CN215756759U

CN215756759U - Mine wastewater advanced recycling treatment system

Info

Publication number: CN215756759U
Application number: CN202120635455.6U
Authority: CN
Inventors: 苏战华
Original assignee: Letrade Shanghai Technology Co ltd
Current assignee: Letrade Shanghai Technology Co ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2022-02-08
Anticipated expiration: 2031-03-29

Abstract

The utility model provides a mine wastewater deep recycling treatment system, which comprises a primary membrane concentration unit, a secondary membrane concentration unit and a tertiary membrane concentration unit which are used for sequentially concentrating wastewater, wherein the primary membrane concentration unit and the secondary membrane concentration unit both adopt membrane elements with the desalination rate of at least 90 percent, the water inlet front end of the primary membrane concentration unit is communicated with an impurity filtering device, a wastewater softening and filtering device is arranged between the concentrated water end of the primary membrane concentration unit and the inlet of the secondary membrane concentration unit, the tertiary membrane concentration unit adopts a nanofiltration membrane for intercepting divalent ions, mine wastewater passes through the three-layer membrane concentration unit to ensure that the TDS concentration of the wastewater reaches a higher degree, heavy metal ions are filtered between the primary membrane concentration unit and the secondary membrane concentration unit, the required TDS concentration of recovered ions can be effectively ensured to reach the higher degree at the tertiary membrane concentration position, and the water quantity of a concentration section can be fully reduced, the crystallization amount and the crystallization cost of the crystallizer are reduced.

Description

Mine wastewater advanced recycling treatment system

Technical Field

The utility model relates to the technical field of water treatment equipment, in particular to a mine wastewater advanced recycling treatment system.

Background

After the mine wastewater is subjected to suspended matter removal, desalination and concentration, a part of wastewater with high salt content is generated. The zero discharge of the high-salinity wastewater is generally realized by evaporation crystallization treatment, the graded recovery and utilization of salt are realized, and the subsequent treatment of the generated miscellaneous salt is difficult. And the existing mature BWRO + SWRO process; and BWRO/SWRO + DTRO/STRO process; or NF + SWRO, and the concentrated water enters SWRO/DTRO; both STRO and DTRO membrane elements are subject to high replacement costs.

Patent document CN111792764B discloses a coal mine underground full-membrane modular mine wastewater treatment method and device, wherein wastewater is conveyed to an ultrafiltration membrane device through a water pump, and suspended matters, colloids and macromolecular organic impurities are intercepted by the ultrafiltration membrane; and then the wastewater is conveyed to a reverse osmosis separation device through a high-pressure water pump, and micromolecular organic matters and partial ions in the wastewater are taken away by concentrated water and discharged out of a membrane component so as to separate monovalent salt in the water discharged from the nanofiltration membrane device. But utilize the milipore filter device to filter, inevitable requirement to the milipore filter device is higher, increases and filters the cost, utilizes the milipore filter device only to separate out monovalent salt moreover, and inevitable results in the waste of bivalent usable salt, filters through two-layer membrane in addition, and inevitable can lead to the water yield increase of final dense water end, causes the increase of salt crystallization cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a mine wastewater deep recycling treatment system, which treats mine wastewater through an economical and efficient anti-scaling pretreatment technology and a multi-stage concentration technology, realizes the graded recycling and utilization of salt through the treatment of evaporative crystallization and freezing crystallization on the wastewater with high salt content generated after desalting concentration, and solves the problem of high replacement cost of an STRO or DTRO membrane element in the prior art.

In order to achieve the purpose, the utility model provides the following scheme: the utility model provides a mine waste water degree of depth retrieval and utilization processing system, includes that the concentrated unit of one-level membrane, the concentrated unit of second grade membrane and the concentrated unit of tertiary membrane that carry out concentrated processing to waste water in proper order, the concentrated unit of one-level membrane with the concentrated unit of second grade membrane all adopts the film element that the desalination is 90% at least, just the concentrated unit of one-level membrane's the front end intercommunication of intaking has impurity filtering device, the concentrated water end of one-level membrane concentrated unit with be equipped with waste water softening and filtering device between the import of the concentrated unit of second grade membrane, the concentrated unit of tertiary membrane adopts the nanofiltration membrane of holding back divalent ion, just the concentrated water end and the end of permeating water of the concentrated unit of tertiary membrane communicate with corresponding crystallizer respectively.

Preferably, the concentrated water ends of the first-stage membrane concentration unit and the second-stage membrane concentration unit are respectively provided with two outlets, one of the outlets is communicated with the inlet of the next-stage membrane concentration unit, and the other outlet is communicated with the inlet of the current-stage membrane concentration unit.

Preferably, the water permeable ends of the first-stage membrane concentration unit and the second-stage membrane concentration unit are communicated with a standard discharge area.

Preferably, the wastewater softening and filtering device comprises a hard softening tank and a multi-stage filtering unit for filtering softened water, wherein a first dosing device for putting softening agent and flocculating agent is arranged on the hard softening tank, and an inclined plate area convenient for flocculation sedimentation is arranged in the hard softening device.

Preferably, the multistage filtration unit comprises a filter tank and a first hollow fiber ultrafiltration device which are sequentially communicated, the filter tank is filled with a filler for intercepting suspended matters in softened water, and the first hollow fiber ultrafiltration device is internally provided with a cross flow filtration mechanism for intercepting micro particles in the softened water.

Preferably, the wastewater softening and filtering apparatus includes a resin softening apparatus filled with weak acid resin for removing residual hardness and metal ions.

Preferably, impurity filtering device is including the flocculation and precipitation pond that communicates in proper order and the flocculation and filtration device who is used for holding back the flocculation particle, be equipped with the second charge device that is used for putting in the flocculation and precipitation pond, just be equipped with the swash plate district that is used for the flocculating constituent to subside in the flocculation and precipitation pond.

Preferably, the flocculation filtration device comprises a self-cleaning filtration device and a second hollow fiber ultrafiltration device which are sequentially communicated, a filter screen for intercepting residual impurities in the wastewater is arranged in the self-cleaning filtration device, and a cross flow filtration mechanism for intercepting tiny particles in the softened water is arranged in the second hollow fiber ultrafiltration device.

Preferably, a clean water tank is communicated between the flocculation sedimentation tank and the self-cleaning filtering device.

Preferably, a high-pressure pump with the head meeting the transmembrane osmotic pressure of the wastewater is communicated between the second hollow fiber ultrafiltration device and the primary membrane concentration unit.

Compared with the prior art, the utility model has the following technical effects:

the first step of sequentially carrying out concentration treatment on the waste water comprises a first-stage membrane concentration unit, a second-stage membrane concentration unit and a third-stage membrane concentration unit, wherein the first-stage membrane concentration unit and the second-stage membrane concentration unit both adopt membrane elements with the desalination rate of at least 90 percent, the water inlet front end of the first-stage membrane concentration unit is communicated with an impurity filtering device, a waste water softening and filtering device is arranged between the concentrated water end of the first-stage membrane concentration unit and the inlet of the second-stage membrane concentration unit, the third-stage membrane concentration unit adopts a nanofiltration membrane for intercepting divalent ions, and the concentrated water end and the permeable water end of the third-stage membrane concentration unit are respectively communicated with corresponding crystallizers, namely, the mine waste water can effectively ensure that the waste water TDS concentration reaches a high degree through the three-stage membrane concentration unit, and heavy metal ions are filtered between the first-stage membrane concentration unit and the second-stage membrane concentration unit, so that the TDS concentration of ions required to be recovered can effectively ensured to reach a high degree at the third-stage membrane concentration position, and under the condition of ensuring high concentration, the water quantity of the concentration section can be fully reduced, and further the crystallization quantity and the crystallization cost of the crystallizer are reduced.

And a nanofiltration membrane for intercepting divalent ions is adopted in the second and third-stage membrane concentration units, and the concentrated water end and the permeable end of the third-stage membrane concentration unit are respectively communicated with corresponding crystallizers, so that monovalent ions and divalent ions are separated at the third-stage membrane concentration unit and are respectively recovered, and the recovery rate of salinity in the wastewater is improved.

And the concentrated water ends of the third and first-stage membrane concentration units and the second-stage membrane concentration unit are respectively provided with two outlets, one outlet is communicated with the inlet of the next-stage membrane concentration unit, and the other outlet is communicated with the inlet of the current-stage membrane concentration unit, so that the cross flow circulation of concentrated water is realized, the sufficient water inflow of the membrane shell is ensured, and the osmotic pressure of the membrane concentration unit is further ensured.

Fourth, be equipped with the swash plate district that the flocculation thing of being convenient for subsides in the demineralized softening device, and the multiple-stage filtration unit is including the filtering pond and the first hollow fiber ultrafiltration device that communicate in proper order, the filler that is used for holding back the suspended solid in the softened water is filled in the filtering pond, be equipped with the cross-flow filter equipment who holds back tiny granule in the softened water in the first hollow fiber ultrafiltration device, that is to say, impurity after the scale deposit is in proper order through flocculation treatment back, utilize the swash plate district to deposit the flocculation thing earlier, gradually carry out the filtration of large granule suspended solid and the filtration of tiny granule suspended solid again, fully guaranteed the effect of getting rid of to dirty impurity.

And fifthly, the wastewater softening and filtering device comprises a resin softening device, weak acid resin for removing residual hardness and metal ions is filled in the resin softening device, the weak acid resin has large adsorption capacity and is mainly used for removing the residual hardness and the metal ions, and the purity of ions at the position of the three-level membrane recovery unit is further ensured.

Sixthly, be equipped with the swash plate district that is used for the flocculating constituent to subside in the flocculation and precipitation pond, and flocculation filter equipment is including the self-cleaning filter equipment and the second hollow fiber ultrafiltration device that communicate in proper order, be equipped with the filter screen that is used for holding back remaining impurity in the waste water in the self-cleaning filter equipment, be equipped with the cross-flow filter equipment who holds back tiny granule in the demineralized water in the second hollow fiber ultrafiltration device, that is to say that initial impurity is in the mine waste water in proper order through flocculation treatment back, utilize the swash plate district to deposit the flocculation thing earlier, gradually carry out the filtration of large granule suspended solid and the filtration of small granule suspended solid again, fully guaranteed the effect of getting rid of initial impurity.

And a clean water tank is communicated between the flocculation sedimentation tank and the self-cleaning filtering device, and the water quality and the water quantity are averagely adjusted by utilizing the clean water tank.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic view of the integrated system wastewater treatment of the present invention;

the system comprises a first chemical feeding device, a second chemical feeding device, a 2-flocculation sedimentation tank, a 3-clean water tank, a 4-lift pump, a 5-self-cleaning filter, a 6-second hollow fiber ultrafiltration device, a 7-water production tank, an 8-high pressure pump, a 9-first-level membrane concentration unit, a 10-hardness removal softening tank, an 11-filter tank, a 12-first hollow fiber ultrafiltration device, a 13-resin softening device, a 14-second-level membrane concentration unit, a 15-third-level membrane concentration unit, a 16-freezing crystallizer and a 17-MVR evaporation crystallizer, wherein the chemical feeding device comprises a first chemical feeding device, a second chemical feeding device, a 2-flocculation sedimentation tank, a 3-clean water tank, a 4-lift pump, a 5-self-cleaning filter, a 6-second hollow fiber ultrafiltration device, a 7-water production tank, a 8-high pressure pump, a 9-first-level membrane concentration unit, a 10-hardness removal softening tank, a 11-filter tank, a 12-first hollow fiber ultrafiltration device, a 13-resin softening device, a 14-second-level membrane concentration unit, a 15-third-level membrane concentration unit, a 16-freezing crystallizer and a 17-MVR evaporation crystallizer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The utility model aims to provide a mine wastewater deep recycling treatment system, which treats the high-salt-content wastewater generated after mine wastewater is desalted and concentrated by an economical and efficient anti-scaling pretreatment technology and a multi-stage concentration technology, and finally realizes the graded recycling and utilization of salt by evaporation and crystallization treatment, thereby solving the problem of high replacement cost caused by adopting a STRO or DTRO membrane element in the prior art.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 1, the present embodiment provides a system for advanced recycling treatment of mine wastewater, which is mainly directed to mine wastewater containing SS, COD, part of metal and non-metal elements generated in a mining process, and the advanced recycling treatment can effectively avoid damage to resources such as agriculture, land, forest, and the like, and has triple benefits of environment, society and economy, and includes a primary membrane concentration unit 9, a secondary membrane concentration unit 14 and a tertiary membrane concentration unit 15, which sequentially perform concentration treatment on the wastewater, wherein the primary membrane concentration unit 9 and the secondary membrane concentration unit 14 both employ membrane elements having a desalination rate of at least 90%, the preferred primary membrane concentration unit 9 has characteristics of wide flow passage and loose pore diameter, the desalination rate is between nanofiltration and reverse osmosis, the operation pressure is low, and the water inlet front end of the primary membrane concentration unit 9 is communicated with an impurity filtering device, that is before the primary membrane concentration unit 9 is used to concentrate ions in the mine wastewater, suspended matters and particles in mine wastewater are firstly reduced, turbidity is reduced, system dirt is reduced, bacteria and algae are reduced, rust are generated, a wastewater softening and filtering device is arranged between a concentrated water end of a first-stage membrane concentration unit 9 and an inlet of a second-stage membrane concentration unit 14, the preferable wastewater softening and filtering device comprises a hardness removal softening pool 10 and a multi-stage filtering unit for filtering softened water, a nanofiltration membrane for intercepting divalent ions is adopted in a third-stage membrane concentration unit 15, the preferable nanofiltration membrane has higher interception rate on the divalent ions than the monovalent ions, the divalent ions and the monovalent ions in concentrated solution of the membrane concentration unit are separated, the divalent ions are mainly sodium sulfate, the monovalent ions are mainly sodium chloride, the separation aims are to ensure that salt obtained after crystallization is pure and has no impurities, and the concentrated water end and the permeable end of the third-stage membrane concentration unit 15 are respectively communicated with corresponding crystallizers. The mine wastewater in the utility model passes through the three-layer membrane concentration unit, suspended matters in the mine wastewater, calcium and magnesium hardness, soluble ions, COD and other pollution factors which are continuously enriched in the membrane concentration process are gradually removed, the TDS concentration of the wastewater can be effectively ensured to reach a high degree, and heavy metal ions are filtered between the primary membrane concentration unit 9 and the secondary membrane concentration unit 14, so that the TDS concentration of ions required to be recovered can be effectively ensured to reach a high degree at the tertiary membrane concentration part, the TDS is finally concentrated to 120000mg/l, DTRO and STRO membrane elements are not involved in the system, therefore, the operation cost is lower, the investment cost is relatively controlled, and under the condition of ensuring high concentration, the water quantity of a concentration section can be fully reduced, and further, the crystallization amount and the crystallization cost of a crystallizer are reduced.

As shown in fig. 1, in a preferred embodiment, the concentrated solution of the three-stage membrane concentration unit 15 mainly contains sodium sulfate, and the sodium sulfate is crystallized and precipitated by the freezing crystallizer 16 due to the drastic change of the solubility curve of sodium sulfate with temperature; the main component in the permeate of the third-stage membrane concentration unit 15 is sodium chloride, and the sodium chloride is crystallized and separated out through the MVR evaporation crystallizer 17 because the solubility of the sodium chloride is not obviously changed along with the temperature. Wherein ions in the tail end water are mainly SO combined with the concentration condition of the system process₄ ^2-、C l^-The main body is an NF salt separation system to realize the salt separation and purification of the wastewater, and a byproduct sodium sulfate can be obtained by combining the subsequent evaporation concentration or freezing crystallization process mainly according to the interception characteristic of a nanofiltration membrane element. The nanofiltration membrane element is used as a novel membrane separation technology in the field of material separation and high-pressure salt separation, the separation principle of the nanofiltration membrane element is similar to mechanical screening, but the nanofiltration membrane element body has charge, so the separation mechanism of the nanofiltration membrane element is only similar to mechanical screening, and meanwhile, the nanofiltration membrane element also has a dissolution and diffusion effect. This is an important reason why it has a high retention effect of macromolecules and divalent salts at very low pressures. The nanofiltration membrane element has poor interception effect on monovalent ions and organic matters with the molecular weight of less than 200 daltons, has higher interception rate on bivalent or multivalent ions and organic matters with the molecular weight of more than 500 daltons, and hardly intercepts organic matters with the molecular weight of less than 100 daltons and monovalent salt ions. The pore diameter of the nanofiltration membrane is generally between 1nm and 10 nm. Based on the southward pointing effect, selective interception is realized. The divalent and polyvalent anions are preferably intercepted, and the interception rate of the monovalent ions is related to the concentration and the composition of the feed liquid. The membrane cut-off calculated as neutral molecule was 150-300 daltons.

As shown in fig. 1, the concentrated water ends of the first-stage membrane concentration unit 9 and the second-stage membrane concentration unit 14 are both provided with two outlets, one of the outlets is communicated with the inlet of the next-stage membrane concentration unit 9, the other outlet is communicated with the inlet of the current-stage membrane concentration unit, the first-stage membrane concentration unit 9 and the second-stage membrane concentration unit 14 are both in a single-stage pass type, the concentrated water end of the first-stage membrane concentration unit 9 is provided with two outlets, one of the outlets is connected with the outlet of the high-pressure pump 8 and flows back to the outlet of the high-pressure pump 8 through the concentrated water, so that cross flow circulation of the concentrated water is realized, sufficient water inlet of a membrane shell is ensured, the other concentrated water is connected with the inlet of the hardness removal softening tank 10, the second-stage membrane concentration unit 14 is also in a single-stage pass type, the concentrated water end of the two circuits are provided, one of the outlets is connected with the inlet pipeline of the second-stage membrane concentration unit 14, and the other is connected with the inlet pipeline of the third-stage membrane concentration unit 15.

As shown in figure 1, the permeable ends of the first-stage membrane concentration unit 9 and the second-stage membrane concentration unit 14 are communicated with a standard discharge area, so that the preferable standard discharge of the mixed permeate of the second-stage membrane concentration unit 14 and the first-stage membrane concentration unit 9 is realized, the first-stage membrane concentration unit and the second-stage membrane concentration unit 14 adopt membrane elements with lower osmotic pressure, the water permeating the membranes reaches the standard and can be recycled as various process water, and the comprehensive utilization of mine wastewater is ensured.

As shown in fig. 1, the wastewater softening and filtering device includes a hardness-removing softening tank 10 and a multi-stage filtering unit for filtering softened water, wherein a first chemical adding device for adding a softening chemical and a flocculating chemical is arranged on the hardness-removing softening tank 10, and an inclined plate area for settling flocculates is arranged in the hardness-removing softening device; the optimized first dosing device is of an integrated structure and comprises five dosing areas of PAC, PAM, sodium hydroxide, sodium carbonate and sulfuric acid, wherein the sodium hydroxide and the sodium carbonate are dosed into a reaction area at the inlet of the hardness-removing softening tank 10 through a metering pump, concentrated water of the primary membrane concentration unit 9 is adjusted to be in an alkaline condition to facilitate chemical precipitation reaction, and the sodium carbonate and the permanent calcium and magnesium hardness in the concentrated water are subjected to chemical reaction to form precipitate; PAC and PAM are added in a flocculation area of the hardness-removing softening tank 10 through a metering pump, so that flocculation is accelerated, and small flocs are promoted to be rapidly aggregated into large flocs; sulfuric acid is added into a clarification zone of the hardness-removing softening tank 10 through a metering pump, and the PH is adjusted to be in a neutral condition.

The physicochemical treatment process for enhancing floc adsorption by adding various chemical agents improves the settling property of suspended matters in water, and simultaneously, calcium and magnesium ions and an additional agent are subjected to chemical reaction to form precipitates so as to achieve the purpose of hardness removal. When in operation, firstly, coagulant is added into the wastewater to destabilize suspended matters and colloidal particles in the wastewater, and then polymer coagulant aid is added to ensure that the destabilized impurity particles quickly generate alum flocs with higher density, thereby greatly shortening the settling time, improving the treatment capacity of the clarification tank and effectively coping with high impact load. The flocculated alum flocs slowly enter the settling zone, so that the alum flocs can be prevented from being damaged. The flocculated alum flocs are collected into sludge at the lower part of the sedimentation tank and concentrated. The inclined plate is arranged at the upper part of the sedimentation tank and is used for removing redundant alum blossom and ensuring the quality of the effluent. Part of the concentrated sludge is pumped to the inlet of the reaction tank by a sludge circulating pump in the concentration zone, and the other part of the residual sludge is pumped out by a sludge pump and sent to a sludge dewatering room for solidification treatment. Compared with the conventional sedimentation tank, the sedimentation tank has the following advantages: the mechanical coagulation and flocculation replace hydraulic coagulation and hydraulic flocculation, and the mechanical stirring enables the mixing of the medicament and the sewage to be quicker and more sufficient, so that the coagulation and flocculation effects are enhanced, and the medicament is saved. An upward flow inclined plate based on the shallow pool sedimentation theory is added in the sedimentation area, so that the floor area of the sedimentation area is greatly reduced. The application of the water inlet area and the expanded settling area can separate SS (approximately accounting for 80 percent of the total SS content) with large specific gravity and directly settle in the sludge recovery area, thereby reducing the sludge amount passing through the inclined plate and reducing the occurrence of inclined plate blockage.

As shown in figure 1, the multistage filtering unit comprises a filtering pool 11 and a first hollow fiber ultrafiltration device 12 which are sequentially communicated, wherein the filtering pool 11 is filled with a filler for intercepting suspended matters in softened water, a cross flow filtering mechanism for intercepting tiny particles in the softened water is arranged in the first hollow fiber ultrafiltration device 12, the preferred filtering pool 11 is of a V-shaped structure, the filtering pool 11 is filtered by a constant water level, water inlet grooves on two sides of the filtering pool are V-shaped, an ultrasonic water level automatic control device in the filtering pool can adjust a water outlet clean water valve, the valve can automatically adjust the opening degree according to the water level in the filtering pool to enable the water level in the filtering pool to be constant, the preferred filtering pool 11 uses a single-layer sand filtering material, the particle size is usually 0.95-1.35mm, the non-uniformity coefficient is 1.2-1.6, the thickness of the filtering material layer is 1.0-1.5m, the residual suspended matters in the hard softening pool 10 can be effectively intercepted and the turbidity of the outlet water can be reduced. After the filter 11 operates for a period of time, the back flushing operation is periodically carried out according to the quality of the effluent water and the filtering speed, and before the back flushing, the water level of the filter 11 is required to be lowered to the top of the drainage tank. Preferably, the outlet of the V-shaped filter 11 is connected with the inlet of the first hollow fiber ultrafiltration device 12 through a pipeline, the first hollow fiber ultrafiltration device 12 adopts a cross flow filtration mode, so that the recovery rate reaches over 90 percent, and the main function is to remove and separate particles with the effective diameter of 0.005-0.1um in the wastewater.

As shown in fig. 1, as a preferred embodiment, a water production tank 7 is provided between the first hollow fiber ultrafiltration device 12 and the primary membrane concentration unit 9, so that after the first hollow fiber ultrafiltration device 12 filters for a long time, the water production tank 7 is used to reversely flow the first hollow fiber ultrafiltration device 12, thereby removing impurities accumulated in the first hollow fiber ultrafiltration device 12, prolonging the service life of the first hollow fiber ultrafiltration device 12, and ensuring the filtration effect and the water yield.

As shown in fig. 1, the wastewater softening and filtering apparatus includes a resin softening apparatus 13, weak acid resin for removing residual hardness and metal ions is filled in the resin softening apparatus 13, the weak acid resin has a large adsorption capacity, and mainly removes the residual hardness and the metal ions, so as to further ensure the purity of ions at the tertiary membrane recovery unit, preferably, in order to ensure that softened water after primary filtration is directly filtered, an outlet of the first hollow fiber ultrafiltration apparatus 12 is connected to the resin softening apparatus 13, and an outlet of the resin softening apparatus 13 is connected to the secondary membrane concentration unit 14.

As shown in fig. 1, impurity filtering device is including the flocculation and precipitation pond 2 that communicates in proper order and the flocculation and precipitation device who is used for holding back the flocculation particle, be equipped with the second charge device 1 that is used for puting in the flocculation medicament on the flocculation and precipitation pond 2, preferred second charge device 1 is the integral structure, it includes PAC, PAM two kinds of medicaments, throw in the medicament to flocculation and precipitation pond 2, make colloid and dispersed particle such as suspended solid generate the floccule under the interact of molecular force, and be equipped with the swash plate district that is used for the floccule to subside in the flocculation and precipitation pond 2 to get rid of the floccule that produces in the flocculation and precipitation pond 2 tentatively.

As shown in fig. 1, the flocculation filtration device comprises a self-cleaning filtration device and a second hollow fiber ultrafiltration device 6 which are sequentially communicated, wherein a filter screen for intercepting residual impurities in the wastewater is arranged in the self-cleaning filtration device, and a cross-flow filtration mechanism for intercepting tiny particles in softened water is arranged in the second hollow fiber ultrafiltration device 6, namely, the self-cleaning filter 5 is a filter screen type and is used for removing suspended matters and particles in the precipitated mine wastewater, reducing turbidity and reducing system dirt, bacteria and algae and corrosion; the second hollow fiber ultrafiltration device 6 adopts a cross flow filtration mode, has a recovery rate of more than 90 percent, and has the main function of removing and separating particles with the effective diameter of 0.005-0.1um in the mine wastewater, thereby realizing gradual filtration and fully ensuring the removal effect of initial impurities.

As shown in fig. 1, a clean water tank 3 is communicated between the flocculation sedimentation tank 2 and the self-cleaning filtering device, the clean water tank 3 is used for averaging and adjusting the water quality and water quantity of the wastewater after the impurities are primarily removed, preferably, the outlet water of the clean water tank 3 is connected with the inlet of a lift pump 4 through a pipeline, and the outlet of the lift pump 4 is connected with a self-cleaning filter 5 at the inlet of a second hollow fiber ultrafiltration device 6 through a pipeline.

As shown in fig. 1, a high-pressure pump 8 with a head meeting transmembrane osmotic pressure of wastewater is communicated between the second hollow fiber ultrafiltration device 6 and the primary membrane concentration unit 9 to provide pressure for mine wastewater through the primary membrane concentration unit 9, an outlet of the preferable water production pond 7 is connected with an inlet of the high-pressure pump 8 through a pipeline, and an outlet of the high-pressure pump 8 is connected with an inlet of the primary membrane concentration unit 9 through a pipeline.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

The principle and the implementation mode of the utility model are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.

Claims

1. The utility model provides a mine waste water degree of depth retrieval and utilization processing system, its characterized in that, includes and carries out concentrated one-level membrane concentration unit, the concentrated unit of second grade membrane and the concentrated unit of tertiary membrane of processing to waste water in proper order, the concentrated unit of one-level membrane with the concentrated unit of second grade membrane all adopts the film element that the desalination is 90% at least, just the concentrated unit of one-level membrane's the front end intercommunication of intaking has impurity filter equipment, the concentrated water end of the concentrated unit of one-level membrane with be equipped with waste water softening and filter equipment between the import of the concentrated unit of second grade membrane, the concentrated unit of tertiary membrane adopts the nanofiltration membrane of holding back bivalent ion, just the concentrated water end and the end of permeating water of the concentrated unit of tertiary membrane communicate with corresponding crystallizer respectively.

2. The mine wastewater deep recycling treatment system according to claim 1, wherein the concentrated water ends of the first-stage membrane concentration unit and the second-stage membrane concentration unit are respectively provided with two outlets, one of the outlets is communicated with the inlet of the next-stage membrane concentration unit, and the other outlet is communicated with the inlet of the current-stage membrane concentration unit.

3. The mine wastewater advanced recycling treatment system according to claim 2, wherein the water permeable ends of the primary membrane concentration unit and the secondary membrane concentration unit are communicated with a standard discharge area.

4. The mine wastewater advanced recycling treatment system according to claim 1 or 3, wherein the wastewater softening and filtering device comprises a hardness-removing softening tank and a multi-stage filtering unit for filtering softened water, a first dosing device for dosing softening agent and flocculating agent is arranged on the hardness-removing softening tank, and an inclined plate area convenient for flocculation sedimentation is arranged in the hardness-removing softening device.

5. The mine wastewater advanced recycling treatment system according to claim 4, wherein the multistage filtration unit comprises a filter tank and a first hollow fiber ultrafiltration device which are sequentially communicated, the filter tank is filled with a filler for intercepting suspended matters in softened water, and the first hollow fiber ultrafiltration device is internally provided with a cross flow filtration mechanism for intercepting tiny particles in the softened water.

6. The mine wastewater advanced recycling treatment system according to claim 5, wherein the wastewater softening and filtering device comprises a resin softening device filled with weak acid resin for removing residual hardness and metal ions.

7. The mine wastewater advanced recycling treatment system according to claim 1 or 3, wherein the impurity filtering device comprises a flocculation sedimentation tank and a flocculation filtering device for intercepting flocculation particles, which are sequentially communicated, a second dosing device for dosing a flocculation reagent is arranged on the flocculation sedimentation tank, and an inclined plate area for flocculating constituent sedimentation is arranged in the flocculation sedimentation tank.

8. The system for advanced recycling treatment of mine wastewater according to claim 7, wherein the flocculation filtration device comprises a self-cleaning filtration device and a second hollow fiber ultrafiltration device which are sequentially communicated, a filter screen for intercepting residual impurities in the wastewater is arranged in the self-cleaning filtration device, and a cross flow filtration mechanism for intercepting tiny particles in softened water is arranged in the second hollow fiber ultrafiltration device.

9. The mine wastewater advanced recycling treatment system according to claim 8, characterized in that a clean water tank is communicated between the flocculation sedimentation tank and the self-cleaning filtering device.

10. The mine wastewater advanced recycling treatment system according to claim 9, wherein a high-pressure pump with a head meeting transmembrane osmotic pressure of wastewater is communicated between the second hollow fiber ultrafiltration device and the primary membrane concentration unit.