A sewage resource water purification device and its use method

Abstract

The present invention proposes a sewage resource-based water purification device and a method of using the same, which belongs to the field of sewage purification. It solves the problem of low flux and poor water purification effect caused by the dense filter cake layer in rural sewage treatment. A sewage resource-based water purification device includes a constant-level raw water tank, an ecological ultrafiltration membrane pool and a water collection tank. The ecological ultrafiltration membrane pool is provided with a mesh box, an upper screen, a lower screen, multiple ultrafiltration membrane assemblies and multiple aeration plates, wherein the water outlet of the constant-level raw water tank is connected to the water inlet of the ecological ultrafiltration membrane pool through an inlet pipe, and the ecological ultrafiltration membrane pool is divided into a membrane filtration chamber and an aeration chamber by the upper screen and the lower screen. The membrane bodies of the multiple ultrafiltration membrane assemblies are distributed in the membrane filtration chamber, and the water outlet assemblies of the multiple ultrafiltration membrane assemblies are installed above the upper screen, and each water outlet assembly is connected to the water collection tank through a first water outlet pipe. It is mainly used for sewage purification.

Description

Technical Field

[0001] The present invention belongs to the field of sewage purification, and in particular relates to a sewage resource purification device and a use method thereof. Background Art

[0002] Nowadays, with the rapid development of science and technology, the amount of water used and discharged by various factories has increased dramatically, causing serious water pollution. my country's large cities and towns have mature sewage treatment technologies and have better treatment methods for various types of pollution, but they are slightly insufficient in the face of various water pollution in rural areas. The sewage discharge methods in rural my country are characterized by small water volume, large fluctuations, simple pollutant composition, wide sewage sources and incomplete collection devices. The use of urban sewage treatment technology in rural areas will cause waste of resources and excessively high technical costs. Although traditional low-pressure gravity flow ultrafiltration water purification technology can reduce labor and drug inputs, it has disadvantages such as low flux due to the dense filter cake layer. It is still not very suitable for decentralized treatment of domestic sewage in rural areas. There is an urgent need to find a new model different from the traditional low-pressure gravity flow ultrafiltration to apply to rural domestic sewage.

[0003] Currently, the technologies used to treat rural domestic sewage can be broadly divided into biological treatment and ecological treatment. However, neither method alone can achieve ideal results, both suffering from issues such as high energy consumption, poor removal efficiency, high dosage of chemicals, and heavy maintenance workload. Summary of the Invention

[0004] In view of this, the present invention aims to propose a sewage resource purification device and its use method to solve the problem of low flux and poor water purification effect caused by dense filter cake layer in rural sewage treatment equipment.

[0005] To achieve the above-mentioned object, according to one aspect of the present invention, a sewage resource water purification device is provided, comprising a constant-position raw water tank, an ecological ultrafiltration membrane pool, and a water collection tank. The ecological ultrafiltration membrane pool is provided with a mesh box, an upper screen, a lower screen, multiple ultrafiltration membrane assemblies, and multiple aeration plates. The water outlet of the constant-position raw water tank is connected to the water inlet of the ecological ultrafiltration membrane pool via an inlet pipe.

[0006] The ecological ultrafiltration membrane pool is separated into a membrane filtration chamber and an aeration chamber by the upper and lower screens.

[0007] The membrane bodies of the multiple ultrafiltration membrane assemblies are distributed in the membrane filtration chamber, the water outlet assemblies of the multiple ultrafiltration membrane assemblies are installed above the upper screen, and each water outlet assembly is connected to the water collecting tank through the first water outlet pipeline.

[0008] Multiple aeration discs are distributed in the aeration chamber.

[0009] The net box is arranged vertically on one side of the membrane filtration chamber, and an inlet and outlet are provided on the side of the net box facing the ultrafiltration membrane assembly.

[0010] Several filter cake layers of phagocytic organisms are placed in the membrane filter chamber.

[0011] Furthermore, the ultrafiltration membrane assembly is a hollow fiber curtain membrane assembly or a plate-type ceramic membrane assembly.

[0012] Furthermore, when the ultrafiltration membrane assembly adopts a hollow fiber curtain membrane assembly, several hollow fiber membrane curtains are waterweed-type membrane curtains.

[0013] Furthermore, an overflow hole is provided on the upper portion of the ecological ultrafiltration membrane pool, and the overflow hole is connected to the constant-level raw water tank.

[0014] Furthermore, each aeration plate is connected to an external air source.

[0015] Furthermore, the multiple aeration plates include multiple porous aeration plates and multiple microporous aeration plates, wherein the multiple porous aeration plates are correspondingly arranged below the multiple ultrafiltration membrane modules, and the multiple microporous aeration plates are dispersedly arranged between the multiple porous aeration plates.

[0016] Furthermore, the organisms devoured by the filter cake layer are loach fry.

[0017] Furthermore, there are two water collecting tanks, which are respectively arranged on both sides of the ecological ultrafiltration membrane pool.

[0018] Furthermore, the entrance and exit of the net cage are provided with an opening and closing device.

[0019] According to another aspect of the present invention, a method for using the above-mentioned sewage resource water purification device is provided, comprising the following steps: raw water enters a constant-position raw water tank, enters an ecological ultrafiltration membrane pool from the constant-position raw water tank through a water inlet pipe, and maintains a constant water level in the ecological ultrafiltration membrane pool; the raw water enters the interior of the ultrafiltration membrane assembly under pressure, and is discharged into a water collecting tank by a water outlet assembly after being purified by the ultrafiltration membrane assembly; in the ecological ultrafiltration membrane pool, the filter cake layer is devoured by organisms that eat the biological filter cake layer on the membrane surface; aeration plates are selected from microporous aeration plates and porous aeration plates; oxygen is provided to the filter cake layer devouring organisms through the microporous aeration plates; and according to the accumulation of pollutants on the membrane surface, the porous aeration plates are started regularly to flush the membrane surface and remove pollutants on the membrane surface.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention utilizes gravity for filtration, and can maintain ideal flux without consuming energy or pressurizing;

[0022] 2. The present invention does not require the addition of chemical cleaning agents and hydraulic backwashing to control membrane fouling, thereby reducing the number of supporting devices and accessories such as water pumps and valves, which can effectively reduce chemical consumption and energy consumption, and reduce the workload of manual operation and operation;

[0023] 3. The present invention organically combines organisms with the filter membrane, so that the filter cake layer engulfing organisms feed on the biological filter cake layer on the membrane surface. The filter cake layer engulfing organisms move between the membranes, which also reduces the thickness of the biological filter cake layer, thereby improving the filter cake layer structure and increasing the membrane flux.

[0024] 4. The present invention forms a micro-ecosystem by combining the filter cake layer engulfing organisms and the ultrafiltration membrane components in the ecological ultrafiltration membrane pool, which not only improves the effluent water quality and water production, but also allows for biological breeding to increase the added value effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 This is a schematic structural diagram of a sewage resource purification device according to the present invention.

[0027] 1. Constant-level raw water tank; 2. Ecological ultrafiltration membrane pool; 3. Water collection tank; 4. Net cage; 5. Upper screen; 6. Lower screen; 7. Membrane body; 8. Outlet assembly; 9. Filter cake layer engulfing organisms; 10. Check valve; 11. Inlet valve; 12. Outlet valve; 13. Porous aeration disc; 14. Microporous aeration disc; 15. Overflow hole. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0029] Referring to the accompanying drawings, this embodiment is described. According to one aspect of the present invention, a sewage resource purification device is provided, comprising a constant-level raw water tank 1, an ecological ultrafiltration membrane pool 2, and a water collection tank 3. The ecological ultrafiltration membrane pool 2 is provided with a mesh box 4, an upper screen 5, a lower screen 6, a plurality of ultrafiltration membrane assemblies, and a plurality of aeration disks. The outlet of the constant-level raw water tank 1 is connected to the water inlet of the ecological ultrafiltration membrane pool 2 via an inlet pipe.

[0030] The ecological ultrafiltration membrane pool 2 is divided into a membrane filtration chamber and an aeration chamber by the upper block 5 and the lower block 6.

[0031] The membrane bodies 7 in the multiple ultrafiltration membrane assemblies are distributed in the membrane filtration chamber, and the water outlet assemblies 8 in the multiple ultrafiltration membrane assemblies are installed above the upper screen 5, and each water outlet assembly 8 is connected to the water collecting tank 3 through the first water outlet pipeline.

[0032] Multiple aeration discs are distributed in the aeration chamber.

[0033] The net box 4 is arranged vertically on one side of the membrane filtration chamber, and an inlet and outlet are provided on the side of the net box 4 facing the ultrafiltration membrane assembly.

[0034] Several filter cake layers of phagocytic organisms 9 are placed in the membrane filter chamber.

[0035] The water body is purified by several ultrafiltration membrane components. The constant-level raw water tank 1 is used to balance the liquid level in the ecological ultrafiltration membrane pool 2, so that the pressure in the ecological ultrafiltration membrane pool 2 is constant, so that the water enters the ultrafiltration membrane under the action of pressure for filtration, and then is discharged from the water outlet component 8 at the top of the ultrafiltration membrane, so that the water is purified.

[0036] The cake-eating organisms 9 can gnaw on the biological cake layer, thereby increasing membrane flux. During their activity, the cake-eating organisms 9 improve the cake layer structure, optimize purification efficiency, and address the low flux and severe cake layer contamination issues of traditional ultrafiltration devices.

[0037] The outlet of the constant-level raw water tank 1 is preferably located at its bottom, and the inlet of the ecological ultrafiltration membrane pool 2 is preferably located below the latter. Specifically, the inlet pipe may be connected to the aeration chamber. A check valve 10 and an inlet valve 11 are provided on the inlet pipe. The inlet valve 11 controls the opening and closing of the inlet pipe, thereby controlling the amount of water entering the ecological ultrafiltration membrane pool 2. The check valve 10 prevents water from flowing back into the constant-level raw water tank 1.

[0038] The first water outlet pipe is provided with a water outlet valve 12 for controlling the water outlet speed of the ultrafiltration membrane assembly and whether to drain water.

[0039] By arranging an entrance and an exit on the net cage 4, it is convenient to catch the engulfed organisms 9 in the filter cake layer.

[0040] The filter cake layer devouring organisms 9 mature about 5 months after being put in. After maturity, the aeration plate is turned on, the aeration volume is controlled, and the organisms are driven into the net cage 4 by air drive to be caught in the ecological ultrafiltration membrane pool 2, and then new filter cake layer devouring organisms 9 are put in again.

[0041] The present invention is applicable to the non-cleaning ultrafiltration process. During the filtration process, a functional biological layer is formed on the surface of the ultrafiltration membrane. Under the action of the predation and activity of the phagocytic organisms 9 in the filter cake layer, the biological layer forms a loose porous structure, thereby improving the flux. At the same time, the biological layer plays a pre-filtration effect, significantly reducing membrane fouling and enhancing the removal efficiency of pollutants.

[0042] The ultrafiltration process is driven by gravity flow filtration or siphon filtration, and the filtration head is 0.2-5m.

[0043] The ammonia nitrogen content of the raw water in the constant level raw water tank 1 shall not exceed 50 mg / L.

[0044] The constant-level raw water tank 1 is provided with an inlet water head, and the inlet water head pressure is 4.7 kPa.

[0045] The net box 4 is a stainless steel net box 4, and the upper blocking net 5 and the lower blocking net 6 are both made of 30-mesh stainless steel nets. The distance between the upper blocking net 5 and the lower blocking net 6 is 35 cm to limit the activity area of the filter cake layer devouring organisms 9 and ensure that the filter cake layer devouring organisms 9 prey on the filter cake layer.

[0046] The present invention utilizes gravity for filtration and can maintain an ideal flux without consuming energy or pressurizing;

[0047] The present invention does not require the addition of chemical cleaning agents and hydraulic backwashing to control membrane fouling, thereby reducing the number of matching devices and accessories such as water pumps and valves, effectively reducing chemical consumption and energy consumption, and reducing the workload of manual operation and operation;

[0048] The present invention organically combines organisms with the filter membrane, so that the filter cake layer engulfing organisms feed on the biological filter cake layer on the membrane surface. The filter cake layer engulfing organisms move between the membranes, which also reduces the thickness of the biological filter cake layer, thereby improving the filter cake layer structure and increasing the membrane flux.

[0049] The present invention forms a micro-ecosystem by combining filter cake layer engulfing organisms and ultrafiltration membrane components in an ecological ultrafiltration membrane pool, which not only improves the effluent water quality and water production, but also enables biological breeding to increase the added value effect.

[0050] The ultrafiltration membrane assembly is a hollow fiber curtain membrane assembly or a plate-type ceramic membrane assembly. This design ensures that sufficient space is provided for the filter cake layer engulfing organisms 9 in the water to move. The specific structures of the hollow fiber curtain membrane assembly and the plate-type ceramic membrane assembly are both existing technologies and will not be described here. When a hollow fiber curtain membrane assembly is used, the membrane body 7 is a hollow fiber membrane curtain, and the area occupied by the membrane assembly can be adjusted according to the membrane curtain spacing and membrane filament spacing. The hollow fiber membrane filaments that make up the hollow fiber membrane curtain are made of PVDF, and the diameter of the hollow fiber membrane filaments is 2 mm.

[0051] When the ultrafiltration membrane assembly utilizes a hollow fiber curtain, several of the hollow fiber curtains are designed as waterweed curtains. Specifically, the top ends of the hollow fiber membrane filaments within the curtain are fixed and connected to the outlet assembly 8, while the bottom ends of the filaments are closed but not fixed, providing more space for phagocytic organisms in the filter cake layer to move. The spacing between the membrane curtains is at least 10 cm, and the spacing between the membrane filaments within the same curtain is 2 mm to 10 mm, ensuring sufficient space for phagocytic organisms 9 in the filter cake layer to move.

[0052] An overflow hole 15 is provided on the upper part of the ecological ultrafiltration membrane pool 2, and the overflow hole 15 is connected to the constant-position raw water tank 1. With this design, the overflow hole 15 is connected to the constant-position raw water tank 1 through the second outlet pipe. The setting of the overflow hole 15 can maintain the liquid level in the ecological ultrafiltration membrane pool 2 at the height of the overflow hole 15, thereby discharging excess water into the constant-position raw water tank 1, and cooperates with the constant-position raw water tank 1 to stabilize the liquid level of the ecological ultrafiltration membrane pool 2, thereby stabilizing the liquid pressure in the ecological ultrafiltration membrane pool 2 and helping the liquid enter the hollow fiber membrane for filtration. The water outlet pressure of the overflow hole 15 is 4.5kpa, which can stabilize the pressure of water entering the hollow fiber membrane. The number of overflow holes 15 can be determined according to the size of the ecological ultrafiltration membrane pool 2. When the number of overflow holes 15 is two or more, each overflow hole 15 is connected to the constant-position raw water tank 1 through the second outlet pipe.

[0053] Each aeration plate is connected to an external air source. Such a design provides enough oxygen for the ecological ultrafiltration membrane pool 2, provides protection for the life of the filter cake layer devouring organisms 9 in the ecological ultrafiltration membrane pool 2, and at the same time, can also be started regularly to remove pollutants on the membrane surface.

[0054] The multiple aeration plates include multiple porous aeration plates 13 and multiple microporous aeration plates 14, wherein the multiple porous aeration plates 13 are correspondingly arranged below the multiple ultrafiltration membrane assemblies, and the multiple microporous aeration plates 14 are dispersedly arranged between the multiple porous aeration plates 13. With such a design, the porous aeration plates 13 generate large bubbles after startup and run regularly (such as starting once every three days and running for 30 minutes each time). The large bubbles generated flush the membrane surface and remove pollutants on the membrane surface. The microporous aeration plates 14 generate microbubbles after startup and run intermittently (such as working for 2-10 minutes and then stopping for 20-90 minutes), ensuring that the dissolved oxygen in the membrane outlet water is not less than 2 mg / L, and can prevent the bubbles from causing mechanical damage to the membrane surface during aeration.

[0055] The filter cake layer engulfing organisms 9 are loach fry. In this design, 0.5-3 cm loach fry are selected and put in according to the ratio of 5-20 square centimeters of membrane area corresponding to one loach.

[0056] There are two water collecting tanks 3, one on each side of the ecological ultrafiltration membrane pool 2. With this design, the outlet assemblies 8 of the multiple ultrafiltration membrane assemblies are connected to the two water collecting tanks 3 through two first outlet pipes, allowing the water collecting tanks 3 to accommodate larger volumes of ecological ultrafiltration membrane pools 2, thereby effectively improving water purification efficiency.

[0057] The entrance and exit of the net cage 4 are provided with an opening and closing device. In such a design, the opening and closing device can be any device or structure in the prior art that can realize the opening and closing of the entrance and exit. For example, the opening and closing device is a baffle that can be manually pulled up and down. When it is pulled upward, the entrance and exit are exposed, so that the filter cake layer engulfed organisms 9 can enter the net cage 4. When fishing, the baffle can be lowered to block the entrance and exit, making it easier to fish.

[0058] According to another aspect of the present invention, a method for using the above-mentioned sewage resource water purification device is provided, comprising the following steps: raw water enters a constant-level raw water tank 1, enters an ecological ultrafiltration membrane pool 2 through a water inlet pipe from the constant-level raw water tank 1, and maintains a constant water level in the ecological ultrafiltration membrane pool 2; the raw water enters the interior of the ultrafiltration membrane assembly under the action of pressure, and is discharged into a water collecting tank 3 through a water outlet assembly 8 after being purified by the ultrafiltration membrane assembly; in the ecological ultrafiltration membrane pool 2, the filter cake layer engulfing organisms 9 gnaw on the biological filter cake layer on the membrane surface; the aeration plate uses a microporous aeration plate 14 and a porous aeration plate 13; the microporous aeration plate 14 provides oxygen to the filter cake layer engulfing organisms 9; and according to the accumulation of pollutants on the membrane surface, the porous aeration plate 13 is started regularly to flush the membrane surface and remove pollutants on the membrane surface.

[0059] The embodiments of the present invention disclosed above are intended only to illustrate the present invention. The embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A sewage resource water purification device, characterized by: The invention comprises a constant-position raw water tank (1), an ecological ultrafiltration membrane pool (2) and a water collecting tank (3), wherein a mesh box (4), an upper screen (5), a lower screen (6), a plurality of ultrafiltration membrane components and a plurality of aeration plates are arranged in the ecological ultrafiltration membrane pool (2), wherein the water outlet of the constant-position raw water tank (1) and the water inlet of the ecological ultrafiltration membrane pool (2) are connected via a water inlet pipeline. The ecological ultrafiltration membrane pool (2) is separated into a membrane filtration chamber and an aeration chamber by an upper block net (5) and a lower block net (6). The membrane bodies (7) of the plurality of ultrafiltration membrane assemblies are distributed in the membrane filtration chamber, the water outlet assemblies (8) of the plurality of ultrafiltration membrane assemblies are installed above the upper screen (5), and each water outlet assembly (8) is connected to the water collecting tank (3) through a first water outlet pipeline. Multiple aeration discs are distributed in the aeration chamber. The net cage (4) is arranged vertically on one side of the membrane filter chamber, and an inlet and outlet are provided on the side of the net cage (4) facing the ultrafiltration membrane assembly. The inlet and outlet of the net cage (4) are provided with an opening and closing device. A plurality of filter cake layer phagocytic organisms (9) are placed in the membrane filter chamber, and the net cage is used to catch the filter cake layer phagocytic organisms (9); The plurality of aeration plates include a plurality of porous aeration plates (13) and a plurality of microporous aeration plates (14), wherein the plurality of porous aeration plates (13) are correspondingly arranged below the plurality of ultrafiltration membrane assemblies, and the plurality of microporous aeration plates (14) are dispersedly arranged between the plurality of porous aeration plates (13); The filter cake layer engulfing organisms (9) are loach fry; loach fry of 0.5-3 cm are selected and placed in a ratio of 5-20 square centimeters of membrane area to one loach; After the porous aeration disc (13) is started, large bubbles are generated and run regularly. The large bubbles generated flush the membrane surface and remove pollutants on the membrane surface. After the microporous aeration disc (14) is started, micro bubbles are generated and run intermittently to provide oxygen for the filter cake layer engulfing organisms (9) and can prevent the bubbles from causing mechanical damage to the membrane surface during aeration.

2. The sewage resource water purification device according to claim 1, characterized in that: The ultrafiltration membrane assembly is a hollow fiber curtain membrane assembly or a plate-type ceramic membrane assembly.

3. The sewage resource purification device according to claim 2, characterized in that: When the ultrafiltration membrane assembly adopts a hollow fiber curtain type membrane assembly, several hollow fiber membrane curtains are waterweed type membrane curtains.

4. The sewage resource water purification device according to claim 1, characterized in that: An overflow hole (15) is provided on the upper portion of the ecological ultrafiltration membrane pool (2), and the overflow hole (15) is communicated with the constant-level raw water tank (1).

5. The sewage resource water purification device according to claim 4, characterized in that: Each aeration plate is connected to an external air source.

6. The sewage resource water purification device according to claim 1, characterized in that: There are two water collecting tanks (3) and they are respectively arranged on both sides of the ecological ultrafiltration membrane pool (2).

7. A method for using the sewage resource purification device according to any one of claims 1 to 6, characterized in that: The following steps are involved: The raw water enters the constant-position raw water tank (1), and enters the ecological ultrafiltration membrane pool (2) through the water inlet pipe from the constant-position raw water tank (1) and maintains the water level in the ecological ultrafiltration membrane pool (2) constant. The raw water enters the interior of the ultrafiltration membrane assembly under the action of pressure, and is discharged into the water collection tank (3) through the water outlet assembly (8) after being purified by the ultrafiltration membrane assembly. In the ecological ultrafiltration membrane pool (2), the filter cake layer engulfing organisms (9) gnaw on the biological filter cake layer on the membrane surface. The aeration disk uses a microporous aeration disk (14) and a porous aeration disk (13). The microporous aeration disk (14) provides oxygen for the filter cake layer engulfing organisms (9). According to the accumulation of pollutants on the membrane surface, the porous aeration disk (13) is regularly started to flush the membrane surface and remove pollutants on the membrane surface.

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