Sewage recycling water purification device and use method thereof

Abstract

The invention provides a sewage recycling water purification device and a use method thereof, and belongs to the field of sewage purification. The problems of low flux and poor water purification effect caused by compact filter cake layers in rural sewage treatment are solved. A sewage recycling water purification device comprises a constant-level raw water tank, an ecological ultrafiltration membrane pool and a water collection tank, a net cage, an upper blocking net, a lower blocking net, a plurality of ultrafiltration membrane assemblies and a plurality of aeration discs are arranged in the ecological ultrafiltration membrane pool, a water outlet of the constant-level raw water tank is communicated with a water inlet of the ecological ultrafiltration membrane pool through a water inlet pipeline, and a water outlet of the water collection tank is communicated with a water outlet of the ecological ultrafiltration membrane pool through a water outlet pipeline. The ecological ultrafiltration membrane pool is divided into a membrane filtration chamber and an aeration chamber through the upper blocking net and the lower blocking net, membrane main bodies in the multiple ultrafiltration membrane assemblies are distributed in the membrane filtration chamber, water outlet assemblies in the multiple ultrafiltration membrane assemblies are installed above the upper blocking net, and each water outlet assembly is connected to the water collection tank through a first water outlet pipeline. The device is mainly used for sewage purification.

Description

Technical Field

[0001] The invention belongs to the field of sewage purification, and in particular relates to a sewage resource water 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 have mature sewage treatment technology and have better treatment methods for various types of pollution, but it is slightly insufficient in the face of various water pollution in rural areas. The sewage discharge method in rural my country has the characteristics of small water volume, large fluctuations, simple pollutant composition, wide sewage sources and imperfect collection devices. The use of urban sewage treatment technology in rural areas will cause problems such as waste of resources and excessive technical costs. Although the traditional low-pressure gravity flow ultrafiltration water purification technology can reduce labor and drug input, it is still not very suitable for decentralized treatment of domestic sewage in rural areas due to its disadvantages such as low flux due to the dense filter cake layer. It is urgent to find a new mode different from the traditional low-pressure gravity flow ultrafiltration to apply to rural domestic sewage.

[0003] At present, the technologies used in rural domestic sewage treatment can be roughly divided into biological treatment technology and ecological treatment technology. However, neither method can achieve the desired results when operated alone, and both have problems such as high energy consumption, poor removal efficiency, large dosage, and heavy operation and maintenance workload. Summary of the invention

[0004] In view of this, the present invention aims to propose a sewage resource water purification device and a method of use thereof, so as 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 purpose, according to one aspect of the present invention, there is provided a sewage resource water purification device, comprising a constant-position raw water tank, an ecological ultrafiltration membrane pool and a water collection tank, wherein a mesh box, an upper screen, a lower screen, a plurality of ultrafiltration membrane assemblies and a plurality of aeration plates are arranged in the ecological ultrafiltration membrane pool, wherein the water outlet of the constant-position raw water tank is connected to the water inlet of the ecological ultrafiltration membrane pool through a water inlet pipeline,

[0006] The ecological ultrafiltration membrane pool is divided 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 a 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 arranged 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 type membrane assembly, several hollow fiber membrane curtains are waterweed type membrane curtains.

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

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

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

[0016] Furthermore, the organisms engulfed 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 box are provided with an opening and closing device.

[0019] According to another aspect of the present invention, there is provided a method for using the above-mentioned sewage resource water purification device, 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, is purified by the ultrafiltration membrane assembly and discharged into a water collecting tank by a water outlet assembly, the filter cake layer engulfing organisms in the ecological ultrafiltration membrane pool gnaw on the biological filter cake layer on the membrane surface, the aeration plate uses a microporous aeration plate and a porous aeration plate, oxygen is provided to the filter cake layer engulfing organisms through the microporous aeration plate, and according to the accumulation of pollutants on the membrane surface, the porous aeration plate is regularly started to flush the membrane surface to 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 an 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 pollution, thereby reducing the matching devices and accessories such as water pumps and valves, which can effectively reduce the consumption of chemicals and energy, and reduce the workload of manual operation and operation;

[0023] 3. The present invention organically combines the organisms with the filter membrane, so that the filter cake layer engulfing organisms feed on the biological filter cake layer on the membrane surface, and the filter cake layer engulfing organisms move between the membranes, which will also reduce 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-ecosphere 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 biological breeding to increase the added value effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0028] The following will be combined with the 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 in the embodiments can be combined with each other without conflict, and the described embodiments 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 water purification device is provided, comprising a constant-position raw water tank 1, an ecological ultrafiltration membrane pool 2 and a water collection tank 3. A mesh box 4, an upper screen 5, a lower screen 6, a plurality of ultrafiltration membrane assemblies and a plurality of aeration disks are arranged in the ecological ultrafiltration membrane pool 2. The water outlet of the constant-position raw water tank 1 is connected to the water inlet of the ecological ultrafiltration membrane pool 2 through a water inlet pipeline.

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

[0031] The membrane bodies 7 in the plurality of ultrafiltration membrane assemblies are distributed in the membrane filtration chamber, the water outlet assemblies 8 in 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.

[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 a number of 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 water enters the ultrafiltration membrane under pressure for filtration, and then is discharged from the water outlet component 8 at the top of the ultrafiltration membrane, thereby purifying the water.

[0036] The filter cake layer devouring organisms 9 can eat the biological filter cake layer, thereby increasing the membrane flux. The filter cake layer devouring organisms 9 will improve the filter cake layer structure and optimize the purification efficiency during the activity, and can also solve the problems of low flux and serious filter cake layer pollution in traditional ultrafiltration devices.

[0037] The outlet of the constant-position raw water tank 1 is preferably located at the bottom of the constant-position raw water tank 1, and the water inlet of the ecological ultrafiltration membrane pool 2 is preferably located at the lower part of the ecological ultrafiltration membrane pool 2, and specifically, the water inlet pipeline is connected to the aeration chamber. A check valve 10 and a water inlet valve 11 are provided on the water inlet pipeline, and the opening and closing of the water inlet pipeline is controlled by the water inlet valve 11, thereby controlling the water inflow of the ecological ultrafiltration membrane pool 2, and the check valve 10 is used to prevent water from flowing back into the constant-position raw water tank 1.

[0038] The first water outlet pipeline 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 phagocytic organisms 9 mature about 5 months after being put in. After maturity, the aeration plate is turned on, the aeration volume is controlled, and they are driven into the net cage 4 by air drive to be fished out of the ecological ultrafiltration membrane pool 2, and then new filter cake layer phagocytic 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. The biological layer forms a loose porous structure under the predation and activity of the phagocytic organisms 9 in the filter cake layer, thereby improving the flux. At the same time, the biological layer plays a pre-filtration effect, significantly reducing membrane pollution 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 and pressurizing;

[0047] The present invention does not need to add chemical cleaning agents and hydraulic backwashing to control membrane pollution, thereby reducing the matching devices and accessories such as water pumps and valves, which can effectively reduce the consumption of chemicals and energy, and reduce the workload of manual operation and operation;

[0048] The present invention organically combines organisms with filter membranes, so that the filter cake layer engulfing organisms feed on the biological filter cake layer on the membrane surface, and the filter cake layer engulfing organisms move between 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-ecosphere by combining filter cake layer engulfing organisms with ultrafiltration membrane components in an ecological ultrafiltration membrane pool, which not only improves effluent water quality and water production, but also enables biological breeding to increase added value.

[0050] The ultrafiltration membrane assembly is a hollow fiber curtain membrane assembly or a plate ceramic membrane assembly. Such a design ensures that sufficient activity space is provided for the filter cake layer engulfing organisms 9 in the water. The specific structures of the hollow fiber curtain membrane assembly and the plate ceramic membrane assembly are both prior art and will not be repeated 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 with the membrane curtain spacing and the 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 adopts a hollow fiber curtain type membrane assembly, several hollow fiber membrane curtains are waterweed type membrane curtains. That is, the top ends of several hollow fiber membrane filaments in the hollow fiber membrane curtain are fixed and connected to the water outlet assembly 8, and the bottom ends of the membrane filaments are closed but not fixed, so as to provide a larger activity space for the phagocytic organisms in the filter cake layer. The spacing between the membrane curtains is more than 10cm, and the spacing between several membrane filaments in the same membrane curtain is 2mm-10mm, which ensures the activity space for the phagocytic organisms 9 in the filter cake layer.

[0052] An overflow hole 15 is provided at 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 such a design, the overflow hole 15 is connected to the constant position raw water tank 1 through the second water outlet pipeline. 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 cooperate 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 to 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 water outlet pipeline.

[0053] Each aeration plate is connected to an external air source. Such a design provides sufficient 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 arranged correspondingly 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 being started, and run regularly (such as starting once every three days and running for 30 minutes each time). The generated large bubbles flush the membrane surface and remove pollutants on the membrane surface. The microporous aeration plates 14 generate microbubbles after being started, and run intermittently (such as working for 2-10 minutes and then stopping for 20-90 minutes), to ensure that the dissolved oxygen in the membrane outlet water is not less than 2 mg / L, and to avoid mechanical damage to the membrane surface caused by bubbles during aeration.

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

[0056] There are two water collecting tanks 3, which are arranged on both sides of the ecological ultrafiltration membrane pool 2. With such a design, the outlet assemblies 8 in the multiple ultrafiltration membrane assemblies are connected to the two water collecting tanks 3 through two first outlet pipes, respectively, so that the water collecting tanks 3 can adapt to the larger volume of the ecological ultrafiltration membrane pool 2, thereby effectively improving the 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, such as a baffle that can be manually pulled up and down, and when it is pulled upward, the entrance and exit are exposed, so that the filter cake layer engulfing organisms 9 can enter the net cage 4, and when fishing, the baffle can be put down to block the entrance and exit, which is convenient for fishing.

[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-position raw water tank 1, enters an ecological ultrafiltration membrane pool 2 through a water inlet pipe from the constant-position 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, is purified by the ultrafiltration membrane assembly and discharged into a water collecting tank 3 through a water outlet assembly 8, the filter cake layer engulfing organisms 9 in the ecological ultrafiltration membrane pool 2 gnaw the biological filter cake layer on the membrane surface, the aeration plate uses a microporous aeration plate 14 and a porous aeration plate 13, oxygen is provided to the filter cake layer engulfing organisms 9 through the microporous aeration plate 14, and according to the accumulation of pollutants on the membrane surface, the porous aeration plate 13 is regularly started to flush the membrane surface to remove pollutants on the membrane surface.

[0059] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A sewage resource water purification device, characterized in that: The invention comprises a constant-position raw water tank (1), an ecological ultrafiltration membrane pool (2) and a water collection tank (3); 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); a water outlet of the constant-position raw water tank (1) and a water inlet of the ecological ultrafiltration membrane pool (2) are connected via a water inlet pipeline. The ecological ultrafiltration membrane pool (2) is divided into a membrane filtration chamber and an aeration chamber by an upper screen (5) and a lower screen (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) via a first water outlet pipeline. Multiple aeration discs are distributed in the aeration chamber. 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. A plurality of filter cake layers of phagocytic organisms (9) are placed in the membrane filter chamber.

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 water purification device according to claim 2 is characterized by: When the ultrafiltration membrane assembly adopts a hollow fiber curtain type membrane assembly, some of the 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 part of the ecological ultrafiltration membrane pool (2), and the overflow hole (15) is connected to the constant-position raw water tank (1).

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

6. The sewage resource water purification device according to claim 1, characterized in that: 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 arranged correspondingly below the plurality of ultrafiltration membrane modules, and the plurality of microporous aeration plates (14) are dispersedly arranged between the plurality of porous aeration plates (13).

7. The sewage resource water purification device according to claim 1, characterized in that: The filter cake layer engulfing organisms (9) are loach fry.

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

9. The sewage resource water purification device according to claim 1, characterized in that: The entrance and exit of the net box (4) are provided with an opening and closing device.

10. A method for using the sewage resource water purification device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Raw water enters a constant-position raw water tank (1), and enters an ecological ultrafiltration membrane pool (2) through a water inlet pipe from the constant-position raw water tank (1) to maintain 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 collection tank (3) through a water outlet assembly (8) after being purified by the ultrafiltration membrane assembly. In the ecological ultrafiltration membrane pool (2), filter cake layer engulfing organisms (9) gnaw at 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 periodically started to flush the membrane surface to remove pollutants on the membrane surface.

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