Sewage treatment system

Abstract

The utility model relates to a sewage treatment system which comprises an adjusting tank, an air flotation device, a filter, a clean water tank, a first backflow channel and a second backflow channel which are sequentially communicated, a COD sensor is arranged in the clean water tank, an inlet of the first backflow channel is communicated with the filter, and an inlet of the second backflow channel is communicated with the air flotation device. Outlets of the second backflow channel and the first backflow channel are both communicated with the adjusting tank, the first backflow channel and the second backflow channel are respectively provided with a first control valve and a second control valve which are electrically connected with the COD sensor, and the second control valve and the first control valve are configured as follows: when a numerical value detected by the COD sensor is greater than a threshold value, the COD sensor is started; the first control valve opens the first backflow channel, and the second control valve opens the second backflow channel; and when the numerical value detected by the COD sensor is smaller than or equal to the threshold value, the first backflow channel and the second backflow channel are both in a closed state. The water quality of the water remained in the clean water tank can better meet the requirement, namely, the water remained under the abnormal condition is reduced.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system. Background Technology

[0002] Production and domestic wastewater flows by gravity through sewage pipes to a collection tank, where it is then pumped to an aeration and equalization tank for primary treatment. The primary treated wastewater undergoes sedimentation, coagulation, flocculation, and oxidation processes before flowing to an air flotation unit. Compressed air is dissolved in the water to reach a certain pressure, which is then pumped to a release device, forming a milky white dissolved air solution that mixes with the wastewater, causing the flocculent particles to float and thus removing suspended solids. The wastewater treated by the air flotation unit flows to a filter for filtration and is then stored in a clear water tank. The water in the clear water tank is used for irrigation of the entire plant's green spaces.

[0003] However, the water in the clear water pool may be substandard, indicating an abnormal operating condition that fails to meet the requirements for greening irrigation. Utility Model Content

[0004] Therefore, it is necessary to provide a wastewater treatment system that reduces water retention under abnormal operating conditions.

[0005] This application provides a wastewater treatment system, including an equalization tank, a flotation device, a filter, and a clear water tank connected in sequence. A COD sensor is installed in the clear water tank. The wastewater treatment system also includes a first return channel and a second return channel. The inlet of the first return channel is connected to the filter, and the inlet of the second return channel is connected to the flotation device. The outlets of both the second and first return channels are connected to the equalization tank. A first control valve and a second control valve electrically connected to the COD sensor are respectively installed on the first and second return channels. The second and first control valves are configured such that: when the value detected by the COD sensor is greater than a threshold, the first control valve opens the first return channel, and the second control valve opens the second return channel; when the value detected by the COD sensor is less than or equal to the threshold, both the first and second return channels are closed.

[0006] In one embodiment, the clear water tank is connected to the first return channel via a water pipe. A third control valve is installed on the water pipe. The third control valve is electrically connected to the signal output terminal of the COD sensor, and the third control valve is configured to: open the water pipe when the value detected by the COD sensor is less than or equal to a threshold; and close the water pipe when the value detected by the COD sensor is greater than the threshold.

[0007] In one embodiment, the first return channel is provided with a connection port that communicates with the inlet of the water pipe, and the connection port is located upstream of the first control valve along the fluid flow path within the first return channel.

[0008] In one embodiment, the wastewater treatment system further includes a backwash channel and an inlet channel, the clear water tank is connected to the filter through the inlet channel, and the filter is connected to the equalization tank through the backwash channel.

[0009] In one embodiment, a fourth control valve is provided on the backwash channel to open and close the backwash channel.

[0010] In one embodiment, the clear water tank is located below the filter.

[0011] In one embodiment, the wastewater treatment system further includes a connecting channel connected to the equalization tank, wherein the outlets of the first return channel and the second return channel are both connected to the connecting channel.

[0012] In one embodiment, the regulating tank is located below the air flotation device, and the regulating tank is connected to the air flotation device through an outlet pipe, on which a first water pump is installed.

[0013] In one embodiment, the wastewater treatment system further includes a transfer tank, through which the air flotation device is connected to the filter.

[0014] In one embodiment, the flotation device and the filter are both located above the transfer tank, and the flotation device is connected to the transfer tank through an outlet channel. The transfer tank is connected to the filter through a water flow channel, and a second water pump is installed on the water flow channel.

[0015] Compared with existing technologies, in the wastewater treatment system provided in this application, after wastewater enters the equalization tank, it is treated sequentially by an air flotation device and a filter before entering the clear water tank. At this time, the first and second return channels are closed. When the COD sensor detects abnormal data in the clear water tank, i.e., the value exceeds the threshold, the first control valve opens the first return channel, and the second control valve opens the second return channel. The water filtered by the filter returns to the equalization tank through the first return channel, while the water treated by the air flotation device returns to the equalization tank through the second return channel, thus circulating the treatment and ensuring that the water quality of the water remaining in the clear water tank better meets the requirements, i.e., reducing the amount of water remaining under abnormal conditions. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a wastewater treatment system according to an embodiment of this application.

[0018] Reference numerals: 1. Equalization tank; 11. Outlet pipe; 12. First water pump; 13. Connecting channel; 2. Air flotation device; 21. Outlet channel; 3. Filter; 31. Backwash channel; 32. Fourth control valve; 4. Clear water tank; 41. COD sensor; 42. Inlet channel; 5. First return channel; 51. First channel; 52. Second channel; 511. First control valve; 512. Connecting port; 6. Second return channel; 61. Second control valve; 7. Transfer tank; 71. Water flow channel; 72. Second water pump; 73. Water pipe; 74. Third control valve. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," "side," "top," "bottom," and similar expressions used in this application's specification are merely for describing various exemplary structural parts and elements of this application. However, their use herein is for illustrative purposes only and is determined based on the exemplary orientations shown in the accompanying drawings, and does not represent the only possible implementation. Since the embodiments disclosed in this application can be arranged in different orientations, these terms indicating orientation are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] It should be noted that "axial arrangement" means that the overall arrangement direction is along the axial direction, including but not limited to axial extension, and may be at an angle to the axial direction.

[0024] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0025] like Figure 1 As shown, this application discloses a wastewater treatment system. The wastewater treatment system includes an equalization tank 1, a flotation device 2, a filter 3, a clear water tank 4, a first return channel 5, and a second return channel 6, all connected in sequence. The equalization tank 1 is located below the flotation device 2, and is connected to the flotation device 2 via an outlet pipe 11. A first water pump 12 is installed on the outlet pipe 11. Thus, under the action of the first water pump 12, the wastewater in the equalization tank 1 can be pumped into the flotation device 2.

[0026] The aforementioned wastewater treatment system also includes a transfer tank 7, through which the dissolved air flotation (DAF) device 2 is connected to the filter 3. In this embodiment, both the DAF device 2 and the filter 3 are located above the transfer tank 7, and the DAF device 2 is connected to the transfer tank 7 via an outlet channel 21. The transfer tank 7 is connected to the filter 3 via a water flow channel 71, on which a second water pump 72 is installed. Thus, the water treated by the DAF device 2 can be stored in the transfer tank 7, and the water in the transfer tank 7 is pumped to the filter 3 by the second water pump 72 for further treatment.

[0027] Filter 3 is an activated carbon filter or other type of filter. It should be noted that the working principle and structure of the equalization tank 1 and the air flotation device 2 are the same as those in existing technologies, and will not be described in detail in this embodiment.

[0028] Furthermore, the inlet of the first reflux channel 5 is connected to the filter 3, and the inlet of the second reflux channel 6 is connected to the air flotation device 2. Both the outlet of the second reflux channel 6 and the outlet of the first reflux channel 5 are connected to the equalization tank 1. A COD sensor 41 (chemical oxygen demand) is installed in the clear water tank 4. A first control valve 511 and a second control valve 61, electrically connected to the COD sensor 41, are respectively installed on the first reflux channel 5 and the second reflux channel 6. In other words, the first reflux channel 5 has a first control valve 511, and the second reflux channel 6 has a second control valve 61.

[0029] The first control valve 511 and the second control valve 61 are configured such that: when the value detected by the COD sensor 41 is greater than a threshold, the first control valve 511 opens the first reflux channel 5, and the second control valve 61 opens the second reflux channel 6; when the value detected by the COD sensor 41 is less than or equal to the threshold, both the first reflux channel 5 and the second reflux channel 6 are closed. That is, the first control valve 511 closes the first reflux channel 5, and the second control valve 61 closes the second reflux channel 6.

[0030] Understandably, after the wastewater enters the equalization tank 1, it is treated sequentially by the flotation device 2 and the filter 3 before entering the clear water tank 4. At this time, the first return channel 5 and the second return channel 6 are closed. When the COD sensor 41 detects abnormal data in the clear water tank 4, i.e., the value is greater than the threshold, the first control valve 511 opens the first return channel 5, and the second control valve 61 opens the second return channel 6. The water filtered by the filter 3 flows back to the equalization tank 1 through the first return channel 5, while the water treated by the flotation device 2 flows back to the equalization tank 1 through the second return channel 6, thus circulating the wastewater.

[0031] In this embodiment, the wastewater treatment system further includes a connecting channel 13 that communicates with the equalization tank 1. The outlets of the first return channel 5 and the second return channel 6 are both connected to the connecting channel 13. Thus, water enters the connecting channel 13 after passing through the first return channel 5 and the second return channel 6, and then flows back to the equalization tank 1 through the connecting channel 13.

[0032] Furthermore, the clear water tank 4 is located below the filter 3. The clear water tank 4 is connected to the first return channel 5 via a water pipe 73. Thus, water treated by the filter 3 can be transported to the clear water tank 4 through the water pipe 73. A third control valve 74 is installed on the aforementioned water pipe 73. The third control valve 74 is electrically connected to the signal output terminal of the COD sensor 41, and the third control valve 74 is configured to: open the water pipe 73 when the value detected by the COD sensor 41 is less than or equal to a threshold (i.e., the value is normal); and close the water pipe 73 when the value detected by the COD sensor 41 is greater than the threshold (i.e., the value is abnormal).

[0033] Furthermore, the first return channel 5 is provided with a connection port 512 that communicates with the inlet of the water pipe 73. Along the fluid flow path within the first return channel 5, the connection port 512 is located upstream of the first control valve 511. It can be understood that when the third control valve 74 is in the open state, the water filtered by the filter 3 flows into the clear water tank 4 through the water pipe 73. When the third control valve 74 is in the closed state, the water filtered by the filter 3 can flow back to the regulating tank 1 through the first return channel 5.

[0034] In this embodiment, the first return channel 5 includes a first channel 51 and a second channel 52 connected in sequence. The inlet of the first return channel 5 is located on the first channel 51, and the outlet of the first return channel 5 is located on the second channel 52. The first control valve 511 is located on the first channel 51, and the water pipe 73 is connected to the first channel 51.

[0035] To clean the filter 3, the wastewater treatment system also includes a backwash channel 31 and an inlet channel 42. The clear water tank 4 is connected to the filter 3 through the inlet channel 42, and the filter 3 is connected to the equalization tank 1 through the backwash channel 31. Thus, water flowing out of the clear water tank 4 can flow into the filter 3 through the inlet channel 42 to clean the inside of the filter 3, and the cleaned wastewater flows into the equalization tank 1 through the backwash channel 31.

[0036] In this embodiment, the backwash channel 31 is connected to the connection port that connects the first channel 51 and the second channel 52. Furthermore, the inlet of the backwash channel 31 is located below the inlet of the first channel 51. To control the backwash channel 31, a fourth control valve 32 is provided on the backwash channel 31 for opening and closing.

[0037] Under normal operating conditions, that is, when the data detected by the COD sensor 41 is normal, that is, when the value is less than or equal to the threshold, the wastewater is regulated in the equalization tank 1, and then pumped to the flotation device 2 by the first water pump 12. The water is treated by the flotation device 2. After being treated by the flotation device 2, the water is held in the transfer tank 7. Then, the water in the transfer tank 7 is pumped to the filter 3 by the second water pump 72 for filtration. The filtered water is transported to the clear water tank 4 through the water pipe 73 and held in the clear water tank 4.

[0038] Under abnormal operating conditions, that is, when the data detected by the COD sensor 41 is abnormal, i.e. the value is greater than the threshold, the first control valve 511 and the second control valve 61 are in the open state, while the third control valve 74 is in the closed state. After the sewage enters the flotation device 2 for treatment, part of the water enters the transfer tank 7 for retention. The water in the transfer tank 7 enters the filter 3 for filtration treatment and then flows back to the equalization tank 1 through the first return channel 5; the other part of the water flows back to the equalization tank 1 through the second return channel 6, and then the water quality is further treated.

[0039] It should be noted that the threshold should be selected based on actual needs.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A sewage treatment system comprising a conditioning tank (1), a flotation device (2), a filter (3) and a clean water tank (4) connected in series, characterized in that, The clear water tank (4) is provided with a COD sensor (41), and the sewage treatment system further comprises a first backflow channel (5) and a second backflow channel (6), the inlet of the first backflow channel (5) is communicated with the filter (3), the inlet of the second backflow channel (6) is communicated with the air flotation device (2), and the outlet of the second backflow channel (6) and the outlet of the first backflow channel (5) are both communicated with the adjusting tank (1), the first backflow channel (5) and the second backflow channel (6) are respectively provided with a first control valve (511) and a second control valve (61) which are electrically connected with the COD sensor (41), and the second control valve (61) and the first control valve (511) are configured to: when the value detected by the COD sensor (41) is greater than a threshold value, the first control valve (511) opens the first backflow channel (5), and the second control valve (61) opens the second backflow channel (6); when the value detected by the COD sensor (41) is less than or equal to the threshold value, the first backflow channel (5) and the second backflow channel (6) are both in a closed state.

2. The sewage treatment system of claim 1, wherein, The clear water tank (4) is communicated with the first backflow channel (5) through a water passing pipeline (73), the water passing pipeline (73) is provided with a third control valve (74), the third control valve (74) is electrically connected with the signal output end of the COD sensor (41), and the third control valve (74) is configured to: when the value detected by the COD sensor (41) is less than or equal to the threshold value, the water passing pipeline (73) is opened; and when the value detected by the COD sensor (41) is greater than the threshold value, the water passing pipeline (73) is closed.

3. The sewage treatment system of claim 2, wherein, The first backflow channel (5) is provided with a communication port (512) which is communicated with the inlet of the water passing pipeline (73), and the communication port (512) is located upstream of the first control valve (511) along the fluid flow path in the first backflow channel (5).

4. The sewage treatment system of claim 1, wherein, The sewage treatment system further comprises a backwashing channel (31) and an inflow channel (42), the clear water tank (4) is communicated with the filter (3) through the inflow channel (42), and the filter (3) is communicated with the adjusting tank (1) through the backwashing channel (31).

5. The sewage treatment system of claim 4, wherein, The backwashing channel (31) is provided with a fourth control valve (32) which opens and closes the backwashing channel (31).

6. The sewage treatment system of claim 5, wherein, The clear water tank (4) is located below the filter (3).

7. The sewage treatment system of claim 1, wherein, The sewage treatment system further comprises a connecting channel (13) which is communicated with the adjusting tank (1), and the outlet of the first backflow channel (5) and the outlet of the second backflow channel (6) are both communicated with the connecting channel (13).

8. The sewage treatment system of claim 1, wherein, The adjusting tank (1) is located below the air flotation device (2), and the adjusting tank (1) is communicated with the air flotation device (2) through a water outlet pipe (11), and the water outlet pipe (11) is provided with a first water pump (12).

9. The sewage treatment system of any one of claims 1 to 8, wherein, The sewage treatment system further comprises a transfer tank (7), and the air flotation device (2) is connected with the filter (3) through the transfer tank (7).

10. The sewage treatment system of claim 9, wherein, The air flotation device (2) and the filter (3) are both located above the transfer tank (7), the air flotation device (2) is connected with the transfer tank (7) through a water outlet channel (21), the transfer tank (7) is connected with the filter (3) through a water inlet channel (71), and a second water pump (72) is arranged on the water inlet channel (71).

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