Gravity type filtering system for sewage treatment

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a gravity type filtering system for sewage treatment. Comprising a distribution tank, a cleaning water tank, a filtering tank and a water producing tank which are arranged from top to bottom, the filtering tank and the water producing tank are of closed structures, the filtering end of the filtering tank is communicated with the water producing tank, and the distribution tank and the cleaning water tank are of open structures; the lower end of the distribution tank is communicated with the filter tank through a fluid dredging integrated component; the water producing tank is communicated with the cleaning tank through a flow guide pipe. The gravitational potential energy is fully utilized by adopting the height difference, and the water can be promoted to naturally flow from the distribution tank to the filter tank and finally converge into the water production tank without additional power, so that the operation energy consumption is obviously reduced. The cleaning water tank is connected with the water producing tank through a flow guide pipe, so that backwashing operation is facilitated. By means of the design, the backwashing process is simplified, water storage is not needed, the maintenance time is shortened, and continuous and efficient operation of the filtering system is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a gravity filtering system for sewage treatment. Background Art

[0002] In the current water treatment industry, especially in the field of sewage treatment, efficient, economical and sustainable filtration technology is the key. Traditional sewage treatment methods often rely on mechanical pressure or chemical treatment methods. Although these methods can effectively remove suspended solids, organic matter and other pollutants in water to a certain extent, they are also accompanied by high energy consumption, complex operating procedures and potential secondary pollution risks. In particular, pressure filtration systems require additional pressurizing equipment (such as pumps) to push water through the filter medium, resulting in increased operating costs and possible high maintenance requirements.

[0003] Gravity filtration technology, as a more environmentally friendly and energy-saving treatment method, has gradually attracted the attention of the industry. It uses the gravity flow of water itself for filtration, reducing dependence on external energy and thus reducing operating costs. However, early gravity filters had some limitations, such as the lack of an effective backwashing mechanism, which caused the filtration efficiency to decrease over time, and the maintenance cycle was short, affecting the continuous processing capacity and water quality. In addition, the cleaning pool and the filtration unit in some designs were not separated, so the backwashing operation required pre-water storage, which extended the treatment cycle and reduced the overall treatment efficiency. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a gravity filtration system for sewage treatment, which solves the technical problems of high energy consumption and low backwashing efficiency during the filtration process.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose, the main technical scheme adopted by the utility model includes a gravity filtration system for sewage treatment, including a distribution tank, a cleaning water tank, a filter tank and a water production tank arranged from top to bottom, the filter tank and the water production tank are closed structures, the filter end of the filter tank is connected with the water production tank, and the distribution tank and the cleaning water tank are open structures; the lower end of the distribution tank is connected with the filter tank through a fluid diversion integrated component, and the water production tank is connected with the cleaning water tank through a guide pipe.

[0008] Optionally, the upper port of the guide pipe is connected to the lower end of the cleaning pool, the lower port of the guide pipe is connected to the lower end of the water production pool, and a guide valve is arranged in the middle of the guide pipe.

[0009] Optionally, the fluid drainage integrated component includes a first water pipe, a second water pipe and a third water pipe that are interconnected to form a T-shaped pipe, the first water pipe is connected to the bottom of the distribution tank, and the second water pipe is horizontally arranged to be connected to the top of the filter tank.

[0010] Optionally, it also includes a water level sensor, which is arranged at the upper part of the first water pipe and below the distribution pool; an inlet valve is arranged at the lower part of the first water pipe; and a drain valve is arranged in the middle part of the third water pipe.

[0011] Optionally, multiple layers of filter material are arranged inside the filter pool, a filter plate is arranged at the bottom (filter end) of the filter pool, and a water production pool is arranged below the filter plate.

[0012] Optionally, an exhaust pipe is also included, the lower end of the exhaust pipe passes through the bottom plate of the cleaning water tank and is connected to the top of the filter tank, and the upper end of the exhaust pipe is located above the distribution tank.

[0013] Optionally, a first overflow port is provided at the upper end of the distribution tank, and a second overflow port is provided at the upper end of the cleaning tank.

[0014] Optionally, a distribution pool bracket is further included, the lower end of the distribution pool bracket is arranged at the bottom of the cleaning pool, and the upper end of the distribution pool bracket is fixedly connected to the cleaning pool.

[0015] Optionally, a vent pipe and an air inlet pipe are provided at the lower end of the water production pool, and a vent valve and an air inlet valve are provided on the vent pipe and the air inlet pipe, respectively.

[0016] Optionally, the system comprises a plurality of parallel groups of gravity filtration units, and each group of gravity filtration units is connected to the distribution tank of the first group of gravity filtration units through its corresponding fluid drainage integrated component.

[0017] (III) Beneficial effects

[0018] The beneficial effect of the utility model is that the height difference setting fully utilizes the gravitational potential energy, and can promote the natural flow of water without additional power, flowing from the distribution pool to the filtration pool, and finally into the water production pool. This filtration process significantly reduces the operating energy consumption and greatly reduces electricity consumption and operating costs.

[0019] The closed structure design adopted by the filter pool and the water production pool not only effectively locks the water quality and prevents the intrusion of external pollutants, but also ensures the constant internal pressure and creates a stable environment conducive to the filtration process. At the same time, through the synergistic effect of atmospheric pressure and gravitational potential energy, the purified water can be naturally and efficiently transferred from the water production pool to the cleaning pool without external assistance, and then prepare for the next stage of treatment and utilization.

[0020] The cleaning pool is connected to the water production pool through a guide pipe, which is convenient for backwashing operations, timely removing the accumulated impurities in the filter pool and restoring the filtering performance of the filter media. This design simplifies the backwashing process, eliminates the need for water storage, shortens maintenance time, and ensures the continuous and efficient operation of the filtration system.

[0021] The vertical arrangement design helps to save space and improve the utilization rate of land resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a single pool of the utility model;

[0023] Figure 2 It is a schematic diagram of the double-tank structure of the utility model;

[0024] [Description of Reference Numerals]

[0025] 1: distribution tank; 2: cleaning tank; 3: filter tank; 4: water production tank; 5: fluid diversion integrated component; 6: diversion pipe; 7: diversion valve; 8: water level sensor; 9: water inlet valve; 10: drain valve; 11: filter material; 12: filter plate; 13: exhaust pipe; 14: first overflow port; 15: second overflow port; 16: distribution tank bracket; 17: vent pipe; 18: air inlet pipe; 19: vent valve; 20: air inlet valve; 21: gravity filter unit;

[0026] 51: first water pipe; 52: second water pipe; 53: third water pipe. DETAILED DESCRIPTION

[0027] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific implementation methods. Figure 1 The orientation is used as a reference.

[0028] This technical solution realizes energy-free gravity flow filtration of purified water or sewage filtration by reasonably arranging the tank structure and the filter layer, eliminating the high-power water inlet pump of the traditional sand filter tank; the backwashing of the filter layer is realized by clever valve arrangement, eliminating the high-flow backwashing pump of the traditional sand filter tank; by adding a cleaning water tank 2 located above the filter tank 3, the disadvantage of the traditional gravity filter tank backwashing requiring water storage is reduced, and the backwashing time is reduced; by adding a partition between the filter tank 3 and the filter tank 3, each filter tank 3 works separately, and 2-4 sets of separate filter tanks 3 are realized. The backwashing of a single tank does not affect the normal filtration of other filter tanks 3, improving the stability of the equipment and reducing the impact on the water quality of the produced water; by operating multiple tanks in parallel, the cleaning water tank 2 is shared, the backwashing water volume is increased, and the backwashing efficiency is improved. This utility model reduces the operating energy consumption cost, improves the water quality, and realizes unattended operation.

[0029] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0030] Embodiment 1:

[0031] Reference Figure 1 and Figure 2 A gravity filtration system for sewage treatment includes a distribution tank 1, a cleaning water tank 2, a filter tank 3 and a water production tank 4 arranged from top to bottom. The filter tank 3 and the water production tank 4 are closed structures. The filtering end of the filter tank 3 is connected with the water production tank 4. The distribution tank 1 and the cleaning water tank 2 are open structures; the lower end of the distribution tank 1 is connected with the filter tank 3 through a fluid drainage integrated component 5, and the water production tank 4 is connected with the cleaning water tank 2 through a guide pipe 6.

[0032] Figure 1 and Figure 2 Water baffles are arranged at the front ends of the middle distribution pool 1 and the cleaning pool 2. For better display effect, the corresponding water baffles are omitted. In addition, the open structure refers to the top part being open and the whole being open, ensuring communication with the atmosphere and providing power through pressure difference.

[0033] exist Figure 1 and Figure 2 In the display, in order to clearly and intuitively present the core structure and working principle of the system, the actual configuration of the water baffle at the front end of the distribution tank 1 and the cleaning tank 2 is deliberately omitted. In addition, the concept of "open structure" mentioned specifically refers to the open design at the top of the distribution tank 1 and the cleaning tank 2. The open structure refers to the partial opening and full opening of the top. This design ensures the free connection between the pool body and the outside atmosphere. In this way, the system can make full use of the pressure difference in nature as the core power to drive the water flow and filtration process, without relying on additional mechanical energy input, so as to be efficient and save energy and reduce emissions.

[0034] By cleverly utilizing natural gravity and atmospheric pressure differences as driving forces, the system achieves natural flow and filtration of water without the need for additional energy input, greatly reducing operating costs and energy consumption, and complying with the concepts of sustainable development and environmental protection.

[0035] The open design of the distribution pool 1 and the cleaning pool 2 not only promotes air circulation and reduces the odor and gas accumulation problems that may be generated in the closed space, but also realizes natural ventilation through direct contact with the atmosphere, further reducing energy consumption and environmental pollution.

[0036] The system can automatically adjust according to water level changes. For example, when the water level rises to a certain height, a backwash operation is triggered. No complicated manual intervention is required, which enhances the stability and adaptability of the system.

[0037] The design of the closed filter pool 3 and the water production pool 4, in conjunction with the highly efficient multi-layer filter material 11, effectively removes suspended solids and harmful substances in the water, ensures the effluent quality, and meets high standards for discharge or reuse.

[0038] Reference Figure 1 The upper end of the guide pipe 6 is connected to the lower end of the cleaning water pool 2, the lower end of the guide pipe 6 is connected to the lower end of the water production pool 4, and a guide valve 7 is arranged in the middle of the guide pipe 6.

[0039] The upper end of the flow guide pipe 6 is directly connected to the lower end of the cleaning pool 2, ensuring that the water purified by the filter pool 3 can be quickly and directly transported to the cleaning pool 2, reducing the intermediate links and improving the efficiency of water transportation. The direct connection design of the flow guide pipe 6 optimizes the spatial layout between the pools, reduces the need for additional pipes, makes the entire system structure more compact, and is conducive to saving space, which is particularly important in places with limited space.

[0040] Reference Figure 1 The fluid drainage integrated assembly 5 includes a first water pipe 51, a second water pipe 52 and a third water pipe 53 which are interconnected to form a T-shaped pipe. The first water pipe 51 is connected to the bottom of the distribution tank 1, and the second water pipe 52 is arranged horizontally and connected to the top of the filter tank 3. The third water pipe 53 discharges to the next stage of the water treatment process.

[0041] Through the T-tube structure, the first water pipe 51 is directly connected to the bottom of the distribution tank 1, ensuring that the treated water can be evenly and effectively transported from the distribution tank 1 to the filter tank 3, improving the uniformity and efficiency of hydraulic distribution. Such a design helps to maximize the storage and distribution functions of the distribution tank 1, ensuring that each filter unit obtains a consistent water flow, thereby improving the processing capacity and stability of the overall filtration system.

[0042] The second water pipe 52 is connected horizontally to the top of the filter tank 3, ensuring that the water flow can smoothly and fully pass through the multi-layer filter material 11 of the filter tank 3, promoting effective contact between the water body and the filter material 11, and improving the efficiency of impurity removal. This design is also convenient for optimizing the filtration process, extending the service life of the filter material 11, and reducing the maintenance frequency by adjusting the speed and amount of water flow entering at different time periods or processing requirements.

[0043] The integrated design of the T-tube simplifies the internal structure of the system, making maintenance and repair work more convenient. For example, if a part of the water pipe is blocked or needs to be replaced, the staff can directly deal with the corresponding water pipe without affecting the operation of the entire system, which improves the pertinence and efficiency of maintenance.

[0044] Reference Figure 1 , and also includes a water level sensor 8, which is arranged at the upper part of the first water pipe 51 and below the distribution tank 1; an inlet valve 9 is arranged at the lower part of the first water pipe 51; and a drain valve 10 is arranged in the middle part of the third water pipe 53.

[0045] Reference Figure 1 A plurality of layers of filter material 11 are arranged inside the filter pool 3 , a filter plate 12 is arranged at the bottom (filter end) of the filter pool 3 , and a water production pool 4 is arranged below the filter plate 12 .

[0046] The multiple layers of filter material 11 arranged inside the filter pool 3 form a graded filtration system. The filter materials 11 of different levels can capture particles and impurities of different sizes, with larger particles being intercepted in the upper layer and smaller particles being gradually removed in the lower layer of filter material 11. This design greatly improves the filtration efficiency and ensures the effluent water quality.

[0047] The filter plate 12 is located at the bottom of the filter pool 3, close to the water production pool 4, and plays a role in further blocking residual impurities. It can effectively block small particles that may penetrate the multi-layer filter material 11, ensuring the cleanliness of the water that eventually flows into the water production pool 4, and is a key barrier in the entire filtration process.

[0048] Directly below the filter plate 12 is the water production pool 4. This layout clearly distinguishes the filtration area from the water production area, avoiding the backflow of suspended matter or filtered impurities that may be generated during the filtration process, ensuring the purity of the water quality in the water production pool 4, and providing high-quality water for subsequent use or further processing.

[0049] The arrangement of the multi-layer filter material 11 and the filter plate 12 facilitates regular backwashing and maintenance. When the filter material 11 is clogged and affects the filtration efficiency, the filter material 11 and the filter plate 12 can be backwashed by using the water in the cleaning pool 2 to remove the accumulated impurities and restore the filtration performance. The maintenance process is relatively simple and efficient.

[0050] Reference Figure 1 , and also includes an exhaust pipe 13, the lower end of the exhaust pipe 13 passes through the bottom plate of the cleaning water tank 2 and is connected to the top of the filtering tank 3, and the upper end of the exhaust pipe 13 is located above the distribution tank 1.

[0051] Reference Figure 1 A first overflow port 14 is provided at the upper end of the distribution tank 1 , and a second overflow port 15 is provided at the upper end of the cleaning tank 2 .

[0052] The lower end of the exhaust pipe 13 is connected to the top of the filter pool 3, and the upper end is located above the distribution pool 1, which ensures that the gas generated in the filter pool 3 can be discharged smoothly. During the filtration process, gas may be generated when the water flows and the filter material 11 is backwashed. If it is not removed in time, these gases will hinder the water flow and reduce the filtration efficiency. The existence of the exhaust pipe 13 effectively solves this problem, maintains the stability of the internal pressure of the filter pool 3, and ensures that the filtration process proceeds smoothly.

[0053] By exhausting the air, it is possible to avoid the accumulation of bubbles in the filter material 11, reduce the adverse effects on the filtering efficiency of the filter material 11, and further improve the quality and efficiency of water purification.

[0054] The first overflow port 14 of the distribution tank 1 and the second overflow port 15 of the cleaning tank 2 provide the system with water volume control and safety protection measures. When the system inputs too much water or the processing capacity reaches the upper limit, the excess water can be discharged through the overflow port, avoiding the risk of overflow caused by too high water level, protecting the safety of the system structure, and maintaining the stable operation of the processing flow.

[0055] The overflow port makes the system more adaptable when facing water volume fluctuations. In the rainy season or peak water usage period, the system can automatically adjust the processing volume to avoid overload operation, and when the water level is low, it ensures that there is enough water depth to maintain the filtration efficiency. This design increases the flexibility and stability of the system operation.

[0056] Reference Figure 1 , and also includes a distribution pool bracket 16, the lower end of the distribution pool bracket 16 is arranged at the bottom of the cleaning pool 2, and the upper end of the distribution pool bracket 16 is fixedly connected to the bottom of the distribution pool 1.

[0057] Reference Figure 1 A vent pipe 17 and an air intake pipe 18 are provided at the lower end of the water production pool 4, and a vent valve 19 and an air intake valve 20 are provided on the vent pipe 17 and the air intake pipe 18 respectively.

[0058] The lower end of the distribution tank bracket 16 is fixed to the bottom of the cleaning tank 2, and the upper end is tightly connected to the bottom of the distribution tank 1. This design ensures that the distribution tank 1 is firmly suspended above the cleaning tank 2, and the structural stability can be maintained even when it is fully loaded or encounters external forces. This layout not only saves ground space, but also optimizes the vertical layout of the water treatment process and improves space utilization.

[0059] The vent pipe 17 and air inlet pipe 18 at the lower end of the water pool, equipped with a vent valve 19 and an air inlet valve 20, give the system a high degree of operational flexibility. When maintenance, cleaning of the filter material or system overhaul is required, the water in the water production pool 4 can be quickly emptied by opening the vent valve 19, which is convenient for personnel to enter or perform internal cleaning. The setting of the air inlet valve 20 introduces air during backwashing or specific operations to help loosen the sediment in the filter material 11, improve the backwashing efficiency, and maintain the gas balance inside the filter pool 3 to prevent negative pressure damage.

[0060] Reference Figure 1 and Figure 2 The system includes a plurality of parallel gravity filtration units 21 , and each group of gravity filtration units 21 is connected to the distribution pool 1 of the first group of gravity filtration units through its corresponding fluid drainage integrated component 5 .

[0061] By connecting multiple groups of gravity filter units 21 in parallel, the system can significantly improve the overall sewage treatment or water purification capacity. Each additional group of units is equivalent to directly increasing the system's processing capacity, which is particularly important when the processing demand fluctuates greatly or the processing scale needs to be expanded, and can flexibly respond to water treatment needs of different time periods or different scales. The multi-group parallel design means that even if individual units need to be temporarily shut down due to maintenance, failure or cleaning, the remaining units can continue to work, ensuring the continuity of the water treatment process and the overall stability of the system. The parallel structure allows independent maintenance or replacement of filter materials 11 for individual filter units without suspending the operation of the entire system, greatly reducing downtime and reducing the impact on daily operations. At the same time, group management also facilitates more detailed monitoring of the operating status of each unit, timely adjustment and optimization, and improved maintenance efficiency.

[0062] When each filter pool 3 is clogged, the water level rises. When the water level rises to the water level sensor 8, the valve is switched for backwashing.

[0063] Because the cleaning pool 2 is above the filter pool 3, if air enters the filter pool 3, it will generate an atmospheric pressure, which will hinder the filtration by the pressure difference, so an exhaust hole is set at the top of the filter pool to be discharged through the exhaust pipe 13. At the same time, a small amount of unfiltered sewage will be carried in the exhaust process, so the exhaust pipe 13 is set above the distribution pool 1, and the sewage flows back to the distribution pool 1.

[0064] The specific specifications of the distribution pool 1 are 1 meter in length, 1 meter in width, and 1 meter in height; the cleaning pool 2 maintains a height of 1 meter; the filter pool 3 is designed to be 3 meters in length, 3 meters in width, and 1.5 meters in height; the water production pool 4 is the same size as the filter pool 3, but the height is halved to 0.5 meters. The configuration of key pipelines in the system includes: the diversion pipe 6 uses a diameter of DN300 to ensure smooth water flow; the vent valve 19 is designed to be DN50 for quick emptying; the diversion valve 7 is also DN300 to meet the needs of large flow regulation; the intake valve 20 and the exhaust pipe 13 are respectively DN50 in size to accurately control gas circulation; the drain valve 10 uses DN200 to ensure efficient drainage; the water inlet valve 9 matches the specification of DN200 to adapt to the corresponding water inlet flow. In terms of filter material 11, the system is compatible with materials such as quartz sand, activated carbon, anthracite, manganese sand, ceramsite or sulfur ore, and one or more can be flexibly used according to actual needs. As for the valve operation mode, the vent valve 19 and the diverter valve 7 are both manually operated for easy instant regulation, while the air inlet valve 20, the drain valve 10 and the water inlet valve 9 are all electrically controlled to achieve automated management and precise control.

[0065] In the daily operation mode, the system is configured as follows: the drain valve 19 is kept closed to prevent water loss, and the air inlet valve 20 and the drain valve 10 are also closed to ensure sealing. At the same time, the diversion valve 7 is opened to guide the water flow, and the water inlet valve 9 is activated to start the water treatment process. The treated water is evenly distributed through the distribution tank 1 and flows to 1 to 4 independent filter units. The water flows through the first water pipe

[0066] 51 and the second water pipe 52, pass through the multi-layer filter material 11 in each filter pool 3, and are further purified with the assistance of the filter plate 12, and then merge into the water production pool 4. The filtered clean water rises along the guide pipe 6, is injected into the cleaning water pool 2, and is smoothly discharged through the second overflow port 15 after the pool is full. This process relies on the water level difference and pressure gradient naturally formed in the system, and does not require additional energy to achieve efficient gravity-driven filtration. The daily processing capacity of a single filter pool 3 is 500 cubic meters of sewage or an equivalent of 1,000 cubic meters of purified water. The filtration rate is set to 5 meters / hour for sewage or 10 meters / hour for purified water, and the cross-sectional area of ​​each pool is 9 cubic meters. When four sets of filter pools 3 operate in parallel, the maximum daily sewage processing capacity can reach 2,000 cubic meters, or 4,000 cubic meters of purified water.

[0067] The backwashing procedure is adjusted as follows: the vent valve 19 continues to remain closed, the water inlet valve 9 is closed to interrupt the water inlet, the diversion valve 7 is opened, and the drain valve 10 and the air inlet valve 20 are opened at the same time. At this stage, a large amount of purified water reversely passes through the diversion pipe 6, reversely permeates the filter pool 3 with the help of the filter plate 12, and deeply cleans the filter material 11. The cleaning wastewater is introduced into the third water pipe 53 through the second water pipe 52 and discharged. The whole backwashing process is more thorough with the assistance of air intake, and the water level difference and pressure difference in the system are also used to provide the driving force required for backwashing.

[0068] As for the emptying and maintenance process: the water inlet valve 9, the diversion valve 7, the drain valve 10 and the air inlet valve 20 are all closed, and only the vent valve 19 is opened, so that the designated filter pool 3 can be independently emptied for maintenance or replacement of the filter material 11. This operation will not interfere with the normal operation of other pools or the ongoing backwashing operation.

[0069] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0072] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0073] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A gravity filtration system for sewage treatment, characterized in that: The invention comprises a distribution pool (1), a cleaning pool (2), a filter pool (3) and a water production pool (4) arranged from top to bottom, wherein the filter pool (3) and the water production pool (4) are closed structures, the filter end of the filter pool (3) is connected to the water production pool (4), and the distribution pool (1) and the cleaning pool (2) are open structures; the lower end of the distribution pool (1) is connected to the filter pool (3) through a fluid drainage integrated component (5), and the water production pool (4) is connected to the cleaning pool (2) through a guide pipe (6).

2. The gravity filtration system according to claim 1, characterized in that: The upper end of the flow guide pipe (6) is in communication with the lower end of the cleaning water pool (2), the lower end of the flow guide pipe (6) is in communication with the lower end of the water production pool (4), and a flow guide valve (7) is provided in the middle of the flow guide pipe (6).

3. The gravity filtration system according to claim 1, characterized in that: The fluid drainage integrated component (5) comprises a first water pipe (51), a second water pipe (52) and a third water pipe (53) which are interconnected to form a T-shaped pipe, wherein the first water pipe (51) is connected to the bottom of the distribution tank (1), and the second water pipe (52) is arranged horizontally and connected to the top of the filter tank (3).

4. The gravity filtration system according to claim 3, characterized in that: It also includes a water level sensor (8), which is arranged at the upper part of the first water pipe (51) and below the distribution pool (1); an inlet valve (9) is arranged at the lower part of the first water pipe (51); and a drain valve (10) is arranged in the middle part of the third water pipe (53).

5. The gravity filtration system according to claim 1, characterized in that: Multiple layers of filter material (11) are arranged inside the filter pool (3), a filter plate (12) is arranged at the filter end of the filter pool (3), and the water production pool (4) is located below the filter plate (12).

6. The gravity filtration system according to claim 1, characterized in that: It also includes an exhaust pipe (13), the lower end of which passes through the bottom plate of the cleaning water pool (2) and is connected to the top of the filtering pool (3), and the upper end of the exhaust pipe (13) is located above the distribution pool (1).

7. The gravity filtration system according to claim 1, characterized in that: The upper end of the distribution pool (1) is provided with a first overflow port (14), and the upper end of the cleaning pool (2) is provided with a second overflow port (15).

8. The gravity filtration system according to claim 1, characterized in that: It also comprises a distribution pool bracket (16), the lower end of which is arranged at the bottom of the cleaning pool (2), and the upper end of which is fixedly connected to the bottom of the distribution pool (1).

9. The gravity filtration system according to claim 1, characterized in that: A vent pipe (17) and an air intake pipe (18) are provided at the lower end of the water production pool (4), and a vent valve (19) and an air intake valve (20) are provided on the vent pipe (17) and the air intake pipe (18), respectively.

10. The gravity filtration system according to claim 1, characterized in that: The system comprises a plurality of parallel groups of gravity filter units (21), each group of the gravity filter units (21) being connected to the distribution pool (1) of the first group of the gravity filter units (21) via the corresponding fluid drainage integrated component (5).

Images