A mine water pre-treatment system, artificial recharge system and method

Abstract

This invention discloses a mine water pretreatment system, an artificial reinjection system, and a method, including a movable base. A sample collector, a data collector, and a mine water collection tank are respectively mounted on the base. A quartz sand column is fixed to the side wall of the base, and the bottom of the quartz sand column is connected to the sample collector. Multiple pressure sensors are mounted on the side wall of the quartz sand column, and all of these sensors are electrically connected to the data collector. By combining the mine water pretreatment system and the artificial reinjection system, feedback is provided to the pretreatment system based on the degree of change in media permeability. The turbidity value is changed by adjusting experimental parameters, thus solving the linkage problem between water quality and the permeability of the reinjection medium. Furthermore, by adjusting the position of the inner plate and controlling the propeller, supplemented by periodic backwashing, the smooth reinjection of mine water with different qualities is effectively achieved, thus solving the technical problem of reinjection blockage in the prior art.

Description

Technical Field

[0001] This invention relates to the field of mine water resource protection and utilization, and specifically to a mine water pretreatment system, an artificial reinjection system, and a method. Background Technology

[0002] Mine water refers to a type of water source that appears in mines due to the disruption of the original stable structure of underground aquifers during coal resource development. It primarily originates from surface infiltration recharge of Quaternary loose strata and groundwater. The main pollutants in mine water are coal dust and rock dust, resulting in water with high suspended solids and high turbidity. The suspended solids typically have a particle size below 50 μm, making them difficult to remove through natural sedimentation.

[0003] First, traditional methods for treating high-turbidity mine water tend to focus on end-of-pipe treatment, mainly using surface and underground treatment methods, which have problems such as complex equipment selection and high treatment costs.

[0004] Secondly, given the conflict between coal mining and water resources in my country, previous researchers proposed the concept of artificial mine water reinjection. Current research focuses on the storage capacity and safety analysis of reinjection formations, with limited attention paid to the difficulties in injection and extraction. The injection capacity of reinjection primarily depends on changes in the permeability of the medium. However, studies have revealed a contradiction between the self-purification effect of artificially reinjected water and the decrease in medium permeability. When mine water exhibits high turbidity, the turbidity removal rate is often high after flowing through the aquifer, but at this point, the permeability of the medium decreases significantly. Achieving low turbidity often requires substantial treatment costs, and the self-purification mechanism of the reinjection process is not fully utilized.

[0005] Finally, there is currently no standardized definition of water quality indicators for artificial mine water reinjection. This is because the requirements for water quality vary greatly depending on the region and rock strata. It is necessary to artificially simulate the current situation of the study area and determine the water quality indicators in advance through indoor experiments. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a mine water pretreatment system, an artificial reinjection system and method to solve the technical problem of reinjection blockage in the existing technology.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A mine water pretreatment system includes a movable base, on which a sample collector, a data collector, and a mine water collection tank are respectively mounted. A quartz sand column is fixed to the side wall of the base, with its bottom connected to the sample collector. Multiple pressure sensors are mounted on the side wall of the quartz sand column, and each of the pressure sensors is electrically connected to the data collector. A coagulation test stirrer is connected to the top of the quartz sand column via a first branch pipe. A metering pump and a dosing system are fixed to the side wall of the base. The metering pump is connected to both the coagulation test stirrer and the mine water collection tank, and the dosing system is connected to the coagulation test stirrer. A first valve is provided between the quartz sand column and the sample collector.

[0009] A second valve, a first rotor flowmeter, and a turbidity meter are sequentially installed on the first branch pipe; a second rotor flowmeter is installed between the metering pump and the mine water collection tank;

[0010] The data acquisition device is connected to an external computer.

[0011] The present invention also includes the following features:

[0012] The base is equipped with casters at its bottom.

[0013] The mine water collection tank is equipped with a magnetic stirrer.

[0014] A pressure sensor is connected to the side wall of the quartz sand column via a flange.

[0015] An artificial reinjection system includes a mine water tank located outside a U-shaped reinjection well and two packing columns (number one and number two) installed on the inner wall of the U-shaped reinjection well. The mine water tank is connected to a mine water collection tank and to the first and second packing columns, respectively. A first reinjection pump and a second reinjection pump are respectively installed between the first and second packing columns and the mine water tank. A first thruster and a second thruster are correspondingly installed on the inner wall of the U-shaped reinjection well at the bottom of the first and second packing columns.

[0016] The U-shaped recharge well has a pair of symmetrical baffles prefabricated on its inner wall. A first inner plate and a second inner plate are installed at the bottom of the pair of baffles. The first inner plate and the second inner plate are respectively located between the first packing column and the first thruster, and between the second packing column and the second thruster. A first motor and a second motor are respectively connected to the first inner plate and the second inner plate.

[0017] A clean water tank is installed outside the U-shaped recharge well. The clean water tank is connected to the inside of the U-shaped recharge well. A first clean water pump and a second clean water pump are installed between the clean water tank and the U-shaped recharge well.

[0018] The inner wall of the U-shaped recharge well is pre-filled with gravel, coarse sand, fine sand, artificial zeolite, and CaCl2 of different particle sizes.

[0019] A method for artificial reinjection of mine water, based on the mine water pretreatment system and the artificial reinjection system, specifically includes the following steps:

[0020] Step 1: Determine the water quality of the mine water in the mine water collection tank. If it is mine water containing suspended solids, proceed to Step 2; if it is mine water containing organic matter, proceed to Step 3; if it is mine water with hardness, proceed to Step 4; if it is clean mine water, proceed to Step 5.

[0021] Step two specifically includes the following steps:

[0022] Step 2.1: Open the first valve and the second valve to transport the mine water in the data acquisition unit to the dosing system, and use a turbidity meter to test the turbidity of the mine water to obtain the water turbidity as a NTU, a > 0;

[0023] Step 2.2: Construct the PAC fitting formula b = 40.42In(x) - 120.82, the PAM fitting formula c = 0.32In(x) - 1.14, and the backwash cycle fitting formula t = -69.74In(x) + 529.94;

[0024] in:

[0025] x represents the turbidity of the water;

[0026] b represents the dosage of polyaluminum chloride;

[0027] c represents the dosage of polyacrylamide;

[0028] t backwash cycle;

[0029] Step 2.3: Input the water turbidity obtained in Step 2.1 into the PAC fitting formula b = 40.42In(x) - 120.82, the PAM fitting formula c = 0.32In(x) - 1.14, and the backwash cycle fitting formula t = -69.74In(x) + 529.94 obtained in Step 2.2 to obtain b, c, and t. Then, add b mg / L polyaluminum chloride and c mg / L polyacrylamide to the dosing system, respectively.

[0030] Step 2.4: Adjust the speed of the coagulation test stirrer, stir at 150 rpm for 3 minutes, then stir at 50 rpm for 10 minutes, and let stand for 15 minutes.

[0031] Step 2.5: Use a turbidity monitor to detect whether the turbidity meets the standard. If yes, proceed to step 2.6. Otherwise, adjust the dosage of polyaluminum chloride and polyacrylamide and the hydraulic conditions respectively. Add flocculant to the coagulation test mixer to destabilize and coagulate colloidal particles, so that the particles with a particle size of less than 50 μm are coagulated into suspended matter with a particle size of more than 300 μm and then settle.

[0032] The hydraulic condition is the flow velocity;

[0033] Step 2.6: Turn on the No. 1 and No. 2 reinjection pumps to transport the supernatant in the mine water collection tank to the No. 1 and No. 2 packing columns;

[0034] Step 2.7: When the recharge reaches the first preset time, turn off the No. 1 and No. 2 recharge water pumps by opening and closing them, and at the same time turn on the No. 1 and No. 2 clean water pumps at a flow rate of 2000ml / min to perform backwashing for t seconds; then continue the recharge process.

[0035] Step 2.8: When the reinjection reaches the second preset time, turn off the No. 1 and No. 2 reinjection pumps, turn on the No. 1 and No. 2 motors, and move the No. 1 inner plate and No. 2 inner plate radially inward until they contact each other; start the No. 1 and No. 2 thrusters to push the No. 1 and No. 2 packing columns back out of the wellhead, remove them from the wellhead, flush them, and reuse them.

[0036] Step three specifically includes the following steps:

[0037] Step 3.1: Open the first valve and the second valve to transport the mine water in the data acquisition unit to the dosing system. Use a TOC analyzer to test the TOC of the mine water and obtain a1 mg / L.

[0038] Step 3.2: Construct the PAC fitting formula b1=0.34In(y)-1.01, the PAM fitting formula c1=0.01n(y)-0.01, and the backwash cycle fitting formula t1=-0.58In(y)+4.42;

[0039] in:

[0040] y represents the total organic matter (TOC) of the water body;

[0041] b1 represents the dosage of polyaluminum chloride;

[0042] c1 represents the dosage of polyacrylamide;

[0043] t1 backwash cycle;

[0044] Step 3.3: Input the water TOC obtained in Step 3.1 into the PAC fitting formula b1=0.34In(y)-1.01, the PAM fitting formula c1=0.01n(y)-0.01, and the backwash cycle fitting formula t1=-0.58In(y)+4.42 obtained in Step 3.2 to obtain b1, c1, and t1. Then, add b1 mg / L polyaluminum chloride and c1 mg / L polyacrylamide to the dosing system, respectively.

[0045] Step 3.4: Adjust the speed of the coagulation test stirrer, stir at 150 rpm for 5 minutes, stir at 50 rpm for 8 minutes, and let stand for 20 minutes.

[0046] Step 3.5: Measure the output of the coagulation test mixer to determine whether the TOC of the water meets the standard. If yes, proceed to step 3.6. Otherwise, adjust the dosage of polyaluminum chloride and polyacrylamide and the hydraulic conditions respectively. Add flocculant to the coagulation test mixer to destabilize and coagulate colloidal particles, so that the particles with a particle size of less than 50 μm coagulate into suspended matter with a particle size of more than 300 μm and settle.

[0047] The hydraulic condition is the flow velocity;

[0048] Step 3.6: Turn on the No. 1 and No. 2 reinjection pumps to transport the supernatant in the mine water collection tank to the No. 1 and No. 2 packing columns.

[0049] Step 3.7: When the recharge reaches the third preset time, turn off the No. 1 and No. 2 recharge water pumps by opening and closing them, and at the same time turn on the No. 1 and No. 2 clean water pumps at a flow rate of 2000ml / min to perform backwashing for t1 seconds; then continue the recharge process.

[0050] Step 3.8: When the reinjection reaches the fourth preset time, turn off the No. 1 and No. 2 reinjection pumps, turn on the No. 1 and No. 2 motors, and move the No. 1 inner plate and No. 2 inner plates radially inward until they contact each other; start the No. 1 and No. 2 thrusters to push the No. 1 and No. 2 packing columns back out of the wellhead, remove them from the wellhead, flush them, and reuse them.

[0051] Step four specifically includes the following steps:

[0052] Step 4.1: Open the first valve and the second valve to transport the mine water in the data acquisition unit to the dosing system. Use titration to test the water hardness of the mine water and find that it is a2 mg / L.

[0053] Step 4.2: Construct the PAC fitting formula b2=1.7In(z)-5.05, the PAM fitting formula c2=0.05n(z)-0.05, and the backwash cycle fitting formula t2=-2.9In(z)+22.1;

[0054] in:

[0055] z represents water hardness;

[0056] b2 represents the dosage of polyaluminum chloride;

[0057] c2 represents the dosage of polyacrylamide;

[0058] t2 backwash cycle;

[0059] Step 4.3: Input the water hardness obtained in Step 4.1 into the PAC fitting formula b2=1.7In(z)-5.05, the PAM fitting formula c2=0.05n(z)-0.05, and the backwash cycle fitting formula t2=-2.9In(z)+22.1 obtained in Step 4.2 to obtain b2, c2, and t2. Then, add b2 mg / L polyaluminum chloride and c2 mg / L polyacrylamide to the dosing system, respectively.

[0060] Step 4.4: Adjust the speed of the coagulation test stirrer. Stir at 150 rpm for 3 minutes, then at 50 rpm for 12 minutes, and let stand for 15 minutes.

[0061] Step 4.5: Test the water hardness at the tail end of the coagulation experiment mixer to determine whether the water hardness meets the standard. If yes, proceed to step 4.6. Otherwise, adjust the dosage of polyaluminum chloride and polyacrylamide and the hydraulic conditions respectively. Add flocculant to the coagulation experiment mixer to destabilize and coagulate colloidal particles, so that the particles with a particle size of less than 50 μm are coagulated into suspended matter with a particle size of more than 300 μm and then settle.

[0062] The hydraulic condition is the flow velocity;

[0063] Step 4.6: Turn on the No. 1 and No. 2 reinjection pumps to transport the supernatant in the mine water collection tank to the No. 1 and No. 2 packing columns.

[0064] Step 4.7: When the recharge reaches the fifth preset time, turn off the No. 1 and No. 2 recharge water pumps by opening and closing them, and at the same time turn on the No. 1 and No. 2 clean water pumps at a flow rate of 2000ml / min to perform backwashing for t2 seconds; then continue the recharge process.

[0065] Step 4.8: When the reinjection reaches the sixth preset time, turn off the No. 1 and No. 2 reinjection pumps, turn on the No. 1 and No. 2 motors, and move the No. 1 inner plate and No. 2 inner plate radially inward until they contact each other; start the No. 1 and No. 2 thrusters to push the No. 1 and No. 2 packing columns back out of the wellhead, remove them from the wellhead, flush them, and reuse them.

[0066] Step five specifically includes the following steps:

[0067] Step 5.1: Turn on the No. 1 and No. 2 reinjection pumps to transport the supernatant in the mine water collection tank to the No. 1 and No. 2 packing columns;

[0068] Step 5.2: When the recharge reaches the seventh preset time, turn off the No. 1 and No. 2 recharge water pumps by opening and closing them, and at the same time turn on the No. 1 and No. 2 clean water pumps at a flow rate of 2000ml / min to perform a 15s backwash; then continue the recharge process.

[0069] Step 5.3: When the reinjection reaches the eighth preset time, turn off the No. 1 and No. 2 reinjection pumps, turn on the No. 1 and No. 2 motors, and move the No. 1 inner plate and No. 2 inner plate radially inward until they contact each other; start the No. 1 and No. 2 thrusters to push the No. 1 and No. 2 packing columns back out of the wellhead, remove them from the wellhead, flush them, and reuse them.

[0070] Compared with the prior art, the beneficial technical effects of this invention are:

[0071] (I) In this invention, the mine water pretreatment system and the artificial reinjection system are combined. The pretreatment system is provided with feedback based on the degree of change in the permeability of the medium. The turbidity value is changed by adjusting the experimental parameters, which solves the linkage problem between water quality and the permeability of the reinjection medium. In addition, by adjusting the position of the inner plate and controlling the propeller, and supplementing it with backwashing at a certain period, the smooth reinjection of mine water with different water qualities is effectively realized. Therefore, the technical problem of reinjection blockage in the prior art is solved.

[0072] (II) In this invention, a first valve and a sample collector are set at the front end of the quartz sand column to avoid experimental errors caused by human operation and realize the automation of the entire experimental process. A rotor flow meter is set at the rear end of the quartz sand column. Although the metering pump also has the function of controlling the flow rate, the error is larger than that of the flow meter. Therefore, by setting a rotor flow meter, the sample flow rate can be accurately controlled.

[0073] (III) Multiple pressure sensors are installed on the side wall of the quartz sand column in this invention, which can realize real-time monitoring of the fluid pressure inside the quartz sand column, and facilitate the investigation of the permeability change law of the medium during the storage of mine water.

[0074] (IV) The main components, such as quartz sand column, mine water collection tank, coagulation experiment stirrer, sample collector, and metering pump, are arranged on a three-dimensional steel frame through the base. The space setting is relatively reasonable, the footprint is small, and it is suitable for laboratory operation. Attached Figure Description

[0075] Figure 1 This is a schematic diagram of the mine water pretreatment system of the present invention;

[0076] Figure 2 This is a schematic diagram of the artificial recharge system in the embodiment;

[0077] Figure 3 for Figure 2 A schematic diagram of the different stages;

[0078] Figure 4 for Figure 2 A diagram illustrating the different stages.

[0079] The meanings of the labels in the diagram are as follows: 1-quartz sand column, 2-pressure sensor, 3-second valve, 4-rotameter No. 1, 5-turbidity meter, 6-coagulation test stirrer, 7-metering pump, 8-intelligent dosing system, 9-rotameter No. 2, 10-mine water collection tank, 11-computer, 12-data acquisition device, 13-sample acquisition device, 14-pulley, 15-first valve, 16-base, 17-magnetic stirrer;

[0080] 18-No. 1 packing column, 19-No. 2 packing column, 20-No. 1 reinjection pump, 21-No. 2 reinjection pump, 22-clean water tank, 23-No. 1 clean water pump, 24-No. 2 clean water pump, 25-No. 1 inner plate, 26-No. 2 inner plate, 27-No. 1 propeller, 28-No. 2 propeller, 29-No. 1 motor, 30-No. 2 motor, 31-partition plate;

[0081] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0082] It should be noted that, unless otherwise specified, all components in this invention are those known in the art.

[0083] 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.

[0084] This invention provides a mine water pretreatment system, including a movable base 16. A sample collector 13, a data collector 12, and a mine water collection tank 10 are respectively mounted on the base 16. A quartz sand column 1 is fixed to the side wall of the base 16. The bottom of the quartz sand column 1 is connected to the sample collector 13. Multiple pressure sensors 2 are mounted on the side wall of the quartz sand column 1, and each pressure sensor is electrically connected to the data collector 12. The top of the quartz sand column 1 is connected to a coagulation test stirrer 6 via a first branch pipe. A metering pump 7 and a dosing system 8 are fixed to the side wall of the base 16. The metering pump 7 is connected to both the coagulation test stirrer 6 and the mine water collection tank 10. The dosing system 8 is connected to the coagulation test stirrer 6. A first valve 15 is provided between the quartz sand column 1 and the sample collector 13.

[0085] The first branch pipe is equipped with a second valve 3, a first rotor flowmeter 4 and a turbidity meter 5 in sequence; a second rotor flowmeter 9 is installed between the metering pump 7 and the mine water collection tank 10;

[0086] The data acquisition unit 12 is connected to the external computer 11.

[0087] In the above technical solution, a first valve and a sample collector are set at the front end of the quartz sand column, which avoids experimental errors caused by human operation and realizes full automation of the experimental process. A rotor flow meter is set at the rear end of the quartz sand column. Although the metering pump also has the function of controlling the flow rate, its error is larger than that of the flow meter. Therefore, by setting a rotor flow meter, the injection flow rate can be accurately controlled.

[0088] Multiple pressure sensors are installed on the sidewall of the quartz sand column, which can realize real-time monitoring of the fluid pressure inside the quartz sand column, and facilitate the investigation of the permeability change law of the medium during the storage of mine water.

[0089] The main components, including a quartz sand column, a mine water collection tank, a coagulation experiment stirrer, a sample collector, and a metering pump, are arranged on a three-dimensional steel frame via a base. The space is reasonably set up, occupies a small area, and is suitable for laboratory operation.

[0090] Specifically, the bottom of the base is equipped with casters 14, which facilitates the movement of the entire system.

[0091] Specifically, a magnetic stirrer 17 is installed in the mine water collection tank 10 to fully stir the mine water in the mine water collection tank 10;

[0092] Specifically, a pressure sensor 2 is connected to the side wall of the quartz sand column 1 via a flange, and the flange connection method is simple and stable.

[0093] Furthermore, an artificial reinjection system is provided, including a mine water tank 32 installed outside the U-shaped reinjection well and a first packing column 18 and a second packing column 19 installed on the inner wall of the U-shaped reinjection well. The mine water tank 32 is connected to the mine water collection tank 10 and the first and second packing columns 18 and 19, respectively. A first reinjection pump 20 and a second reinjection pump 21 are respectively installed between the first and second packing columns 18 and 19 and the mine water tank 32. A first thruster 27 and a second thruster 28 are correspondingly installed on the inner wall of the U-shaped reinjection well at the bottom of the first and second packing columns 18 and 19.

[0094] A pair of symmetrical partitions 31 are prefabricated on the inner wall of the U-shaped recharge well. The bottom of the pair of partitions 31 is provided with an inner plate 25 and an inner plate 26. The inner plate 25 and the inner plate 26 are respectively located between the first packing column 18 and the first thruster 27 and between the second packing column 19 and the second thruster 28. The inner plate 29 and the inner plate 30 are respectively connected to the inner plate 29 and the inner plate 30.

[0095] A clean water tank 22 is installed outside the U-shaped recharge well. The clean water tank 22 is connected to the inside of the U-shaped recharge well. A first clean water pump 23 and a second clean water pump 24 are installed between the clean water tank 22 and the U-shaped recharge well.

[0096] The inner wall of the U-shaped recharge well is pre-filled with gravel, coarse sand, fine sand, artificial zeolite, and CaCl2 of different particle sizes.

[0097] This invention also provides a method for artificial reinjection of mine water, based on a mine water pretreatment system and an artificial reinjection system, specifically including the following steps:

[0098] Step 1: Determine the water quality of the mine water in the mine water collection tank. If it is mine water containing suspended solids, proceed to Step 2; if it is mine water containing organic matter, proceed to Step 3; if it is mine water with hardness, proceed to Step 4; if it is clean mine water, proceed to Step 5.

[0099] Step two specifically includes the following steps:

[0100] Step 2.1: Open the first valve 15 and the second valve 3 to transport the mine water in the data acquisition unit to the dosing system, and use the turbidity meter 5 to test the turbidity of the mine water to obtain the water turbidity as a NTU, a > 0;

[0101] Step 2.2: Construct the PAC fitting formula b = 40.42In(x) - 120.82, the PAM fitting formula c = 0.32In(x) - 1.14, and the backwash cycle fitting formula t = -69.74In(x) + 529.94;

[0102] in:

[0103] x represents the turbidity of the water;

[0104] b represents the dosage of polyaluminum chloride;

[0105] c represents the dosage of polyacrylamide;

[0106] t backwash cycle;

[0107] Step 2.3: Input the water turbidity obtained in Step 2.1 into the PAC fitting formula b = 40.42In(x) - 120.82, the PAM fitting formula c = 0.32In(x) - 1.14, and the backwash cycle fitting formula t = -69.74In(x) + 529.94 obtained in Step 2.2 to obtain b, c, and t. Then, add b mg / L polyaluminum chloride and c mg / L polyacrylamide to the dosing system, respectively.

[0108] Step 2.4: Adjust the speed of the coagulation test stirrer 6, stir at 150 rpm for 3 minutes, then stir at 50 rpm for 10 minutes, and let stand for 15 minutes.

[0109] Step 2.5: Use turbidity monitor 5 to detect whether the turbidity meets the standard. If yes, proceed to step 2.6. Otherwise, adjust the dosage of polyaluminum chloride and polyacrylamide and the hydraulic conditions respectively. Add flocculant to coagulation test mixer 6 to destabilize and coagulate colloidal particles, so that the particles with a particle size of less than 50 μm are coagulated into suspended matter with a particle size of more than 300 μm and then settle.

[0110] The hydraulic condition is flow velocity;

[0111] Step 2.6: Turn on the No. 1 reinjection pump 20 and the No. 2 reinjection pump 21 to transport the supernatant in the mine water collection tank to the No. 1 packing column 18 and the No. 2 packing column 19.

[0112] Step 2.7: When the recharge reaches the first preset time, turn off the No. 1 recharge water pump 20 and the No. 2 recharge water pump 21 by opening and closing, and at the same time turn on the No. 1 clean water pump 23 and the No. 2 clean water pump 24 at a flow rate of 2000ml / min to perform backwashing for t seconds; then continue the recharge.

[0113] Step 2.8: When the reinjection reaches the second preset time, shut down the No. 1 reinjection pump 20 and the No. 2 reinjection pump 21, turn on the No. 1 motor 29 and the No. 2 motor 30, and move the No. 1 inner plate 25 and the No. 2 inner plate 26 radially inward until they contact each other; start the No. 1 thruster 27 and the No. 2 thruster 28 to push the No. 1 packing column 18 and the No. 2 packing column 19 back out of the wellhead, remove them from the wellhead, flush them, and reuse them.

[0114] Step three specifically includes the following steps:

[0115] Step 3.1: Open the first valve 15 and the second valve 3 to transport the mine water in the data acquisition unit to the dosing system. Use a TOC analyzer to test the TOC of the mine water and obtain a1 mg / L.

[0116] Step 3.2: Construct the PAC fitting formula b1=0.34In(y)-1.01, the PAM fitting formula c1=0.01n(y)-0.01, and the backwash cycle fitting formula t1=-0.58In(y)+4.42;

[0117] in:

[0118] y represents the total organic matter (TOC) of the water body;

[0119] b1 represents the dosage of polyaluminum chloride;

[0120] c1 represents the dosage of polyacrylamide;

[0121] t1 backwash cycle;

[0122] Step 3.3: Input the water TOC obtained in Step 3.1 into the PAC fitting formula b1=0.34In(y)-1.01, the PAM fitting formula c1=0.01n(y)-0.01, and the backwash cycle fitting formula t1=-0.58In(y)+4.42 obtained in Step 3.2 to obtain b1, c1, and t1. Then, add b1 mg / L polyaluminum chloride and c1 mg / L polyacrylamide to the dosing system, respectively.

[0123] Step 3.4: Adjust the speed of the coagulation test stirrer 6, stir at 150 rpm for 5 minutes, stir at 50 rpm for 8 minutes, and let stand for 20 minutes.

[0124] Step 3.5: Measure the output of the coagulation test mixer 6 to determine whether the TOC of the water meets the standard. If yes, proceed to step 3.6. Otherwise, adjust the dosage of polyaluminum chloride and polyacrylamide and the hydraulic conditions respectively. Add flocculant to the coagulation test mixer 6 to destabilize and coagulate colloidal particles, so that the particles with a particle size of less than 50 μm coagulate into suspended matter with a particle size of more than 300 μm and settle.

[0125] The hydraulic condition is flow velocity;

[0126] Step 3.6: Turn on the No. 1 reinjection pump 20 and the No. 2 reinjection pump 21 to transport the supernatant in the mine water collection tank to the No. 1 packing column 18 and the No. 2 packing column 19.

[0127] Step 3.7: When the recharge reaches the third preset time, turn off the No. 1 recharge water pump 20 and the No. 2 recharge water pump 21 by opening and closing, and at the same time turn on the No. 1 clean water pump 23 and the No. 2 clean water pump 24 at a flow rate of 2000ml / min to perform backwashing for t1 seconds; then continue the recharge process.

[0128] Step 3.8: When the reinjection reaches the fourth preset time, turn off the No. 1 reinjection pump 20 and the No. 2 reinjection pump 21, turn on the No. 1 motor 29 and the No. 2 motor 30, and move the No. 1 inner plate 25 and the No. 2 inner plate 26 radially inward until they contact each other; start the No. 1 thruster 27 and the No. 2 thruster 28 to push the No. 1 packing column 18 and the No. 2 packing column 19 back out of the wellhead, remove them from the wellhead, flush them, and reuse them.

[0129] Step four specifically includes the following steps:

[0130] Step 4.1: Open the first valve 15 and the second valve 3 to transport the mine water in the data acquisition unit to the dosing system. The water hardness of the mine water is measured to be a2 mg / L using the titration method.

[0131] Step 4.2: Construct the PAC fitting formula b2=1.7In(z)-5.05, the PAM fitting formula c2=0.05n(z)-0.05, and the backwash cycle fitting formula t2=-2.9In(z)+22.1;

[0132] in:

[0133] z represents water hardness;

[0134] b2 represents the dosage of polyaluminum chloride;

[0135] c2 represents the dosage of polyacrylamide;

[0136] t2 backwash cycle;

[0137] Step 4.3: Input the water hardness obtained in Step 4.1 into the PAC fitting formula b2=1.7In(z)-5.05, the PAM fitting formula c2=0.05n(z)-0.05, and the backwash cycle fitting formula t2=-2.9In(z)+22.1 obtained in Step 4.2 to obtain b2, c2, and t2. Then, add b2 mg / L polyaluminum chloride and c2 mg / L polyacrylamide to the dosing system, respectively.

[0138] Step 4.4: Adjust the speed of the coagulation test stirrer 6. Stir at 150 rpm for 3 minutes, then at 50 rpm for 12 minutes, and let stand for 15 minutes.

[0139] Step 4.5: Test the water hardness at the tail end of the coagulation test mixer 6 to determine whether the water hardness meets the standard. If yes, proceed to step 4.6. Otherwise, adjust the dosage of polyaluminum chloride and polyacrylamide and the hydraulic conditions respectively. Add flocculant to the coagulation test mixer 6 to destabilize and coagulate colloidal particles, so that the particles with a particle size of less than 50 μm are coagulated into suspended matter with a particle size of more than 300 μm and then settle.

[0140] The hydraulic condition is flow velocity;

[0141] Step 4.6: Turn on the No. 1 reinjection pump 20 and the No. 2 reinjection pump 21 to transport the supernatant in the mine water collection tank to the No. 1 packing column 18 and the No. 2 packing column 19.

[0142] Step 4.7: When the recharge reaches the fifth preset time, turn off the No. 1 recharge water pump 20 and the No. 2 recharge water pump 21 by opening and closing, and at the same time turn on the No. 1 clean water pump 23 and the No. 2 clean water pump 24 at a flow rate of 2000ml / min to perform backwashing for t2 seconds; then continue the recharge.

[0143] Step 4.8: When the reinjection reaches the sixth preset time, shut down the No. 1 reinjection pump 20 and the No. 2 reinjection pump 21, turn on the No. 1 motor 29 and the No. 2 motor 30, and move the No. 1 inner plate 25 and the No. 2 inner plate 26 radially inward until they contact each other; start the No. 1 thruster 27 and the No. 2 thruster 28 to push the No. 1 packing column 18 and the No. 2 packing column 19 back out of the wellhead, remove them from the wellhead, flush them, and reuse them.

[0144] Step five specifically includes the following steps:

[0145] Step 5.1: Turn on the No. 1 reinjection pump 20 and the No. 2 reinjection pump 21 to transport the supernatant in the mine water collection tank to the No. 1 packing column 18 and the No. 2 packing column 19;

[0146] Step 5.2: When the recharge reaches the seventh preset time, turn off the No. 1 recharge water pump 20 and the No. 2 recharge water pump 21 by opening and closing, and at the same time turn on the No. 1 clean water pump 23 and the No. 2 clean water pump 24 at a flow rate of 2000ml / min to perform a 15s backwash; then continue the recharge.

[0147] Step 5.3: When the reinjection reaches the eighth preset time, shut down the No. 1 reinjection pump 20 and the No. 2 reinjection pump 21, turn on the No. 1 motor 29 and the No. 2 motor 30, and move the No. 1 inner plate 25 and the No. 2 inner plate 26 radially inward until they contact each other; start the No. 1 thruster 27 and the No. 2 thruster 28 to push the No. 1 packing column 18 and the No. 2 packing column 19 back out of the wellhead, remove them from the wellhead, flush them, and reuse them.

[0148] In the above technical solution, the turbidity meter 5 is a Hach 2100Q turbidity meter; the TOC analyzer is a Mettler Toledo TOC analyzer; and the titration method is EDTA titration.

[0149] The first, third, and fifth preset times are given through the blockage formation process, and are generally given as 20 hours; the second, fourth, and sixth preset times are given through the blockage formation process, and are generally given as 40 hours; the seventh and eighth preset times are also given through the blockage formation process, and are generally given as 120 minutes and 500 minutes respectively.

[0150] By combining the mine water pretreatment system and the artificial reinjection system, feedback is provided to the pretreatment system based on the degree of change in media permeability. The turbidity value is changed by adjusting experimental parameters, which solves the linkage problem between water quality and reinjection media permeability. In addition, by adjusting the position of the inner plate and controlling the propeller, and supplementing it with backwashing at certain intervals, the smooth reinjection of mine water with different water qualities is effectively realized, thus solving the technical problem of reinjection blockage in the existing technology.

[0151] Example 1:

[0152] For high-turbidity mine water, with suspended solids concentration of 100-200 mg / L, turbidity of 200-500 NTU, COD of 50 mg / L, and Ca... 2+ The concentration was 215 mg / L, Mg 2+ The concentration is 150 mg / L, and the influent flow rate is 1000 ml / min.

[0153] High-turbidity mine water stored in Figure 2 The water storage tanks are recharged into the U-shaped recharge well by pump No. 1 (priming pump 21) and pump No. 2 (recharge pump 22), respectively, including:

[0154] First, high-turbidity mine water enters packing column 18 and packing column 29. The packing columns are pre-filled with particles of average diameter d. 50 In the gravel that has been sieved to ≥10mm, the No. 1 inner plate 25 and the No. 2 inner plate 26 are located at this time. Figure 2 Location;

[0155] Secondly, when the recharge has been in progress for 30 minutes, turn off pump 21 and pump 22, and turn on pump 23 and pump 24, with a flow rate of 2000 ml / min, to perform a 30-second backwash and continue recharge.

[0156] Then, after 100 minutes of recharge, turn off pump 21 (first recharge pump) and pump 22 (second recharge pump), turn on motor 29 (first motor) and motor 30 (second motor), and move inner plate 25 (first inner plate) and inner plate 26 (second inner plate) to... Figure 3Position, operate thrusters 1 (27) and 28 to push the packing back out of the wellhead, and move the two thrusters to... Figure 4 The wellhead can be cleaned and reused.

[0157] Finally, experiments proved that this method can ensure continuous reinjection of high-turbidity mine water for 360 days. Analysis of monitoring well samples showed that the turbidity decreased to 10 NTU, COD decreased to 22 mg / L, and Ca... 2+ Reduced to 176 mg / L, Mg 2+ It is 140 mg / L.

[0158] Example 2:

[0159] For low-turbidity mine water, with suspended solids concentration of 20-100 mg / L, turbidity of 5-200 NTU, COD of 35 mg / L, and Ca... 2+ 175 mg / L, Mg 2+ The concentration is 145 mg / L, and the influent flow rate is 2000 ml / min.

[0160] Low turbidity mine water stored in Figure 2 The water storage tank, which is recharged into the U-shaped recharge well by pump No. 1 (priming pump 21) and pump No. 2 (recharge pump 22), includes:

[0161] First, low-turbidity mine water enters packing column 18 and packing column 29. The packing columns are pre-filled with particles of average diameter ≤ 5d. 50 In the ≤10mm sieved gravel, the No. 1 inner plate 25 and the No. 2 inner plate 26 are located at this time. Figure 2 Location.

[0162] Secondly, when the recharge has been in progress for 60 minutes, turn off pump 21 and pump 22, and turn on pump 23 and pump 24, with a flow rate of 4000 ml / min, for 15 seconds of backwashing.

[0163] Then, after 200 minutes of recharge, turn off pump 21 (first recharge pump) and pump 22 (second recharge pump), turn on motor 29 (first motor) and motor 30 (second motor), and move inner plate 25 (first inner plate) and inner plate 26 (second inner plate) to... Figure 3 Position, operate thrusters 1 (27) and 2 (28) to push the packing back out of the wellhead, and move the thrusters to... Figure 4 The wellhead can be cleaned and reused.

[0164] Finally, experiments proved that this method can ensure continuous reinjection of low-turbidity mine water for 360 days. Analysis of monitoring well samples showed that the water turbidity decreased to 8 NTU, COD decreased to 19 mg / L, and Ca... 2+ Reduced to 156 mg / L, Mg2+ It is 140 mg / L.

[0165] Example 3:

[0166] For clean mine water, the suspended solids concentration is ≤20mg / L, turbidity is ≤5NTU, COD is 15mg / L, and Ca... 2+ The concentration was 145 mg / L, Mg 2+ The concentration is 116 mg / L, and the influent flow rate is 3000 ml / min.

[0167] Clean mine water is stored in Figure 2 The water storage tank is used to recharge water into the recharge well by pump No. 1 (priming pump 21) and pump No. 2 (recharge pump 22), and includes:

[0168] First, clean mine water enters packing column 18 and packing column 19. The packing columns are pre-filled with particles of average diameter d. 50≤ In the activated carbon that has been sieved to 5mm, the first inner plate 25 and the second inner plate 26 are located at this time. Figure 2 Location.

[0169] Secondly, when the recharge has been carried out for 120 minutes, turn off the No. 1 irrigation pump 21 and the No. 2 recharge pump 22, and at the same time turn on the No. 1 clean water pump 23 and the No. 2 clean water pump 24 at a flow rate of 3000 ml / min for 10 seconds of backwashing.

[0170] Then, after 500 minutes of reinjection, shut down pump 21 (first injection pump) and pump 22 (second reinjection pump), and turn on motors 29 (first motor) and 30 (second motor). Move inner plates 25 (first inner plate) and 26 (second inner plate) to position shown in Figure b. Operate thrusters 27 (first thruster) and 28 (second thruster) to push the packing material back out of the wellhead. Move the two thrusters to... Figure 4 The wellhead can be cleaned and reused.

[0171] Finally, experiments proved that this method can ensure continuous reinjection of clean mine water for 360 days. Analysis of monitoring well samples showed that water turbidity was ≤5 NTU, COD decreased to 12 mg / L, and Ca... 2+ Reduced to 140 mg / L, Mg 2+ It is 101 mg / L.

Claims

1. A combined system for mine water pretreatment and artificial reinjection, characterized in that, This includes mine water pretreatment systems and artificial reinjection systems; The mine water pretreatment system includes a movable base (16), on which a sample collector (13), a data collector (12), and a mine water collection tank (10) are respectively installed. A quartz sand column (1) is fixed on the side wall of the base (16), and the bottom of the quartz sand column (1) is connected to the sample collector (13). Multiple pressure sensors (2) are installed on the side wall of the quartz sand column (1), and the multiple pressure sensors (2) are all connected to the data collector (13). 2) Electrical connection; The top of the quartz sand column (1) is connected to a coagulation test stirrer (6) through a first branch pipe; A metering pump (7) and a dosing system (8) are fixedly installed on the side wall of the base (16). The metering pump (7) is connected to the coagulation test stirrer (6) and the mine water collection tank (10) respectively. The dosing system (8) is connected to the coagulation test stirrer (6). A first valve (15) is provided between the quartz sand column (1) and the sample collector (13). The first branch pipe is sequentially equipped with a second valve (3), a first rotor flow meter (4) and a turbidity meter (5); a second rotor flow meter (9) is installed between the metering pump (7) and the mine water collection tank (10); the data acquisition device (12) is connected to an external computer (11); The artificial reinjection system includes a mine water tank (32) located outside the U-shaped reinjection well and a No. 1 packing column (18) and a No. 2 packing column (19) located on the inner wall of the U-shaped reinjection well. The mine water tank (32) is connected to the mine water collection tank (10) and the No. 1 packing column (18) and the No. 2 packing column (19) respectively. A No. 1 reinjection pump (20) and a No. 2 reinjection pump (21) are respectively installed between the No. 1 packing column (18) and the No. 2 packing column (19) and the mine water tank (32). A No. 1 thruster (27) and a No. 2 thruster (28) are correspondingly installed on the inner wall of the U-shaped reinjection well at the bottom of the No. 1 packing column (18) and the No. 2 packing column (19). The inner wall of the U-shaped recharge well is prefabricated with a pair of symmetrical partitions (31). The bottom of the pair of partitions (31) is provided with an inner plate No. 1 (25) and an inner plate No. 2 (26). The inner plate No. 1 (25) and the inner plate No. 2 (26) are respectively located between the packing column No. 1 (18) and the thruster No. 1 (27) and between the packing column No. 2 (19) and the thruster No. 2 (28). The inner plate No. 1 (29) and the inner plate No. 2 (30) are respectively connected to the inner plate No. 1 and the inner plate No.

2. Turn on motor 1 (29) and motor 2 (30), and move inner plate 1 (25) and inner plate 2 (26) radially inward until they contact each other; start thruster 1 (27) and thruster 2 (28) to push packing column 1 (18) and packing column 2 (19) out of the wellhead; A clean water tank (22) is provided outside the U-shaped recharge well. The clean water tank (22) is connected to the inside of the U-shaped recharge well. A first clean water pump (23) and a second clean water pump (24) are provided between the clean water tank (22) and the U-shaped recharge well. The inner wall of the U-shaped recharge well is pre-filled with gravel, coarse sand, fine sand, artificial zeolite, and CaCl2 of different particle sizes.

2. The combined system of mine water pretreatment and artificial reinjection as described in claim 1, characterized in that, The base is provided with pulleys (14) at its bottom.

3. The combined system of mine water pretreatment and artificial reinjection as described in claim 1, characterized in that, A magnetic stirrer (17) is installed in the mine water collection tank (10).

4. The combined system of mine water pretreatment and artificial reinjection as described in claim 1, characterized in that, A pressure sensor (2) is connected to the side wall of the quartz sand column (1) via a flange.

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