CN105967405A - Treating and recycling method of coal washing wastewater - Google Patents
Treating and recycling method of coal washing wastewater Download PDFInfo
- Publication number
- CN105967405A CN105967405A CN201610488913.1A CN201610488913A CN105967405A CN 105967405 A CN105967405 A CN 105967405A CN 201610488913 A CN201610488913 A CN 201610488913A CN 105967405 A CN105967405 A CN 105967405A
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- Prior art keywords
- water
- tank
- coal
- coal washing
- electricity flocculation
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
-
- 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
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to recycling process using electric flocculation process to treat coal washing wastewater. The recycling process is characterized in that the coal washing wastewater passes an electric flocculation component first, the electrodes of the electric flocculation component are soluble electrodes, the soluble electrodes are especially aluminum substrates, metal cation Al<3+> is formed after direct currents or pulse rectangular wave currents are applied to the soluble electrodes and the anode aluminum substrate loses electrons, the metal cation Al<3+> reacts with OH- in the solution to generate metal hydroxide colloid flocculant, and the metal hydroxide colloid flocculant combines with pollutants and the like in wastewater to generate large floc; the large floc passes a reaction tank and a stirring tank, discharged water enters a settling tank, the supernatant of the settling tank enters a clear water tank and delivered to a quartz filter through a filter water feeding pump, and water discharged from the quartz filter is recycled by a coal washing plant. The treatment system used by the recycling process is stable in treatment effect, simple to operate, capable of reducing floor space and good in coal washing wastewater treatment effect.
Description
One, technical field
A kind of method that the present invention relates to coal washing waste water treatment for reuse method.
Two, background technology
Containing substantial amounts of coal slime and silt particle, float, colloid etc. in coal washing waste water, its turbidity of undressed black water can
To reach more than 2000NTU.The small coal dust of some in coal washing waste water is highly stable in water, and some very fine breezes are suspended in
In water, up to some months, natural subsidence also will not occur.It addition, coal washing waste water is mainly weakly alkaline waste water, concentration of suspension
The highest with CODcr concentration.
Coal preparation plant generally uses " flocculation-cyclone-thickener-pressure filter (coal slime precipitation to the process of black water
Pond) " process technique.It it is the most all buying machine high polymer coagulant (polyacrylamide).High polymer coagulant and coal slime
Microgranule or coal slime colloid action by contact, neutralized the electrical of coal slime surface, drops low-surface-energy, makes coal slime particle coagulation precipitate.Poly-
The molecular weight of acrylamide typically between million, the flocculant of black water different molecular weight to be selected of different grain size composition.
Polyacrylamide can be divided into anion-polyacrylamide, PAMC and non-ionic polyacrylamide three kinds
Type.Using polyacrylamide to carry out water process when, it is ensured that type matches with the pH value of black water, anion is gathered
Acrylamide be suitable to meta-alkalescence black water, PAMC be suitable to slant acidity black water, anionic and sun from
Subtype polyacrylamide is used in mixed way.The method of above-mentioned prior art coal-washing wastewater treatment, uses at the compositions of following component
Reason coal washing waste water: activated carbon, zeolite group mineral, montmorillonite, polyacrylamide, aluminium polychlorid, calcium hydroxide.The present invention can be high
The impurity such as the Organic substance imitate, adsorb rapidly, removed in coal washing waste water and inorganic matter, it is achieved the qualified discharge of waste water, but reuse
Quality inadequate.
CN2014106404155 discloses a kind of coal washing waste water circulating disposal process, and technique comprises the steps: clear water reserviors
In water entered into by pipeline coal washer carry out coal washing operation, the black water produced during coal washing enters micro-through straight line shaker
Backwater after screen processes enters the water collecting pit under drain sump or screen；The backwater collected is at the work of flotation device sewage pump
Arriving flotation device again after adding medicament with lower entrance preprocessor, the supernatant liquid after flotation device processes enters floating essence pond, coal slime liquid row
Enter coal slime pond；Supernatant liquid in floating essence pond enters floating pressure-sizing filter under the effect of Feeding Pump for Filter Press, at floating pressure-sizing filter
After reason, the clear water of row enters clear water reserviors；Coal slime liquid concentrated machine pan feeding pump in coal slime pond enters thickener, adds medicament
Concentrated machine goes into clear water and coal slime after processing, and clear water enters clear water reserviors, and coal slime enters under coal slime Feeding Pump for Filter Press effect
After the process of coal slime pressure filter, the clear water of stroke enters clear water reserviors through pipeline.Medicament and flotation are still not enough to obtain quality capable of circulation
Water, amount of pollutant is big.
CN201310578862 discloses a kind of coal washing waste water solid-liquid separation system and separation method thereof.The molten medicine of this system
Case is connected with chemical tank, and chemical tank is connected with flocculation stirring case by dosing pump, and wastewater disposal basin passes through water pump and flocculation stirring case phase
Even, flocculation stirring case is connected with coal washing solid-liquid separating machine, and coal washing solid-liquid separating machine is connected with filtrate depositing reservoir.The coal washing of the present invention
Waste water solid piece-rate system construction is little, and the completion time of project is short, and processing procedure technique is simple, continuous, can be quickly to washing
Coal waste water carries out solid-liquid separation, the clear liquid separated after precipitation can direct reuse in production, simplification of flowsheet, effectively
Using water wisely.
Electricity flocculation can apply the multiple industry processed at waste water.Such as electroplating wastewater, bleachinges and dyeing and textile waste, paper mill
Waste water, slaughterhouse water, garbage leachate wastewater reason, petrochemical industry, the paint waste water such as dyestuff, pigment, it is also used for cooling tower
Waste water, steamer biloge water purifies, and gathering ground, harbour purifies, treating of wood waste water, Scenic Spots sanitary sewage disposal.But
Have no for coal washing waste water circulating disposal process.
Three, summary of the invention
The present invention seeks to, a kind of method proposing electricity flocculation process coal-washing wastewater treatment, water can be with reuse and be processed into
This is low.
The reuse technology of a kind of electricity flocculation process coal-washing wastewater treatment, coal washing waste water first passes around electricity flocculation assembly, electricity wadding
Solidifying electrode uses solubility electrode, solubility electrode especially aluminum substrate or pulse square wave electric current, passes to direct current or pulse square wave
After electric current, after anode aluminum substrate loses electronics, form metal cation Al3+, generate metal hydroxides with the OH-in solution
Colloid flocculant, the colloid in this kind of hydrogen in statu nascendi oxide active height, high adsorption capacity, with former water, float, solubility are dirty
Dye thing, antibacterial, virus etc. combine and generate bigger flock, and reacted groove, agitator tank, water outlet enters sedimentation tank, sedimentation tank supernatant
Entering filtered water tank night, then deliver to quartz filter through filter feed pump, quartz filter water outlet is for coal washery reuse.
The anode aluminum substrate electrical current density of electricity flocculation assembly is not less than 3mA/cm2.Electricity flocculation time is no less than
10min。
Reactive tank, the time of staying of agitator tank are not less than 15min.Reactive tank adds sodium hydroxide or lime water etc., shape
Become the shallow lake things such as calcium hydroxide and precipitate.
The time of staying of sedimentation tank is not less than 1h.
The method have the benefit that stable water outlet is up to standard；Concise in technology, it is easy to operation；Outside pipe arrangement is few, installs maintenance work
Measure little；Rationally, technique is simple, it is little to take up an area in equipment configuration；Utilizing electricity flocculation process, turbidity can reduce and reaches more than 99%.Can be complete
Entirely meet the standard of Water circulation, and low cost, relatively low mud output.The processing system using the present invention also has following effect,
Treatment effect is stable, and operation runs simplicity, can reduce floor space, and it is the best to process coal washing waste water.
Four, accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention.
Five, detailed description of the invention
As it can be seen, carry out Treatment for Reuse from coal washing waste water, water inlet (coal washing waste water, 2000NTU or more than), it is directly entered
Electricity flocculation assembly, after electricity flocculation energising, is i.e. controlled the electric current (electrical current of electricity flocculation assembly by electricity flocculation power supply voltage stabilization and current stabilization cabinet
Density is not less than 3mA/cm2), after electricity flocculation assembly water outlet, enter reactive tank, agitator tank, at agitator tank i.e. it can be seen that significantly
Alumen ustum, then through sedimentation tank, the time of staying is no less than 1h, reactive tank, the time of staying of agitator tank are not less than 15min；In reactive tank
Add sodium hydroxide or lime water, form the shallow lake things such as calcium hydroxide and precipitate.The dosage of sodium hydroxide or lime water makes pH value reach
To 8-9；Sedimentation tank supernatant enters filtered water tank, then delivers to quartz filter through filter feed pump, and quartz filter goes out
Water is for coal washery reuse.
Electricity flocculation assembly includes electrolysis bath and electricity flocculation power supply, and electrolysis bath is typically made with general steel plate.Pole plate takes suitably
Spacing, to ensure that power consumption is less and to be easily installed, run and keep in repair.In electrolysis bath, aluminium sheet is placed in the central position of electrolysis bath
Putting, after energising, under External Electrical Field, anode loses electronics generation oxidation reaction, and negative electrode obtains electronics generation reduction reaction.Useless
Water flows through electrolysis bath, electricity flocculation power supply process: electricity flocculation power supply can use pulse square wave；Dutycycle: output pulse duty factor
Arbitrarily set in the range of 5-80%, output frequency: arbitrarily set in the range of 50HZ-3000HZ；Frequency and dutycycle can be single
Solely set；Output DC pulse amplitude continuously adjustabe, and can run continuously；When pulse amplitude rises or falls, setting defeated
Go out pulse frequency constant with dutycycle；On anode aluminium sheet, electrical current density is not less than 3mA/cm2.
Coal washing waste water can add a small amount of poly-aluminum (aluminium polychlorid), and the weight of interpolation is the 0.2-0.5% of wastewater quality；
Carrying out electric flocculating again, aluminium polychlorid is a kind of inorganic polymer coagulant, due to bridging action and the multivalence of hydroxide ion
The polymerization of anion and the inorganic polymer water treatment agent that molecular weight is relatively big, electric charge is higher that produces.Good stability, suitable
Answering waters width, hydrolysis rate is fast, high adsorption capacity, forms alumen ustum big, and the close precipitation of matter is fast, and delivery turbidity is low, and dewatering is good
Advantage, the pH value range width of adaptation, pH value need not be regulated specially.
The present invention each technique unit functional characteristics
Electricity flocculation processes at coal washing waste water and in reuse, can overcome the insoluble problem of chemical Treatment, can not only
Effectively remove heavy metal ions in wastewater, and salinity in water can be reduced, make the water energy repetitive cycling after process be used in
Former operation.Waste water after electricity flocculence processes can reach following treatment effect: Cr < 0.001, clearance maximum up to
100%；Ni < 0.005 clearance is maximum, up to 100%；Zn < 0.062 clearance is up to 57%.
Claims (7)
1. a reuse technology for electric flocculation process coal-washing wastewater treatment, is characterized in that step is as follows: coal washing waste water first passes around
Electricity flocculation assembly, electricity flocculation electrode uses solubility electrode, solubility electrode especially aluminum substrate or pulse square wave electric current, passes to
After direct current or pulse square wave electric current, after anode aluminum substrate loses electronics, form metal cation Al3+, raw with the OH-in solution
Become metal hydroxides colloid flocculant, in conjunction with generating bigger flock；The most reacted groove, agitator tank, water outlet enters sedimentation tank,
Sedimentation tank supernatant enters filtered water tank, then delivers to quartz filter through filter feed pump, and quartz filter water outlet is for washing
Coal works reuse.
Reuse technology the most according to claim 1, is characterized in that the anode aluminum substrate electrical current density of electricity flocculation assembly
Not less than 3mA/cm2；The electricity flocculation assembly time of staying is no less than 10min.
Reuse technology the most according to claim 1, it is characterized in that reactive tank, agitator tank the time of staying not less than 15min；
Reactive tank adds sodium hydroxide or lime water, forms calcium hydroxide shallow lake thing and precipitate.
Reuse technology the most according to claim 1, is characterized in that the time of staying of sedimentation tank is not less than 1h.
Reuse technology the most according to claim 2, is characterized in that electricity flocculation assembly includes electrolysis bath and electricity flocculation power supply, electricity
Solving groove and be placed in the middle position of electrolysis bath built with aluminium sheet, after energising, under External Electrical Field, anode loses electronics and aoxidizes
Reaction, negative electrode obtains electronics generation reduction reaction.
Reuse technology the most according to claim 5, is characterized in that electricity flocculation power supply can use pulse square wave；Output pulse accounts for
Empty ratio arbitrarily sets in the range of 5-80%, output frequency: arbitrarily set in the range of 50HZ-3000HZ；Frequency and dutycycle
Can individually set.
Reuse technology the most according to claim 2, is characterized in that coal washing waste water adds aluminium polychlorid, and the weight of interpolation is
The 0.2-0.5% of wastewater quality；Carry out electric flocculating again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610488913.1A CN105967405A (en) | 2016-06-28 | 2016-06-28 | Treating and recycling method of coal washing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610488913.1A CN105967405A (en) | 2016-06-28 | 2016-06-28 | Treating and recycling method of coal washing wastewater |
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| CN105967405A true CN105967405A (en) | 2016-09-28 |
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ID=57019327
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| CN201610488913.1A Pending CN105967405A (en) | 2016-06-28 | 2016-06-28 | Treating and recycling method of coal washing wastewater |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109293044A (en) * | 2018-10-08 | 2019-02-01 | 国电常州发电有限公司 | Defeated coal coal-contained wastewater processing transformation device |
| CN109701734A (en) * | 2019-01-21 | 2019-05-03 | 乌拉特中旗毅腾矿业有限责任公司 | A kind of coal slime clean utilization technique |
| CN111320334A (en) * | 2020-04-02 | 2020-06-23 | 四川锦城佳禾生态环保科技有限公司 | Powder-removing coal washing process for coal mine |
| CN112062339A (en) * | 2020-09-08 | 2020-12-11 | 江苏众志新禹环境科技有限公司 | Sludge retreatment type coal washing wastewater treatment method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109293044A (en) * | 2018-10-08 | 2019-02-01 | 国电常州发电有限公司 | Defeated coal coal-contained wastewater processing transformation device |
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| CN111320334A (en) * | 2020-04-02 | 2020-06-23 | 四川锦城佳禾生态环保科技有限公司 | Powder-removing coal washing process for coal mine |
| CN112062339A (en) * | 2020-09-08 | 2020-12-11 | 江苏众志新禹环境科技有限公司 | Sludge retreatment type coal washing wastewater treatment method |
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Application publication date: 20160928 |