Coal mine drainage water treatment system

Abstract

According to the coal mine drainage water treatment system provided by the invention, oil removal and pre-precipitation treatment are carried out on drainage water by arranging the horizontal flow sedimentation tank, then the pretreated drainage water and the flocculation agent are mixed in the pipeline mixer, and then the mixture is input into the flocculation tank for flocculation treatment, so that supernate with relatively low turbidity is obtained; the supernatant obtained after flocculation is transferred into a filter to be filtered, so that the cleanliness of the supernatant is further improved, and the filtered clear water is temporarily stored in a recycling water tank and then is distributed to water equipment through a third water pump to be utilized. According to the device, coal mine drainage water is recycled after being preliminarily cleaned through cooperative use of the equipment, waste of water resources is effectively reduced, and meanwhile the beneficial effect of reducing pollution is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a coal mine drainage water treatment system. Background Art

[0002] Drainage water refers to wastewater containing various pollutants that emerges from groundwater in coal seams during the mining process. The composition of drainage water is influenced by the region's hydrological and geological characteristics, as well as mining processes. It is generally complex, containing large amounts of suspended solids such as sand, gravel, coal, and grease, as well as dissolved salts, acids, and bases. This wastewater is large in volume, has complex quality, and exhibits significant fluctuations in both quality and quantity. Direct discharge without treatment not only wastes water resources but also pollutes the environment. Therefore, it is essential to treat drainage water to avoid wasting resources and polluting the environment. Utility Model Content

[0003] The present application provides a coal mine drainage water treatment system to solve the problem of water resource and environmental pollution caused by the direct discharge of the above-mentioned coal mine drainage water.

[0004] The present application provides a coal mine drainage water treatment system, comprising a pipeline mixer, a flocculation tank, an intermediate water tank, a filter, a recycled water tank and water equipment connected in series with a drainage water discharge pipeline;

[0005] A first water pump is provided between the drain water discharge pipeline and the pipeline mixer;

[0006] A second water pump is provided between the intermediate water tank and the filter;

[0007] A third water pump is provided between the recycled water pool and the water-using equipment;

[0008] The pipeline mixer is also connected to the dosing metering pump;

[0009] A horizontal flow sedimentation tank is also provided between the first water pump and the pipeline mixer.

[0010] Optionally, the recycled water pool is further connected to the ultrafiltration reverse osmosis system and the fresh water pool in sequence through a fourth water pump.

[0011] Optionally, both the flocculation tank and the advection sedimentation tank are connected to the sludge tank;

[0012] The sludge pool is connected to the sludge thickening tank and the filter press in sequence, and the sludge pool, the sludge thickening tank and the filter press are all connected to the wastewater pool;

[0013] The filter is also connected to the wastewater tank;

[0014] The wastewater pool is also connected to the horizontal flow sedimentation tank.

[0015] Optionally, the flocculation tank includes a turbulent reaction zone, a sedimentation zone and a water production zone separated by partitions;

[0016] A first overflow port is provided on the partition between the turbulent reaction zone and the precipitation zone;

[0017] A second overflow port is provided on the partition between the sedimentation area and the water production area;

[0018] An inclined plate is provided on the side of the sedimentation area close to the water production area, and the inclined plate is arranged to be inclined downward from the side close to the water production area to the side close to the sedimentation area.

[0019] Optionally, an oil scraping device is further provided on the advection sedimentation tank;

[0020] The oil scraping device is arranged above the horizontal flow sedimentation tank, and the oil scraping device can move back and forth horizontally along the side of the horizontal flow sedimentation tank it is close to. The terminal end of the oil scraping device is provided with an oil skimming device.

[0021] Optionally, the oil scraping device includes guide rails arranged in parallel on both sides of the horizontal flow sedimentation tank and moving devices on both sides matching the guide rails;

[0022] The moving device is connected to the telescopic support frame through a base, and the support frames on both sides are connected through a scraper.

[0023] Optionally, the oil skimming device includes a suction pump and a cantilever mounted on a mobile trolley, the other end of the cantilever being connected to the oil skimming hopper;

[0024] The oil skimmer is connected to the suction pump through a flexible hose, and the output end of the suction pump is connected to the waste oil collection tank through a pipeline.

[0025] The coal mine drainage water treatment system provided by the present application is to remove oil and pre-precipitate the drainage water by setting up a horizontal flow sedimentation tank, then mix the pre-treated drainage water with a flocculant in a pipeline mixer, and then input it into a flocculation tank for flocculation treatment to obtain a supernatant with low turbidity. The supernatant obtained after flocculation is then transferred to a filter for filtration to further improve the cleanliness of the supernatant, and the filtered clean water is temporarily stored in a reuse water tank, and then distributed to water-using equipment for use through a third water pump. The device of the present application uses the above-mentioned equipment in conjunction with the preliminary cleaning of the coal mine drainage water and then recycles it, effectively reducing the waste of water resources and also having the beneficial effect of reducing pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 A schematic diagram of a coal mine drainage water treatment system provided in one embodiment of the present application;

[0028] Figure 2 A schematic diagram of a coal mine drainage water treatment system provided in another embodiment of the present application;

[0029] Figure 3 A schematic diagram of a coal mine drainage water treatment system provided in yet another embodiment of the present application;

[0030] Figure 4 A schematic diagram of the structure of a flocculation tank provided in one embodiment of the present application;

[0031] Figure 5 This is a schematic diagram of the main structure of a horizontal flow sedimentation tank provided in one embodiment of the present application;

[0032] Figure 6 A schematic diagram of the three-dimensional structure of a horizontal flow sedimentation tank provided in one embodiment of the present application;

[0033] Figure 7 A schematic diagram of the three-dimensional structure of a horizontal flow sedimentation tank provided in one embodiment of the present application from one angle;

[0034] Figure 8 This is a schematic diagram of the three-dimensional structure of the horizontal flow sedimentation tank provided in one embodiment of the present application from another angle.

[0035] Description of reference numerals:

[0036] 1. Drainage water discharge pipeline; 2. Pipeline mixer; 3. Flocculation tank; 4. Intermediate water tank; 5. Filter; 6. Recycled water tank; 7. Water equipment; 8. Horizontal sedimentation tank; 9. Ultrafiltration and reverse osmosis system; 10. First water pump; 11. Sludge tank; 12. Sludge thickening tank; 13. Filter press; 14. Wastewater tank; 20. Dosing pump; 31. Partition; 32. Turbulent reaction zone; 33. Sedimentation zone; 34. Water production zone; 35. Inclined plate; 4 0. Second water pump; 60. Third water pump; 81. Oil scraping device; 82. Oil skimming device; 83. Waste oil collecting tank; 90. Fourth water pump; 91. Fresh water tank; 301. First overflow port; 302. Second overflow port; 811. Guide rail; 812. Moving device; 813. Base; 814. Support frame; 815. Scraper; 821. Moving trolley; 822. Suction pump; 823. Cantilever; 824. Oil skimmer; 825. Flexible hose. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of this application.

[0038] like Figure 1 As shown, the present application provides a coal mine drainage water treatment system, comprising a pipeline mixer 2, a flocculation tank 3, an intermediate water tank 4, a filter 5, a recycled water tank 6 and a water-using device 7 connected in series with a drainage water discharge pipeline 1;

[0039] A first water pump 10 is provided between the drain water discharge pipeline 1 and the pipeline mixer 2;

[0040] A second water pump 40 is provided between the intermediate water tank 4 and the filter 5;

[0041] A third water pump 60 is provided between the reuse water pool 6 and the water-using equipment 7;

[0042] The pipeline mixer 2 is also connected to the dosing metering pump 20;

[0043] A horizontal flow sedimentation tank 8 is further provided between the first water pump 10 and the pipeline mixer 2 .

[0044] During use, the drain water discharged from the drain water discharge pipeline 1 is sucked and pressurized by the first water pump 10 and then transferred to the horizontal flow sedimentation tank 8 for pre-sedimentation and oil removal treatment (because the drain water is mixed with grease and hydrocarbon compounds, these impurities float on the liquid surface to form a grease layer).

[0045] After the drained water is degreased and pre-precipitated in the horizontal flow sedimentation tank 8, it is evenly mixed with the flocculation agent (in this application, polyacrylamide, polyaluminum chloride, etc.) added by the dosing metering pump 20 in the pipeline mixer 2. The drained water mixed with the agent flows into the flocculation tank 3 for accelerated coagulation and precipitation.

[0046] The flocculated clean water flows into the intermediate water tank 4 for buffering. The clean water in the intermediate water tank 4 is then transferred to the filter 5 by the second water pump 40 for filtration. The filter in this application is a high-efficiency fiber ball filter. The filtered clean water is transferred to the recycling water tank 6 and then transferred to the water-using equipment 7 (such as the desulfurization process water tank of a power plant, the dust removal and spraying equipment in a coal mine, and other equipment with low water quality requirements) for utilization by the third water pump 60.

[0047] The coal mine drainage water treatment system provided by the present application removes oil and pre-precipitates the drainage water by setting up a horizontal flow sedimentation tank 8. The pre-treated drainage water is then mixed with a flocculant in a pipeline mixer 2 and input into a flocculation tank 3 for flocculation treatment to obtain a supernatant with low turbidity. The supernatant obtained after flocculation is then transferred to a filter 5 for filtration to further improve the cleanliness of the supernatant. The filtered clean water is temporarily stored in a reuse water tank 6 and then distributed to a water-using device 7 for utilization by a third water pump 60. The device of the present application, through the coordinated use of the above-mentioned equipment, recycles the coal mine drainage water after preliminary cleaning, effectively reducing the waste of water resources and also having the beneficial effect of reducing pollution.

[0048] like Figure 2 As shown, optionally, the reuse water pool 6 is further connected to the ultrafiltration reverse osmosis system 9 and the fresh water pool 91 in sequence through a fourth water pump 90 .

[0049] In this application, when the clean water needs to be reused in an environment with high water quality requirements (such as water for steam production), the clean water needs to be transferred to the ultrafiltration reverse osmosis system 9 for reverse osmosis and other membrane filtration methods to further purify the clean water, and the purified fresh water is transferred to the fresh water tank 91 for temporary storage.

[0050] like Figure 3 As shown, optionally, the flocculation tank 3 and the advection sedimentation tank 8 are both connected to the sludge tank 11;

[0051] The sludge tank 11 is connected to the sludge thickening tank 12 and the filter press 13 in sequence, and the sludge tank 11, the sludge thickening tank 12 and the filter press 13 are all connected to the wastewater tank 14;

[0052] The filter 5 is also connected to the wastewater tank 14;

[0053] The wastewater tank 14 is also connected to the horizontal flow sedimentation tank 8.

[0054] The sludge deposited in flocculation tank 3 and advection sedimentation tank 8 is transferred to sludge tank 11. The sludge slurry in sludge tank 11 is then transferred to sludge thickening tank 12 for sedimentation and concentration. The concentrated sludge is then transferred to filter press 13 for filtration. The filtrate obtained from the filtration is combined with the supernatant from sludge tank 11 and sludge thickening tank 12 and transferred to wastewater tank 14. The filter cake obtained from the filtration is transported to the coal yard. The filter wastewater in wastewater tank 14 is again transferred to advection sedimentation tank 8 for the next round of treatment.

[0055] The filter 5 will become clogged after working for a period of time, and it needs to be backwashed to clear it. The backwash water in this process contains a large amount of dirt, which is also transferred to the wastewater tank 14 for temporary storage.

[0056] like Figure 4 As shown, optionally, the flocculation tank 3 includes a turbulent reaction zone 32, a sedimentation zone 33 and a water production zone 34 separated by a partition 31;

[0057] A first overflow port 301 is provided on the partition 31 between the turbulent reaction zone 32 and the precipitation zone 33;

[0058] A second overflow port 302 is provided on the partition 31 between the sedimentation area 33 and the water production area 34;

[0059] An inclined plate 35 is provided on a side of the sedimentation area 33 close to the water production area 34 . The inclined plate 35 is arranged to be inclined downward from a side close to the water production area 34 to a side close to the sedimentation area 33 .

[0060] In the present application, when in use, the drained water first flows into the turbulent reaction zone 32 (a stirring device is provided in the turbulent reaction zone 32) for stirring during flocculation and sedimentation, so that the flocculant adsorbs more dirt particles and agglomerates them. The stirred drained water then overflows to the sedimentation zone 33 through the first overflow port 301 for sedimentation, and the settled supernatant overflows to the water production zone 34 through the second overflow port 302, and the settled sludge is transferred to the sludge pool 11; the inclined plate 35 provided in the sedimentation zone 33 is provided with a protrusion perpendicular to the water flow direction, which can reduce the flocculent particles in the supernatant from flowing into the water production zone 34, and the clean water output from the water production zone 34 flows into the intermediate water pool 4 for buffering.

[0061] like Figure 5 As shown, optionally, an oil scraping device 81 is further provided on the horizontal flow sedimentation tank 8;

[0062] The oil scraping device 81 is arranged across the top of the horizontal flow sedimentation tank 8. The oil scraping device 81 can move back and forth horizontally along the side of the horizontal flow sedimentation tank 8 it is close to. The terminal end of the movement of the oil scraping device 81 is provided with an oil skimming device 82.

[0063] In the present application, the reciprocating scraping device 81 can scrape the grease on the surface of the drained water to the side close to the skimming device 82, and then the skimming device 82 can skim off the accumulated grease to achieve the degreasing of the drained water.

[0064] like Figures 6 to 8 As shown, optionally, the oil scraping device 81 includes guide rails 811 arranged in parallel on both sides of the horizontal flow sedimentation tank 8 and moving devices 812 on both sides matching the guide rails 811;

[0065] The moving device 812 is connected to the retractable support frame 814 via a base 813 , and the support frames 814 on both sides are connected via a scraper 815 .

[0066] At this time, the scraper 815 can be lifted off the liquid surface by adjusting the height of the support frame 814, and the oil scraping device 81 can be moved to the end away from the oil skimming device 82 by the moving device 812 (the moving device 812 can be, for example, a slider, pulley or other structure that matches the guide rail 811, and the moving device 812 can be driven by a corresponding power device such as a motor (it can also be moved by the operator). At this time, the height of the support frame 814 is adjusted again to lower the scraper 815 to a position suitable for scraping the grease layer, and then the oil scraping device 81 is driven by the moving device 812 to move slowly and uniformly toward one end of the oil skimming device 82 to scrape the grease layer. The oil scraping device 81 stops when it scrapes the grease layer to a position close to the oil skimming device 82 to prevent the grease layer from spreading again.

[0067] like Figures 6 to 8 As shown, optionally, the oil skimming device 82 includes a suction pump 822 and a cantilever 823 mounted on a mobile trolley 821, and the other end of the cantilever 823 is connected to the oil skimming bucket 824;

[0068] The skimmer 824 is connected to the suction pump 822 via a flexible hose 825 , and the output end of the suction pump 822 is connected to the waste oil collection tank 83 via a pipeline.

[0069] When in use in the present application, when the scraper device 81 scrapes the grease and gathers it on the side close to the skimming device 82, the grease layer is collected into the skimming bucket 824 by adjusting the height of the cantilever 823, and at the same time, the suction pump 822 is turned on to suck the grease in the skimming bucket 824 through the flexible hose 825 and discharge it into the waste oil collection tank 83.

[0070] This application provides a coal mine drainage water treatment system, the working process of which is as follows:

[0071] During use, the drained water discharged from the drained water discharge pipeline 1 is sucked and pressurized by the first water pump 10 and then transferred to the horizontal flow sedimentation tank 8 for pre-sedimentation and oil removal treatment (because the drained water is mixed with grease and hydrocarbon compounds, these impurities float on the liquid surface to form a grease layer). As the drained water flows into the horizontal flow sedimentation tank 8 for treatment, the flow rate decreases and gradually forms a horizontal flow. The grease, hydrocarbons, etc. in the drained water gradually float up to form a grease layer under such low turbulence conditions. At this time, the scraper 815 can be raised away from the liquid surface by adjusting the height of the support frame 814, and the oil scraping device 81 can be moved to a position away from the oil skimming device 82 through the moving device 812 (the moving device 812 is, for example, a slider, pulley, etc. that matches the guide rail 811, and the moving device 812 can be driven by a corresponding power device such as a motor, etc., or can be moved by the operator). At one end, the height of the support frame 814 is adjusted to lower the scraper 815 to a position suitable for scraping the grease layer. The moving device 812 then drives the scraper 81 to move slowly and uniformly toward one end of the skimmer 82, scraping the grease layer. The scraper 81 stops when it reaches a position close to the skimmer 82 to prevent the grease layer from spreading again. The height of the cantilever 823 is then adjusted to collect the grease layer into the skimmer 824. At the same time, the suction pump 822 is turned on to suck the grease from the skimmer 824 through the flexible hose 825 and discharge it into the waste oil collection tank 83. While scraping the oil, the drained water is also settling, and the settled dirt is transferred to the sludge tank 11 for centralized treatment.

[0072] After the drained water is degreased and pre-precipitated in the horizontal flow sedimentation tank 8, it is evenly mixed with the flocculation agent (in this application, polyacrylamide, polyaluminum chloride, etc.) added by the dosing metering pump 20 in the pipeline mixer 2. The drained water mixed with the agent flows into the flocculation tank 3 for accelerated coagulation and precipitation.

[0073] When the drained water is undergoing flocculation and sedimentation, it first flows into the turbulent reaction zone 32 (a stirring device is provided in the turbulent reaction zone 32) for stirring, so that the flocculant adsorbs more dirt particles and agglomerates them. Then, the stirred drained water overflows through the first overflow port 301 to the sedimentation zone 33 for sedimentation. The settled supernatant overflows to the water production area through the second overflow port 302, and the settled sludge is transferred to the sludge pool 11; the inclined plate 35 provided in the sedimentation area 33 is provided with a protrusion perpendicular to the water flow direction, which can reduce the flocculated particles in the supernatant from flowing into the water production area 34. The flocculated clean water output from the water production area 34 flows into the intermediate water pool 4 for buffering. The clean water in the intermediate water tank 4 is then transferred to the filter 5 via a second water pump 40 for filtration. In this application, the filter is a high-efficiency fiber ball filter. The filtered clean water is then transferred to the reuse water tank 6. It is then transferred via a third water pump 60 to water-using equipment 7 (such as power plant desulfurization process water tanks, coal mine dust removal, spraying, and other equipment with low water quality requirements) for reuse. When the clean water needs to be reused in applications with high water quality requirements (such as steam production), it is transferred to an ultrafiltration and reverse osmosis system 9 for further purification using membrane filtration methods such as reverse osmosis. The purified fresh water is then temporarily stored in the fresh water tank 91.

[0074] The sludge slurry in sludge tank 11 is transferred to sludge thickening tank 12 for sedimentation and concentration. The concentrated sludge is then transferred to filter press 13 for filtration. The filtrate obtained from the filtration is combined with the supernatant from sludge tank 11 and sludge thickening tank 12 and transferred to wastewater tank 14. The filter cake is then transported to the coal yard. The filter press wastewater in wastewater tank 14 is then transferred to horizontal sedimentation tank 8 for the next round of treatment.

[0075] The filter 5 will become clogged after working for a period of time, and it needs to be backwashed to clear it. The backwash water in this process contains a large amount of dirt, which is also transferred to the wastewater tank 14 for temporary storage.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A coal mine drainage water treatment system, characterized in that: It includes a pipeline mixer (2), a flocculation tank (3), an intermediate water tank (4), a filter (5), a recycling water tank (6) and water-using equipment (7) connected in series with a drainage water discharge pipeline (1); A first water pump (10) is provided between the drain water discharge pipeline (1) and the pipeline mixer (2); A second water pump (40) is provided between the intermediate water tank (4) and the filter (5); A third water pump (60) is provided between the recycled water pool (6) and the water-using equipment (7); The pipeline mixer (2) is also connected to a dosing metering pump (20); A horizontal flow sedimentation tank (8) is further provided between the first water pump (10) and the pipeline mixer (2); The flocculation tank (3) includes a turbulent reaction zone (32), a sedimentation zone (33) and a water production zone (34) separated by a partition (31); A first overflow port (301) is provided on the partition (31) between the turbulent reaction zone (32) and the sedimentation zone (33); A second overflow port (302) is provided on the partition (31) between the sedimentation area (33) and the water production area (34); An inclined plate (35) is provided on a side of the sedimentation area (33) close to the water production area (34), and the inclined plate (35) is arranged to be inclined downward from a side close to the water production area (34) to a side close to the sedimentation area (33).

2. The coal mine drainage water treatment system according to claim 1, characterized in that: The recycled water pool (6) is also connected to the ultrafiltration reverse osmosis system (9) and the fresh water pool (91) in sequence via a fourth water pump (90).

3. The coal mine drainage water treatment system according to claim 1, characterized in that: The flocculation tank (3) and the horizontal flow sedimentation tank (8) are both connected to the sludge tank (11); The sludge pool (11) is connected to the sludge concentration pool (12) and the filter press (13) in sequence, and the sludge pool (11), the sludge concentration pool (12) and the filter press (13) are all connected to the wastewater pool (14); The filter (5) is also connected to a wastewater tank (14); The wastewater tank (14) is also connected to the horizontal flow sedimentation tank (8).

4. The coal mine drainage water treatment system according to claim 1, characterized in that: The horizontal flow sedimentation tank (8) is also provided with an oil scraping device (81); The oil scraping device (81) is arranged above the horizontal flow sedimentation tank (8). The oil scraping device (81) can move back and forth horizontally along the side of the horizontal flow sedimentation tank (8) to which it is close. The terminal end of the movement of the oil scraping device (81) is provided with an oil skimming device (82).

5. The coal mine drainage water treatment system according to claim 4, characterized in that: The oil scraping device (81) comprises guide rails (811) arranged in parallel on both sides of the horizontal flow sedimentation tank (8) and moving devices (812) on both sides matching the guide rails (811); The moving device (812) is connected to a retractable support frame (814) via a base (813), and the support frames (814) on both sides are connected via a scraper (815).

6. The coal mine drainage water treatment system according to claim 5, characterized in that: The oil skimming device (82) includes a suction pump (822) and a cantilever (823) mounted on a mobile trolley (821), and the other end of the cantilever (823) is connected to an oil skimming bucket (824); The oil skimmer (824) is connected to the suction pump (822) via a flexible hose (825), and the output end of the suction pump (822) is connected to the waste oil collection tank (83) via a pipeline.

Images