and the second bearing seat assembly is respectively connected to the arc-shaped limit block and the rectangular limit block.

[0013] As a further improvement of the technical solution of the present invention, the rotating shaft assembly includes a rotating shaft, a flat key, a re-filtration assembly, a circular limit block, a gasket and a tightening block, the rotating shaft passes through the re-filtration assembly, the circular limit block, the gasket, the tightening block and the scraper, and the scraper is fixedly connected to the outer periphery of the re-filtration assembly and the circular limit block.

[0014] As a further improvement of the technical solution of the present invention, a rotating shaft drain port is provided at one end of the rotating shaft away from the coupling, a first groove is provided at the middle end of the rotating shaft, the flat key is engaged in the first groove, a rotating shaft liquid inlet is provided at the middle end of the rotating shaft, the rotating shaft liquid inlet is connected to the rotating shaft drain port, a rotating shaft external thread is provided at the end of the middle end of the rotating shaft, a second groove is provided on the re-filtration component, a second filter hole is provided on the surface and side of the re-filtration component, a confluence hole is provided on the annular inner surface of the re-filtration component, and the specification and position of the confluence hole are consistent with those of the rotating shaft liquid inlet.

[0015] The present invention also provides a method for treating domestic sewage using the domestic sewage treatment device, the treatment method comprising the following steps:

[0016] S11, when the domestic sewage in the first sedimentation tank reaches a set high level, the domestic sewage is flowed into the second sedimentation tank;

[0017] S12, adding a neutralizing agent to the first sedimentation tank and performing precipitation;

[0018] S13, pumping the domestic sewage in the first sedimentation tank into the liquid separation pipe assembly;

[0019] S13, pumping the domestic sewage from the first sedimentation tank into the liquid separation pipe assembly;

[0020] S14, at this time, the pressurized domestic sewage is evenly sprayed into the reprocessing assembly through the spray hole, larger solid particles are retained in the filter basket, and domestic sewage containing smaller solids enters cavity A of the reprocessing shell assembly;

[0021] S15, starting the drive motor to drive the rotating shaft assembly to rotate, and then the solid impurities in the domestic sewage in the A chamber of the treatment shell assembly are further crushed. At the same time, the neutralized liquid enters the drainage pipeline after further treatment and then flows into the designated pipeline;

[0022] S15, starting the drive motor to drive the rotating shaft assembly to rotate, and then the solid impurities in the domestic sewage in the A chamber of the treatment shell assembly are further crushed. At the same time, the neutralized liquid enters the drainage pipeline after further treatment and then flows into the designated pipeline;

[0023] S16, when the domestic sewage in the first sedimentation tank reaches the set low level, stop pumping;

[0024] S17, stop the operation of the drive motor;

[0025] S18, when the domestic sewage in the second sedimentation tank reaches a set high level, the domestic sewage is flowed into the first sedimentation tank;

[0026] S19, adding a neutralizing agent in the second sedimentation tank and performing precipitation;

[0027] S20, pumping the domestic sewage in the second sedimentation tank into the liquid separation pipe assembly;

[0028] S21, repeating steps S14 and S15;

[0029] S22, when the domestic sewage in the second sedimentation tank reaches the set low level, stop pumping;

[0030] S23, stops the operation of the driving motor.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The present invention provides a domestic sewage treatment device that integrates multiple advanced treatment units such as sedimentation, filtration, and crushing. While improving treatment efficiency, it realizes automated control and significantly reduces labor costs.

[0033] (2) The present invention provides a domestic sewage treatment device that uses a multi-stage sedimentation process to achieve continuous treatment and improve overall treatment capacity. Adding a neutralizing agent to the sedimentation tank can effectively adjust the pH value and promote the precipitation and removal of pollutants.

[0034] (3) The present invention provides a domestic sewage treatment device, which is equipped with a rotating shaft assembly that can crush and stir solid particles in sewage to enhance the solid-liquid separation effect.

[0035] (4) The present invention provides a domestic sewage treatment device. In terms of the transportation system, the device adopts a liquid extraction pipeline and a liquid distribution pipe assembly to enable the sewage to flow smoothly between different treatment units, avoiding the cumbersome problems of traditional pipelines. In terms of the effluent water quality, it is also equipped with re-processing components such as filtration and secondary filtration to ensure that the effluent indicators are stable and meet the standards.

[0036] (5) The present invention provides a domestic sewage treatment device with a compact structure and a small footprint.

[0037] (6) The present invention provides a domestic sewage treatment device that integrates multiple advanced technologies and realizes an efficient, energy-saving and intelligent operation mode. By improving treatment efficiency and reducing operating costs, the device provides strong support for the widespread promotion of domestic sewage treatment technology and is of great significance in improving the living environment of urban and rural residents and protecting regional water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0039] Figure 2 yes Figure 1 A-direction view;

[0040] Figure 3 It is a schematic diagram of the filter basket structure of the present invention;

[0041] Figure 4 It is a schematic diagram of the internal structure of the reprocessing component of the present invention;

[0042] Figure 5 It is a structural schematic diagram of the lower base of the present invention;

[0043] Figure 6 It is a structural schematic diagram of the upper base of the present invention;

[0044] Figure 7 is a schematic structural diagram of a rotating shaft assembly of the present invention;

[0045] Figure 8 It is a schematic structural diagram of the rotating shaft of the present invention;

[0046] Figure 9 It is a schematic structural diagram of the re-filtration component of the present invention.

[0047] In the figure: 100, first sedimentation tank; 101, first solenoid valve; 102, first liquid level sensor; 103, second solenoid valve; 200, second sedimentation tank; 201, third solenoid valve; 202, second liquid level sensor; 203, fourth solenoid valve; 300, liquid extraction pipeline; 301, booster pump; 302, first stop valve; 400, liquid distribution pipe assembly; 401, spray hole; 500, drive assembly; 501, drive motor; 502, coupling; 600, filter basket; 601, first filter hole; 700, reprocessing shell assembly; 701, first gasket; 710, lower base; 711, lower base water outlet pipe; 712, impurity holding channel; 713, arc limit seat; 720, upper base; 721 , rectangular limit seat; 722, rectangular opening; 730, second gasket; 740, sealing plate assembly; 750, first end cover assembly; 760, second end cover assembly; 761, first bearing seat assembly; 770, arc limit block; 780, rectangular limit block; 790, second bearing seat assembly; 800, rotating shaft assembly; 810, rotating shaft; 811, first groove; 812, rotating shaft liquid inlet; 813, rotating shaft external thread; 814, rotating shaft liquid discharge port; 820, flat key; 830, re-filtration assembly; 831, second groove; 832, second filter hole; 833, confluence hole; 840, circular limit block; 850, gasket; 860, tightening block; 900, discharge pipeline; 901, second stop valve. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] It should be pointed out that the terms "upper", "lower", "left", "right", "top", "bottom", "inside", "outside" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0050] It should be understood that, in the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense.

[0051] Example 1

[0052] See attached Figures 1 to 9 The present embodiment provides a domestic sewage treatment device, comprising a first sedimentation tank 100, a second sedimentation tank 200, a liquid extraction pipeline 300, a liquid distribution pipe assembly 400, a drive assembly 500, a reprocessing assembly, a liquid discharge pipeline 900, and a PLC control system. To better illustrate the structure of the rotating shaft assembly 800, Figure 7 Only a portion of the re-filter assembly 830 and the tightening block 860 are shown.

[0053] The first sedimentation tank 100 and the second sedimentation tank 200 are connected in parallel. The structures of the first sedimentation tank 100 and the second sedimentation tank 200 can be exactly the same, one for use and one for backup. Their main function is to concentrate the sedimentation of domestic sewage. When one of the sedimentation tanks is full of domestic sewage, samples can be taken through its sampling port for pH testing. According to the pH test results, a suitable neutralizer is added to the interior so that the pH value after mixing is close to 7.

[0054] The first sedimentation tank 100 is equipped with a first solenoid valve 101 at the feed end and a second solenoid valve 103 at the discharge end. A first liquid level sensor 102 is installed on one side of the first sedimentation tank 100. The second sedimentation tank 200 is equipped with a third solenoid valve 201 at the feed end and a fourth solenoid valve 203 at the discharge end. A second liquid level sensor 202 is installed on one side of the second sedimentation tank 200. A first stop valve 302 is also installed on the liquid extraction pipeline 300. By controlling the high and low positions of the liquid level sensors, the signal is fed back to the PLC control system, thereby controlling the opening and closing states of each solenoid valve. The bottoms of the first sedimentation tank 100 and the second sedimentation tank 200 are usually equipped with sewage pipes to facilitate the cleaning of precipitated impurities at the bottoms of the first sedimentation tank 100 and the second sedimentation tank 200.

[0055] The liquid extraction pipeline 300 is connected to the first sedimentation tank 100 and the second sedimentation tank 200 respectively, and the liquid separation pipe assembly 400 is connected to the liquid extraction pipeline 300; the liquid separation pipe assembly 400 is a three-way structure, in which the vertical end of the liquid separation pipe assembly 400 is connected to the liquid extraction pipeline 300, and a number of spray holes 401 are evenly opened at the bottom of the liquid separation pipe assembly 400.

[0056] After settling in the sedimentation tank, the domestic sewage is neutralized by adding a neutralizer. It is then pressurized by the booster pump 301 of the liquid extraction line 300 and enters the liquid distribution pipe assembly 400. Since the domestic sewage in the liquid distribution pipe assembly 400 is under pressure, the pressurized domestic sewage is evenly sprayed into the reprocessing assembly. Larger particles of solids are retained in the filter basket 600 of the reprocessing assembly. Domestic sewage containing smaller solids is further processed by the reprocessing assembly. The treated liquid flows to the drainage line 900 and then into the designated pipeline. In order to better ensure the uniformity of the spraying of the liquid distribution pipe assembly 400, a support (not shown in the figure) is usually added to the bottom of the liquid distribution pipe assembly 400. However, the setting of the support must not affect the removal and placement of the filter basket 600.

[0057] The driving assembly 500 is powered by a driving motor 501 , and a coupling 502 is connected to the shaft end of the output shaft of the driving assembly 500 .

[0058] The reprocessing assembly also includes a reprocessing housing assembly 700 and a rotating shaft assembly 800. One end of the rotating shaft assembly 800 extends into the reprocessing housing assembly 700, and the other end of the rotating shaft assembly 800 is connected to the coupling 502. A folded edge is provided around the top of the filter basket 600. The filter basket 600 is located on the top of the reprocessing housing assembly 700 and is snap-connected thereto. A handle (not shown) is usually provided on the folded edge of the filter basket 600. The handle is used to separate the filter basket 600 from the reprocessing housing assembly 700, making it convenient to dump large particles of solid in the filter basket 600.

[0059] The reprocessing shell assembly 700 includes a lower base 710, an upper base 720, a first gasket 701, a second gasket 730, a sealing plate 740, a first end cover assembly 750, a second end cover assembly 760, an arc-shaped limit block 770, a rectangular limit block 780 and a second bearing seat assembly 790. The main body of the lower base 710 is semi-cylindrical, and the main body of the upper base 720 is a rectangular parallelepiped. The lower base 710 and the upper base 720 are both provided with folded edges, and the folded edges are provided with mounting through holes. The lower base 710, the first gasket 701 and the upper base 720 are connected into a whole by bolts. One side of the whole The reprocessing housing assembly 700 is connected to the first end cover assembly 750 via bolts, and the other side of the assembly is connected to the second end cover assembly 760 via bolts. The side of the second end cover assembly 760 near the drive assembly 500 is connected to the first bearing seat assembly 761. The reprocessing housing assembly 700 is divided into two chambers, A and B. The lower base 710, upper base 720, second end cover assembly 760, arc-shaped stopper 770, and rectangular stopper 780 form chamber A, while the lower base 710, upper base 720, first end cover assembly 750, arc-shaped stopper 770, and rectangular stopper 780 form chamber B. Multiple supports (not shown) are typically provided on the lower base 710 to secure and support the reprocessing assembly.

[0060] The lower base 710 is provided with a lower base water outlet pipe 711, an impurity holding channel 712 and an arc-shaped limit seat 713. The bottom of the impurity holding channel 712 is provided with a flange. The sealing plate 740, the second gasket 730 and the flange of the impurity holding channel 712 are connected by bolts. The arc-shaped limit seat 713 is located inside the lower base 710 and is fixedly connected thereto. A limiting groove is provided inside the arc-shaped limit seat 713. The arc-shaped limit block 770 is engaged in the limiting groove of the arc-shaped limit seat 713. The upper base 720 is provided with a rectangular limit seat 721 and a rectangular opening 722. The rectangular limit seat 721 is located inside the upper base 720 and is fixedly connected thereto. A limiting groove is provided inside the rectangular limit seat 721. The rectangular limit block 780 is engaged in the limiting groove of the rectangular limit seat 721. The second bearing seat assembly 790 is respectively connected to the arc-shaped limit block 770 and the rectangular limit block 780.

[0061] In order to conveniently observe the condition of the filter basket 600, an observation window (not shown in the figure) is set on a periphery corresponding to the rectangular opening 722. Similarly, an observation window (not shown in the figure) can also be opened on one surface of the impurity holding channel 712. When the rotating shaft assembly 800 is not running, if a large amount of solid impurities is observed in the impurity holding channel 712 through the impurity holding channel 712, the sealing plate 740, the second gasket 730 and the lower base 710 can be separated.

[0062] The rotating shaft assembly 800 includes a rotating shaft 810, a flat key 820, a re-filtration assembly 830, a circular limit block 840, a gasket 850 and a tightening block 860. The rotating shaft 810 passes through the re-filtration assembly 830, the circular limit block 840, the gasket 850, the tightening block 860 and the scraper (not shown in the figure). A circular limit block 840 is arranged between any adjacent re-filtration assemblies 830. The re-filtration assemblies 830 at the head and tail ends are positioned by the gasket 850 and the tightening block 860. The scrapers are fixedly connected to the outer periphery of the re-filtration assembly 830 and the circular limit block 840, and the scrapers are irregularly arranged. When the rotating shaft assembly 800 rotates, the solids in cavity A of the reprocessing shell assembly 700 collide with the scraper and are crushed under the action of centrifugal force.

[0063] The rotating shaft 810 is thick in the middle and thin at both ends. A rotating shaft drain port 814 is provided at the end of the rotating shaft 810 away from the coupling 502. A first groove 811 is provided at the middle end of the rotating shaft 810. The flat key 820 is engaged in the first groove 811. A rotating shaft liquid inlet 812 is provided at the middle end of the rotating shaft 810. The rotating shaft liquid inlet 812 is connected to the rotating shaft drain port 814. A rotating shaft external thread 813 is provided at the end of the middle end of the rotating shaft 810. The main structure of the re-filtration component 830 is an annular structure. A second groove 831 is provided on the re-filtration component 830. A second filter hole 832 is provided on the surface and side of the re-filtration component 830. A confluence hole 833 is provided on the annular inner surface of the re-filtration component 830. The specifications and position of the confluence hole 833 are consistent with the rotating shaft liquid inlet 812.

[0064] When sludge and other impurities are adsorbed on the surfaces of the components in the rotating shaft assembly 800, the filter basket 600 is separated from the reprocessing shell assembly 700 while the pumping is stopped. At the same time, the sealing plate 740, the second gasket 730 and the lower base 710 are separated. The drive motor 501 is started to drive the rotating shaft assembly 800 to rotate. High-pressure water is sprayed from the rectangular opening 722 by a high-pressure water gun. Under the condition that the rotating shaft assembly 800 rotates and generates centrifugal force, the sludge and other impurities adsorbed on the surfaces of the components in the rotating shaft assembly 800 can be cleaned.

[0065] A second stop valve 901 is provided on the drainage pipeline 900. In order to improve the water quality of the outlet water, a filtering device can be added to the drainage pipeline 900 according to the actual situation on site, for example, a Y-type filter can be added to the drainage pipeline 900.

[0066] The present invention also provides a method for treating domestic sewage using the domestic sewage treatment device, the treatment method comprising the following steps:

[0067] S11, when the domestic sewage in the first sedimentation tank 100 reaches the high level set by the first liquid level sensor 102, the first liquid level sensor 102 feeds back a signal to the PLC control system, which closes the first solenoid valve 101 and opens the third solenoid valve 201. At this time, the second solenoid valve 103 and the fourth solenoid valve 203 are in the closed state, and the domestic sewage flows into the second sedimentation tank 200;

[0068] S12, adding an appropriate amount of neutralizing agent into the first sedimentation tank 100 and performing precipitation;

[0069] S13, after a predetermined period of rest, the PLC control system opens the second solenoid valve 103 and starts the booster pump 301, which pumps the domestic sewage in the first sedimentation tank 100 into the liquid distribution pipe assembly 400 through the liquid extraction pipeline 300;

[0070] S14, at this time, the pressurized domestic sewage is evenly sprayed into the reprocessing assembly through the spray hole 401, and the larger solid particles are retained in the filter basket 600, while the domestic sewage containing smaller solid particles enters the A cavity of the reprocessing housing assembly 700;

[0071] S15: Start the drive motor 501, driving the rotating shaft assembly 800 to rotate. The solid impurities in the domestic sewage in chamber A of the reprocessing housing assembly 700 are further crushed. At the same time, the neutralized liquid enters the interior of the re-filtration assembly 830 through the second filter hole 832, enters the rotating shaft liquid inlet 812 through the confluence hole 833, flows into chamber B of the reprocessing housing assembly 700 through the rotating shaft liquid outlet 814, flows into the drainage pipeline 900 through the lower base outlet pipe 711, and then flows into the designated pipeline.

[0072] S16, when the domestic sewage in the first sedimentation tank 100 reaches the low level set by the first liquid level sensor 102, the first liquid level sensor 102 feeds back a signal to the PLC control system, which then closes the second solenoid valve 103 and the booster pump 301;

[0073] S17, after a preset time, stop the operation of the driving motor 501;

[0074] S18, when the domestic sewage in the second sedimentation tank 200 reaches the high level set by the second liquid level sensor 202, the second liquid level sensor 202 feeds back a signal to the PLC control system, which closes the third solenoid valve 201 and opens the first solenoid valve 101. At this time, the second solenoid valve 103 and the fourth solenoid valve 203 are in the closed state, and the domestic sewage flows into the first sedimentation tank 100;

[0075] S19, adding an appropriate amount of neutralizing agent into the second sedimentation tank 200 and performing precipitation;

[0076] S20, after a predetermined period of rest, the PLC control system opens the fourth solenoid valve 203 and starts the booster pump 301, which pumps the domestic sewage in the second sedimentation tank 200 into the liquid distribution pipe assembly 400 through the liquid extraction pipeline 300;

[0077] S21, repeat the above steps S14 and S15;

[0078] S22, when the domestic sewage in the second sedimentation tank 200 reaches the low level set by the second liquid level sensor 202, the second liquid level sensor 202 feeds back a signal to the PLC control system, which then closes the fourth solenoid valve 203 and the booster pump 301;

[0079] S23, after a preset time has passed, the driving motor 501 is stopped.

[0080] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A domestic sewage treatment device, comprising a first sedimentation tank (100) and a second sedimentation tank (200), characterized in that: It also includes a liquid extraction pipeline (300), a liquid dispensing pipe assembly (400), a driving assembly (500), a reprocessing assembly, a liquid discharge pipeline (900) and a PLC control system; The liquid extraction pipeline (300) is connected to the first sedimentation tank (100) and the second sedimentation tank (200) respectively, and the liquid distribution pipe assembly (400) is connected to the liquid extraction pipeline (300); After settling in the sedimentation tank, the domestic sewage is neutralized by adding a neutralizing agent, and then pressurized by the booster pump (301) of the liquid extraction pipeline (300) and enters the liquid distribution pipe assembly (400). The pressurized domestic sewage is evenly sprayed into the reprocessing assembly, and larger particles of solids are retained in the filter basket (600) of the reprocessing assembly. The domestic sewage containing smaller solids is further processed by the reprocessing assembly, and the treated liquid flows to the discharge pipeline (900) and then flows into the designated pipeline. The driving assembly (500) is powered by a driving motor (501), and the shaft end of the output shaft of the driving assembly (500) is connected to a coupling (502). The reprocessing assembly further comprises a reprocessing housing assembly (700) and a rotating shaft assembly (800). One end of the rotating shaft assembly (800) extends into the reprocessing housing assembly (700), and the other end of the rotating shaft assembly (800) is connected to the coupling (502). The filter basket (600) is located on the top of the reprocessing housing assembly (700) and is engaged therewith. The rotating shaft assembly (800) comprises a rotating shaft (810), a flat key (820), a re-filtering assembly (830), a circular stopper (840), a gasket (850) and a tightening block (860); the rotating shaft (810) passes through the re-filtering assembly (830), the circular stopper (840), the gasket (850), the tightening block (860) and the scraper; and the outer peripheries of the re-filtering assembly (830) and the circular stopper (840) are fixedly connected with the scraper; A rotary shaft drain port (814) is provided at one end of the rotary shaft (810) away from the coupling (502), a first groove (811) is provided at the middle end of the rotary shaft (810), and the flat key (820) is engaged in the first groove (811), a rotary shaft liquid inlet (812) is provided at the middle end of the rotary shaft (810), and the rotary shaft liquid inlet (812) is connected to the rotary shaft drain port (814), and a rotary shaft external thread (813) is provided at the end of the middle end of the rotary shaft (810), a second groove (831) is provided on the re-filter component (830), and a second filter hole (832) is provided on the surface and side of the re-filter component (830), and a confluence hole (833) is provided on the annular inner surface of the re-filter component (830), and the specification and position of the confluence hole (833) are consistent with those of the rotary shaft liquid inlet (812).

2. The domestic sewage treatment device according to claim 1, characterized in that: The first sedimentation tank (100) is provided with a first solenoid valve (101) at the feed end, and a second solenoid valve (103) at the discharge end; a first liquid level sensor (102) is provided on one side of the first sedimentation tank (100); a third solenoid valve (201) is provided at the feed end of the second sedimentation tank (200), and a fourth solenoid valve (203) is provided at the discharge end; a second liquid level sensor (202) is provided on one side of the second sedimentation tank (200); a first stop valve (302) is further provided on the liquid extraction pipeline (300), and a second stop valve (901) is provided on the liquid discharge pipeline (900).

3. The domestic sewage treatment device according to claim 2, characterized in that: The liquid dispensing pipe assembly (400) is a three-way structure, and a plurality of spray holes (401) are evenly arranged on the bottom of the liquid dispensing pipe assembly (400).

4. The domestic sewage treatment device according to claim 3, characterized in that: The reprocessing housing assembly (700) includes a lower base (710), an upper base (720), a first gasket (701), a second gasket (730), a sealing plate (740), a first end cover assembly (750), a second end cover assembly (760), an arc-shaped limit block (770), a rectangular limit block (780) and a second bearing seat assembly (790). The lower base (710), the first gasket (701) and the upper base (720) are connected into a whole by bolts, and the second end cover assembly (760) is connected to the first bearing seat assembly (761) on the side close to the driving assembly (500).

5. The domestic sewage treatment device according to claim 4, characterized in that: The lower base (710) is provided with a lower base water outlet pipe (711), an impurity holding channel (712) and an arc-shaped limit seat (713). The bottom of the impurity holding channel (712) is provided with a flange. The sealing plate (740), the second gasket (730) and the flange of the impurity holding channel (712) are connected by bolts. The arc-shaped limit seat (713) is located inside the lower base (710) and is fixedly connected thereto. A limiting groove is provided inside the arc-shaped limit seat (713). The arc-shaped limit block (770) is engaged with the lower base (710). A rectangular limiting seat (721) and a rectangular opening (722) are provided on the upper base (720) in the limiting groove of the arc-shaped limiting seat (713); the rectangular limiting seat (721) is located inside the upper base (720) and is fixedly connected thereto; a limiting groove is provided inside the rectangular limiting seat (721); the rectangular limiting block (780) is engaged in the limiting groove of the rectangular limiting seat (721); and the second bearing seat assembly (790) is respectively connected to the arc-shaped limiting block (770) and the rectangular limiting block (780).

6. The method for treating domestic sewage according to claim 5, characterized in that: The treatment method includes the following steps: S11, when the domestic sewage in the first sedimentation tank (100) reaches a set high level, the domestic sewage is flowed into the second sedimentation tank (200); S12, adding a neutralizing agent to the first sedimentation tank (100) and performing precipitation; S13, extracting the domestic sewage in the first sedimentation tank (100) into the liquid separation pipe assembly (400); S14, at this time, the pressurized domestic sewage is evenly sprayed into the reprocessing assembly through the spray hole (401), larger particles of solids are retained in the filter basket (600), and domestic sewage containing smaller solids enters cavity A of the reprocessing shell assembly (700); S15, starting the driving motor (501), driving the rotating shaft assembly (800) to rotate, further crushing the solid impurities in the domestic sewage in the A chamber of the reprocessing shell assembly (700), and at the same time, the neutralized liquid enters the drainage pipe (900) after further treatment, and then flows into the designated pipeline; S16, when the domestic sewage in the first sedimentation tank (100) reaches a set low level, stop pumping; S17, stopping the operation of the driving motor (501); S18, when the domestic sewage in the second sedimentation tank (200) reaches a set high level, the domestic sewage is flowed into the first sedimentation tank (100); S19, adding a neutralizing agent to the second sedimentation tank (200) and performing precipitation; S20, pumping the domestic sewage in the second sedimentation tank (200) into the liquid separation pipe assembly (400); S21, repeating steps S14 and S15; S22, when the domestic sewage in the second sedimentation tank (200) reaches a set low level, stop pumping; S23, stop the operation of the driving motor (501).

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