Ultra-low consumption direct filtration system

Abstract

The utility model discloses an ultra-low consumption direct filtration system which comprises a flat membrane microfiltration assembly, a non-aeration ultrafiltration assembly and a low-pressure-difference reverse osmosis assembly, and the flat membrane microfiltration assembly is used for separating suspended matters in sewage from a water phase; the non-aeration ultrafiltration assembly is positioned at the side part of the flat membrane microfiltration assembly and is used for separating solid and liquid again and relieving membrane pollution; the low-pressure-difference reverse osmosis assembly is positioned at the side part of the non-aeration ultrafiltration assembly and is used for performing reverse osmosis filtration on the sewage to obtain drinking-grade pure water. According to the utility model, the flat membrane microfiltration component, the non-aeration ultrafiltration component and the low-pressure-difference reverse osmosis component are matched with one another, so that the ultrafiltration system does not need aeration washing, the energy consumption is saved, the filtering precision of a filtering membrane can be selected according to working conditions, the system is low in self-use water consumption, high in recovery rate and intuitive and efficient in filtering effect; and the characteristics of short production process flow, small occupied area, split mounting type assembly and short construction period are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of ultra-low energy consumption direct filtration systems, and in particular to an ultra-low energy consumption direct filtration system. Background Technology

[0002] When coal is mined, a large amount of water, known as coal mine water, is usually produced. This coal mine water, which contains a lot of coal dust and soil, needs to be transported to the surface. On the one hand, in order to protect the environment, the mine water needs to be treated. On the other hand, since coal mine water itself consumes a lot of groundwater, and water resources are relatively scarce in the mining area, the wastewater generated during the coal mining process is reused to save water resources.

[0003] When treating coal mine water, existing technologies typically employ flocculation and sedimentation in the pretreatment stage, resulting in fluctuating water quality discharge indicators. The recycled water stage utilizes a combination of precision sand filtration, carbon filtration, self-cleaning filters, ultrafiltration, an intermediate water tank, and reverse osmosis. Simultaneously, the coal dust generated from physicochemical sedimentation is treated using a sludge thickening tank and a plate and frame filter press. However, this approach suffers from several drawbacks: the flocculation and sedimentation process requires a large land area, involves numerous processes, leading to high energy consumption and the use of large amounts of flocculants. Furthermore, the recycled water treatment process involves frequent membrane use, and its numerous processes, high energy consumption, and difficulty in maintaining stable long-term equipment operation also present challenges. Additionally, the large amount of sludge generated during physicochemical sedimentation results in low treatment efficiency and high reagent costs.

[0004] Therefore, it is necessary to develop new processes to achieve a system solution with small footprint, fewer process steps, low operating energy consumption, and stable effluent indicators. The pretreatment and reclaimed water sections use new membrane treatment technologies with high throughput, low cost, and short process. The coal powder retained by membrane filtration can be combined with membrane concentration to replace the sludge concentration process. Full-volume direct pressure filtration is adopted, which has the characteristics of simplicity, convenience, space saving, and low treatment cost. Ultimately, it will realize short-process direct filtration technology and complete integrated equipment based on high-performance membrane materials. Utility Model Content

[0005] The purpose of this invention is to provide an ultra-low energy consumption direct filtration system to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an ultra-low energy consumption direct filtration system, comprising:

[0007] A flat membrane microfiltration module, wherein the flat membrane microfiltration module is used to separate suspended solids from the aqueous phase in wastewater;

[0008] An aeration-free ultrafiltration module is located on the side of a flat membrane microfiltration module. The aeration-free ultrafiltration module is used to further separate solids and liquids and alleviate membrane fouling.

[0009] A low-pressure-difference reverse osmosis component is located on the side of a non-aeration ultrafiltration component. The low-pressure-difference reverse osmosis component is used to perform reverse osmosis filtration on wastewater to achieve drinking-grade pure water.

[0010] Preferably, the flat membrane microfiltration assembly includes:

[0011] A primary buffer tank, wherein a water inlet is provided on the side of the primary buffer tank and a control device is installed at the bottom of the primary buffer tank;

[0012] A first enclosure, located on the side of the control device;

[0013] The second chamber is located on the side of the first chamber. Both the second chamber and the top of the first chamber are provided with a primary filter membrane. A metal membrane is provided on the top of the primary filter membrane, and high-pressure nozzles are installed at equal intervals on the top of the metal membrane.

[0014] Preferably, the flat membrane microfiltration assembly further includes:

[0015] A concentrate collection tank, with adjacent concentrate collection tanks respectively connected to the side of adjacent metal membranes, and the concentrate collection tank is provided with a concentrate outlet;

[0016] The water outlet is located on the side of the second housing.

[0017] Preferably, the aeration-free ultrafiltration component includes:

[0018] An ultrafiltration membrane tank, wherein the bottom of the ultrafiltration membrane tank is conical, and a third chamber is provided inside the ultrafiltration membrane tank, on which an ultrafiltration membrane module is installed;

[0019] An aeration-free control unit is connected to the side of the third housing;

[0020] A backwash water tank, located on the side of the ultrafiltration membrane tank;

[0021] An ultrafiltration permeate pump, wherein the ultrafiltration permeate pump is located on the side of the backwash water tank;

[0022] An ultrafiltration product backwash pump is located on the side of the ultrafiltration product water pump.

[0023] An ultrafiltration dosing tank is located on the side of the ultrafiltration backwash pump, and an ultrafiltration metering pump is installed on the top of the ultrafiltration dosing tank.

[0024] Preferably, the aeration-free ultrafiltration component further includes:

[0025] An RO high-pressure pump is installed above the ultrafiltration dosing tank.

[0026] A high-flow filter is located on the side of the RO high-pressure pump and is connected to the output end of the RO high-pressure pump.

[0027] Preferably, the low-pressure-difference reverse osmosis component includes:

[0028] An RO membrane element, wherein an RO chemical cleaning inlet is provided at the bottom of the RO membrane element;

[0029] An RO circulating pump is installed between adjacent RO membrane elements. The side of the RO circulating pump is provided with an RO membrane module outlet, an RO membrane module concentrate outlet, and an RO chemical cleaning water return.

[0030] Preferred options also include:

[0031] Butterfly valve, which is installed on the flat membrane microfiltration module and the low pressure differential reverse osmosis module;

[0032] A plate and frame filter press, wherein the plate and frame filter press is located below the first housing;

[0033] Pressure gauge, flow meter, ultrafiltration backwash valve and check valve, wherein the pressure gauge, flow meter, ultrafiltration backwash valve and check valve are installed on the non-aeration ultrafiltration module and the low differential pressure reverse osmosis module;

[0034] A manual ball valve is installed on the non-aeration ultrafiltration unit.

[0035] The technical effects and advantages of this utility model are as follows:

[0036] This invention utilizes a combination of flat membrane microfiltration modules, aeration-free ultrafiltration modules, and low-pressure-difference reverse osmosis modules to achieve high-flux, low-cost, and short-process membrane treatment in the pretreatment and reclaimed water sections. The coal powder retained by the membrane filtration can be combined with membrane concentration to replace sludge concentration. The pretreatment section employs pressureless filtration and no reagents to reduce energy consumption and promote energy conservation and environmental protection. Simultaneously, the ultrafiltration system eliminates the need for aeration and flushing, saving energy. The filtration precision of the membrane can be selected according to operating conditions. The system consumes little self-water, has a high recovery rate, and provides a clear and efficient filtration effect. This results in a short process flow, space saving, low investment and operating costs, modular assembly, and a short construction period, making maintenance convenient. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the ultra-low consumption direct filtration process of this utility model.

[0038] Figure 2 This is a schematic diagram of the structure of the primary buffer water tank of this utility model.

[0039] Figure 3 This is a schematic diagram of the structure of the concentrated liquid collection tank of this utility model.

[0040] Figure 4 This is a schematic diagram of the backwash water tank of this utility model.

[0041] Figure 5 This is a schematic diagram of the RO membrane element of this utility model.

[0042] Figure 6 This is a schematic diagram comparing the processes of this utility model.

[0043] In the diagram: 1. Flat membrane microfiltration module; 11. Inlet; 12. Primary buffer tank; 13. Control equipment; 14. First chamber; 15. Metal membrane; 16. High-pressure nozzle; 17. Primary filter membrane; 18. Second chamber; 19. Concentrate collection tank; 110. Concentrate outlet; 2. Non-aeration ultrafiltration module; 21. Ultrafiltration membrane tank; 22. Third chamber; 23. Ultrafiltration membrane module; 24. Non-aeration control unit; 25. Backwash tank; 26. Ultrafiltration permeate pump; 27. Ultrafiltration permeate pump. 28. RO high-pressure pump; 29. ​​High-flow filter; 210. Ultrafiltration dosing tank; 211. Ultrafiltration metering pump; 3. Low differential pressure reverse osmosis module; 31. RO chemical cleaning inlet; 32. RO membrane element; 33. RO circulation pump; 34. RO membrane module concentrate outlet; 35. RO chemical cleaning water return; 36. RO membrane module outlet; 4. Butterfly valve; 5. Plate and frame filter press; 6. Pressure gauge; 7. Flow meter; 8. Ultrafiltration backwash valve; 9. Check valve; 10. Manual ball valve. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] This utility model provides, for example Figure 1-6The illustrated ultra-low-consumption direct filtration system includes a flat membrane microfiltration module 1, an aeration-free ultrafiltration module 2, and a low-pressure-difference reverse osmosis module 3. The flat membrane microfiltration module 1 has a filtration accuracy of 50 micrometers and utilizes the principle of natural gravity. Wastewater flows onto the surface of the flat membrane, and the water naturally passes through a metal membrane 15. Under pressureless conditions, the metal membrane 15 separates suspended solids from the water in the wastewater. A cleaning nozzle above the flat membrane moves along a track with the traveling mechanism to clean the suspended solids and the flat membrane. The flat membrane microfiltration can replace the function of a sedimentation tank, achieving instantaneous and rapid solid-liquid separation. The permeate from the flat membrane microfiltration enters the aeration-free ultrafiltration module 2, which has a filtration accuracy of 0.1 micrometers. Through mechanical reciprocating motion, it alleviates membrane fouling and achieves secondary rapid solid-liquid separation. The separation effect is achieved through the conical bottom design of the ultrafiltration membrane tank 21, which enables sludge concentration. The membrane tank is periodically emptied, and the permeate from the non-aeration ultrafiltration module 2 enters the low-pressure difference reverse osmosis module 3. The low-pressure difference reverse osmosis module 3 has a filtration accuracy of 0.0001 microns. The low-pressure difference reverse osmosis module 3 can achieve drinking-grade pure water through membrane filtration, meeting the water quality standards for reuse. The flat membrane microfiltration module 1 is used to separate suspended solids from the water phase in the wastewater. The non-aeration ultrafiltration module 2 is located on the side of the flat membrane microfiltration module 1. The non-aeration ultrafiltration module 2 is used to further separate solids and liquids and alleviate membrane fouling. The low-pressure difference reverse osmosis module 3 is located on the side of the non-aeration ultrafiltration module 2. The low-pressure difference reverse osmosis module 3 is used to perform reverse osmosis filtration on the wastewater to achieve drinking-grade pure water.

[0046] Specifically, the flat membrane microfiltration assembly 1 includes a primary buffer tank 12, a first housing 14, and a second housing 18. A high-suspended solids inlet is provided between the primary buffer tank 12 and the inlet 11. The inlet 11 is located on the side of the primary buffer tank 12, which facilitates the entry of wastewater into the filter. The primary buffer tank 12 helps to buffer and protect the wastewater from entering. The first housing 14 facilitates the collection of the separated water. The metal membrane 15 facilitates the separation of suspended solids in the wastewater from the water phase. A control device 13 is installed at the bottom of the primary buffer tank 12. The first housing 14 is located on the side of the control device 13. The second housing 18 is located on the side of the first housing 14. A primary filter membrane 17 is installed on the top of both the second housing 18 and the first housing 14. A metal membrane 15 is installed on the top of the primary filter membrane 17. High-pressure nozzles 16 are installed at equal intervals on the top of the metal membrane 15. The high-pressure nozzles 16 are used in conjunction with a walking mechanism and a track, so that the flat membrane can be moved to rinse and clean.

[0047] More specifically, the flat membrane microfiltration assembly 1 also includes a concentrate collection tank 19 and an outlet end, which facilitates the collection of concentrate filtered by the metal membrane 15. Adjacent concentrate collection tanks 19 are respectively connected to the side of adjacent metal membranes 15. The concentrate collection tank 19 is provided with a concentrate outlet 110, which facilitates the discharge of concentrate and allows the concentrate to enter the next step. The outlet end is located on the side of the second tank 18.

[0048] Specifically, the aeration-free ultrafiltration module 2 includes an ultrafiltration membrane tank 21, an aeration-free control unit 24, a backwash water tank 25, an ultrafiltration permeate pump 26, an ultrafiltration permeate backwash pump 27, and an ultrafiltration dosing water tank 210. The ultrafiltration membrane tank 21 facilitates sludge concentration and wastewater re-filtration. The backwash water tank 25 facilitates backwashing operations. The ultrafiltration permeate pump 26 facilitates the extraction of filtered water from the third tank 22. The bottom of the ultrafiltration membrane tank 21 is conical. The interior of the 21 is provided with a third chamber 22, on which an ultrafiltration membrane module 23 is installed. An aeration control unit 24 is connected to the side of the third chamber 22. A backwash water tank 25 is located on the side of the ultrafiltration membrane tank 21. An ultrafiltration permeate pump 26 is located on the side of the backwash water tank 25. An ultrafiltration permeate backwash pump 27 is located on the side of the ultrafiltration permeate pump 26. An ultrafiltration dosing water tank 210 is located on the side of the ultrafiltration permeate backwash pump 27. An ultrafiltration metering pump 211 is installed on the top of the ultrafiltration dosing water tank 210.

[0049] More specifically, the non-aeration ultrafiltration module 2 also includes an RO high-pressure pump 28 and a high-flow filter 29. The RO high-pressure pump 28 facilitates the high-pressure pumping of sewage into the low-pressure differential reverse osmosis module 3 for final treatment. The RO high-pressure pump 28 is located above the ultrafiltration dosing tank 210, and the high-flow filter 29 is located on the side of the RO high-pressure pump 28. The high-flow filter 29 is connected to the output end of the RO high-pressure pump 28.

[0050] Furthermore, the low-pressure differential reverse osmosis module 3 includes an RO membrane element 32 and an RO circulation pump 33. The RO membrane element 32 is divided into primary and secondary stages, such as... Figure 5 As shown, the RO membrane element 32 on the left is the primary stage, and the one on the right is the secondary stage. The RO membrane element 32 is conducive to filtering wastewater and making it meet the standards for recycled water. The RO chemical cleaning inlet 31 is provided below the RO membrane element 32. The RO circulation pump 33 is installed between adjacent RO membrane elements 32. The side of the RO circulation pump 33 is provided with the RO membrane assembly outlet 36, the RO membrane assembly concentrate outlet 34, and the RO chemical cleaning water return 35 in sequence.

[0051] Furthermore, it also includes butterfly valve 4, plate and frame filter press 5, pressure gauge 6, flow meter 7, ultrafiltration backwash valve 8, check valve 9, and manual ball valve 10. Plate and frame filter press 5 is beneficial for filtration and dewatering of pulverized coal. The installation positions of butterfly valve 4, pressure gauge 6, flow meter 7, ultrafiltration backwash valve 8, check valve 9, and manual ball valve 10 are as follows... Figure 1-5 As shown, butterfly valve 4 is installed on flat membrane microfiltration module 1 and low pressure differential reverse osmosis module 3, plate and frame filter press 5 is located below the first chamber 14, pressure gauge 6, flow meter 7, ultrafiltration backwash valve 8 and check valve 9 are installed on non-aeration ultrafiltration module 2 and low pressure differential reverse osmosis module 3, and manual ball valve 10 is installed on non-aeration ultrafiltration module 2.

[0052] like Figure 6 As shown, compared with traditional processes, this process adopts a prefabricated design and supply, eliminating the need for a reinforced concrete tank, resulting in a faster construction cycle and less land occupation. It eliminates the need for chemical dosing, utilizing the forced retention of membranes for rapid and efficient filtration. This process employs a non-aeration ultrafiltration system, saving over 90% in energy consumption. It features a shorter process chain and stronger resistance to shock loads. This process eliminates intermediate tanks and reduces the need for primary pump boosting. Utilizing the automated control of the non-aeration ultrafiltration system and reverse osmosis system, it achieves land saving, energy saving, and investment saving. The non-aeration ultrafiltration system features a conical bottom design, integrating membrane filtration and membrane concentration functions into one unit, replacing sludge conditioning tanks and sludge thickening tanks, achieving land saving, reduced operating and chemical consumption, and sludge reduction.

[0053] When coal mine wastewater needs treatment, the mine water enters the primary filtration (coarse filtration) metal membrane 15. Larger suspended particles such as coal slime and coal powder are isolated on the filter surface and discharged through the drain outlet. The filtered water then enters the primary buffer tank 12 of the flat membrane microfiltration (fine filtration) and overflows evenly through the high suspended solids inlet filter. The suspended solids from the coal slime and coal powder are trapped on the high suspended solids inlet surface, cleaned by the primary buffer tank 12, and collected at the concentrated liquid outlet 110 of the coal slime and coal powder concentrate collector. It then merges with the wastewater discharge from the primary filtration and cleans the suspended solids on the membrane surface through the high-pressure nozzle 16. Depending on the actual situation, it can be directly sent to the sludge tank for treatment. The filtered water falls into the lower water tank outlet and enters the ultrafiltration membrane tank 21. Under the action of the non-aeration control unit 24, the mixed liquid passes through the ultrafiltration membrane module. 23. Solid-liquid separation is performed using the ultrafiltration permeate pump 26. The coal powder produced by the membrane tank concentration is discharged to the plate and frame filter press 5 for treatment through the butterfly valve 4. The non-aeration ultrafiltration system performs backwashing and chemical washing on the ultrafiltration membrane module 23 through the control system. The ultrafiltration permeate backwash pump 27 and the ultrafiltration backwash valve 8 are opened to take water from the backwash water tank 25 to perform physical backwashing on the ultrafiltration membrane module 23. The ultrafiltration metering pump 211 is opened to take chemicals from the ultrafiltration chemical dosing tank 210 and inject them into the pipeline for chemical cleaning. The water from the non-aeration ultrafiltration system is sent to the RO high-pressure pump 28, and then through the first-stage RO membrane element 32. The purified water is sent to the RO membrane group outlet 36. The concentrate produced by the first-stage RO membrane element 32 is sent to the second-stage RO membrane element 32. The purified water is sent to the RO membrane group outlet 36, and the concentrate is sent to the RO membrane group concentrate outlet 34. The recovery rate of the RO system is controlled by adjusting the butterfly valve 4.

[0054] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ultra-low consumption direct filtration system, characterized in that, It comprises: A flat membrane microfiltration assembly (1) for separating suspended solids from water in sewage; An air-free ultrafiltration assembly (2) located on the side of the flat membrane microfiltration assembly (1), which is used for re-separation of solid-liquid and alleviation of membrane pollution; A low-pressure differential reverse osmosis assembly (3) located on the side of the air-free ultrafiltration assembly (2), which is used for reverse osmosis filtration of sewage to achieve drinking water.

2. An ultra-low wash water direct filtration system according to claim 1, wherein, The flat membrane microfiltration assembly (1) comprises: A first buffer tank (12) provided with a water inlet (11) on the side, and a control device (13) installed at the bottom; A first tank (14) located on the side of the control device (13); A second tank (18) located on the side of the first tank (14), and a first filter membrane (17) provided on the top of the second tank (18) and the first tank (14), and a metal membrane (15) provided on the top of the first filter membrane (17), and a high-pressure nozzle (16) installed equidistantly on the top of the metal membrane (15).

3. An ultra-low wash water direct filtration system according to claim 2, wherein, The flat membrane microfiltration assembly (1) further comprises: A concentrated liquid collection tank (19) connected to the side of the adjacent metal membrane (15), and provided with a concentrated liquid outlet (110) on the tank; A water outlet provided on the side of the second tank (18).

4. An ultra-low wash water direct filtration system according to claim 1, wherein The air-free ultrafiltration assembly (2) comprises: An ultrafiltration membrane pool (21) with a tapered bottom, and a third tank (22) provided inside the ultrafiltration membrane pool (21), and an ultrafiltration membrane assembly (23) installed on the third tank (22); An air-free control unit (24) connected to the side of the third tank (22); A backwash water tank (25) located on the side of the ultrafiltration membrane pool (21); An ultrafiltration water production pump (26) located on the side of the backwash water tank (25); An ultrafiltration backwash pump (27) provided on the side of the ultrafiltration water production pump (26); An ultrafiltration dosing water tank (210) located on the side of the ultrafiltration backwash pump (27), and an ultrafiltration metering pump (211) installed on the top of the ultrafiltration dosing water tank (210).

5. An ultra-low wash water direct filtration system according to claim 4, wherein, The air-free ultrafiltration assembly (2) further comprises: An RO high-pressure pump (28) provided above the ultrafiltration dosing water tank (210); A large-flux filter (29) located on the side of the RO high-pressure pump (28), and connected to the output end of the RO high-pressure pump (28).

6. An ultra-low wash water direct filtration system according to claim 1, wherein The low-pressure differential reverse osmosis assembly (3) comprises: RO membrane element (32), below which is provided with RO chemical cleaning inlet (31); RO circulating pump (33) is installed between adjacent RO membrane element (32), the side of RO circulating pump (33) is provided with RO membrane group water outlet (36), RO membrane group concentrated water outlet (34) and RO chemical cleaning water return (35) in turn.

7. An ultra-low wash water direct filtration system according to claim 1, wherein Also includes: Butterfly valve (4) is installed on flat membrane microfiltration assembly (1) and low pressure difference reverse osmosis assembly (3); Plate and frame filter press (5) is located below the first tank (14); Pressure gauge (6), flowmeter (7), ultrafiltration backwash valve (8) and check valve (9) are installed on the non-aeration ultrafiltration assembly (2) and low pressure difference reverse osmosis assembly (3); Manual ball valve (10) is installed on the non-aeration ultrafiltration assembly (2).

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