CN110655290A - Coal mine wastewater treatment method - Google Patents
Coal mine wastewater treatment method Download PDFInfo
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- CN110655290A CN110655290A CN201911151609.8A CN201911151609A CN110655290A CN 110655290 A CN110655290 A CN 110655290A CN 201911151609 A CN201911151609 A CN 201911151609A CN 110655290 A CN110655290 A CN 110655290A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/26—Treatment of water, waste water, or sewage by extraction
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a coal mine wastewater treatment method, wherein an ultrasonic device is arranged in a sedimentation tank, ultrasonic treatment is carried out before a flocculating agent is added, water molecule groups wrapped outside particles with negative charges can be vibrated and broken, the contact chance of a cationic flocculating agent and the particles with negative charges is improved, and then the sedimentation effect is improved.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a coal mine wastewater treatment method.
Background
The characteristics of energy occurrence in China determine that coal is the main energy problem in China. China is lack of oil, less gas and rich in coal. And a large amount of coal washing water, coal slime water, mine sewage and other coal mine wastewater can be generated in the coal washing, coal dressing and coal digging processes. The coal mine wastewater has the characteristics of high content of suspended matters, difficult natural sedimentation and the like. If the coal mine wastewater is directly discharged, the coal mine wastewater not only pollutes water bodies and clogs riverways, but also can hinder the growth of aquatic organisms, so the coal mine wastewater becomes one of main pollution sources and coal loss sources of the coal industry.
The coal mine wastewater treatment cost is high in China, the recovery rate is low, and the waste of water resources is extremely remarkable. Because a large number of particles exist in the coal-containing wastewater, the particles are mainly aggregated by negative ion groups to form agglomerates, and meanwhile, water molecule groups can be formed on the outer surfaces of the negative ion groups, although part of the groups can be removed in the electric flocculation treatment process, the water molecule groups outside the groups have the isolation effect on the cationic flocculant, are difficult to contact with the negative ion groups, and have poor flocculation effect. For example, CN206720930U discloses a novel electric flocculation coal-containing wastewater treatment system, which has a working principle that direct current electrolysis is performed on a plurality of groups of parallel-connected polar plates to generate an electric field between the polar plates, so that water to be treated flows into gaps of the polar plates.
The coal mine wastewater is high in suspended matter content, the speed of the sludge-water separation process after flocculation treatment is low, the energy consumption is high, in order to improve the removal efficiency, the common practice in the field is magnetic coagulation treatment, for example, CN104163536A discloses a magnetic coagulation underground mine water purification process, and CN204162489U discloses a quick and efficient magnetic separation device.
Disclosure of Invention
The invention aims to provide a coal mine wastewater treatment method capable of improving the flocculation effect of coal mine wastewater.
The invention also aims to provide a coal mine wastewater treatment method for improving the magnetic treatment effect of the coal mine wastewater.
One of the purposes of the invention is realized by adopting the following technical scheme:
in order to solve the technical problem, the invention discloses a coal mine wastewater treatment method, which comprises the following steps:
1. introducing coal mine wastewater into a sedimentation tank for sedimentation pretreatment, arranging ultrasonic equipment in the sedimentation tank for carrying out ultrasonic treatment on the coal mine wastewater, and turning off an ultrasonic device after turning on for 3-10 min;
2. adding a flocculating agent into a sedimentation tank, starting a stirring device for stirring, wherein the stirring speed is adjusted based on the formed size of the flocs and is 80-600 r/min; the flocculant is ferric salt and/or aluminum salt flocculant;
3. adding a flocculating agent into the wastewater, uniformly mixing, starting the ultrasonic device again for 2-5min, stopping ultrasonic treatment, and then introducing the wastewater into an inclined plate sedimentation tank for sedimentation;
4. sludge dewatering treatment is carried out after the dregs in the inclined plate sedimentation tank are discharged, and the supernatant in the inclined plate sedimentation tank is introduced into a primary membrane treatment process;
5. introducing concentrated water of the primary membrane treatment process into a secondary membrane treatment process, and recycling clean water of the primary membrane treatment process for coal mine production;
6. extracting and recovering concentrated water in the secondary membrane treatment process, performing advanced oxidation treatment on the residual extraction raffinate, and introducing into a conventional biochemical treatment process;
7. and introducing clear water in the secondary membrane treatment process into the conventional biochemical treatment process for further treatment.
Further, the components of the flocculant are as follows: one or more of polyaluminum ferric chloride, polyaluminum chloride, polyferric chloride, aluminum sulfate, ferric chloride, ferrous chloride, ferric sulfate and ferrous sulfate;
further, ferromagnetic particles are added into the flocculating agent, and the ferromagnetic particles are ferric oxide particles;
further, the mass ratio of the iron salt and/or the aluminum salt to the ferromagnetic particles is 1: 0.2-3;
furthermore, a mud scraping device is arranged on an inclined plate in the inclined plate sedimentation tank and used for cleaning sediments on the inclined plate; the inclined plate is connected with an electromagnetic device and can provide a magnetic field;
further, the primary membrane separation processor is ultrafiltration or nanofiltration, and the secondary membrane separation processor 4 is ultrafiltration;
further, the resonance frequency of the ultrasonic device is controlled to be 500-5800 kHz;
further, the magnetic flocculant is prepared from the flocculant and ferromagnetic particles, and the preparation method of the magnetic flocculant comprises the following steps:
A) preparing a ferric waste acid stock solution, namely preparing a ferric waste acid solution with the mass percentage concentration of 18-20% by using waste acid and a ferric waste liquid;
B) preparing a ferromagnetic material: preparing iron oxide particles by one or more of a precipitation method, a colloid chemical method and a hydrothermal method;
C) preparing an aluminum-iron mixed solution, putting the iron-containing waste acid stock solution into a reaction container with a stirring device in batches, putting excessive aluminum slag, and reacting the aluminum slag and the iron-containing waste acid stock solution under the stirring state of the stirring device;
D) and respectively adding the ferric oxide particles and oxidant sodium chlorate into the aluminum-iron mixed solution, and continuously stirring for reacting for 2 hours to finally obtain the magnetic flocculant.
The mass ratio of aluminum to iron in the aluminum-iron mixed liquid is 5: 6-12;
further, the ultrasonic device is intermittently started, is stopped for 5-10min after being started for 5-10min, is then started again, and is then stopped again.
The coal mine wastewater treatment system and the coal mine wastewater treatment process have the following advantages:
1. an ultrasonic device is arranged in the sedimentation tank, ultrasonic treatment is carried out before the flocculating agent is added, water molecule groups wrapped outside the particles with negative charges can be broken through vibration, the contact chance of the cationic flocculating agent and the particles with negative charges is improved, and then the sedimentation effect is improved;
2. the magnetic particles are added in the adopted flocculating agent, and the magnetic particles and the flocs are fully mixed, so that the problem of uneven distribution of magnetic materials is avoided;
3. the ultrasonic device is intermittently started, water molecule groups wrapped on the surfaces of the particles are broken, the solubility of a flocculating agent released by the electric flocculation device is improved, and meanwhile, the intermittent ultrasonic treatment has certain influence on the formation of flocs, but after multiple intermittent ultrasonic treatments, the formed flocs have larger structures and are easier to settle;
4. by adopting two-stage membrane separation treatment, organic matters (mainly flotation agents) in the wastewater can be effectively recovered, extracted and concentrated, and the recovery of the flotation agent organic matters can reduce the cost in the flotation process.
Drawings
FIG. 1 is a schematic diagram of a coal mine wastewater treatment method.
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
As shown in fig. 1, a coal mine wastewater treatment method comprises the following steps:
1. introducing coal mine wastewater into a sedimentation tank for sedimentation pretreatment, arranging ultrasonic equipment in the sedimentation tank for carrying out ultrasonic treatment on the coal mine wastewater, and turning off an ultrasonic device after turning on for 3-10 min;
2. adding a flocculating agent into a sedimentation tank, starting a stirring device for stirring, wherein the stirring speed is adjusted based on the formed size of the flocs and is 80-600 r/min; the flocculant is ferric salt and/or aluminum salt flocculant;
3. adding a flocculating agent into the wastewater, uniformly mixing, then restarting the ultrasonic device for 2-5min, and introducing the wastewater into an inclined plate sedimentation tank for sedimentation;
4. sludge dewatering treatment is carried out after the dregs in the inclined plate sedimentation tank are discharged, and the supernatant in the inclined plate sedimentation tank is introduced into a primary membrane treatment process;
5. introducing concentrated water of the primary membrane treatment process into a secondary membrane treatment process, and recycling clean water of the primary membrane treatment process for coal mine production;
6. extracting and recovering concentrated water in the secondary membrane treatment process, performing advanced oxidation treatment on the residual extraction raffinate, and introducing into a conventional biochemical treatment process;
7. introducing clean water in the secondary membrane treatment process into the conventional biochemical treatment process for further treatment;
the mass ratio of ferric salt and/or aluminum salt to ferromagnetic particles of the mixture of ferric chloride and aluminum chloride serving as the flocculating agent is 1:2, the primary membrane separation processor is used for nanofiltration, the secondary membrane separation processor is used for ultrafiltration, and the resonance frequency of the ultrasonic device is controlled to be 1000 kHz;
the concentration of suspended matters in the coal washing water used in the embodiment is 6283mg/L, the COD content is 1037mg/L, and the pH value is 7.5; the adding amount of the flocculating agent is as follows: using iron and aluminum (as Fe) in flocculant3+And Al3+Calculated) the mass ratio of the mass to the coal mine wastewater is 5: 10000.
example 2
On the basis of the embodiment 1, the magnetic flocculant is prepared by the following steps:
A) preparing a ferric waste acid stock solution, namely preparing a ferric waste acid solution with the mass percentage concentration of 18-20% by using waste acid and a ferric waste liquid;
B) preparing a ferromagnetic material: preparing iron oxide particles by one or more of a precipitation method, a colloid chemical method and a hydrothermal method;
C) preparing an aluminum-iron mixed liquid, putting the iron-containing waste acid stock solution into a reaction container with a stirring device in batches, putting excessive aluminum slag, and reacting the aluminum slag and the iron-containing waste acid stock solution under the stirring state of the stirring device, wherein the mass ratio of aluminum to iron in the aluminum-iron mixed liquid is 5: 8;
D) and respectively adding the ferric oxide particles and oxidant sodium chlorate into the aluminum-iron mixed solution, and continuously stirring for reacting for 2 hours to finally obtain the magnetic flocculant, wherein the ferric oxide particles are prepared.
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 (10)
1. A coal mine treatment method is characterized by comprising the following steps:
1. introducing coal mine wastewater into a sedimentation tank for sedimentation pretreatment, arranging ultrasonic equipment in the sedimentation tank for carrying out ultrasonic treatment on the coal mine wastewater, and turning off an ultrasonic device after turning on for 3-10 min;
2. adding a flocculating agent into a sedimentation tank, starting a stirring device for stirring, wherein the stirring speed is adjusted based on the formed size of the flocs and is 80-600 r/min; the flocculant is ferric salt and/or aluminum salt flocculant;
3. adding a flocculating agent into the wastewater, uniformly mixing, then restarting the ultrasonic device for 2-5min, and introducing the wastewater into an inclined plate sedimentation tank for sedimentation;
4. sludge dewatering treatment is carried out after the dregs in the inclined plate sedimentation tank are discharged, and the supernatant in the inclined plate sedimentation tank is introduced into a primary membrane treatment process;
5. introducing concentrated water of the primary membrane treatment process into a secondary membrane treatment process, and recycling clean water of the primary membrane treatment process for coal mine production;
6. extracting and recovering concentrated water in the secondary membrane treatment process, performing advanced oxidation treatment on the residual extraction raffinate, and introducing into a conventional biochemical treatment process;
7. and introducing clear water in the secondary membrane treatment process into the conventional biochemical treatment process for further treatment.
2. The coal mine wastewater treatment method of claim 1, wherein the flocculant comprises the following components: one or more of polyaluminum ferric chloride, polyaluminum chloride, polyferric chloride, aluminum sulfate, ferric chloride, ferrous chloride, ferric sulfate and ferrous sulfate.
3. The coal mine wastewater treatment method according to claim 1, wherein ferromagnetic particles are added to the flocculant, and the ferromagnetic particles are iron oxide particles.
4. The coal mine wastewater treatment method according to claim 3, wherein the mass ratio of the iron salt and/or the aluminum salt to the ferromagnetic fine particles is 1: 0.2-3.
5. The coal mine wastewater treatment method according to claim 1, wherein a mud scraper is arranged on the inclined plate in the inclined plate sedimentation tank to clean sediment on the inclined plate; the inclined plate is connected with an electromagnetic device which can provide a magnetic field.
6. The coal mine wastewater treatment method according to claim 1, wherein the primary membrane separation processor is ultrafiltration or nanofiltration, and the secondary membrane separation processor 4 is ultrafiltration.
7. The coal mine wastewater treatment method as set forth in claim 1, wherein the resonance frequency of the ultrasonic device is controlled to be 500-5800 kHz.
8. The coal mine wastewater treatment method according to claim 3, wherein the magnetic flocculant is prepared from the flocculant and ferromagnetic particles, and the magnetic flocculant is prepared by the following steps:
A) preparing a ferric waste acid stock solution, namely preparing a ferric waste acid solution with the mass percentage concentration of 18-20% by using waste acid and a ferric waste liquid;
B) preparing a ferromagnetic material: preparing iron oxide particles by one or more of a precipitation method, a colloid chemical method and a hydrothermal method;
C) preparing an aluminum-iron mixed solution, putting the iron-containing waste acid stock solution into a reaction container with a stirring device in batches, putting excessive aluminum slag, and reacting the aluminum slag and the iron-containing waste acid stock solution under the stirring state of the stirring device;
D) and respectively adding the ferric oxide particles and oxidant sodium chlorate into the aluminum-iron mixed solution, and continuously stirring for reacting for 2 hours to finally obtain the magnetic flocculant.
9. The coal mine wastewater treatment method according to claim 8, wherein the mass ratio of aluminum to iron in the aluminum-iron mixed liquid is 5: 6-12.
10. The coal mine wastewater treatment method as set forth in claim 9, wherein the ultrasonic device is intermittently turned on for 5-10 min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113045105A (en) * | 2021-04-15 | 2021-06-29 | 山西水务集团建设投资有限公司 | High-efficient magnetization of sewage adsorbs processing system |
| CN115304197A (en) * | 2021-05-06 | 2022-11-08 | 中国石油天然气股份有限公司 | Fracturing flow-back fluid treatment device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113045105A (en) * | 2021-04-15 | 2021-06-29 | 山西水务集团建设投资有限公司 | High-efficient magnetization of sewage adsorbs processing system |
| CN115304197A (en) * | 2021-05-06 | 2022-11-08 | 中国石油天然气股份有限公司 | Fracturing flow-back fluid treatment device and method |
| CN115304197B (en) * | 2021-05-06 | 2023-12-01 | 中国石油天然气股份有限公司 | Fracturing flowback fluid treatment device and method |
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