Sewage filtering and taking system with automatic backwashing function

Abstract

The utility model discloses a sewage filtering and taking system with an automatic backwashing function, which comprises a sewage pool, a lifting pump, a filter, a reservoir and a floating ball type liquid level switch, the water inlet end of the lifting pump is communicated with the sewage pool, and the water outlet end of the lifting pump is communicated with the water inlet of the filter through a water taking pipe; a water outlet of the filter is connected into the water storage tank through a water conveying pipe, the tail end of the water conveying pipe is located at the second liquid level height of the water storage tank, the elevation of the second liquid level is higher than that of the sewage tank, and the floating ball type liquid level switch is arranged in the water storage tank, connected with the lifting pump and capable of controlling starting and stopping of the lifting pump. According to the utility model, the reservoir is additionally arranged, and the water level elevations of the reservoir and the sewage pool are optimally designed, so that after water enters the reservoir, part of water in the reservoir flows back to the filter under the siphoning action, and the filtering assembly of the filter is automatically backwashed, thereby ensuring the smooth proceeding of a sewage test; and the purposes of reducing cost and increasing efficiency are achieved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a wastewater filtration and water intake system with automatic backwashing function. Background Technology

[0002] Before implementing a wastewater treatment project, it is usually necessary to conduct tests using wastewater test devices or small-scale wastewater treatment systems to verify and optimize the process flow and parameters. However, municipal wastewater contains large particulate impurities such as sawdust, waste paper, hair, and sand. During the operation of wastewater test devices or small-scale wastewater treatment systems, water treatment equipment such as pipes and pumps are prone to clogging, requiring considerable effort for maintenance. Moreover, since the project is in the experimental stage, wastewater pretreatment processes (coarse screens, fine screens, bar screen cleaners, etc.) have not yet been put into use. Therefore, during the experiment, small filters are often used for wastewater pretreatment to initially remove large particulate impurities from the wastewater to avoid adverse effects on the equipment involved in the experimental stage.

[0003] Compared to large-scale equipment in water plants, small-scale water treatment equipment involves pumps and pipes of smaller specifications, making them more susceptible to clogging by impurities in the water, leading to operational failures and more complex maintenance processes. This significantly impacts the normal conduct of wastewater testing. Therefore, how to economically and effectively solve the clogging problem of small-scale water treatment devices or small-scale wastewater treatment systems to ensure their normal operation has become a crucial technical issue that must be addressed for efficient and smooth wastewater testing. Utility Model Content

[0004] The purpose of this invention is to propose a wastewater filtration and water intake system with automatic backwashing function to solve the technical problems described in the background art.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0006] A wastewater filtration and water intake system with automatic backwashing function includes a wastewater tank, a lift pump, a filter, a storage tank, and a float-type level switch. The inlet of the lift pump is connected to the wastewater tank, and the outlet of the lift pump is connected to the inlet of the filter via a water intake pipe. The outlet of the filter is connected to the storage tank via a water delivery pipe. The end of the water delivery pipe is located at the second liquid level height of the storage tank, and the elevation of the second liquid level is higher than the liquid level elevation of the wastewater tank. The float-type level switch is installed in the storage tank and connected to the lift pump, and can... The system controls the start and stop of the booster pump. When the liquid level in the reservoir is at the first liquid level, which is higher than the second liquid level, the float-type liquid level switch opens, the booster pump stops working, water intake stops, and the liquid in the reservoir flows back through the water pipe to the filter for backwashing. When the liquid level in the reservoir is lower than the second liquid level, the end of the water pipe separates from the water surface, and backwashing stops. When the liquid level in the reservoir is at the third liquid level, which is lower than the second liquid level, the float-type liquid level switch closes, the booster pump starts, and pumps the liquid in the sewage tank to the reservoir.

[0007] Preferably, the filter is provided with a drain valve at the bottom.

[0008] Preferably, the water supply pipe is equipped with a siphon failure valve.

[0009] Preferably, the water supply pipe is also equipped with an electromagnetic flow meter.

[0010] Preferably, the elevation of the second liquid level at the end of the water supply pipe is adjustable.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: By adding a water storage tank and optimizing the water surface elevation of the water storage tank and the sewage tank, after the water storage tank is filled with water, the siphon effect is used to make part of the water in the water storage tank flow back to the filter, and the filter components of the filter are automatically backwashed. Under the premise of ensuring the smooth progress of the sewage test, the number of times the filter needs to be cleaned manually is reduced, the operation and maintenance costs are reduced, and the entire backwashing process does not require additional energy consumption, is safe and reliable, and achieves the purpose of cost reduction and efficiency improvement. Attached Figure Description

[0012] The above and / or other aspects and advantages of this invention will become clearer and more readily understood through the following detailed description taken in conjunction with the accompanying drawings, which are merely illustrative and do not limit the invention, wherein:

[0013] Figure 1 This is a schematic diagram of a wastewater filtration and water intake system with automatic backwashing function, which relates to this utility model.

[0014] Reference numerals in the attached diagram: 1. Sewage tank; 2. Booster pump; 3. Water intake pipe; 4. Filter; 401. Inlet; 402. Outlet; 403. Filter assembly; 404. Drain valve; 5. Water supply pipe; 6. Water storage tank; 601. First liquid level; 602. Second liquid level; 603. Third liquid level; 7. Float-type liquid level switch; 8. Electromagnetic flow meter; 9. Siphon failure valve. Detailed Implementation

[0015] In the following description, an embodiment of a wastewater filtration and water intake system with automatic backwashing function according to the present invention will be described with reference to the accompanying drawings. The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the present invention, and are illustrative and exemplary, and should not be construed as limiting the implementation or scope of the present invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein.

[0016] In the description of this utility model, it should be noted that the terms "front," "rear," "left," "right," "top," "bottom," "upper," "lower," "inner," "outer," "horizontal," "vertical," "upright," and "oblique," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] The accompanying drawings in this specification are schematic diagrams used to illustrate the concept of this utility model, and schematically show the shapes of the various parts and their interrelationships. Please note that, in order to clearly show the structure of the components of the embodiments of this utility model, the drawings are not drawn to the same scale. The same reference numerals are used to indicate the same parts.

[0018] The principles and features of this utility model are described below with reference to the accompanying drawings. The embodiments described are only for explaining this utility model and are not intended to limit the scope of this utility model. The following description, in conjunction with... Figure 1 The preferred embodiments of this utility model will be described in further detail below:

[0019] like Figure 1As shown, a preferred embodiment of this utility model, a wastewater filtration and water intake system with automatic backwashing function, includes a wastewater tank 1, a lift pump 2, a filter 4, a water storage tank 6, and a float-type level switch 7. The inlet of the lift pump 2 is connected to the wastewater tank 1, and the outlet of the lift pump 2 is connected to the inlet 401 of the filter 4 via a water intake pipe 3. The outlet 402 of the filter 4 is connected to the water storage tank 6 via a water delivery pipe 5. The end of the water delivery pipe 5 is located at the second liquid level 602 of the water storage tank 6, and the elevation of the second liquid level 602 is always higher than the liquid level of the wastewater tank 1 (typically, the second liquid level 602 needs to be 2-4m higher than the liquid level in the wastewater tank 1) to ensure that the system can achieve automatic backwashing of the filter 4 through siphon action. A float-type level switch 7 is installed in the water storage tank 6. The float-type level switch 7 is connected to the lift pump 2 and can control the start and stop of the lift pump 2. When the liquid level in the water storage tank 6 is at the first liquid level 601, which is higher than the second liquid level 602, the float-type level switch 7 is opened, the lift pump 2 stops working, the water intake stops, and the liquid in the water storage tank 6 flows back along the water supply pipe 5 to the filter 4 to backwash the filter 4. When the liquid level in the water storage tank 6 is lower than the second liquid level 602, the end of the water supply pipe 5 is separated from the water surface, and the backwashing stops. When the liquid level in the water storage tank 6 is at the third liquid level 603, which is lower than the second liquid level 602, the float-type level switch 7 is closed, the lift pump 2 is started, and the liquid in the sewage tank 1 is pumped to the water storage tank 6.

[0020] Since municipal sewage often contains fibrous materials such as hair, these materials can become entangled and agglomerated on the filter components 403, such as screens or grid bars, inside the filter 4. Moreover, cleaning the filter components 403 by backwashing alone is not very effective in removing these fibrous materials. As a result, the water permeability and filtration performance of the filter components 403 will be greatly reduced over time. Therefore, in some preferred embodiments, the filter 4 is also equipped with a drain valve 404 at the bottom. The sewage retained in the filter 4 can be drained through the drain valve 404, and then the fibrous materials such as hair entangled on the filter components 403 can be thoroughly removed by maintenance personnel. Of course, the drain valve 404 can also be used during the maintenance of the filter 4 and the replacement of internal components.

[0021] Considering the inherent unevenness of wastewater, the content of large particulate impurities varies across different types of wastewater. Therefore, the number of large particulate pollutants retained by the filter assembly 403 after each water intake by the booster pump 2 is not uniform. Wastewater with a higher content of large particulate impurities requires more water for backwashing, while wastewater with a lower content requires less backwash water. To better adjust the backwash water volume according to actual site conditions, in some preferred embodiments, the elevation of the second liquid level 602 at the end of the water supply pipe 5 can be adjusted according to the actual backwash water demand. When the backwash water demand is high, the end of the water supply pipe 5 can be lowered; when the backwash water demand is low, the end of the water supply pipe 5 can be lowered. The end of the pipe can be lifted. Of course, there are many ways to achieve this function. For example, the end of the water pipe 5 can be set as a combination pipe with several pipe sections sealed and connected. The elevation of the pipe opening (i.e., the second liquid level 602) can be adjusted by increasing or decreasing the number of pipe sections. Alternatively, this function can be achieved by using a flexible pipe in conjunction with a winding assembly. When the end of the water pipe 5 needs to be lowered, a longer pipe body can be released from the winding assembly to lower it. When the end of the water pipe 5 needs to be lifted, the extra pipe body can be wound onto the roller body for storage using the winding assembly. It should be noted that in order to ensure the stability of the elevation of the end of the water pipe 5 after adjustment, the flexible pipe water pipe 5 usually needs to have a counterweight assembly suspended at the end to prevent it from floating.

[0022] Even within the same wastewater tank 1, the content of large particulate impurities in the wastewater flowing into the filter 4 varies at different times. If the same amount of water is used for backwashing the filter component 403 each time, it is inevitable that the filter component 403 will be cleaned before the backwashing is finished. In this case, the wastewater that is pumped to the water storage tank 6 by consuming energy will flow back to the wastewater tank 1, resulting in waste. Therefore, in some preferred embodiments, a siphon failure valve 9 is also provided on the water supply pipe 5. The siphon failure valve 9 is preferably located on the top bend of the inverted U-shaped water supply pipe 5 and is normally closed. When it is necessary to interrupt the backwashing operation, the siphon failure valve 9 can be opened to allow air to enter the water supply pipe 5 and interrupt the continuous water column in the water supply pipe 5. Of course, after each interruption of the backwashing operation, the siphon failure valve 9 needs to be closed in time to avoid affecting the normal operation of the subsequent system.

[0023] To accurately determine the blockage status of filter 4 and whether it is necessary to stop the lift pump 2 for backwashing (i.e., when water is injected into the water storage tank 6 through the lift pump 2, if the real-time observed indicated flow rate (i.e., the operating flow rate) is less than the design threshold, such as 60% of the rated flow rate, then the lift pump 2 needs to be shut down and the filter 4 needs to be backwashed) or to open the siphon break valve 9 to interrupt the backwashing operation (i.e., the filter 4 has been cleaned, but the liquid level in the water storage tank 6 is still higher than the second liquid level 602, and the siphoning effect has not stopped. At this time, the subsequent backflow of sewage will cause energy waste, so it is necessary to forcibly interrupt the siphoning effect through the siphon break valve 9), in some preferred embodiments, an electromagnetic flow meter 8 is also installed on the water supply pipe 5. The electromagnetic flow meter 8 can better observe the flow rate changes of sewage in the water supply pipe 5, thereby providing a basis for judgment on forcibly stopping the lift pump 2 and forcibly interrupting the siphon backwashing.

[0024] The working principle of this utility model is as follows: Sewage in sewage tank 1 is sent to filter 4 through water intake pipe 3 by lift pump 2. After being filtered by filter component 403 inside filter 4, large particles of impurities in the sewage are trapped at filter component 403. The filtered sewage flows into water storage tank 6 through water supply pipe 5 through water outlet 402 of filter 4. There are three water level lines with different elevations in water storage tank 6 from top to bottom: first level 601, second level 602, and third level 603. When the water level in water storage tank 6 reaches the first level 601, float-type level switch 7 is disconnected, which drives the interlocked lift pump 2 to stop water intake. At this time, due to the continuous water column in water supply pipe 5, filter 4, and water intake pipe 3, the sewage in water storage tank 6 continuously flows back to sewage tank 1 under the siphon effect, and also siphons the water supply pipe 5, filter 4, water intake pipe 3, and lift pump 2 along the way. The backwashing process removes large particles of impurities trapped by the filter element 403 of filter 4 and flushes them back into the sewage tank 1. When the liquid level in the storage tank 6 drops below the second level 602, the siphon is broken because the end of the water supply pipe 5 is disconnected from the liquid surface, and the backwashing stops. At this time, the remaining water in the storage tank 6 is the water that has been pretreated by filter 4 to remove large particles of impurities, which can be used by subsequent small-scale sewage test equipment or small-scale sewage test systems. When the filtered water in the storage tank 6 is used continuously and the liquid level continues to drop to the third level 603, the float-type liquid level switch 7 is turned on, and the interlocking lift pump 2 is turned on to filter the sewage in the sewage tank 1 again and lift it into the storage tank 6. Since a backwash is automatically performed after each water intake, the probability of clogging of the filter element 403 of filter 4 is greatly reduced, achieving the purpose of automatically cleaning the filtered impurities and greatly reducing the number of manual maintenance operations.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wastewater filtration and water intake system with automatic backwashing function, characterized in that: The system includes a sewage tank (1), a booster pump (2), a filter (4), a water storage tank (6), and a float-type level switch (7). The inlet of the booster pump (2) is connected to the sewage tank (1), and the outlet of the booster pump (2) is connected to the inlet (401) of the filter (4) through a water intake pipe (3). The outlet (402) of the filter (4) is connected to the water storage tank (6) through a water supply pipe (5). The end of the water supply pipe (5) is located at the second liquid level (602) of the water storage tank (6), and the elevation of the second liquid level (602) is higher than the liquid level of the sewage tank (1). The float-type level switch (7) is installed in the water storage tank (6), connected to the booster pump (2), and can control the booster pump. (2) When the liquid level in the reservoir (6) is at the first liquid level (601) higher than the second liquid level (602), the float-type liquid level switch (7) is disconnected, the lift pump (2) stops working, the water inlet stops, and the liquid in the reservoir (6) flows back to the filter (4) along the water pipe (5) to backwash the filter (4); when the liquid level in the reservoir (6) is lower than the second liquid level (602), the end of the water pipe (5) is separated from the water surface, and the backwashing stops; when the liquid level in the reservoir (6) is at the third liquid level (603) lower than the second liquid level (602), the float-type liquid level switch (7) is closed, the lift pump (2) is started, and the liquid in the sewage tank (1) is pumped to the reservoir (6).

2. The wastewater filtration and water intake system with automatic backwashing function according to claim 1, characterized in that: The filter (4) is equipped with an air vent valve (404) at the bottom.

3. A wastewater filtration and water intake system with automatic backwashing function according to claim 1, characterized in that: A siphon failure valve (9) is installed on the water supply pipe (5).

4. A wastewater filtration and water intake system with automatic backwashing function according to claim 3, characterized in that: An electromagnetic flow meter (8) is also installed on the water supply pipe (5).

5. A wastewater filtration and water intake system with automatic backwashing function according to claim 1, characterized in that: The elevation of the second liquid level (602) at the end of the water supply pipe (5) is adjustable.

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