CN105174580A - Desulphurization waste-water zero discharge processing system and technology - Google Patents
Desulphurization waste-water zero discharge processing system and technology Download PDFInfo
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Abstract
A related desulphurization waste-water zero discharge processing system comprises a neutralization adjusting basin, a coagulation sedimentation basin and a flocculation sedimentation basin which are in successive connection. In the flocculation sedimentation basin, a supernatant formed in a specially-produced metering water channel flows into a supernatant processing device, and the lower dense liquid flows into a lower-dense-liquid processing device. The supernatant processing device comprises a full-automatic softening filter, an ultrafilter, a first-grade RO (reverse osmosis) device and a second-grade RO device; the outlet of the second-grade RO device is connected with a dense liquid tank and a pure water tank, pure water in the pure water tank is reusable, and a dense liquid in the dense liquid tank enters a crystallization evaporator for generating a salt. The lower-dense-liquid processing device discharges solid waste. Wastewater separated from a sewage concentration tank is discharged into the neutralization adjusting basin via a pipe for cyclic once-more processing. The technical scheme is combined with an advanced membrane technology, the technological flow is simple, energy-saving and environment-friendly, environment protection benefit is obviously increased, a new zero-discharge technology is realized, and the technical scheme possesses significant meaning on water pollution treatment.
Description
Technical field
The invention belongs to technical field of waste water processing, especially a kind of desulfurization wastewater zero-discharge treatment system and technique.
Background technology
Along with the construction with large coal-fired power plant that develops rapidly of China's energy industry, firing rate constantly increases, SO
2quantity discharged get more and more, the topsoil caused also is on the rise, and takes desulfurization measure extremely urgent.
Current flue gas desulfurization is considered to control SO
2the most effective approach.The desulfurization wastewater that this wet fuel gas desulfurizing technology produces, containing a large amount of suspended substance (gypsum particle, SiO in these waste water
2, aluminium and iron oxyhydroxide), activated silica, COD, chlorion, fluorion, calcium ion, magnesium ion, high salt amount and trace heavy metal, as arsenic, cadmium, chromium, mercury etc., direct discharge will cause serious harm to environment, thus must be administered and could discharge desulfurization wastewater.
Patent documentation disclosed in finding following two sections through retrieval, concrete disclosure is as follows:
1, patent documentation: a kind of novel wet flue gas desulfurization waste water treatment process (notification number CN103351066A), desulfurization wastewater takes from the knockout drum underflow of vacuum belt dewaterer, and its solid content significantly reduces, and reduces a large amount of mud discharging.Desulfurization wastewater solid content through natural subsidence reduces further, can meet the condition recycled in factory.Waste water three header, waste water dosing system, waste-water vortex device and mud pressing device can be cancelled, decrease operation expense and facility investment, reduce overhead simultaneously; Simultaneously in order to meet the different needs, can retain medicine system and the mud pressing device of waste water three header selectively, the pH value of adjustable desulfurization wastewater and the heavy metal removed in desulfurization wastewater, make the desulfurization wastewater after process reach discharging standards.
2, patent documentation: desulfurization wastewater reuse and Zero discharge treatment method and equipment (notification number CN103708666A), the method step comprises: pre-treatment, chemical reaction handling, separating treatment, purification filtering process and evaporative crystallization process, finally obtains purifying waste water and salt for reuse.Equipment comprises pre-treatment supernatant device, reaction unit, circulation device, topping-up pump, separation host, strainer, reverse osmosis main frame and evaporative crystallizer.
Finding through contrast, there are the different of essence in patent application of the present invention and above-mentioned patent publication us.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art; a kind of desulfurization wastewater zero-discharge treatment system and technique are provided; the mode that this technique is superposed by chemical reaction and Physics Work state; improve the clearance of heavy metal ions in wastewater, hardness ions and COD; greatly reduce the fouling of reverse osmosis membrane; ensure that whole system is stable, work reliably; greatly reduce reverse osmosis membrane replacement probability; by native system finally obtained solid salt, the purifying waste water of solid waste and reuse; finally achieve zero release, protect environment.
The solution of the present invention is achieved in that
A kind of desulfurization wastewater zero-discharge treatment system, comprise in connecting successively and equalizing tank, coagulative precipitation tank and flocculation sedimentation tank, in this flocculation sedimentation tank, the supernatant liquor formed through special metering water channel flows in supernatant liquor treatment unit, and lower dope flows into lower dope treatment unit.
And, described supernatant liquor treatment unit comprise connect successively full-automatic softening filter, intermediate softening water tank, ultra-fine filter, ultrafiltration water tank, one-level RO reverse osmosis, middle pure water tank, secondary RO reverse osmosis, the outlet of this two-pass reverse osmosis connects dense water tank and clear water tanks respectively, water purification in clear water tanks can reuse, and the dense water in dense water tank enters crystallizing evaporator and obtains crystal salt.
And described lower dope treatment unit comprises the sludge condensation case and sheet frame sludge filter press that connect successively, be positioned at the dope of flocculation sedimentation tank bottom by after sludge condensation case and sheet frame sludge filter press, discharge solid waste; During the waste water that sludge condensation case is separated is imported by pipeline and equalizing tank, carrying out circulating processes again.
And, in described be connected PH setting device above equalizing tank, this PH setting device is made up of molten medicine-chest, dosing tank and the dosing pump connected successively.
And all install Physics Work state machine in described and in equalizing tank and coagulative precipitation tank, described Physics Work state machine comprises motor and stirring rod, motor drive stirring rod to rotate thus by coagulative precipitation tank and in and the internal liquid sufficient reacting of equalizing tank.
And described stirring rod comprises stock and paddle, in each stirring rod, two paddles are installed at staggered interval, and paddle is rectangular slat structure.
And vertically parallel interval installs two pieces of dividing plates in described flocculation sedimentation tank, be wherein positioned at bottom the lower partition of water-in side and pond body and be solidly installed, certain gap is left on top; The dividing plate top and the body top, pond that are positioned at water outlet side are solidly installed, and certain gap is left in bottom.
A kind of desulfurization wastewater Zero-discharge treating process, step is as follows:
Step one, neutralization regulates
In and add the liquid of certain metering in equalizing tank, make most heavy metal ion in alkaline environment, generate the precipitation of hydroxide of indissoluble;
Step 2, coagulating sedimentation
After adding medicament in desulfurization wastewater when pH value arrives 9.0 to 9.5, most of heavy metal ion all defines the oxyhydroxide of indissoluble, the Ca simultaneously in water
2+can also with the part F in waste water
-reaction, generates the CaF of indissoluble
2precipitate and reach the effect of removing fluorine; Coagulating agent and Physics Work state machine with the use of object be impel its settling velocity;
Step 3, flocculation sediment
Flucculation process makes alternately particle and suspended particle cohesion occur and assemble, and add flocculation agent and make liquid sufficient reacting, after the precipitation regular hour, the top of flocculation sedimentation tank is supernatant liquor, and its underpart is dope;
Step 4, the supernatant liquor treatment process in flocculation sedimentation tank and lower dope treatment process.
And in described step 4, supernatant liquor treatment process comprises the steps:
(1) softening filtration
Effectively removed the calcium ion in waste water by full-automatic softening filter, its objective is the ultrafiltration in protection subsequent disposal, reverse osmosis unit; Softening agent has the effect of filtration concurrently simultaneously;
(2) ultra-filtration filters
Ultra-fine filter automatic backwash in operational process, ensure that not contaminated;
(3) reverse osmosis concentration
Dense water obtains crystal salt through I and II RO reverse osmosis and crystallizing evaporator, is improved the salt concn in waste water, evaporative crystallization saves energy consumption by reverse osmosis, enrichment process; Through the Purified water re-use that reverse osmosis concentration produces;
In described step 4, lower dope treatment process comprises the steps:
Described lower dope, by after sludge condensation case and sheet frame sludge filter press, discharges solid waste and waste water, and during waste water is imported by pipeline and equalizing tank, carrying out circulating processes again.
Advantage of the present invention and positively effect are:
1, the present invention passes through the mode of chemical reaction and the superposition of Physics Work state machine, improve the clearance of heavy metal ions in wastewater, hardness ions and COD, greatly reduce reverse osmosis membrane fouling, ensure that whole system is stable, work reliably, greatly reduce reverse osmosis membrane turnover rate;
2, present system desulfurization wastewater carried out neutralize, precipitate, sludge treatment, filtration formed afterwards can the purifying waste water of reuse, solid waste and salt; again process during the waste water formed in treating processes is back to by pipeline and in equalizing tank or coagulative precipitation tank; do not form secondary wastewater; finally achieve zero release, protect environment.
3, this technique combines with advanced Membrane Technology; after desulfurization wastewater process; simple and the energy-conserving and environment-protective of this technical process, environmental protection benefit obviously increase; achieve " zero release " novel process; realize the target of energy-saving and emission-reduction; preserve the ecological environment, avoid water body and groundwater pollution, significant to water pollution control.
Accompanying drawing explanation
Fig. 1 is system interface chart of the present invention;
Fig. 2 is the connection block diagram of supernatant liquor treatment unit in Fig. 1;
Fig. 3 is the connection block diagram of lower dope treatment unit in Fig. 1;
Fig. 4 be in Fig. 1 in and the PH setting device structural representation of equalizing tank;
Fig. 5 is the structural representation of coagulative precipitation tank in Fig. 1;
Fig. 6 is the vertical view of stirring rod in Fig. 5;
The structural representation of flocculation sedimentation tank in Fig. 7 Fig. 1;
Fig. 8 is process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing, also by specific embodiment, the invention will be further described.
A kind of desulfurization wastewater zero-discharge treatment system, as shown in Figure 1, comprise in connecting successively and equalizing tank, coagulative precipitation tank and flocculation sedimentation tank, in this flocculation sedimentation tank, the supernatant liquor formed through special metering water channel flows in supernatant liquor treatment unit, and lower dope flows into lower dope treatment unit.
Described supernatant liquor treatment unit as shown in Figure 2, comprise connect successively full-automatic softening filter, intermediate softening water tank, ultra-fine filter, ultrafiltration water tank, one-level RO reverse osmosis, middle pure water tank, secondary RO reverse osmosis, the outlet of this two-pass reverse osmosis connects dense water tank and clear water tanks respectively, water purification in clear water tanks can reuse, now in dense water tank, the concentration of dense water is higher, part can spontaneous nucleation, and this dense water enters crystallizing evaporator and produces salt.The clear liquid being positioned at flocculation sedimentation tank top carries out reuse by obtaining water purification after this device process, and by desulfurization wastewater reuse to greatest extent, saving water resource, alleviates the predicament of water resources critical shortage.During the waste water that full-automatic softening filter produces imports and equalizing tank; The waste water that ultra-fine filter produces imports coagulative precipitation tank, achieves the object of waste water circulation process in system, prevents direct discharging of waste water from polluting.
Described lower dope treatment unit comprises the sludge condensation case and sheet frame sludge filter press that connect successively, is positioned at the dope of flocculation sedimentation tank bottom by after sludge condensation case and sheet frame sludge filter press, discharges solid waste (solid waste); During the waste water that sludge condensation case is separated is imported by pipeline and equalizing tank, carrying out circulating processes again.
Be connected PH setting device with above equalizing tank 1 in described, as shown in Figure 4, this PH setting device is made up of the molten medicine-chest 4 connected successively, dosing tank 3 and dosing pump 2, adds corresponding liquid according to the pH value difference in waste water.
In described with in equalizing tank and coagulative precipitation tank 5, Physics Work state machine is all installed.Described Physics Work state machine comprises motor 6 and stirring rod 7, as shown in Figure 5, motor drive stirring rod to rotate thus by coagulative precipitation tank and in and the internal liquid sufficient reacting of equalizing tank.The structure of stirring rod as shown in Figure 6, comprises stock 7B and paddle 7A, and interleaved 90 degree of installations two paddles in each stirring rod, paddle is rectangular slat structure.This paddle is reasonable in design, can be abundant by the liquid reactions in pond.The waste liquid realized in pond by Physics Work state machine is flowed fast and mutually clashes into and produces whirlpool, by the mutual superposition of chemical reaction and Physics Work state machine, heavy metal ion, hardness ions and COD in effective removal waste liquid, make it precipitation, greatly reduce the fouling of reverse osmosis membrane.
As shown in Figure 7, in this pond, vertical parallel interval installs two pieces of dividing plates 9 to the structure of described flocculation sedimentation tank 8, and be wherein positioned at bottom the lower partition of water-in side and pond body and be solidly installed, certain gap is left on top; The dividing plate top and the body top, pond that are positioned at water outlet side are solidly installed, and certain gap is left in bottom, and its object makes flocculation sediment pass through through sluice.The flow direction of liquid is by the direction of arrow in Fig. 7 figure.By this kind of runner design, effectively improve flocculation sediment effect, and reduce the volume of whole pond body.
A kind of desulfurization wastewater Zero-discharge treating process, as shown in Figure 8, step is as follows:
Step one, neutralization regulates
Desulfurization wastewater is generally in acid, the first technique of wastewater treatment neutralizes exactly, namely in and add the sodium hydroxide solution of certain metering in equalizing tank, the pH value of waste water is arrived more than 9.0, make most heavy metal ion in alkaline environment, generate the precipitation of hydroxide of indissoluble, the less developer of sodium hydroxide, easy to operate, environment is clean.Produce a large amount of salkali waste during negative resin regeneration during ion-exchange water, so just can reach the object of the treatment of wastes with processes of wastes against one another.
Step 2, coagulating sedimentation
After adding basic agent in desulfurization wastewater when pH value arrives 9.0 to 9.5, most of heavy metal ion all defines the oxyhydroxide of indissoluble, the Ca simultaneously in water
2+can also with the part F in waste water
-reaction, generates the CaF of indissoluble
2precipitate and reach the effect of removing fluorine.Cd in waste water after neutralizing treatment
2+, Hg
2+content still likely exceed standard, so add organic sulfide (TMT15) or sodium sulphite in coagulative precipitation tank, the deposition of sulfides making itself and the heavy metal contaminants of remaining ionic state form indissoluble gets off, add coagulating agent and Physics Work state machine with the use of object be impel its settling velocity, coagulating agent is polymeric aluminum.
Step 3, flocculation sediment
Suspension content in desulfurization wastewater is comparatively large, wherein containing gypsum particle, SiO
2,the oxyhydroxide of aluminium and iron.Adopt flucculation process to make alternately particle and suspended particle cohesion occur and assemble, add flocculation agent and make liquid sufficient reacting, flocculation agent is polyacrylamide, and after the precipitation regular hour, the top of flocculation sedimentation tank is supernatant liquor, and its underpart is dope.
Step 4, the supernatant liquor treatment process in flocculation sedimentation tank and lower dope treatment process.
In described step 4, supernatant liquor treatment process comprises the steps:
(1) softening filtration
Full-automatic softening filter effectively can remove the calcium ion in waste water, its objective is the reverse osmosis unit in protection subsequent disposal; Softening agent has the effect of filtration concurrently simultaneously.
(2) ultra-filtration filters
Dense water obtains crystal salt through I and II RO reverse osmosis and crystallizing evaporator, improves the salt concn in waste water, evaporative crystallization saves energy consumption by reverse osmosis concentration; Through the Purified water re-use that reverse osmosis concentration produces;
In operational process, ultra-fine filter can automatic backwash, ensure that not contaminated, thus ensure that whole system is stable, runs reliably.Adopt the high performance ultrafiltration membrane material of PVDF, be beneficial to cleaning, antipollution.
(3) reverse osmosis concentration
The dense water that waste water produces through reverse osmosis concentration obtains crystal salt by crystallizing evaporator, can be improved the salt concn in waste water, evaporative crystallization saves energy consumption by reverse osmosis concentration; Can reuse through purifying waste water of producing of reverse osmosis concentration, the water resources of the preciousness of effectively saving.
In described step 4, lower dope treatment process comprises the steps:
Described lower dope, by after sludge condensation case and sheet frame sludge filter press, discharges solid waste (solid waste) and waste water, and during waste water is imported by pipeline and equalizing tank, carrying out circulating processes again.
Advantageous effect of the present invention is:
1, the present invention passes through the mode of chemical reaction and the superposition of Physics Work state machine, improve the clearance of heavy metal ions in wastewater, hardness ions and COD, greatly reduce reverse osmosis membrane fouling, ensure that whole system is stable, work reliably, greatly reduce reverse osmosis membrane turnover rate;
2, present system desulfurization wastewater carried out neutralize, precipitate, sludge treatment, filtration formed afterwards can the purifying waste water of reuse, solid waste and salt; again process during the waste water formed in treating processes is back to by pipeline and in equalizing tank or coagulative precipitation tank; do not form secondary wastewater; finally achieve zero release, protect environment.
3, this technique combines with advanced Membrane Technology; after desulfurization wastewater process; simple and the energy-conserving and environment-protective of this technical process, environmental protection benefit obviously increase; achieve " zero release " novel process; the target of energy-saving and emission-reduction can be realized; preserve the ecological environment, avoid water body and groundwater pollution, significant to water pollution control.
It is emphasized that; embodiment of the present invention is illustrative; instead of it is determinate; therefore the present invention includes the embodiment be not limited to described in embodiment; every other embodiments drawn by those skilled in the art's technical scheme according to the present invention, belong to the scope of protection of the invention equally.
Claims (9)
1. a desulfurization wastewater zero-discharge treatment system, it is characterized in that: comprise in connecting successively and equalizing tank, coagulative precipitation tank and flocculation sedimentation tank, in this flocculation sedimentation tank, the supernatant liquor formed through metering water channel flows in supernatant liquor treatment unit, and lower dope flows into lower dope treatment unit.
2. desulfurization wastewater zero-discharge treatment system according to claim 1, it is characterized in that: described supernatant liquor treatment unit comprise connect successively full-automatic softening filter, intermediate softening water tank, ultra-fine filter, ultrafiltration water tank, one-level RO reverse osmosis, middle pure water tank, secondary RO reverse osmosis, the outlet of this two-pass reverse osmosis connects dense water tank and clear water tanks respectively, water purification in clear water tanks can reuse, and the dense water in dense water tank enters crystallizing evaporator and obtains crystal salt.
3. desulfurization wastewater zero-discharge treatment system according to claim 1 and 2, it is characterized in that: described lower dope treatment unit comprises the sludge condensation case and sheet frame sludge filter press that connect successively, be positioned at the dope of flocculation sedimentation tank bottom by after sludge condensation case and sheet frame sludge filter press, discharge solid waste; During the waste water that sludge condensation case is separated is imported by pipeline and equalizing tank, carrying out circulating processes again.
4. desulfurization wastewater zero-discharge treatment system according to claim 1, is characterized in that: in described be connected PH setting device above equalizing tank, this PH setting device is made up of molten medicine-chest, dosing tank and the dosing pump connected successively.
5. desulfurization wastewater zero-discharge treatment system according to claim 1, it is characterized in that: in described with in equalizing tank and coagulative precipitation tank, Physics Work state machine is all installed, described Physics Work state machine comprises motor and stirring rod, motor drive stirring rod to rotate thus by coagulative precipitation tank and in and the internal liquid sufficient reacting of equalizing tank.
6. desulfurization wastewater zero-discharge treatment system according to claim 5, is characterized in that: described stirring rod comprises stock and paddle, and in each stirring rod, two paddles are installed at staggered 90 degree of intervals, and paddle is rectangular slat structure.
7. desulfurization wastewater zero-discharge treatment system according to claim 1, it is characterized in that: in described flocculation sedimentation tank, vertically parallel interval installs two pieces of dividing plates, wherein be positioned at bottom the lower partition of water-in side and pond body and be solidly installed, certain gap is left on top; The dividing plate top and the body top, pond that are positioned at water outlet side are solidly installed, and certain gap is left in bottom.
8. the desulfurization wastewater Zero-discharge treating process as described in claim 1 to 7, is characterized in that: step is as follows:
Step one, neutralization regulates
In and add the liquid of certain metering in equalizing tank, make most heavy metal ion in alkaline environment, generate the precipitation of hydroxide of indissoluble;
Step 2, coagulating sedimentation
After adding medicament in desulfurization wastewater when pH value arrives 9.0 to 9.5, most of heavy metal ion all defines the oxyhydroxide of indissoluble, the Ca simultaneously in water
2+can also with the part F in waste water
-reaction, generates the CaF of indissoluble
2precipitate and reach the effect of removing fluorine; Coagulating agent and Physics Work state machine with the use of object be impel its settling velocity;
Step 3, flocculation sediment
Flucculation process makes alternately particle and suspended particle cohesion occur and assemble, and add flocculation agent and make liquid sufficient reacting, after the precipitation regular hour, the top of flocculation sedimentation tank is supernatant liquor, and its underpart is dope;
Step 4, the supernatant liquor treatment process in flocculation sedimentation tank and lower dope treatment process.
9. a desulfurization wastewater Zero-discharge treating process as claimed in claim 8, it is characterized in that: in described step 4, supernatant liquor treatment process comprises the steps:
(1) softening filtration
Effectively removed the calcium ion in waste water by full-automatic softening filter, its objective is the reverse osmosis unit in protection subsequent disposal; Softening agent has the effect of filtration concurrently simultaneously;
(2) ultra-filtration filters
Ultra-fine filter automatic backwash in operational process, ensure that not contaminated;
(3) reverse osmosis concentration
Dense water obtains crystal salt through I and II RO reverse osmosis and crystallizing evaporator, improves the salt concn in waste water, evaporative crystallization saves energy consumption by reverse osmosis concentration; Through the Purified water re-use that reverse osmosis concentration produces;
In described step 4, lower dope treatment process comprises the steps:
Described lower dope, by after sludge condensation case and sheet frame sludge filter press, discharges solid waste and waste water, and during waste water is imported by pipeline and equalizing tank, carrying out circulating processes again.
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