CN214400133U - Moderate step-by-step cooperative pretreatment device for mine water treatment - Google Patents
Moderate step-by-step cooperative pretreatment device for mine water treatment Download PDFInfo
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- CN214400133U CN214400133U CN202023253203.1U CN202023253203U CN214400133U CN 214400133 U CN214400133 U CN 214400133U CN 202023253203 U CN202023253203 U CN 202023253203U CN 214400133 U CN214400133 U CN 214400133U
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Abstract
The utility model provides a moderate degree substep is preprocessing device in coordination for mine water treatment. A moderate step-by-step cooperative pretreatment device for mine water treatment comprises a primary pretreatment unit, a primary concentration unit, a secondary pretreatment unit, a secondary concentration unit, a tertiary pretreatment unit, a tertiary concentration unit and an evaporative crystallization unit which are sequentially connected in series; the first-stage concentration unit, the second-stage concentration unit, the third-stage concentration unit and the evaporative crystallization unit are connected with a product water tank. The utility model discloses with satisfying the concentrated processing of stage as the purpose, not carrying out the excess treatment, reduce the chemical softening and remove hard silicon removal processing scale, improve medicament efficiency, reduce the ion exchange scale, reduce regeneration waste liquid quantity, practice thrift investment and working costs by a wide margin.
Description
Technical Field
The utility model relates to a mine pretreatment of water device, in particular to moderate degree substep is preprocessing device in coordination for mine water treatment belongs to waste water treatment technical field.
Background
The thirteen-five program of the development of the coal industry indicates that the specific gravity of the coal consumption in China is about 58 percent by 2020, and the coal is still the main energy form in China for a long time. With the optimization of the layout of coal production and development, the coal development is further centralized to large coal bases, and the yield of 14 large coal bases accounts for more than 95% of the whole country, wherein the yield of 23.1 hundred million tons of coal in western regions represented by Mongolia, Shaanxi and Xinjiang accounts for 59.2% of the whole country. The water resource and the coal resource are distributed reversely, the areas are in arid and semi-arid areas, the water resource is lack, the vegetation is rare, the ecological environment is fragile, and the water consumption of coal mines and related industries is short; the mine water is mostly high-salinity mine water, TDS is more than or equal to 1000mg/L, and the mine water cannot be utilized after being simply treated; meanwhile, because of lack of a receiving water body, surface water and soil loss, salinization, vegetation withering and the like caused by discharge can be caused, so that the TDS of the existing mine water discharge is limited by the multi-site environmental protection department, the TDS is required to be less than or equal to 1600mg/L in Shandong, Lu, West and south areas, the mine water zero discharge is required to be realized or the TDS is less than or equal to 1000mg/L in the three types of sanitary standards for drinking water and sanitary standards for surface water environment and quality standards for inner Mongolia and Erdos and the like; the requirement of the national ecological environmental protection department of newly-built coal mines is clear, and the TDS of the discharged mine water is less than or equal to 1000 mg/L. Aiming at the water demand and discharge limitation of large coal bases, the mine water is subjected to advanced treatment, concentration, crystallization and salt separation, so that the zero emission of the mine water is realized, a large amount of high-quality domestic and production water is obtained, and the method is a necessary choice for solving the problem of water shortage of the large coal bases and environmental protection.
Membrane concentration is required in the mine water zero-discharge treatment process, the inlet water quality is required to be stable in the membrane concentration process, SS is extremely low, turbidity is less than or equal to 5NTU, scaling tendency of various insoluble salts is less than or equal to 80%, and the like, which are extremely strict requirements on mine water. Because the mine water is a natural water body existing underground, the soluble salts causing scaling are different along with the occurrence environment and the rock stratum types, some have extremely high sulfate radicals, some have extremely high bicarbonate radicals, some have extremely high calcium and magnesium, some have extremely high iron and manganese, and no rule can be followed; meanwhile, coal dust, rock dust and other suspended matters entering mine water in the coal mining process are also key factors influencing mine water film concentration treatment. How to carry out pretreatment economically and efficiently is the key to the success of zero discharge of mine water.
At present, the conventional method is to adopt a high-efficiency reverse osmosis (HERO) process or a similar HERO process before membrane concentration treatment, and reduce suspended matters and easily-scaling substances such as calcium, magnesium, silicon, boron and the like in mine water at one time through unit processes such as coagulation, precipitation, medicament softening, filtration, ion exchange and the like. The method has the defects of large medicament softening scale, large medicament adding amount, low medicament efficiency, large sludge wastewater amount, large ion exchange scale and large regenerated wastewater amount, and the residual easy-scaling substances such as calcium, magnesium, silicon, boron and the like still have great scaling risk after subsequent concentration, thereby influencing the stable operation of subsequent membrane concentration and evaporative crystallization.
If a moderate stepwise cooperative pretreatment device based on a moderate stepwise cooperative pretreatment process (SPMS2, Synergistic pretreatment of modular and step by step) is researched and developed, key factors influencing each level of concentration treatment are determined according to the water quality characteristics of mine water, targeted and directional removal or reduction is carried out, the treatment degree is flexibly adjusted according to the requirement to fulfill the aim of current level concentration treatment, no excess treatment is carried out, and the device has the outstanding advantages of strong capability of adapting to water quality change, large operation elasticity, small scale of chemical softening and hard silicon removal treatment, high medicament efficiency, small ion exchange scale, small amount of regenerated waste liquid, low investment and operating cost and the like, so that the device has wide technical advancement and beneficial effects and has important significance for solving the problem of mine water pretreatment in the technical field.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a moderate degree substep is preprocessing device in coordination for mine water treatment carries out pertinence, directional getting rid of or reducing according to the quality of water characteristics of mine water, avoids the excess treatment, can practice thrift investment and working costs by a wide margin.
The utility model provides a technical scheme that its technical problem adopted is:
a moderate step-by-step cooperative pretreatment device for mine water treatment comprises a primary pretreatment unit, a primary concentration unit, a secondary pretreatment unit, a secondary concentration unit, a tertiary pretreatment unit, a tertiary concentration unit and an evaporative crystallization unit which are sequentially connected in series; the primary pretreatment unit is provided with a primary sludge recycling and circulating system for recycling sludge, the secondary pretreatment unit is provided with a secondary sludge recycling and circulating system for recycling sludge, the tertiary pretreatment unit is provided with a tertiary sludge recycling and circulating system for recycling sludge, and the primary concentration unit, the secondary concentration unit, the tertiary concentration unit and the evaporative crystallization unit are connected with a product water tank.
Preferably, the primary pretreatment unit comprises a mixing regulation tank, a coagulating sedimentation tank, a primary multi-medium filter tank, a primary ultrafilter and a primary ultrafilter which are connected in sequence, and the primary ultrafilter is connected with the primary concentration unit; the first-stage concentration unit comprises a first-stage cartridge filter, a first-stage reverse osmosis device and a first-stage concentrated brine pool which are sequentially connected, and the first-stage reverse osmosis device is connected with a product water pool; the second-stage pretreatment unit comprises a first-stage reaction tank, a high-density sedimentation tank, a second-stage multi-medium filter tank, a second-stage ultrafilter and a second-stage ultrafilter which are connected in sequence, and the second-stage ultrafilter is connected with a second-stage concentration unit; the second-stage concentration unit comprises a second-stage security filter, a second-stage reverse osmosis device and a second-stage concentrated brine pool which are sequentially connected, and the second-stage reverse osmosis device is connected with the product water pool; the third-stage pretreatment unit comprises a second-stage reaction tank, a tubular micro-filter, an ion exchanger, an acid-adding decarbonization tower and a softened water tank which are sequentially connected, and the softened water tank is connected with the third-stage concentration unit; the third-level concentration unit comprises a third-level security filter, a third-level reverse osmosis device and a third-level concentrated brine pond which are sequentially connected, the third-level reverse osmosis device is connected with a product water pond, and the third-level concentrated brine pond is connected with the evaporation crystallization unit.
Preferably, the primary sludge recycling circulating system comprises a primary sludge tank, a primary pressure filter and a primary collecting tank which are sequentially connected, wherein the primary sludge tank is connected with the bottom of the coagulating sedimentation tank, and an outlet of the primary collecting tank is connected with an inlet of the mixing and adjusting tank; the secondary sludge recycling and circulating system comprises a secondary sludge tank, a secondary pressure filter and a secondary collecting tank which are connected in sequence, wherein the secondary sludge tank is connected with the bottom of the high-density sedimentation tank, and an outlet of the secondary collecting tank is connected with an inlet of a primary strong brine tank; the tertiary sludge recycling and circulating system comprises a mixed reaction tank, a tertiary filter press and a tertiary collecting tank which are sequentially connected, wherein the bottom of the mixed reaction tank is connected with a pipe type micro filter, and the outlet of the tertiary collecting tank is connected with the inlet of a secondary strong brine tank.
Preferably, the primary multi-medium filter and the primary ultrafilter are respectively provided with a first backwashing drain pipe used for being connected with the primary collecting tank, the secondary multi-medium filter and the secondary ultrafilter are respectively provided with a second backwashing drain pipe used for being connected with the secondary collecting tank, and the ion exchanger is provided with a third backwashing drain pipe used for being connected with the tertiary collecting tank.
Preferably, the mixing and adjusting tank is arranged between the coagulating sedimentation tank and the coagulating sedimentation tank, between the first-stage multi-medium filter tank and the first-stage ultrafilter, between the first-stage cartridge filter and the first-stage reverse osmosis device, between the first-stage sludge tank and the first-stage filter press, between the first-stage collecting tank and the mixing and adjusting tank, between the first-stage concentrated brine tank and the first-stage reaction tank, between the second-stage multi-medium filter tank and the second-stage ultrafilter, between the second-stage ultrafilter tank and the second-stage cartridge filter, between the second-stage cartridge filter and the second-stage reverse osmosis device, between the second-stage sludge tank and the second-stage filter press, between the second-stage collecting tank and the first-stage concentrated brine tank, between the second-stage concentrated brine tank and the second-stage reaction tank, between the tubular microfilter and the ion exchanger, between the softened water tank and the third-stage cartridge filter, between the third-stage cartridge filter and the third-stage reverse osmosis device, between the mixing reaction tank and the third-stage filter press, And a lifting pump is arranged between the third-stage collecting water tank and the second-stage strong brine tank and between the third-stage strong brine tank and the evaporation crystallization unit.
Preferably, a polyaluminium flocculant or a polyferric flocculant is arranged in the coagulating sedimentation tank, and a polyacrylamide coagulant aid is further arranged in the coagulating sedimentation tank.
Preferably, quartz filter materials with the particle size of 0.5-2.0 mm are arranged in the first-stage multi-medium filter tank and the second-stage multi-medium filter tank.
Preferably, the primary ultrafilter and the secondary ultrafilter are internal pressure type ultrafilters, external pressure type ultrafilters or immersion type ultrafilters, and ultrafiltration membranes of the primary ultrafilter and the secondary ultrafilter are hollow fiber membranes.
Preferably, a roll type brackish water reverse osmosis composite membrane is arranged in the first-stage reverse osmosis device, a roll type brackish water reverse osmosis composite membrane or a roll type seawater reverse osmosis composite membrane is arranged in the second-stage reverse osmosis device, and a roll type high-pressure membrane, a disc tube type reverse osmosis composite membrane or a pipe network type reverse osmosis composite membrane is arranged in the third-stage reverse osmosis device.
Preferably, the ion exchanger is a weak acid cation exchanger or a sodium type ion exchanger.
The utility model has the advantages that:
(1) the utility model discloses a moderate degree substep is preprocessing device in coordination for mine water treatment compares with traditional preprocessing device or high-efficient reverse osmosis (HERO) device, the utility model discloses confirm the key factor who influences each level concentrated treatment according to the quality of water characteristics of mine water, carry out pertinence, directional get rid of or reduce, device treatment degree is adjusted as required in a flexible way to satisfy when level concentrated treatment for the purpose, do not carry out excess treatment, reduce the chemical softening and remove the silicon treatment scale, improve medicament efficiency, reduce the ion exchange scale, reduce regeneration waste liquid quantity, practice thrift investment and working costs by a wide margin.
(2) The utility model obtains the coal slime through the primary sludge recycling and circulating system, the heat value of the coal slime is above 2000kJ/kg, and the coal slime can be comprehensively utilized as low heat value fuel; a small amount of sludge is generated through the secondary sludge recycling system and the tertiary sludge recycling system, and compared with a conventional pretreatment device, the treatment amount of solid waste is reduced, and the environment is protected.
(3) The utility model discloses a back flush water is retrieved to one, two, tertiary sludge recycling circulation system and is handled it, not only avoids outer sewage of arranging to pollute the natural water, reduces sewage matter concentration moreover, is convenient for handle sewage.
(4) The utility model discloses can collect one, two, tertiary reverse osmosis product water and evaporation unit steam condensate, can satisfy high-quality production, domestic water as the product water and supply the colliery to use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. a first-stage pretreatment unit, 2, a first-stage concentration unit, 3, a second-stage pretreatment unit, 4, a second-stage concentration unit, 5, a third-stage pretreatment unit, 6, a third-stage concentration unit, 7, an evaporation crystallization unit, 8, a first-stage sludge recycling circulating system, 9, a second-stage sludge recycling circulating system, 10, a third-stage sludge recycling circulating system, 11, a product water tank, 12, a first back flushing drain pipe, 13, a second back flushing drain pipe, 14, a third back flushing drain pipe, 15, a lifting pump, 101, a mixing and adjusting tank, 102, a coagulating sedimentation tank, 103, a first-stage multi-medium filter tank, 104, a first-stage ultrafilter, 105, a first-stage ultrafilter, 201, a first-stage cartridge filter, 202, a first-stage reverse osmosis device, 203, a first-stage concentrated salt water tank, 301, a first-stage reaction tank, 302, a high-density sedimentation tank, 303, a second-stage multi-medium filter tank, 304, a second-stage ultrafilter, 305, a high-stage ultrafilter, a high-density filter tank, a high-density filter, a high-pressure filter, a high, A second-stage super filter tank 401, a second-stage cartridge filter 402, a second-stage reverse osmosis device 403, a second-stage concentrated brine tank 501, a second-stage reaction tank 502, a tubular micro filter 503, an ion exchanger 504, an acid-adding decarbonization tower 505, a softened water tank 601, a third-stage cartridge filter 602, a third-stage reverse osmosis device 603, a third-stage concentrated brine tank 801, a first-stage sludge tank 802, a first-stage filter press 803, a first-stage collecting water tank 901, a second-stage sludge tank 902, a second-stage filter press 903, a second-stage collecting water tank 1001, a mixed reaction tank 1001, a 1002, a third-stage filter press 1003 and a third-stage collecting water tank.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific embodiments and with reference to the accompanying drawings. It is to be understood that the practice of the present invention is not limited to the following examples, and that any modifications and/or changes in form made to the present invention are intended to fall within the scope of the present invention.
In the utility model, all parts and percentages are weight units, and the adopted equipment, raw materials and the like can be purchased from the market or commonly used in the field if not specified. The methods in the following examples are conventional in the art unless otherwise specified. The components or devices in the following examples are, unless otherwise specified, standard parts or parts known to those skilled in the art, the structure and principle of which are known to those skilled in the art through technical manuals or through routine experimentation.
Example (b):
the moderate stepwise cooperative pretreatment device for mine water treatment as shown in fig. 1 comprises a primary pretreatment unit 1, a primary concentration unit 2, a secondary pretreatment unit 3, a secondary concentration unit 4, a tertiary pretreatment unit 5, a tertiary concentration unit 6 and an evaporative crystallization unit 7 which are sequentially connected in series. The primary pretreatment unit is provided with a primary sludge recycling and circulating system 8 for recycling and circulating sludge, the secondary pretreatment unit is provided with a secondary sludge recycling and circulating system 9 for recycling and circulating sludge, the tertiary pretreatment unit is provided with a tertiary sludge recycling and circulating system 10 for recycling and circulating sludge, and the primary concentration unit, the secondary concentration unit, the tertiary concentration unit and the evaporative crystallization unit are connected with a product water tank 11.
The primary pretreatment unit comprises a mixing regulation tank 101, a coagulating sedimentation tank 102, a primary multi-medium filter tank 103, a primary ultrafilter 104 and a primary ultrafilter tank 105 which are connected in sequence, and the primary ultrafilter tank is connected with a primary concentration unit.
The first-stage concentration unit comprises a first-stage cartridge filter 201, a first-stage reverse osmosis device 202 and a first-stage concentrated brine pond 203 which are sequentially connected, and the first-stage reverse osmosis device is connected with a product pond.
The second-stage pretreatment unit comprises a first-stage reaction tank 301, a high-density sedimentation tank 302, a second-stage multi-medium filter tank 303, a second-stage ultrafilter 304 and a second-stage ultrafilter tank 305 which are connected in sequence, and the second-stage ultrafilter tank is connected with a second-stage concentration unit.
The second-stage concentration unit comprises a second-stage cartridge filter 401, a second-stage reverse osmosis device 402 and a second-stage concentrated brine pond 403 which are sequentially connected, and the second-stage reverse osmosis device is connected with a product pond.
The third-stage pretreatment unit comprises a second-stage reaction tank 501, a tubular micro-filter 502, an ion exchanger 503, an acid-adding decarbonization tower 504 and a softened water tank 505 which are connected in sequence, and the softened water tank is connected with the third-stage concentration unit.
The third-level concentration unit comprises a third-level cartridge filter 601, a third-level reverse osmosis device 602 and a third-level concentrated brine pond 603 which are sequentially connected, the third-level reverse osmosis device is connected with a product pond, and the third-level concentrated brine pond is connected with an evaporation crystallization unit.
The primary sludge recycling circulating system comprises a primary sludge tank 801, a primary pressure filter 802 and a primary collecting tank 803 which are sequentially connected, the primary sludge tank is connected with the bottom of the coagulating sedimentation tank, and the outlet of the primary collecting tank is connected with the inlet of the mixing and adjusting tank.
The second-stage sludge recycling circulating system comprises a second-stage sludge pool 901, a second-stage filter press 902 and a second-stage collecting pool 903 which are sequentially connected, wherein the second-stage sludge pool is connected with the bottom of the high-density sedimentation tank, and the outlet of the second-stage collecting pool is connected with the inlet of a first-stage strong brine pool.
Tertiary sludge recycling circulation system is including the mixed reaction tank 1001, tertiary pressure filter 1002 and the tertiary pond 1003 of collecting that connects gradually, and the mixed reaction tank connecting pipe formula microstrainer bottom, tertiary pond exit linkage second grade strong brine pond entry.
The primary multi-medium filter and the primary ultra-filter are both provided with a first back-washing drain pipe 12 for connecting the primary collecting pool, the secondary multi-medium filter and the secondary ultra-filter are both provided with a second back-washing drain pipe 13 for connecting the secondary collecting pool, and the ion exchanger is provided with a third back-washing drain pipe 14 for connecting the tertiary collecting pool.
Between the mixing and adjusting tank and the coagulating sedimentation tank, between the first-stage multi-medium filter tank and the first-stage ultrafilter, between the first-stage ultrafilter tank and the first-stage security filter, between the first-stage security filter and the first-stage reverse osmosis device, between the first-stage sludge tank and the first-stage filter press, between the first-stage collecting tank and the mixing and adjusting tank, between the first-stage concentrated brine tank and the first-stage reaction tank, between the second-stage multi-medium filter tank and the second-stage ultrafilter, between the second-stage ultrafilter tank and the second-stage security filter, between the second-stage security filter and the second-stage reverse osmosis device, between the second-stage sludge tank and the second-stage filter press, between the second-stage collecting tank and the first-stage concentrated brine tank, between the second-stage concentrated brine tank and the second-stage reaction tank, between the tubular microfilter and the ion exchanger, between the softened water tank and the third-stage security filter, between the third-stage security filter and the third-stage reverse osmosis device, between the mixing reaction tank and the third-stage filter press, And a lifting pump 15 is arranged between the third-stage collecting water tank and the second-stage strong brine tank and between the third-stage strong brine tank and the evaporation crystallization unit.
The first-stage ultrafilter and the second-stage ultrafilter are internal pressure type ultrafilters, external pressure type ultrafilters or immersion type ultrafilters, and the ultrafiltration membranes of the first-stage ultrafilter and the second-stage ultrafilter are hollow fiber membranes.
The first-stage reverse osmosis device is internally provided with a rolled type brackish water reverse osmosis composite membrane, the second-stage reverse osmosis device is internally provided with a rolled type brackish water reverse osmosis composite membrane or a rolled type seawater reverse osmosis composite membrane, and the third-stage reverse osmosis device is internally provided with a rolled type high-pressure membrane, a disc-tube type reverse osmosis composite membrane or a pipe-network type reverse osmosis composite membrane.
The ion exchanger is weak acid cation exchanger or sodium ion exchanger.
The working steps of the device are as follows: mixing mine water containing suspended matters such as coal dust, rock powder and the like and insoluble salts such as calcium, magnesium, silicon and the like with effluent water of a primary water collection tank, pumping the mixture to a coagulation sedimentation tank through a lifting pump, adding a polyaluminium flocculant or a polyferric flocculant, then adding a Polyacrylamide (PAM) coagulant aid to flocculate and precipitate suspended matters in the water, then overflowing supernatant after precipitation to a primary multi-medium filter tank, arranging a quartz stone filter material with the particle size of 0.5-2.0 mm in the primary multi-medium filter tank, filtering and continuously removing the suspended matters in the water, pumping the filtrate to a primary ultrafilter to remove granular pollutants, colloidal pollutants and residual suspended matters in the filtrate, reducing the turbidity of the water, adding a scale inhibitor into the ultrafiltered effluent water, controlling the scaling tendency to be less than or equal to 80%, then feeding the mine water into a primary security filter to filter, filtering and further removing the suspended matters, wherein the turbidity is less than or equal to 5NTU, and feeding the primary security filter into a primary reverse osmosis filter to perform concentration treatment, to obtain first-stage reverse osmosis product water and first-stage reverse osmosis concentrated water. Sludge discharged from the bottom of the coagulating sedimentation tank is collected by a primary sludge tank, and then is sent to a primary filter press for concentration and filter pressing to form coal slime with the water content less than or equal to 60 percent, and the coal slime is comprehensively utilized as low-calorific-value fuel; and the compressed liquid of the first-stage filter press, the backwash liquid of the first-stage quartz sand filter tank and the backwash liquid of the first-stage ultrafiltration are collected by the first-stage collecting water tank and then are sent to the mixing and regulating tank.
The concentration of calcium, magnesium and silicon in the concentrated water after the first-stage reverse osmosis concentration is improved to 3-5 times of the original concentration, the concentrated water is collected by a first-stage concentrated brine tank and then is pumped into a first-stage reaction tank, chemical agents such as lime, magnesium agent and a small amount of liquid caustic soda are added into the first-stage reaction tank, and Mg (OH) is generated through reaction2、CaCO3Chemical precipitation sludge with silicon, and conveying the discharged water of the reaction tank to a high-density sedimentation tank to flocculate and precipitate suspended matters in the sludge; then, overflowing the supernatant after precipitation to a secondary multi-medium filter tank, wherein a quartz filter material with the particle size of 0.5-2.0 mm is arranged in the secondary multi-medium filter tank, filtering to continuously remove suspended matters in water, and removing particle pollutants, colloid pollutants and residual suspended matters in the water through a secondary ultrafilter to reduce the turbidity of the water; the secondary ultrafiltration effluent is filtered by a secondary security filter to further remove suspended matters, and the secondary security filter effluent isThe residual calcium, magnesium and silicon in the water are reduced to below 50mg/L, and the water enters a second-stage reverse osmosis concentration treatment to obtain a second-stage reverse osmosis product water and a second-stage reverse osmosis concentrated water. Collecting sludge discharged from the bottom of the high-density sedimentation tank through a secondary sludge tank, and conveying the sludge to a secondary filter press for filter pressing to form sludge mainly comprising Mg (OH)2、CaCO3After filter pressing, the water content is reduced to below 65 percent and the solid waste is used for landfill; and the compressed liquid of the second-stage filter press, the backwashing liquid of the second-stage multi-medium filter tank and the second-stage ultrafiltration backwashing liquid are collected by the second-stage collecting water tank and then are sent to the first-stage concentrated brine tank.
The concentration of calcium, magnesium and silicon in the concentrated water concentrated by the secondary reverse osmosis device is increased to about 50-250mg/L, the concentrated water is collected by a secondary concentrated brine pool and then is pumped to a secondary reaction tank, lime, magnesium agent, a small amount of liquid caustic soda and the like are added into the secondary reaction tank to form precipitates with the calcium, the magnesium and the silicon, the reaction tank discharges water and sends the water to a tubular micro-filter, and suspended matter precipitates are filtered; then the effluent of the tubular microfilter is pumped to an ion exchanger by a lifting pump, residual hardness ions in the effluent are removed by ion exchange, the effluent of the ion exchanger is sent to an acid-adding decarbonization tower, the pH value is adjusted to be acidic, and CO is blown off by the decarbonization tower2After treatment, the calcium, magnesium and silicon are reduced to be below 0.03mmol/L, and decarbonization liquid is collected by a softened water tank and then is sent to a three-level cartridge filter for filtration, so that the turbidity of water quality is further reduced to meet the requirement of three-level reverse osmosis water inlet; and the filtrate of the third-stage cartridge filter is sent to third-stage reverse osmosis by a lifting pump to obtain third-stage reverse osmosis product water and third-stage reverse osmosis concentrated water.
The mud discharged by the tubular microfilter and the regenerated waste liquid discharged by the ion exchanger are treated by a mixed reaction tank, and then sent to a three-stage filter press for concentration and filter pressing to form sludge, the main component of which is Mg (OH)2、CaCO3After filter pressing, the water content is reduced to below 65 percent and the solid waste is used for landfill; and the compressed liquid of the third-stage filter press is collected by the third-stage collecting water tank and then is sent to the second-stage concentrated brine tank.
And the third-level reverse osmosis concentrated water is collected by a third-level concentrated brine pond and then is sent to an evaporation crystallization unit, and crystallization and salt separation treatment are carried out to obtain a crystallization product salt, miscellaneous salt and steam condensate.
The first, second and third stage reverse osmosis produced water and steam condensate enter a product water pool to be used as product water, and the product water can be used for high-quality production and domestic water for coal mines.
The following is an example of performing zero emission treatment on coal mine water, the coal mine water amount is 600t/h, SS is between 155 and 1032mg/L, TDS is about 3560mg/L, calcium and magnesium content is medium, and the water quality indexes of all units in the coal mine water zero emission treatment process are shown in Table 1.
TABLE 1 Water quality indexes of units in coal mine water zero-discharge treatment process
If the removal rate of the direct medicament softening calcium ions is only about 60 percent according to the conventional device, the magnesium ions and the silicon are not removed basically, and the scale of the treatment devices for hardness removal softening, ion exchange and the like reaches 600 t/h.
Adopt the utility model discloses a PAC28.5mg/L, PAM0.3mg/L are thrown to the device, filter through the many medium filter of one-level after the intensive mixing reaction, and the effluent turbidity is between 3.5-10.5NTU, later gets into the one-level ultrafiltration, and the effluent turbidity reduces to below 0.3 NTU. Scale inhibition analysis shows that the easily-scaling components are calcium carbonate and calcium sulfate, 2.37mg/L of scale inhibitor is added into primary ultrafiltration effluent, then the mine water enters a primary security filter, suspended matters are further removed by filtration, the effluent of the primary security filter enters a primary reverse osmosis device for treatment, and the primary concentration recovery rate can reach 75%.
Sludge discharged from the bottom of the coagulating sedimentation tank is collected by a primary sludge tank, and then is sent to a primary filter press for concentration and filter pressing to form coal slime with the water content of 60 percent, the heat value is about 2750kJ/kg, and the coal slime is comprehensively utilized as low-heat-value fuel; the compressed liquid of the first-stage filter press, the backwash liquid of the first-stage multi-medium filter tank and the backwash liquid of the first-stage ultrafiltration are collected by a first-stage collecting water tank and then sent to a mixing and regulating tank.
The TDS of the concentrated water after the first-stage concentration is increased to 14500mg/LThe calcium, magnesium and silicon are respectively increased to 230mg/L, 80mg/L and 60 mg/L. The second-stage pretreatment unit adopts a first-stage reaction tank, a high-density sedimentation tank, a second-stage multi-medium filter tank and a second-stage ultrafiltration device, lime, a magnesium agent and a small amount of liquid caustic soda are added into the first-stage reaction tank, and Mg (OH) is generated by reaction2、CaCO3The sludge is chemically precipitated with the silicon, and the water discharged from the first-stage reaction tank is sent to a high-density sedimentation tank to flocculate and precipitate suspended matters in the sludge; then supernatant after precipitation overflows to a secondary multi-medium filter, suspended matters in water are continuously removed by filtration, and particle pollutants, colloid pollutants and residual suspended matters in the water are removed by secondary ultrafiltration to reduce the turbidity of the water; and the secondary ultrafiltration effluent is filtered by a secondary cartridge filter to further remove suspended matters and then enters secondary reverse osmosis concentration treatment. The scale of hardness removal and softening of the secondary pretreatment unit is reduced to 150t/h, calcium, magnesium and silicon in inlet water of the secondary reverse osmosis device are respectively 19.11mg/L, 19.83mg/L and 18.62mg/L, the removal rate is improved to 92%, 75% and 69%, and the medicament efficiency is greatly improved.
And the scale inhibitor is not required to be added into the secondary concentration device, and the reverse osmosis recovery rate is 76%. Collecting sludge discharged from the bottom of the high-density sedimentation tank through a secondary sludge tank, and conveying the sludge to a secondary filter press for filter pressing to form sludge mainly comprising Mg (OH)2、CaCO3After filter pressing, the water content is reduced to 62 percent and the solid waste is used for landfill; and the compressed liquid of the second-stage filter press, the backwashing liquid of the second-stage multi-medium filter tank and the second-stage ultrafiltration backwashing liquid are collected by the second-stage collecting water tank and then are sent to the first-stage concentrated brine tank.
After the secondary concentration, the TDS of the concentrated water is increased to more than 51000mg/L, and the calcium, the magnesium, the silicon, the boron and the bicarbonate are respectively concentrated to more than 79mg/L, 73mg/L, 9.98mg/L and 483 mg/L. The third-stage pretreatment unit adopts a second-stage reaction tank, a tubular micro-filter, an ion exchanger and an acid-adding decarbonization tower, lime, a magnesium agent, a small amount of liquid caustic soda and the like are added into the second-stage reaction tank to form precipitates with calcium, magnesium and silicon, the reaction tank drains water and is sent to the tubular micro-filter, and suspended matter precipitates are filtered; then the effluent of the tubular microfilter is pumped to an ion exchanger by a lifting pump, residual hardness ions in the effluent are removed by ion exchange, the effluent of the ion exchanger is sent to an acid-adding decarbonization tower, the pH value is adjusted to be acidic, and CO is blown off by the decarbonization tower2The decarbonization liquid is collected by a softening water tank and then is sent to a three-level security filter for filtration, the turbidity of the water is further reduced, and the filtrate of the three-level security filter is sent to a three-level reverse osmosis concentration treatment by a lifting pump.
The scales of a secondary reaction pool, an ion exchanger and an acid-adding decarbonization tower for removing hardness and softening in the third-stage pretreatment unit are all 36t/h, calcium, magnesium, silicon, boron and bicarbonate radical in the inlet water of the third-stage reverse osmosis device are respectively reduced to 0.4mg/L, 0.5mg/L, 4.77mg/L, 0.98mg/L and 33mg/L, the removal rate is 99%, 93%, 90% and 93%, and the medicament efficiency is greatly improved. The scale inhibitor is not required to be added into the third-stage concentration device, and the reverse osmosis recovery rate is 50%; and concentrated water of the third-stage reverse osmosis device is collected by the third-stage strong brine pond and then enters the evaporation crystallization unit. The mud discharged by the tubular microfilter and the regenerated waste liquid discharged by the ion exchanger are treated by a mixed reaction tank, and then sent to a three-stage filter press for concentration and filter pressing to form sludge, the main component of which is Mg (OH)2、CaCO3After filter pressing, the water content is reduced to 65 percent and the solid waste is buried; and the compressed liquid of the third-stage filter press is collected by the third-stage collecting water tank and then is sent to the second-stage concentrated brine tank.
All the reverse osmosis produced water and the steam condensate produced by the evaporation and crystallization unit are used as product water together, and the product water can be used for high-quality production and domestic water for coal mines.
The total scale of hardness and softening is 186t/h, the scale of ion exchange and decarburization is 36t/h, which is only 31 percent and 6 percent of the corresponding unit scale in the conventional pretreatment process, and the construction investment and the operating cost are greatly reduced.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the scope of the claims.
Claims (10)
1. A moderate substep cooperative pretreatment device for mine water treatment is characterized in that: the moderate step-by-step cooperative pretreatment device for mine water treatment comprises a primary pretreatment unit, a primary concentration unit, a secondary pretreatment unit, a secondary concentration unit, a tertiary pretreatment unit, a tertiary concentration unit and an evaporative crystallization unit which are sequentially connected in series; the primary pretreatment unit is provided with a primary sludge recycling and circulating system for recycling sludge, the secondary pretreatment unit is provided with a secondary sludge recycling and circulating system for recycling sludge, the tertiary pretreatment unit is provided with a tertiary sludge recycling and circulating system for recycling sludge, and the primary concentration unit, the secondary concentration unit, the tertiary concentration unit and the evaporative crystallization unit are connected with a product water tank.
2. The moderate stepwise cooperative pretreatment device for mine water treatment according to claim 1, characterized in that: the primary pretreatment unit comprises a mixing regulation tank, a coagulating sedimentation tank, a primary multi-medium filter tank, a primary ultrafilter and a primary ultrafilter tank which are connected in sequence, and the primary ultrafilter tank is connected with a primary concentration unit; the first-stage concentration unit comprises a first-stage cartridge filter, a first-stage reverse osmosis device and a first-stage concentrated brine pool which are sequentially connected, and the first-stage reverse osmosis device is connected with a product water pool; the second-stage pretreatment unit comprises a first-stage reaction tank, a high-density sedimentation tank, a second-stage multi-medium filter tank, a second-stage ultrafilter and a second-stage ultrafilter which are connected in sequence, and the second-stage ultrafilter is connected with a second-stage concentration unit; the second-stage concentration unit comprises a second-stage security filter, a second-stage reverse osmosis device and a second-stage concentrated brine pool which are sequentially connected, and the second-stage reverse osmosis device is connected with the product water pool; the third-stage pretreatment unit comprises a second-stage reaction tank, a tubular micro-filter, an ion exchanger, an acid-adding decarbonization tower and a softened water tank which are sequentially connected, and the softened water tank is connected with the third-stage concentration unit; the third-level concentration unit comprises a third-level security filter, a third-level reverse osmosis device and a third-level concentrated brine pond which are sequentially connected, the third-level reverse osmosis device is connected with a product water pond, and the third-level concentrated brine pond is connected with the evaporation crystallization unit.
3. The moderately stepped and cooperative pretreatment device for mine water treatment according to claim 2, characterized in that: the primary sludge recycling circulating system comprises a primary sludge tank, a primary pressure filter and a primary collecting tank which are sequentially connected, the primary sludge tank is connected with the bottom of the coagulating sedimentation tank, and the outlet of the primary collecting tank is connected with the inlet of the mixing and adjusting tank; the secondary sludge recycling and circulating system comprises a secondary sludge tank, a secondary pressure filter and a secondary collecting tank which are connected in sequence, wherein the secondary sludge tank is connected with the bottom of the high-density sedimentation tank, and an outlet of the secondary collecting tank is connected with an inlet of a primary strong brine tank; the tertiary sludge recycling and circulating system comprises a mixed reaction tank, a tertiary filter press and a tertiary collecting tank which are sequentially connected, wherein the bottom of the mixed reaction tank is connected with a pipe type micro filter, and the outlet of the tertiary collecting tank is connected with the inlet of a secondary strong brine tank.
4. A moderately stepwise cooperative pretreatment device for mine water treatment according to claim 3, characterized in that: the first-stage multi-medium filter and the first-stage ultrafilter are respectively provided with a first backwashing drain pipe used for being connected with the first-stage collecting pool, the second-stage multi-medium filter and the second-stage ultrafilter are respectively provided with a second backwashing drain pipe used for being connected with the second-stage collecting pool, and the ion exchanger is provided with a third backwashing drain pipe used for being connected with the third-stage collecting pool.
5. A moderately stepwise cooperative pre-treatment device for mine water treatment according to claim 3 or 4, characterized in that: between the mixing regulation tank and the coagulating sedimentation tank, between the first-stage multi-medium filter tank and the first-stage ultrafilter, between the first-stage ultrafiltration water tank and the first-stage security filter, between the first-stage security filter and the first-stage reverse osmosis device, between the first-stage sludge tank and the first-stage filter press, between the first-stage collecting water tank and the mixing regulation tank, between the first-stage concentrated brine tank and the first-stage reaction tank, between the second-stage multi-medium filter tank and the second-stage ultrafilter, between the second-stage ultrafiltration water tank and the second-stage security filter, between the second-stage security filter and the second-stage reverse osmosis device, between the second-stage sludge tank and the second-stage filter press, between the second-stage collecting water tank and the first-stage concentrated brine tank, between the second-stage concentrated brine tank and the second-stage reaction tank, between the tubular microfilter and the ion exchanger, between the softened water tank and the third-stage security filter, between the third-stage security filter and the third-stage reverse osmosis, between the mixing reaction tank and the third-stage filter press, And a lifting pump is arranged between the third-stage collecting water tank and the second-stage strong brine tank and between the third-stage strong brine tank and the evaporation crystallization unit.
6. The moderately stepped and cooperative pretreatment device for mine water treatment according to claim 2, characterized in that: the coagulating sedimentation tank is internally provided with a polyaluminium flocculant or a polyferric flocculant and is also internally provided with a polyacrylamide coagulant aid.
7. The moderately stepped and cooperative pretreatment device for mine water treatment according to claim 2, characterized in that: and quartz filter materials with the particle size of 0.5-2.0 mm are arranged in the first-stage multi-medium filter tank and the second-stage multi-medium filter tank.
8. The moderately stepped and cooperative pretreatment device for mine water treatment according to claim 2, characterized in that: the first-stage ultrafilter and the second-stage ultrafilter are internal pressure type ultrafilters, external pressure type ultrafilters or immersion type ultrafilters, and ultrafiltration membranes of the first-stage ultrafilter and the second-stage ultrafilter are hollow fiber membranes.
9. The moderately stepped and cooperative pretreatment device for mine water treatment according to claim 2, characterized in that: the first-stage reverse osmosis device is internally provided with a rolled type brackish water reverse osmosis composite membrane, the second-stage reverse osmosis device is internally provided with a rolled type brackish water reverse osmosis composite membrane or a rolled type seawater reverse osmosis composite membrane, and the third-stage reverse osmosis device is internally provided with a rolled type high-pressure membrane, a disc-tube type reverse osmosis composite membrane or a pipe-network type reverse osmosis composite membrane.
10. The moderately stepped and cooperative pretreatment device for mine water treatment according to claim 2, characterized in that: the ion exchanger is weak acid cation exchanger or sodium ion exchanger.
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