Multi-source sewage treatment function integrated domestic sewage treatment device and method

Abstract

The invention provides a multi-source sewage treatment function integrated domestic sewage treatment device and method, and belongs to the technical field of domestic sewage treatment. The device comprises a first treatment unit, a second treatment unit and a third treatment unit which are sequentially communicated, wherein the first treatment unit is suitable for performing first biological treatment on sewage of a first sewage source under the aeration quantity provided by a first aeration device; the second treatment unit is suitable for receiving sewage from the first treatment unit, selectively receiving sewage from a second sewage source according to a sewage discharge mode, and performing second biological treatment on the received sewage under the aeration quantity provided by a second aeration device; the third treatment unit is suitable for receiving the sewage treated by the second treatment unit, performing third biological treatment on the received sewage under the aeration quantity provided by a third aeration device, and discharging the sewage; wherein the aeration quantity provided by each of the first aeration device, the second aeration device and the third aeration device is adjusted according to a pollution 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, and has environmental and social benefits. Among the relevant domestic sewage treatment technologies and processes, the more commonly used technologies and processes include activated sludge, biofilm, membrane-biology, and ecological treatment processes. The process used for domestic sewage treatment in rural households is generally the biofilm method, and the process details are almost the same. This poses a problem. Domestic sewage includes two types of wastewater: black water and gray water, and the properties of these two types of wastewater are completely different. After the three-year toilet reform activity from 2018 to 2020, the domestic sewage discharge pattern in rural areas of my country has changed, roughly including four types of drainage modes, namely, mixed discharge of black and gray water, separate discharge of black and gray water, separate discharge of black water, and separate discharge of gray water. Different drainage modes produce sewage sources of different natures, and different processes are applicable to sewage of different natures. However, most rural areas promote relatively consistent process technologies, and do not promote the application of different technical equipment for pollution sources of different natures generated under different drainage modes, such as developing sewage equipment that is only used to treat mixed discharge sources of black and gray water, and sewage equipment that is only used to treat separate discharge sources of gray water, which 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 later, 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, there is provided 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: a first aeration device is arranged 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 amount provided by the first aeration device; a second aeration device is arranged 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 amount provided by the second aeration device; a third aeration device is arranged 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 amount provided by the third aeration device, and discharging the sewage after the third biological treatment; wherein the aeration amounts 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, there is provided a method for treating domestic sewage using the domestic sewage treatment device as described above, comprising the following steps: according to a 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 a plurality of 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 as to realize different types of biological treatments such as aerobic treatment, anaerobic treatment, etc. in sequence in a plurality of treatment units through aeration volume control for multiple sewage sources under different drainage modes, thereby realizing 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 with integrated 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] Below, 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 concepts 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] In the case of using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally 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 a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.). In the case of using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally 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 a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0015] Wastewater discharged from daily life of villagers and towns mainly includes black water and grey water. Black water refers to sewage discharged from water facilities such as kitchens and toilets, which contains a large amount of organic matter and pollutants; grey water refers to sewage generated by washing and cleaning activities of water facilities such as sinks and washing machines, which has a relatively low content of organic matter and pollutants. The properties of black water and grey water are completely different.

[0016] As for village and town sewage, the daily blackwater and greywater discharge patterns of village and town residents have changed, and roughly include four types of sewage discharge patterns, namely, mixed discharge of blackwater and greywater, separate discharge of blackwater and greywater, single discharge of blackwater, and single discharge of greywater. For different sewage discharge patterns, the properties of sewage sources containing blackwater and / or greywater vary greatly, but there is still a lack of sewage treatment devices and methods that can better adapt to different sewage 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 in view of the characteristics of black water having a smaller volume and higher concentration than gray water. For sewage source treatment corresponding to different drainage modes, the cascaded first treatment unit, the second treatment unit and the 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 with integrated 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 comprises a first processing unit 11, a second processing unit 12 and a third processing unit 13 connected in sequence, wherein:

[0019] The first treatment unit 11 is provided with a first aeration device 112, 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; the second treatment unit 12 is provided with a second aeration device 122, which is suitable for receiving sewage treated from the first treatment unit 11, and selectively receiving sewage from a second sewage source according to a sewage discharge mode; performing a second biological treatment on the received sewage at an aeration rate provided by the second aeration device 122; the third treatment unit 13 is provided with a third aeration device 132, 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 the embodiments of the present invention, the discharge mode can be mixed discharge of black water and gray water, separate discharge of black water and gray water, separate discharge of black water and separate discharge of gray water. According to the characteristics of the sewage source under different discharge modes, different aeration amounts are adjusted in multiple treatment units to perform different types of biological treatment on the sewage. For example, organic matter and ammonia nitrogen in the sewage can be more fully removed by combining aerobic treatment and anaerobic treatment. In this way, the multi-source sewage treatment function is flexibly integrated into a sewage treatment device, meeting the demand for high-efficiency 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; wherein 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; and the first biological filler 113 is filled 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; wherein 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; and the second biological filler 113 is filled 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 arrangement, it is possible to select, according to the characteristics of the aforementioned different sewage discharge modes, to receive sewage through the first treatment unit, or to select to receive sewage through both the first treatment unit and the second treatment unit at the same time, 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 a mixed discharge of black water and gray water, a single black water discharge, or a single gray water discharge, there is only a single sewage source, namely the first sewage source, and 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 can be biologically treated in sequence by using the first treatment unit 11, the second treatment unit 12, and the third treatment unit 13, so that organic matter and ammonia nitrogen can be removed more fully.

[0024] For another example, when the sewage discharge mode is the separation of black water and gray water, there are two sewage sources, then the first sewage source can be a black water discharge source, which has the characteristics of small water volume and more pollutants, and the second sewage source can be a gray water discharge source, which has the characteristics of large water volume and fewer 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. Thus, the black water is biologically treated by the first treatment unit 11, the second treatment unit 12 and the third treatment unit 13 in sequence, and the gray water is biologically treated by the second treatment unit 12 and the third treatment unit 13 in sequence, which 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, it can be 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, it can be 1 / 3, 2 / 5, 1 / 2, 3 / 5, 2 / 3, etc. Here, "effective volume" refers to the actual, available water volume in the first, second and third processing cells after removing the reserved space and the space occupied by components such as aeration devices.

[0026] The first, second and third treatment chambers may 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 the embodiment of the present invention, the first biological filler 113 and the third biological filler 133 are polyurethane sponge fillers respectively, and the second biological filler 123 is a spherical filler.

[0028] This arrangement is because the functional microorganisms in the second processing chamber 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 chamber 111 and the third processing chamber 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, and 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 rate per unit volume of the second aeration device is 4-6 min. -1 , for example, it can be 4 min -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 The aeration volume is used to construct the conditions for simultaneous nitrification and denitrification, and then the second treatment cell 121 is used to adopt 6~9 min -1 The aeration volume is beneficial to fully remove organic matter and ammonia nitrogen in the sewage before the effluent is discharged, and then construct a sedimentation process before the effluent is discharged when the third treatment cell 131 is not aerated.

[0031] According to an embodiment of the present invention, the sewage discharge mode is black water and gray water separated and discharged, the sewage received by the first treatment unit from the first sewage source is black water, and 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] In this way, black water and gray water enter the domestic sewage treatment device from two different water inlets. Compared with gray water, black water has a smaller volume and a higher concentration. The first treatment cell 111, which has a smaller effective volume than the second treatment cell 121, realizes partial nitrite and organic matter removal reaction under the condition of a larger aeration volume, and about 60% of the ammonia nitrogen in the black water is converted into nitrous acid, and more than 80% of the organic matter is removed; then the sewage enters the second treatment cell 121, and under the condition of no aeration, it undergoes a denitrification reaction with the stabilized gray water in the second treatment cell 121, removing the nitrous acid 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 121, and a larger aeration volume is used to fully remove the organic matter and ammonia nitrogen in the wastewater before the effluent is discharged.

[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 to 9 min -1 .

[0034] In this configuration, black water is connected to the first water inlet 1111 of the first treatment chamber 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 chambers, a process of partial nitrite formation 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 chamber 111 to partially nitrite the ammonia nitrogen, an anaerobic reaction is constructed in the second treatment chamber 121 to cause anaerobic ammonia oxidation, and then a higher aeration amount is used in the third functional chamber 131 to achieve full 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 alone. 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 arrangement, access is selected from the first water inlet 1111 of the first treatment format 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 relatively low and is mainly organic matter, a relatively high aeration volume is used in the first functional chamber to remove most of the organic matter in the grey water and a small amount of ammonia nitrogen therein through aerobic oxidation; a relatively low aeration volume is then used in the second treatment cell 121 to complete the oxygenation process before discharge on the basis of reasonably saving electric energy according to the nature of the incoming water; non-aeration conditions are used in the third treatment cell to construct a sedimentation process before discharge of the effluent.

[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 a 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 a single discharge of black 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 a single discharge of gray water, 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, in different sewage discharge modes, by setting the residence time, it can be ensured 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 method for treating domestic sewage with integrated multi-source sewage treatment functions is provided. Figure 3 The flowchart of the domestic sewage treatment method integrating multi-source sewage treatment functions according to an embodiment of the present invention is shown; 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 , according to the sewage discharge mode, 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.

[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 the 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 subjected to the third biological treatment is discharged.

[0043] According to an embodiment of the present invention, in the above-mentioned domestic sewage treatment method, the structural design of the first to third treatment units is the same as that in the previous text, and will not be repeated here. The water inlet configuration of the first and second treatment units is determined according to the sewage discharge mode, and the aeration amount of the first to third aeration devices is adjusted according to the sewage discharge mode, which is the same as that in the previous text, and will not be repeated here.

[0044] The following is a further explanation of 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 directly discharged the gray water into the three-compartment septic tank. The effluent from the three-compartment septic tank needs further treatment from the perspective of 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. 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 a dry toilet, 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 this village to treat different types of sewage. The volume of the household device is about 0.8 m 3 , including a first processing cell 111, a second processing cell 121 and a third processing cell 131, with volumes of 0.2, 0.4 and 0.2 m 3 , an aeration component with controllable aeration volume is provided in each treatment cell, 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 functional chamber is provided with a water outlet. When the first treatment cell 111 treats black and gray water mixed sewage, 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 Table 1 below are made for different discharge modes.

[0047] Table 1

[0048]

[0049] According to different sewage discharge modes, the sewage water quality of the first to third treatment cells is tested for COD, ammonia nitrogen and total nitrogen. The potassium dichromate method can be used to determine COD, the potassium persulfate oxidation and then the UV spectrophotometry method can be used to determine total nitrogen, and the Nessler reagent photometry method can be used to determine ammonia nitrogen. The test results are shown in Tables 2-1 to 2-4. As shown in Tables 2-1 to 2-4, under different sewage discharge modes, efficient treatment of black and gray water can be achieved by flexibly adjusting the aeration volume.

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

[0051]

[0052] Table 2-2 Black water and grey water separation discharge (unit, mg / L)

[0053]

[0054] Table 2-3 Black water discharged separately (unit, mg / L)

[0055]

[0056] Table 2-4 Separate discharge of grey 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 description is only a specific embodiment of the present invention and is 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, which is 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 amount provided by the first aeration device; The second treatment unit is provided with a second aeration device inside, which is suitable for receiving the sewage treated by 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 under the aeration amount provided by the second aeration device; The third treatment unit is provided with a third aeration device inside, which is suitable for receiving the sewage treated by the second treatment unit, performing a third biological treatment on the received sewage under the aeration amount provided by the third aeration device, and discharging the sewage after the third biological treatment; Wherein, the aeration amounts provided by the first aeration device, the second aeration device and the third aeration device are respectively adjusted according to the sewage discharge mode.

2. The domestic sewage treatment device according to claim 1, wherein: The first treatment unit comprises: 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 inside the first treatment cell; The second treatment unit comprises: a second treatment cell, the 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 inside the second treatment cell; The third treatment unit comprises: a third treatment cell, a 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 polyurethane sponge fillers respectively, and the second biological filler is a spherical filler.

5. The domestic sewage treatment device according to claim 1, wherein: 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 0-2 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 1, wherein: The sewage discharge mode is black water and gray water separated and discharged, the sewage received by the first treatment unit from the first sewage source is black water, and 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 .

7. The domestic sewage treatment device according to claim 1, wherein: The sewage discharge mode is to discharge black water alone. 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 1, 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 rate 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 grey 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 grey 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 subjected to the third biological treatment is discharged.

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