An apparatus for slowing the rate of deposition of suspended solids in mine wastewater at the interface of a microporous membrane

Abstract

The utility model discloses a device for slowing down the deposition rate of suspended matter in mine wastewater at the interface of microporous membrane, which comprises a membrane cell unit, a water inlet unit, a water outlet unit, an aeration unit and a sludge discharge unit. The membrane cell unit comprises a membrane cell and a membrane assembly. The membrane assembly comprises a membrane assembly water outlet pipe and a microporous membrane. The membrane assembly water outlet pipe is arranged in parallel. The aeration unit comprises an aeration pump and an aeration pipe which are connected in communication. The aeration pipe extends into the membrane cell and is located between the microporous membranes. The membrane assembly water outlet pipe is in communication with the water outlet unit. The device for slowing down the deposition rate of suspended matter in mine wastewater at the interface of microporous membrane is proposed. By analyzing the pore size and pore density distribution characteristics of the microporous membrane interface and combining the form of the suspended matter in the mine wastewater and the membrane pore embedding behavior, the aeration pipe is directly inserted between the membrane filaments to realize near-membrane aeration, enhance the disturbance of the membrane filaments and effectively inhibit the deposition of the suspended matter on the membrane surface.

Description

Technical Field

[0001] This utility model relates to the field of microporous membrane pollution control technology, specifically to a device for slowing down the deposition rate of suspended solids in mine wastewater at the microporous membrane interface. Background Technology

[0002] Coal is an important energy source for my country's socio-economic development, but the large amounts of mine wastewater generated during its mining process, if directly discharged, will seriously pollute the surrounding soil, water bodies, and ecosystems, and waste water resources. Therefore, adopting appropriate water treatment technologies to purify mine wastewater is a key link in achieving ecological environmental protection and water resource recycling.

[0003] Mine wastewater can be classified into acidic wastewater, high suspended solids wastewater, and high mineralization wastewater based on its water quality. Among these, high suspended solids wastewater is most widely distributed in mining areas of northern my country, and its suspended solids mainly consist of fine coal dust and rock dust, with a concentration typically ranging from 2000 to 5000 mg / L. In recent years, microfiltration microporous membrane separation technology has become the core process for treating this type of wastewater due to its advantages such as stable effluent, simple operation, compact footprint, and low energy consumption. However, during operation, high concentrations of suspended solids easily deposit on the membrane surface, causing serious membrane fouling, which has become a major bottleneck restricting the efficient application of this technology.

[0004] Unlike traditional organic pollutants, suspended solids in mine wastewater are mainly small-sized inorganic coal dust particles, which primarily cause microporous membrane performance degradation through physical clogging. Existing physical, chemical, biological, and high-speed shear cleaning methods are all ineffective in controlling this type of membrane fouling. Therefore, developing targeted suspended solids deposition control technologies on the membrane surface based on the physicochemical properties of coal slime particles and membrane fouling mechanisms is key to promoting the widespread application of microporous membrane technology in mine wastewater treatment. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a device to slow down the deposition rate of suspended solids in mine wastewater at the microporous membrane interface, and to solve the problem of membrane fouling that easily occurs in the process of treating mine wastewater with microporous membranes in the existing technology.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a device for reducing the deposition rate of suspended solids in mine wastewater at the microporous membrane interface, comprising a membrane tank unit, an inlet unit connected to the membrane tank unit, an outlet unit connected to the membrane tank unit, an aeration unit connected to the membrane tank unit, and a sludge discharge unit connected to the membrane tank unit. The membrane tank unit includes a membrane tank and at least two membrane modules installed in the membrane tank. The membrane module includes a membrane module outlet pipe and a microporous membrane installed on the membrane module outlet pipe.

[0007] The membrane module's outlet pipes are arranged in parallel.

[0008] The aeration unit includes an aeration pump and an aeration pipe connected in series. The aeration pipe extends into the membrane tank and is located between the microporous membranes.

[0009] The membrane module's outlet pipe is connected to the outlet unit.

[0010] This utility model also has the following technical features:

[0011] The aeration pipe includes a main aeration pipe and a branch aeration pipe connected together. The main aeration pipe is arranged parallel to the bottom of the membrane tank, and the branch aeration pipe is arranged perpendicular to the main aeration pipe.

[0012] The aeration branch pipe has aeration holes evenly distributed on its wall, and the aeration branch pipe extends into the microporous membrane, with the aeration direction of the aeration branch pipe perpendicular to the microporous membrane.

[0013] The aeration main pipe is connected to the aeration pump.

[0014] The water inlet unit includes a water inlet pipe, a water inlet pump installed on the water inlet pipe, and a water inlet flow meter installed on the water inlet pipe, wherein the water inlet pipe is connected to the membrane tank.

[0015] The water outlet unit includes a water outlet pipe that is connected to the water outlet pipe, a water outlet pump installed on the water outlet pipe, a water outlet flow meter installed on the water outlet pipe, and a pressure gauge installed on the water outlet pipe.

[0016] The water outlet pipe is connected to the water outlet pipe of the membrane assembly.

[0017] The sludge discharge unit includes a sludge discharge pipe and a sludge collection tank that are connected together.

[0018] The sludge discharge pipe is connected to the membrane tank.

[0019] A gas flow meter is also installed on the aeration main pipe.

[0020] The height of the aeration branch pipe is consistent with the effective filtration length of the microporous membrane.

[0021] Compared with the prior art, this utility model has the following technical effects:

[0022] (I) The present invention proposes a device to reduce the deposition rate of suspended solids in mine wastewater at the microporous membrane interface. By analyzing the pore size and pore density distribution characteristics of the microporous membrane interface, and combining the morphology of suspended solids in mine wastewater and the membrane pore embedding behavior, the aeration pipe is directly inserted between the membrane fibers to achieve near-membrane aeration, enhance membrane fiber disturbance, and effectively inhibit the deposition of suspended solids on the membrane surface.

[0023] (II) The present invention proposes a device to reduce the deposition rate of suspended solids in mine wastewater at the microporous membrane interface. The aeration airflow perpendicular to the membrane surface generates shear stress, which can drag and remove coal powder particles that clog the membrane pores, thereby further reducing the deposition rate of suspended solids at the microporous membrane interface.

[0024] (III) The device proposed in this utility model for reducing the deposition rate of suspended solids in mine wastewater at the microporous membrane interface is simple in structure, easy to operate, safe and reliable, and highly adaptable. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the device for reducing the deposition rate of suspended solids in mine wastewater at the microporous membrane interface according to this utility model.

[0026] Figure 2 This is a schematic diagram of the aeration pipe of this utility model.

[0027] Figure 3 This is a comparison chart showing the processing results.

[0028] The meanings of the labels in the attached diagram are as follows:

[0029] 1-Membrane tank unit, 2-Inlet water unit, 3-Outlet water unit, 4-Aeration unit, 5-Sludge removal unit, 6-Mine wastewater collection tank, 7-Outlet water tank.

[0030] 1-1-Membrane pool, 1-2-Membrane module.

[0031] 2-1-Inlet pipe, 2-2-Inlet pump, 2-3-Inlet flow meter.

[0032] 3-1-Outlet pipe, 3-2-Outlet pump, 3-3-Outlet flow meter, 3-4-Pressure gauge.

[0033] 4-1-Aeration pump, 4-2-Aeration pipe, 4-3-Gas flow meter.

[0034] 5-1-Sludge discharge pipe, 5-2-Sludge collection tank.

[0035] 1-2-1-Water outlet pipe of membrane module, 1-2-2-Microporous membrane.

[0036] 4-2-1-Aeration main pipe, 4-2-2-Aeration branch pipe.

[0037] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0038] Unless otherwise specified, all components in this invention are made from components known in the prior art.

[0039] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0040] Example 1:

[0041] This embodiment provides a device for slowing down the deposition rate of suspended solids in mine wastewater at the microporous membrane interface, such as... Figures 1-2 As shown, it includes a membrane tank unit 1, an inlet unit 2 connected to the membrane tank unit 1, an outlet unit 3 connected to the membrane tank unit 1, an aeration unit 4 connected to the membrane tank unit 1, and a sludge removal unit 5 connected to the membrane tank unit 1. The membrane tank unit 1 includes a membrane tank 1-1 and at least two membrane modules 1-2 installed in the membrane tank 1-1. The membrane module 1-2 includes a membrane module outlet pipe 1-2-1 and a microporous membrane 1-2-2 installed on the membrane module outlet pipe 1-2-1.

[0042] The membrane module outlet pipes 1-2-1 are arranged in parallel.

[0043] The aeration unit 4 includes an aeration pump 4-1 and an aeration pipe 4-2 connected together. The aeration pipe 4-2 extends into the membrane tank 1-1 and is located between the microporous membranes 1-2-2.

[0044] The membrane module outlet pipe 1-2-1 is connected to the outlet unit 3.

[0045] This embodiment analyzes the pore size and pore density distribution characteristics of the microporous membrane interface, and combines the morphology of suspended solids in mine wastewater and the membrane pore embedding behavior. The aeration pipe 4-2 is directly inserted between the microporous membranes 1-2-2 to achieve near-membrane aeration, enhance the membrane filament disturbance between the microporous membranes 1-2-2, and effectively suppress the deposition of suspended solids on the membrane surface between the microporous membranes 1-2-2.

[0046] As a preferred embodiment:

[0047] The aeration pipe 4-2 includes a main aeration pipe 4-2-1 and an aeration branch pipe 4-2-2 connected together. The main aeration pipe 4-2-1 is arranged parallel to the bottom of the membrane tank 1-1, and the aeration branch pipe 4-2-2 is arranged perpendicular to the main aeration pipe 4-2-1.

[0048] The aeration branch pipe 4-2-2 has aeration holes evenly distributed on its wall. The aeration branch pipe 4-2-2 extends into the microporous membrane 1-2-2, and the aeration direction of the aeration branch pipe 4-2-2 is perpendicular to the microporous membrane 1-2-2.

[0049] The aeration main pipe 4-2-1 is connected to the aeration pump 4-1.

[0050] The aeration airflow perpendicular to the membrane surface generates shear stress, which can drag away coal powder particles clogging the membrane pores and further reduce the deposition rate of suspended matter at the microporous membrane interface.

[0051] In this embodiment, the device aerates in a direction perpendicular to the microporous membrane 1-2-2, thereby increasing the disturbance intensity of the microporous membrane 1-2-2 and effectively reducing the deposition of suspended solids in mine wastewater on the surface of the microporous membrane 1-2-2.

[0052] As a preferred embodiment:

[0053] The water inlet unit 2 includes a water inlet pipe 2-1 connected in series, a water inlet pump 2-2 installed on the water inlet pipe 2-1, and a water inlet flow meter 2-3 installed on the water inlet pipe 2-1. The water inlet pipe 2-1 is connected to the mine wastewater collection tank 6 and the membrane tank 1-1.

[0054] As a preferred embodiment:

[0055] The water outlet unit 3 includes a water outlet pipe 3-1 connected in series, a water outlet pump 3-2 installed on the water outlet pipe 3-1, a water outlet flow meter 3-3 installed on the water outlet pipe 3-1, and a pressure gauge 3-4 installed on the water outlet pipe 3-1.

[0056] The water outlet pipe 3-1 connects the water outlet pool 7 and the membrane module water outlet pipe 1-2-1.

[0057] As a preferred embodiment:

[0058] The sludge discharge unit 5 includes a sludge discharge pipe 5-1 and a sludge collection tank 5-2 connected together.

[0059] The sludge discharge pipe 5-1 is connected to the membrane tank 1-1.

[0060] A sludge discharge port is provided on the lower side of membrane tank 1-1, and the accumulated sludge in membrane tank 1-1 is periodically discharged to sludge collection tank 5-2 through sludge discharge pipe 5-1.

[0061] As a preferred embodiment:

[0062] A gas flow meter 4-3 is also installed on the aeration main pipe 4-2-1.

[0063] The height of the aeration branch pipe 4-2-2 is consistent with the effective filtration length of the microporous membrane 1-2-2.

[0064] The specific working process of this utility model:

[0065] In this embodiment, the microporous membrane 1-2-2 is a 0.1μm polytetrafluoroethylene curtain membrane module, installed on... Figure 1In the system shown, the target material for treatment is mine wastewater with a suspended solids concentration of 5000 mg / L, and the effluent flow rate is 25 L·m³. -2 ·h -1 The system was continuously operated under both aeration (0.8 L / min) and non-aeration conditions. Operation was stopped when the transmembrane pressure difference reached 40 kPa. Results are shown below. Figure 3 .

[0066] like Figure 3 As shown, under the same microporous membrane and mine wastewater conditions, when the transmembrane pressure difference reaches the critical value, the aeration operation time is as long as 57.07 hours, while the non-aeration operation time is only 13.4 hours. The device extends the operation time by 325.89%, effectively slowing down the deposition rate of suspended solids on the microporous membrane surface in mine wastewater.

[0067] The above technical solutions are only preferred embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be conceived by those skilled in the art without creative effort within the technical scope disclosed in this utility model are covered within the protection scope of this utility model.

Claims

1. A device for slowing down the deposition rate of suspended solids in mine wastewater at the interface of a microporous membrane, comprising a membrane cell unit (1), a water inlet unit (2) in communication with the membrane cell unit (1), a water outlet unit (3) in communication with the membrane cell unit (1), an aeration unit (4) in communication with the membrane cell unit (1), and a sludge discharge unit (5) in communication with the membrane cell unit (1), characterized in that, The membrane tank unit (1) includes a membrane tank (1-1) and at least two membrane modules (1-2) installed in the membrane tank (1-1). The membrane module (1-2) includes a membrane module outlet pipe (1-2-1) and a microporous membrane (1-2-2) installed on the membrane module outlet pipe (1-2-1). The membrane module outlet pipes (1-2-1) are arranged in parallel; The aeration unit (4) includes an aeration pump (4-1) and an aeration pipe (4-2) connected in series. The aeration pipe (4-2) extends into the membrane tank (1-1) and is located between the microporous membranes (1-2-2). The membrane module outlet pipe (1-2-1) is connected to the outlet unit (3).

2. The device for reducing the deposition rate of suspended solids in mine wastewater at the microporous membrane interface as described in claim 1, characterized in that, The aeration pipe (4-2) includes an aeration main pipe (4-2-1) and an aeration branch pipe (4-2-2) connected together. The aeration main pipe (4-2-1) is arranged parallel to the bottom of the membrane tank (1-1), and the aeration branch pipe (4-2-2) is arranged perpendicular to the aeration main pipe (4-2-1). The aeration branch pipe (4-2-2) has aeration holes evenly distributed on its wall. The aeration branch pipe (4-2-2) extends into the microporous membrane (1-2-2), and the aeration direction of the aeration branch pipe (4-2-2) is perpendicular to the microporous membrane (1-2-2). The aeration main pipe (4-2-1) is connected to the aeration pump (4-1).

3. The device for reducing the deposition rate of suspended solids in mine wastewater at the microporous membrane interface as described in claim 1, characterized in that, The water inlet unit (2) includes a water inlet pipe (2-1) connected in series, a water inlet pump (2-2) installed on the water inlet pipe (2-1) and a water inlet flow meter (2-3) installed on the water inlet pipe (2-1). The water inlet pipe (2-1) is connected to the membrane tank (1-1).

4. The device for reducing the deposition rate of suspended solids in mine wastewater at the microporous membrane interface as described in claim 1, characterized in that, The water outlet unit (3) includes a water outlet pipe (3-1) connected in series, a water outlet pump (3-2) installed on the water outlet pipe (3-1), a water outlet flow meter (3-3) installed on the water outlet pipe (3-1), and a pressure gauge (3-4) installed on the water outlet pipe (3-1); The water outlet pipe (3-1) is connected to the water outlet pipe (1-2-1) of the membrane assembly.

5. The device for reducing the deposition rate of suspended solids in mine wastewater at the microporous membrane interface as described in claim 1, characterized in that, The sludge discharge unit (5) includes a sludge discharge pipe (5-1) and a sludge collection tank (5-2) connected together; The sludge discharge pipe (5-1) is connected to the membrane tank (1-1).

6. The apparatus for reducing the deposition rate of suspended solids in mine wastewater at the microporous membrane interface as described in claim 2, characterized in that, A gas flow meter (4-3) is also installed on the aeration main pipe (4-2-1); The height of the aeration branch pipe (4-2-2) is consistent with the effective filtration length of the microporous membrane (1-2-2).

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