CN106219652B - High concentration salt manufacturing bittern air-flotation treatment method - Google Patents
High concentration salt manufacturing bittern air-flotation treatment method Download PDFInfo
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- CN106219652B CN106219652B CN201610755639.XA CN201610755639A CN106219652B CN 106219652 B CN106219652 B CN 106219652B CN 201610755639 A CN201610755639 A CN 201610755639A CN 106219652 B CN106219652 B CN 106219652B
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
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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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F2103/08—Seawater, e.g. for desalination
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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
- C02F2303/00—Specific treatment goals
- C02F2303/12—Prevention of foaming
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- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- Inorganic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention belongs to salt manufacturing bittern process fields, and in particular to a kind of high concentration salt manufacturing bittern air-flotation treatment method, including four steps: 1) intaking the dosing stage；2) the coagulation stage；3) the air bearing stage；4) slag, defoaming stage are scraped；Flotation tank contact zone is equipped with micro-hole aerator, micro-hole aerator aperture≤0.1 μm, aeration intensity 1-3Nm in the step 3)3/(m2/ h), aeration zone flow rate of water flow 5-9m/h, time of contact 11-20min；After the completion of air bearing contact, into flotation separation zone, disengaging time 40-75min, dross is collected after floating enters scum trough, and treated, and brine enters air bearing clear water zone；Brine, which flows out to enter by overflow port, in clear water zone produces pond；The pneumatically supported processing method of high concentration salt manufacturing bittern of the present invention can make the floating particle water partial size that produces at 1 to 1.5 μm, and a large amount of colloids, suspended contaminant are effectively removed.The air-flotation treatment method that the present invention uses will not reduce salt manufacturing bittern salinity.
Description
Technical field
The invention belongs to salt manufacturing bittern process fields, and in particular to a kind of high concentration salt manufacturing bittern air-flotation treatment method.
Background technique
Chemical resource rich in brine, salt content are up to 2-6 times of seawater, can be effective by brine air-flotation process
The impurity such as suspended matter colloid in brine are removed, coloration is reduced, water is produced and carries out steaming salt again, product salt quality will be greatly improved.
Air-flotation treatment method has good separating effect for being difficult to the suspended matter of natural subsidence in liquid phase, in many industries
Water process in be widely applied.Air-flotation treatment method is the micro-bubble for forming high degree of dispersion in water, is adhered in water
The solid or liquid particles of hydrophobic group form water-gas-particle three-phase mixed system, after particle adheres to bubble, form apparent density
Less than water wadding body and float to the water surface, formed scum layer be stripped off, to realize the process of solid-liquid or Liquid liquid Separation.
According to generating, bubble mode is unusual to be divided into gas distribution air bearing, electrofloatation, air-dissolving air-float etc. to air flotation technology.Wherein
Micropore gas distribution, dispersion air air bearing belong to gas distribution air bearing, are the air flotation technologies more early applied: its main feature is that in the bottom of flotation tank
Microporous diffuser or diffuser plate, diffuser be set, compressed air from diffuser or plate face, pipe face escaped in the form of micro-bubble in
In water.
The most widely used at present is method of pressed dissolved-air release.Its working principle is that: air pressurized, which is dissolved in water, to be reached
Saturation, the gas being dissolved in water when entering flotation tank after dissolved air water decompression are escaped from water, that is, are released microbubble, claimed pressurization molten
Gas method.Pressure air-dissolving water can be all or part of of handled water, be also possible to the recirculation water of flotation tank water outlet.It pressurizes molten
The equipment of gas method has force (forcing) pump, dissolving and air compressor etc..Dissolving is pressure-bearing steel cylinder, and inside is standing to set deflector or put
Set filler.Dissolving water outlet enters flotation tank by pressure reducing valve or release.Shallow air-floatation is the another way of air-dissolving air-float,
Use is also very extensive at present, and device integrates cohesion, air bearing, skimming, precipitates, scrapes mud, whole cylindrical, pond compared with
Shallowly, for specific gravity close to water small suspended particulate removal, be one of most efficient method.
Partial reflux pressurized dissolved air flotation, shallow air-floatation are most widely used in existing air-float technology, and technical characterstic is distinct,
Advantages, application experience are abundant, but are applied in High Concentration Brine that there are obvious shortcomings.For working as halogen in salt manufacturing bittern
When water Baume degrees is less than 10 ° of B é, release generates the needs that microbubble is still able to satisfy air-float technology；But when brine Baume degrees increases
When to practical 18-24 ° of B é of salt manufacturing bittern Baume degrees, release generates microbubble and sharply reduces, and is unable to satisfy the need of air-float technology
It wants.Trace it to its cause may be in Baume degrees in 18-24 ° of B é high concentration salt manufacturing bittern system, gas-liquid system surface free energy is rapid
So increase, while system can not resist the trend that spontaneous energy itself reduces, gas core self-energy no more than Δ F (air pocket at
Nuclear energy is built), molecular state dissolved gas cannot be precipitated in the form of gas core from liquid phase.
Meanwhile device involved in pressurized dissolved air flotation, shallow air-floatation technique, pipe fitting are more, salt manufacturing bittern salt content is big, right
Water pump, pipeline salt tolerant be corrosion-resistant to be required high, and being applied directly in salt manufacturing bittern processing will increase cost.And conventional diffusion plate,
Bubble size produced by the air bearing mode of the direct gas distribution of diffuser is larger, and energy consumption waste is big, and directly application is then unable to satisfy place
Reason requires.
Summary of the invention
It is an object of the invention to overcome the air-flotation treatment method of the prior art to be difficult to handle the salt manufacturing bittern of high concentration
Defect provides a kind of high concentration salt manufacturing bittern air-flotation treatment method.
To achieve the purpose of the present invention, used technical solution are as follows:
A kind of pneumatically supported processing method of high concentration salt manufacturing bittern, includes the following steps:
1) intake the dosing stage: the salt manufacturing bittern for being 18-24 ° of B é by Baume degrees is entered through water pump lifting by water inlet pipe
Coagulation area, while coagulation area is added by dosing pump in coagulant；
2) the coagulation stage: coagulation stirring is carried out in coagulation area after brine and medicament mixing；It can be by salt manufacturing using the coagulation stage
Suspended matter, colloid etc. are de- surely in brine, are gathered into flocculate, and water outlet enters flotation tank contact zone.
3) the air bearing stage: the water outlet of coagulation area enters flotation tank contact zone, and the flotation tank contact zone is equipped with micro-pore aeration
Device, micro-hole aerator aperture≤0.1 μm, aeration intensity 1-3Nm3/(m2/ h), aeration zone flow rate of water flow 5-9m/h, time of contact
11-20min；After the completion of air bearing contact, into flotation separation zone, disengaging time 40-75min, dross is collected to enter after floating and be floated
Slag chute, treated, and brine enters air bearing clear water zone；Brine, which flows out to enter by overflow port, in clear water zone produces pond；
4) slag, defoaming stage are scraped: generating dross using automatic control transmission slag-scraper and scrapes scum trough, scum period is starting
45s, stops 10min, and dross flow to dross bucket by dreg scraping trough certainly.
Preferably, the coagulant is aluminium polychloride, the dosage of the coagulant are as follows: 0-50ppm；
Preferably, when the dosage of PAC is zero, i.e., when the technology is produced for food salt, in process flow
It is required that forbidding adding chemical agent, dosage is 0ppm in the case of this.At this point, high concentration salt manufacturing bittern in step 1) without
The coagulation stage in step 2), and be directly entered step 3) the air bearing stage, i.e., the high concentration salt manufacturing bittern is directly entered gas
The contact zone Fu Chi, other steps are identical.
When being added with coagulant, it is preferred that in the step 2), the coagulation stage is divided into level Four, and level-one high speed is flocculated
Area revolving speed 200-600r/min, residence time 30-80s, second level flocculation zone revolving speed 40-60r/min, residence time 240-420s,
Three-level flocculation zone revolving speed 10-30r/min, residence time 240-420s, level Four flocculation zone revolving speed 10-30r/min, residence time
240-420s。
Bubble in step 4) in dross carries out spray debubbling method using spray tube and is effectively eliminated, shower water source
In dross collecting pit supernatant.The spray tube is equipped with multiple apertures, and the aperture of the aperture is less than 1mm.
Cleaning pump is equipped on the micro-hole aerator top.
The temperature of high concentration salt manufacturing bittern in step 1) is 25-35 DEG C.
The bottom of the flotation tank contact zone is equipped with micro-hole aerator, the water outlet in coagulation area by flotation tank contact zone bottom
Portion enters flotation tank contact zone.
The micro-hole aerator is multiple groups aeration unit, and the aeration unit includes the center being connected to supply air line
Pipe and the branch pipe equipped with aeration head being connected to the central tube.
Compared with prior art, the beneficial effects of the present invention are:
Since impurity is more in salt manufacturing bittern, particularly with suspended matters such as colloids, traditional sand filtration, beach solarization sedimentation can not
Colloidal impurity is effectively treated.Air flotation technology is applied to the processing of high concentration salt manufacturing bittern by the invention, for
The problems such as high salinity Brine salinity is high, viscosity is big, pressure air-dissolving effect is poor, aperture and aeration intensity to micro-hole aerator,
Aeration zone flow rate of water flow, the conditions such as time of contact are effectively selected.Divided using the micro-hole aerator of micropore≤0.1 μm
Gas is spread, generation micro-bubble effect is fabulous, wadding body, suspended matter in effective adherency, removal salt manufacturing bittern, in High Concentration Brine
Air flotation effect is far superior to pressurized dissolved air flotation under environment.Treated, and brine coloration is substantially reduced, coloration≤25, is subsequent depth
Degree processing lightens the load, meanwhile, brine particle diameter distribution changes, and substantially at 1 to 10 μm, air bearing produces particle water partial size and exists raw water partial size
1 to 1.5 μm, a large amount of colloids, suspended contaminant are effectively removed.The air-flotation treatment method that the present invention uses will not reduce salt manufacturing
Brine salinity.
As it is one such preferably, when the technology is produced for food salt, require in process flow to forbid additionization
Medicament is learned, the additive amount of coagulant is zero at this time.Also attainable brine coloration is substantially reduced, and brine particle diameter distribution significantly subtracts
Few purpose.
In addition, the present invention is for the coagulant and mixing speed in coagulation stage and the water inlet temperature of high concentration salt manufacturing bittern
The selection being optimized is spent, keeps the effect of air bearing impurity elimination more excellent.
The bottom of flotation tank contact zone is arranged in micro-hole aerator simultaneously, while being equipped with multiple aeration heads, can increase exposure
Gas effect.The water outlet in coagulation area enters flotation tank contact zone, the micropore exposure of floccule and bottom by the bottom of flotation tank contact zone
The micro-bubble that gas device generates more fully contacts, and increases aeration effect.
The present invention disperses gas distribution gas floatation process using micro-hole aerator, saves back compared to pressurized dissolved air flotation, shallow air-floatation etc.
The problems such as flowing pump, pipe fitting and valve etc., equipment avoided easily to be corroded by high salinity brine.
The present invention carries out dross defoaming using spraying technique.Due to characteristics, the pole such as salt manufacturing bittern viscosity is high, surface tension is big
Easy to foaming, scum layer can assemble a large amount of bubbles, influence normal use, it is therefore desirable to carry out defoaming treatment.Spray defoaming hydromining
With supernatant in dross collecting pit, fresh water is not used additionally, orifice size≤1mm on spray tube, defoaming effect is good.This patent skill
Art recycles supernatant in dross collecting pit, and circulation carries out scum trough defoaming, improves Brine resources utilization rate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of air-flotation process system of the invention.
In figure: 1, manually-operated gate before intake pump；2, intake pump；3, water inlet manually-operated gate；4, feed water flow meter；5, dosing
Tank；6, dosing pump；7, into medical abortion meter；8, coagulation agitating device；9, coagulation area；10, aeration pump；11, inlet air flow meter；12,
Micro-hole aerator；13, aeration zone evacuation port；14, aerator cleaning pump；15, contact zone of dissolved air flotation；16, flotation separation zone 17, scrape mud
Device；18, scum trough；19, dross collecting pit；20, dross defoams intake pump；21, dross defoams feed water flow meter；22, overflow
Mouthful；23, air bearing clear water zone；24, pond is produced；25, dross defoams spray tube.
Specific embodiment
In order to make those skilled in the art more fully understand technical solution of the present invention, Fig. 1 shows a kind of air bearing
The structural schematic diagram of processing system, specific air-flotation system operational process:
Embodiment 1: it when the technology is produced for food salt, requires to forbid adding chemical agent, this feelings in process flow
The dosage of coagulant is 0ppm under condition.
1) fill phase: opening manually-operated gate 1 before intake pump, the high concentration salt manufacturing bittern temperature for being 18-24 ° of B é by Baume degrees
Degree is heated to 25-35 DEG C of its adaptation range, and subsequently into intake pump 2, opening water inlet manually-operated gate 3 makes salt manufacturing bittern enter gas
Floating contact zone 15, while feed water flow meter 4 monitors flow of inlet water.
2) the air bearing stage: opening aeration pump 10 and inlet air flow meter 11 monitors aeration quantity, and aeration passes through micro-hole aerator
12 enter brine, and wherein micro-hole aerator is multiple groups aeration unit, and the aeration unit includes in being connected to supply air line
Heart pipe and the branch pipe equipped with aeration head being connected to the central tube.The micro-hole aerator setting is contacted in flotation tank
The water outlet of the bottom in area, coagulation area enters flotation tank contact zone by the bottom of flotation tank contact zone.The aperture of aeration head is equal to
0.1 μm, aeration intensity 1Nm3/(m2/ h), aeration zone flow rate of water flow 5m/h, time of contact 11min；A large amount of bubbles enter flotation tank
Wadding body is brought to water surface, after the completion of air bearing contact, into flotation separation zone 16.Air-flotation system produces water and passes through air bearing clear water zone 23
Overflow port 22, into produce pond 24.
4) slag, defoaming stage are scraped: opening mud-scraping apparatus 17, it is starting 45s that its period, which is arranged, stops 10min, by scraping mud dress
The scraper plate installed scrapes water surface surface layer dross into scum trough 18, and dross liquid portion is opened from dross collecting pit 19 is flow to
Dross defoams intake pump 20, and dross defoams feed water flow meter 21 and monitors dross collecting pit to scum trough spray tube inflow, dross
Defoaming 25 lower end of spray tube has several sizes to be less than the hole 1mm, is eliminated bubble in scum trough using spray defoaming by spray tube.
The maintenance of micro-hole aerator periodic cleaning when cleaning, closes intake pump 2, dosing pump 6, coagulation agitating device 8, is then turned on aeration
Pump 10 opens aeration zone evacuation port 13 and empties aeration reaction slot, opens micro-hole aerator 12, aerator cleaning pump 14, carries out clear
It washes.
Embodiment 2 is same as Example 1, and only wherein the aperture of the aeration head in the air bearing stage of step 2) is 0.08 μ
M, aeration intensity 3Nm3/(m2/ h), aeration zone flow rate of water flow 9m/h, time of contact 20min.
Embodiment 3 is same as Example 1, and only wherein micro-hole aerator aperture is equal to 0.1 μ in the air bearing stage of step 2)
M, aeration intensity 2Nm3/(m2/ h), aeration zone flow rate of water flow 7m/h, time of contact 15min.
Embodiment 4:
1) it intakes the dosing stage: opening manually-operated gate 1 before intake pump, the high concentration salt manufacturing halogen for being 18-24 ° of B é by Baume degrees
Coolant-temperature gage is heated to 25-35 DEG C of its adaptation range, subsequently into intake pump 2, open water inlet manually-operated gate 3 make salt manufacturing bittern into
Enter coagulation area 9, while feed water flow meter 4 monitors flow of inlet water.Open dosing pump 6 and into medical abortion meter 7, coagulant polymeric chlorine
Change aluminium and mixed into water inlet line with brine by grug feeding jar 5, control dosage is 50ppm, into coagulation area 9.
2) the coagulation stage: coagulant polymeric aluminium chloride enters coagulation area after mixing with salt manufacturing bittern, is stirred and is filled using coagulation
It sets 8 pairs of mixed liquors to be stirred, level Four speed of agitator is followed successively by 400r/min, 50r/min, 20r/min, 20r/min, and control stops
The time is stayed to be followed successively by 50s, 360s, 360s, 360s, water outlet enters contact zone of dissolved air flotation 15 after stirring, and the coagulation stage can will make
Suspended matter, colloid etc. sweep along into big flocculate in bittern water.
3) the air bearing stage: the water outlet of coagulation area enters contact zone of dissolved air flotation 15, opens aeration pump 10 and inlet air flow meter 11 is supervised
Aeration quantity is surveyed, aeration enters brine by micro-hole aerator 12, and wherein micro-hole aerator is multiple groups aeration unit, the aeration
Unit includes the central tube being connected to supply air line and the branch pipe equipped with aeration head that is connected to the central tube.Described
The bottom of flotation tank contact zone is arranged in micro-hole aerator, and the water outlet in coagulation area enters flotation tank by the bottom of flotation tank contact zone
Contact zone.The hole of aeration head is equal to 0.1 μm, aeration intensity 2Nm3/(m2/ h), aeration zone flow rate of water flow 7m/h, time of contact
15min；A large amount of bubbles enter flotation tank and wadding body are brought to water surface, after the completion of air bearing contact, into flotation separation zone 16.Air bearing
System produces the overflow port 22 that water passes through air bearing clear water zone 23, into production pond 24.
4) slag, defoaming stage are scraped: opening mud-scraping apparatus 17, it is starting 45s that its period, which is arranged, stops 10min, by scraping mud dress
The scraper plate installed scrapes water surface surface layer dross into scum trough 18, and dross liquid portion is opened from dross collecting pit 19 is flow to
Dross defoams intake pump 20, and dross defoams feed water flow meter 21 and monitors dross collecting pit to scum trough spray tube inflow, dross
Defoaming 25 lower end of spray tube has several sizes to be less than the hole 1mm, is eliminated bubble in scum trough using spray defoaming by spray tube.
The maintenance of micro-hole aerator periodic cleaning when cleaning, closes intake pump 2, dosing pump 6, coagulation agitating device 8, is then turned on aeration
Pump 10 opens aeration zone evacuation port 13 and empties aeration reaction slot, opens micro-hole aerator 12, aerator cleaning pump 14, carries out clear
It washes.
Embodiment 5 is same as Example 4, only the wherein level Four speed of agitator 200r/min in step 2) the coagulation stage,
40r/min, 10r/min, 10r/min, control residence time are followed successively by 30s, 240s, 240s, 240s.The air bearing stage of step 3)
In aeration head aperture be 0.08 μm, aeration intensity 3Nm3/(m2/ h), aeration zone flow rate of water flow 9m/h, time of contact 20min；
Embodiment 6 is same as Example 1, and only wherein level Four speed of agitator is followed successively by 600r/ in step 2) the coagulation stage
Min, 60r/min, 30r/min, 30r/min, control residence time are followed successively by 80s, 420s, 420s, 420s, the air bearing of step 3)
Micro-hole aerator aperture is equal to 0.1 μm in stage, aeration intensity 1Nm3/(m2/ h), aeration zone flow rate of water flow 5m/h, time of contact
11min。
Embodiment 1-6 can obtain the implementation purpose of the present embodiment, i.e., treated, and brine coloration is substantially reduced, and coloration≤
25, it lightens the load for successive depths processing, meanwhile, brine particle diameter distribution changes, and substantially at 1 to 10 μm, air bearing produces raw water partial size
At 1 to 1.5 μm, a large amount of colloids, suspended contaminant are effectively removed particle water partial size.The air-flotation treatment method that the present invention uses
Salt manufacturing bittern salinity will not be reduced.
Below with reference to most preferred embodiment 3,4, the present invention is described in further detail.
In August, 2015-October carries out the demonstration research of 100 ton per days in Tianjin.
Demonstration research effect:
1: air-flotation system water inlet produces the test of colority of water removal effect: sampling Detection, 2 results of grab sample such as table 1 show
Out.Table 1 shows air-flotation system production colority of water and is decreased obviously, and chroma removal rate can reach 30% or more, wherein after addition coagulant
Chroma removal rate increases, but it is not apparent for increasing.
Table 1
2: the test of brine Baume degrees:
Into, produce water Baume degrees 18-24 ° of B é high concentration salt manufacturing clear water air-flotation system into, produce ripples U.S. angle value sampling inspection
It surveys.Table 2 shows that air-flotation system processing mode will not reduce salt manufacturing bittern Baume angle value.
Table 2
| Date | It intakes (Baume degrees) | It produces water (Baume degrees) | Embodiment |
| 8.7 | 18 | 18 | 3# |
| 8.11 | 18 | 18 | 4# |
| 8.18 | 19 | 19 | 3# |
| 8.22 | 19 | 19 | 4# |
| 8.25 | 18 | 18 | 3# |
| 8.30 | 24 | 24 | 4# |
| 9.3 | 18 | 18 | 3# |
| 9.7 | 20 | 20 | 4# |
| 9.11 | 19 | 19 | 3# |
| 9.13 | 20 | 20 | 4# |
| 9.19 | 19 | 19 | 3# |
| 9.26 | 24 | 24 | 4# |
| 9.27 | 18 | 18 | 3# |
| 9.29 | 23 | 23 | 4# |
3. particle diameter distribution is tested:
To raw water, be embodiment 3,4 air-flotation systems produce water carry out particle diameter distribution detection, to characterize system to colloidal solid object
Removal effect.Air-flotation system raw water partial size substantially at 1-10 μm, air-flotation system produce water particle diameter be largely distributed in 1.2 μm with
Under, based on 1 μm or so of little particle, average grain diameter is also declined, and illustrates that air-flotation system has effectively removed a large amount of colloids.
Since impurity is more in salt manufacturing bittern, particularly with suspended matters such as colloids, traditional sand filtration, beach solarization sedimentation can not
Colloidal impurity is effectively treated.Air flotation technology is applied to the processing of high concentration salt manufacturing bittern by the invention, for
The problems such as high salinity Brine salinity is high, viscosity is big, pressure air-dissolving effect is poor, aperture and aeration intensity to micro-hole aerator,
Aeration zone flow rate of water flow, the conditions such as time of contact are effectively selected.Dispersed using micropore≤0.1 μm micro-hole aerator
Gas distribution, generation micro-bubble effect is fabulous, wadding body, suspended matter in effective adherency, removal salt manufacturing bittern, in High Concentration Brine ring
Air flotation effect is far superior to pressurized dissolved air flotation under border.Treated, and brine coloration is substantially reduced, coloration≤25, is successive depths
Processing lightens the load, meanwhile, brine particle diameter distribution changes, and for raw water partial size substantially at 1 to 10 μm, air bearing produces particle water partial size 1
To 1.5 μm, a large amount of colloids, suspended contaminant are effectively removed.The air-flotation treatment method that the present invention uses will not reduce salt manufacturing
Brine salinity.
In addition, the present invention is for the coagulant and mixing speed in coagulation stage and the water inlet temperature of high concentration salt manufacturing bittern
The selection being optimized is spent, keeps the effect of air bearing impurity elimination more excellent.
The bottom of flotation tank contact zone is arranged in micro-hole aerator simultaneously, while being equipped with multiple aeration heads, can increase exposure
Gas effect.The water outlet in coagulation area enters flotation tank contact zone by the bottom of flotation tank contact zone, and brine injects from bottom to top, herein
In the process, the brine in pond, which goes to generate to shake, can make floccule and the micro-bubble of the micro-hole aerator of bottom generation more abundant
Contact, increase aeration effect.
The present invention disperses gas distribution gas floatation process using micro-hole aerator, saves back compared to pressurized dissolved air flotation, shallow air-floatation etc.
The problems such as flowing pump, pipe fitting and valve etc., equipment avoided easily to be corroded by high salinity brine.
The present invention carries out dross defoaming using spraying technique.Due to characteristics, the pole such as salt manufacturing bittern viscosity is high, surface tension is big
Easy to foaming, scum layer can assemble a large amount of bubbles, influence normal use, it is therefore desirable to carry out defoaming treatment.Spray defoaming hydromining
With supernatant in dross collecting pit, fresh water is not used additionally, orifice size 1mm on spray tube, defoaming effect is good.The art of this patent
Supernatant in dross collecting pit is recycled, circulation carries out scum trough defoaming, improves Brine resources utilization rate.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of high concentration salt manufacturing bittern air-flotation treatment method, which is characterized in that include the following steps:
1) intake the dosing stage: by Baume degrees be 18-24 ° of B é high concentration salt manufacturing bittern, through water pump lifting by water inlet pipe into
Enter coagulation area, while coagulation area is added by dosing pump in coagulant；
2) the coagulation stage: coagulation stirring is carried out in coagulation area after brine and medicament mixing；It can be by salt manufacturing bittern using the coagulation stage
Middle suspended matter, elimination of colloid stability are gathered into flocculate, and water outlet enters flotation tank contact zone；
3) the air bearing stage: the water outlet of coagulation area enters flotation tank contact zone, and the flotation tank contact zone is equipped with micro-hole aerator, micro-
Hole aerator aperture≤0.1 μm, aeration intensity 1-3Nm3/(m2/ h), aeration zone flow rate of water flow 5-9m/h, time of contact 11-
20min；After the completion of air bearing contact, into flotation separation zone, disengaging time 40-75min, dross is collected after floating enters dross
Slot, treated, and brine enters air bearing clear water zone；Brine, which flows out to enter by overflow port, in clear water zone produces pond；
4) slag, defoaming stage to be scraped: generating dross using automatic control transmission slag-scraper and scrapes scum trough, scum period is starting 45s,
Stop 10min, dross flow to dross bucket by dreg scraping trough certainly.
2. high concentration salt manufacturing bittern air-flotation treatment method according to claim 1, which is characterized in that the coagulant is
Aluminium polychloride, the dosage of the coagulant are as follows: 0-50ppm；Height when the dosage of PAC is zero, in step 1)
Concentration salt manufacturing bittern is directly entered step 3) the air bearing stage without the coagulation stage in step 2), other steps are identical.
3. high concentration salt manufacturing bittern air-flotation treatment method according to claim 1, which is characterized in that the step 2)
In, the coagulation stage is divided into level Four, level-one high speed flocculation zone revolving speed 200-600r/min, residence time 30-80s, second level flocculation zone
Revolving speed 40-60r/min, residence time 240-420s, three-level flocculation zone revolving speed 10-30r/min, residence time 240-420s, four
Grade flocculation zone revolving speed 10-30r/min, residence time 240-420s.
4. high concentration salt manufacturing bittern air-flotation treatment method according to claim 1, which is characterized in that in step 4) in dross
Bubble using spray tube carry out spray debubbling method effectively eliminated, shower water derive from dross collecting pit supernatant.
5. high concentration salt manufacturing bittern air-flotation treatment method according to claim 4, which is characterized in that on the spray tube
Equipped with multiple apertures, the aperture of the aperture is less than 1mm.
6. high concentration salt manufacturing bittern air-flotation treatment method according to claim 1, which is characterized in that exposed in the micropore
Gas device top is equipped with cleaning pump.
7. high concentration salt manufacturing bittern air-flotation treatment method according to claim 1, which is characterized in that highly concentrated in step 1)
The temperature for spending salt manufacturing bittern is 25-35 DEG C.
8. high concentration salt manufacturing bittern air-flotation treatment method according to claim 1, which is characterized in that the flotation tank connects
The bottom for touching area is equipped with micro-hole aerator, and the water outlet in coagulation area enters flotation tank contact zone by the bottom of flotation tank contact zone.
9. high concentration salt manufacturing bittern air-flotation treatment method according to claim 1, which is characterized in that the micro-pore aeration
Device is aeration unit, and the aeration unit includes the central tube being connected to supply air line and is connected to the central tube
A plurality of branch pipe equipped with aeration head.
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| US20200354241A1 (en) * | 2019-05-10 | 2020-11-12 | Sugino Machine Limited | Liquid treatment apparatus and liquid treatment method |
| CN113501606A (en) * | 2021-06-25 | 2021-10-15 | 天津长芦汉沽盐场有限责任公司 | Saturated brine purification method |
| CN116040656A (en) * | 2022-12-14 | 2023-05-02 | 中盐金坛盐化有限责任公司 | Method and device for removing organic matters in brine |
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| US8597521B1 (en) * | 2009-06-24 | 2013-12-03 | Simbol Inc. | Selective removal of silica from silica containing brines |
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| US8597521B1 (en) * | 2009-06-24 | 2013-12-03 | Simbol Inc. | Selective removal of silica from silica containing brines |
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