CN105923861A - Method for efficiently treating alkaline washing wastewater - Google Patents
Method for efficiently treating alkaline washing wastewater Download PDFInfo
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- CN105923861A CN105923861A CN201610304233.XA CN201610304233A CN105923861A CN 105923861 A CN105923861 A CN 105923861A CN 201610304233 A CN201610304233 A CN 201610304233A CN 105923861 A CN105923861 A CN 105923861A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a method for efficiently treating alkaline washing wastewater. The method includes the steps that raw alkaline washing wastewater enters a neutralization unit, a demulsification unit, a coagulating sedimentation unit, a photocatalysis unit, a deep coagulating sedimentation unit and the like in sequence, is treated through a decoloration unit and is drained from a water outlet finally, sludge generated in demulsification and coagulating sedimentation is collected, dewatered through a sludge dewatering machine and then conveyed out, and dewatering supernatant liquid flows back to the neutralization unit. Compared with the prior art, the method has the advantages that pollutants can be efficiently removed, an adopted equipment system is simple, and operation is stable.
Description
Technical field
The present invention relates to sewage treatment area, a kind of method especially relating to efficient process alkali-wash waste water.
Background technology
Chemical cleaning is a kind of process chemically removing impurity and make that object is clean, and it is one and relates to model
Enclose widely and the abundantest engineering of content.Chemical cleaning makes to be cleaned by by the effect of chemical agent
Deposit in equipment dissolves, loosens, comes off or peels off, and has in industrial circle particularly oil and chemical industry
Universal application.According to incompletely statistics, by 2015, domestic existing tens thousand of cleaning work companies, its
In in the majority with Shanghai, Guangzhou, Beijing, Shenzhen, Xi'an, Lanzhou and other places, practitioner reaches about 1,000,000 people,
Rank among the prostatitis of big service occupation of China ten.Clean range, also by single cleaning boiler, expands to oil, change
The all trades and professions such as work, electric power, machinery, coal, civic building.Chemical cleaning as a field of scientific study and
One engineering, plays an important role in daily life and commercial production.The final purpose of Chemical cleaning
It is to reduce economic loss, to obtain bigger economic benefit.Process of Chemical Cleaning can be divided into pickling, alkali cleaning and passivation
Etc. several key steps, create pickling waste waters, alkali-wash waste water and passivating wastewater etc. accordingly.
Alkali cleaning is using the chemical agent of strong basicity or alkalescence as abluent, adds surfactant wetting removal simultaneously
Oils and fats, dust and biological substance, to improve cleaning performance.Alkali cleaning is usually used in: remove system or not standby in oils and fats
With the chip left over when installing；Clean with acid and be used alternatingly, clean and be difficult to remove removing the acid such as such as silicate
Deposit；After alkali cleaning is also used for acid cleaning, to neutralize in water or the acid of residual in equipment, reduce its corrosivity.
The purpose of alkali cleaning is to remove newly-built equipment or device manufacturing, storing and produced various machineries in installation process
The greasy dirts such as oil, graphite grease, antirust oil, dirty (such as sulfate, silicate to some indissoluble of in-service equipment or device
Dirt) conversion etc..And according to different cleaning objects and requirement, in cleanout fluid, also comprise the alkali of 0.5-8%
Property salt, the surfactant of 0-0.5%.Therefore the feature that alkali-wash waste water has complicated component, intractability is big,
Wherein oil pollutant is the main cause causing COD value high, is also the difficult point of alkali-wash waste water process.
Owing to chemical cleaning technology is interim one-shot job, equipment only cleans 1-2 time for usual 1 year, and therefore one
Therefore and specially a little enterprises will not build and process the facility cleaning waste water, but take the form of outsourcing, transfer to clean
Company processes.And clean company's form with field operation, mutually neutralize with pickling waste waters frequently with alkali-wash waste water
Or the method that dosing neutralizes, adds some water treatment agents or environment-friendly type neutral cleaners etc. after the neutralization and locates
Just discharging water body after reason, the most special cleaning device processes.Poisonous and harmful for containing in waste water becomes
Dividing the method taking dilution, pollutant actually are the most really removed.Even if some existing degree of treatments are more
In the cleaning waste water comprehensive processing technique of specification, there is also the phenomenon that treatment effeciency is low, cycle length, water quality are the most up to standard.
At alkali-wash waste water independent process technical elements, there is no relevant report the most especially.Owing to the process of alkali-wash waste water is current
It is formed without a set of maturation and perfect system for handling so that waste water is unable to reach discharging standards (GB8978)
And directly discharge, need to carry out the process of system.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and provide one efficiently to process alkali
The method washing waste water.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of method of efficient process alkali-wash waste water, comprises the following steps:
A () neutralizes: collect pending alkali-wash waste water, sends into neutralisation unit, adds the first nertralizer regulation pH
To 6-9；
(b) breakdown of emulsion: the waste water after step (a) being neutralized is sent in breakdown of emulsion unit, adds demulsifier, stirs shape
Becoming mud, solid-liquid separation, mud sends into storage mud unit；
(c) coagulating sedimentation: in the waste water of solid-liquid separation sends into coagulating sedimentation unit after breakdown of emulsion in step (b),
Add coagulant, quickly stir, add the first flocculant, low rate mixing, solid-liquid separation, produce mud and introduce
Storage mud unit；
(d) photochemical catalytic oxidation: the waste water of solid-liquid separation after coagulating sedimentation in step (c) is added photocatalysis unit
In, add oxidant, stirring reaction；
(e) degree of depth coagulating sedimentation: waste water after photochemical catalytic oxidation in step (d) is added degree of depth coagulation unit
After, add the second nertralizer regulation pH to 9-12, add the second flocculant, low rate mixing, solid-liquid separation, dirt
Mud sends into storage mud unit；
F () is decoloured: joined by the waste water of solid-liquid separation after degree of depth coagulating sedimentation in step (e) in decolouring unit,
Add decolorising agent, stirring reaction, i.e. obtain after reaction discharging water outlet；
G () Treatment of Sludge: the mud collected in storage mud unit introduces in dewatering unit, dehydration, supernatant refluxes
To neutralisation unit, the mud outward transport after dehydration is disposed.
The first nertralizer described in step (a) is hydrochloric acid or sulphuric acid.
Demulsifier described in step (b) is in aluminium salt, magnesium salt, calcium salt, iron salt, surfactant or Bentonite
At least one, it adds concentration is 5-200g/L.
In step (b), stirring is: first stirs 0.5-3min with 100-300rpm, stirs with 20-80rpm subsequently
5-30min。
Coagulant described in step (c) is aluminium polychlorid, poly-ferric chloride, PAFC, polymerization
At least one in iron sulfate, polyaluminium sulfate, polymeric aluminium ferrum silicate, ferric chloride or aluminum sulfate, it adds dense
Degree is 5-100g/L；
The first described flocculant is surfactant or macromolecule flocculation aid, and it adds concentration is 10-200mg/L.
Can be cationic, anionic and non-ionic polyacrylamide.
In step (c), quickly stirring is to stir 0.5-3min at 100-300rpm；
Low rate mixing is to stir 5-30min at 20-80rpm.
In step (d): described oxidant is hydrogen peroxide, ozone or sodium hypochlorite, it adds concentration is 1-30g/L；
Stirring reaction is: stir 0.5-5h under 100-300rpm.
In step (e): the second described nertralizer is sodium hydroxide or potassium hydroxide；
The second described flocculant is surfactant or macromolecule flocculation aid, can be polyacrylamide, and it adds
Concentration is 5-100mg/L；
In step (e), low rate mixing is: stir 10-40min under 20-80rpm.
In step (f): described decolorising agent is strong oxidizer, it adds concentration is 3-100g/L；
Stirring reaction time be: under 100-500rpm stir 0.5-5h.
Alkali-wash waste water first passes through neutralisation unit regulation pH value of waste water to reduce corrosion to equipment, passes through afterwards
Breakdown of emulsion unit can effectively remove the material suppressing coagulating sedimentation in follow-up coagulating treatment, and promotes coagulating sedimentation unit
Efficient removal to materials such as petroleum ether.Waste water adds coagulating sedimentation unit makes organic principle in water occur with coagulant
Reacting and pass through flocculation and removed from waste water by pollutant, after reaction completely, COD value and the turbidity of waste water are bright
Aobvious reduction, is favorably improved the generation efficiency of subsequent optical catalytic oxidation unit hydroxyl radical free radical, prevents from being catalyzed light source
Pollute.Owing to photocatalytic reaction unit can cause wastewater pH to decline, in needing first before degree of depth coagulating sedimentation unit
And waste water, and remove remaining Organic substance and float in waste water further by degree of depth coagulating sedimentation.Degree of depth coagulation
Precipitation unit delivery turbidity is relatively low but still has color, need to by decolour unit the further clarification and effluent of strong oxidizer,
And reduce water outlet COD.Additionally, the dirt that breakdown of emulsion unit, coagulating sedimentation unit and degree of depth coagulating sedimentation unit generate
Mud needs dewatered sludge outward transport to dispose, and supernatant is then back to neutralization pond unit.
Compared with prior art, the present invention defines the industrial alkali cleaning waste water treatment process of complete set.This technique
By pretreatment (neutralizing and breakdown of emulsion), bulk processing (coagulating sedimentation) and precision processing, (photochemical catalytic oxidation, the degree of depth are mixed
Solidifying and decolouring) organic assembling of unit, not only achieve pollutant efficiently removes (COD and turbidity removal rate
It is respectively higher than 98% and 99%), and by the combination of each unit, mutual supplement with each other's advantages, it is ensured that system stability is transported
OK.
Accompanying drawing explanation
Fig. 1 is alkali-wash waste water process chart of the present invention；
In figure, 1-neutralisation unit, 2-breakdown of emulsion unit, 3-coagulating sedimentation unit, 4-photochemical catalytic oxidation unit, 5-is deep
Degree coagulating sedimentation unit, 6-decolours unit, and 7-stores mud unit, 8-dewatering unit, and the former water of A-alkali-wash waste water, B-goes out
Water, C-supernatant liquid from sludge dehydration, D-breakdown of emulsion mud, E-coagulated sludge, F-degree of depth coagulated sludge, G-is dehydrated
Mud.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As it is shown in figure 1, comprising the following steps that of alkali-wash waste water, former for alkali-wash waste water water A is added neutralisation unit 1,
Add the first nertralizer regulation pH.Waste water enters breakdown of emulsion unit 2 afterwards, adds demulsifier and is stirred, breakdown of emulsion
After the breakdown of emulsion mud D of rear formation separates with waste water solid, scrape to mud-collecting slot with slag scraper, and certainly flow to mud storage pool 7
In.Waste water after solid-liquid separation enters coagulating sedimentation unit 3, adds coagulant, quickly stirs, and is subsequently added the
One flocculant, low rate mixing.Introduce after coagulated sludge E after solid-liquid separation is concentrated bottom sedimentation tank
Mud storage pool 7.Waste water after solid-liquid separation enters in photochemical catalytic oxidation unit 4, adds oxidant, stirring.Reaction
Rear waste water enters degree of depth coagulating sedimentation unit 5, after adding the second nertralizer regulation pH, adds the second flocculant,
Low rate mixing.Storage is introduced after being concentrated bottom sedimentation tank by the degree of depth coagulated sludge F produced after solid-liquid separation
Mud sump 7.Waste water after solid-liquid separation enters in decolouring unit 6, adds decolorising agent, stirring, after having reacted i.e.
Available water outlet B.The mud collected in storage mud unit 7 is introduced dewatering unit 8, and supernatant liquid from sludge dehydration C is back to
Neutralisation unit 1, dewatered sludge G transports outward disposal.
Embodiment 2
Utilize the alkali-wash waste water processing technological flow described in embodiment 1, the rustless steel alkali-wash waste water of certain factory is carried out
Utilizing this method to carry out the experiment processed, concrete operation step is as follows.
(1) neutralize: former for the alkali-wash waste water after defat water A is added neutralisation unit 1, according to pH value of waste water,
Add hydrochloric acid by the range of its pH regulator to 6-9.
(2) breakdown of emulsion: join in breakdown of emulsion unit 2 by waste water described in step (1), adds 200g/L breakdown of emulsion
0.5min, 50rpm low rate mixing 15min is quickly stirred in agent with 100rpm, the Mud up-floating formed after breakdown of emulsion.
After the breakdown of emulsion mud D floated separates with waste water solid, scrape to mud-collecting slot with slag scraper, and certainly flow to mud storage pool 7
In.The demulsifier that this stage uses is that aluminium polychlorid, anion-polyacrylamide surfactant are with 4:1's
Mass ratio is used in mixed way.
(3) coagulating sedimentation: the waste water after step (2) solid-liquid separation is added in coagulating sedimentation unit 3, add
5g/L coagulant (PAFC, bodied ferric sulfate 4:1 in mass ratio is used in mixed way), stirs with 250rpm
2min, is subsequently added 10mg/L anion-polyacrylamide, stirs 10min with 40rpm.After solid-liquid separation,
Coagulated sludge E introduces mud storage pool 7 after concentrating bottom sedimentation tank.
(4) photochemical catalytic oxidation: the waste water after step (3) solid-liquid separation is joined photochemical catalytic oxidation unit 4
In, add 10g/L sodium hypochlorite, stir 2h with 200rpm.
(5) degree of depth coagulating sedimentation: after step (4) being reacted, waste water adds degree of depth coagulating sedimentation unit 5, adds
After sodium hydroxide regulation pH value is 9-12, adds anion-polyacrylamide 10mg/L, stir with 40rpm.
After solid-liquid separation, the degree of depth coagulated sludge F of generation introduces mud storage pool 7 after concentrating bottom sedimentation tank.
(6) decolouring: the waste water after step (5) solid-liquid separation is joined in decolouring unit 6, add 3g/L
Hydrogen peroxide, stirs 1h with 350rpm.
(7) Treatment of Sludge: the mud collected in storage mud unit 7 is introduced dewatering unit 8, supernatant liquid from sludge dehydration C
Being back to neutralisation unit 1, dewatered sludge G transports outward disposal.
The alkali-wash waste water using the present embodiment processes the water quality clarification after PROCESS FOR TREATMENT, and the cycle that water processes is short, pH
It is down to 7.2 by 13.32；COD is down to 90mg/L by 9440mg/L, and clearance reaches 99.0%；Turbidity is by 634NTU
Being down to 0.6NTU, clearance reaches 99.9%.And technological process is simple and easy to operate, adding of agent low cost.Overcome
Alkali-wash waste water is processed and is difficult to defect up to standard by currently available technology.
Embodiment 3
Utilize the alkali-wash waste water processing technological flow described in embodiment 1, the rustless steel alkali-wash waste water of certain factory is carried out
Utilizing this method to carry out the experiment processed, concrete operation step is as follows.
(1) neutralize: former for the alkali-wash waste water after defat water A is added neutralisation unit 1, according to pH value of waste water,
Add hydrochloric acid by its pH regulator to about 7.
(2) breakdown of emulsion: join in breakdown of emulsion unit 2 by waste water described in step (1), adds 5g/L demulsifier
0.5min, 20rpm low rate mixing 30min is quickly stirred, the Mud up-floating formed after breakdown of emulsion with 300rpm.On
After floating breakdown of emulsion mud D separates with waste water solid, scrape to mud-collecting slot with slag scraper, and certainly flow in mud storage pool 7.
The demulsifier that this stage uses is that magnesium hydroxide, iron chloride are used in mixed way with the mass ratio of 1:1.
(3) coagulating sedimentation: the waste water after step (2) solid-liquid separation is added in coagulating sedimentation unit 3, add
5g/L coagulant (aluminium polychlorid and poly-ferric chloride 2:1 in mass ratio is used in mixed way), stirs with 300rpm
0.5min, is subsequently added 10mg/L non-ionic polyacrylamide, stirs 5min with 80rpm.After solid-liquid separation,
Coagulated sludge E introduces mud storage pool 7 after concentrating bottom sedimentation tank.
(4) photochemical catalytic oxidation: the waste water after step (3) solid-liquid separation is joined photochemical catalytic oxidation unit 4
In, add 30g/L hydrogen peroxide, stir 0.5h with 300rpm.
(5) degree of depth coagulating sedimentation: after step (4) being reacted, waste water adds degree of depth coagulating sedimentation unit 5, adds
After potassium hydroxide regulation pH value is 10, adds non-ionic polyacrylamide 100mg/L, stir with 80rpm
15min.After solid-liquid separation, the degree of depth coagulated sludge F of generation introduces mud storage pool after concentrating bottom sedimentation tank
7。
(6) decolouring: the waste water after step (5) solid-liquid separation is joined in decolouring unit 6, add 10g/L
Hydrogen peroxide, stirs 5h with 100rpm.
(7) Treatment of Sludge: the mud collected in storage mud unit 7 is introduced dewatering unit 8, supernatant liquid from sludge dehydration C
Being back to neutralisation unit 1, dewatered sludge G transports outward disposal.
The alkali-wash waste water using the present embodiment processes the water quality clarification after PROCESS FOR TREATMENT, and the cycle that water processes is short, pH
It is down to 6.8 by 13.54；COD is down to 60mg/L by 6552mg/L, and clearance reaches 99.1%；Turbidity is by 655NTU
Being down to 0.5NTU, clearance reaches 99.9%.And technological process is simple and easy to operate, adding of agent low cost.Overcome
Alkali-wash waste water is processed and is difficult to defect up to standard by currently available technology.
Embodiment 4
Utilize the alkali-wash waste water processing technological flow described in embodiment 1, the rustless steel alkali-wash waste water of certain factory is carried out
Utilizing this method to carry out the experiment processed, concrete operation step is as follows.
(1) neutralize: former for the alkali-wash waste water after defat water A is added neutralisation unit 1, according to pH value of waste water,
Add hydrochloric acid by its pH regulator to about 9.
(2) breakdown of emulsion: join in breakdown of emulsion unit 2 by waste water described in step (1), adds 200g/L breakdown of emulsion
3min, 80rpm low rate mixing 5min is quickly stirred in agent with 100rpm, the Mud up-floating formed after breakdown of emulsion.On
After floating breakdown of emulsion mud D separates with waste water solid, scrape to mud-collecting slot with slag scraper, and certainly flow in mud storage pool 7.
The demulsifier that this stage uses is that calcium chloride, Bentonite are used in mixed way with the mass ratio of 3:1.
(3) coagulating sedimentation: the waste water after step (2) solid-liquid separation is added in coagulating sedimentation unit 3, add
100g/L coagulant (ferric chloride, aluminum sulfate 1:1 in mass ratio is used in mixed way), stirs 0.5min with 300rpm,
It is subsequently added 200mg/L non-ionic polyacrylamide, stirs 30min with 20rpm.After solid-liquid separation, mixed
Solidifying precipitating sludge E introduces mud storage pool 7 after concentrating bottom sedimentation tank.
(4) photochemical catalytic oxidation: the waste water after step (3) solid-liquid separation is joined photochemical catalytic oxidation unit 4
In, add 1g/L ozone, stir 5h with 100rpm.
(5) degree of depth coagulating sedimentation: after step (4) being reacted, waste water adds degree of depth coagulating sedimentation unit 5, adds
After sodium hydroxide regulation pH value is 12, adds non-ionic polyacrylamide 5mg/L, stir with 80rpm
10min.After solid-liquid separation, the degree of depth coagulated sludge F of generation introduces mud storage pool after concentrating bottom sedimentation tank
7。
(6) decolouring: the waste water after step (5) solid-liquid separation is joined in decolouring unit 6, add 100g/L
Hydrogen peroxide, stirs 0.5h with 500rpm.
(7) Treatment of Sludge: the mud collected in storage mud unit 7 is introduced dewatering unit 8, supernatant liquid from sludge dehydration C
Being back to neutralisation unit 1, dewatered sludge G transports outward disposal.
The alkali-wash waste water using the present embodiment processes the water quality clarification after PROCESS FOR TREATMENT, and the cycle that water processes is short, pH
It is down to 7.1 by 12.74；COD is down to 77mg/L by 8232mg/L, and clearance reaches 99.1%；Turbidity is by 574NTU
Being down to 0.8NTU, clearance reaches 99.9%.And technological process is simple and easy to operate, adding of agent low cost.Overcome
Alkali-wash waste water is processed and is difficult to defect up to standard by currently available technology.
Embodiment 5
Utilize the alkali-wash waste water processing technological flow described in embodiment 1, the rustless steel alkali-wash waste water of certain factory is carried out
Utilizing this method to carry out the experiment processed, concrete operation step is as follows.
(1) neutralize: former for the alkali-wash waste water after defat water A is added neutralisation unit 1, according to pH value of waste water,
Add hydrochloric acid by its pH regulator to about 6.
(2) breakdown of emulsion: join in breakdown of emulsion unit 2 by waste water described in step (1), adds 100g/L breakdown of emulsion
2.5min, 60rpm low rate mixing 15min is quickly stirred in agent with 200rpm, the Mud up-floating formed after breakdown of emulsion.
After the breakdown of emulsion mud D floated separates with waste water solid, scrape to mud-collecting slot with slag scraper, and certainly flow to mud storage pool 7
In.The demulsifier that this stage uses is non-ionic polyacrylamide.
(3) coagulating sedimentation: the waste water after step (2) solid-liquid separation is added in coagulating sedimentation unit 3, add
50g/L coagulant (polyaluminium sulfate), stirs 3min with 100rpm, is subsequently added 80mg/L anionic and gathers
Acrylamide, stirs 25min with 50rpm.After solid-liquid separation, coagulated sludge E concentrates bottom sedimentation tank
Rear introducing mud storage pool 7.
(4) photochemical catalytic oxidation: the waste water after step (3) solid-liquid separation is joined photochemical catalytic oxidation unit 4
In, add 12g/L sodium hypochlorite, stir 2h with 200rpm.
(5) degree of depth coagulating sedimentation: after step (4) being reacted, waste water adds degree of depth coagulating sedimentation unit 5, adds
After potassium hydroxide regulation pH value is 9, adds anion-polyacrylamide 40mg/L, stir 40min with 50pm.
After solid-liquid separation, the degree of depth coagulated sludge F of generation introduces mud storage pool 7 after concentrating bottom sedimentation tank.
(6) decolouring: the waste water after step (5) solid-liquid separation is joined in decolouring unit 6, add 40g/L
Hydrogen peroxide, stirs 1.5h with 400rpm.
(7) Treatment of Sludge: the mud collected in storage mud unit 7 is introduced dewatering unit 8, supernatant liquid from sludge dehydration C
Being back to neutralisation unit 1, dewatered sludge G transports outward disposal.
The alkali-wash waste water using the present embodiment processes the water quality clarification after PROCESS FOR TREATMENT, and the cycle that water processes is short, pH
It is down to 6.8 by 12.30；COD is down to 59mg/L by 7251mg/L, and clearance reaches 99.2%；Turbidity is by 672NTU
Being down to 0.7NTU, clearance reaches 99.9%.And technological process is simple and easy to operate, adding of agent low cost.Overcome
Alkali-wash waste water is processed and is difficult to defect up to standard by currently available technology.
Embodiment 6
Utilize the alkali-wash waste water processing technological flow described in embodiment 1, the rustless steel alkali-wash waste water of certain factory is carried out
Utilizing this method to carry out the experiment processed, concrete operation step is as follows.
(1) neutralize: former for the alkali-wash waste water after defat water A is added neutralisation unit 1, according to pH value of waste water,
Add hydrochloric acid by its pH regulator to about 8.
(2) breakdown of emulsion: join in breakdown of emulsion unit 2 by waste water described in step (1), adds 50g/L demulsifier
1.5min, 70rpm low rate mixing 12min is quickly stirred, the Mud up-floating formed after breakdown of emulsion with 180rpm.On
After floating breakdown of emulsion mud D separates with waste water solid, scrape to mud-collecting slot with slag scraper, and certainly flow in mud storage pool 7.
The demulsifier that this stage uses is calcium chloride.
(3) coagulating sedimentation: the waste water after step (2) solid-liquid separation is added in coagulating sedimentation unit 3, add
70g/L coagulant (PAFS), stirs 2min with 150rpm, is subsequently added 120mg/L cation
Type polyacrylamide, stirs 10min with 70rpm.After solid-liquid separation, coagulated sludge E is bottom sedimentation tank
Mud storage pool 7 is introduced after concentration.
(4) photochemical catalytic oxidation: the waste water after step (3) solid-liquid separation is joined photochemical catalytic oxidation unit 4
In, add 8g/L hydrogen peroxide, stir 1.5h with 180rpm.
(5) degree of depth coagulating sedimentation: after step (4) being reacted, waste water adds degree of depth coagulating sedimentation unit 5, adds
After potassium hydroxide regulation pH value is 10, adds cationic-type polyacrylamide 70mg/L, stir with 30pm
35min.After solid-liquid separation, the degree of depth coagulated sludge F of generation introduces mud storage pool after concentrating bottom sedimentation tank
7。
(6) decolouring: the waste water after step (5) solid-liquid separation is joined in decolouring unit 6, add 60g/L
Hydrogen peroxide, stirs 3h with 300rpm.
(7) Treatment of Sludge: the mud collected in storage mud unit 7 is introduced dewatering unit 8, supernatant liquid from sludge dehydration C
Being back to neutralisation unit 1, dewatered sludge G transports outward disposal.
The alkali-wash waste water using the present embodiment processes the water quality clarification after PROCESS FOR TREATMENT, and the cycle that water processes is short, pH
It is down to 7.3 by 13.38；COD is down to 85mg/L by 9300mg/L, and clearance reaches 99.1%；Turbidity is by 683NTU
Being down to 0.6NTU, clearance reaches 99.9%.And technological process is simple and easy to operate, adding of agent low cost.Overcome
Alkali-wash waste water is processed and is difficult to defect up to standard by currently available technology.
The above-mentioned description to embodiment is to be understood that for ease of those skilled in the art and use to send out
Bright.These embodiments obviously easily can be made various amendment by person skilled in the art, and at this
The General Principle illustrated is applied in other embodiments without through performing creative labour.Therefore, the present invention does not limits
In above-described embodiment, those skilled in the art are according to the announcement of the present invention, without departing from changing that scope is made
Entering and revise all should be within protection scope of the present invention.
Claims (10)
1. the method for an efficient process alkali-wash waste water, it is characterised in that comprise the following steps:
A () neutralizes: collect pending alkali-wash waste water, sends into neutralisation unit, adds the first nertralizer regulation pH to 6-9；
B () breakdown of emulsion: the waste water after step (a) being neutralized is sent in breakdown of emulsion unit, adds demulsifier, stirring forms mud, solid-liquid separation, and mud sends into storage mud unit；
C () coagulating sedimentation: in the waste water of solid-liquid separation sends into coagulating sedimentation unit after breakdown of emulsion in step (b), adds coagulant, quickly stirs, add the first flocculant, low rate mixing, solid-liquid separation, produces mud and introduces storage mud unit；
D () photochemical catalytic oxidation: in the waste water of solid-liquid separation adds photocatalysis unit after coagulating sedimentation in step (c), adds oxidant, stirring reaction；
E () degree of depth coagulating sedimentation: after waste water after photochemical catalytic oxidation in step (d) is added degree of depth coagulation unit, adds the second nertralizer regulation pH to 9-12, add the second flocculant, low rate mixing, solid-liquid separation, and mud sends into storage mud unit；
F () is decoloured: joined by the waste water of solid-liquid separation after degree of depth coagulating sedimentation in step (e) in decolouring unit, adds decolorising agent, stirring reaction, i.e. obtains discharging water outlet after reaction；
G () Treatment of Sludge: the mud collected in storage mud unit introduces in dewatering unit, dehydration, and supernatant is back to neutralisation unit, the mud outward transport after dehydration is disposed.
The method of a kind of efficient process alkali-wash waste water the most according to claim 1, it is characterised in that the first nertralizer described in step (a) is hydrochloric acid or sulphuric acid.
The method of a kind of efficient process alkali-wash waste water the most according to claim 1, it is characterized in that, demulsifier described in step (b) is at least one in aluminium salt, magnesium salt, calcium salt, iron salt, surfactant or Bentonite, and it adds concentration is 5-200g/L.
The method of a kind of efficient process alkali-wash waste water the most according to claim 1, it is characterised in that in step (b), stirring is: first stir 0.5-3min with 100-300rpm, stir 5-30min with 20-80rpm subsequently.
The method of a kind of efficient process alkali-wash waste water the most according to claim 1, it is characterized in that, coagulant described in step (c) is at least one in aluminium polychlorid, poly-ferric chloride, PAFC, bodied ferric sulfate, polyaluminium sulfate, polymeric aluminium ferrum silicate, ferric chloride or aluminum sulfate, and it adds concentration is 5-100g/L；
The first described flocculant is surfactant or macromolecule flocculation aid, and it adds concentration is 10-200mg/L.
The method of a kind of efficient process alkali-wash waste water the most according to claim 1, it is characterised in that in step (c), quickly stirring is to stir 0.5-3min at 100-300rpm；
Low rate mixing is to stir 5-30min at 20-80rpm.
The method of a kind of efficient process alkali-wash waste water the most according to claim 1, it is characterised in that in step (d): described oxidant is hydrogen peroxide, ozone or sodium hypochlorite, it adds concentration is 1-30g/L；
Stirring reaction is: stir 0.5-5h under 100-300rpm.
The method of a kind of efficient process alkali-wash waste water the most according to claim 1, it is characterised in that in step (e): the second described nertralizer is sodium hydroxide or potassium hydroxide；
The second described flocculant is surfactant or macromolecule flocculation aid, and it adds concentration is 5-100mg/L.
The method of a kind of efficient process alkali-wash waste water the most according to claim 1, it is characterised in that in step (e), low rate mixing is: stir 10-40min under 20-80rpm.
The method of a kind of efficient process alkali-wash waste water the most according to claim 1, it is characterised in that in step (f): described decolorising agent is strong oxidizer, it adds concentration is 3-100g/L；
Stirring reaction time be: under 100-500rpm stir 0.5-5h.
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Application publication date: 20160907 |