CN112047577A - Treatment system and process for underground water expression earth surface III of high-turbidity coal mine - Google Patents
Treatment system and process for underground water expression earth surface III of high-turbidity coal mine Download PDFInfo
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C02F1/5281—Installations for water purification using chemical agents
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
Abstract
The invention discloses a treatment system and a treatment process for underground water of a high-turbidity coal mine to reach a ground surface III, and the treatment system comprises a coagulating sedimentation system, an intermediate water tank, a water purifier, a filter, an ultrafiltration device, a clean water tank, a sludge treatment system and a sludge tank, and also comprises a pretreatment workshop and an advanced treatment workshop, wherein the pretreatment workshop is provided with a primary sedimentation device and a pre-sedimentation device, the primary sedimentation device is connected with underground water, and the pre-sedimentation device is connected with the coagulating sedimentation system; the advanced treatment workshop is positioned between the pretreatment workshop and the clean water tank, and the advanced treatment workshop is provided with a biological filter system and an ultrafiltration system; the coal mine underground water effluent treated by the system can stably reach the water quality standard of the earth surface III.
Description
Technical Field
The invention belongs to the technical field of coal mine underground water treatment, and particularly relates to a treatment system and process for high-turbidity coal mine underground water expression surface III.
Background
China is a country where coal mining and coal utilization are the largest, and a large amount of coal mine underground water needs to be discharged to the ground for treatment in the coal mining process. When a coal mine is built in a mine, most of the coal mines are built into an underground water treatment station, and the general effluent indexes of the coal mine execute the emission standard of coal pollutants, the underground fire protection and sprinkling recycled water quality and other recycling standards. Along with the underground exploitation, the concentration of pollutants in the underground water is increased, mainly comprising petroleum, SS, COD and NH3H, and the like, in addition, along with the increasingly strict requirements of the national environmental protection policy, the requirement on the water quality of underground water discharge is increasingly strict, and the effluent needs to meet the requirements on the water quality of III-class water in the quality standard of surface water environment GB3838-2002, mainly including COD and NH3-H、TP。
Most underground water treatment systems of coal mines generally adopt a treatment process of 'coagulation + precipitation + filtration', and mine water needs to be improved in standard along with the change of underground water quality and the stricter requirement of effluent water quality.
SS in underground water of the coal mine has large change, and particularly, the SS concentration can reach about 10000mg/L and tends to show a gradually increasing trend when underground clearing is carried out. The first structure of most underground coal mine water treatment stations is a regulating reservoir, so that the problem of water imbalance between underground drainage and a ground water treatment station is solved. Investigation shows that the existing regulating tanks of all underground coal mine water treatment stations mainly have 2 problems: part of the adjusting tanks have no precipitation effect, so that the subsequent coagulation and precipitation pressure is higher, and the dosage is more; secondly, part of the adjusting tanks have a sedimentation function, but the sludge discharge effect is poor, and the sludge accumulation is serious.
The conventional treatment system can effectively reduce SS in underground water of the coal mine, and suspended COD can be reduced along with the SS, but the treatment system has no removing effect on soluble COD, ammonia nitrogen, soluble petroleum and the like, and the quality of effluent is easy to exceed the standard.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a treatment system and a treatment process for underground water of a high-turbidity coal mine to reach the ground surface III.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a treatment system for underground water of a high-turbidity coal mine to reach the earth surface III comprises a coagulating sedimentation system, an intermediate water tank, a water purifier, a filter, an ultrafiltration device, a clear water tank, a sludge treatment system and a sludge tank, and also comprises a pretreatment workshop and an advanced treatment workshop, wherein the pretreatment workshop is provided with a primary sedimentation device and a pre-sedimentation device, the primary sedimentation device is connected with underground water, and the pre-sedimentation device is connected with the coagulating sedimentation system; the advanced treatment workshop is positioned between the pretreatment workshop and the clean water tank, and the advanced treatment workshop is provided with a biological filter system and an ultrafiltration system.
Further, the primary sedimentation device comprises a primary sedimentation tank, the pre-sedimentation device comprises a pre-sedimentation regulating tank, a pre-sedimentation device and a pretreatment filter, the primary sedimentation tank is connected with underground water, the outlet water of the primary sedimentation tank is connected with the pre-sedimentation regulating tank, and a sludge outlet of the primary sedimentation tank is connected with a sludge well; the effluent of the pre-sedimentation regulating tank is respectively connected with a coagulating sedimentation system and a pre-sedimentation device, the effluent of the coagulating sedimentation system and the effluent of the pre-sedimentation device are both introduced into an intermediate water tank, the effluent of the intermediate water tank is introduced into a pretreatment filter, and the effluent of the pretreatment filter is introduced into a biological filter system;
the biological filter system comprises a biological filter, wherein the inlet of the biological filter is connected with a pretreatment filter, the water outlet of the biological filter is connected with an intermediate water tank, and the water outlet of the intermediate water tank is connected with a self-cleaning filter; the outlet water of the self-cleaning filter is communicated with the ultrafiltration system, the water outlet of the ultrafiltration system is connected with an ultrafiltration water production tank, the water inlet of the ultrafiltration water production tank is also connected with the outlet water of an ultrafiltration device, and the outlet water of the ultrafiltration water production tank is communicated with the clean water tank;
and sludge outlets of the sludge well, the pre-settling regulating tank, the pre-settling device and the coagulating sedimentation system are all communicated with a sludge tank.
Furthermore, the middle water tank is provided with an aeration and oxygenation mechanism, the water outlet of the middle water tank is also connected with a water purifier, the outlet of the water purifier is communicated with an ultrafiltration device after passing through a filter, and the water outlet of the ultrafiltration device is communicated with an ultrafiltration water production tank.
Furthermore, the sludge tank is connected with a sludge treatment system and a backwashing water collecting tank, and the backwashing water collecting tank is connected with the pre-settling regulating tank.
Further, the peripheral tank wall of the biological filter is a napping treatment structure; an interception screen is arranged in the clear water area of the biological filter and away from the top of the filter material; the biological filter is connected with a biological filter backwashing pump and a backwashing fan, and the biological filter backwashing pump is connected with the middle water tank.
Furthermore, the biological filter is a combined filter material aeration biological filter, and adopts ceramsite and active carbon combined filter materials.
Furthermore, the ultrafiltration system is provided with a chemical cleaning and on-line cleaning system, and an ultrafiltration backwashing pump is also arranged between the ultrafiltration water production tank and the ultrafiltration system.
Further, the primary sedimentation tank is a radial flow sedimentation tank.
A treatment process for underground water expression earth surface III of a high-turbidity coal mine comprises the following steps:
lifting mine water from an underground sump and then entering a primary sedimentation tank to remove large particles;
the effluent of the primary sedimentation tank automatically flows into a pre-sedimentation regulating tank, and the pre-sedimentation regulating tank respectively lifts the mine water to a coagulating sedimentation system and a pre-settler for coagulating sedimentation treatment;
the effluent of the coagulating sedimentation system enters an intermediate water tank for aeration and oxygenation, the intermediate water tank conveys the mine water to a water purifier and a filter for treatment, the effluent of the filter enters an ultrafiltration device for treatment, the effluent of the ultrafiltration device enters an ultrafiltration water production tank, and then enters a clean water tank for recycling or standard discharge after being disinfected by sodium hypochlorite;
the middle water tank conveys the mine water into a pretreatment filter and a biological filter in sequence, and the outlet water of the biological filter enters a middle water tank;
the water in the intermediate water tank sequentially passes through the self-cleaning filter and the ultrafiltration system to further ensure the quality of the outlet water, and the outlet water of the ultrafiltration system enters the ultrafiltration water production tank and then enters the clean water tank to be recycled or discharged after being disinfected by sodium hypochlorite.
Further, the surface load of the primary sedimentation tank is less than or equal to 3.6m3/m2H, the settling time is more than or equal to 1.5h, and the load of an effluent weir is less than or equal to 1.7L/s.m.
Further, the biofilter comprises one or more of the following filtration rates: 6-7 m/h, the empty bed residence time is more than or equal to 30min, and the thickness of the zeolite filter material is as follows: 1.5-2 m, thickness of the active carbon filter material: 1 to 1.5m, an iodine adsorption value of the activated carbon of greater than or equal to 900mg/g, a specific surface area of 900-2Per g, strength greater than 90%, packing density 0.35-0.55g/cm3The particle size of the ceramsite filter material is as follows: 2-6 mm.
Further, the ultrafiltration system comprises one or more sets of ultrafiltration membranes, and the flux of the ultrafiltration membranes is 33-40L/m2.h。
Compared with the prior art, the invention has the following beneficial effects:
the system and the process method solve the problem of anti-suspended matter impact of the coal mine underground water treatment station and effectively meet the requirement that the coal mine underground water treatment station stably reaches the earth surface III.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Wherein, 1 coagulating sedimentation system, 2 middle water tanks, 3 water purifiers, 4 filters, 5 ultrafiltration devices, 6 clean water tanks, 7 pretreatment workshops, 8 advanced treatment workshops, 9 sludge treatment systems, 10 sludge tanks, 11 primary sedimentation tanks, 12 pre-sedimentation regulating tanks, 13 pre-sedimentation devices, 14 pretreatment filters, 15 sludge wells, 16 underground water, 17 biofilters, 18 middle water tanks, 19 self-cleaning filters, 20 ultrafiltration systems, 21 ultrafiltration production water tanks, 22 backwash water collecting tanks, 23 biofilter backwash pumps, 24 ultrafiltration backwash pumps, 25 sewage lift pumps, 26 water tanks and 27 reuse pump rooms.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
As shown in fig. 1, the treatment system for the underground water surface iii of the high-turbidity coal mine comprises a coagulating sedimentation system 1, an intermediate water tank 2, an integrated water purifier 3, a quartz sand filter 4, an ultrafiltration device 5, a clean water tank 6, a sludge treatment system 9 and a sludge tank 10, and further comprises a pretreatment workshop 7 and an advanced treatment workshop 8, wherein the pretreatment workshop 7 is provided with a primary sedimentation device and a pre-sedimentation device, the primary sedimentation device is connected with underground water, and the pre-sedimentation device is connected with the coagulating sedimentation system; the advanced treatment workshop 8 is positioned between the pretreatment workshop 7 and the clean water tank 6, and the advanced treatment workshop 8 is provided with a biological filter system and an ultrafiltration system 20.
The primary sedimentation device comprises a primary sedimentation tank 11, the pre-sedimentation device comprises a pre-sedimentation regulating tank 12, a pre-sedimentation device 13 and a pretreatment filter 14, the primary sedimentation tank 11 is connected with underground water 16, the effluent of the primary sedimentation tank 11 is connected with the pre-sedimentation regulating tank 12, and a sludge outlet of the primary sedimentation tank 11 is connected with a sludge well 15; the effluent of the pre-sedimentation regulating tank 12 is respectively connected with a coagulating sedimentation system 1 and a pre-sedimentation device 13, the effluent of the coagulating sedimentation system 1 and the pre-sedimentation device 13 is introduced into an intermediate water tank 2, the effluent of the intermediate water tank 2 is introduced into a pretreatment filter 14, and the effluent of the pretreatment filter 14 is introduced into a biological filter system;
the biological filter system comprises a biological filter 17, wherein the inlet of the biological filter 17 is connected with a pretreatment filter 14, the outlet of the biological filter 17 is connected with an intermediate water tank 18, and the outlet of the intermediate water tank 18 is connected with a self-cleaning filter 19; the effluent of the self-cleaning filter 19 is led to the ultrafiltration system 20, the water outlet of the ultrafiltration system 20 is connected with an ultrafiltration water production tank 21, the water inlet of the ultrafiltration water production tank 21 is also connected with the effluent of the ultrafiltration device 5, and the effluent of the ultrafiltration water production tank 21 is led to the clean water tank 6; the effluent of the clean water tank can be pumped by a recycling pump room 27 for underground recycling.
The sludge well 15, the pre-settling regulating tank 12, the pre-settling device 13 and the sludge outlet of the coagulating sedimentation system 1 are all communicated with the sludge tank 10.
The rinsing water of the ultrafiltration system 20 is led to a backwashing water collecting tank 22, the pre-settling regulating tank 12, the pretreatment filter 14 and the biological filter 17 are all provided with backwashing pumps, and the backwashing water of the pre-settling regulating tank, the pretreatment filter and the biological filter is led to the backwashing water collecting tank.
The middle water tank 3 is provided with an aeration and oxygenation mechanism, the water outlet of the middle water tank is also connected with an integrated water purifier, the outlet of the integrated water purifier is communicated with an ultrafiltration device after passing through a quartz sand filter, and the water outlet of the ultrafiltration device is communicated with an ultrafiltration water production tank.
The sludge tank 10 is connected with a sludge treatment system 9 and a backwashing water collecting tank 22, and the backwashing water collecting tank 22 is connected with the pre-settling adjusting tank 12.
A water tank 26 may be further provided between the integrated water purifier 3 and the quartz sand filter 4.
(1) Preliminary sedimentation tank system
The design flow is based on the actual operation condition of the underground drainage pump, and the surface load of the primary sedimentation tank is less than or equal to 3.6m3/m2H, the settling time is more than or equal to 1.5h, and the load of an effluent weir is less than or equal to 1.7L/s.m.
The primary sedimentation tank in the system can improve the impact load resistance of the whole coal mine underground water treatment station and correspondingly reduce the use of the subsequent coagulating sedimentation agent amount. The primary sedimentation tank is arranged between the underground drainage pipe and the regulating tank, so that the advantage of utilizing the residual pressure of underground drainage is realized, the lifting link is reduced, the burden of the subsequent regulating tank is reduced, and the investment of modification is reduced.
The primary sedimentation tank adopts a radial flow sedimentation tank form, and has the main advantages that: the hydraulic condition is good; the sludge can be concentrated, and the sludge outlet concentration is high.
The primary sedimentation tank is internally provided with a water inlet pipe, a water outlet weir, a mud pipe, a mud scraper and the like. The process flow comprises the following steps: the underground wastewater is directly discharged to a water inlet pipe of the primary sedimentation tank through a drainage pump, the water inlet pipe leads the wastewater to a central water distribution barrel, water is uniformly distributed around the central water distribution barrel through a circle of water distribution barrels, the wastewater gradually flows from the center to the periphery and then is collected through a peripheral water outlet weir, and the collected wastewater flows to the next treatment unit.
The supporting oil skimming device that has of sedimentation tank still is equipped with peripheral driven type full-bridge or half-bridge mud scraper in the preliminary sedimentation tank, and the supporting skimming device that has of mud scraper has carried out the skimmer with the oil slick to the supporting floating oil well of preliminary sedimentation tank, and the manual clearance of the periodic oil of upper portion oil slick is cleared up to the useless room of danger, and lower part water gravity is arranged to this system and is handled.
The bottom of the primary sedimentation tank is reserved with a slope of 0.06%, the sludge scraper collects and concentrates sludge in the sludge scraping process, and finally the sludge is collected into a sludge hopper and finally discharged into a sludge well.
(2) Combined filter material biological aerated filter system
The biological filter comprises one or more biological filters which are aeration biological filters. The peripheral tank wall of the biological filter 17 is of a napping treatment structure; an interception screen for preventing the filter material from escaping is arranged in the clear water area of the biological filter 17 and away from the top of the filter material; the biological filter is connected with a biological filter backwashing pump 23 and a backwashing fan, and the biological filter backwashing pump 23 is connected with the middle water tank 18.
The conventional treatment system can effectively reduce SS in underground water of the coal mine, and suspended COD can be reduced along with the SS, but the treatment system has no removing effect on soluble COD, ammonia nitrogen, soluble petroleum and the like, and the quality of effluent is easy to exceed the standard. Therefore, the aerated biomass filter can reduce trace soluble COD, ammonia nitrogen and petroleum in water, adopts ceramsite and activated carbon combined filter materials, combines two treatment processes of ion adsorption exchange and biodegradation in the same reactor, and utilizes a physicochemical and biochemical method to complete removal of the soluble COD, ammonia nitrogen, soluble petroleum and other substances in mine water, and has the characteristics of low operation cost and stable operation effect. Compared with the process of 'breakpoint chlorination' adopted at the tail end, the method has the main advantages of low operation cost and small influence of effluent on the local water environment.
The filter structure can be made of steel equipment or in a reinforced concrete mode, and the peripheral wall of the filter is subjected to galling treatment to prevent the phenomenon of flow cutoff in the filtering process.
The area of a single filter tank is generally 15-30 m2The length-width ratio is 1:1, and the height of the device is 5.5-6.0 m.
Designing a filtering speed: 6-7 m/h; the residence time of the empty bed is designed to be more than or equal to 30 min.
Thickness of the active carbon filter material: 1-1.5 m, thickness of zeolite filter material: 1.5-2 m.
Activated carbon: columnar activated carbon with phi of 4-6mm, length of 4-10mm, iodine adsorption value greater than or equal to 900mg/g, specific surface area of 900-2Per g, strength greater than 90%, packing density 0.35-0.55g/cm3。
Filtering the ceramsite: 2-6 mm.
The distance between the clean water area and the top of the filter material (the distance is 0.55 times of the total thickness of the filter material), an interception screen for preventing the filter material from escaping is arranged, and the aperture of the screen is less than 0.8 times of the minimum particle size.
The backwashing adopts steam-water backwashing, long-handle filter heads are adopted for water distribution and gas distribution, a backwashing fan is configured, the fan is controlled in a variable frequency mode, a vortex shedding flowmeter is matched, the air quantity is adjusted through a valve, a backwashing water pump is variable frequency water, an electromagnetic flowmeter is matched, and the backwashing size is adjusted through the valve. Air washing strength of 15-20L/m2H, washing strength of 5-8L/m2·h。
The supporting beam of the water and gas distribution bottom plate is provided with a 0.05 multiplied by 0.02 balance seam to prevent local generation of gas pockets.
The aeration equipment adopts a Roots blower, the frequency conversion and speed regulation are realized, and the aeration adopts a single-hole membrane aeration head. Aeration strength: the steam-water ratio is controlled to be 1.5: 1-5.0: 1.
(3) Ultrafiltration system
The ultrafiltration system 20 is provided with a chemical cleaning and on-line cleaning system, and an ultrafiltration backwashing pump 24 is also arranged between the ultrafiltration water production tank 21 and the ultrafiltration system 20.
The ultrafiltration system comprises one or more sets of ultrafiltration membranes, and the flux of the ultrafiltration membranes is 33-40L/m2.h。
Because the filtering precision of the combined filter material biological aerated filter is limited, and micron-sized substances (including colloidal oil and fine suspended matters) are difficult to remove, the quality of the effluent water is influenced, and in addition, a dropped biological membrane which is difficult to avoid partial aging in the operation process of the combined filter material biological aerated filter can be brought out along with the effluent water and can also influence COD (chemical oxygen demand) and NH (NH) of the effluent water3And the H index, so that an ultrafiltration system is added, and the reliability of the effluent of the whole coal mine water treatment is higher.
Join in marriage and change brush self-cleaning filter: the filtration precision is 100-200 microns, and the treated water yield is 1.5 times of the ultrafiltration water yield.
The ultrafiltration device is preferably 2 sets, and the designed flux of the ultrafiltration membrane is 33-40L/m2H (domestic film).
The ultrafiltration water inlet and outlet are provided with meters such as flow, pressure sensors, turbidity meters and the like.
And (4) overflowing parts of the ultrafiltration water inlet lifting pump and the backwashing pump are S304 and are controlled by frequency conversion. The ultrafiltration system is provided with a chemical cleaning and on-line cleaning system and is controlled in a fully automatic unattended way.
And (3) setting a backwashing system of the ultrafiltration device, wherein the backwashing period is generally that the system performs physical cleaning once every 30min, the cleaning process is forward flushing, upward backwashing, downward backwashing and forward flushing, the total process of each step needs about 90s, wherein the forward flushing is 15s, and the upward and downward backwashing is 30 s. The backwashing water is the self-produced water of the equipment and is drawn from the water production tank of the ultrafiltration combined device. The backwashing pump of the ultrafiltration combined device is powered by a frequency converter, and the backwashing flow is constant through PID adjustment so as to prevent damage caused by over-flow backwashing.
When the ultrafiltration device needs to be chemically cleaned, only an instruction needs to be sent manually on an operation panel of an automatic control system or a display of a PC (personal computer), the chemical cleaning system automatically prepares a corresponding cleaning agent, after the cleaning agent is prepared, the micro-ultrafiltration combination device automatically switches into a chemical cleaning state, meanwhile, a chemical cleaning pump is started, chemical cleaning liquid is sent into ultrafiltration equipment and circulates in the micro-ultrafiltration combination device and the chemical cleaning tank until the chemical cleaning lasts for a while, and chemical cleaning waste liquid is sent into a neutralization tank. The micro-ultrafiltration combined device is flushed and then put into normal operation. The chemical cleaning cycle is generally one time of cleaning with one (or more) agents every 40-60 days, and the cleaning time is generally 2-5 h.
Examples
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below, with respect to the scale of project processing: 4000m3The inlet water quality is shown in the following table 1, and the outlet water quality is shown in the following table 2:
TABLE 1
TABLE 2
Mine water enters the primary sedimentation tank after being lifted by the underground water sump to finish the removal of large particles such as coal dust and the like. The effluent of the primary sedimentation tank automatically flows into a pre-sedimentation regulating tank, and the pre-sedimentation regulating tank is provided with two sewage lifting pumps 25 which respectively lift the mine water to the original coagulating sedimentation equipment and a newly-added chemical pre-sedimentation device for coagulating sedimentation treatment. The effluent of the coagulation and sedimentation system enters an intermediate water tank (a water production tank of the original coagulation and sedimentation system), and aeration and oxygenation are carried out in the intermediate water tank. The middle water tank is provided with a deep treatment lifting pump, the mine water is lifted and then treated by using the original FA integrated water purifier and a quartz sand filter, the effluent of the quartz sand filter enters the original ultrafiltration system for treatment, the effluent of the original ultrafiltration system enters an ultrafiltration water production tank and then enters a clean water tank for recycling or standard discharge after being disinfected by sodium hypochlorite; and a filtering lifting pump is additionally arranged in the middle water tank to lift the mine water, and then the mine water sequentially enters the manganese sand filter and the biological aerated filter, and the effluent of the biological aerated filter enters the middle water tank. The water in the intermediate water tank is lifted by the lift pump and then sequentially passes through the self-cleaning filter and the ultrafiltration system to further ensure the quality of the outlet water, and the ultrafiltration outlet water enters the ultrafiltration water production tank and then enters the clean water tank to be recycled or discharged after being disinfected by sodium hypochlorite.
The three parts of the primary sedimentation tank, the aeration biological filter, the ultrafiltration system and the like of the embodiment are mainly described.
First precipitation tank unit
The primary sedimentation tank 1 seat, a reinforced concrete structure, a square shape and a side length of 10.5m are arranged. The amount of treated water was designed to be 280.00m3// h, surface load, according to the worst case drainage by the down hole drain pump: 2.54m3//m2/. times.h. The retention time is 1.5h, the effective water depth is 3.75m, the height is 0.3m, the sludge buffer layer is 0.50m, and the total height is 5.48 m. The volume of the mud bucket is 15.11m3. Sludge dischargeAnd mechanically discharging sludge by adopting a sludge slurry pump. The method comprises the following steps: center drive mud scraper: 1, the diameter is 10.5m, the peripheral linear velocity is 2-3 m/min, and the power is 3 kW. An electromagnetic flow meter: split type, 0~400m cultivation/h, 1 platform. Sludge interface instrument: 1, carrying out the following steps.
② biological aerated filter unit
1. 2 sets of aeration biological filter tanks, and single set of aeration biological filter tank has the treatment scale of 65m3The designed filtration speed is 4.81m/H, the biological aerated filter is 3.2 multiplied by 4.8 multiplied by 5.4m (H), the height H =5.4m, a coal columnar active carbon filter material (the diameter of the filter material is 4-6mm, the length is 10 mm) is adopted, the iodine adsorption value of the active carbon is more than or equal to 800mg/g, and the specific surface area is 900-1100m2Per g, less than 10% of water, more than 90% of strength and 0.35-0.55g/cm of packing density3The thickness of the filter material is 1.0 m. The thickness of the ceramsite filter material is 1.8m, and the particle size of the filter material is 2-4 mm. And (4) matching with a pneumatic valve. The empty bed residence time was 40 min. BOD5Volume loading 2.23kgBOD5/（m3D). Aeration strength: the gas-water ratio is 5: 1. The strength of gas backwashing is 12L/m2And S. The water backwashing strength is 4.8L/m2And S. A fan is configured: q =11.89m3H =58.8KPa, N =22kW, 1250r/min, 3 stations (2 with 1 cold standby), frequency conversion control. Backwashing a water pump: q =250m3// H, H =21m, N =22KW, 2 stations (1 with 1).
② ultrafiltration unit
The added 1 set of ultrafiltration device produces 130m of water3// h, flux 38.69L/m2H, single set of 42 pieces 80m2The ultrafiltration membrane is additionally provided with 1 set of ultrafiltration device and the existing ultrafiltration system which are connected in parallel for operation.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A treatment system for underground water surface III of a high-turbidity coal mine comprises a coagulating sedimentation system (1), an intermediate water tank (2), a water purifier (3), a filter (4), an ultrafiltration device (5), a clean water tank (6), a sludge treatment system (9) and a sludge tank (10), and is characterized by further comprising a pretreatment workshop (7) and an advanced treatment workshop (8), wherein the pretreatment workshop is provided with a primary sedimentation device and a pre-sedimentation device (7); the advanced treatment workshop (8) is positioned between the pretreatment workshop (7) and the clean water tank (6), and the advanced treatment workshop (8) is provided with a biological filter tank system and an ultrafiltration system (20).
2. The treatment system for the underground water surface III of the high-turbidity coal mine according to claim 1, wherein the primary sedimentation device comprises a primary sedimentation tank (11), the pre-sedimentation device comprises a pre-sedimentation regulating tank (12), a pre-sedimentation device (13) and a pre-treatment filter (14), the underground water (16) is connected to the primary sedimentation tank (11), the outlet of the primary sedimentation tank (11) is connected with the pre-sedimentation regulating tank (12), and a sludge outlet of the primary sedimentation tank (11) is connected with a sludge well (15); the effluent of the pre-settling regulating tank (12) is respectively connected with a coagulating sedimentation system (1) and a pre-settling device (13), the effluent of the coagulating sedimentation system (1) and the pre-settling device (13) is introduced into an intermediate water tank (2), the effluent of the intermediate water tank (2) is introduced into a pretreatment filter (14), and the effluent of the pretreatment filter (14) is introduced into a biological filter system;
the biological filter system comprises a biological filter (17), wherein the inlet of the biological filter (17) is connected with a pretreatment filter (14), the water outlet of the biological filter (17) is connected with an intermediate water tank (18), and the water outlet of the intermediate water tank (18) is connected with a self-cleaning filter (19); the outlet water of the self-cleaning filter (19) is communicated with the ultrafiltration system (20), the water outlet of the ultrafiltration system (20) is connected with an ultrafiltration water production tank (21), the water inlet of the ultrafiltration water production tank (21) is also connected with the outlet water of the ultrafiltration device (5), and the outlet water of the ultrafiltration water production tank (21) is communicated with the clean water tank (6);
the sludge outlets of the sludge well (15), the pre-settling regulating tank (12), the pre-settling device (13) and the coagulating sedimentation system (1) are all communicated with the sludge tank (10).
3. The treatment system for the underground water surface III of the high-turbidity coal mine is characterized in that the intermediate water tank (3) is provided with an aeration and oxygenation mechanism, the water outlet of the intermediate water tank is also connected with a water purifier (3), the outlet of the water purifier (3) is communicated with an ultrafiltration device (5) after passing through a filter (4), and the water outlet of the ultrafiltration device (5) is communicated with an ultrafiltration water production tank (21).
4. The treatment system for the underground water surface III of the high-turbidity coal mine is characterized in that the sludge tank (10) is connected with a sludge treatment system (9) and a backwashing water collecting tank (22), and the backwashing water collecting tank (22) is connected with the pre-settling adjusting tank (12).
5. A high turbidity coal mine underground water surface iii treatment system according to claim 2, wherein the peripheral wall of the biological filter (17) is of a napping treatment structure; an interception screen is arranged in the clear water area of the biological filter (17) and is away from the top of the filter material; the biological filter is connected with a biological filter backwashing pump (23) and a backwashing fan, and the biological filter backwashing pump (23) is connected with the middle water tank (18).
6. The treatment system for the underground water surface III of the high-turbidity coal mine according to claim 2, wherein the ultrafiltration system (20) is provided with a chemical cleaning and on-line cleaning system, and an ultrafiltration backwashing pump (24) is arranged between the ultrafiltration water production tank (21) and the ultrafiltration system (20).
7. A treatment process for underground water expression earth surface III of a high-turbidity coal mine is characterized by comprising the following steps:
lifting mine water from an underground sump and then entering a primary sedimentation tank to remove large particles;
the effluent of the primary sedimentation tank automatically flows into a pre-sedimentation regulating tank, and the pre-sedimentation regulating tank respectively lifts the mine water to a coagulating sedimentation system and a pre-settler for coagulating sedimentation treatment;
the effluent of the coagulating sedimentation system enters an intermediate water tank for aeration and oxygenation, the intermediate water tank conveys the mine water to a water purifier and a filter for treatment, the effluent of the filter enters an ultrafiltration device for treatment, the effluent of the ultrafiltration device enters an ultrafiltration water production tank, and then enters a clean water tank for recycling or standard discharge after being disinfected by sodium hypochlorite;
the middle water tank conveys the mine water into a pretreatment filter and a biological filter in sequence, and the outlet water of the biological filter enters a middle water tank;
the effluent of the intermediate water tank sequentially passes through the self-cleaning filter and the ultrafiltration system to further ensure the quality of the effluent, and the effluent of the ultrafiltration system enters the ultrafiltration water production tank and then enters the clean water tank to be recycled or discharged after being disinfected by sodium hypochlorite.
8. The process of claim 7, wherein the primary sedimentation tank is a radial sedimentation tank; the surface load of the primary sedimentation tank is less than or equal to 3.6m3/m2H, the settling time is more than or equal to 1.5h, and the load of an effluent weir is less than or equal to 1.7L/s.m.
9. The treatment process of underground water surface III of a high-turbidity coal mine according to claim 7, wherein the biological filter 17 is a combined filter material aeration biological filter which adopts a combination of ceramsite and activated carbon as a filter material; the filtering speed of the biological filter is as follows: 6-7 m/h, the empty bed residence time is more than or equal to 30min, and the thickness of the zeolite filter material is as follows: 1.5-2 m, thickness of the active carbon filter material: 1 to 1.5m, an iodine adsorption value of the activated carbon of greater than or equal to 900mg/g, a specific surface area of 900-2Per g, strength greater than 90%, packing density 0.35-0.55g/cm3The particle size of the ceramsite filter material is as follows: 2-6 mm.
10. The process of claim 7, wherein the ultrafiltration system comprises one or more sets, and the ultrafiltration membrane flux is 33-40L/m2.h。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113336348A (en) * | 2021-05-31 | 2021-09-03 | 国能神东煤炭集团有限责任公司 | Device and method for removing emulsion and boron in mine water pretreatment effluent |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113336348A (en) * | 2021-05-31 | 2021-09-03 | 国能神东煤炭集团有限责任公司 | Device and method for removing emulsion and boron in mine water pretreatment effluent |
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