Quality resource utilization and zero emission treatment method for high-turbidity and high-salt mine water

Abstract

The invention provides a high-turbidity and high-salt mine water mass resource utilization and zero-emission treatment method, and aims to solve the technical problems of low mine water mass resource utilization rate and high zero-emission difficulty in the prior art. Comprising the following steps: S1, collecting high-turbidity and high-salt mine water into an underground sump; s2, different treatment modes are selected for treatment according to the water quality resource utilization requirements of the mine water in different mining areas, and the treatment modes include the first treatment mode, the mine water in the underground water sump is sequentially subjected to pretreatment, strengthened pretreatment and mechanical filtration in the water treatment flow direction; in the second treatment mode, the mine water in the underground water sump is sequentially subjected to pretreatment, enhanced pretreatment, mechanical filtration and deep treatment in the water treatment flow direction; in the third treatment mode, the mine water in the underground water sump is sequentially subjected to pretreatment, enhanced pretreatment, mechanical filtration, deep treatment, strong brine treatment and zero emission treatment in the water treatment flow direction. According to the invention, the utilization rate of quality-divided resourceful treatment is high, so that the produced water meets different recycling requirements, and zero emission is realized.

Description

Technical Field

[0001] The invention relates to the technical field of mine water treatment, and in particular to a method for quality resource utilization and zero-emission treatment of high-turbidity and high-salinity mine water. Background Art

[0002] Mine water refers to the wastewater generated by underground water, surface seepage water, and underground production drainage during the construction of coal mines and coal mining. It has the characteristics of diverse water quality types, large fluctuations in water volume and quality, high salt content (TDS), high concentration of suspended solids (SS) and difficulty in sedimentation, and may contain heavy metals, fluorides and other toxic and harmful substances. Untreated or improperly treated mine water will bring about a series of environmental problems, thus threatening the ecosystem and human health. Therefore, the reasonable resource recycling of mine water after treatment and purification is in line with the needs of my country's ecological environment and social and economic development.

[0003] Generally speaking, the SS and TDS of mine water are generally several hundred to several thousand mg / L, and some SS are even as high as 10,000 mg / L and TDS as high as 8,000 mg / L. Highly turbid mine water generally refers to mine water with SS exceeding 500 mg / L, and its suspended matter components mainly include coal powder, rock powder, silt, etc. The main goal of this type of water treatment is to remove SS so that the water reaches a certain clarity and water quality standard, and then it can be reused for industrial and domestic water. High-salinity mine water, that is, mine water with TDS exceeding 1,000 mg / L, will cause a series of harms to the environment if it is simply treated or directly discharged without treatment, especially in the mining areas in the middle and upper reaches of the Yellow River Basin. Due to low rainfall, high evaporation, and poor groundwater recharge, runoff and discharge conditions, the TDS of groundwater and mine water in some mining areas exceeds the standard seriously. High-turbidity and high-salinity mine water combines the characteristics of the above two types of mine water. It has problems such as high turbidity, high salinity, complex chemical composition, large fluctuations in water quality, great difficulty in treatment, and high treatment costs using conventional methods. It accounts for a high proportion of coal mine water in my country, and there is an urgent need to develop targeted process technologies, equipment and solutions.

[0004] At present, the resource treatment of high-turbidity and high-salinity mine water still has problems such as the difficulty of in-situ treatment underground, high energy consumption of treatment above ground, low efficiency of pretreatment and hardness removal, low flux of ultrafiltration (UF) membrane components and serious pollution of reverse osmosis (RO) membranes, and the inability to efficiently achieve resource treatment and zero emissions. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and provide a method for quality resource utilization and zero-emission treatment of high-turbidity and high-salinity mine water.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for resource utilization and zero-emission treatment of high-turbidity and high-salt mine water, comprising:

[0008] S1, collects high-turbidity and high-salinity mine water into the underground water tank;

[0009] S2, according to the needs of different mining areas for the utilization of mine water resources, different processing modes are selected for quality-based processing, and the processing modes include:

[0010] Treatment mode 1: pre-treating, strengthening pre-treating and mechanically filtering the mine water in the underground water tank in sequence along the water treatment flow direction, wherein the pre-treatment and the strengthening pre-treatment are completed underground, and the mechanical filtration is completed underground or above ground; the produced water treated by the treatment mode 1 meets the reuse requirements of the "Design Code for Firefighting and Sprinkling in Underground Coal Mines" (GB50383) and the "Design Code for Coal Washing Engineering" (GB50359);

[0011] Treatment mode 2: pre-treating, strengthening pre-treatment, mechanical filtration and deep treatment are carried out on the mine water in the underground water tank in sequence along the water treatment flow direction, wherein the pre-treatment and the strengthening pre-treatment are completed underground, and the mechanical filtration and the deep treatment are completed underground or above the surface; the produced water treated by treatment mode 2 meets the reuse requirements of "Water Quality for Landscape Environment Use of Urban Wastewater Recycling" (GB / T 18921) or "Water Quality for Urban Miscellaneous Use of Urban Wastewater Recycling" (GB / T 18920) or "Surface Water Quality Standard" (GB 3838);

[0012] Treatment mode three, the mine water in the underground water tank is subjected to pretreatment, enhanced pretreatment, mechanical filtration, deep treatment, concentrated brine treatment and zero emission treatment in sequence along the water treatment flow direction, wherein the pretreatment and enhanced pretreatment are completed underground, the mechanical filtration and the deep treatment are completed underground, or are completed above ground, and the concentrated brine treatment and the zero emission treatment are completed above ground; the produced water after treatment in the treatment mode three meets the reuse requirements of "Water Quality for Landscape Environment Water Use in Urban Wastewater Recycling" (GB / T 18921) or "Water Quality for Urban Miscellaneous Water Use in Urban Wastewater Recycling" (GB / T 18920) or "Surface Water Quality Standard" (GB 3838), so that the pure salt produced by nanofiltration (NF) salt separation and evaporation crystallization meets the requirements for industrial salt, and the mixed salt or mixed salt meets the requirements of "Pollution Control Standard for General Industrial Solid Waste Storage and Disposal Sites" (GB 18599) or "Hazardous Waste Landfill Control Standard" (GB 18598).

[0013] As the preferred technical solution:

[0014] Optionally, the pretreatment includes grid treatment, or grid treatment and cyclone sand settling treatment, the grid treatment includes two or three of a coarse grid treatment device, a medium grid treatment device and (or) a fine grid treatment device sequentially along the mine water treatment flow direction, the grid gap in the coarse grid treatment device is 16~25 mm, the grid gap in the medium grid treatment device is 10~16 mm, and the grid gap in the fine grid treatment device is 1.5~10 mm; the cyclone sand settling treatment includes a cyclone separator and a sand-water separator, and the coarse sand and part of the fine sand in the mine water are separated by the cyclone separator through the cyclone centrifugal force, and then precipitated and removed by the sand-water separator.

[0015] Optionally, the enhanced pretreatment is carried out using an ultra-efficient magnetic disk separator, which includes a coagulation and stirring device, a flocculation and stirring device, a magnetic disk separator and a magnetic recovery device which are sequentially connected along the mine water treatment flow direction, the coagulation and stirring device includes a non-powered pipeline mixer, a baffle mixing zone and a coagulation and stirring tank which are sequentially connected, the flocculation and stirring device includes a flocculation and stirring tank, the magnetic recovery device includes a high-speed deflocculant and a magnetic recovery machine, the mud outlet of the magnetic disk separator is connected to the inlet of the high-speed deflocculant; the high-speed deflocculant delivers the deflocculant magnetic powder and sludge to the magnetic recovery machine; the magnetic recovery machine delivers the recovered magnetic powder to the coagulation and stirring device of the ultra-efficient magnetic disk separator, and delivers the separated sludge to the sludge treatment device.

[0016] Optionally, the super-efficient magnetic disk separator also includes an automatic reagent dosing device, which includes a controller installed on a control cabinet; an inlet flow meter, which is connected to the controller for real-time monitoring of the flow value of the pre-treated mine water inlet, and feeding back to the controller; an inlet flow meter and an inlet water quality monitor, which are connected to the controller for real-time monitoring of the flow value, SS value and COD value of the pre-treated mine water inlet, and feeding back to the controller; an outlet water quality monitor, which is connected to the controller for real-time monitoring of the outlet water of the magnetic disk separator. The SS value and COD value are obtained and fed back to the controller; an image acquisition instrument is communicatively connected to the controller for real-time acquisition of the alum flower image of the flocculation stirring tank and the image result is fed back to the controller; and a reagent dosing pump is communicatively connected to the controller for regulating the dosage of the reagent according to the fed-back SS value, COD value and alum flower image result, one end of the reagent dosing pump is connected to the reagent storage tank, and the other end is connected to the coagulation stirring device, the flocculation stirring device, the magnetic disk separator and the magnetic recovery device, including a coagulant dosing pump, a magnetic powder dosing pump and a coagulant aid dosing pump.

[0017] Optionally, the mechanical filtration device is a quartz sand filter, an activated carbon filter or a fiber filter, including primary mechanical filtration or secondary or higher mechanical filtration.

[0018] Optionally, the deep treatment includes a membrane treatment device and a disinfection treatment device, the membrane treatment device includes a UF or MF device and a RO device, and is divided into a primary membrane treatment device, a two-stage membrane treatment device or a three-stage membrane treatment device, the primary membrane treatment device includes a primary UF or a primary MF + a primary RO, the two-stage membrane treatment device includes a two-stage UF or a two-stage MF + a two-stage RO, and the three-stage membrane treatment device includes a three-stage UF or a three-stage MF + a three-stage RO.

[0019] Optionally, the filtration membrane in the UF or MF device is an inorganic ceramic membrane or an organic material membrane; the RO membrane in the RO device is one or more of a brackish water RO membrane, a seawater RO membrane or a high-pressure RO membrane.

[0020] Optionally, the deep treatment further comprises a rapid hardness remover, which is arranged behind the primary membrane treatment device and comprises a hardness removal unit, a magnetic coagulation unit, a magnetic precipitation unit and a magnetic recovery unit;

[0021] The hardness removal unit comprises a non-powered pipeline mixer, a first baffle mixing zone and a first-level stirring hardness removal tank which are connected in sequence, and a power stirrer is installed in the first-level stirring hardness removal tank;

[0022] The magnetic coagulation unit comprises a second baffle mixing zone, a secondary stirring coagulation tank and a tertiary stirring flocculation tank which are connected in sequence, and a power agitator is installed in the secondary stirring coagulation tank and the tertiary stirring flocculation tank;

[0023] The magnetic precipitation unit comprises an inclined tube sedimentation tank;

[0024] The magnetic recovery unit includes a high-speed deflocculant and a magnetic recovery machine; the mud outlet of the inclined tube sedimentation tank is connected to the inlet of the high-speed deflocculant, the high-speed deflocculant transports the deflocculant magnetic mud to the magnetic recovery machine, the magnetic recovery machine separates the magnetic powder and the sludge, sends the magnetic powder to the magnetic powder storage tank, and sends the separated sludge to the sludge treatment unit.

[0025] Optionally, the rapid hardness remover also includes an automatic agent dosing device, which includes a controller installed on a control cabinet; an inlet flow meter, which is connected to the controller for real-time monitoring of the flow value of the mine water inlet treated by the primary membrane treatment device, and feeding back to the controller; an inlet water quality monitor, which is connected to the controller for monitoring the calcium and magnesium ion content and pH value in the mine water inlet treated by the primary membrane treatment device, and feeding back to the controller; an outlet water quality monitor, which is connected to the controller for monitoring the calcium and magnesium ion content and pH value in the outlet water. pH value, and feed it back to the controller; an image acquisition instrument, which is communicatively connected to the controller, used to collect alum flowers images of magnetic floc precipitation, and feed back the image results to the controller; and a reagent dosing pump, which is communicatively connected to the controller, used to adjust the dosage of the reagent according to the fed-back calcium and magnesium ion content values, pH value and alum flowers image results, one end of the reagent dosing pump is connected to the reagent storage tank, and the other end is respectively connected to the hardness removal unit and the magnetic coagulation unit, including a caustic soda dosing pump, a soda ash dosing pump, an oxalic acid dosing pump, a coagulant dosing pump, a magnetic powder dosing pump and a coagulant aid dosing pump.

[0026] Optionally, the concentrated brine treatment includes a NF salt separation device and an evaporation crystallization device, and the evaporation crystallization device adopts a mechanical vapor recompression (MVR) evaporator or a multiple effect evaporation (MED) evaporator.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention adopts three treatment modes, and different treatment modes are suitable for the treatment of mine water in different regions, with a wider application range. The water quality of produced water after treatment by different treatment modes meets the requirements of the specifications or standards for differentiated reuse, meeting the needs of mine water reuse in different regions.

[0029] The present invention adopts a super-efficient magnetic disk separator in the enhanced pretreatment stage, and adopts an intelligent dosing device, that is, by setting a controller, and setting an inlet flow meter, an inlet water quality monitor, an outlet water quality monitor, an image acquisition instrument and a reagent dosing pump that are communicatively connected to the controller; the controller accurately controls the dosage of the reagent dosing pump according to the SS value and COD value measured by the inlet water quality monitor, the SS value and COD value measured by the outlet water quality monitor, and the alum flower image of the flocculation tank measured by the image acquisition instrument, thereby realizing unmanned duty, reducing manual labor intensity, saving more than 20% of reagent consumption, reducing SS by more than 95%, and having the characteristics of fast purification speed, small footprint, short construction period, low operating cost and convenient daily maintenance under complex operating conditions in mines.

[0030] The present invention further removes hardness from the mine water after the primary membrane treatment underground or above the well, and effectively solves the problems of high hardness of mine water and low hardness removal efficiency of traditional technology by adopting a rapid hardness remover, and adopts an intelligent dosing device, that is, by setting a controller, and setting an inlet flow meter, an inlet water quality monitor, an outlet water quality monitor, an image acquisition instrument and a reagent dosing pump that are communicatively connected to the controller; the controller accurately controls the dosage of each reagent dosing pump required in the magnetic coagulation process according to the calcium and magnesium ion content and pH value measured by the inlet water quality monitor, the calcium and magnesium ion content and pH value measured by the outlet water quality monitor, and the alum flower image of the magnetic sedimentation tank measured by the image acquisition instrument, thereby realizing unmanned operation; compared with the prior art, the total hydraulic retention time (HRT) is shortened by more than 25%, achieving the effect of rapid hardness removal, and the rapid hardness remover saves more than 20% of the floor space.

[0031] The present invention overcomes the problem of low flux of traditional UF membrane modules (single effective membrane area 50 m 2 , water production 2.5~5 m 3 / h / branch), large area and easy scaling when treating high-turbidity and high-salt mine water, and cannot meet the needs of high-turbidity, high-salt and large-volume water treatment. The present invention adopts UF or MF and RO devices, that is, one-stage UF or one-stage MF + one-stage RO, two-stage UF or two-stage MF + two-stage RO, or three-stage UF or three-stage MF + three-stage RO. The device has a larger water output, higher integration, and smaller space. The advantages are particularly prominent for land-constrained and large-scale underground mine water treatment projects; the average flux of the UF unit for treating mine water is greater than 60 LMH, the turbidity of the produced water is less than 1 NTU, and it operates stably under the condition of TDS>40000 mg / L, which can be applied to treatment in or on mines, and the treated water can be reused for high-pressure spray water, underground dust prevention, fire water, and water for flushing tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 is a flow chart of the method of the present invention;

[0034] Figure 2 System flow chart of the super-efficient disk separator used in the method of the present invention

[0035] Figure 3 A system flow chart of a fast hardness removal machine used in the method of the present invention;

[0036] Figure 4 A system flow chart of the evaporation crystallization device used in the method of the present invention;

[0037] Figure 5 It is a system flow chart of processing mode 3 in the method of the present invention;

[0038] Reference numerals:

[0039] 1-Super efficient magnetic disk separator; 2-Lifting pump; 3-Ground water tank; 4-Mechanical filtration device; 5-Primary membrane treatment device; 6-Secondary membrane treatment device; 7-Quick hardness remover; 8-Disinfection treatment device; 9-NF salt separation device; 10-Evaporation crystallization device. DETAILED DESCRIPTION

[0040] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0041] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0042] The embodiment of the present invention provides a method for resource utilization and zero-emission treatment of high-turbidity and high-salt mine water. Figure 1 As shown, including:

[0043] S1, collects high-turbidity and high-salinity mine water into the underground water tank;

[0044] S2, according to the needs of different mining areas for the utilization of mine water resources, different processing modes are selected for quality-based processing, and the processing modes include:

[0045] Treatment mode 1: pre-treating, strengthening pre-treating and mechanically filtering the mine water in the underground water tank in sequence along the water treatment flow direction, wherein the pre-treatment and the strengthening pre-treatment are completed underground, and the mechanical filtration is completed underground or above ground; the produced water treated by the treatment mode 1 meets the reuse requirements of the underground fire protection and sprinkler design specifications and the coal washing engineering design specifications of the coal mine;

[0046] Among them, the pretreatment includes grid treatment, and the grid treatment includes a coarse grid treatment device, a medium grid treatment device and a fine grid treatment device in sequence along the mine water treatment flow direction. The gap of the grid in the coarse grid treatment device is 16~25mm, the gap of the grid in the medium grid treatment device is 10~16mm, and the gap of the grid in the fine grid treatment device is 1.5~10mm;

[0047] Or the pretreatment includes grid treatment and cyclone sand settling treatment, the cyclone sand settling treatment includes a cyclone separator and a sand-water separator, the coarse sand and part of the fine sand in the mine water are separated by the cyclone separator through the cyclone centrifugal force, and then precipitated and removed by the sand-water separator.

[0048] The enhanced pretreatment is carried out using an ultra-efficient disk separator, such as Figure 2 As shown, it includes a coagulation and stirring device, a flocculation and stirring device, a magnetic disk separator and a magnetic recovery device which are sequentially connected along the mine water treatment flow direction. The coagulation and stirring device includes a non-powered pipeline mixer, a baffle mixing zone and a coagulation and stirring tank which are sequentially connected. The flocculation and stirring device includes a flocculation and stirring tank. The magnetic recovery device includes a high-speed deflocculator and a magnetic recovery machine. The mud outlet of the magnetic disk separator is connected to the inlet of the high-speed deflocculator. The high-speed deflocculator delivers the deflocculated magnetic powder and sludge to the magnetic recovery machine. The magnetic recovery machine delivers the recovered magnetic powder to the coagulation and stirring device of the super-efficiency magnetic disk separator, delivers the separated sludge to the sludge treatment device, and the filtrate filtered out of the sludge treatment device flows back to the coagulation and stirring device. The super-efficient magnetic disk separator also includes an automatic reagent dosing device, including a controller installed on the control cabinet; an inlet flow meter, which is connected to the controller for real-time monitoring of the flow value of the pre-treated mine water inlet and feeding it back to the controller; an inlet water quality monitor, which is connected to the controller for real-time monitoring of the SS value and COD value of the pre-treated mine water inlet and feeding it back to the controller; an outlet water quality monitor, which is connected to the controller for real-time monitoring of the SS value and COD value of the magnetic disk separator outlet and feeding it back to the controller; an image acquisition instrument, which is connected to the controller for real-time acquisition of the alum flower image of the flocculation stirring tank and feeding the image result back to the controller; and a reagent dosing pump, which is connected to the controller for real-time acquisition of the alum flower image of the flocculation stirring tank and feeding back the image result to the controller; and a reagent dosing pump, which is connected to the controller for adjusting the dosage of the reagent according to the fed-back SS value, COD value and alum flower image result, one end of the reagent dosing pump is connected to the reagent storage tank, and the other end is connected to the coagulation stirring device, the flocculation stirring device, the magnetic disk separator and the magnetic recovery device, including a coagulant dosing pump, a magnetic powder dosing pump and a coagulant aid dosing pump.

[0049] The mechanical filtration device is a quartz sand filter, an activated carbon filter or a fiber filter, including a primary mechanical filtration or a secondary and above mechanical filtration, specifically a primary quartz sand filter, or a primary activated carbon filter, or a primary fiber filter, or a secondary quartz sand filter, or a quartz sand filter + activated carbon filter connected in series, or a quartz sand filter + fiber filter connected in series, or a three-stage activated carbon filter, etc. The specific selection method is selected according to the actual situation of mine water quality in different regions.

[0050] Treatment mode 2: The mine water in the underground water tank is subjected to pretreatment, enhanced pretreatment, mechanical filtration and deep treatment in sequence along the water treatment flow direction, wherein the pretreatment and enhanced pretreatment are completed underground, the mechanical filtration and deep treatment are completed underground, or the mechanical filtration and deep treatment are completed above the well, or the mechanical filtration is done underground and the deep treatment is done above the well, and the treatment is flexibly changed according to the actual situation; the produced water treated by treatment mode 2 meets the reuse requirements of the urban sewage recycling landscape water quality specification or the urban miscellaneous water quality specification or the surface water environmental quality standard;

[0051] Among them, the methods of pretreatment, enhanced pretreatment and mechanical filtration are the same as treatment mode one.

[0052] Deep treatment, including membrane treatment device and disinfection treatment device, the membrane treatment device includes UF or MF device and RO device, which is divided into one-stage membrane treatment device, two-stage membrane treatment device or three-stage membrane treatment device, the one-stage membrane treatment device includes one-stage UF or one-stage MF + one-stage RO, specifically: one-stage UF + one-stage RO, or one-stage MF + one-stage RO; the two-stage membrane treatment device includes two-stage UF or two-stage MF + two-stage RO, specifically: two-stage UF + two-stage RO, or two-stage MF + two-stage RO; the three-stage membrane treatment device includes three-stage UF or three-stage MF + three-stage RO, specifically: three-stage UF + three-stage RO, or three-stage MF + three-stage RO; the filtration membrane in the UF or MF device adopts inorganic ceramic membrane or organic material membrane; the RO membrane in the RO device adopts one or more of brackish water RO membrane, seawater RO membrane or high-pressure RO membrane;

[0053] The deep treatment also includes a fast hardness remover, which is set behind the first-level membrane treatment device, such as Figure 3As shown, it includes a hardness removal unit, a magnetic coagulation unit, a magnetic precipitation unit and a magnetic recovery unit; the hardness removal unit includes an inlet pipe, a non-powered pipe mixer, a first baffle mixing zone and a first-stage stirring hardness removal tank which are connected in sequence, and a power agitator is installed in the first-stage stirring hardness removal tank; the magnetic coagulation unit includes a second baffle mixing zone, a second-stage stirring coagulation tank and a third-stage stirring flocculation tank which are connected in sequence, and a power agitator is installed in the second-stage stirring coagulation tank and the third-stage stirring flocculation tank; the magnetic precipitation unit includes an inclined tube sedimentation tank; the magnetic recovery unit includes a high-speed deflocculating machine and a magnetic recovery machine; the mud outlet of the inclined tube sedimentation tank is connected to the inlet of the high-speed deflocculating machine, the high-speed deflocculating machine transports the deflocculated magnetic mud to the magnetic recovery machine, the magnetic recovery machine separates the magnetic powder from the sludge, sends the magnetic powder to the magnetic powder storage tank, and sends the separated sludge to the sludge treatment unit, and the filtrate filtered out of the sludge treatment unit flows back to the second-stage coagulation and stirring tank. The rapid hardness remover also includes an automatic agent dosing device, which includes a controller installed on the control cabinet; an inlet flow meter, which is connected to the controller for real-time monitoring of the flow value of the mine water inlet treated by the primary membrane treatment device, and feeding back to the controller; an inlet water quality monitor, which is connected to the controller for monitoring the calcium and magnesium ion content and pH value of the mine water inlet treated by the primary membrane treatment device, and feeding back to the controller; an outlet water quality monitor, which is connected to the controller for monitoring the calcium and magnesium ion content and pH value of the outlet water, and feeding back to the controller; an image acquisition instrument, which is connected to the controller for real-time monitoring of the flow value of the mine water inlet treated by the primary membrane treatment device, and feeding back to the controller; The controller is communicated and connected, and is used to collect the alum floc image of the magnetic floc precipitation and feed back the image result to the controller; and the agent dosing pump is communicated and connected with the controller, and is used to adjust the dosage of the agent according to the feedback calcium and magnesium ion content value, pH value and alum floc image result. The pH adjustment unit is used to adjust the pH of the produced water and is communicated and connected with the controller. One end of the agent dosing pump is connected to the agent storage tank, and the other end is respectively connected to the hardness removal unit and the magnetic coagulation unit, including a caustic soda dosing pump, a soda ash dosing pump, an oxalic acid dosing pump, a coagulant dosing pump, a magnetic powder dosing pump and a coagulant aid dosing pump.

[0054] Treatment mode three, the mine water in the underground water tank is subjected to pretreatment, enhanced pretreatment, mechanical filtration, deep treatment, concentrated brine treatment and zero emission treatment in sequence along the water treatment flow direction, wherein the pretreatment and enhanced pretreatment are completed underground, the mechanical filtration and deep treatment are completed underground, or completed above ground, and the concentrated brine treatment and zero emission treatment are completed above ground; the produced water after treatment in treatment mode three meets the reuse requirements of the urban sewage recycling landscape water quality specifications or urban miscellaneous water quality specifications or surface water environmental quality standards, the pure salt produced by NF salt separation and evaporation crystallization meets the requirements for industrial salt, and the mixed salt or mixed salt meets the requirements of general industrial solid waste storage, pollution control standards for disposal sites or hazardous waste landfill control standards.

[0055] Among them, the methods of pretreatment, enhanced pretreatment, mechanical filtration and deep treatment are the same as those of treatment mode 2. The concentrated brine treatment includes NF salt separation device and evaporation crystallization device. The evaporation crystallization device adopts MVR evaporator or MED evaporator. NF salt separation can further concentrate ions other than monovalent ions, such as SO4 2- After that, the freezing crystallization method can be used to purify Na2SO4. The concentrated brine treatment adopts the heat method + freezing method zero emission process, such as Figure 4 As shown, the concentrated water stock solution first enters the decarbonization tank for decarbonization to remove carbonate and bicarbonate in the raw water, and then is pumped into the sodium sulfate evaporation crystallization system to prepare sodium sulfate crystal salt, and the product sodium sulfate is obtained by a sodium sulfate dryer, or a centrifugal mother liquor is obtained by a centrifuge, and enters the freezing crystallization system to precipitate sodium sulfate, and the sodium sulfate enters the dissolution tank, and the dissolved saturated sodium sulfate solution is pumped into the sodium sulfate evaporation crystallization system to further recover sodium sulfate, or the separated centrifugal mother liquor is frozen and enters the impure salt evaporation crystallization system for evaporation and crystallization to precipitate impure salt, and part of the high-boiling point impure salt centrifugal mother liquor is discharged to the impure salt mother liquor dryer for treatment to obtain impure salt, and the condensed water obtained in the impure salt evaporation crystallization system and the impure salt mother liquor dryer is recovered.

[0056] The structures of each part in processing mode 3 of this embodiment are as follows Figure 5As shown, it includes a super-efficient magnetic disk separator arranged underground. After the mine water in the underground water tank is treated by the super-efficient magnetic disk separator 1, the produced water meets the water requirements of coal preparation, equipment cooling and roadway flushing. The produced water is further lifted by the lifting pump 2 to the ground water tank 3 for common use. If the produced water needs to be further treated, the produced water is further sent to the mechanical filtering device 4. The mechanical device 4 is composed of two quartz sand filters, activated carbon filters or fiber filters connected in series. The produced water meets the water requirements of coal preparation and equipment cooling after mechanical filtration. The produced water is further sent by the lifting pump 2 to the primary membrane treatment device 5, and is successively passed through the primary UF device and the primary RO The device is used for treatment. The produced water after the primary UF treatment meets the needs of fire fighting, dust reduction, ordinary spray water and irrigation water. The produced water after the primary UF device is transported to the primary RO device by the lifting pump 2. The concentrated brine concentrated by the RO membrane is further transported to the rapid hardness remover 7 for deep hardness removal. The concentrated brine is sent to the secondary membrane treatment device 6 again. The produced water treated by the primary RO device and the secondary RO device is used for landscape water, replenishment of surface water, miscellaneous water in mining areas, industrial boiler water and other industrial water. The produced water treated by the primary RO device and the secondary RO device is further treated by the disinfection treatment device 8, and the produced water meets the requirements of drinking water and high-pressure spray water. The concentrated brine treated by the secondary RO device is further treated by the NF salt separation device 9 and the evaporation crystallization device 10, so that the sodium sulfate or sodium chloride or sodium carbonate produced by NF salt separation and evaporation crystallization meets the requirements of industrial salt standards, and the generated miscellaneous salts or mixed salts meet the requirements of general industrial solid waste storage, pollution control standards for disposal sites or hazardous waste landfill control standards. The steam condensate generated during the evaporation crystallization process can be continuously reused in the device.

[0057] It has been verified that the method of the present invention is applied to the resource treatment of coal mine water in a certain area, and the project has been running continuously for 2 to 3 years with stable operation effect. The influent pollutant concentration is SS 2000~3000 mg / L, TDS 3000~4000 mg / L, sulfate 1800~2700 mg / L, chloride ion 500~600 mg / L; the produced water pollutant concentration is: SS <10 mg / L, TDS <1000 mg / L, sulfate <250 mg / L, chloride ion <250 mg / L.

[0058] The generated water can be used for dust reduction and fire fighting in the mine (meeting the "Design Specification for Fire Fighting and Sprinklers in Coal Mines" GB50383, turbidity ≤5 NTU, suspended matter particle size ≤0.3 mm); underground coal washing water and equipment cooling water (meeting the "Design Specification for Coal Washing Engineering" GB50359, SS ≤50 mg / L, total hardness ≤500 mg / L); landscape water above the mine (meeting the "Water Quality for Landscape Environment Water for Urban Wastewater Recycling" GB / T18921, turbidity ≤10 NTU, BOD5 ≤10 mg / L, total nitrogen ≤15 mg / L, total phosphorus ≤0.5 mg / L); miscellaneous water above the mine (meeting the "Water Quality for Urban Miscellaneous Water for Urban Wastewater Recycling" GB / T 18920, turbidity ≤10 NTU, BOD5 ≤10 mg / L, TDS ≤1000 mg / L); supplement surface water (meet the Shandong Province "Basin Water Pollutant Comprehensive Emission Standard Part 1: Nansihu Dongping Lake Basin" DB37 / 3416.1-2018, CODcr ≤ 20 mg / L, SS ≤ 20mg / L, TDS ≤ 1600 mg / L, SO4 2- ≤650 mg / L).

[0059] The salt produced with zero emission meets the requirements of "Industrial Anhydrous Sodium Sulfate" (GB / T6009, sodium sulfate, sodium sulfate content ≥99.0%, calcium and magnesium ≤0.15%, iron ≤0.002%, whiteness ≥82%, moisture ≤0.20%, chloride ≤0.35%, water-insoluble matter ≤0.05%); mixed salt and miscellaneous salt shall be transported and disposed of after identification in accordance with the "Pollution Control Standards for General Industrial Solid Waste Storage and Disposal Sites" GB18599.

Claims

1. A method for resource utilization and zero-emission treatment of high-turbidity and high-salt mine water, characterized in that: include: S1, collects high-turbidity and high-salinity mine water into the underground water tank; S2, according to the needs of different mining areas for the utilization of mine water resources, different processing modes are selected for quality-based processing, and the processing modes include: Treatment mode 1: pre-treating, enhancing pre-treatment and mechanical filtration are performed on the mine water in the underground water tank in sequence along the water treatment flow direction, wherein the pre-treatment and the enhanced pre-treatment are completed underground, and the mechanical filtration is completed underground or above the well; Treatment mode 2: pre-treatment, enhanced pre-treatment, mechanical filtration and deep treatment are performed on the mine water in the underground water tank in sequence along the water treatment flow direction, wherein the pre-treatment and enhanced pre-treatment are completed underground, and the mechanical filtration and deep treatment are completed underground or above ground; Treatment mode three: the mine water in the underground water tank is subjected to pretreatment, enhanced pretreatment, mechanical filtration, deep treatment, concentrated brine treatment and zero emission treatment in sequence along the water treatment flow direction, wherein the pretreatment and enhanced pretreatment are completed underground, the mechanical filtration and the deep treatment are completed underground or above ground, and the concentrated brine treatment and the zero emission treatment are completed above ground.

2. The method for quality resource utilization and zero-emission treatment of high-turbidity and high-salt mine water according to claim 1 is characterized by: The pretreatment includes grid treatment, or grid treatment and cyclone sand settling treatment; the grid treatment includes two or three of a coarse grid treatment device, a medium grid treatment device or a fine grid treatment device sequentially along the mine water treatment flow direction, the grid gap in the coarse grid treatment device is 16-25 mm, the grid gap in the medium grid treatment device is 10-16 mm, and the grid gap in the fine grid treatment device is 1.5-10 mm; the cyclone sand settling treatment includes a cyclone separator and a sand-water separator, and the coarse sand and part of the fine sand in the mine water are separated by the cyclone separator through the cyclone centrifugal force, and then precipitated and removed by the sand-water separator.

3. The method for quality resource utilization and zero-emission treatment of high-turbidity and high-salt mine water according to claim 1 is characterized by: The enhanced pretreatment is carried out by a super-efficient magnetic disk separator, which includes a coagulation and stirring device, a flocculation and stirring device, a magnetic disk separator and a magnetic recovery device which are sequentially connected along the mine water treatment flow direction; the coagulation and stirring device includes a non-powered pipeline mixer, a baffle mixing zone and a coagulation and stirring tank which are sequentially connected; the flocculation and stirring device includes a flocculation and stirring tank; the magnetic recovery device includes a high-speed deflocculator and a magnetic recovery machine; the mud outlet of the magnetic disk separator is connected to the inlet of the high-speed deflocculator; the high-speed deflocculator delivers the deflocculated magnetic powder and sludge to the magnetic recovery machine; the magnetic recovery machine delivers the recovered magnetic powder to the coagulation and stirring device of the super-efficient magnetic disk separator, and delivers the separated sludge to the sludge treatment device.

4. The method for quality resource utilization and zero-emission treatment of high-turbidity and high-salt mine water according to claim 3 is characterized by: The super-efficient magnetic disk separator also includes an automatic reagent dosing device, which includes a controller installed on a control cabinet; an inlet flow meter, which is connected to the controller in communication, and is used to monitor the flow value of the pre-treated mine water inlet in real time, and feed it back to the controller; an inlet flow meter and an inlet water quality monitor, which are connected to the controller in communication, and are used to monitor the flow value, SS value and COD value of the pre-treated mine water inlet in real time, and feed it back to the controller; an outlet water quality monitor, which is connected to the controller in communication, and is used to monitor the S value of the outlet water of the magnetic disk separator in real time. S value and COD value, and feed back to the controller; an image acquisition instrument, which is communicated with the controller and is used to collect the alum flower image of the flocculation stirring tank in real time, and feed back the image result to the controller; and a chemical dosing pump, which is communicated with the controller and is used to adjust the dosage of the chemical according to the fedback SS value, COD value and alum flower image result, one end of the chemical dosing pump is connected to the chemical storage tank, and the other end is connected to the coagulation stirring device, flocculation stirring device, magnetic disk separator and magnetic recovery device, including a coagulant dosing pump, a magnetic powder dosing pump and a coagulant aid dosing pump.

5. The method for quality resource utilization and zero-emission treatment of high-turbidity and high-salt mine water according to claim 1 is characterized by: The mechanical filtering device is a quartz sand filter, an activated carbon filter or a fiber filter, including a primary mechanical filtration or a secondary mechanical filtration or above.

6. The method for quality resource utilization and zero-emission treatment of high-turbidity and high-salt mine water according to claim 1 is characterized by: The deep treatment includes a membrane treatment device and a disinfection treatment device. The membrane treatment device includes a UF or MF device and a RO device, which is divided into a primary membrane treatment device, a two-stage membrane treatment device or a three-stage membrane treatment device. The primary membrane treatment device includes a primary UF or a primary MF+a primary RO, the two-stage membrane treatment device includes a two-stage UF or a two-stage MF+a two-stage RO, and the three-stage membrane treatment device includes a three-stage UF or a three-stage MF+a three-stage RO.

7. The method for quality resource utilization and zero-emission treatment of high-turbidity and high-salt mine water according to claim 6 is characterized by: The filtration membrane in the UF or MF device is an inorganic ceramic membrane or an organic material membrane; the RO membrane in the RO device is one or more of a brackish water RO membrane, a seawater RO membrane or a high-pressure RO membrane.

8. The method for quality resource utilization and zero-emission treatment of high-turbidity and high-salt mine water according to claim 6 is characterized by: The deep treatment also includes a rapid hardness removal machine, which is arranged behind the primary membrane treatment device and includes a hardness removal unit, a magnetic coagulation unit, a magnetic precipitation unit and a magnetic recovery unit; The hardness removal unit comprises a water inlet pipe, a non-powered pipe mixer, a first baffle mixing area and a first-level stirring hardness removal tank which are connected in sequence, and a power stirrer is installed in the first-level stirring hardness removal tank; The magnetic coagulation unit comprises a second baffle mixing zone, a secondary stirring coagulation tank and a tertiary stirring flocculation tank which are connected in sequence, and a power agitator is installed in the secondary stirring coagulation tank and the tertiary stirring flocculation tank; The magnetic precipitation unit comprises an inclined tube sedimentation tank; The magnetic recovery unit includes a high-speed deflocculant and a magnetic recovery machine; the mud outlet of the inclined tube sedimentation tank is connected to the inlet of the high-speed deflocculant, the high-speed deflocculant transports the deflocculant magnetic mud to the magnetic recovery machine, the magnetic recovery machine separates the magnetic powder and the sludge, sends the magnetic powder to the magnetic powder storage tank, and sends the separated sludge to the sludge treatment unit.

9. The method for quality resource utilization and zero-emission treatment of high-turbidity and high-salt mine water according to claim 8 is characterized by: The rapid hardness remover also includes an automatic agent dosing device, which includes a controller installed on a control cabinet; an inlet flow meter, which is connected to the controller in communication, and is used to monitor the flow value of the mine water inlet treated by the primary membrane treatment device in real time, and feed it back to the controller; an inlet water quality monitor, which is connected to the controller in communication, and is used to monitor the calcium and magnesium ion content and pH value in the mine water inlet treated by the primary membrane treatment device, and feed it back to the controller; an outlet water quality monitor, which is connected to the controller in communication, and is used to monitor the calcium and magnesium ion content and pH value of the outlet water. value, and feed it back to the controller; an image acquisition instrument, which is communicatively connected to the controller, used to collect alum floc images of magnetic floc precipitation, and feed back the image results to the controller; and a reagent dosing pump, which is communicatively connected to the controller, used to adjust the dosage of the reagent according to the fed-back calcium and magnesium ion content values, pH value and alum floc image results, one end of the reagent dosing pump is connected to the reagent storage tank, and the other end is respectively connected to the hardness removal unit and the magnetic coagulation unit, including a caustic soda dosing pump, a soda ash dosing pump, an oxalic acid dosing pump, a coagulant dosing pump, a magnetic powder dosing pump and a coagulant aid dosing pump.

10. The method for quality resource utilization and zero-emission treatment of high-turbidity and high-salt mine water according to claim 1 is characterized by: The concentrated brine treatment comprises a NF salt separation device and an evaporation crystallization device, and the evaporation crystallization device adopts an MVR evaporator or a MED evaporator.

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