A device for rapid determination of the tolerance limit of a microporous membrane to suspended solids in mine wastewater

Abstract

The utility model discloses a kind of quick determination devices of pore membrane to suspended substance tolerance limit in mine wastewater, including simple hollow fiber membrane assembly and test system;Test system includes magnetic stirrer and stirring vessel;Test system includes water outlet unit, and water outlet unit includes water outlet pipe and water outlet pump, water outlet pipe one end is inserted into stirring vessel, and simple hollow fiber membrane assembly is installed in water outlet pipe one end inserted into stirring vessel;Simple hollow fiber membrane assembly includes multiple hollow fiber membrane filaments, and both ends of hollow fiber membrane filament are connected with capillary, and hollow fiber membrane filament is bent into U shape, and capillary is communicated with water outlet pipe.The utility model presents the quick determination device of pore membrane to suspended substance tolerance limit in mine wastewater, adopt simple membrane assembly to cooperate test system, real-time monitoring transmembrane pressure difference change, when transmembrane pressure difference reaches critical value, record running time, combine water outlet flux, suspended substance tolerance limit of pore membrane can be calculated, realize quick determination pore membrane suspended substance tolerance limit.

Description

Technical Field

[0001] This utility model relates to the field of membrane separation treatment of mine wastewater, specifically to a rapid determination device for the tolerance limit of microporous membrane to suspended solids in mine wastewater. Background Technology

[0002] Coal is an important energy source for my country's socio-economic development, but its mining process generates large amounts of mine wastewater. This wastewater contains high concentrations of pollutants such as coal dust, dissolved organic matter, inorganic salts, and heavy metals. Direct discharge of such wastewater would severely pollute surrounding soil, water bodies, and ecosystems, and waste water resources. Therefore, employing efficient water treatment technologies to purify mine wastewater, reduce its impact on the ecological environment, and improve water resource recycling rates is of great significance for achieving environmental protection and sustainable development in mining areas.

[0003] In recent years, low-pressure microporous membrane technology has been widely used in mine water treatment due to its advantages such as stable effluent quality, simple operation, small footprint, and low energy consumption. However, mine wastewater usually contains a large amount of suspended solids, mainly coal dust, and the concentration of suspended solids in the influent fluctuates greatly during actual operation. Especially during the bottom cleaning process, the concentration of suspended solids can reach tens of thousands of milligrams per liter, which can easily lead to instantaneous blockage or damage to the microporous membrane, seriously affecting the stable operation of the system and having an adverse impact on production and operation.

[0004] Therefore, clarifying the tolerance limit of microporous membranes to suspended solids in mine wastewater is crucial for ensuring stable process operation and improving treatment efficiency. However, there is currently a lack of effective methods and devices for rapidly determining the tolerance limit of suspended solids in microporous membranes. To address this technological gap, there is an urgent need to develop an efficient and convenient measurement device and method to promote the wider application of microporous membrane technology in mine wastewater treatment. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a rapid determination device for the tolerance limit of microporous membranes to suspended solids in mine wastewater, thus solving the problem of the lack of a device in the existing technology capable of rapidly determining the tolerance limit of microporous membranes to suspended solids.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a rapid determination device for the tolerance limit of microporous membrane to suspended solids in mine wastewater, comprising a simple hollow fiber membrane assembly and a testing system.

[0007] The test system includes a magnetic stirrer and a stirring container mounted on the magnetic stirrer.

[0008] The testing system also includes a water outlet unit, which includes a water outlet pipe and a water outlet pump installed on the water outlet pipe. One end of the water outlet pipe extends into the mixing container, and a simple hollow fiber membrane assembly is installed at the end of the water outlet pipe that extends into the mixing container.

[0009] The simple hollow fiber membrane module includes multiple hollow fiber membrane filaments, both ends of which are connected to capillary tubes. The hollow fiber membrane filaments are bent into a U-shape, and the capillary tubes are connected to the water outlet pipe.

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

[0011] The stirring container is a beaker, and a pressure gauge is installed on the water outlet pipe.

[0012] Compared with the prior art, this utility model has the following technical effects:

[0013] (I) The device for rapid determination of the tolerance limit of microporous membrane to suspended solids in mine wastewater proposed in this utility model adopts a simple hollow fiber membrane module in conjunction with a testing system to monitor the change of transmembrane pressure difference in real time. When the transmembrane pressure difference reaches the critical value, the running time is recorded. Combined with the effluent flux, the tolerance limit of suspended solids of microporous membrane can be calculated, thus realizing the rapid determination of the tolerance limit of suspended solids of microporous membrane.

[0014] (II) The device for rapid determination of the tolerance limit of microporous membrane to suspended solids in mine wastewater proposed in this utility model has a simple structure, is easy to operate, safe and reliable, and highly adaptable. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a device for rapidly determining the tolerance limit of microporous membranes to suspended solids in mine wastewater according to the present invention.

[0016] Figure 2 This is a schematic diagram showing the installation relationship between hollow fiber membrane filaments and capillaries.

[0017] Figure 3 The characteristics of the transmembrane pressure difference and the concentration of suspended solids in the membrane pool of the polytetrafluoroethylene microporous membrane in Example 2 are shown as changes over operating time.

[0018] Figure 4 The characteristics of the transmembrane pressure difference and membrane pool suspended solids concentration in the polyvinylidene fluoride microporous membrane as a function of operating time are shown in Example 3.

[0019] Figure 5 The characteristics of the transmembrane pressure difference and membrane pool suspended solids concentration in the polyethersulfone microporous membrane as a function of operating time are shown in Example 4.

[0020] The meanings of the labels in the attached diagram are as follows:

[0021] 1-Simple hollow fiber membrane module, 2-Testing system.

[0022] 1-1-Hollow fiber membrane filament, 1-2-Capillary.

[0023] 2-1-Magnetic stirrer, 2-2-Stirring container, 2-3-Water outlet unit.

[0024] 2-3-1-Outlet pipe, 2-3-2-Outlet pump, 2-3-3-Pressure gauge.

[0025] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0026] Unless otherwise specified, all components in this invention are made from components known in the prior art.

[0027] 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.

[0028] Example 1:

[0029] This embodiment provides a rapid device for determining the tolerance limit of microporous membranes to suspended solids in mine wastewater, such as... Figures 1-2 As shown, it includes a simple hollow fiber membrane module 1 and a testing system 2.

[0030] The test system 2 includes a magnetic stirrer 2-1 and a stirring container 2-2 placed on the magnetic stirrer 2-1.

[0031] The test system 2 also includes a water outlet unit 2-3, which includes a water outlet pipe 2-3-1 and a water outlet pump 2-3-2 installed on the water outlet pipe 2-3-1. One end of the water outlet pipe 2-3-1 extends into the stirring container 2-2, and a simple hollow fiber membrane assembly 1 is installed at the end of the water outlet pipe 2-3-1 that extends into the stirring container 2-2.

[0032] The simple hollow fiber membrane module 1 includes multiple hollow fiber membrane filaments 1-1, both ends of which are connected to capillary tubes 1-2. The hollow fiber membrane filaments 1-1 are bent into a U-shape, and the capillary tubes 1-2 are connected to the water outlet pipes 2-3-1.

[0033] The simple hollow fiber membrane module 1 avoids the traditional time-consuming injection process. It has a detachable structure, which facilitates quick assembly, replacement of membrane fibers and reuse.

[0034] Based on the device of this invention, the tolerance limit of a microporous membrane to suspended solids in mine wastewater can be rapidly determined by following the steps below:

[0035] (1) Bend several hollow fiber membrane filaments 1-1 into a U-shape, insert a capillary tube 1-2 into each end, the outer diameter of the capillary tube 1-2 is closely matched with the inner diameter of the hollow fiber membrane filament 1-1, and fix it with a clamp to form a membrane module; connect the water outlet end of the membrane module to the water outlet unit 2-3 to construct a microporous membrane filtration circuit.

[0036] (2) Place a large-capacity beaker containing mine wastewater of constant concentration on the magnetic stirrer 2-1 and start the magnetic stirrer 2-1 to keep the suspended matter evenly distributed.

[0037] (3) Immerse the membrane module directly in the mine wastewater in the beaker, start the effluent pump 2-3-2, so that the suspension flows out through the hollow fiber membrane filament 1-1 to the capillary tube 1-2 under capillary action, and monitor the transmembrane pressure difference in real time during the process.

[0038] (4) When the transmembrane pressure difference reaches the critical value, record the running time and calculate the tolerance limit of the microporous membrane to suspended solids in mine wastewater in combination with the effluent flux.

[0039] The tolerance limit of microporous membrane suspensions is calculated using the following formula:

[0040]

[0041]

[0042] As a preferred embodiment:

[0043] The stirring container 2-2 is a beaker, and a pressure gauge 2-3-3 is also installed on the water outlet pipe 2-3-1.

[0044] As a preferred embodiment:

[0045] The magnetic stirrer rotates at 200-500 rpm to maintain a uniform distribution of suspended particles in the beaker.

[0046] During the test, the outflow flux of the membrane module was controlled within the range of 40-80 L·m-2·h-1, and the outflow pump was operated in constant flow mode.

[0047] The hollow fiber membrane material includes, but is not limited to, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), or polyethersulfone (PES).

[0048] Example 2:

[0049] For mines with a suspended solids concentration of 10,000 mg / L as the influent

[0050] (1) Select six polytetrafluoroethylene (PTFE) hollow fiber microporous membrane filaments with a pore size of 0.1 μm, bend them into a U-shaped structure, insert a capillary tube into each end of each membrane filament, the outer diameter of the capillary tube is closely fitted with the inner diameter of the membrane filament, and fix them with clamps to assemble a membrane module.

[0051] (2) Connect the outlet end of the membrane module to the outlet pump and flow meter, and set the outlet flux of the membrane module to 40 L·m -2 ·h -1 Construct a microporous membrane filtration circuit.

[0052] (3) Place a large-capacity beaker containing 3L of mine wastewater with a concentration of 10000mg / L on a magnetic stirrer, start the magnetic stirrer and set the stirring speed to 500rpm to ensure that the suspended particles are evenly distributed during the test.

[0053] (4) The operating time when the transmembrane pressure difference reaches the critical value is 38.7h. Combined with the effluent flux, the suspended solids tolerance limit of the microporous membrane is calculated according to the following formula.

[0054]

[0055] like Figure 3 As shown, the concentration of suspended solids in the membrane tank increases linearly with operating time. When the operating time is 38.7 h, the transmembrane pressure difference of the PTFE microporous membrane reaches the critical value, and the suspended solids tolerance limit of the microporous membrane is approximately 1.3 × 10⁻⁶. 5 mg / L.

[0056] Example 3:

[0057] The mine water intake was prepared with a suspended solids concentration of 2000 mg / L.

[0058] (1) Three polyvinylidene fluoride hollow fiber microporous membranes with a nominal pore size of 0.45 μm are bent to form a U-shaped structure. A capillary tube is inserted into each end of each membrane fiber. The outer diameter of the capillary tube is closely fitted with the inner diameter of the membrane fiber and fixed by clamps to assemble a membrane module.

[0059] (2) Connect the outlet end of the membrane module to the outlet pump and flow meter, and set the outlet flux of the membrane module to 80 L·m -2 ·h -1 Construct a microporous membrane filtration circuit.

[0060] (3) Place a large-capacity beaker containing 5L of mine wastewater with a concentration of 2000mg / L on a magnetic stirrer, start the magnetic stirrer and set the stirring speed to 300rpm to ensure that the suspended particles are evenly distributed during the test.

[0061] (4) The operating time when the transmembrane pressure difference reaches the critical value is 36.06h. Combined with the effluent flux, the suspended solids tolerance limit of the microporous membrane is calculated according to the following formula.

[0062]

[0063] like Figure 4 As shown, the concentration of suspended solids in the membrane tank increases linearly with operating time. When the operating time is 36.06 h, the transmembrane pressure difference of the polyvinylidene fluoride microporous membrane reaches the critical value, and the suspended solids tolerance limit of the microporous membrane is approximately 9.14 × 10⁻⁶. 4 mg / L.

[0064] Example 4:

[0065] The mine water intake was prepared with a suspended solids concentration of 7500 mg / L.

[0066] (1) Five polyvinylidene fluoride hollow fiber microporous membranes with a nominal pore size of 0.2 μm are bent to form a U-shaped structure. A capillary tube is inserted into each end of each membrane fiber. The outer diameter of the capillary tube is closely fitted with the inner diameter of the membrane fiber and fixed by clamps to assemble a membrane module.

[0067] (2) Connect the outlet end of the membrane module to the outlet pump and flow meter, and set the outlet flux of the membrane module to 60 L·m -2 ·h -1 Construct a microporous membrane filtration circuit.

[0068] (3) Place a large-capacity beaker containing 4L of mine wastewater with a concentration of 7500mg / L on a magnetic stirrer, start the magnetic stirrer and set the stirring speed to 400rpm to ensure that the suspended particles are evenly distributed during the test.

[0069] (4) The operating time when the transmembrane pressure difference reaches the critical value is 19.57h. Combined with the effluent flux, the suspended solids tolerance limit of the microporous membrane is calculated according to the following formula.

[0070]

[0071] like Figure 5 As shown, the concentration of suspended solids in the membrane pool increases linearly with operating time. When the operating time is 19.06 h, the transmembrane pressure difference of the polyethersulfone microporous membrane reaches the critical value, and the suspended solids tolerance limit of the microporous membrane is approximately 7.3 × 10⁻⁶. 4 mg / L.

[0072] As can be seen from the above embodiments, the concentration of suspended solids in the membrane tank is linearly positively correlated with the operating time, and the transmembrane pressure difference of the microporous membrane increases synchronously with the increase of suspended solids concentration, showing a significant correlation between the two. This device and method have advantages such as simple operation, high efficiency, and low cost, and have important application value for the stable operation and control of treatment processes in practical engineering.

[0073] 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 rapid determination of the tolerance limit of a microporous membrane to suspended solids in mine wastewater, characterized in that, It includes a simple hollow fiber membrane module (1) and a testing system (2); The test system (2) includes a magnetic stirrer (2-1) and a stirring container (2-2) mounted on the magnetic stirrer (2-1); The test system (2) further includes a water outlet unit (2-3), which includes a water outlet pipe (2-3-1) and a water outlet pump (2-3-2) installed on the water outlet pipe (2-3-1). One end of the water outlet pipe (2-3-1) extends into the stirring container (2-2), and a simple hollow fiber membrane assembly (1) is installed at the end of the water outlet pipe (2-3-1) that extends into the stirring container (2-2). The simple hollow fiber membrane module (1) includes multiple hollow fiber membrane filaments (1-1), both ends of which are connected to capillary tubes (1-2). The hollow fiber membrane filaments (1-1) are bent into a U-shape, and the capillary tubes (1-2) are connected to the water outlet pipe (2-3-1).

2. The device for rapid determination of the tolerance limit of a microporous membrane to suspended matter in mine wastewater according to claim 1, characterized in that, The stirring container (2-2) is a beaker, and a pressure gauge (2-3-3) is also installed on the water outlet pipe (2-3-1).

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