CN111547886A - Coal mine wastewater recycling comprehensive treatment system - Google Patents
Coal mine wastewater recycling comprehensive treatment system Download PDFInfo
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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Abstract
The invention discloses a coal mine wastewater recycling comprehensive treatment system, which simplifies a coal mine high-salinity wastewater treatment system, adopts the processes of pretreatment, multi-medium filtration and nanofiltration to obtain divalent calcium and magnesium ions in wastewater, and takes the obtained concentrated solution as a treating agent of coal washing wastewater, thereby reducing the treatment energy consumption of the high-salinity wastewater, simplifying the process, reducing the medicament cost in the coal washing wastewater treatment process, greatly improving the coal mine wastewater treatment efficiency and reducing the cost.
Description
Technical Field
The invention belongs to the field of mine wastewater treatment, and particularly relates to a coal mine wastewater recycling comprehensive treatment system.
Background
China is always a large country for coal production and consumption, coal resources are still main energy in China, a large amount of mine water is generated in the coal production process, about 80 hundred million tons of mine water are generated in the country every year, the annual loss amount of the mine water reaches 60 hundred million tons, and most of the mine water is treated in an outward discharge mode, so that not only is the waste of water resources, but also the ecological environment around a mining area is threatened. At present, mine water with high mineralization degree of a mine is mainly treated by reverse osmosis and evaporative crystallization, miscellaneous salt generated by the evaporative crystallization belongs to industrial hazardous waste, and if the mine water is transported to the ground for treatment, the treatment cost is high, and if the mine water is not properly treated, the mine water can harm the ecological environment on the earth surface of a mining area and the human health, and secondary pollution is easily caused.
The existing high-salinity mine water treatment technology has the defects of high treatment cost, generation of a large amount of industrial hazardous wastes and the like, so that how to properly solve the treatment problem of the high-salinity mine water and realize the recycling and harmless treatment technology of the high-salinity mine water is a thermal problem of current research in the field.
In the prior art, the treatment of the high-salinity mine wastewater is intensively carried out around the desalination idea, and the main methods of desalination are thermodynamic desalination, chemical desalination, electro-membrane method desalination, pressure-membrane method desalination, electro-adsorption method desalination and other desalination methods respectively, but the mineralized water treatment method based on the idea has high energy consumption, complex process and low economic efficiency, and is difficult to be practically applied to actual production.
CN109231632A discloses a treatment method for recycling and resource utilization of highly mineralized mine water, which finally realizes zero discharge of wastewater through pretreatment, calcium carbonate recovery, concentration and evaporative crystallization. However, in the treatment process, chemicals are required to be added to soften the wastewater, and hard ions in the wastewater are removed to form useless precipitated substances, but in the actual coal mine production process, a large amount of chemicals such as calcium chloride and magnesium chloride are required to be used for treating the coal washing wastewater. CN209368040U adopts a high-density pond and a softener double hardness removal device for pretreatment to remove calcium, magnesium and active silicon, and also removes 'resources' which can be used for coal washing wastewater treatment in the treatment process, so that mine water resources are not utilized as much as possible.
The method is a complex system in the coal mine industry, wherein a large amount of wastewater with different properties is generated, one of the wastewater with high treatment difficulty and high cost is high-concentration coal washing wastewater, one of the conventional processes of the high-concentration coal washing wastewater is combined treatment of calcium chloride and PAM, but the calcium chloride in the method has extremely high cost and is difficult to be utilized on a large scale, but the high-mineralization wastewater contains a large amount of calcium and magnesium ions, and how to jointly utilize the calcium chloride and the magnesium ions to reduce the addition of external agents becomes the key for recycling the coal mine wastewater.
Disclosure of Invention
The invention aims to provide a coal mine wastewater recycling comprehensive treatment system.
The purpose of the invention is realized by adopting the following technical scheme:
the invention discloses a coal mine wastewater recycling comprehensive treatment system which is characterized by comprising a pretreatment tank 1, a multi-medium filtering device 2, a security filter 3, a nanofiltration device 4, a nanofiltration concentrated water collection tank 5, an iron powder adding device 6, a centrifugal separation device 7, a high-concentration coal washing wastewater adjusting tank 8, a flocculation tank 9 and a solid-liquid separation device 10; the pretreatment tank 1, the multi-medium filtering device 2, the security filter 3, the nanofiltration device 4, the nanofiltration concentrated water collection tank 5 and the centrifugal separation device 7 are sequentially connected, the iron powder adding device 6 is arranged on the nanofiltration concentrated water collection tank 5, a clear liquid outlet of the centrifugal separation device 7 is connected with a flocculation tank 9, the high-concentration coal washing wastewater adjusting tank 8 is connected with the flocculation tank 9, the flocculation tank 9 is connected with the solid-liquid separation device 10, and the solid-liquid separation device 10 performs solid-liquid separation to obtain clear liquid and residues;
coal mine hypersalinity wastewater enters a pretreatment tank 1, impurities, coal particles and sludge in the coal mine hypersalinity wastewater are removed, and then effluent sequentially enters a multi-medium filtering device 2 and a security filter 3;
the effluent of the security filter 3 enters a nanofiltration device 4 through a pipeline mixer to remove the chroma, divalent ions and peculiar smell in the water, the water produced by the nanofiltration device is discharged for reuse, strong brine enters a nanofiltration concentrated water collecting tank 5, and a pH regulator is added into the pipeline mixer;
under the action of stirring, adding iron powder into a nanofiltration concentrated water collecting tank 5 by an iron powder adding device 6, after the reaction is finished, conveying the mixture into a centrifugal separation device 7 for centrifugal separation to obtain concentrated solution and sediments, collecting the concentrated solution for utilization, and returning the sediments to the nanofiltration concentrated water collecting tank;
and adjusting the pH value of the concentrated solution to 4-5, adding the concentrated solution after the pH value is adjusted into a flocculation tank to be mixed with the high-concentration coal washing wastewater, adding a flocculating agent under the stirring condition, and then carrying out solid-liquid separation to obtain clear liquid and residues.
Further, the pH regulator is one or more of acid mine wastewater, hydrochloric acid and sulfuric acid;
further, a calcining furnace 11 is arranged, the residue obtained by solid-liquid separation is dehydrated, dried and calcined, and then the calcined residue is ball-milled to prepare the porous material with the particle size of 1-5 mm;
further, adding a porous material into the flocculation tank 9, wherein the adding amount of the porous material is 5-15 g/L;
further, the adding amount of the iron powder is 8-20 g/L;
further, after dehydrating and drying the residue, the residue is dehydrated and dried, and then the mixture is mixed according to the mass ratio of 10: adding caustic soda according to the proportion of 1, grinding to 0.05-0.2mm after calcining, adding a hydrochloric acid solution and/or acid mine wastewater into a calcined product, adjusting the pH to 3-5, stirring for 30-75min under a heating condition, cooling to room temperature after the reaction is finished, and removing waste residues to obtain a solution containing calcium magnesium polysilicate;
further, the flocculant is one or a combination of PAM and poly-ferric calcium magnesium silicate;
further, the sintering temperature in the calcining furnace is 1250-1800 ℃.
The coal washing wastewater treatment process disclosed by the invention at least has the following advantages:
1. the coal mine high-salinity wastewater treatment system is simplified, divalent calcium and magnesium ions in wastewater are obtained by adopting the processes of pretreatment, multi-medium filtration and nanofiltration, and the obtained concentrated solution is used as a treating agent of coal washing wastewater, so that the treatment energy consumption of the high-salinity wastewater is reduced, the process is simplified, the medicament cost in the coal washing wastewater treatment process is reduced, the coal mine wastewater treatment efficiency is greatly improved, and the cost is reduced;
2. the method comprises the following steps of (1) dehydrating and drying silicon dioxide in solid waste generated after coal washing wastewater treatment, adding caustic soda, adding hydrochloric acid solution and/or acid mine wastewater into a product obtained after calcination and grinding for activation treatment, and finally forming poly-ferric calcium magnesium silicate by adding calcium and magnesium ions in high-salinity wastewater concentrated solution and ferric ions released by added iron powder, wherein the waste is changed into a treating agent, so that the method not only can be used for coal mine wastewater, but also can be applied to similar process flows, and the product can be produced to improve the income;
4. after a large amount of calcium, magnesium and iron are added into the coal washing wastewater, calcium ions, iron ions and iron ions neutralize colloid with negative charges, and after the flocculating agent is added, the flocculating effect of the flocculating agent is obviously improved;
5. after the porous substance is added into the wastewater, the salt-based ions in the porous substance such as calcium, iron, magnesium and the like are released, meanwhile, the organic matters in the wastewater are greatly adsorbed due to the addition of the porous substance, and massive flocs can be quickly formed due to the cooperation of the porous substance and the flocculating agent, so that the sludge sedimentation speed is increased, and the quick separation of mud and water is realized.
Drawings
FIG. 1 is a schematic view of a coal mine wastewater recycling comprehensive treatment system.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
Coal mine hypersalinity wastewater quality: the salt content is 2500-;
the water quality of coal washing wastewater of a certain coal mine is as follows: pH value: 8.21, SS: 70.42g/L, COD: 18325 mg/L;
the invention discloses a coal mine wastewater recycling comprehensive treatment system which is characterized by comprising a pretreatment tank 1, a multi-medium filtering device 2, a security filter 3, a nanofiltration device 4, a nanofiltration concentrated water collection tank 5, an iron powder adding device 6, a centrifugal separation device 7, a high-concentration coal washing wastewater adjusting tank 8, a flocculation tank 9 and a solid-liquid separation device 10; the pretreatment tank 1, the multi-medium filtering device 2, the security filter 3, the nanofiltration device 4, the nanofiltration concentrated water collection tank 5 and the centrifugal separation device 7 are sequentially connected, the iron powder adding device 6 is arranged on the nanofiltration concentrated water collection tank 5, a clear liquid outlet of the centrifugal separation device 7 is connected with a flocculation tank 9, the high-concentration coal washing wastewater adjusting tank 8 is connected with the flocculation tank 9, the flocculation tank 9 is connected with the solid-liquid separation device 10, and the solid-liquid separation device 10 performs solid-liquid separation to obtain clear liquid and residues;
the system is carried out by the following steps:
(1) a pretreatment section: the coal mine hypersalinity wastewater firstly enters a pretreatment tank, impurities, coal particles and sludge in the coal mine hypersalinity wastewater are removed, and then effluent sequentially enters a multi-medium filtering device and a security filter;
(2) concentrated section of strong brine: in the step (1), the effluent of the safety filter enters a nanofiltration device through a pipeline mixer to remove chromaticity, divalent ions and peculiar smell in the water, the water produced by the nanofiltration device is discharged and recycled, strong brine enters a nanofiltration concentrated water collecting tank, and a pH regulator is added into the pipeline mixer to regulate the pH of the wastewater to 4-6;
(3) adding iron powder into a nanofiltration concentrated water collecting tank under the action of stirring, carrying out solid-liquid separation after the reaction is finished to obtain concentrated solution and sediments, collecting and utilizing the concentrated solution, returning the sediments to the nanofiltration concentrated water collecting tank, wherein the adding amount of the iron powder is 10g/L, and after the iron powder is added into the concentrated water, the elemental iron and heavy metal ions in the concentrated water are subjected to displacement reaction and ferrous ions are separated out under an acidic condition;
(4) adjusting the pH value of the concentrated solution to 3-4, adding the concentrated solution after the pH value is adjusted into high-concentration coal washing wastewater for mixing, and controlling the volume ratio of the concentrated solution to the high-concentration coal washing wastewater to be 1: 10;
(5) and (4) adding a flocculating agent into the waste water mixed in the step (4) under the stirring condition, and then carrying out solid-liquid separation to obtain clear liquid and residues.
Wherein the salt content of the concentrated brine entering the nanofiltration concentrated water collecting tank is 13235-. A calcium chloride comparison test is carried out on coal washing wastewater, the difference is only that nanofiltration concentrated water is adopted in the method, calcium chloride is adopted in the comparison example, and other process parameters are the same:
from the test results, the following conclusions can be drawn:
the nanofiltration concentrated water is used as a medicament for treating the coal washing wastewater, although the treatment effect is slightly inferior to that of a calcium chloride method, the treatment effect completely meets the design requirement, the medicament cost of the calcium chloride process can be greatly reduced, and the problems of process complexity, energy consumption and the like of the coal mine high-mineralization wastewater treatment process are also reduced.
Example 2
On the basis of the treatment of the step 1, dehydrating and drying the residue obtained by solid-liquid separation, calcining, and then ball-milling the calcined residue to prepare a porous material with the particle size of 1-5mm, wherein the porous material is added when the concentrated solution is mixed with the high-concentration coal washing wastewater in the step (4), and the adding amount of the porous material is 5g/L, 10g/L and 15 g/L; in comparison with example 1 without the addition of porous material:
from the test results, the following conclusions can be drawn:
after the obtained porous material is added, the SS removing effect and the COD removing effect are obviously improved, salt-based ions such as calcium, iron, magnesium and the like in the porous material are released in the flocculation precipitation process of the porous material, organic matters in the wastewater are greatly adsorbed due to the addition of the porous material, and massive flocs can be quickly formed due to the cooperation of the porous material and a flocculating agent, the sludge settling speed is improved, and the quick separation of mud and water is realized.
Example 3
On the basis of the treatment of the comparative document 1, after the residue is dehydrated and dried, the residue is dried and mixed according to the mass ratio of 10: 1, adding caustic soda according to the proportion of 1, grinding to 0.05-0.1mm after calcination, adding a hydrochloric acid solution and/or acid mine wastewater into a calcined product, adjusting the pH to 3-5, stirring for 30-75min under a heating condition, cooling to room temperature after the reaction is finished, removing waste residues to obtain a solution containing calcium magnesium polysilicate, wherein the calcination is carried out in a calcination furnace, and the sintering temperature in the calcination furnace is 1250 ℃;
the flocculant is prepared by mixing PAM and poly-ferric calcium magnesium silicate;
other process parameters are the same:
after the polysilicate calcium magnesium, the SS effect is continuously reduced along with the addition of the polysilicate calcium magnesium, which shows that the effect of removing the SS by PAM is better than the effect of removing the SS by matching the PAM with the polysilicate calcium magnesium, but the removal effect of COD is also found to be improved along with the polysilicate calcium magnesium, probably because polysilicic acid is better contacted with organic matters in wastewater, the removal effect of the COD is improved, but in general, the addition of the polysilicate calcium magnesium greatly reduces the dosage of PAM and reduces the treatment cost of the coal mine wastewater.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (8)
1. A coal mine wastewater recycling comprehensive treatment system is characterized by comprising a pretreatment tank (1), a multi-medium filtering device (2), a security filter (3), a nanofiltration device (4), a nanofiltration concentrated water collecting tank (5), an iron powder adding device (6), a centrifugal separation device (7), a high-concentration coal washing wastewater adjusting tank (8), a flocculation tank (9) and a solid-liquid separation device (10); the pretreatment tank (1), the multi-medium filtering device (2), the security filter (3), the nanofiltration device (4), the nanofiltration concentrated water collection tank (5) and the centrifugal separation device (7) are sequentially connected, the iron powder adding device (6) is arranged on the nanofiltration concentrated water collection tank (5), a clear liquid outlet of the centrifugal separation device (7) is connected with a flocculation tank (9), the high-concentration coal washing wastewater adjusting tank (8) is connected with the flocculation tank (9), the flocculation tank (9) is connected with the solid-liquid separation device (10), and the solid-liquid separation device (10) performs solid-liquid separation to obtain clear liquid and residues; coal mine hypersalinity wastewater enters a pretreatment tank (1), impurities, coal particles and sludge in the coal mine hypersalinity wastewater are removed, and then effluent sequentially enters a multi-medium filtering device (2) and a security filter (3); the outlet water of the cartridge filter (3) enters a nanofiltration device (4) through a pipeline mixer, strong brine enters a nanofiltration concentrated water collecting tank (5), and a pH regulator is added into the pipeline mixer; under the action of stirring, adding iron powder into a nanofiltration concentrated water collecting tank (5) by an iron powder adding device (6), after the reaction is finished, conveying the mixture into a centrifugal separation device (7) for centrifugal separation to obtain concentrated solution and sediments, collecting and utilizing the concentrated solution, and returning the sediments to the nanofiltration concentrated water collecting tank; and adjusting the pH value of the concentrated solution to 4-5, adding the concentrated solution after the pH value is adjusted into a flocculation tank to be mixed with the high-concentration coal washing wastewater, adding a flocculating agent under the stirring condition, and then carrying out solid-liquid separation to obtain clear liquid and residues.
2. The coal mine wastewater recycling comprehensive treatment system of claim 1, characterized in that: the pH regulator is one or more of acid mine wastewater, hydrochloric acid and sulfuric acid.
3. The coal mine wastewater recycling comprehensive treatment system of claim 1, characterized in that: and a calcining furnace (11) is also arranged, the residue obtained by solid-liquid separation is dehydrated, dried and calcined, and then the calcined residue is subjected to ball milling to prepare the porous material with the particle size of 1-5 mm.
4. The coal mine wastewater recycling comprehensive treatment system of claim 3, characterized in that: and adding a porous material into the flocculation tank (9), wherein the adding amount of the porous material is 5-15 g/L.
5. The coal mine wastewater recycling comprehensive treatment system of claim 1, characterized in that: the adding amount of the iron powder is 8-20 g/L.
6. The coal mine wastewater recycling comprehensive treatment system of claim 1, characterized in that: and after dehydrating and drying the residue, mixing the raw materials in a mass ratio of 10: adding caustic soda according to the proportion of 1, grinding to 0.05-0.2mm after calcining, adding hydrochloric acid solution and/or acid mine wastewater into the calcined product, adjusting the pH to 3-5, stirring for 30-75min under a heating condition, cooling to room temperature after the reaction is finished, and removing waste residues to obtain solution containing calcium magnesium polysilicate.
7. The coal mine wastewater recycling comprehensive treatment system of claim 1 or 6, characterized in that: the flocculating agent is one or a combination of PAM and calcium magnesium polysilicate.
8. The coal mine wastewater recycling comprehensive treatment system of claim 3, 4 or 6, characterized in that: the sintering temperature in the calcining furnace is 1250-1800 ℃.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113429011A (en) * | 2021-06-03 | 2021-09-24 | 河北钢铁集团沙河中关铁矿有限公司 | Comprehensive treatment method for mine water of large water mine |
| CN114477632A (en) * | 2022-01-25 | 2022-05-13 | 安尔达技术(北京)有限责任公司 | Comprehensive utilization and treatment method for mine wastewater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113429011A (en) * | 2021-06-03 | 2021-09-24 | 河北钢铁集团沙河中关铁矿有限公司 | Comprehensive treatment method for mine water of large water mine |
| CN114477632A (en) * | 2022-01-25 | 2022-05-13 | 安尔达技术(北京)有限责任公司 | Comprehensive utilization and treatment method for mine wastewater |
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Application publication date: 20200818 |