Device and method for purifying and recycling underground coal mine wastewater

Abstract

The invention relates to the technical field of coal mine underground wastewater treatment, in particular to a coal mine underground wastewater purifying and recycling device which comprises a base, the upper side of the base is fixedly connected with a flocculation tank, a settling tank, an aeration tank and a water filtering tank through a plurality of supporting legs in sequence from front to back, and the front side of the flocculation tank is fixedly connected with a main water pipe; a solid-liquid separation assembly used for conducting primary separation on impurities of the coal mine wastewater is arranged inside and outside the flocculation tank and the settling tank jointly, and a secondary filtering mechanism used for conducting secondary filtering on the separated wastewater is arranged inside and outside the aeration tank and the water filtering tank jointly. The coal mine wastewater is subjected to multi-stage filtration treatment in a process step-by-step treatment mode, and organic and inorganic impurities in the coal mine wastewater can be effectively removed, so that the discharge cleanliness of the coal mine wastewater is ensured, and the recycling safety of the coal mine wastewater is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine underground wastewater treatment, and particularly relates to a device and method for purifying and recycling coal mine underground wastewater. Background Art

[0002] Coal mine underground wastewater mainly refers to various wastewater generated during the coal mining process. The characteristics of this kind of wastewater are that it contains relatively high minerals and metal ions. In the actual mining area environment, especially when the layout of the mining area worker living area and the production area is relatively compact, there may be a situation where coal mine underground wastewater and coal mine domestic sewage are mixed. Coal mine domestic sewage is mainly the sewage formed in the lives of the mining area staff. This kind of wastewater is not much different from urban domestic sewage, and the main pollutants are organic impurities.

[0003] A coal mine underground wastewater purification and recycling device is a device specifically used to treat coal mine wastewater to meet the standard for reuse. This kind of device is of great significance for reducing the impact of coal mining on the environment and improving the utilization rate of water resources.

[0004] In the invention patent with the Chinese patent publication number CN117339300B, a wastewater recycling device for coal mine underground tunneling operations is mentioned, including a base, a primary filter barrel, a secondary filter barrel, and a fine filter barrel; a primary filter structure is installed in the primary filter barrel, and the primary filter structure includes a filter cylinder. A first baffle is installed in the primary filter barrel, a support ring is slidably installed in the middle of the first baffle, and the filter cylinder is rotatably installed on the support ring; a secondary filter structure is installed in the secondary filter barrel, and the secondary filter structure includes a filter cloth arranged in a U shape in the secondary filter barrel. A traction structure is installed in the secondary filter barrel, and the traction structure is respectively connected to both ends of the filter cloth; multiple groups of scrapers that sandwich the inner and outer surfaces of the filter cloth are installed in the secondary filter barrel. This device can shorten the water supply and drainage processes, quickly complete the work of wastewater filtration and recycling, and significantly reduce the burden of water supply and wastewater purification during coal mine underground operations.

[0005] Although the device mentioned in this patent has a certain purification effect on coal mine underground wastewater, all three - stage filtrations are for visible solid impurities. However, coal mine underground wastewater is not a single inorganic wastewater. Since domestic sewage will also be mixed in coal mine underground wastewater, only removing inorganic impurities, the purified water still cannot be directly used. Organic substances will make the wastewater highly corrosive and emit an odor. After using the wastewater purified by this patent, the organic impurities in the wastewater will have an adverse impact on the environment. At the same time, this patent mostly filters through the action of filter cloth, the filtration technology is relatively backward, and the impurity removal effect needs to be improved. Summary of the Invention

[0006] Technical problem to be solved: A device and method for purifying and recycling underground coal mine wastewater provided by the present invention can solve the above-mentioned problems.

[0007] Technical solution: To achieve the above object, the present invention adopts the following technical solution. A device for purifying and recycling underground coal mine wastewater includes a base. On the upper side of the base, a flocculation tank, a sedimentation tank, an aeration tank, and a filtration tank are fixedly connected in sequence from front to back through a number of legs. A main water pipe is fixedly connected to the front side of the flocculation tank. A solid-liquid separation component for primary separation of impurities in coal mine wastewater is jointly arranged inside and outside the flocculation tank and the sedimentation tank. A secondary filtration mechanism for secondary filtration of the separated wastewater is jointly arranged inside and outside the aeration tank and the filtration tank.

[0008] The primary separation mechanism includes a chemical agent addition component arranged inside and at the top of the flocculation tank for adding flocculant and neutralizing agent to the wastewater. A water pump 1 is fixedly connected to the bottom of the flocculation tank. The input end and the output end of the water pump 1 are respectively communicated with the flocculation tank and the sedimentation tank through connecting pipes. A solid-liquid separation component for sedimentation of flocs is arranged inside the sedimentation tank. A floc discharge component for discharging the sedimented matter is jointly arranged at the bottom and the left side of the sedimentation tank.

[0009] The secondary filtration mechanism includes a filtration component arranged between the sedimentation tank and the aeration tank. An aeration component for aerating the wastewater is arranged inside the aeration tank. An ultrafiltration component for discharging available water is arranged inside the filtration tank.

[0010] By using the primary separation mechanism and the secondary filtration mechanism in cooperation, impurities in coal mine wastewater can be effectively removed, and available water sources can be discharged.

[0011] As a preferred technical solution of the present invention, the chemical agent addition component includes a motor 1 fixedly connected to the upper side of the flocculation tank. The output end of the motor 1 is fixedly connected to a bevel gear 1. The bevel gear 1 is meshed with a bevel gear 2. The center of the bevel gear 2 is fixedly connected with a hollow chemical agent distribution rod. The upper end of the chemical agent distribution rod is rotatably connected with a hollow chemical agent collecting box. The chemical agent collecting box is fixedly connected to the motor 1 through a fixing frame. The top of the chemical agent collecting box is communicated with two groups of chemical agent conveying pipes through pipelines. The two groups of chemical agent conveying pipes are respectively communicated with chemical agent tanks through pipelines. The chemical agent distribution rod rotates through to the inside of the flocculation tank. A number of L-shaped arms are fixedly connected to the part of the chemical agent distribution rod located inside the flocculation tank. An L-shaped branch pipe is integrally and fixedly connected to the middle of the L-shaped arm. The L-shaped branch pipe and the inside of the chemical agent distribution rod are communicated with each other. A number of one-way valves are installed on the L-shaped branch pipe.

[0012] As a preferred technical solution of the present invention, the solid-liquid separation component includes a plurality of overflow collection pipes arranged at equal distances along the left-right direction on the upper side inside the sedimentation tank. The left end of the overflow collection pipe is fixedly connected to the left side wall of the sedimentation tank. The rear end of the overflow collection pipe penetrates through the right side wall of the sedimentation tank and extends to the outside of the sedimentation tank. A plurality of water inlets are equidistantly arranged on the upper side of the overflow collection pipe. A plurality of equally spaced inclined sedimentation plates are arranged below the plurality of overflow collection pipes. The sedimentation plates are wavy plates. The lower ends of the plurality of sedimentation plates are commonly fixedly connected with a plurality of fixing rods distributed in the front-rear direction. The front and rear ends of the plurality of fixing rods are commonly fixedly connected with connecting plates, and the connecting plates are fixedly connected to the inner wall of the sedimentation tank.

[0013] As a preferred technical solution of the present invention, the floc discharge component includes a waste material conveying auger rotatably connected to the center of the bottom of the sedimentation tank. The waste material conveying auger is driven by a second motor. The second motor is fixedly connected to the outside of the sedimentation tank. An installation opening is provided at the center of the left side wall of the sedimentation tank. An external housing is fixedly connected to the outside of the installation opening. A waste material dewatering auger is rotatably connected inside the external housing. The pitch of the waste material dewatering auger gradually decreases from bottom to top. An arc-shaped filter screen is fixedly connected inside the installation opening. A filter cloth is attached to the arc-shaped filter screen. The inner wall of the arc-shaped filter screen is in sliding contact with the waste material dewatering auger. The waste material dewatering auger is driven by a third motor. The third motor is fixedly connected to the outside of the external housing. A floc outlet is provided on the upper left side of the external housing.

[0014] As a preferred technical solution of the present invention, the filtration component includes a first water delivery pipe connected to the rear ends of the respective overflow collection pipes through a pipeline. A plurality of second water delivery pipes are fixedly penetrated and arranged at equal distances along the left-right direction on the front side wall of the aeration tank. The first water delivery pipe and the second water delivery pipes are connected in one-to-one correspondence through a filter pipe. The filter pipes are vertically distributed and are sequentially filled with a sand filtration layer, an activated carbon filtration layer, and a microfiltration medium layer from top to bottom inside. A first short pipe is also connected to the first water delivery pipe through a pipeline. The first short pipes are commonly connected to a water outlet pipe, and the water outlet pipe is connected to an external collection system. A second short pipe is also connected to the second water delivery pipe through a pipeline. The second short pipes are commonly connected to a water inlet pipe, and the water inlet pipe is connected to an external water delivery system. Electric control valves are provided on the first water delivery pipe, the second water delivery pipes, the first short pipes, and the second short pipes.

[0015] As a preferred technical solution of the present invention, the aeration component includes an air inlet pipe fixedly connected to the bottom of the left and right side walls of the aeration tank. The upper side of the aeration tank is open and activated sludge is placed inside. One end of the air inlet pipe extends to the outside of the aeration tank and communicates with an external aeration device. A plurality of branch air pipes are equidistantly installed on the part of the air inlet pipe located inside the aeration tank. A plurality of air jet nozzles are installed on the branch air pipes. The air jet nozzles are in the shape of mushrooms. A plurality of inclined air outlet holes are provided on the lower side wall of the mushroom-shaped cover of the air jet nozzle.

[0016] As a preferred technical solution of the present invention, the ultrafiltration component includes a plurality of external pipes fixedly connected between the front and rear walls of the water filter box, the external pipes are located inside the water filter box and connected to the ultrafiltration pipes, the rear ends of the plurality of external pipes extend to the outside of the water filter box and are commonly connected to a collecting pipe, the lower center of the collecting pipe is connected to the input end of the second water pump through a pipeline, a cleaning component for quickly cleaning the surface of the ultrafiltration pipe is arranged on the periphery of the ultrafiltration pipe, and a mud return component for pumping the settled activated sludge into the aeration tank is arranged at the bottom of the water filter box.

[0017] As a preferred technical solution of the present invention, the cleaning component includes a plurality of scraper rings sleeved on the periphery of the ultrafiltration tube, and the plurality of scraper rings on the same ultrafiltration tube are fixedly connected to a connecting rod, and the rear ends of the plurality of connecting rods slide through the rear side wall of the water filter box and are fixedly connected to a traction plate, and the left and right ends of the traction plate are fixedly connected with connecting frames, and the connecting frames are fixedly connected to the output end of the electric push rod, and the electric push rod is fixedly connected to the outer wall of the water filter box.

[0018] As a preferred technical solution of the present invention, the mud return component includes a water pump three installed at the bottom of the filter tank, the input end of the water pump three is connected to a mud return pipe, the output pipe of the water pump three is connected to the aeration tank, and a through hole is opened on the mud return pipe.

[0019] The present invention also provides a method for purifying and recycling underground coal mine wastewater, which is implemented by using the above-mentioned underground coal mine wastewater purification and recycling device, and specifically includes the following steps:

[0020] Step 1: Input the wastewater into the flocculation tank through the main water pipe, add flocculants and neutralizers into the wastewater through the chemical adding component and mix them.

[0021] Step 2: The flocculated wastewater is input into the sedimentation tank through a pump, and the flocculants are settled by the solid-liquid separation component to remove most of the suspended matter and some organic matter, and then the water in the upper part of the sedimentation tank is transported to the filter component through the overflow collection pipe.

[0022] Step 3: Remove the residual suspended matter and colloidal substances through the filter tube, and input the filtered water into the aeration tank through the water pipe 2.

[0023] Step 4: Remove dissolved organic matter and part of ammonia nitrogen through aeration components.

[0024] Step 5: Use ultrafiltration components to intercept tiny particles, bacteria, viruses and difficult-to-degrade substances, and discharge clean water for recycling.

[0025] Beneficial effects:

[0026] 1. The primary separation mechanism adopted in the present invention can adopt a preliminary treatment scheme of "primary sedimentation adjustment + flocculation slow sedimentation" for mine wastewater. By adjusting the pH value of the wastewater and adding flocculants, most of the suspended solids and part of the organic pollutants are removed. By introducing multi-stage mechanical filtration technology and successively using sand filtration, carbon filtration and microfiltration media, the residual suspended solids and colloidal substances are removed.

[0027] 2. The secondary filtration mechanism adopted in the present invention can utilize the biological aeration treatment process. Through the aeration equipment, activated sludge is cultivated, and the dissolved organic pollutants and part of ammonia nitrogen are removed by the activated sludge. Through ultrafiltration technology for in-depth treatment, a filter membrane with extremely small pore size is used to intercept micro-particles, bacteria, viruses and refractory organic substances.

[0028] 3. The primary separation mechanism and the secondary filtration mechanism adopted in the present invention are used in combination, and the coal mine wastewater is subjected to multi-stage filtration treatment by means of step-by-step process treatment, which can effectively remove the organic and inorganic impurities in the coal mine wastewater, thereby ensuring the cleanliness of the discharged coal mine wastewater, being beneficial to the safety of the recycled use of the coal mine wastewater. The mine wastewater is reused in the internal production of the mine, ground sprinkler dust reduction, greening and other links, fully reflecting the reuse value of water resources. While achieving zero discharge of the mine wastewater, it can also effectively reduce the operation cost of the mine, providing strong support for the green transformation and sustainable development of the coal industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the drawings and embodiments.

[0030] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0031] Figure 2 is a three-dimensional sectional structural schematic diagram of the primary separation mechanism of the present invention.

[0032] Figure 3 is a partial three-dimensional unfolded structural schematic diagram of the floc discharge assembly of the present invention.

[0033] Figure 4 is the present invention Figure 2 is an enlarged structural schematic diagram of area A in

[0034] Figure 5 is a three-dimensional structural schematic diagram of the filter assembly of the present invention.

[0035] Figure 6 is a sectional connection structural schematic diagram of the first water delivery pipe, the second water delivery pipe and the filter pipe of the present invention.

[0036] Figure 7 is a three-dimensional sectional structural schematic diagram of the secondary filtration mechanism of the present invention.

[0037] Figure 8 It is a schematic cross-sectional structure diagram of the jet head of the present invention.

[0038] In the figure: 1. Base; 2. Primary separation mechanism; 21. Flocculation tank; 22. Chemical agent adding component; 221. Chemical agent tank; 222. Chemical agent distribution rod; 223. L-shaped branch pipe; 224. Check valve; 225. L-shaped support arm; 226. First water pump; 227. Connecting pipe; 228. First motor; 229. First bevel gear; 2210. Second bevel gear; 2211. Chemical agent collecting box; 2212. Chemical agent conveying pipe; 23. Sedimentation tank; 231. Installation opening; 24. Floc discharge component; 241. Second motor; 242. Waste conveying auger; 243. Third motor; 244. Waste dehydration auger; 245. Arc-shaped filter screen; 246. Outer shell; 2461. Floc discharge port; 25. Solid-liquid separation component; 251. Overflow collection pipe; 2511. Water inlet; 252. Sedimentation plate; 253. Connecting plate; 254. Fixed rod; 3. Secondary filtration mechanism; 31. Aeration tank; 32. Filtration component; 321. First water conveying pipe; 322. Filter pipe; 323. Second water conveying pipe; 324. Outlet pipe; 325. Inlet pipe; 33. Filter water tank; 34. Aeration component; 341. Air inlet pipe; 342. Air distribution pipe; 343. Jet head; 3431. Air outlet hole; 35. Ultrafiltration component; 351. Second water pump; 352. Ultrafiltration pipe; 353. Summarizing pipe; 354. Outer connecting pipe; 355. Cleaning component; 3551. Connecting frame; 3552. Electric push rod; 3553. Traction plate; 3554. Connecting rod; 3555. Scraping ring; 356. Return sludge component; 3561. Return sludge pipe; 3562. Third water pump; 4. Main water pipe. Specific embodiments

[0039] The following will describe the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the claims.

[0040] Refer to Figure 1 , a device and method for purifying and recycling coal mine wastewater underground, including a base 1. The upper side of the base 1 is fixedly connected with a flocculation tank 21, a sedimentation tank 23, an aeration tank 31, and a filter water tank 33 in sequence from front to back through a plurality of legs. A main water pipe 4 is fixedly connected to the front side of the flocculation tank 21. A solid-liquid separation component 25 for primarily separating impurities in coal mine wastewater is jointly arranged inside and outside the flocculation tank 21 and the sedimentation tank 23. A secondary filtration mechanism 3 for secondarily filtering the separated wastewater is jointly arranged inside and outside the aeration tank 31 and the filter water tank 33.

[0041] Refer to Figure 1 and Figure 2, the primary separation mechanism 2 includes a chemical agent adding component 22 disposed inside and at the top of the flocculation tank 21 for adding flocculant and neutralizing agent to the wastewater. A first water pump 226 is fixedly connected to the bottom of the flocculation tank 21. The input end and the output end of the first water pump 226 are respectively communicated with the flocculation tank 21 and the sedimentation tank 23 through a connecting pipe 227. A solid-liquid separation component 25 for sedimenting the flocs is disposed inside the sedimentation tank 23. A floc discharging component 24 for discharging the sedimented matter is jointly disposed at the bottom and the left side of the sedimentation tank 23.

[0042] Refer to Figure 1 and Figure 7 , the secondary filtration mechanism 3 includes a filtration component 32 disposed between the sedimentation tank 23 and the aeration tank 31. An aeration component 34 for aerating the wastewater is disposed inside the aeration tank 31. An ultrafiltration component 35 for discharging the available water is disposed inside the filtered water tank 33.

[0043] By using the primary separation mechanism 2 and the secondary filtration mechanism 3 in cooperation, the impurities in the coal mine wastewater can be effectively removed and the available water source can be discharged.

[0044] Refer to Figure 1 , Figure 2 and Figure 4 , the chemical agent adding component 22 includes a first motor 228 fixedly connected to the upper side of the flocculation tank 21. The output end of the first motor 228 is fixedly connected to a first bevel gear 229. The first bevel gear is meshed with a second bevel gear 2210. A hollow chemical agent distribution rod 222 is fixedly connected to the center of the second bevel gear 2210. The upper end of the chemical agent distribution rod 222 is rotatably connected to a hollow chemical agent collecting box 2211. The chemical agent collecting box 2211 is fixedly connected to the first motor 228 through a fixing frame. Two medicine conveying pipes 2212 are communicated with the top of the chemical agent collecting box 2211 through pipes. The two medicine conveying pipes 2212 are respectively communicated with medicine tanks 221 through pipes (one group of medicine tanks 221 is filled with flocculant, the other group of medicine tanks 221 is filled with neutralizing agent, and a blowing pump for blowing out the chemical agent is also disposed inside the medicine tanks 221). The chemical agent distribution rod 222 rotates through to the inside of the flocculation tank 21. A plurality of L-shaped arms 225 are fixedly connected to the part of the chemical agent distribution rod 222 located inside the flocculation tank 21. An L-shaped branch pipe 223 is integrally and fixedly connected to the middle of the L-shaped arm 225. The L-shaped branch pipe 223 is communicated with the inside of the chemical agent distribution rod 222. A plurality of one-way valves 224 (the water outlet end of the one-way valve 224 points to the outside) are installed on the L-shaped branch pipe 223.

[0045] During specific operation, the first motor 228 controls the first bevel gear 229 to drive the second bevel gear 2210 to rotate. The second bevel gear 2210 drives the chemical agent distribution rod 222 to rotate. The chemical agent and wastewater are fully mixed through the bifurcated L-shaped arm 225. The chemical agent is evenly dispersed into each part of the flocculation tank 21 through the bifurcated L-shaped branch pipe 223, accelerating the flocculation efficiency. The chemical agent is conveyed from the chemical agent tank 221 to the chemical agent collecting box 2211 through the chemical agent conveying pipe 2212, and two kinds of chemical agents are concentrated into the chemical agent distribution rod 222 through the chemical agent collecting box 2211.

[0046] Refer to Figure 2 The solid-liquid separation assembly 25 includes a plurality of overflow collecting pipes 251 arranged at equal intervals along the left-right direction on the upper side inside the sedimentation tank 23. The left end of the overflow collecting pipe 251 is fixedly connected to the left side wall of the sedimentation tank 23. The rear end of the overflow collecting pipe 251 penetrates through the right side wall of the sedimentation tank 23 and extends to the outside of the sedimentation tank 23. A plurality of water inlets 2511 are equidistantly arranged on the upper side of the overflow collecting pipe 251. A plurality of equally spaced inclined sedimentation plates 252 are arranged below the plurality of overflow collecting pipes 251. The sedimentation plates 252 are wavy plates. The lower ends of the plurality of sedimentation plates 252 are fixedly connected together with a plurality of fixing rods 254 distributed in the front-rear direction. The front and rear ends of the plurality of fixing rods 254 are fixedly connected together with connecting plates 253, and the connecting plates 253 are fixedly connected to the inner wall of the sedimentation tank 23.

[0047] During specific operation, the water in the flocculation tank 21 continuously enters the sedimentation tank 23, and the water surface in the sedimentation tank 23 will gradually rise. The flocs gradually sink to the bottom of the tank because they are heavier than the surrounding liquid, forming a layer of sediment. The sedimentation plates 252 will collect some fine flocs that slowly rise with the water flow. The wavy sedimentation plates 252 can increase the effective utilization area of the sedimentation plates 252, effectively ensuring the collection effect of the flocs. The gravity of the collected flocs increases, and they will descend to the bottom of the tank along the inclined sedimentation plates 252, so that the flocs and water are stratified. The upper side of the sedimentation tank 23 is the water after removing a large amount of flocs. When the water surface rises to the water inlets 2511, it will enter the overflow collecting pipes 251.

[0048] Refer to Figure 2 and Figure 3, the floc discharge assembly 24 includes a waste conveying auger 242 rotatably connected to the center of the bottom of the sedimentation tank 23. The waste conveying auger 242 is driven by a second motor 241, and the second motor is fixedly connected to the outside of the sedimentation tank 23. A mounting opening 231 is provided at the center of the left side wall of the sedimentation tank 23. An external housing 246 is fixedly connected to the outside of the mounting opening 231. A waste dewatering auger 244 is rotatably connected inside the external housing 246. The pitch of the waste dewatering auger 244 gradually decreases from bottom to top. An arc-shaped filter screen 245 is fixedly connected inside the mounting opening 231. A filter cloth is attached to the arc-shaped filter screen 245. The inner wall of the arc-shaped filter screen 245 is in sliding contact with the waste dewatering auger 244. The waste dewatering auger 244 is driven by a third motor 243, and the third motor 243 is fixedly connected to the outside of the external housing 246. A floc discharge opening 2461 is provided at the upper left end of the external housing 246.

[0049] During specific operation, the second motor 241 drives the waste conveying auger 242 to rotate to convey the flocs at the bottom of the sedimentation tank 23 to the bottom of the external housing 246. The third motor 243 drives the waste dewatering auger 244 to rotate to convey the flocs at the bottom of the external housing 246 to be discharged from the floc discharge opening 2461. The continuously decreasing pitch of the waste dewatering auger 244 can gradually compress the flocs to squeeze out the water in the flocs, which is convenient for later treatment. The water squeezed out will enter the sedimentation tank 23 through the arc-shaped filter screen 245 and can be reused.

[0050] Refer to Figure 1 、 Figure 5 and Figure 6 , the filtering assembly 32 includes a first water delivery pipe 321 connected to the rear end of each overflow collecting pipe 251 through a pipeline. A plurality of second water delivery pipes 323 are fixedly penetrated through the front side wall of the aeration tank 31 at equal intervals in the left-right direction. The first water delivery pipe 321 and the second water delivery pipes 323 are correspondingly connected through a filter pipe 322. The filter pipes 322 are vertically distributed and are filled with a sand filter layer, an activated carbon filter layer, and a microfiltration medium layer from top to bottom in sequence. A short pipe one is also connected to the first water delivery pipe 321 through a pipeline. All the short pipes one are commonly connected to a water outlet pipe 324, and the water outlet pipe 324 is connected to an external collection system (the external collection system is not shown in the figure, and the external collection system is used to collect the backflush water in the water outlet pipe 324). A short pipe two is also connected to the second water delivery pipes 323 through a pipeline. All the short pipes two are commonly connected to a water inlet pipe 325, and the water inlet pipe 325 is connected to an external water delivery system (the external water delivery system is not shown in the figure, and it is used to input backflush water into the water inlet pipe 325). Electric control valves are provided on the first water delivery pipe 321, the second water delivery pipes 323, the short pipe one, and the short pipe two.

[0051] During specific operation, the wastewater collected in the overflow collection pipe 251 enters the first water delivery pipe 321. The residual suspended solids and colloids in the wastewater are filtered by the filter pipe 322. The filter holes of the filter layer gradually shrink, and the impurities are filtered and stratified. The filtered water is discharged into the aeration tank 31 through the second water delivery pipe 323. The conveyance of the first water delivery pipe 321 and the second water delivery pipe 323 is closed through the electric control valve, and the conveyance of the first short pipe and the second short pipe is opened through the electric control valve. Backflush water is input into the filter pipe 322 by the external water delivery system. The reverse flow of water can drive the impurities in the filter layer to flow out, and the impurities are collected and processed by the external collection system, so as to achieve the effect of backflush cleaning of the filter pipe 322.

[0052] Refer to Figure 7 and Figure 8 The aeration component 34 includes an air inlet pipe 341 fixedly connected to the bottom of the left and right side walls of the aeration tank 31. The upper side of the aeration tank 31 is open and activated sludge is placed inside. One end of the air inlet pipe 341 extends outside the aeration tank 31 and communicates with an external aeration device (the aeration device is not shown in the figure). A number of branch air pipes 342 are equidistantly installed on the part of the air inlet pipe 341 located inside the aeration tank 31. A number of air jet heads 343 are installed on the branch air pipes 342. The air jet heads 343 are in the shape of a mushroom. A number of inclined air outlet holes 3431 are formed in the lower side wall of the mushroom head cover of the air jet head 343.

[0053] During specific operation, oxygen is filled into the air inlet pipe 341 through the aeration device. The oxygen is dispersed by the air inlet pipe 341 and the branch air pipes 342, and then discharged through the dispersed air jet heads 343 to evenly aerate the wastewater in the aeration tank 31. Setting the air outlet holes 3431 under the air jet heads 343 can prevent the activated sludge from solidifying and blocking the air outlet holes 3431 when the operation stops. A submersible pump is also installed in the aeration tank 31. The output end of the submersible pump communicates with the filter water tank 33. The aerated wastewater is conveyed to the filter water tank 33 through the submersible pump. Activated sludge is introduced into the aeration tank 31 and oxygen is continuously supplied, so that the organic pollutants in the water are degraded under the metabolic action of microorganisms.

[0054] Refer to Figure 7, the ultrafiltration component 35 includes a number of external connection pipes 354 fixedly connected between the front and rear walls of the filter water tank 33. Ultrafiltration pipes 352 are connected to the inside of the external connection pipes 354 located inside the filter water tank 33. The rear ends of a number of external connection pipes 354 extend to the outside of the filter water tank 33 and are jointly connected to a collecting pipe 353. The center of the lower side of the collecting pipe 353 is connected to the input end of the second water pump 351 through a pipe. A cleaning component 355 for quickly cleaning the surface of the ultrafiltration pipe 352 is arranged around the ultrafiltration pipe 352. A sludge return component 356 for pumping the settled activated sludge into the aeration tank 31 is arranged at the bottom of the filter water tank 33; the cleaning component 355 includes a number of scraping rings 3555 sleeved around the ultrafiltration pipe 352. A number of scraping rings 3555 on the same ultrafiltration pipe 352 are jointly fixedly connected to a connecting rod 3554. The rear ends of a number of connecting rods 3554 slide through the rear side wall of the filter water tank 33 and are jointly fixedly connected to a traction plate 3553. Connecting frames 3551 are fixedly connected to the left and right ends of the traction plate 3553. The connecting frames 3551 are fixedly connected to the output end of an electric push rod 3552. The electric push rod 3552 is fixedly connected to the outer side wall of the filter water tank 33; the sludge return component 356 includes a third water pump 3562 installed at the bottom of the filter water tank 33. The input end of the third water pump 3562 is connected to a sludge return pipe 3561. The output pipe of the third water pump 3562 communicates with the aeration tank 31. Through holes are provided on the sludge return pipe 3561.

[0055] During specific operation, the second water pump 351 operates to pump the water in the filter water tank 33. The water is re-filtered by the ultrafiltration pipes 352 to filter out sludge, fine particles, bacteria, viruses, and refractory substances. The electric push rod 3552 operates to control the forward and backward movement of the traction plate 3553. The traction plate 3553 drives the connecting rod 3554 to control the scraping ring 3555 to scrape on the surface of the ultrafiltration pipe 352, thereby preventing impurities from accumulating on the surface of the ultrafiltration pipe 352 and affecting the blockage of the ultrafiltration pipe 352. The third water pump 3562 operates to pump the activated sludge settled at the bottom of the filter water tank 33 into the aeration tank 31 for secondary recycling of the activated sludge.

[0056] In addition, the present invention also provides a method for purifying and recycling coal mine underground wastewater, which is used in cooperation with the above-mentioned coal mine underground wastewater purification and recycling device. The specific steps are as follows:

[0057] S1: The wastewater is input into the flocculation tank 21 through the main water pipe 4. The first motor 228 controls the first bevel gear 229 to drive the second bevel gear 2210 to rotate. The second bevel gear 2210 drives the chemical agent distribution rod 222 to rotate. The chemical agent is conveyed from the chemical agent tank 221 to the chemical agent collecting box 2211 through the chemical agent delivery pipe 2212. Two chemical agents are concentrated into the chemical agent distribution rod 222 through the chemical agent collecting box 2211. The chemical agent and the wastewater are fully mixed through the bifurcated L-shaped arm 225.

[0058] S2: The flocculated wastewater is discharged into the sedimentation tank 23 by the first water pump 226. The water in the flocculation tank 21 continuously enters the sedimentation tank 23, and the water level in the sedimentation tank 23 will gradually rise. The flocculants will gradually sink to the bottom of the tank because they are heavier than the surrounding liquid, forming a layer of sediment. The sedimentation plate 252 will collect some fine flocculants that slowly rise with the water flow. The gravity of the collected flocculants increases, and they will descend to the bottom of the tank along the inclined sedimentation plate 252. The upper side of the sedimentation tank 23 is the water after removing a large amount of flocculants. When the water level rises to the water inlet 2511, it will enter the overflow collection pipe 251.

[0059] S3: After sedimentation for a certain period, the waste material conveying auger 242 is driven to rotate by the second motor 241 to convey the flocculants at the bottom of the sedimentation tank 23 to the bottom of the outer shell 246. The waste material dewatering auger 244 is driven to rotate by the third motor 243 to convey the flocculants at the bottom of the outer shell 246 to the floc discharge port 2461 for discharge. The pitch of the waste material dewatering auger 244 continuously decreases, which can gradually compress the flocculants and squeeze out the water in the flocculants. The squeezed water enters the sedimentation tank 23 through the arc-shaped filter screen 245 for secondary utilization.

[0060] S4: The wastewater collected in the overflow collection pipe 251 enters the first water delivery pipe 321. The residual suspended solids and colloids in the wastewater are filtered by the filter pipe 322. The filter holes of the filter layer gradually shrink, and the impurities are filtered and stratified. The filtered water is discharged into the aeration tank 31 through the second water delivery pipe 323. Oxygen is filled into the intake pipe 341 through the aeration equipment. The oxygen is dispersed by the intake pipe 341 and the branch pipe 342, and then discharged through the dispersed jet heads 343 to uniformly aerate the wastewater in the aeration tank 31. After aeration, the aerated wastewater is transported to the filter water tank 33 by the submersible pump. The water in the filter water tank 33 is pumped by the second water pump 351. The water is filtered again by the ultrafiltration pipe 352 to filter out sludge, fine particles, bacteria, viruses and refractory substances. The electric push rod 3552 operates to control the traction plate 3553 to move back and forth, and the traction plate 3553 drives the connecting rod 3554 to control the scraping ring 3555 to scrape on the surface of the ultrafiltration pipe 352, so as to avoid impurities accumulating on the surface of the ultrafiltration pipe 352 and causing blockage and influence on the ultrafiltration pipe 352. The activated sludge settled at the bottom of the filter water tank 33 is pumped into the aeration tank 31 by the third water pump 3562 for secondary recycling of the activated sludge.

[0061] S5: When the filter pipe 322 needs to be cleaned, the delivery of the first short pipe and the second short pipe is opened through the electric control valve, and backflush water is input into the filter pipe 322 by the external water delivery system. The reverse flow of water can drive the impurities in the filter layer to flow out, and the impurities are collected and processed by the external collection system.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for purifying and recycling underground coal mine wastewater, comprising a base (1), characterized in that: On the upper side of the base (1), a flocculation tank (21), a sedimentation tank (23), an aeration tank (31) and a water filtration tank (33) are fixedly connected in sequence from front to back by a number of legs. A main water pipe (4) is fixedly connected to the front side of the flocculation tank (21). A solid-liquid separation component (25) for primary separation of impurities in coal mine wastewater is jointly arranged inside and outside the flocculation tank (21) and the sedimentation tank (23). A secondary filtration mechanism (3) for secondary filtration of the separated wastewater is jointly arranged inside and outside the aeration tank (31) and the water filtration tank (33). The primary separation mechanism (2) includes a chemical agent adding component (22) arranged inside and at the top of the flocculation tank (21) for adding flocculants and neutralizing agents. A water pump one (226) is fixedly connected to the bottom of the flocculation tank (21). The input end and the output end of the water pump one (226) are respectively communicated with the flocculation tank (21) and the sedimentation tank (23) through a connecting pipe (227). A solid-liquid separation component (25) for sedimentation of flocs is arranged inside the sedimentation tank (23). A floc discharging component (24) for discharging sedimentation is jointly arranged at the bottom and the left side of the sedimentation tank (23). The secondary filtration mechanism (3) includes a filtration component (32) arranged between the sedimentation tank (23) and the aeration tank (31). An aeration component (34) for aerating the wastewater is arranged inside the aeration tank (31). An ultrafiltration component (35) for discharging available water is arranged inside the water filtration tank (33). By using the primary separation mechanism (2) and the secondary filtration mechanism (3) in cooperation, impurities in coal mine wastewater can be effectively removed and available water sources can be discharged.

2. The coal mine underground wastewater purification and recycling device according to claim 1, characterized in that: The chemical agent adding component (22) includes a motor one (228) fixedly connected to the upper side of the flocculation tank (21). The output end of the motor one (228) is fixedly connected with a bevel gear one (229). The bevel gear is meshed with a bevel gear two (2210). A hollow chemical agent distribution rod (222) is fixedly connected to the center of the bevel gear two (2210). The upper end of the chemical agent distribution rod (222) is rotatably connected with a hollow chemical agent collecting box (2211). The chemical agent collecting box (2211) is fixedly connected to the motor one (228) through a fixing frame. Two medicine conveying pipes (2212) are connected to the top of the chemical agent collecting box (2211) through pipelines. The two medicine conveying pipes (2212) are respectively connected to medicine tanks (221) through pipelines. The chemical agent distribution rod (222) rotates through to the inside of the flocculation tank (21). A number of L-shaped support arms (225) are fixedly connected to the part of the chemical agent distribution rod (222) located inside the flocculation tank (21). An L-shaped branch pipe (223) is fixedly integrally connected to the middle of the L-shaped support arm (225). The L-shaped branch pipe (223) and the chemical agent distribution rod (222) are internally communicated. A number of one-way valves (224) are installed on the L-shaped branch pipe (223).

3. The coal mine underground wastewater purification and recycling device according to claim 1, characterized in that: The solid-liquid separation assembly (25) includes a number of overflow collection pipes (251) arranged equidistantly in the upper side of the precipitation tank (23) in the left-right direction. The left end of the overflow collection pipe (251) is fixedly connected to the left side wall of the precipitation tank (23). The rear end of the overflow collection pipe (251) penetrates through the right side wall of the precipitation tank (23) and extends to the outside of the precipitation tank (23). A number of water inlets (2511) are equidistantly arranged on the upper side of the overflow collection pipe (251). A number of equally spaced and inclined precipitation plates (252) are arranged below the number of overflow collection pipes (251). The precipitation plate (252) is a corrugated plate. The lower ends of the number of precipitation plates (252) are fixedly connected together with a number of fixing rods (254) distributed in the front-rear direction. Both the front and rear ends of the number of fixing rods (254) are fixedly connected together with connecting plates (253). The connecting plate (253) is fixedly connected to the inner wall of the precipitation tank (23).

4. A device for purifying and recycling underground coal mine wastewater according to claim 1, characterized in that: The floc discharge assembly (24) includes a spiral shaft one (242) rotatably connected to the center of the bottom of the precipitation tank (23). The spiral shaft one (242) is driven by a motor two (241). The motor two is fixedly connected to the outside of the precipitation tank (23). An installation opening (231) is provided at the center of the left side wall of the precipitation tank (23). An external housing (246) is fixedly connected to the outside of the installation opening (231). A waste dehydration auger (244) is rotatably connected inside the external housing (246). The pitch of the waste dehydration auger (244) gradually decreases from bottom to top. An arc-shaped filter screen (245) is fixedly connected inside the installation opening (231). A filter cloth is attached to the arc-shaped filter screen (245). The inner wall of the arc-shaped filter screen (245) is in sliding contact with the waste dehydration auger (244). The waste dehydration auger (244) is driven by a motor three (243). The motor three (243) is fixedly connected to the outside of the external housing (246). A floc discharge port (2461) is provided at the upper left end of the external housing (246).

5. A device for purifying and recycling underground coal mine wastewater according to claim 3, characterized in that: The filtration assembly (32) includes a water delivery pipe one (321) connected to the rear end of each overflow collection pipe (251) through a pipeline. A number of water delivery pipes two (323) are fixedly penetrated through the front side wall of the aeration tank (31) equidistantly in the left-right direction. The water delivery pipe one (321) and the water delivery pipes two (323) are connected in one-to-one correspondence through a filter pipe (322). The filter pipe (322) is vertically distributed and is filled with a sand filter layer, an activated carbon filter layer, and a microfiltration medium layer in sequence from top to bottom. A short pipe one is also connected to the water delivery pipe one (321) through a pipeline. The short pipes one are commonly connected to a water outlet pipe (324). The water outlet pipe (324) is connected to an external collection system. A short pipe two is also connected to the water delivery pipe two (323) through a pipeline. The short pipes two are commonly connected to a water inlet pipe (325). The water inlet pipe (325) is connected to an external water delivery system. Electric control valves are provided on the water delivery pipe one (321), the water delivery pipes two (323), the short pipe one, and the short pipe two.

6. The coal mine underground wastewater purification and recycling device according to claim 1, characterized in that: The aeration component (34) includes an air inlet pipe (341) fixedly connected to the bottoms of the left and right side walls of the aeration tank (31). The upper side of the aeration tank (31) is open and activated sludge is placed inside. One end of the air inlet pipe (341) extends outside the aeration tank (31) and communicates with an external aeration device. A number of branch air pipes (342) are equidistantly installed on the part of the air inlet pipe (341) located inside the aeration tank (31). A number of jet nozzles (343) are installed on the branch air pipes (342). The jet nozzles (343) are in the shape of a mushroom. A number of inclined air outlet holes (3431) are provided on the lower side wall of the mushroom-shaped cover of the jet nozzle (343).

7. A device for purifying and recycling underground coal mine wastewater according to claim 1, characterized in that: The ultrafiltration component (35) includes a number of external connecting pipes (354) fixedly connected between the front and rear walls of the filter water tank (33). Ultrafiltration pipes (352) are connected to the inside of the filter water tank (33) through the external connecting pipes (354). The rear ends of the number of external connecting pipes (354) extend outside the filter water tank (33) and are jointly connected to a collecting pipe (353). The center of the lower side of the collecting pipe (353) is connected to the input end of a second water pump (351) through a pipeline. A cleaning component (355) for quickly cleaning the surface of the ultrafiltration pipes (352) is arranged on the periphery of the ultrafiltration pipes (352). A sludge return component (356) for pumping the settled activated sludge into the aeration tank (31) is arranged at the bottom of the filter water tank (33).

8. A device for purifying and recycling underground coal mine wastewater according to claim 7, characterized in that: The cleaning component (355) includes a number of scraping rings (3555) sleeved on the periphery of the ultrafiltration pipes (352). A number of scraping rings (3555) on the same ultrafiltration pipe (352) are jointly fixedly connected to a connecting rod (3554). The rear ends of the number of connecting rods (3554) slide through the rear side wall of the filter water tank (33) and are jointly fixedly connected to a traction plate (3553). Connecting frames (3551) are fixedly connected to the left and right ends of the traction plate (3553). The connecting frames (3551) are fixedly connected to the output ends of electric push rods (3552). The electric push rods (3552) are fixedly connected to the outer side wall of the filter water tank (33).

9. The coal mine underground wastewater purification and recycling device according to claim 7, wherein: The sludge return component (356) includes a third water pump (3562) installed at the bottom of the filter water tank (33). The input end of the third water pump (3562) is communicated with a sludge return pipe (3561). The output pipe of the third water pump (3562) communicates with the aeration tank (31). Through holes are provided on the sludge return pipe (3561).

10. A method for purifying and recycling waste water in coal mines underground, characterized in that, Using the coal mine underground wastewater purification and recycling device according to any one of claims 5 to purify the coal mine underground wastewater, the specific steps are as follows: Step 1: Input the wastewater into the flocculation tank (21) through the main water pipe (4), and add a flocculant and a neutralizing agent to the wastewater through the chemical agent adding component (22) and mix them; Step 2: Input the flocculated wastewater into the sedimentation tank (23) through the first water pump (226). The solid-liquid separation component (25) settles the flocculants to remove most of the suspended solids and part of the organic matter. Then, the water in the upper part of the sedimentation tank (23) is transported into the filtration component (32) through the overflow collecting pipe (251); Step 3: Residual suspended matter and colloidal substances are removed through the filter tube (322), and the filtered water is input into the aeration tank (31) through the water pipe 2 (323); Step 4: removing dissolved organic matter and part of ammonia nitrogen through an aeration assembly (34); Step 5: The ultrafiltration component (35) is used to intercept tiny particles, bacteria, viruses and refractory substances, and clean water is discharged for recycling.

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