Mine water pretreatment system, artificial recharge system and method

Abstract

The invention discloses a mine water pretreatment system and an artificial recharge system and method.The mine water pretreatment system comprises a movable base, a sample collector, a data collector and a mine water collecting box are arranged 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 with the sample collector; a plurality of pressure sensors are arranged on the side wall of the quartz sand column; the plurality of pressure sensors are electrically connected with the data acquisition unit; a mine water pre-treatment system and a manual recharge system are combined, feedback is provided for the pre-treatment system according to the change degree of the permeability of a medium, the turbidity value is changed by adjusting experimental parameters, the linkage problem of water quality and the permeability of a recharge medium is solved, and in addition, by adjusting the position of an inner plate and controlling a propeller, the permeability of the recharge medium is adjusted. And with the assistance of backwashing in a certain period, smooth recharge of mine water with different water qualities is effectively realized, so that the technical problem of recharge blockage in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the field of mine water resource protection and utilization, and relates to a recharge system, in particular to a mine water pretreatment system, an artificial recharge system and a method. Background Art

[0002] Mine water refers to a type of water source that appears in mines during the development of coal resources, which destroys the original stable structure of underground aquifers. It mainly comes from the water in the loose layer of the Quaternary System and groundwater that is replenished by surface infiltration. The main pollutants in mine water are coal powder, rock dust, etc. The water body presents water quality characteristics of high suspended matter and high turbidity. The particle size of the above suspended matter is usually below 50μm, which is difficult to remove by natural sedimentation.

[0003] First, the traditional method of treating high turbidity mine water tends to be terminal treatment, mainly based on surface and underground treatment, which has the problems of complex equipment selection and high treatment cost;

[0004] Secondly, based on the contradiction between coal mining and water resources in my country, predecessors proposed the concept of artificial recharge of mine water. The current research focuses on the storage capacity and safety analysis of the recharge stratum. However, there are few studies on the difficulty of injection and extraction in recharge. The recharge pumping capacity mainly depends on the change of medium permeability. However, in the study, it was found that there is a contradiction between the self-purification effect of artificial recharge water and the decrease in medium permeability. When the mine water presents a high turbidity water quality condition, the turbidity removal rate is often high after flowing through the aquifer, but at this time the permeability of the medium will show a high degree of decline. In order to achieve low turbidity water quality, it often takes a large treatment cost, and the mechanism of self-purification of water quality in the recharge process is not fully utilized.

[0005] Finally, there is currently no normative definition of water quality indicators for artificial mine water reinjection. The reason is that the requirements for inlet water quality vary greatly under different regions and rock conditions. It is necessary to artificially simulate the current situation of the study area and define the inlet water indicators in advance through indoor experimental methods. Summary of the invention

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a mine water pretreatment system, an artificial recharge system and a method to solve the technical problem of recharge blockage in the prior art.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0008] A mine water pretreatment system comprises a movable base, on which a sample collector, a data collector and a mine water collection box are respectively arranged, a quartz sand column is fixed on the side wall of the base, the bottom of the quartz sand column is connected to the sample collector, a plurality of pressure sensors are arranged on the side wall of the quartz sand column, and the plurality of pressure sensors are electrically connected to the data collector; the top of the quartz sand column is connected to a coagulation test agitator through a first branch pipe; a metering pump and a dosing system are fixed on the side wall of the base, the metering pump is respectively connected to the coagulation test agitator and the mine water collection box, the dosing system is connected to the coagulation test agitator, and a first valve is arranged between the quartz sand column and the sample collector;

[0009] The first branch pipe is provided with a second valve, a No. 1 rotor flowmeter and a turbidity meter in sequence; a No. 2 rotor flowmeter is provided between the metering pump and the mine water collection tank;

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

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

[0012] A pulley is arranged at the bottom of the base.

[0013] A magnetic stirrer is arranged in the mine water collection box.

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

[0015] An artificial recharge system, comprising a mine water tank arranged outside a U-shaped recharge well and a No. 1 packing column and a No. 2 packing column arranged on the inner wall of the U-shaped recharge well, the mine water tank is connected to the mine water collection tank and the No. 1 packing column and the No. 2 packing column are respectively connected, a No. 1 recharge water pump and a No. 2 recharge water pump are respectively arranged between the No. 1 packing column and the No. 2 packing column and the mine water tank; a No. 1 propeller and a No. 2 propeller are correspondingly arranged on the inner wall of the U-shaped recharge well at the bottom of the No. 1 packing column and the No. 2 packing column;

[0016] A pair of symmetrical partitions are prefabricated on the inner wall of the U-shaped reinjection well, and a first inner plate and a second inner plate are arranged at the bottom of the pair of partitions; the first inner plate and the second inner plate are respectively arranged between the first packing column and the first propeller and between the second packing column and the second propeller; the first inner plate and the second inner plate are respectively connected to a first motor and a second motor

[0017] A clean water tank is arranged outside the U-shaped recharging well, the clean water tank is connected to the inside of the U-shaped recharging well, and a first clean water pump and a second clean water pump are arranged between the clean water tank and the U-shaped recharging well;

[0018] Gravel, coarse sand, fine sand, artificial zeolite and CaCl2 with different particle sizes are preset on the inner wall of the U-shaped recharge well.

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

[0020] Step 1, judging the water quality of the mine water in the mine water collection box, if it is mine water containing suspended matter, then proceed to step 2, if it is mine water containing organic matter, then proceed to step 3, if it is mine water containing hardness, then proceed to step 4; if it is clean mine water, then proceed to step 5;

[0021] Step 2 specifically includes the following steps:

[0022] Step 2.1, open the first valve and the second valve, transport the mine water in the data collector to the dosing system, and use a turbidity meter to test the turbidity of the mine water to obtain a NTU turbidity of the water body, 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 water;

[0026] b represents the dosage of polyaluminium chloride;

[0027] c represents the dosage of polyacrylamide;

[0028] tBackwash 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, respectively, to obtain b, c and t, and add b mg / L polyaluminium chloride and c mg / L polyacrylamide to the dosing system respectively;

[0030] Step 2.4, adjusting the speed of the coagulation test stirrer, stirring at 150 rpm for 3 min, stirring at 50 rpm for 10 min, and letting it stand for 15 min;

[0031] Step 2.5, using a turbidity monitor to detect whether the turbidity meets the standard, if yes, proceed to step 2.6, otherwise adjust the dosage of polyaluminium chloride and polyacrylamide and the hydraulic conditions respectively, add flocculant in the coagulation test mixer to destabilize and coagulate the colloidal particles, so that the particles with a particle size of less than 50 μm are coagulated into suspended matter larger than 300 μm, and then settle;

[0032] The hydraulic condition is flow rate;

[0033] Step 2.6, turning on the No. 1 recharging water pump and the No. 2 recharging water pump to transfer the supernatant in the mine water collection tank to the No. 1 packing column and the No. 2 packing column;

[0034] Step 2.7, when the recharging reaches the first preset time, the No. 1 recharging water pump and the No. 2 recharging water pump are turned off by opening and closing, and the No. 1 clean water pump and the No. 2 clean water pump are turned on at the same time, with a flow rate of 2000 ml / min, and backwashing is performed for t seconds; then the recharging continues;

[0035] Step 2.8, when the recharging reaches the second preset time, turn off the No. 1 recharging water pump and the No. 2 recharging water pump, turn on the No. 1 motor and the No. 2 motor, move the No. 1 inner plate and the No. 2 inner plate radially inward until the No. 1 inner plate and the No. 2 inner plate are in contact; start the No. 1 thruster and the No. 2 thruster to push the No. 1 packing column and the No. 2 packing column back out of the wellhead, take them out from the wellhead and rinse them for reuse;

[0036] The step three specifically includes the following steps:

[0037] Step 3.1, open the first valve and the second valve, transfer the mine water in the data acquisition device to the dosing system, and use a TOC meter to test and obtain that the TOC of the mine water is 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 backwashing cycle fitting formula t1=-0.58In(y)+4.42;

[0039] in:

[0040] y represents water body TOC;

[0041] b1 represents the dosage of polyaluminium chloride;

[0042] c1 represents the dosage of polyacrylamide;

[0043] t1 backwash cycle;

[0044] Step 3.3, input the water body TOC obtained in step 3.1 into the PAC fitting formula b1=0.34In(y)-1.01, PAM fitting formula c1=0.01n(y)-0.01 and backwashing cycle fitting formula t1=-0.58In(y)+4.42 obtained in step 3.2, to obtain b1, c1 and t1, and add b1 mg / L polyaluminium chloride and c1 mg / L polyacrylamide to the dosing system respectively;

[0045] Step 3.4, adjusting the speed of the coagulation test stirrer, stirring at 150 rpm for 5 min, stirring at 50 rpm for 8 min, and standing for 20 min;

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

[0047] The hydraulic condition is flow rate;

[0048] Step 3.6, turning on the No. 1 recharging water pump and the No. 2 recharging water pump to transfer the supernatant in the mine water collection tank to the No. 1 packing column and the No. 2 packing column;

[0049] Step 3.7, when the recharging reaches the third preset time, the No. 1 recharging water pump and the No. 2 recharging water pump are turned off by opening and closing, and the No. 1 clean water pump and the No. 2 clean water pump are turned on at the same time, with a flow rate of 2000 ml / min, and a backwashing of t1 seconds is performed; and then the recharging is continued;

[0050] Step 3.8, when the recharging reaches the fourth preset time, turn off the No. 1 recharging water pump and the No. 2 recharging water pump, turn on the No. 1 motor and the No. 2 motor, move the No. 1 inner plate and the No. 2 inner plate radially inward until the No. 1 inner plate and the No. 2 inner plate are in contact; start the No. 1 thruster and the No. 2 thruster to push the No. 1 packing column and the No. 2 packing column back out of the wellhead, take them out from the wellhead and rinse them for reuse;

[0051] The step 4 specifically includes the following steps:

[0052] Step 4.1, open the first valve and the second valve, transfer the mine water in the data collector to the dosing system, and use the titration method to test the hardness of the mine water to be 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 the water hardness;

[0056] b2 represents the dosage of polyaluminium 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, PAM fitting formula c2=0.05n(z)-0.05 and backwashing cycle fitting formula t2=-2.9In(z)+22.1 obtained in step 4.2, respectively, to obtain b2, c2 and t2, and add b2 mg / L polyaluminium chloride and c2 mg / L polyacrylamide to the dosing system respectively;

[0060] Step 4.4, adjust the speed of the coagulation test mixer, stir at 150 rpm for 3 min, stir at 50 rpm for 12 min, and let stand for 15 min.

[0061] Step 4.5, testing the water hardness at the tail end of the coagulation test mixer to determine whether the water hardness meets the standard, if yes, proceed to step 4.6, otherwise, respectively adjust the dosage of polyaluminium chloride and polyacrylamide and the hydraulic conditions, add flocculant to the coagulation test mixer to destabilize and coagulate the colloidal particles, so that the particles with a particle size of less than 50 μm are coagulated into suspended matter larger than 300 μm, and then settle;

[0062] The hydraulic condition is flow rate;

[0063] Step 4.6, turning on the No. 1 recharging water pump and the No. 2 recharging water pump to transfer the supernatant in the mine water collection tank to the No. 1 packing column and the No. 2 packing column;

[0064] Step 4.7, when the recharging reaches the fifth preset time, the No. 1 recharging water pump and the No. 2 recharging water pump are turned off by opening and closing, and the No. 1 clean water pump and the No. 2 clean water pump are turned on at the same time, with a flow rate of 2000 ml / min, and a backwashing for t2 seconds is performed; and then the recharging is continued;

[0065] Step 4.8, when the recharging reaches the sixth preset time, turn off the No. 1 recharging water pump and the No. 2 recharging water pump, turn on the No. 1 motor and the No. 2 motor, move the No. 1 inner plate and the No. 2 inner plate radially inward until the No. 1 inner plate and the No. 2 inner plate are in contact; start the No. 1 thruster and the No. 2 thruster to push the No. 1 packing column and the No. 2 packing column back out of the wellhead, take them out from the wellhead and rinse them for reuse;

[0066] The step five specifically includes the following steps:

[0067] Step 5.1, turn on the No. 1 recharging water pump and the No. 2 recharging water pump to transfer the supernatant in the mine water collection tank to the No. 1 packing column and the No. 2 packing column;

[0068] Step 5.2, when the recharging reaches the seventh preset time, the No. 1 recharging water pump and the No. 2 recharging water pump are turned off by opening and closing, and the No. 1 clean water pump and the No. 2 clean water pump are turned on at the same time, with a flow rate of 2000ml / min, and a 15s backwash is performed; and then the recharging is continued;

[0069] Step 5.3, when the reinjection reaches the eighth preset time, turn off the No. 1 reinjection water pump and the No. 2 reinjection water pump, turn on the No. 1 motor and the No. 2 motor, move the No. 1 inner plate and the No. 2 inner plate radially inward until the No. 1 inner plate and the No. 2 inner plate are in contact; start the No. 1 thruster and the No. 2 thruster to push the No. 1 packing column and the No. 2 packing column back out of the wellhead, take them out from the wellhead and rinse them for reuse.

[0070] Compared with the prior art, the present invention has the following beneficial technical effects:

[0071] (I) The present invention combines the mine water pretreatment system and the artificial reinjection system, provides feedback to the pretreatment system according to the degree of change in the medium permeability, and changes the turbidity value by adjusting the experimental parameters, thereby solving the linkage problem between water quality and reinjection medium permeability. In addition, by adjusting the position of the inner plate and controlling the propeller, supplemented by a certain period of backwashing, the smooth reinjection of mine water with different water qualities is effectively achieved, thereby solving the technical problem of reinjection blockage in the prior art.

[0072] (II) In the present invention, a first valve and a sample collector are provided at the front end of the quartz sand column, thereby avoiding experimental errors caused by human operation and realizing full automation of the experimental process. A rotor flowmeter is provided 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 flowmeter. Therefore, the rotor flowmeter can be provided to accurately control the injection flow rate.

[0073] (III) A plurality of pressure sensors are arranged on the side wall of the quartz sand column in the present invention, which can realize real-time monitoring of the fluid pressure in the quartz sand column, and is convenient for exploring the permeability change law of the medium during the mine water storage process.

[0074] (IV) The main components including quartz sand column, mine water collection box, coagulation experiment mixer, sample collector, metering pump, etc. are arranged on a three-dimensional steel frame through the base. The space arrangement is relatively reasonable, the footprint is small, and it is suitable for laboratory operation. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0076] Figure 2 Schematic diagram of the structure of the artificial recharge system in the embodiment;

[0077] Figure 3 for Figure 2 Schematic diagram of the different stages of

[0078] Figure 4 for Figure 2 Schematic diagram of the different stages of.

[0079] The meanings of the numbers in the figure are: 1-quartz sand column, 2-pressure sensor, 3-second valve, 4-No. 1 rotor flowmeter, 5-turbidity meter, 6-coagulation test agitator, 7-metering pump, 8-intelligent dosing system, 9-No. 2 rotor flowmeter, 10-mine water collection box, 11-computer, 12-data collector, 13-sample collector, 14-pulley, 15-first valve, 16-base, 17-magnetic stirrer;

[0080] 18- No. 1 packing column, 19- No. 2 packing column, 20- No. 1 recharging water pump, 21- No. 2 recharging water 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;

[0081] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

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

[0083] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0084] The present invention provides a mine water pretreatment system, comprising a movable base 16, on which a sample collector 13, a data collector 12 and a mine water collection box 10 are respectively arranged, a quartz sand column 1 is fixed on the side wall of the base 16, the bottom of the quartz sand column 1 is connected to the sample collector 13, a plurality of pressure sensors 2 are arranged on the side wall of the quartz sand column 1, and the plurality of pressure sensors are electrically connected to the data collector 12; the top of the quartz sand column 1 is connected to a coagulation test agitator 6 through a first branch pipe; a metering pump 7 and a dosing system 8 are fixedly arranged on the side wall of the base 16, the metering pump 7 is respectively connected to the coagulation test agitator 6 and the mine water collection box 10, the dosing system 8 is connected to the coagulation test agitator 6, and a first valve 15 is arranged between the quartz sand column 1 and the sample collector 13;

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

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

[0087] In the above technical solution, a first valve and a sample collector are arranged at the front end of the quartz sand column, which avoids experimental errors caused by human operation and realizes the automation of the entire experimental process. A rotor flowmeter is arranged 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 flowmeter. Therefore, the rotor flowmeter can be used to accurately control the injection flow rate.

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

[0089] The main components such as quartz sand column, mine water collection box, coagulation experiment mixer, sample collector, metering pump, etc. 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 operations.

[0090] Specifically, a pulley 14 is provided at the bottom of the base, and the pulley 14 is provided to facilitate the movement of the entire system.

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

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

[0093] Further, an artificial recharge system is provided, comprising a mine water tank 32 arranged outside a U-shaped recharge well and a No. 1 packing column 18 and a No. 2 packing column 19 arranged on the inner wall of the U-shaped recharge well, the mine water tank 32 is connected to a mine water collection box 10 and the No. 1 packing column 18 and the No. 2 packing column 19 respectively, a No. 1 recharge water pump 20 and a No. 2 recharge water pump 21 are respectively arranged between the No. 1 packing column 18 and the No. 2 packing column 19 and the mine water tank 32; a No. 1 propeller 27 and a No. 2 propeller 28 are correspondingly arranged on the inner wall of the U-shaped recharge well at the bottom of the No. 1 packing column 18 and the No. 2 packing column 19;

[0094] A pair of symmetrical partitions 31 are prefabricated on the inner wall of the U-shaped recharging well, and a first inner plate 25 and a second inner plate 26 are arranged at the bottom of the pair of partitions 31; the first inner plate 25 and the second inner plate 26 are respectively arranged between the first packing column 18 and the first propeller 27 and between the second packing column 19 and the second propeller 28; the first inner plate and the second inner plate are respectively connected to a first motor 29 and a second motor 30;

[0095] A clean water tank 22 is provided outside the U-shaped recharging well, the clean water tank 22 is connected to the inside of the U-shaped recharging well, and 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 recharging well;

[0096] Gravel, coarse sand, fine sand, artificial zeolite and CaCl2 of different particle sizes are preset on the inner wall of the U-shaped recharge well.

[0097] The present invention also provides a method for artificial recharging of mine water, which is based on a mine water pretreatment system and an artificial recharging system and specifically includes the following steps:

[0098] Step 1, judging the water quality of the mine water in the mine water collection box, if it is mine water containing suspended matter, then proceed to step 2, if it is mine water containing organic matter, then proceed to step 3, if it is mine water containing hardness, then proceed to step 4; if it is clean mine water, then proceed to step 5;

[0099] Step 2 specifically includes the following steps:

[0100] Step 2.1, open the first valve 15 and the second valve 3, transport the mine water in the data collector to the dosing system, and use the turbidity meter 5 to test the turbidity of the mine water, and obtain the turbidity of the water body 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 water;

[0104] b represents the dosage of polyaluminium chloride;

[0105] c represents the dosage of polyacrylamide;

[0106] tBackwash 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, respectively, to obtain b, c and t, and add b mg / L polyaluminium chloride and c mg / L polyacrylamide to the dosing system respectively;

[0108] Step 2.4, adjusting the rotation speed of the coagulation test stirrer 6, stirring at a speed of 150 rpm for 3 min, then stirring at a speed of 50 rpm for 10 min, and standing for 15 min;

[0109] Step 2.5, using a turbidity monitor 5 to detect whether the turbidity meets the standard, if yes, proceed to step 2.6, otherwise adjust the dosage of polyaluminium chloride and polyacrylamide and the hydraulic conditions respectively, add a flocculant in the coagulation test stirrer 6 to destabilize and coagulate the colloidal particles, so that the particles originally less than 50 μm are coagulated into suspended matter larger than 300 μm, and then settle;

[0110] The hydraulic condition is the flow rate;

[0111] Step 2.6, turning on the No. 1 recharging water pump 20 and the No. 2 recharging water pump 21 to transfer 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 recharging reaches the first preset time, the No. 1 recharging water pump 20 and the No. 2 recharging water pump 21 are turned off by opening and closing, and the No. 1 clean water pump 23 and the No. 2 clean water pump 24 are turned on at the same time, with a flow rate of 2000 ml / min, and backwashing is performed for t seconds; then the recharging continues;

[0113] Step 2.8, when the recharging reaches the second preset time, turn off the No. 1 recharging water pump 20 and the No. 2 recharging water pump 21, turn on the No. 1 motor 29 and the No. 2 motor 30, move the No. 1 inner plate 25 and the No. 2 inner plate 26 radially inward until the No. 1 inner plate 25 and the No. 2 inner plate 26 contact; 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, take them out from the wellhead and rinse them for reuse;

[0114] Step three specifically includes the following steps:

[0115] Step 3.1, open the first valve 15 and the second valve 3, transport the mine water in the data acquisition device to the dosing system, and use a TOC meter to test and obtain that the TOC of the mine water is 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 backwashing cycle fitting formula t1=-0.58In(y)+4.42;

[0117] in:

[0118] y represents water body TOC;

[0119] b1 represents the dosage of polyaluminium chloride;

[0120] c1 represents the dosage of polyacrylamide;

[0121] t1 backwash cycle;

[0122] Step 3.3, input the water body TOC obtained in step 3.1 into the PAC fitting formula b1=0.34In(y)-1.01, PAM fitting formula c1=0.01n(y)-0.01 and backwashing cycle fitting formula t1=-0.58In(y)+4.42 obtained in step 3.2, to obtain b1, c1 and t1, and add b1 mg / L polyaluminium chloride and c1 mg / L polyacrylamide to the dosing system respectively;

[0123] Step 3.4, adjusting the rotation speed of the coagulation test stirrer 6, stirring at a speed of 150 rpm for 5 min, stirring at a speed of 50 rpm for 8 min, and standing for 20 min;

[0124] Step 3.5, measuring at the output end of the coagulation test stirrer 6 to determine whether the TOC of the water body meets the standard, if yes, proceed to step 3.6, otherwise adjust the dosage of polyaluminium chloride and polyacrylamide and the hydraulic conditions respectively, add flocculant in the coagulation test stirrer 6 to destabilize and coagulate the colloidal particles, so that the particles with a particle size of less than 50 μm are coagulated into suspended matter larger than 300 μm, and then settle;

[0125] The hydraulic condition is the flow rate;

[0126] Step 3.6, turning on the No. 1 recharging water pump 20 and the No. 2 recharging water pump 21 to transfer 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 recharging reaches the third preset time, the No. 1 recharging water pump 20 and the No. 2 recharging water pump 21 are turned off by opening and closing, and the No. 1 clean water pump 23 and the No. 2 clean water pump 24 are turned on at the same time, with a flow rate of 2000 ml / min, and backwashing is performed for t1 seconds; then the recharging continues;

[0128] Step 3.8, when the recharging reaches the fourth preset time, turn off the No. 1 recharging water pump 20 and the No. 2 recharging water pump 21, turn on the No. 1 motor 29 and the No. 2 motor 30, move the No. 1 inner plate 25 and the No. 2 inner plate 26 radially inward until the No. 1 inner plate 25 and the No. 2 inner plate 26 contact; 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, take them out from the wellhead and rinse them for reuse;

[0129] Step 4 specifically includes the following steps:

[0130] Step 4.1, open the first valve 15 and the second valve 3, transfer the mine water in the data collector to the dosing system, and use the titration method to test the hardness of the mine water to be a2 mg / L;

[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 the water hardness;

[0134] b2 represents the dosage of polyaluminium 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, PAM fitting formula c2=0.05n(z)-0.05 and backwashing cycle fitting formula t2=-2.9In(z)+22.1 obtained in step 4.2, respectively, to obtain b2, c2 and t2, and add b2 mg / L polyaluminium 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 min, stir at 50 rpm for 12 min, and let stand for 15 min.

[0139] Step 4.5, testing the water hardness at the tail end of the coagulation test stirrer 6 to determine whether the water hardness meets the standard, if yes, proceeding to step 4.6, otherwise respectively adjusting the dosage of polyaluminium chloride and polyacrylamide and the hydraulic conditions, adding flocculant to the coagulation test stirrer 6 to destabilize and coagulate the colloidal particles, so that the particles originally less than 50 μm in size are coagulated into suspended matter larger than 300 μm, and then sedimenting;

[0140] The hydraulic condition is the flow rate;

[0141] Step 4.6, turning on the No. 1 recharging water pump 20 and the No. 2 recharging water pump 21 to transfer 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 recharging reaches the fifth preset time, the No. 1 recharging water pump 20 and the No. 2 recharging water pump 21 are turned off by opening and closing, and the No. 1 clean water pump 23 and the No. 2 clean water pump 24 are turned on at the same time, with a flow rate of 2000 ml / min, and a backwashing for t2 seconds is performed; and then the recharging continues;

[0143] Step 4.8, when the recharging reaches the sixth preset time, turn off the No. 1 recharging water pump 20 and the No. 2 recharging water pump 21, turn on the No. 1 motor 29 and the No. 2 motor 30, move the No. 1 inner plate 25 and the No. 2 inner plate 26 radially inward until the No. 1 inner plate 25 and the No. 2 inner plate 26 contact; 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, take them out from the wellhead and rinse them for reuse;

[0144] Step 5 specifically includes the following steps:

[0145] Step 5.1, turn on the No. 1 recharging water pump 20 and the No. 2 recharging water pump 21 to transfer 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 recharging reaches the seventh preset time, the No. 1 recharging water pump 20 and the No. 2 recharging water pump 21 are turned off by opening and closing, and the No. 1 clean water pump 23 and the No. 2 clean water pump 24 are turned on at the same time, with a flow rate of 2000 ml / min, and a 15s backwashing is performed; and then the recharging is continued;

[0147] Step 5.3, when the recharging reaches the eighth preset time, turn off the No. 1 recharging water pump 20 and the No. 2 recharging water pump 21, turn on the No. 1 motor 29 and the No. 2 motor 30, move the No. 1 inner plate 25 and the No. 2 inner plate 26 radially inward until the No. 1 inner plate 25 and the No. 2 inner plate 26 contact; 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, take them out from the wellhead and rinse them for reuse;

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

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

[0150] The mine water pretreatment system and the artificial reinjection system are combined to provide feedback to the pretreatment system according to the degree of change in the medium permeability, and the turbidity value is changed by adjusting the experimental parameters, thereby solving the linkage problem between water quality and reinjection medium permeability. In addition, by adjusting the position of the inner plate and controlling the propeller, supplemented by a certain period of backwashing, the smooth reinjection of mine water with different water qualities is effectively achieved, thereby solving the technical problem of reinjection blockage in the prior art.

[0151] Embodiment 1:

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

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

[0154] First, the high turbidity mine water enters the No. 1 packing column 18 and the No. 2 packing column 19. The filling inside the packing column is pre-filled according to the average particle size d 50 ≥10mm screened gravel, the first inner plate 25 and the second inner plate 26 are located at Figure 2 Location;

[0155] Secondly, when the recharging is carried out for 30 minutes, turn off the No. 1 filling pump 21 and the No. 2 recharging pump 22, and turn on the No. 1 clean water pump 23 and the No. 2 clean water pump 24 at the same time, with a flow rate of 2000ml / min, and perform backwashing for 30 seconds, and continue recharging;

[0156] Then, when the recharging process lasts for 100 minutes, the first water pump 21 and the second water pump 22 are turned off, the first motor 29 and the second motor 30 are turned on, and the first inner plate 25 and the second inner plate 26 are moved to Figure 3Position, operate the No. 1 thruster 27 and the No. 2 thruster 28 to push the filler back out of the wellhead, and move the two thrusters to Figure 4 Position, it can be recycled after being taken out from the wellhead and flushed.

[0157] Finally, the experiment proved that this method can ensure the continuous recharge of high turbidity mine water for 360 days. Through sampling and analysis of monitoring wells, the turbidity of water quality dropped to 10NTU, COD dropped to 22mg / L, and Ca 2+ Reduced to 176mg / L, Mg 2+ It is 140mg / L.

[0158] Embodiment 2:

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

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

[0161] First, the low turbidity mine water enters the No. 1 packing column 18 and the No. 2 packing column 19. The filling inside the packing column is pre-filled according to the average particle size 5≤d 50 ≤10mm screened gravel, the first inner plate 25 and the second inner plate 26 are located at Figure 2 Location.

[0162] Secondly, when the recharging is carried out for 60 minutes, turn off the No. 1 filling water pump 21 and the No. 2 recharging water pump 22, and turn on the No. 1 clean water pump 23 and the No. 2 clean water pump 24 at the same time, with a flow rate of 4000ml / min, and perform 15s of backwashing.

[0163] Then, when the recharging process lasts for 200 minutes, the first filling pump 21 and the second recharging pump 22 are turned off, the first motor 29 and the second motor 30 are turned on, and the first inner plate 25 and the second inner plate 26 are moved to Figure 3 Position, operate the No. 1 thruster 27 and No. 2 thruster 28 to push the filler back out of the wellhead, and move the thrusters to Figure 4 Position, it can be recycled after being taken out from the wellhead and flushed.

[0164] Finally, the experiment proved that this method can ensure the continuous recharge of low turbidity mine water for 360 days. Through sampling and analysis of monitoring wells, the turbidity of water quality dropped to 8NTU, COD dropped to 19mg / L, and Ca 2+ Reduced to 156mg / L, Mg2+ It is 140mg / L.

[0165] Embodiment three:

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

[0167] Clean mine water is stored in Figure 2 The water storage tank is recharged to the recharge well by the No. 1 recharge pump 21 and the No. 2 recharge pump 22, including:

[0168] First, the clean mine water enters the No. 1 packing column 18 and the No. 2 packing column 19. The packing inside the packing column is filled in advance according to the average particle size d 50≤ In the activated carbon screened with 5mm, the first inner plate 25 and the second inner plate 26 are located at Figure 2 Location.

[0169] Secondly, when the recharging is carried out for 120 minutes, turn off the No. 1 filling water pump 21 and the No. 2 recharging water pump 22, and turn on the No. 1 clean water pump 23 and the No. 2 clean water pump 24 at the same time, with a flow rate of 3000ml / min, and perform 10s of backwashing.

[0170] Then, when the recharging process reaches 500 minutes, turn off the No. 1 recharging pump 21 and the No. 2 recharging pump 22, turn on the No. 1 motor 29 and the No. 2 motor 30, move the No. 1 inner plate 25 and the No. 2 inner plate 26 to the position shown in Figure b, operate the No. 1 thruster 27 and the No. 2 thruster 28 to push the filler out of the wellhead, and move the two thrusters to the position shown in Figure b. Figure 4 Position, it can be recycled after being taken out from the wellhead and flushed.

[0171] Finally, the experiment proved that this method can ensure the continuous recharge of clean mine water for 360 days. Through the sampling analysis of the monitoring well, the water turbidity was ≤5NTU, COD was reduced to 12mg / L, and Ca 2+ Reduced to 140mg / L, Mg 2+ It is 101mg / L.

Claims

1. A mine water pretreatment system, comprising a movable base (16), characterized in that: The base (16) is provided with a sample collector (13), a data collector (12) and a mine water collection box (10) respectively; a quartz sand column (1) is fixed on the side wall of the base (16); the bottom of the quartz sand column (1) is connected to the sample collector (13); a plurality of pressure sensors (2) are provided on the side wall of the quartz sand column (1); the plurality of pressure sensors are electrically connected to the data collector (12); the top of the quartz sand column 1 is connected to a coagulation test agitator (6) via a first branch pipe; a metering pump (7) and a dosing system (8) are fixed on the side wall of the base (16); the metering pump (7) is connected to the coagulation test agitator (6) and the mine water collection box (10) respectively; the dosing system (8) is connected to the coagulation test agitator (6); a first valve (15) is provided between the quartz sand column (1) and the sample collector (13); The first branch pipe is provided with a second valve (3), a first rotor flowmeter (4) and a turbidity meter (5) in sequence; a second rotor flowmeter (9) is provided between the metering pump (7) and the mine water collection box (10); The data collector (12) is connected to an external computer (11).

2. The mine water pretreatment system according to claim 1, characterized in that: A pulley (14) is provided at the bottom of the base.

3. The mine water pretreatment system according to claim 1, characterized in that: The mine water collection box (10) is provided with a magnetic stirrer (17).

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

5. An artificial recharge system, characterized in that: The invention comprises a mine water tank (32) arranged outside a U-shaped recharge well and a first packing column (18) and a second packing column (19) arranged on the inner wall of the U-shaped recharge well, wherein the mine water tank (32) is connected to the mine water collecting box (10) and the first packing column (18) and the second packing column (19) respectively, and a first recharge water pump (20) and a second recharge water pump (21) are respectively arranged between the first packing column (18) and the second packing column (19) and the mine water tank (32); a first thruster (27) and a second thruster (28) are correspondingly arranged on the inner wall of the U-shaped recharge well at the bottom of the first packing column (18) and the second packing column (19); A pair of symmetrical partitions (31) are prefabricated on the inner wall of the U-shaped reinjection well. A first inner plate (25) and a second inner plate (26) are arranged at the bottom of the pair of partitions (31); the first inner plate (25) and the second inner plate (26) are respectively arranged between the first packing column (18) and the first propeller (27) and between the second packing column (19) and the second propeller (28); the first inner plate and the second inner plate are respectively connected to a first motor (29) and a second motor (30). A clean water tank (22) is arranged outside the U-shaped recharging well, the clean water tank (22) is communicated with the inside of the U-shaped recharging well, and a first clean water pump (23) and a second clean water pump (24) are arranged between the clean water tank (22) and the U-shaped recharging well; Gravel, coarse sand, fine sand, artificial zeolite and CaCl2 with different particle sizes are preset on the inner wall of the U-shaped recharge well.

6. A method for artificial recharging of mine water, characterized in that: Based on the mine water pretreatment system according to any one of claims 1 to 4 and the artificial recharge system according to claim 5, the method specifically comprises the following steps: Step 1, judging the water quality of the mine water in the mine water collection box, if it is mine water containing suspended matter, then proceed to step 2, if it is mine water containing organic matter, then proceed to step 3, if it is mine water containing hardness, then proceed to step 4; if it is clean mine water, then proceed to step 5; Step 2 specifically includes the following steps: Step 2.1, open the first valve (15) and the second valve (3), transport the mine water in the data acquisition device to the dosing system, and use a turbidity meter (5) to test the turbidity of the mine water to obtain a NTU turbidity of the water body, a>0; 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; in: x represents the turbidity of water; b represents the dosage of polyaluminium chloride; c represents the dosage of polyacrylamide; t represents the backwash cycle; 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, respectively, to obtain b, c and t, and add b mg / L polyaluminium chloride and c mg / L polyacrylamide to the dosing system respectively; Step 2.4, adjusting the rotation speed of the coagulation test stirrer (6), stirring at a speed of 150 rpm for 3 min, stirring at a speed of 50 rpm for 10 min, and letting it stand for 15 min; Step 2.5, using a turbidity monitor (5) to detect whether the turbidity meets the standard, if yes, proceed to step 2.6, otherwise, respectively adjust the dosage of polyaluminium chloride and polyacrylamide and the hydraulic conditions, add a flocculant in the coagulation test stirrer (6) to destabilize and coagulate the colloidal particles, so that the particles originally less than 50 μm are coagulated into suspended matter larger than 300 μm, and then settle; The hydraulic condition is flow rate; Step 2.6, turning on the No. 1 recharging water pump (20) and the No. 2 recharging water pump (21) to transfer the supernatant in the mine water collection tank to the No. 1 packing column (18) and the No. 2 packing column (19); Step 2.7, when the recharging reaches the first preset time, the first recharging water pump (20) and the second recharging water pump (21) are turned off by opening and closing, and the first clean water pump (23) and the second clean water pump (24) are turned on at the same time, with a flow rate of 2000 ml / min, to perform backwashing for t seconds; and then continue the recharging; Step 2.8, when the recharging reaches the second preset time, turn off the No. 1 recharging water pump (20) and the No. 2 recharging water pump (21), turn on the No. 1 motor (29) and the No. 2 motor (30), move the No. 1 inner plate (25) and the No. 2 inner plate (26) radially inward until the No. 1 inner plate (25) and the No. 2 inner plate (26) are in contact; 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) out of the wellhead, take them out from the wellhead, rinse them and use them again; The step three specifically includes the following steps: Step 3.1, open the first valve (15) and the second valve (3), transfer the mine water in the data acquisition device to the dosing system, and use a TOC meter to test and obtain a TOC value of 1 mg / L in the mine water; 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 backwashing cycle fitting formula t1=-0.58In(y)+4.42; in: y represents water body TOC; b1 represents the dosage of polyaluminium chloride; c1 represents the dosage of polyacrylamide; t1 represents the backwash cycle; Step 3.3, input the water body TOC obtained in step 3.1 into the PAC fitting formula b1=0.34In(y)-1.01, PAM fitting formula c1=0.01n(y)-0.01 and backwashing cycle fitting formula t1=-0.58In(y)+4.42 obtained in step 3.2, to obtain b1, c1 and t1, and add b1 mg / L polyaluminium chloride and c1 mg / L polyacrylamide to the dosing system respectively; Step 3.4, adjusting the rotation speed of the coagulation test stirrer (6), stirring at a speed of 150 rpm for 5 min, stirring at a speed of 50 rpm for 8 min, and standing for 20 min; Step 3.5, measuring at the output end of the coagulation test stirrer (6) to determine whether the TOC of the water body meets the standard, if yes, proceed to step 3.6, otherwise, respectively adjust the dosage of polyaluminium chloride and polyacrylamide and the hydraulic conditions, add flocculant in the coagulation test stirrer (6) to destabilize and coagulate the colloidal particles, so that the particles originally with a particle size of less than 50 μm are coagulated into suspended matter larger than 300 μm, and then settle; The hydraulic condition is flow rate; Step 3.6, turning on the No. 1 recharging water pump (20) and the No. 2 recharging water pump (21) to transfer the supernatant in the mine water collection tank to the No. 1 packing column (18) and the No. 2 packing column (19); Step 3.7, when the recharging reaches the third preset time, the first recharging water pump (20) and the second recharging water pump (21) are turned off by opening and closing, and the first clean water pump (23) and the second clean water pump (24) are turned on at the same time, with a flow rate of 2000 ml / min, to perform backwashing for t1 seconds; and then continue the recharging; Step 3.8, when the reinjection reaches the fourth preset time, turn off the No. 1 reinjection water pump (20) and the No. 2 reinjection water pump (21), turn on the No. 1 motor (29) and the No. 2 motor (30), move the No. 1 inner plate (25) and the No. 2 inner plate (26) radially inward until the No. 1 inner plate (25) and the No. 2 inner plate (26) are in contact; 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) out of the wellhead, take them out from the wellhead, rinse them and use them again; The step 4 specifically includes the following steps: Step 4.1, open the first valve (15) and the second valve (3), transfer the mine water in the data acquisition device to the dosing system, and use the titration method to test the hardness of the mine water to be a2 mg / L; 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; in: z represents the hardness of water; b2 represents the dosage of polyaluminium chloride; c2 represents the dosage of polyacrylamide; t2 represents the backwash cycle; Step 4.3, input the water hardness obtained in step 4.1 into the PAC fitting formula b2=1.7In(z)-5.05, PAM fitting formula c2=0.05n(z)-0.05 and backwashing cycle fitting formula t2=-2.9In(z)+22.1 obtained in step 4.2, respectively, to obtain b2, c2 and t2, and add b2 mg / L polyaluminium chloride and c2 mg / L polyacrylamide to the dosing system respectively; Step 4.4, adjusting the rotation speed of the coagulation test stirrer (6), stirring at a speed of 150 rpm for 3 min, stirring at a speed of 50 rpm for 12 min, and letting it stand for 15 min. Step 4.5, testing the water hardness at the tail end of the coagulation test stirrer (6) to determine whether the water hardness meets the standard. If yes, proceed to step 4.

6. Otherwise, respectively adjust the dosage of polyaluminium chloride and polyacrylamide and the hydraulic conditions. Add flocculant to the coagulation test stirrer (6) to destabilize and coagulate the colloidal particles, so that the particles originally smaller than 50 μm are coagulated into suspended matter larger than 300 μm, and then settle. The hydraulic condition is flow rate; Step 4.6, turning on the No. 1 recharging water pump (20) and the No. 2 recharging water pump (21) to transfer the supernatant in the mine water collection tank to the No. 1 packing column (18) and the No. 2 packing column (19); Step 4.7, when the recharging reaches the fifth preset time, the first recharging water pump (20) and the second recharging water pump (21) are turned off by opening and closing, and the first clean water pump (23) and the second clean water pump (24) are turned on at the same time, with a flow rate of 2000 ml / min, to perform backwashing for t2 seconds; and then continue the recharging; Step 4.8, when the recharging reaches the sixth preset time, turn off the No. 1 recharging water pump (20) and the No. 2 recharging water pump (21), turn on the No. 1 motor (29) and the No. 2 motor (30), move the No. 1 inner plate (25) and the No. 2 inner plate (26) radially inward until the No. 1 inner plate (25) and the No. 2 inner plate (26) are in contact; 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) out of the wellhead, take them out from the wellhead, rinse them and use them again; The step five specifically includes the following steps: Step 5.1, turn on the No. 1 recharging water pump (20) and the No. 2 recharging water pump (21) to transfer the supernatant in the mine water collection tank to the No. 1 packing column (18) and the No. 2 packing column (19); Step 5.2, when the recharging reaches the seventh preset time, the first recharging water pump (20) and the second recharging water pump (21) are turned off by opening and closing, and the first clean water pump (23) and the second clean water pump (24) are turned on at the same time, with a flow rate of 2000 ml / min, and a backwashing for 15 seconds is performed; and then the recharging is continued; Step 5.3, when the reinjection reaches the eighth preset time, turn off the No. 1 reinjection water pump (20) and the No. 2 reinjection water pump (21), turn on the No. 1 motor (29) and the No. 2 motor (30), move the No. 1 inner plate (25) and the No. 2 inner plate (26) radially inward until the No. 1 inner plate (25) and the No. 2 inner plate (26) are in contact; 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) out of the wellhead, take them out from the wellhead and rinse them for reuse.

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