CN104761094A - Method for processing coking wastewater employing efficient evaporation process - Google Patents
Method for processing coking wastewater employing efficient evaporation process Download PDFInfo
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- CN104761094A CN104761094A CN201510168947.8A CN201510168947A CN104761094A CN 104761094 A CN104761094 A CN 104761094A CN 201510168947 A CN201510168947 A CN 201510168947A CN 104761094 A CN104761094 A CN 104761094A
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Abstract
The invention relates to a method for processing coking wastewater employing an efficient evaporation process. The method comprises the following steps: carrying out softening pretreatment and heat exchange on coking wastewater, and entering an MVR evaporator; feeding superheated steam which is compressed by a steam compressor into the MVR evaporator, and heating wastewater circulating thick liquid; flowing evaporated steam condensate water into a condensate water bath at the bottom of the MVR evaporator, so as to realize solid-liquid separation; reusing distilled water, and doping a little of concentrated liquid into coal to burn; firstly, feeding steam into an acid pickling tower, and absorbing ammonia in wastewater by acid to generate an ammonium salt; entering an alkaline washing tower, absorbing organic matters by alkali, and generating an organic sodium salt; and entering the washed steam into the steam compressor to recycle. The coking wastewater is directly processed by an evaporation technology; the processed wastewater reaches the requirements of reuse water; and the discharged carnallite waste is burnt, so that the coking wastewater reaches zero emission; the wastewater treatment process route is greatly simplified; and the method and the device have the advantages of being compact in structure, small in floor area, low in investment and operation cost and simple to operate.
Description
Technical field
The present invention relates to Technologies of Coke Plant Wastewater Treatment field, particularly relate to a kind of method and the device that adopt high-efficiency evaporating art breading coking chemical waste water.
Background technology
At present, coked waste water process generally adopts Biological Denitrification Treatment Technologies, for meeting the requirement of every discharge index, have employed the combinations such as two-stage A/O, oxidation technology, complexing technology, adsorption technology.In the new GB10171-2012 " coking chemistry emission of industrial pollutants standard " put into effect of country, the burnt water displacement of indices and ton is arranged outward to coking chemical waste water and also been proposed higher requirement, therefore on original Process ba-sis, turn increase bi-membrane method recycling processing technique and concentrated solution treatment technology.But adopt this series of process to make coked waste water process route very long, not only invest high, floor space is large, and running cost is high, complicated operation.In addition, even if having employed recycling processing technique, still have 25 ~ 30% concentrated solutions to need to carry out subsequent disposal, and intractability is very large.
MVR is steam mechanical recompression, the abbreviation of (mechanical vapor recompression).MVR vaporizer is the energy re-using the secondary steam that it self produces, thus reduces a power-saving technology of the demand of the energy to external world.Its working process is compressed through compressor by the steam of low-temperature level, and temperature, pressure improve, and heat content increases, and then enters interchanger condensation, to make full use of the latent heat of steam.Except start up, steam is supplied without the need to outer in whole evaporative process, from vaporizer secondary steam out, compress through compressor, pressure, temperature raise, and heat content increases, and heating steam use is used as by the heating chamber then delivering to vaporizer, make feed liquid maintain boiling state, heating steam itself is then condensed into water.The original like this steam that will discard just is fully utilized, and reclaims latent heat, and improve thermo-efficiency, its economy is equivalent to 30 times of multiple-effect evaporation.Facility compact, floor space is little, can save cooling system again, therefore not only reduces investment outlay but also can obtain good energy-saving effect.
By MVR principle of work, adopt MVR high-efficiency evaporating technique direct Treatment of Wastewater in Coking can process simplification greatly, and improve the treatment effect of coking chemical waste water (strong brine containing discharging with embrane method cycle for the treatment of water sewage trainage apparatus).
Summary of the invention
The invention provides a kind of method adopting high-efficiency evaporating art breading coking chemical waste water, utilize the direct Treatment of Wastewater in Coking of evaporation technique, the waste water after process is made to reach the requirement of reuse water, the carnallite class waste discharged is through burning disposal, coking chemical waste water is made to reach zero release, enormously simplify waste water treatment process route, have that compact construction, floor space are little, investment running cost is low, simple operation and other advantages; Invention also provides the device that can realize this method.
In order to achieve the above object, the present invention realizes by the following technical solutions:
A kind of method adopting high-efficiency evaporating art breading coking chemical waste water, comprise preprocessing process, MVR evaporation process process and carrying out washing treatment process, be specially: coking chemical waste water is through softening pre-treatment and entering MVR vaporizer after heat exchange, heated waste water circulation dope in MVR vaporizer is entered by the superheated vapour after vapour compressor compresses, steam condensate after evaporation flows into MVR base of evaporator condensate draining and realizes solid-liquid separation, wherein distilled water reuse, a small amount of concentrated solution is mixed in coal and is burned; Steam is introduced into pickling tower, and the ammonia in waste water is absorbed by acid and generates ammonium salt, then enters soda-wash tower, and organism wherein, by Alkali absorption, generates Organic Sodium Salt; Steam after carrying out washing treatment enters vapour compressor recycle.
Described preprocessing process is that the calcium in waste water, magnesium and tenderizer react and generate calcium carbonate and magnesium hydroxide flco by adding caustic soda or soda ash softens; Add coagulating agent PAC, PAM again and carry out coagulation, make the solid of generation condense agglomerating together with a large amount of SS, colloid etc. that contain in liquid and grow up, finally in settling tank, carry out precipitate and separate.
Through pretreated coking chemical waste water, respectively in dope/wastewater heat exchange device, water of condensation/wastewater heat exchange device and vent condenser with dope, water of condensation heat exchange, then mix with the recycling waste water dope in vaporizer, and under concentrate circulating pumping action in vaporizer circulating and evaporating.
For realizing a kind of device adopting the method for high-efficiency evaporating art breading coking chemical waste water, comprise the pretreatment unit, MVR evaporation process unit and the carrying out washing treatment unit that connect successively, pretreatment unit is made up of equalizing tank, mixed flocculation reaction tank and flocculation sedimentation tank; MVR evaporation process unit is made up of MVR vaporizer and vapour compressor, and carrying out washing treatment unit is located in the steam circuit between MVR vaporizer and vapour compressor, is made up of pickling tower and soda-wash tower; MVR vaporizer is also provided with concentrate circulating loop.
Described mixed flocculation reaction tank connects caustic soda throwing device, PAC medicament addition device and PAM medicament addition device in addition; Sewage lagoon is established after flocculation sedimentation tank.
Coking chemical waste water pipeline before described MVR vaporizer is provided with water of condensation/wastewater heat exchange device, dope/wastewater heat exchange device and vent condenser, water of condensation/wastewater heat exchange device supplements mouth with the waste water that dope/parallel connection of wastewater heat exchange device is connected MVR vaporizer by the waste water tunnel of vent condenser afterwards, and water of condensation/wastewater heat exchange device connects condensation-water drain and the cartridge filter of vent condenser in addition; Dope/wastewater heat exchange device connects dope exhaust and the outlet of outer row's dope of MVR vaporizer in addition.
At the bottom of the tower of described pickling tower, discharge port connects ammonium salt reclamation groove in addition, and at the bottom of the tower of soda-wash tower, discharge port connects Organic Sodium Salt accumulator tank in addition.
Compared with prior art, the invention has the beneficial effects as follows:
1) utilize the direct Treatment of Wastewater in Coking of evaporation technique, make the waste water after process reach the requirement of reuse water, after process, waste liquid amount is less than 5% of the former water yield, can be used as water in dust removal or return being sprayed onto burning disposal in coal, makes coking chemical waste water reach zero release;
2) enormously simplify waste water treatment process route, have that compact construction, floor space are little, investment running cost is low, simple operation and other advantages.
Accompanying drawing explanation
Fig. 1 is process route chart one of the present invention.(preprocessing process)
Fig. 2 is process route chart two of the present invention.(MVR evaporation process process and carrying out washing treatment process)
In figure: 1. equalizing tank 2. waste water pump 1 mixed flocculation reaction tank 4. flocculation sedimentation tank 5. sewage lagoon 6. waste water pump two 7.PAC medicament addition device 8. caustic soda/soda ash throwing device 9.PAM medicament addition device 10. cartridge filter 11. water of condensation/wastewater heat exchange device 12. distilled water pump 13. vent condenser 14. dopes/wastewater heat exchange device 15. dope is drawn pump 16.MVR vaporizer 17. concentrate circulating pump 18. pickling tower 19. recycle pump 1 washing liquid pump 1 ammonium salt reclamation groove 22. soda-wash tower 23. recycle pump 24. and washed liquid pump 2 25. Organic Sodium Salt accumulator tank 26. vapour compressor
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
See Fig. 1-Fig. 2, it is process route chart of the present invention, a kind of method adopting high-efficiency evaporating art breading coking chemical waste water of the present invention, comprise preprocessing process, MVR evaporation process process and carrying out washing treatment process, be specially: coking chemical waste water is through softening pre-treatment and entering MVR vaporizer 16 after heat exchange, heated waste water circulation dope in MVR vaporizer 16 is entered by the superheated vapour after vapour compressor 26 compresses, steam condensate after evaporation flows into MVR vaporizer 16 bottom condensate water groove and realizes solid-liquid separation, wherein distilled water reuse, a small amount of concentrated solution is mixed in coal and is burned; Steam is introduced into pickling tower 18, and the ammonia in waste water is absorbed by acid and generates ammonium salt, then enters soda-wash tower 22, and organism wherein, by Alkali absorption, generates Organic Sodium Salt; Steam after carrying out washing treatment enters vapour compressor 26 recycle.
Described preprocessing process is that the calcium in waste water, magnesium and tenderizer react and generate calcium carbonate and magnesium hydroxide flco by adding caustic soda or soda ash softens; Add coagulating agent PAC, PAM again and carry out coagulation, make the solid of generation condense agglomerating together with a large amount of SS, colloid etc. that contain in liquid and grow up, finally in settling tank 4, carry out precipitate and separate.
Through pretreated coking chemical waste water, respectively in dope/wastewater heat exchange device 14, water of condensation/wastewater heat exchange device 11 and vent condenser 13 with dope, water of condensation heat exchange, then mix with the recycling waste water dope in vaporizer 16, and concentrate circulating pump 17 act under in vaporizer 16 circulating and evaporating.
For realizing a kind of device adopting the method for high-efficiency evaporating art breading coking chemical waste water, comprise the pretreatment unit, MVR evaporation process unit and the carrying out washing treatment unit that connect successively, pretreatment unit is made up of equalizing tank 1, mixed flocculation reaction tank 3 and flocculation sedimentation tank 4; MVR evaporation process unit is made up of MVR vaporizer 16 and vapour compressor 26, and carrying out washing treatment unit is located in the steam circuit between MVR vaporizer 16 and vapour compressor 26, is made up of pickling tower 18 and soda-wash tower 22; MVR vaporizer 16 is also provided with concentrate circulating loop.
Described mixed flocculation reaction tank 3 connects caustic soda/soda ash throwing device 8, PAC medicament addition device 7 and PAM medicament addition device 9 in addition; Sewage lagoon 5 is established after flocculation sedimentation tank 4.
Coking chemical waste water pipeline before described MVR vaporizer 16 is provided with water of condensation/wastewater heat exchange device 11, dope/wastewater heat exchange device 14 and vent condenser 13, water of condensation/wastewater heat exchange device 11 supplements mouth with the waste water being connected MVR vaporizer 16 by the waste water tunnel of vent condenser 13 after dope/wastewater heat exchange device 14 parallel connection, and water of condensation/wastewater heat exchange device 11 connects condensation-water drain and the cartridge filter 10 of vent condenser 13 in addition; Dope/wastewater heat exchange device 14 connects dope exhaust and the outlet of outer row's dope of MVR vaporizer 16 in addition.
At the bottom of the tower of described pickling tower 18, discharge port connects ammonium salt reclamation groove 21 in addition, and at the bottom of the tower of soda-wash tower 22, discharge port connects Organic Sodium Salt accumulator tank 25 in addition.
Preprocessing process:
Pretreated object is to prevent MVR vaporizer 16 fouling.Containing a large amount of Ca in coking chemical waste water
2+, Mg
2+, HCO
3-, SS and COD, these are all form the major ingredient of fouling.As coking chemical waste water directly enters MVR vaporizer 16 without any process, serious fouling will certainly be caused, system was lost efficacy in a short period of time.Therefore, water must take corresponding pre-treatment measure before entering MVR vaporizer 16.
The reason that fouling is formed mainly contains following several respects: 1) liquid is due to concentrated and make the material supersaturation that is dissolved in wherein and separate out, as CaSO
4, BaSO
4, SrSO
4, SiO
2and some organism etc.2), in heat-processed, be dissolved in the salts such as the calcium in liquid, magnesium (as bicarbonate salts) and formed due to decomposes and be insoluble in liquid and the salt of separating out from liquid, as CaCO
3, Mg (OH)
2deng.
Preprocessing process principle of work of the present invention: the hardness in coking chemical waste water is based on carbonate hardness, and before entering MVR vaporizer 16, the method that employing caustic soda or soda ash soften is to eliminate the carbonate hardness in water.Meanwhile, add coagulating agent PAC, PAM and carry out coagulation, make the solid of generation condense agglomerating together with a large amount of SS, colloid etc. that contain in liquid and grow up, finally in settling tank 4, be able to precipitate and separate out, the reaction formula that sodium hydroxide softens is as follows:
Ca(HCO
3)
2+2NaOH→CaCO
3+Na2CO
3+2H
2O
Mg(HCO
3)
2+4NaOH→Mg(OH)
2+2Na
2CO
3+2H
2O
By the pretreatment process that softening and coagulating sedimentation combine, greatly can remove calcium, the magnesium ion in coking chemical waste water water, the clearance that clearance reaches more than 90%, COD reaches 20%, SiO
2clearance reach 50%.
MVR evaporation process process:
Through pretreated coking chemical waste water, respectively in dope/wastewater heat exchange device 14, water of condensation/wastewater heat exchange device 11 and vent condenser 13 with dope, water of condensation heat exchange after, through concentrate circulating pump 17 circulating and evaporating in vaporizer 16 after entering MVR vaporizer 16 and mixing in waste water dope.
The steam that MVR vaporizer 16 top is overflowed, from top to down enters acid, caustic scrubber 18,22.Steam by washing water circulation cleaning, after being removed droplet, enters the centrifugal vapour compressor 26 of MVR by the spray catcher that washing tower is built-in in washing tower 18,22.Superheated vapour after compression, after the water of condensation desuperheat humidification of atomized spray, enters heating cycle dope in the heating chamber of MVR vaporizer 6.Steam condensate flows into MVR vaporizer 16 bottom condensate water groove.Water of condensation is sent by condensate pump, a part is as steam attemperation humidification water, a part is as the make up water of washing tower, remainder through in vent condenser 13 and distilled water pump 12 to water of condensation/wastewater heat exchange device 11 with raw material wastewater heat exchange after, enter cartridge filter 10 filter after as product de-salted water (distilled water) reuse.
Carrying out washing treatment process:
Acid cleaning process: the ammonia-nitrogen content of coking chemical waste water is higher, and easily evaporate in the process of evaporation, therefore the present invention is provided with carrying out washing treatment process, steam is by the process of pickling tower 18, ammonium sulfate is generated with strong sulfuric acid response, the ammonia nitrogen of more than 99% is removed, and in distilled water, the concentration of ammonia nitrogen is very low, can guarantee that the ammonia nitrogen concentration of distilled water is up to standard.In acid cleaning process, sulphuric acid soln inside pickling tower 18 is constantly circulated by recycle pump 1, steam enters at the bottom of tower, sulphuric acid soln sprays from tower top, gas-liquid two-phase can obtain abundant mass transfer and heat transfer, in continuous circulation gas scrubbing, ammonium sulfate will reach hypersaturated state and separate out from pickling tower 18; The object that final realization is separated ammonia nitrogen from steam, guarantees that distilled water ammonia nitrogen is up to standard.
Alkaline cleaning procedure: the organism that coking chemical waste water evaporates mainly phenols, carries out direct gas washing with sig water to the steam after overpickling in soda-wash tower 22.In alkaline cleaning procedure, the organism generation chemical reaction in caustic soda and steam generates Organic Sodium Salt, and sig water is constantly circulated by recycle pump 2 23, and when concentration is not enough by external complement.In continuous circulation gas scrubbing, Organic Sodium Salt reaches hypersaturated state and separates out from soda-wash tower 22.Organism in steam is directly removed in alkaline cleaning procedure, and the Organic Sodium Salt of generation is recyclable or mix in coal and burn.、
Soda acid gas scrubbing of the present invention adopts double tower design, automatically controls acid base concentration by on-line detecting system, and absorption reaction is complete, and distilled water (water outlet) quality is high.
A kind of method of high-efficiency evaporating art breading coking chemical waste water and specific embodiment of device of adopting of the present invention is:
1) coking chemical waste water enter equalizing tank 1 carry out volume adjustment and water quality all with, pump in mixed flocculation reaction tank 3 by waste water pump 1;
2) in mixed flocculation reaction tank 3, add caustic soda and carry out sofening treatment, as higher in useless permanent hardness of water, add soda ash; Then polymeric aluminum (PAC) is added and polyacrylamide (PAM) carries out flocculation reaction;
3) waste water enters flocculation sedimentation tank 4 and realizes mud-water separation, make the calcium carbonate of formation, magnesium hydroxide flco from water precipitate and separate out, the waste water after separation enters sewage lagoon 5;
4) coking chemical waste water in sewage lagoon 5 is sent in dope/wastewater heat exchange device 14 and water of condensation/wastewater heat exchange device 11 through waste water pump 26 respectively, in dope/wastewater heat exchange device 14 coking chemical waste water with divide the heat exchange of circulation dope to heat up from MVR vaporizer 16 bottom extraction, in water of condensation/wastewater heat exchange device 11 coking chemical waste water and extract out from MVR vaporizer 16 and through vent condenser 13 condensation distilled water heat exchange and heat up; Enter vent condenser 13 after coking chemical waste water in two interchanger respectively after heat exchange converges, in vent condenser 13, remove the insoluble gas in water, as oxygen and carbonic acid gas; Further heat temperature raising simultaneously;
5) coking chemical waste water after heating up enters in the thickener kerve in MVR vaporizer 16, mix with the dope in thickener internal recycling, then by concentrate circulating pump 17 pump in the top water tank of MVR vaporizer 16 Heat Room, cloth member is divided to flow in heat transfer tube by sewage, be evenly distributed on the inwall of heat transfer tube, drop in film like in grain at the bottom of thickener; When part of contaminated water declines along tube wall, the heat energy of the outer steam release of absorption tube and evaporating, steam drops in grain at the bottom of thickener together with unevaporated sewage;
6) steam in grain at the bottom of thickener enters vapour compressor 26 through carrying out washing treatment unit, and the steam after compression is got back in the thickener of MVR vaporizer 16; At carrying out washing treatment unit, steam is first through pickling tower 18, and pickling tower 18 sprays the ammonia react in sulfuric acid and steam, and generate ammonium sulfate, saturated ammonium sulfate is discharged in ammonium salt reclamation groove 21 by washing liquid pump 1; Steam after pickling enters soda-wash tower 22, and the phenol that soda-wash tower 22 sprays in sodium hydroxide and steam reacts, and generate sodium phenolate, saturated sodium phenolate is discharged in Organic Sodium Salt accumulator tank 25 by washing liquid pump 2 24;
7) in MVR vaporizer 16, the latent heat of compressed vapour passed pipe wall of heat exchange pipe, and the sewage membrane heating lower to the temperature declined along heat transfer tube inwall, makes part of contaminated water evaporate; During compressed vapour release latent heat, heat transfer tube outer wall is condensed into distilled water; Distilled water declines along pipe wall of heat exchange pipe, after gathering, is distilled water pump 12 and extracts out bottom thickener, after vent condenser 13 and water of condensation/wastewater heat exchange device 11, enter cartridge filter 10; When distilled water flows through water of condensation/wastewater heat exchange device 11, carry out heat exchange with the coking chemical waste water newly flowed into;
8) the effluent part concentrated solution in grain at the bottom of MVR vaporizer 16 thickener is drawn pump 15 by dope and is extracted out, heat exchange is carried out through dope/wastewater heat exchange device 14 and the coking chemical waste water newly flowed into, then by outer row's dope outlet drain, this step can the concentration of concentrated solution in control MVR vaporizer 16 thickener;
9) said process constantly circulates, and completes the process of coking chemical waste water.
Following examples are implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention are not limited to following embodiment.In following embodiment, method therefor is ordinary method if no special instructions.
[embodiment]
In the present embodiment, wastewater source is coking chemical waste water, comprising:
1) coking process waste water;
2) the water in water circulating system with water strong brine of discharging through UF-RO treatment unit;
Above two kinds of water enter pretreatment unit after equalizing tank Homogeneous phase mixing.
Coking chemical waste water water examination index sees the following form:
Coking waste water treatment process process is as follows:
1) preprocessing process:
Pre-treatment adopts the processing mode of coagulating sedimentation, forms primarily of mixed reaction pond 3, flocculation sedimentation tank 4, intermediate pool and medicine system.Pretreatment unit structures adopt Steel Concrete to build, and inside do rotproofing.Medicament is accurately added by volume pump.The medicament added comprises sodium hydroxide, PAC, PAM.Added amount of chemical is: NaOH 3000mg/l, PAC1500mg/l, PAM 20mg/l.Employing mechanical stirring mixes, mixing time 20 seconds, mechanic whirl-nett reaction, reaction times 5min.Coagulative precipitation tank 4 adopts vertical sedimentation basin.The settling tank design residence time: 1.5h, surface load: 0.3m
3/ m
2.h.Pipe core velocity in pipes 0.03m/s.
2) MVR evaporation process process:
Evaporation unit is the core of whole Sewage treatment systems, and the removal of most pollutent has been come by this device.The MVR vaporizer 16 of less energy-consumption designs according to the various material characteristic that boiling point is different at the same pressure, the boiling point and evaporating from solution making material reach certain solvent by the mode of heating is separated, according to the characteristic of water corresponding different boiling at various pressures, solution is heated to boiling state water is separated from solution.
In the present embodiment, MVR vaporizer 16 is as follows for the workflow of Treatment of Coking Effluent: through pretreated waste water through over-heat-exchanger with discharge the distilled water of system and dope carries out heat exchange, again through vent condenser 13, finally enter MVR vaporizer 16 main body.The waste water entering MVR vaporizer 16 main body mixes with circulation dope original in main body, and a part of circulation dope is discharged by dope extraction pump 15 simultaneously, and the circulation dope of another part redistributes through liquid distributor and evaporates in each heat transfer tube surface formation film.The hot well that concentrated solution after evaporation converges at bottom part body circulates with newly entering after waste water mixes next time again.The water vapor of evaporation enters pickling tower 18 and soda-wash tower 22, is detached washing unit after gas washing by vapour compressor 26, compresses after intensification, get back to MVR vaporizer 16 through compressor 26.
3) pickling, alkaline cleaning procedure:
In pickling tower 18, volatilize in coking chemical waste water the ammonia nitrogen entered in steam and sulfuric acid reaction, and generate ammonium sulfate, the ammonia nitrogen of more than 99% is removed, and the concentration of distilled water ammonia nitrogen is very low, directly can reach emission request.Steam after pickling gas continues to enter soda-wash tower 22, and the organism in steam and sodium hydroxide reaction, the CODcr of the overwhelming majority is removed.
In the present embodiment, cartridge filter 10 adopts activated carbon filtration.After alkali cleaning gas unit, in steam, the CODcr of the overwhelming majority is removed, and generally distilled water can directly discharge.During in order to ensure system fluctuation, water outlet is unaffected, arranges activated-carbon device as guarantee.At this moment in distilled water, CODcr concentration is lower, and suspended substance is zero substantially, and do not have other poisonous and hazardous materials, applicable activated carbon technology processes.This device is set and can guarantees that water quality reaching standard discharges.
In the present embodiment, the final treatment effect of coking chemical waste water is as follows:
1) steam condenses output accounts for 95% of total sewage quantity; And reach circulating water system water quality requirement:
| PH value | 6.5～9.0 | |
| Turbidity | (degree) | 5 |
| BOD5 | (mg/L) | 10 |
| CODcr | (mg/L) | 30 |
| Iron | (mg/L) | 0.3 |
| Manganese | (mg/L) | 0.2 |
| Muriate | (mg/L) | 250 |
| Total hardness | (in CaCO3 mg/L) | 450 |
| Total alkalinity | (in CaCO3 mg/L) | 350 |
| Ammonia nitrogen | (mg/L) | 10* |
| Total phosphorus (in P) | (mg/L) | 1 |
| Total dissolved solid | (mg/L) | 1000 |
| Free chlorine residual | (mg/L) | End 0.1-0.2 |
| Excrement colibacillus group | (individual/L) | 2000 |
2) mix saline crystallization dope amount and account for total sewage quantity 5%, water ratio 50%max. can mix burning disposal in coal.
Claims (7)
1. one kind adopts the method for high-efficiency evaporating art breading coking chemical waste water, it is characterized in that, comprise preprocessing process, MVR evaporation process process and carrying out washing treatment process, be specially: coking chemical waste water is through softening pre-treatment and entering MVR vaporizer after heat exchange, heated waste water circulation dope in MVR vaporizer is entered by the superheated vapour after vapour compressor compresses, steam condensate after evaporation flows into MVR base of evaporator condensate draining and realizes solid-liquid separation, wherein distilled water reuse, a small amount of concentrated solution is mixed in coal and is burned; Steam is introduced into pickling tower, and the ammonia in waste water is absorbed by acid and generates ammonium salt, then enters soda-wash tower, and organism wherein, by Alkali absorption, generates Organic Sodium Salt; Steam after carrying out washing treatment enters vapour compressor recycle.
2. a kind of method adopting high-efficiency evaporating art breading coking chemical waste water according to claim 1, it is characterized in that, described preprocessing process is that the calcium in waste water, magnesium and tenderizer react and generate calcium carbonate and magnesium hydroxide flco by adding caustic soda or soda ash softens; Add coagulating agent PAC, PAM again and carry out coagulation, make the solid of generation condense agglomerating together with a large amount of SS, colloid etc. that contain in liquid and grow up, finally in settling tank, carry out precipitate and separate.
3. a kind of method adopting high-efficiency evaporating art breading coking chemical waste water according to claim 1, it is characterized in that, through pretreated coking chemical waste water, respectively in dope/wastewater heat exchange device, water of condensation/wastewater heat exchange device and vent condenser with dope, water of condensation heat exchange, then mix with the recycling waste water dope in vaporizer, and under concentrate circulating pumping action in vaporizer circulating and evaporating.
4. for realizing a kind of device adopting the method for high-efficiency evaporating art breading coking chemical waste water according to claim 1, it is characterized in that, comprise the pretreatment unit, MVR evaporation process unit and the carrying out washing treatment unit that connect successively, pretreatment unit is made up of equalizing tank, mixed flocculation reaction tank and flocculation sedimentation tank; MVR evaporation process unit is made up of MVR vaporizer and vapour compressor, and carrying out washing treatment unit is located in the steam circuit between MVR vaporizer and vapour compressor, is made up of pickling tower and soda-wash tower; MVR vaporizer is also provided with concentrate circulating loop.
5. a kind of device adopting high-efficiency evaporating art breading coking chemical waste water according to claim 4, is characterized in that, described mixed flocculation reaction tank connects caustic soda groove, PAC pharmacy slot and PAM pharmacy slot in addition; Sewage lagoon is established after flocculation sedimentation tank.
6. a kind of device adopting high-efficiency evaporating art breading coking chemical waste water according to claim 4, it is characterized in that, coking chemical waste water pipeline before described MVR vaporizer is provided with water of condensation/wastewater heat exchange device, dope/wastewater heat exchange device and vent condenser, water of condensation/wastewater heat exchange device supplements mouth with the waste water that dope/parallel connection of wastewater heat exchange device is connected MVR vaporizer by the waste water tunnel of vent condenser afterwards, and water of condensation/wastewater heat exchange device connects condensation-water drain and the cartridge filter of vent condenser in addition; Dope/wastewater heat exchange device connects dope exhaust and the outlet of outer row's dope of MVR vaporizer in addition.
7. a kind of device adopting high-efficiency evaporating art breading coking chemical waste water according to claim 4, is characterized in that, at the bottom of the tower of described pickling tower, discharge port connects ammonium salt reclamation groove in addition, and at the bottom of the tower of soda-wash tower, discharge port connects Organic Sodium Salt accumulator tank in addition.
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| CN105923868A (en) * | 2016-03-15 | 2016-09-07 | 金能科技股份有限公司 | Coking wastewater depth treatment process and processing system |
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