Sewage treatment tank, sewage treatment device and sewage treatment method

Abstract

The embodiment of the present application provides a sewage treatment tank, a sewage treatment device and a sewage treatment method, which belongs to the technical field of sewage treatment. The sewage treatment tank includes a tank body, a first plate body, a first tube body and a biological disc. The tank body is provided with a water inlet, a drain and an air vent, and the air vent is higher than the water inlet and the drain; the first plate body divides the cavity into a first chamber and a second chamber, and the first plate body is provided with a plurality of first through holes, and the drain is connected to the first chamber; the first tube body is arranged in the second chamber and connected to the water inlet, and the first tube body is provided with a plurality of water distribution holes; the biological disc is arranged in the first chamber and higher than the drain. The embodiment of the present application reduces the floor space of the sewage treatment tank by vertically arranging the first plate body, the first tube body and the biological disc, achieves the aeration effect on the sewage, and reduces the cost of the sewage treatment equipment.

Description

Technical Field

[0001] The present application relates to sewage treatment technology, and in particular to a sewage treatment tank, a sewage treatment device and a sewage treatment method. Background Art

[0002] In the relevant technologies for sewage treatment, traditional sewage treatment equipment is mostly horizontal in structure, with multiple partitions and the need to configure a regulating tank, which requires high investment and occupies a large area. In addition, traditional integrated treatment equipment mostly uses aeration pumps for oxygenation to allow the sewage in the tank to fully contact with the oxygen in the air, providing sufficient oxygen for the subsequent sewage treatment microorganisms, thereby increasing the effect of microorganisms on sewage treatment. However, the energy consumption of aeration pumps for oxygenation is high, which leads to increased operating costs of sewage treatment equipment. Summary of the invention

[0003] The present application provides a sewage treatment tank, a sewage treatment device and a sewage treatment method, which are used to solve the technical problems of large footprint and high operating cost of existing sewage treatment equipment.

[0004] In a first aspect, the present application provides a sewage treatment tank, comprising a tank body, a first plate body, a first tube body and a biological disc, wherein the tank body is provided with a water inlet, a drain port and an air vent connected to a cavity inside the tank body, and the air vent is higher than the water inlet and the drain port; the first plate body is arranged in the cavity, and the first plate body divides the cavity into a first chamber and a second chamber higher than the first chamber, and the first plate body is evenly provided with a plurality of first through holes connecting the first chamber and the second chamber, and the drain port is connected to the first chamber; the first tube body is arranged in the second chamber and connected to the water inlet, and the first tube body is provided with a plurality of water distribution holes; the biological disc is arranged in the first chamber, and at least part of the biological disc is located directly below the first plate body, and the height of the biological disc is higher than the height of the drain port.

[0005] In a possible implementation, the sewage treatment tank further includes a rotating shaft and a driver for driving the rotating shaft to rotate, the driver is fixed to the tank body and connected to the rotating shaft, and the biological disc is fixedly connected to the rotating shaft.

[0006] In a possible implementation manner, a plurality of mesh structures are formed inside the bio-disc, and the bio-discs are multiple, and the multiple bio-discs are spaced apart and distributed along the vertical direction.

[0007] In a possible implementation, part of the rotating shaft is inserted into the second chamber, a first scraper fixed on the rotating shaft is disposed in the second chamber, and the first scraper is in contact with the upper surface of the first plate.

[0008] In a possible implementation manner, a first opening communicating with the second chamber is formed on a side wall of the tank body, and the first opening corresponds to the first scraper.

[0009] In a possible embodiment, a second plate body is also provided in the cavity, and the second plate body and the tank body together constitute a third chamber located above the second chamber, and a plurality of second through holes connecting the second chamber and the third chamber are evenly distributed on the second plate body, and the tank body is also provided with a return water port and a water outlet connected to the third chamber, and the water outlet is higher than the return water port, and the return water port is suitable for connecting with the drain port through a pumping device.

[0010] In a possible embodiment, the sewage treatment tank also includes a rotating shaft and a driver for driving the rotating shaft to rotate, the biological disc is fixedly connected to the rotating shaft, part of the rotating shaft is passed through the third chamber, a second scraper is arranged in the third chamber, and the second scraper is fixed to the rotating shaft.

[0011] In a second aspect, the present application provides a sewage treatment device, including a sewage treatment tank and a pumping device, wherein the pumping device is connected between a drain outlet and a return outlet of the sewage treatment tank.

[0012] In a possible embodiment, the pumping device includes a pump well, a water pump, a first connecting pipe and a second connecting pipe, the first connecting pipe connects the pump well and the drain outlet, the water inlet of the water pump is connected to the pump well, the water outlet of the water pump is connected to the return water outlet through the second connecting pipe, and the pump well is provided with a mud discharge valve; an electric valve is provided on the first connecting pipe, and a first liquid level switch and a second liquid level switch lower than the first liquid level switch are provided in the pump well, the first liquid level switch and the second liquid level switch are both connected to the electric signal of the electric valve, when the liquid level in the pump well rises and triggers the first liquid level switch, the electric valve is closed, and when the liquid level in the pump well drops and triggers the second liquid level switch, the electric valve is opened.

[0013] In a third aspect, the present application provides a sewage treatment method, using a sewage treatment tank or a sewage treatment device, wherein the water inlet of the sewage treatment tank is used to connect to a domestic sewage pipe, and the drain outlet of the sewage treatment tank is used to connect to a return water outlet of a tank body of the sewage treatment tank, so that the sewage circulates in the pipe body, and the sewage treatment method comprises the following steps:

[0014] Obtaining an initial water quality index M1 of the sewage entering the water inlet within a unit time period, wherein the water quality index is the proportion of organic matter content in the water quality;

[0015] According to the difference between the initial water quality index M1 and the preset target water quality index M0, the water quality improvement amount M2 is obtained;

[0016] Obtaining the sewage purification efficiency K of the biological disc in the sewage treatment tank, and calculating the target number of sewage circulation times N according to the sewage purification efficiency K and the water quality improvement amount M2;

[0017] The current circulation number n of the sewage is obtained. If n≥N, the return water flow rate of the return water port is made greater than the dripping water flow rate of the first plate body, so that the sewage can be discharged from the water outlet of the tank body.

[0018] The beneficial effects of the present invention are as follows: the sewage treatment tank, sewage treatment device and sewage treatment method provided by the present application, the cavity in the tank body of the sewage treatment tank can be ventilated with the outside through the vent, so that the cavity in the tank body can be exhausted or replenished through the vent. The sewage to be treated enters the first tube body through the water inlet, and after being dispersed through a plurality of water distribution holes distributed in the first tube body, it flows to the first plate body from different positions, and in the process of dripping to the first plate body, the dispersed sewage can have a larger contact area with the air in the second chamber, so that the sewage can be combined with more oxygen, and achieve an aeration effect in the second chamber, and the sewage dripping on the first plate body can be dispersed and dripped to the biological disc through the first through hole on the first plate body, and in the process of dripping to the biological disc, the dispersed sewage can have a larger contact area with the air in the first chamber, so as to achieve an aeration effect again in the first chamber, so that the sewage is combined with more oxygen, thereby creating good conditions for the biochemical reaction of microorganisms. When the sewage dripping on the bio-disc flows on the bio-disc, the organic matter in the sewage can undergo a biochemical reaction with the microorganisms loaded on the bio-disc, thereby achieving the effect of purifying the sewage. In addition, since the sewage drips on different positions of the bio-disc through the first through hole on the first plate body, the contact area with the microorganisms on the bio-disc can be increased, thereby improving the purification effect of the sewage. The sewage purified by the bio-disc can be discharged from the drain port. Multiple aeration is achieved by dripping sewage, and there is no need to set up an aeration tank and an aeration air pump, thereby reducing the operating cost. In addition, the first tube body is arranged in the second chamber, and the bio-disc is arranged in the first chamber. Therefore, the first tube body, the first plate body and the bio-disc are arranged in a vertical direction, thereby reducing the floor space of the sewage treatment tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] Figure 1 A schematic diagram of the structure of a sewage treatment device provided in an embodiment of the present application;

[0021] Figure 2 for Figure 1 A schematic structural diagram of the first plate body;

[0022] Figure 3 for Figure 1 A schematic structural diagram of the first tube body;

[0023] Figure 4 for Figure 1 Another structural schematic diagram of the first tube body.

[0024] Description of reference numerals:

[0025] 100-sewage treatment tank; 110-tank body; 111-water inlet; 112-drain outlet; 113-vent; 114-water return port; 115-water outlet; 116-first port; 117-second port; 120-cavity; 121-first chamber; 122-second chamber; 123-third chamber; 131-first plate; 131a-first through hole; 132-second plate; 141-first pipe; 141a-main pipe; 141b-branch pipe; 142-second pipe; 143-water distribution hole; 150-biodisc; 160-driver; 170-rotating shaft; 181-first scraper; 182-second scraper;

[0026] 200 - pumping device; 210 - water pump; 220 - pump well; 221 - mud discharge valve; 230 - first connecting pipe; 240 - second connecting pipe; 251 - first liquid level switch; 252 - second liquid level switch; 260 - electric valve.

[0027] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0029] The terms "first", "second", "third", "fourth", etc. (if any) in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein.

[0030] In the embodiments of the present application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplarily" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a specific way.

[0031] The sewage treatment devices in the prior art are mostly horizontal tanks with multiple partitions. The horizontal tanks cannot effectively utilize the vertical space, resulting in a large footprint of the sewage treatment device. In addition, the supporting equipment of the sewage treatment device with a horizontal tank needs to be equipped with an aeration tank and an aeration pump to aerate the sewage, resulting in a large number of sewage treatment equipment, complex control, and high operating costs.

[0032] The sewage treatment tank, sewage treatment device and sewage treatment method provided in this application are intended to solve the above technical problems of the prior art.

[0033] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0034] like Figures 1 to 4 As shown, the present application provides a sewage treatment tank 100 in the first aspect, and the sewage treatment tank 100 includes a tank body 110, a first plate body 131, a first tube body 141 and a biological disc 150. The tank body 110 of the sewage treatment tank 100 has a cavity 120 inside, and the tank body 110 is provided with a water inlet 111, a drain port 112 and a vent 113 connected to the internal cavity 120, and the vent 113 is higher than the water inlet 111 and the drain port 112. The first plate body 131 is arranged in the cavity 120, and the first plate body 131 divides the cavity 120 into a first chamber 121 and a second chamber 122 higher than the first chamber 121, and the first plate body 131 is evenly distributed with a plurality of first through holes 131a connecting the first chamber 121 and the second chamber 122. The first tube body 141 is disposed in the second chamber 122 and communicated with the water inlet 111. The first tube body 141 is provided with a plurality of water distribution holes 143. The bio-disc 150 is disposed in the first chamber 121. At least part of the bio-disc 150 is located below the first plate body 131. The height of the bio-disc 150 is higher than the height of the drain port 112.

[0035] Through the above technical solution, the cavity 120 in the tank body 110 can be ventilated with the outside through the vent 113, so that the cavity 120 in the tank body 110 can be exhausted or replenished with air through the vent 113. The sewage to be treated enters the first tube body 141 through the water inlet 111, and after being dispersed through a plurality of water distribution holes 143 distributed in the first tube body 141, it flows to the first plate body 131 from different positions, and in the process of dripping to the first plate body 131, the dispersed sewage can have a larger contact area with the air in the second chamber 122, so that the sewage can combine with more oxygen, and achieve a primary aeration effect in the second chamber 122.

[0036] The sewage dripping on the first plate 131 can be dispersed and dripped downward into the first chamber 121 through the first through holes 131a on the first plate 131. The bio-disc 150 located in the first chamber 121 can receive the sewage dripping from the first plate 131. In the process of the sewage dripping onto the bio-disc 150, the dispersed sewage can have a larger contact area with the air in the first chamber 121, so that an aeration effect is achieved again in the first chamber 121, so that the sewage is combined with more oxygen, thereby creating good conditions for the biochemical reaction of microorganisms.

[0037] When the sewage dripping on the bio-disc 150 flows on the bio-disc 150, the organic matter in the sewage can undergo a biochemical reaction with the microorganisms loaded on the bio-disc 150, thereby achieving the effect of purifying the sewage. In addition, since the sewage drips on different positions of the bio-disc 150 through the first through holes 131a on the first plate 131, the contact area with the microorganisms on the bio-disc 150 can be increased, thereby improving the purification effect of the sewage. The sewage purified by the bio-disc 150 can be discharged from the drain port 112.

[0038] The sewage can achieve oxygenation effect by dripping between the first tube body 141 and the first plate body 131 and between the first plate body 131 and the biological disc 150, without the need to set up an aeration tank and an aeration air pump, thereby reducing the number of equipment in the sewage treatment device and reducing the operating cost. In addition, the first tube body 141 is arranged in the second chamber 122, and the biological disc 150 is arranged in the first chamber 121. Therefore, the first tube body 141, the first plate body 131 and the biological disc 150 are arranged in a vertical direction, and the entire tank body 110 is arranged vertically, which effectively utilizes the vertical space, reduces the floor area of ​​the sewage treatment tank 100, and simultaneously achieves the effect of multi-stage treatment.

[0039] It should be noted that the water inlet 111 can be connected to a rural domestic sewage pipeline.

[0040] The tank body 110 may be made of materials such as concrete, high-density polyethylene (HDPE), fiberglass, etc., and the present application does not impose any specific limitation on this, as long as the strength of the tank body 110 can meet the use requirements.

[0041] Optionally, the projections of all the first through holes 131a on the first plate 131 along the vertical direction are located inside the bio-disc 150, so that the sewage dripping from the first through holes 131a can drip onto the bio-disc 150, thereby improving the sewage purification effect.

[0042] like Figure 3 As shown, the first pipe body 141 may include a main pipe 141a and strip-shaped branch pipes 141b symmetrically distributed and connected to both sides of the main pipe 141a, and each branch pipe 141b is provided with water distribution holes 143 with equal spacing. One end of the main pipe 141a is connected to the water inlet 111, and the other end is closed, so that the sewage entering the water inlet 111 is dispersed through multiple branch pipes 141b and then flows out from different water distribution holes 143. Of course, in other embodiments, the structure of the first pipe body 141 may also be as follows: Figure 4 As shown, it includes a main pipe 141a and a plurality of annular branch pipes 141b coaxially connected to the main pipe 141a, each annular branch pipe 141b is provided with water distribution holes 143 with equal spacing, and the spacing between two adjacent annular branch pipes 141b is also equal. One end of the main pipe 141a is connected to the water inlet 111, and the other end is closed, so that sewage can also flow out through different water distribution holes 143.

[0043] like Figure 2 As shown, the material of the first plate 131 can be stainless steel or polyethylene (PE) plate, etc., so that the first plate 131 has good corrosion resistance. The first through hole 131a on the first plate 131 can be obtained by rotating the hole, and the aperture of the first through hole 131a can be 1~3mm. On the one hand, the first through hole 131a can be convenient for the liquid in the sewage to flow, and on the other hand, the smaller aperture of the first through hole 131a can also prevent the large volume of sludge contained in the sewage from flowing into the first through hole 131a and entering the biological disc 150. The fixing methods between the first plate 131 and the tank body 110 include but are not limited to clamping, integral molding, and bolt connection.

[0044] like Figure 1As shown, the surface of the bio-disc 150 (i.e., the upper surface of the bio-disc) can be parallel to the horizontal plane in the horizontal direction, or can have a certain angle with the horizontal plane, i.e., the surface of the bio-disc 150 is inclined relative to the horizontal plane. When the surface of the bio-disc 150 is parallel to the horizontal plane, the residence time of the sewage on the bio-disc 150 can be increased, thereby improving the purification effect of the sewage.

[0045] In view of the fact that the contact amount between sewage and the microorganisms on the biological disc 150 is positively correlated with the sewage purification effect, a plurality of mesh structures are formed inside the biological disc 150. The mesh structure can increase the number of channels inside the biological disc 150, divert the sewage, and improve the flowability of the sewage. At the same time, the mesh structure can also increase the load of microorganisms. The diverted sewage undergoes biochemical reactions with more microorganisms, thereby improving the sewage purification effect. For example, the structure of the biological disc 150 can adopt the structure of a loofah to form a plurality of mesh structures inside the biological disc 150 to ensure a higher bioload and flowability.

[0046] In addition, multiple biological discs 150 can be provided, and the multiple biological discs 150 are spaced apart in the vertical direction, so that the sewage can drip on different biological discs 150 one by one during the dripping process from top to bottom, thereby achieving multiple purifications, and also playing the role of multi-stage treatment, thereby improving the purification effect of sewage. Moreover, when the sewage drips between two adjacent biological discs 150, it will contact with the air in the tank 110 again for oxygenation.

[0047] Optionally, along the vertical direction, the distance between two adjacent bio-discs 150 may be 30-50 cm. Within this distance range, effective oxygenation is ensured, and sufficient bio-discs 150 are ensured in the tank 110 to provide sufficient biomass.

[0048] like Figure 1 As shown, in order to allow the dripping sewage to have a larger contact area with the biological disc 150, in some optional embodiments, the sewage treatment tank 100 also includes a rotating shaft 170 and a driver 160 for driving the rotating shaft 170 to rotate, the driver 160 is fixed to the tank body 110 and connected to the rotating shaft 170, and the biological disc 150 is fixedly connected to the rotating shaft 170.

[0049] After the drive 160 drives the rotating shaft 170 to rotate, the bio-disc 150 can rotate along with the rotating shaft 170, so that different positions of the bio-disc 150 can be located directly below the first plate 131, and the dripping sewage can drip on different positions of the bio-disc 150, thereby improving the sewage purification efficiency of the microorganisms on the bio-disc 150. The rotating shaft 170 rotates at a uniform speed, so that the bio-disc 150 can be in uniform contact with the dripping sewage. In addition, the continuous rotation of the bio-disc 150 can prevent the partial penetration of the bio-disc 150 caused by the sewage dripping on the same position of the bio-disc 150 for a long time.

[0050] It should be noted that the driver 160 can be a servo motor, a stepper motor, etc.

[0051] Optionally, the shaft 170 can be arranged in a vertical direction, and the surface of the bio-disc 150 is perpendicular to the axis of the shaft 170, so that the bio-disc 150 can rotate in a horizontal plane. The shaft 170 can be fixed through the center of the bio-disc 150 to reduce the space required for the bio-disc 150 to rotate.

[0052] The sewage entering from the water inlet 111 may contain sludge. In order to prevent the sludge from accumulating on the upper surface of the first plate 131 for a long time and causing the first through hole 131a to be blocked, Figure 1 As shown, in some optional embodiments, part of the rotating shaft 170 is disposed in the second chamber 122 , and a first scraper 181 fixed on the rotating shaft 170 is disposed in the second chamber 122 , and the first scraper 181 is in contact with the upper surface of the first plate 131 .

[0053] During the rotation of the rotating shaft 170, the first scraper 181 can be driven to rotate, so that the first scraper 181 scrapes off the sludge accumulated on the upper surface of the first plate body 131. At the same time, during the rotation of the first scraper 181, the sludge moves to the edge of the first plate body 131 under the action of centrifugal force to expose the blocked first through hole 131a. In addition, during the rotation of the first scraper 181, the first scraper 181 can also drive the sewage to move, so that the sewage reaches different first through holes 131a, which is conducive to more uniform water distribution.

[0054] It should be noted that the sludge that is cleaned and accumulated on the edge of the first plate body 131 can be manually removed from the sewage treatment tank 100 regularly.

[0055] In order to reduce the inconvenience of manually removing the accumulated sludge, such as Figure 1As shown, in some optional embodiments, the side wall of the tank body 110 is provided with a first opening 116 connected to the second chamber 122, and the first opening 116 corresponds to the first scraper 181. When the first opening 116 is opened, the sludge cleaned by the first scraper 181 can enter the first opening 116 under the action of centrifugal force, thereby realizing automatic discharge of the sludge outside the tank body 110.

[0056] Optionally, the lower edge of the first opening 116 is at the same level as the upper surface of the first scraper 181 , so that the sludge can enter the first opening 116 more easily.

[0057] In order to improve the evolution effect on sewage, such as Figure 1 As shown, in some optional embodiments, a second plate body 132 is further provided in the cavity 120, and the second plate body 132 and the tank body 110 together constitute a third chamber 123 located above the second chamber 122, and a plurality of second through holes connecting the second chamber 122 and the third chamber 123 are evenly distributed on the second plate body 132, and the tank body 110 is also provided with a return water port 114 and a water outlet 115 connected to the third chamber 123, and the water outlet 115 is higher than the return water port 114, and the return water port 114 is suitable for connecting with the drain port 112 through the pumping device 200.

[0058] The pumping device 200 can transport the purified water discharged from the drain port 112 to the return port 114, and after entering the third chamber 123 from the return port 114, the water is dispersed through the second through hole on the second plate 132 and drips into the second chamber 122, and then enters the first chamber 121 from the second chamber 122, and is purified again by the biological disc 150 in the first chamber 121 to improve the purification effect of the sewage. The pumping device 200 can continuously or periodically transport the water purified by the biological disc 150 to the return port 114, so as to circulate multiple times in the sewage treatment tank 100 to achieve multiple purifications. And the number of times the sewage needs to be repeatedly purified can be selectively implemented according to the initial water quality index of the sewage transported from the water inlet 111. The smaller the difference between the initial water quality index of the sewage and the target water quality index, the fewer times the purification needs to be repeated, and the greater the difference between the initial water quality index of the sewage and the target water quality index, the more times the purification needs to be repeated. The water quality index of sewage can use the content ratio of a certain organic matter in the water as the parameter value of the index. The more the organic matter content, the higher the value of the water quality index; conversely, the lower the organic matter content, the lower the value of the water quality index. The content ratio of organic matter can be measured by online instruments, such as online COD meters or ammonia nitrogen meters.

[0059] In some optional implementations, a first water quality detector may be provided at the water inlet 111 to obtain initial water quality indicators.

[0060] In addition, it should be noted that the pumping flow rate of the pumping device 200 can be designed to be adjustable, so as to control the flow rate (hereinafter referred to as the return flow rate) of the sewage entering the tank body 110 from the return port 114. Since the number and size of the second through holes on the second plate body 132 are fixed, the upper limit of the drip flow rate when the sewage flows from the second plate body 132 to the second chamber 122 is fixed. When the purified water quality meets the purification requirements and needs to be discharged from the sewage treatment tank 100 for other uses, the return flow rate can be adjusted to be greater than the upper limit of the drip flow rate of the second plate body 132, so that the purified water will gradually accumulate in the third chamber 123 to gradually increase the water level. When the water level rises to the height of the water outlet 115, the purified water can flow out from the water outlet 115. When the purified water quality needs to be purified again, the return flow rate can be adjusted to be less than the upper limit of the flow rate of the second plate body 132, so that the water level in the third chamber 123 reaches the height of the water outlet 115.

[0061] In order to determine whether the water quality of the water discharged from the water outlet 115 meets the discharge standard (i.e., the preset water quality index), a second water quality detector can also be set in the third chamber 123, and the height of the second water quality detector is lower than the water outlet 115. In this way, when the water level in the third chamber 123 rises to the height of the second water quality detector, the water quality detection of the water that the second water quality detector can contact. If it is detected that the water quality index reaches the preset water quality index, the flow of the pumping device 200 is not adjusted so that the water that meets the standard can be discharged from the water outlet 115. If it is detected that the water quality index does not reach the preset water quality index, the pumping device 200 can be controlled by the controller to reduce the flow rate to prevent the water that does not meet the standard from being discharged from the water outlet 115. Afterwards, the liquid level of the third chamber 123 can be raised again after a period of time and tested again by the second water quality detector.

[0062] Optionally, a second water quality detector may be disposed at the water return port 114 .

[0063] The size, number and arrangement of the second through holes on the second plate body 132 can be the same as the size, number and arrangement of the first through holes 131a on the first plate body 131, and the material of the second plate body 132 can also be the same as the material of the first plate body 131, so that the first plate body 131 and the second plate body 132 can share the same spare parts, reducing the number of spare parts and making it more convenient to replace the first plate body 131 or the second plate body 132.

[0064] Optionally, a second tube body 142 is further provided in the third chamber 123, the second tube body 142 is connected to the water return port 114, and a plurality of water distribution holes 143 are provided on the second tube body 142. By providing the second tube body 142, the sewage entering the water return port 114 can be dispersed through the water distribution holes 143 on the second tube body 142, which is beneficial to improving the oxygenation effect of the sewage in the third chamber 123.

[0065] It should be noted that the structure of the second tube body 142 can be the same as that of the first tube body 141, so that the first tube body 141 and the second tube body 142 can share the same spare part. Of course, the structure of the second tube body 142 can also be different from that of the first tube body 141. For example, the first tube body 141 adopts Figure 3 The structure shown in FIG. 1 is as follows: the second tube body 142 is Figure 4 The structure shown is not specifically limited in this application.

[0066] In order to prevent sludge from accumulating on the upper surface of the second plate body 132, as shown in FIG. Figure 1 As shown, in some optional embodiments, the sewage treatment tank 100 also includes a rotating shaft 170 and a driver 160 for driving the rotating shaft 170 to rotate, the biological disc 150 is fixedly connected to the rotating shaft 170, a portion of the rotating shaft 170 is passed through the third chamber 123, and a second scraper 182 is provided in the third chamber 123, and the second scraper 182 is fixed to the rotating shaft 170.

[0067] The rotation of the shaft 170 drives the biological disc 150 to rotate, and can also drive the second scraper 182 to rotate, so as to clean the upper surface of the second plate body 132. If necessary, a second opening 117 can be opened on the side wall of the tank body 110, and the second opening 117 corresponds to the second scraper 182. When the second opening 117 is opened, the sludge cleaned by the second scraper 182 can be discharged to the outside of the tank body 110 through the second opening 117.

[0068] Optionally, the lower edge of the second opening 117 is at the same level as the upper surface of the second scraper 182 , so that the sludge can enter the second opening 117 more easily.

[0069] Based on the above-mentioned sewage treatment tank 100 , the present application provides a sewage treatment device in a second aspect. The sewage treatment device includes the sewage treatment tank 100 and a pumping device 200 . The pumping device 200 is connected between the drain port 112 and the return port 114 of the sewage treatment tank 100 .

[0070] It can be understood that the sewage treatment tank 100 has the beneficial effects of the above-mentioned sewage treatment tank 100. The pumping device 200 can transport the water discharged from the drain port 112 to the return water port 114 to achieve multiple circulation purification of the sewage.

[0071] Regarding the specific structure of the pumping device 200, in some optional embodiments, the pumping device 200 includes a pump well 220, a water pump 210, a first connecting pipe 230 and a second connecting pipe 240, the first connecting pipe 230 connects the pump well 220 and the drain outlet 112, the water inlet 111 of the water pump 210 is connected to the pump well 220, the water outlet 115 of the water pump 210 is connected to the return water outlet 114 through the second connecting pipe 240, and the pump well 220 is provided with a mud discharge valve 221.

[0072] The mud discharge valve 221 is a normally closed valve. The purified water in the tank body 110 can flow into the pump well 220 through the first connecting pipe 230 and settle in the pump well 220, so that the mud in the water sinks to the bottom of the pump well 220. When the mud accumulated in the pump well 220 needs to be cleaned regularly, the mud discharge valve 221 can be opened to discharge the mud. The water pump 210 can deliver the water in the pump well 220 to the return water port 114.

[0073] In some optional embodiments, an electric valve 260 is provided on the first connecting pipe 230, and a first liquid level switch 251 and a second liquid level switch 252 lower than the first liquid level switch 251 are provided in the pump well 220. The first liquid level switch 251 and the second liquid level switch 252 are both electrically connected to the electric valve 260 by signals. When the liquid level in the pump well 220 rises and triggers the first liquid level switch 251, the electric valve 260 is closed. When the liquid level in the pump well 220 drops and triggers the second liquid level switch 252, the electric valve 260 is opened and the water pump 210 is closed.

[0074] By controlling the closing of the electric valve 260 through the first liquid level switch 251, it is possible to prevent the water level in the pump well 220 from being too high and overflowing from the top of the pump well 220. The second liquid level switch 252 controls the opening of the electric valve 260 to prevent the water level in the pump well 220 from being too low and causing the water pump 210. The cooperation of the first liquid level switch 251, the second liquid level switch 252 and the electric valve 260, on the one hand, can keep the liquid level height in the pump well 220 between the height of the first liquid level switch 251 and the height of the second liquid level switch 252, so that the water pump 210 can always maintain efficient operation and the flow rate of the water pump 210 can remain stable. On the other hand, it also enables the installation height of the pump well 220 to be much lower than the height of the tank body 110. For example, the main body of the pump well 220 can be set below the ground, and the sewage treatment tank 100 can be set on the ground. On the third hand, the second liquid level switch 252 can also prevent the cavitation of the water pump 210 and increase the service life of the water pump 210.

[0075] Optionally, the first liquid level switch 251 and the second liquid level switch 252 may be a float type liquid level switch, in which a float floats on the water surface, and changes in the liquid level surface will cause the height of the float to change, thereby turning on or off a micro switch connected to the float. In other embodiments, the first liquid level switch 251 and the second liquid level switch 252 may also be an electronic liquid level switch, and the water level is detected by an electronic probe built into the electronic liquid level switch.

[0076] In some optional embodiments, the second liquid level switch 252 can also be connected to the water pump 210 via an electrical signal so that the second liquid level switch 252 can control the shutdown of the water pump 210. When the liquid level in the pump well 220 drops below the trigger height of the second liquid level switch 252, the water pump 210 is shut down to avoid the liquid level being too low, resulting in insufficient water pumping by the water pump 210 and affecting the service life of the water pump 210.

[0077] It can be understood that the entire sewage treatment device can be controlled by a controller, and the controller can be electrically connected to the water pump 210, the first liquid level switch 251, the second liquid level switch 252 and the electric valve 260 in the pumping device 200. The water flow rate of the water pump 210 is controlled by the controller, and the controller can also control the opening / closing of the electric valve 260 after receiving the signals of the first liquid level switch 251 and the second liquid level switch 252. The rotation of the controller includes but is not limited to a single chip microcomputer or a central processing unit.

[0078] The water flow rate adjustment and start / stop of the water pump 210 can be controlled by the controller, and the opening or closing of the electric valve 260 can also be controlled by the controller.

[0079] Based on the above-mentioned sewage treatment tank or sewage treatment device, the present application provides a sewage treatment method in a third aspect, the sewage treatment method adopts the above-mentioned sewage treatment tank or sewage treatment device, wherein the drain port 112 of the sewage treatment tank is used to be connected to the return water port 114 of the tank body 110 of the sewage treatment tank, so that the sewage circulates in the tank body 110, and the sewage treatment method comprises the following steps:

[0080] Obtaining an initial water quality index M1 of the sewage entering the water inlet 111 within a unit time period, where the water quality index is the proportion of organic matter content in the water quality;

[0081] According to the difference between the initial water quality index M1 and the preset target water quality index M0, the water quality improvement amount M2 is obtained;

[0082] Obtaining the sewage purification efficiency K of the biological disc 150 in the sewage treatment tank, and calculating the target number of sewage circulation times N according to the sewage purification efficiency K and the water quality improvement amount M2;

[0083] The current circulation number n of the sewage is obtained. If n≥N, the return water flow rate of the return water port 114 is made greater than the dripping water flow rate of the first plate body 131 so that the sewage can be discharged from the water outlet 115 of the tank body 110 .

[0084] It can be understood that the time periods for the generation of domestic sewage in rural areas are mainly concentrated in the morning, noon and evening cooking time periods. For example, the morning cooking time period is usually concentrated in 6-8 o'clock, the noon cooking time period is usually concentrated in 11-13 o'clock, and the afternoon cooking time period is usually concentrated in 17-19 o'clock. The total amount of domestic sewage generated in these three time periods is large and the water quality fluctuates greatly, while the amount of domestic sewage generated in the remaining time periods is small, and the overall impact on the water quality in the sewage treatment tank 100 is also small. Therefore, the above-mentioned unit time period can select any time period of the morning cooking time period, the noon cooking time period or the afternoon cooking time period.

[0085] Between the above-mentioned unit time periods, the return water flow rate of the return water port 114 can be pre-set to be smaller than the dripping flow rate of the second plate body 132, so that all the water provided by the return water port 114 to the third chamber 123 can drip downward through the second through hole on the second plate body 132, and will not accumulate in the third chamber 123, causing the liquid level in the third chamber 123 to rise to the water outlet 115, thereby preventing sewage that does not meet the target water quality index M0 from being discharged from the water outlet 115.

[0086] The preset target water quality index M0 is the water quality index required to be achieved after sewage purification. Water below the water quality index meets the purification requirements and can be discharged from the water outlet 115. The water quality index of sewage can be detected by an online monitoring instrument, such as an online COD meter or an ammonia nitrogen meter. The detection instrument for detecting the initial water quality index can be set at the water inlet 111, that is, the water inlet 111 is provided with a first water quality detector.

[0087] The sewage purification efficiency K is the change in the water quality index of the sewage after the sewage has been circulated once in the treatment device. The sewage purification efficiency K can be obtained through multiple experiments, that is, by providing a certain amount of sewage to the water inlet 111, and measuring the change in the water quality index of the sewage after the sewage has been circulated once. This change is the sewage purification efficiency K. A complete cycle of sewage can be measured by measuring the amount of sewage provided to the water inlet 111 and the amount of sewage entering the return water port 114. When the amount of sewage provided to the water inlet 111 is equal to the amount of sewage entering the return water port 114, it can be considered that the sewage has completed a cycle in the sewage treatment device. The amount of sewage introduced into the water inlet 111 can be measured by a first flow meter set at the water inlet 111, and the amount of sewage entering the return water port 114 can be measured by a second flow meter set at the return water port 114.

[0088] By obtaining the initial water quality index M1 and the sewage purification efficiency K, according to N=M2 / K, the target circulation number N of the sewage can be calculated, and then the sewage can be continuously pumped from the drain port 112 to the return port 114 through the pumping device 200 to realize the circulation of the sewage. When the current circulation number n of the sewage reaches the target circulation number N, the water outlet flow rate of the pumping device 200 can be increased, so that the return water flow rate of the return port 114 is greater than the dripping flow rate of the first plate body 131, so that the purified sewage is continuously accumulated above the first plate body 131, and the water level is continuously rising until it is discharged from the water outlet 115 of the tank body.

[0089] The entire circulation of the pumping device 200 can be controlled by a controller, which is electrically connected to the pumping device 200, the first flow meter and the second flow meter. The controller can control the water flow rate of the pumping device 200 and calculate the current circulation number n of the sewage in the sewage treatment system.

[0090] It should be noted that the above-mentioned initial water quality index can be the highest value of the water quality index within a unit time period, or it can be the average value of the water quality index. In addition, when the second plate 132 is provided in the tank 110, when n≥N, the return water flow rate of the return water port 114 can also be made greater than the dripping water flow rate of the second plate 132, so that the probability of the purified sewage being re-contaminated during the discharge from the water outlet 115 can be reduced.

[0091] In some optional embodiments, a second water quality detector is further provided in the third chamber 123, and the second water quality detector is used to detect whether the water quality index of the sewage after the above n cycles reaches the preset water quality index.

[0092] It can be understood that after measurement and experiment, the total amount of sewage that needs to be treated by the sewage treatment device every day can be obtained in advance, and the capacity of the tank body 110 can be set to be greater than the total amount of sewage.

[0093] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application.

[0094] It should be understood that the present application is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A sewage treatment tank, characterized in that: include: The tank body (110) is provided with a water inlet (111), a water outlet (112) and a vent (113) which are in communication with the cavity (120) inside the tank body (110), wherein the vent (113) is higher than the water inlet (111) and the water outlet (112); A first plate body (131) is arranged in the cavity (120), the first plate body (131) divides the cavity (120) into a first chamber (121) and a second chamber (122) higher than the first chamber (121), a plurality of first through holes (131a) connecting the first chamber (121) and the second chamber (122) are evenly distributed on the first plate body (131), and the drainage port (112) is connected to the first chamber (121); A first tube body (141) is disposed in the second chamber (122) and is in communication with the water inlet (111); the first tube body (141) is provided with a plurality of water distribution holes (143); A biological disc (150) is disposed in the first chamber (121), at least a portion of the biological disc (150) is located below the first plate (131), the height of the biological disc (150) is higher than the height of the drain port (112), a plurality of mesh structures are formed inside the biological disc (150), there are a plurality of biological discs (150), and the plurality of biological discs (150) are spaced apart in a vertical direction; A rotating shaft (170) and a driver (160) for driving the rotating shaft (170) to rotate, wherein the driver (160) is fixed on the tank body (110) and connected to the rotating shaft (170), and the biological disc (150) is fixedly connected to the rotating shaft (170); a portion of the rotating shaft (170) is inserted into the second chamber (122), a first scraper (181) fixed to the rotating shaft (170) is arranged in the second chamber (122), and the first scraper (181) is in contact with the upper surface of the first plate body (131); a second plate body (132) is also arranged in the cavity (120), and the second plate body (132) and the tank body (110) together form a third chamber (123) located above the second chamber (122), and a plurality of second through holes connecting the second chamber (122) and the third chamber (123) are evenly distributed on the second plate body (132); The tank body (110) is further provided with a water return port (114) and a water outlet (115) which are in communication with the third chamber (123); the water outlet (115) is higher than the water return port (114); and the water return port (114) is in communication with the water outlet (112) via a pumping device (200).

2. The sewage treatment tank according to claim 1, characterized in that: The side wall of the tank body (110) is provided with a first opening (116) communicating with the second chamber (122), and the first opening (116) corresponds to the first scraper (181).

3. The sewage treatment tank according to claim 2, characterized in that: A portion of the rotating shaft (170) is inserted into the third chamber (123), a second scraper (182) is arranged in the third chamber (123), and the second scraper (182) is fixed on the rotating shaft (170).

4. A sewage treatment device, characterized in that: It comprises a sewage treatment tank (100) and a pumping device (200) as claimed in any one of claims 1 to 3, wherein the pumping device (200) is connected between a water outlet (112) and a water return outlet (114) of the sewage treatment tank (100).

5. The sewage treatment device according to claim 4, characterized in that: The pumping device (200) comprises a pump well (220), a water pump (210), a first connecting pipe (230) and a second connecting pipe (240); the first connecting pipe (230) connects the pump well (220) and the water outlet (112); the water inlet (111) of the water pump (210) is connected to the pump well (220); the water outlet (115) of the water pump (210) is connected to the water return port (114) via the second connecting pipe (240); and the pump well (220) is provided with a mud discharge valve (221); The first connecting pipe (230) is provided with an electric valve (260), and the pump well (220) is provided with a first liquid level switch (251) and a second liquid level switch (252) lower than the first liquid level switch (251). The first liquid level switch (251) and the second liquid level switch (252) are both connected to the electric valve (260) by electrical signals. When the liquid level in the pump well (220) rises and triggers the first liquid level switch (251), the electric valve (260) is closed; when the liquid level in the pump well (220) drops and triggers the second liquid level switch (252), the electric valve (260) is opened.

6. A sewage treatment method, using the sewage treatment tank according to any one of claims 1 to 3 or the sewage treatment device according to claim 4 or 5, characterized in that: The water inlet (111) of the sewage treatment tank is used to connect to a domestic sewage pipe, and the drain outlet (112) of the sewage treatment tank is used to connect to a water return port (114) of a tank body (110) of the sewage treatment tank, so that sewage circulates in the tank body (110). The sewage treatment method comprises the following steps: Obtaining an initial water quality index M1 of the sewage entering the water inlet (111) within a unit time period, wherein the water quality index is the proportion of organic matter content in the water quality; According to the difference between the initial water quality index M1 and the preset target water quality index M0, the water quality improvement amount M2 is obtained; Obtaining the sewage purification efficiency K of the biological disc (150) in the sewage treatment tank, and calculating the target number of sewage circulation times N according to the sewage purification efficiency K and the water quality improvement amount M2; The current circulation number n of the sewage is obtained, and if n≥N, the return water flow rate of the return water port (114) is made greater than the dripping water flow rate of the first plate body (131), so that the sewage can be discharged from the water outlet (115) of the tank body (110).

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