Domestic sewage treatment device and method integrating multi-source sewage treatment functions

Abstract

The present invention provides a domestic sewage treatment device and method with integrated multi-source sewage treatment functions, belonging to the technical field of domestic sewage treatment. The device includes a first treatment unit, a second treatment unit, and a third treatment unit connected in sequence, wherein: the first treatment unit is adapted to perform a first biological treatment on sewage from a first sewage source under an aeration rate provided by a first aeration device; the second treatment unit is adapted to receive sewage from the first treatment unit and, depending on a sewage discharge mode, selectively receive sewage from a second sewage source and, depending on a sewage discharge mode, perform a second biological treatment on the received sewage under an aeration rate provided by the second aeration device; the third treatment unit is adapted to receive sewage treated from the second treatment unit and, depending on aeration rate provided by the third aeration device, perform a third biological treatment on the received sewage and discharge it; wherein the aeration rates provided by the first, second, and third aeration devices are each adjusted according to the sewage discharge mode.

Description

Technical Field

[0001] The present invention relates to the field of domestic sewage treatment, and in particular to a domestic sewage treatment device and method integrating multi-source sewage treatment functions. Background Art

[0002] Domestic sewage treatment solves the problem of sewage collection and discharge, offering both environmental and social benefits. Among the relevant domestic sewage treatment technologies and processes, the most commonly used include activated sludge, biofilm, membrane-bioreactor, and ecological treatment processes. The biofilm process used for treating domestic sewage in rural households is generally the biofilm method, and the process details are nearly identical. This presents a problem. Domestic sewage consists of two types of wastewater: blackwater and graywater, each with distinct properties. Domestic sewage discharge patterns generally fall into four categories: mixed blackwater and graywater discharge, separate blackwater and graywater discharge, separate blackwater discharge, and separate graywater discharge. Different discharge patterns generate different types of sewage sources, and different processes are suitable for these different types of wastewater. However, most rural areas utilize relatively uniform processes and technologies, without promoting and applying specialized technologies and equipment tailored to the specific pollution sources generated by different discharge patterns. For example, developing sewage treatment equipment specifically for treating mixed blackwater and graywater sources, or solely for treating separate graywater sources, makes it difficult to achieve efficient sewage treatment. However, developing a technical device for each sewage source under each drainage mode would be too sophisticated and would also limit the use of the equipment. If the drainage mode changes in the future, new sewage treatment problems will arise. Summary of the Invention

[0003] In view of this, in order to at least partially solve at least one of the above-mentioned technical problems, the present invention provides a domestic sewage treatment device and method integrating multi-source sewage treatment functions.

[0004] According to an embodiment of one aspect of the present invention, a domestic sewage treatment device with integrated multi-source sewage treatment functions is provided, comprising a first treatment unit, a second treatment unit and a third treatment unit connected in sequence, wherein: a first aeration device is provided inside the first treatment unit, which is suitable for receiving sewage from a first sewage source according to a sewage discharge mode, and performing a first biological treatment on the received sewage at an aeration rate provided by the first aeration device; a second aeration device is provided inside the second treatment unit, which is suitable for receiving sewage treated from the first treatment unit, and selectively receiving sewage from a second sewage source according to the sewage discharge mode; performing a second biological treatment on the received sewage at an aeration rate provided by the second aeration device; a third aeration device is provided inside the third treatment unit, which is suitable for receiving sewage treated from the second treatment unit, performing a third biological treatment on the received sewage at an aeration rate provided by the third aeration device, and discharging the sewage after the third biological treatment; wherein the aeration rates provided by the first aeration device, the second aeration device and the third aeration device are respectively adjusted according to the sewage discharge mode.

[0005] According to an embodiment of another aspect of the present invention, a method for treating domestic sewage using the domestic sewage treatment device as described above is provided, comprising the following steps: according to the sewage discharge mode, performing a first biological treatment on sewage from a first sewage source by a first treatment unit at an aeration amount provided by a first aeration device; according to the sewage discharge mode, performing a second biological treatment on sewage from the first treatment unit and selectively received sewage from a second sewage source by a second treatment unit at an aeration amount provided by a second aeration device; according to the sewage discharge mode, performing a third biological treatment on sewage from the second treatment unit by a third treatment unit at an aeration amount provided by a third aeration device, and discharging the sewage after the third biological treatment.

[0006] It can be seen from the above technical solutions that the domestic sewage treatment device and method with integrated multi-source sewage treatment functions of the present invention has at least one or part of the following beneficial effects:

[0007] According to an embodiment of the present invention, the present application respectively sets an aeration device in multiple treatment units arranged in series, and adjusts the opening and closing and aeration volume of each aeration device according to the sewage discharge mode, so that for multiple sewage sources under different drainage modes, different types of biological treatments such as aerobic treatment, anaerobic treatment, etc. are carried out in sequence in multiple treatment units through aeration volume control, thereby realizing the flexible integration of multi-source sewage treatment functions into a single sewage treatment equipment, and efficiently treating different types of sewage under different sewage discharge modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0009] Figure 1 A schematic top view of a domestic sewage treatment device integrating multi-source sewage treatment functions according to an embodiment of the present invention is shown;

[0010] Figure 2 A schematic side view of a domestic sewage treatment device integrating multi-source sewage treatment functions according to an embodiment of the present invention is shown;

[0011] Figure 3 A schematic flow chart of a domestic sewage treatment method integrating multi-source sewage treatment functions according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0012] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concept of the present invention.

[0013] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The term "comprising" used herein indicates the existence of features, steps, operations, but does not exclude the existence or addition of one or more other features.

[0014] When expressions such as “at least one of A, B, and C, etc.” are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art (for example, “a system having at least one of A, B, and C” should include but is not limited to systems having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc.). When expressions such as “at least one of A, B, or C, etc.” are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art (for example, “a system having at least one of A, B, or C” should include but is not limited to systems having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc.).

[0015] Wastewater discharged from daily life in rural towns and villages primarily consists of blackwater and graywater. Blackwater refers to wastewater discharged from water-using facilities like kitchens and bathrooms, which contains large amounts of organic matter and pollutants. Graywater, generated by washing and cleaning activities in water-using facilities like sinks and washing machines, contains relatively low levels of organic matter and pollutants. The properties of these two types of wastewater are completely different.

[0016] Regarding rural wastewater, the daily blackwater and graywater discharge patterns of rural residents have changed, broadly categorizing them into four types: mixed blackwater and graywater discharge, separate blackwater and graywater discharge, blackwater-only discharge, and graywater-only discharge. The nature of the wastewater sources containing blackwater and / or graywater varies significantly for each discharge pattern, yet there is a lack of sewage treatment equipment and methods that can effectively adapt to these diverse discharge patterns.

[0017] In the process of realizing the concept of the present invention, it was found that a domestic sewage treatment device and method were constructed based on the characteristics of black water, which has a smaller volume and higher concentration than gray water. For sewage source treatment corresponding to different drainage modes, the cascaded first treatment unit, second treatment unit and third treatment unit can be used to flexibly perform biological treatment on the sewage under different aeration amounts, so that organic matter and ammonia nitrogen in the sewage can be efficiently removed.

[0018] Specifically, according to an embodiment of one aspect of the present invention, a domestic sewage treatment device integrating multi-source sewage treatment functions is provided. Figure 1 A schematic top view of a domestic sewage treatment device integrating multi-source sewage treatment functions according to an embodiment of the present invention is shown; Figure 2 A schematic side view of a domestic sewage treatment device with integrated multi-source sewage treatment functions according to an embodiment of the present invention is shown. Figure 1 and Figure 2 As shown, the device 1 includes a first processing unit 11, a second processing unit 12 and a third processing unit 13 connected in sequence, wherein:

[0019] A first aeration device 112 is provided inside the first treatment unit 11, which is suitable for receiving sewage from a first sewage source according to a sewage discharge mode, and performing a first biological treatment on the received sewage at an aeration rate provided by the first aeration device 112; a second aeration device 122 is provided inside the second treatment unit 12, which is suitable for receiving sewage treated from the first treatment unit 11, and selectively receiving sewage from a second sewage source according to the sewage discharge mode; performing a second biological treatment on the received sewage at an aeration rate provided by the second aeration device 122; a third aeration device 132 is provided inside the third treatment unit 13, which is suitable for receiving sewage treated from the second treatment unit 12, performing a third biological treatment on the received sewage at an aeration rate provided by the third aeration device 132, and discharging the sewage after the third biological treatment; wherein the aeration rates provided by the first aeration device 112, the second aeration device 122 and the third aeration device 132 are respectively adjusted according to the sewage discharge mode.

[0020] According to embodiments of the present invention, discharge modes can include mixed discharge of blackwater and graywater, separate discharge of blackwater and graywater, and separate discharge of blackwater and graywater. Based on the characteristics of the sewage sources under different discharge modes, different aeration rates are adjusted within multiple treatment units to perform different types of biological treatment on the sewage. For example, combining aerobic and anaerobic treatments can achieve relatively complete removal of organic matter and ammonia nitrogen from the sewage. This allows for the flexible integration of multi-source sewage treatment functions within a single sewage treatment device, meeting the demand for efficient sewage treatment under diverse drainage modes.

[0021] According to an embodiment of the present invention, Figure 1 and 2 As shown, the first treatment unit 11 includes a first treatment cell 111, a first aeration device 112, and a first biological filler 113. The first treatment cell 111 is provided with a first water inlet 1111 connected to a first sewage source. The first aeration device 112 is located at the bottom of the first treatment cell 111. The first biological filler 113 is loaded inside the first treatment cell 111. The second treatment unit 12 includes a second treatment cell 121, a second aeration device 122, and a second biological filler 123. The second treatment cell 121 is provided with a second water inlet 1211 connected to a second sewage source. The second aeration device 122 is located at the bottom of the second treatment cell 121. The second biological filler 123 is loaded inside the second treatment cell 121. The third treatment unit 13 includes: a third treatment cell 131, a third aeration device 132 and a third biological filler 133; wherein the third treatment cell 131 is provided with a water outlet 1311, the third aeration device 132 is located at the bottom of the third treatment cell 131; and the third biological filler 133 is filled inside the third treatment cell 131.

[0022] With such an arrangement, it is possible to choose to receive sewage through the first treatment unit or simultaneously receive sewage through the first treatment unit and the second treatment unit according to the characteristics of the aforementioned different sewage discharge modes, and then perform different types of biological treatment in combination with the adjustment of different aeration amounts.

[0023] For example, when the sewage discharge mode is mixed discharge of black water and gray water, separate black water discharge or separate gray water discharge, there is only a single sewage source, namely the first sewage source, then the first water inlet 1111 of the first treatment chamber 111 can be connected to the first sewage source, and the second water inlet 1211 of the second treatment chamber 121 can be closed. Thus, the sewage is biologically treated in sequence using the first treatment unit 11, the second treatment unit 12 and the third treatment unit 13, which can more fully remove organic matter and ammonia nitrogen.

[0024] For another example, when the sewage discharge mode is the separate discharge of black water and gray water, there are two sewage sources. The first sewage source can be a black water discharge source, which has the characteristics of a small water volume and a large number of pollutants, and the second sewage source can be a gray water discharge source, which has the characteristics of a large water volume and a small number of pollutants. The first water inlet 1111 of the first treatment cell 111 is connected to the first sewage source, and the second water inlet 1211 of the second treatment cell 121 is connected to the second sewage source. In this way, the black water passes through the first treatment unit 11, the second treatment unit 12, and the third treatment unit 13 in sequence for biological treatment, and the gray water passes through the second treatment unit 12 and the third treatment unit 13 in sequence for biological treatment. This can more fully remove organic matter and ammonia nitrogen in the sewage when the black water and gray water are separated and discharged.

[0025] According to an embodiment of the present invention, further optionally, the effective volume of the first processing cell 111 is 1 / 3 to 2 / 3 of the effective volume of the second processing cell 121, for example, 1 / 3, 2 / 5, 1 / 2, 3 / 5, 2 / 3, etc. And / or, the effective volume of the third processing cell 131 is 1 / 3 to 2 / 3 of the effective volume of the second processing cell 121, for example, 1 / 3, 2 / 5, 1 / 2, 3 / 5, 2 / 3, etc. Here, "effective volume" refers to the actual, usable water volume of the first, second, and third processing cells, excluding reserved space and space occupied by components such as aeration devices.

[0026] The first, second and third treatment chambers can be, for example, septic tanks. The effective volume of the second treatment chamber 121 is larger than the effective volumes of the first treatment chamber 111 and the third treatment chamber 131, so that high-load aerobic reactions and anaerobic / anoxic reactions with slower growth of functional microorganisms can be designed, which is beneficial to the removal of organic matter and ammonia nitrogen.

[0027] According to an embodiment of the present invention, the first biological filler 113 and the third biological filler 133 are polyurethane sponge fillers, and the second biological filler 123 is a spherical filler.

[0028] This arrangement is because the functional microorganisms in the second processing cell 121 have a long generation cycle, small size, and are easy to lose, so a polyurethane sponge filler with small gaps and good microorganism interception and enrichment efficiency is selected. The first processing cell 111 and the third processing cell 131 are suitable for aerobic, anoxic and precipitation reactions, so spherical fillers with strong fluidity are selected.

[0029] According to an embodiment of the present invention, the sewage discharge mode is a mixed discharge of black water and gray water. The sewage received by the first treatment unit from the first sewage source is a mixed sewage of black water and gray water. The aeration rate per unit volume of the first aeration device is 0~2min -1 , for example, it can be 0 min -1 , 0.5 min -1, 1 min -1 , 1.5 min -1 , 2 min -1 The second treatment unit does not receive sewage from the second sewage source, and the aeration capacity per unit volume of the second aeration device is 4~6 min -1 , for example, it can be 4 minutes -1 , 4.5 min -1 5 min -1 5.5 min -1 , 6 min -1 etc.; the aeration rate per unit volume of the third aeration device is 0 min -1 .

[0030] With this arrangement, the sewage can be fully treated in the first to third treatment units. At this time, water is selected to enter from the first water inlet 1111 of the first treatment cell 111, and the second water inlet 1211 of the second treatment cell 121 is closed. The sewage enters the first treatment cell and passes through 0~3 min. -1 Aeration volume is used to create the conditions for simultaneous nitrification and denitrification, and then the second treatment cell 121 is used to -1 The aeration volume is beneficial to fully remove organic matter and ammonia nitrogen in the sewage before the effluent is discharged, and then, when the third treatment cell 131 is not aerated, a sedimentation process before the effluent is discharged is constructed.

[0031] According to an embodiment of the present invention, the sewage discharge mode is the separation and discharge of black water and gray water. The sewage received by the first treatment unit from the first sewage source is black water. The aeration rate per unit volume of the first aeration device is 6-9 min. -1 The sewage received by the second treatment unit from the second sewage source is gray water, and the aeration rate per unit volume of the second aeration device is 0 min -1 ; The aeration rate per unit volume of the third aeration device is 4~6 min -1 .

[0032] With this arrangement, black water and gray water enter the domestic sewage treatment device from two different water inlets. Compared to gray water, black water has a smaller volume and higher concentration. Through the first treatment cell 111, which has a smaller effective volume than the second treatment cell 121, a relatively large aeration volume is used to achieve partial nitrification and organic matter removal reactions. Approximately 60% of the ammonia nitrogen in the black water is converted to nitrous oxide, and more than 80% of the organic matter is removed. The sewage then enters the second treatment cell 121 and, without aeration, undergoes a denitrification reaction with the stabilized gray water in the second treatment cell 121, removing the nitrous oxide generated in the black water while consuming the organic matter in the gray water. After the black water and gray water are mixed and treated, they enter the third treatment cell 131, which uses a relatively large aeration volume to fully remove the organic matter and ammonia nitrogen in the wastewater before discharge.

[0033] According to an embodiment of the present invention, the sewage discharge mode is to discharge black water alone. The sewage received by the first treatment unit 11 from the first sewage source is black water. The aeration rate per unit volume of the first aeration device 112 is 6-9 min. -1 The second treatment unit 12 does not receive sewage from the second sewage source, and the aeration rate per unit volume of the second aeration device 122 is 0 min -1 The aeration rate per unit volume of the third aeration device 132 is 6~9 min -1 .

[0034] In this configuration, black water is selected to be connected from the first water inlet 1111 of the first treatment cell 111, and the second water inlet 1211 is closed at the same time; in order to ensure that the black water can reach the discharge target after being treated in the three treatment cells, a process of partial nitritation of black water combined with anaerobic ammonia oxidation is selectively constructed by adopting different aeration amounts, an aerobic reaction is constructed in the first treatment cell 111 to cause partial nitritation of ammonia nitrogen, an anaerobic reaction is constructed in the second treatment cell 121 to cause anaerobic ammonia oxidation, and then a higher aeration amount is used in the third treatment cell 131 to achieve sufficient removal of organic matter and ammonia nitrogen and oxygenation.

[0035] According to an embodiment of the present invention, the sewage discharge mode is to discharge gray water separately. The sewage received by the first treatment unit 11 from the first sewage source is gray water. The aeration rate per unit volume of the first aeration device 112 is 3-4.5 min. -1 The second treatment unit 12 does not receive sewage from the second sewage source, and the aeration rate per unit volume of the second aeration device 122 is 1.5~3 min -1 The aeration rate per unit volume of the third aeration device 132 is 0 min -1 .

[0036] With such a configuration, access is selected from the first water inlet 1111 of the first treatment cell 111, and the second water inlet 1211 of the second treatment cell 121 is closed at the same time; since the pollutant concentration in the grey water is low and is mainly organic matter, a higher aeration volume is used in the first treatment cell to remove most of the organic matter and a small amount of ammonia nitrogen in the grey water through aerobic oxidation; then a lower aeration volume is used in the second treatment cell 121 to complete the oxygenation process before water discharge on the basis of reasonable energy conservation according to the nature of the incoming water; and non-aeration conditions are adopted in the third treatment cell to construct a sedimentation process before water discharge.

[0037] According to an embodiment of the present invention, the sewage discharge mode is a mixed discharge of black water and gray water, and the residence time of the first treatment chamber is 2 to 4 hours, for example, it can be 2 hours, 2.5 hours, 3.0 hours, 3.5 hours, 3.8 hours, 4 hours, etc.; or the sewage discharge mode is separate discharge of black water and gray water, and the residence time of the first treatment chamber 111 is 14 to 20 hours, for example, it can be 14 hours, 15 hours, 16 hours, 17 hours, 18 hours, 19 hours, 20 hours; or, the sewage discharge mode is to discharge black water alone, and the residence time of the first treatment chamber 111 is 14 to 20 hours, for example, it can be 14 hours, 15 hours, 16 hours, 17 hours, 18 hours, 19 hours, 20 hours; or, the sewage discharge mode is to discharge gray water alone, and the residence time of the first treatment chamber 111 is 4 to 8 hours, for example, it can be 4 hours, 5 hours, 6 hours, 6,5 7 hours, 7.5 hours, 8 hours, etc.

[0038] When the effective volumes of the first treatment cell 111 and the third treatment cell 131 are similar and both are smaller than the effective volume of the second treatment cell 121, the residence time of the first treatment cell 111 and the third treatment cell 131 is 1 / 3 to 2 / 3 of the residence time of the second treatment cell 121. Thus, under different sewage discharge modes, the setting of the residence time can ensure that the sewage is fully treated and reacted in the first to third treatment cells.

[0039] According to another embodiment of the present invention, a domestic sewage treatment method integrating multi-source sewage treatment functions is provided. Figure 3 FIG. 1 is a flow chart showing a method for treating domestic sewage with integrated multi-source sewage treatment functions according to an embodiment of the present invention; FIG. Figure 3 As shown, the method is implemented by utilizing the domestic sewage treatment device integrating the multi-source sewage treatment functions, and specifically includes operations S1 to S3.

[0040] In operation S1 , sewage from a first sewage source is subjected to a first biological treatment by a first treatment unit under an aeration amount provided by a first aeration device according to a sewage discharge mode.

[0041] In operation S2, according to the sewage discharge mode, the sewage from the first treatment unit and the sewage selectively received from the second sewage source are subjected to a second biological treatment by the second treatment unit under an aeration amount provided by the second aeration device.

[0042] In operation S3 , according to the sewage discharge mode, the sewage from the second treatment unit is subjected to a third biological treatment by the third treatment unit under an aeration amount provided by the third aeration device, and the sewage after the third biological treatment is discharged.

[0043] According to an embodiment of the present invention, in the above-described domestic sewage treatment method, the structural design of the first through third treatment units is the same as described above and will not be further described here. The water inlet configuration of the first and second treatment units is determined based on the sewage discharge pattern, while the aeration volume of the first through third aeration devices is adjusted based on the sewage discharge pattern. The details are the same as described above and will not be further described here.

[0044] The following further illustrates the domestic sewage treatment device and method of the present invention by taking four domestic sewage discharge modes occurring in a village as an example.

[0045] The four types of domestic sewage in the village are: (1) mixed discharge of black and gray water. This type of household completed the toilet renovation using the water-flushing toilet + three-compartment septic tank model, and discharged the gray water directly into the three-compartment septic tank. The effluent from the three-compartment septic tank needs further treatment from the perspective of both hygiene and environmental safety; (2) separate discharge of black and gray water. This type of household completed the toilet renovation using the water-flushing toilet + three-compartment septic tank model, but the gray water was not treated or only simply treated, and the gray water was not connected to the three-compartment septic tank. This part of black water has safety issues when entering the farmland as fertilizer, and needs to be harmlessly treated. At the same time, the gray water drainage problem needs to be solved; (3) only black water discharge. This type of household completed the toilet renovation using the water-flushing toilet + three-compartment septic tank model, and the black water needs to be harmlessly treated, and the gray water is not collected and treated; (4) only gray water discharge. The toilet was not renovated or the toilet was renovated in the form of dry toilets, and only the directly discharged gray water needs to be treated.

[0046] A batch of domestic sewage treatment devices with integrated multi-source sewage treatment functions of the present invention are installed and used in each household in the village to treat different types of sewage. The volume of the household device is about 0.8 m 3 , including the first processing cell 111, the second processing cell 121 and the third processing cell 131, with volumes of 0.2, 0.4 and 0.2 m respectively 3 , each treatment cell is provided with an aeration component with controllable aeration volume, and the aeration component adopts multiple aeration gears. Spherical fillers are placed in the first treatment cell 111 and the third treatment cell 131, and polyurethane sponge fillers are placed in the second treatment cell 121; the three treatment cells are connected by pipes, the first and second treatment cells are respectively provided with water inlets, and the third treatment cell is provided with a water outlet. When the first treatment cell 111 treats mixed sewage of black and gray water, the residence time is 4.5 hours, when treating black water, the residence time is 16 hours, and when treating gray water, the residence time is 6.5 hours. The aeration volume settings shown in the following Table 1 are made for different discharge modes.

[0047] Table 1

[0048]

[0049] Based on different sewage discharge modes, the wastewater quality of the first to third treatment cells was tested for COD, ammonia nitrogen, and total nitrogen. COD was determined using the potassium dichromate method, total nitrogen was determined using potassium persulfate oxidation followed by UV spectrophotometry, and ammonia nitrogen was determined using Nessler's reagent photometry. The test results are shown in Tables 2-1 to 2-4 below. As shown in Tables 2-1 to 2-4, efficient treatment of black and gray water can be achieved by flexibly adjusting the aeration rate under different sewage discharge modes.

[0050] Table 2-1 Mixed discharge of black water and grey water (unit, mg / L)

[0051]

[0052] Table 2-2 Blackwater and greywater separation emissions (unit, mg / L)

[0053]

[0054] Table 2-3 Blackwater Discharge Separately (Unit, mg / L)

[0055]

[0056] Table 2-4 Separate discharge of gray water (unit, mg / L)

[0057]

[0058] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A domestic sewage treatment device with integrated multi-source sewage treatment functions, comprising a first treatment unit, a second treatment unit, and a third treatment unit connected in sequence, wherein: The first treatment unit is provided with a first aeration device inside, adapted to receive sewage from a first sewage source according to a sewage discharge mode, and perform a first biological treatment on the received sewage under an aeration rate provided by the first aeration device; The second treatment unit is provided with a second aeration device inside, adapted to receive the sewage treated by the first treatment unit and selectively receive sewage from a second sewage source according to the sewage discharge mode, and perform a second biological treatment on the received sewage under the aeration amount provided by the second aeration device; The third treatment unit is provided with a third aeration device inside, which is adapted to receive the sewage treated by the second treatment unit, perform a third biological treatment on the received sewage under the aeration volume provided by the third aeration device, and discharge the sewage after the third biological treatment; Wherein, the aeration amount provided by each of the first aeration device, the second aeration device and the third aeration device is adjusted according to the sewage discharge mode.

2. The domestic sewage treatment device according to claim 1, wherein: The first treatment unit includes: a first treatment cell, the first aeration device, and a first biological filler; wherein the first treatment cell is provided with a first water inlet connected to the first sewage source; the first aeration device is located at the bottom of the first treatment cell; and the first biological filler is filled in the interior of the first treatment cell; The second treatment unit comprises: a second treatment cell, a second aeration device, and a second biological filler; wherein the second treatment cell is provided with a second water inlet connected to the second sewage source; the second aeration device is located at the bottom of the second treatment cell; and the second biological filler is filled in the interior of the second treatment cell; The third treatment unit includes: a third treatment cell, the third aeration device and a third biological filler; wherein the third treatment cell is provided with a water outlet, the third aeration device is located at the bottom of the third treatment cell; and the third biological filler is filled inside the third treatment cell.

3. The domestic sewage treatment device according to claim 2, wherein: The effective volume of the first processing chamber is 1 / 3 to 2 / 3 of the effective volume of the second processing chamber; and / or the effective volume of the third processing chamber is 1 / 3 to 2 / 3 of the effective volume of the second processing chamber.

4. The domestic sewage treatment device according to claim 2, wherein: The first biological filler and the third biological filler are respectively polyurethane sponge fillers, and the second biological filler is a spherical filler.

5. The domestic sewage treatment device according to claim 2, wherein: The sewage discharge mode is a mixture of black water and gray water. The sewage received by the first treatment unit from the first sewage source is a mixture of black water and gray water. The aeration rate per unit volume of the first aeration device is 0-2 min. -1 ; The second treatment unit does not receive sewage from the second sewage source, and the aeration rate per unit volume of the second aeration device is 4-6 min -1 ; The aeration rate per unit volume of the third aeration device is 0 min -1 .

6. The domestic sewage treatment device according to claim 2, wherein: The sewage discharge mode is the separation and discharge of black water and gray water. The sewage received by the first treatment unit from the first sewage source is black water. The aeration capacity per unit volume of the first aeration device is 6-9 min. -1 ; The sewage received by the second treatment unit from the second sewage source is gray water, and the aeration rate per unit volume of the second aeration device is 0 min -1 ; The aeration rate per unit volume of the third aeration device is 4 to 6 min -1 .

7. The domestic sewage treatment device according to claim 2, wherein: The sewage discharge mode is to discharge black water separately. The sewage received by the first treatment unit from the first sewage source is black water. The aeration rate per unit volume of the first aeration device is 6-9 min. -1 ; The second treatment unit does not receive sewage from the second sewage source, and the aeration rate per unit volume of the second aeration device is 0 min -1 ; The aeration rate per unit volume of the third aeration device is 6-9 min -1 .

8. The domestic sewage treatment device according to claim 2, wherein: The sewage discharge mode is to discharge gray water separately. The sewage received by the first treatment unit from the first sewage source is gray water. The aeration capacity per unit volume of the first aeration device is 3-4.5 min. -1 ; The second treatment unit does not receive sewage from the second sewage source, and the aeration rate per unit volume of the second aeration device is 1.5-3 min -1 ; The aeration rate per unit volume of the third aeration device is 0 min -1 .

9. The domestic sewage treatment device according to any one of claims 5 to 8, wherein: The sewage discharge mode is a mixed discharge of black water and gray water, and the residence time of the first treatment cell is 2 to 4 hours; or, The sewage discharge mode is the separation and discharge of black water and gray water, and the residence time of the first treatment cell is 14 to 20 hours; or, The sewage discharge mode is to discharge black water alone, and the residence time of the first treatment cell is 14 to 20 hours; or The sewage discharge mode is to discharge gray water separately, and the residence time of the first treatment chamber is 4 to 8 hours.

10. A method for treating domestic sewage using the domestic sewage treatment device according to any one of claims 1 to 9, comprising the following steps: According to the sewage discharge mode, the sewage from the first sewage source is subjected to a first biological treatment by the first treatment unit under an aeration amount provided by the first aeration device; According to the sewage discharge mode, the sewage from the first treatment unit and the sewage selectively received from the second sewage source are subjected to a second biological treatment by the second treatment unit under the aeration amount provided by the second aeration device; According to the sewage discharge mode, the sewage from the second treatment unit is subjected to a third biological treatment by the third treatment unit under the aeration amount provided by the third aeration device, and the sewage after the third biological treatment is discharged.

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