CN109354289A - A kind of processing method of dyestuff system polaroid waste water - Google Patents
A kind of processing method of dyestuff system polaroid waste water Download PDFInfo
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- CN109354289A CN109354289A CN201811380118.6A CN201811380118A CN109354289A CN 109354289 A CN109354289 A CN 109354289A CN 201811380118 A CN201811380118 A CN 201811380118A CN 109354289 A CN109354289 A CN 109354289A
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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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
- C02F1/72—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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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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
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
Abstract
The invention belongs to polaroid technical field of waste water processing, more particularly to a kind of processing method of dyestuff system polaroid waste water, include: S01, waste water to be processed is provided, pH is adjusted less than 7, then be (1~5) by the mass ratio of ferrous salt and hydrogen peroxide: (0.5~2) sequentially adds ferrous salt and hydrogen peroxide, the first reaction is carried out, the first reaction solution is obtained；Flocculant is added in the first reaction solution, adjusts pH and is greater than 7, filtering obtains the first treatment fluid；S02, the pH for adjusting the first treatment fluid are heated less than 7, and be then (0.1~1) by the mass ratio of the second metal salt and hydrogen peroxide: (2~8) sequentially add the second metal salt and hydrogen peroxide, are carried out the second reaction, are obtained the second reaction solution；The pH for adjusting the second reaction solution is greater than 7, and filtering obtains second processing liquid；S03, decolorization is carried out to second processing liquid, obtains third treatment fluid；Second metal salt is the metal salt that energy catalyzing hydrogen peroxide generates hydroxyl radical free radical under acidic environment, and can precipitate under alkaline environment.
Description
Technical field
The invention belongs to polaroid technical field of waste water processing, and in particular to a kind of processing side of dyestuff system polaroid waste water
Method.
Background technique
Polaroid can be such that the light vibrated according to specific direction passes through to be a kind of, and can hardly make other direction of vibration
The film that light passes through is widely used in LCD liquid crystal display, polarisation sunglasses and 3D glasses.Currently, polaroid
There are mainly of two types: iodine system piece mating plate and dyestuff system polaroid, dyestuff system polaroid has the advantages that high-temp resisting high-humidity resisting, more next
Concern more by market.In dyestuff polaroid manufacturing process, PVA needs to use in dyeing process high two color of polarisation sub-prime
Property dyestuff, predominantly polyazo class dyestuff or the dyestuff with anthraquinone ring.It can be produced in the manufacturing process of dyestuff polaroid
Raw a large amount of waste water from dyestuff, the main component of waste water from dyestuff includes the moieties under washing on high dichroic dye and PVA film, this
A little material demands could be discharged by processing, such waste component is complicated, and color is also deep, and direct emission can cause environment seriously
Pollution.
Currently, there are mainly three types of the processing methods of this kind of waste water from dyestuff: the first, biological degradation method, this side is diluted with water
Method needs a large amount of water, and ineffective for some dye wastewater treatments for being difficult to degrade；The second, concentration and evaporation method, just
That the solid waste that directly obtains waste water triple effect evaporation or the molten contracting of MVR carries out burning disposal, need to consume a large amount of steam or
Electric power consumes energy, and cost of investment is also high；Third, in conjunction with flocculation sedimentation and decolorizing process technique, such as Chinese patent
The processing method of dyestuff system polaroid waste water disclosed in CN104003552A, the method is specifically includes the following steps: inclined in dyestuff system
Pretreating agent is added in mating plate waste water；The pH value of dyestuff system polaroid waste water is adjusted to 9-11；High-efficiency decolorant is added to carry out
Efficient flocculant is added later and carries out precipitation process for decolorization.Such methods are for some small molecules and are difficult to flocculated
Substance effect is bad, cannot achieve the effect that handle completely.
Summary of the invention
Goal of the invention of the invention is to provide a kind of processing method of dyestuff system polaroid waste water, it is intended to solve existing dye
Needs in the presence of material system polaroid wastewater treatment method expend a large amount of water resource and energy resource, water treatment efficiency are bad
With the technical problems such as processing cost height.
In order to achieve the above-mentioned object of the invention, the present invention provides a kind of processing methods of dyestuff system polaroid waste water, including
Following steps:
S01, waste water to be processed is provided, adjusts pH less than 7, be then by the mass ratio of ferrous salt and hydrogen peroxide (1~
5): (0.5~2) sequentially adds the ferrous salt and the hydrogen peroxide, carries out the first reaction, obtains the first reaction solution；Institute
It states and flocculant is added in the first reaction solution, adjust pH and be greater than 7, filtering obtains the first treatment fluid；
S02, the pH for adjusting first treatment fluid heat less than 7, then press the quality of the second metal salt and hydrogen peroxide
Than for (0.1~1): (2~8) sequentially add second metal salt and the hydrogen peroxide, carry out the second reaction, obtain second
Reaction solution；The pH for adjusting second reaction solution is greater than 7, and filtering obtains second processing liquid；
S03, decolorization is carried out to the second processing liquid, obtains third treatment fluid；
Second metal salt generates hydroxyl radical free radical for that can be catalyzed the hydrogen peroxide under acidic environment, and in alkalinity
The metal salt that can be precipitated under environment.
In the above-mentioned technical solutions, firstly, hydrogen peroxide, which is catalyzed in acidic environment by ferrous ion, generates hydroxyl free
Base, hydroxyl radical free radical have stronger oxidability, most of high molecular dye in waste water to be processed can be degraded to
Intermediate existing for various forms, when the ferrous ion in ferrous salt is oxidized to form iron ion under alkaline condition, in this
Mesosome is easy and iron ion complex-precipitation, the generation of promotion coagulant precipitation process；Moreover, iron ion is mutual also between flocculant
Cooperation further promotes impurity to generate the process of coagulant precipitation, while removing useless water part hard-degraded substance to be processed,
The most of organic matter removed in waste water to be processed can also be acted on by coagulant precipitation.Thus, in ferrous salt, hydrogen peroxide and wadding
Under the comprehensive function of solidifying agent, most of organic matter in waste water to be processed can be efficiently removed.On this basis, the present invention is into one
Step increases the usage amount of hydrogen peroxide in reaction process, enhances oxidative degradation by improving the generation quantity of hydroxyl radical free radical
Effect, and then depth removes the hard-degraded substance in waste water to be processed；Meanwhile also by reducing the inventory of the second metal salt,
The generation for reducing solid waste iron hydroxide, avoids new impurity from generating.Finally, the present invention passes through to successively by coagulant precipitation
Decolorization is carried out with the waste water of oxidative degradation, the pigment in waste water to be processed is removed, so that treatment fluid is colorless and transparent.
The present invention is by successively carrying out coagulant precipitation, oxidative degradation and decolorization to dyestuff system polaroid waste water, substantially
On can organic matter, hard-degraded substance and pigment etc. in fully erased waste water to be processed.Processing method is handled through the invention
Dyestuff system polaroid waste water meets relevant national standard in colorless and transparent, can be with direct emission.Compared with prior art, this hair
The bright method processing dyestuff system polaroid waste water combined by using coagulant precipitation with oxidative degradation, process optimization, water process
Excellent effect；Meanwhile the present invention mainly removes most of organic matter in waste water to be processed by using coagulation sedimentation, reduces
The dosage of hydrogen peroxide, and processing cost is greatly reduced without the water resource and energy resource that expend during processing,
With extensive commercial application prospect.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The embodiment of the invention provides a kind of processing methods of dyestuff system polaroid waste water, comprising the following steps:
S01, waste water to be processed is provided, adjusts pH less than 7, be then by the mass ratio of ferrous salt and hydrogen peroxide (1~
5): (0.5~2) sequentially adds ferrous salt and hydrogen peroxide, carries out the first reaction, obtains the first reaction solution；In the first reaction solution
Middle addition flocculant adjusts pH and is greater than 7, and filtering obtains the first treatment fluid；
S02, the pH for adjusting the first treatment fluid are heated less than 7, are then by the mass ratio of the second metal salt and hydrogen peroxide
(0.1~1): (2~8) sequentially add the second metal salt and hydrogen peroxide, carry out the second reaction, obtain the second reaction solution；It adjusts
The pH of second reaction solution is greater than 7, and filtering obtains second processing liquid；
S03, decolorization is carried out to second processing liquid, obtains third treatment fluid；
Second metal salt is that energy catalyzing hydrogen peroxide generates hydroxyl radical free radical under acidic environment, and sinks in alkaline environment
The metal salt in shallow lake.
Specifically, in step S01, adjust pH less than 7, hydrogen peroxide could pass through only in acidic environment ferrous iron from
Muonic catalysis effect generate hydroxyl radical free radical, therefore adjust pH be less than 7 purpose so that waste water to be processed pH value in acidity,
Promote the generation of hydroxyl radical free radical.PH is adjusted less than 7, the step for can refer to the routine operation of those skilled in the art, this hair
Bright embodiment is not especially limited.In embodiments of the present invention, it is instilled in solution to be processed using dropper or liquid-transfering gun appropriate
Dilute hydrochloric acid, dropwise addition when, can apply stirring simultaneously.
Preferably, the pH of waste water to be processed is adjusted to 2~4.When the pH of waste water to be processed is 2~4, the first reaction is carried out
When reaction system oxidability it is most strong.When pH is lower than 2, the hydrogen ion concentration in solution is excessively high, and iron ion cannot be smooth
Be reduced to ferrous ion, catalysis reaction is obstructed；When pH is higher than 4, ferrous ion is easily oxidized to iron ion, generates hydrogen
Iron oxide precipitates and loses catalytic capability.
Be (1~5) by the mass ratio of ferrous salt and hydrogen peroxide: (0.5~2) sequentially adds ferrous salt and hydrogen peroxide,
Carry out the first reaction.Ferrous salt and hydrogen peroxide, which are placed in acidic environment, can occur oxidation reaction, and hydrogen peroxide is in acidity
It is catalyzed in environment by ferrous ion and generates hydroxyl radical free radical, most of high molecular dye in waste water to be processed is degraded to each
Intermediate existing for kind of form, when the ferrous ion in ferrous salt is oxidized to form iron ion under alkaline condition, among this
Body is easy and iron ion complex-precipitation, the generation of promotion coagulant precipitation process.
The mass ratio of ferrous salt and hydrogen peroxide is set as (1~5): (0.5~2), its object is to: on the one hand, pass through control
The additive amount of hydrogen peroxide processed enables the hydroxyl radical free radical generated to promote coagulant precipitation while reducing processing cost
The progress of process；On the other hand, the content of solution ferrous ions is improved, ferrous ion can be oxidized to when solution alkaline
Iron ion, iron ion can promote the generation of impurity coagulation, flocculation process, and the coagulant precipitation effect of impurities in water can be improved；Control
The hydrogen peroxide use applied in water treatment procedure, investment reduction cost.
When adding ferrous salt and hydrogen peroxide, ferrous salt is first added, then add hydrogen peroxide.The reaction of hydrogen peroxide is living
Property it is more active, first add ferrous salt, then add hydrogen peroxide, can avoid hydrogen peroxide occurs in waste water to be processed oxidation drops
Solution also can avoid ferrous salt directly by hydrogen peroxide oxidation.
Preferably, the feeding mode of hydrogen peroxide is a small amount of repeatedly addition in batches.In embodiments of the present invention, divide 3~5
Hydrogen peroxide is added in batch.
Hydrogen peroxide in acid condition is more active, by the way that hydrogen peroxide is added on a small quantity in batches, on the one hand, can prevent
Hydrogen peroxide fast degradation reduces the generation quantity of hydroxyl radical free radical；On the other hand, it can prevent decomposable process from emerging a large amount of gas
Bubble, it is safe to the human body to cause damages.
Theoretically, the time for carrying out the first reaction is unsuitable too long, too long to will lead to treatment time of water growth, reduces day processing
Amount increases processing cost；But the reaction time too short can reduce water treatment efficiency.
Preferably, the time for carrying out the first reaction is 1h.
It is worth noting that, requiring to keep pH2~4 in the whole process that carry out first is reacted.When pH is less than 2, after
Phase needs to be added excessive sodium hydroxide for adjusting pH, increases processing cost；When pH is greater than 4, the hydroxide of part is had
Iron generates, and influences the effect of coagulant precipitation, reduces the clearance rate of useless Organic substance in water to be processed.
Flocculant is added in the first reaction solution, adjusts pH and is greater than 7, its purpose is to provide an alkaline environment, inductions
Promote the generation of coagulant precipitation process.Under alkaline environment, flocculant promotes impurities in water cohesion, flocculation to form wadding body, and promote
Into wadding body further growth until sedimentation；Meanwhile ferrous ion is oxidized to form iron ion, ferrous salt plays the work of coagulant
With the cohesion of promotion impurities in water, flocculation further enhance the coagulant precipitation process of impurities in water.Thus, in ferrous salt, mistake
Under the synergistic effect of hydrogen oxide and flocculant, most of organic matter in waste water to be processed can be efficiently removed.
Adjust pH and be greater than 7, the step for can refer to the routine operation of those skilled in the art, the embodiment of the present invention is not made to have
Body limits.In embodiments of the present invention, appropriate dilute solution of sodium hydroxide is instilled in the first reaction solution using dropper or liquid-transfering gun,
Stirring can be applied when dropwise addition simultaneously.
Preferably, pH is adjusted to 7~9 after flocculant is added.Ferrous ion can be oxidized under alkaline condition iron from
Son not only influences ferrous ion to the conversion between iron ion, but also when hydroxide ion is too low in water, nothing when pH is less than 7
Method guarantees that the iron ion in waste water to be processed being capable of complete flocks；When pH is greater than 9, needs to be added excessive sodium hydroxide and be used for
PH is adjusted, processing cost is increased.
Preferably, ferrous salt is at least one of green vitriol and frerrous chloride.This kind of ferrous salt price
Inexpensively, it can control processing cost in suitable range.
Preferably, the inventory of flocculant is the 0.001%~0.005% of wastewater quality to be processed.When flocculant
When inventory is excessive, it is easy to cause agent containing partial flocculation in processing water；But the inventory of flocculant it is too low when, it is to be processed useless
Organic matter removal effect in water is poor.In embodiments of the present invention, the inventory of flocculant is wastewater quality to be processed
0.001%.
Preferably, flocculant is selected as polyacrylamide and/or aluminium polychloride.
In an inventive embodiments, flocculant is polyacrylamide (PAM)；In another inventive embodiments, flocculant is
Aluminium polychloride；In another inventive embodiments, flocculant is the mixture of PAM and aluminium polychloride.
The flocculating effect of organic matter can be enhanced by carrying out stirring appropriate after flocculant is added, and be improved in waste water to be processed
The coagulant precipitation effect of organic matter.When the dynamics of stirring is excessive, flocculate is easy to cause to dissociate；When mixing power is spent it is small when,
It takes a long time.
Preferably, being also stirred after flocculant is added.Wherein, the revolving speed of stirring is 50~150rpm, stirring
Time in 5min or more.
In a preferred embodiment of the invention, the revolving speed of stirring is 100rpm, and the time of stirring is 5min.
In step S02, the pH of the first treatment fluid is adjusted less than 7, so that the pH value of waste water to be processed is in acidity, to promote
Generation into hydroxyl radical free radical improves an acidic environment.
Heating, for promoting the progress of oxidation reaction, general chemical reaction can accelerate reaction speed as the temperature rises,
Temperature increases the formation speed that can accelerate hydroxyl radical free radical, facilitates hydroxyl radical free radical and reacts with molecule difficult to degrade, improves oxidation
The removal rate of effect and COD.
Preferably, the temperature of heating is 40~80 DEG C.Hydrogen peroxide is catalyzed by ferrous ion generates in acid condition
The process of hydroxyl radical free radical is a more complicated reaction process, and temperature increases, while increasing the progress of positive reaction,
Accelerate side reaction.The experiment proved that temperature is higher than 80 DEG C when handling dyestuff system polaroid waste water, hydrogen peroxide is accelerated to decompose
For oxygen and water, it is unfavorable for the generation of hydroxyl radical free radical；Temperature is too low, and the reaction time is too long, and water treatment efficiency is lower.
Be (0.1~1) by the mass ratio of the second metal salt and hydrogen peroxide: (2~8) sequentially add the second metal salt and mistake
Hydrogen oxide carries out the second reaction, obtains the second reaction solution.In this reaction process, mainly by by the second metal salt catalyst
The hydroxyl radical free radical that hydrogen peroxide generates carries out oxidative degradation, hydroxyl radical free radical energy of oxidation to molecule difficult to degrade remaining in waste water
Power is stronger, can be broken some reluctant molecules difficult to degrade of conventional method of degradation and such as contain benzene ring structure molecule.
The mass ratio of second metal salt and hydrogen peroxide is (0.1~1): (2~8), compared to previous reaction, hydrogen peroxide
Dosage promoted.Reason for this is that: when carry out second is reacted, need more hydroxyl radical free radical to difficult to degrade in water
Molecule carries out oxidative degradation, and the second metal salt is to avoid introducing new impurity, the content of the second metal ion as catalyst
It is unsuitable excessively high, thus, all hydrogen peroxide generate hydroxyl radical free radical in the dosage energy catalytic solution of the second metal salt.
When adding ferrous salt and hydrogen peroxide, ferrous salt is first added, then add hydrogen peroxide.The reaction of hydrogen peroxide is living
Property it is more active, first add ferrous salt, then add hydrogen peroxide, can avoid hydrogen peroxide occurs in waste water to be processed oxidation drops
Solution also can avoid ferrous salt directly by hydrogen peroxide oxidation.
Preferably, the second metal salt is selected from least one of ferrous salt, mantoquita and manganese salt.It can be catalyzed peroxidating
Hydrogen generates hydroxyl radical free radical, and the metal salt that can be precipitated under alkaline environment under acidic environment.
It is worth noting that, requiring to keep pH2~4 in the whole process that carry out second is reacted, for preventing hydroxide
Iron precipitating generates.
The pH for adjusting the second reaction solution is greater than 7, for adjusting the second reaction solution in alkalinity, so that ferrous ions are formed
Iron ion, and by generating ferric hydroxide precipitate removal.
After the pH for adjusting the second reaction solution is added and is greater than 7, stirring appropriate is carried out and can enhance ferrous ion to be converted into
The speed of iron ion, and further iron ion is promoted to generate ferric hydroxide precipitate.
Preferably, being also stirred between the pH for adjusting the second reaction solution is greater than 7 and is filtered.Wherein, it stirs
The revolving speed mixed is 50~150rpm, and the time of stirring is in 20~30min or more.
In a preferred embodiment of the invention, the revolving speed of stirring is 100rpm, and the time of stirring is 30min.
In step S03), decolorization is carried out to second processing liquid, is mainly used for removing the pigment in waste water, so that place
Water is managed in colorless and transparent.
Preferably, decolorization uses active carbon, and active carbon is the 0.05%~0.2% of second processing liquid quality.
When activated carbon addition is too low, decolorization effect is reduced；When activated carbon addition is excessively high, increase processing cost.
To make, the above-mentioned implementation detail of the present invention and operation can be clearly readily appreciated by one skilled in the art and the present invention is real
It applies a progress performance for the processing method of dyestuff system polaroid waste water to embody significantly, by the following examples to reality of the invention
It applies and is illustrated.
Embodiment 1
In the production brown sun in polaroid glasses blade technolgy, the dyestuff waste liquid of generation flows into purification tank for liquid waste, through detecting,
The COD (COD) of the waste water is 3130mg/L, inorganic salt content 1%, pH7.2.
In order to handle above-mentioned dyestuff system polaroid waste water, a kind of processing of dyestuff system polaroid waste water is present embodiments provided
Method specifically includes step:
S11, the pH to 2 for adjusting waste water to be processed, sequentially add green vitriol and peroxide while stirring
Change hydrogen, keep pH2~3, carry out the first reaction, after reacting 1h, flocculant PAM is added and reaction solution is adjusted using sodium hydroxide
PH to 8, filtering obtains the first filter residue and the first treatment fluid, and the first filter residue is sent to fixed-end forces factory and carries out burning disposal, first
The COD for the treatment of fluid is 1020mg/L.
In this step, the inventory of ferrous sulfate is the 2% of wastewater quality to be processed, the inventory of hydrogen peroxide be to
Handle the 0.5% of wastewater quality.
S12, the pH to 2 for adjusting the first treatment fluid, and 50 DEG C are heated to, green vitriol is then added and mixes, sulphur
Sour ferrous additional amount is the 1% of the first treatment fluid quality；Later, hydrogen peroxide is added in three times while stirring, altogether
3% that amount of hydrogen peroxide is the first treatment fluid quality is added, keeps pH2~3, the second reaction is carried out, after reacting 2h, using hydrogen
Sodium oxide molybdena adjusts the pH to 8.5 of reaction solution, and filtering obtains the second filter residue and second processing liquid, the second filter residue is sent to fixed-end forces
Factory carries out burning disposal, and the COD of second processing liquid is 35mg/L.
S13, the active carbon stirring that second processing liquid quality 0.05% is added in second processing liquid carry out decolorization, mistake
Filter, obtains active carbon filter residue and third treatment fluid.The COD of third treatment fluid is 25mg/L, and salt content 1% reaches national row
Standard is put, therefore third treatment fluid can be sent to the processing recycling and reusing of active carbon sintering plant with direct emission, active carbon filter residue.
Embodiment 2
In the production vehicle-mounted LCD polarisation blade technolgy of yellow, the waste liquid of generation is flowed into liquid waste processing pond, the dyestuff waste liquid
Dye component is complicated, after measured, COD 3210mg/L, inorganic salt content 1%, pH 7.5.
In order to handle above-mentioned dyestuff system polaroid waste water, a kind of processing of dyestuff system polaroid waste water is present embodiments provided
Method specifically includes step:
S21, the pH to 2 for adjusting waste water to be processed, sequentially add green vitriol and peroxide while stirring
Change hydrogen, keep pH2~3, carry out the first reaction, after reacting 1h, flocculant PAM is added and reaction solution is adjusted using sodium hydroxide
PH to 8, filtering obtains the first filter residue and the first treatment fluid, and the first filter residue is sent to fixed-end forces factory and carries out burning disposal, first
The COD for the treatment of fluid is 1220mg/L.
In this step, the inventory of ferrous sulfate is the 3% of wastewater quality to be processed, the inventory of hydrogen peroxide be to
Handle the 0.5% of wastewater quality.
S22, the pH to 2 for adjusting the first treatment fluid, and 50 DEG C are heated to, green vitriol is then added and mixes, sulphur
Sour ferrous additional amount is the 0.5% of the first treatment fluid quality；Later, hydrogen peroxide is added in three times while stirring,
5% that amount of hydrogen peroxide is the first treatment fluid quality is added altogether, keeps pH2~3, carries out the second reaction, after reacting 2h, uses
Sodium hydroxide adjusts the pH to 8.5 of reaction solution, and filtering obtains the second filter residue and second processing liquid, the second filter residue is sent at solid waste
It manages factory and carries out burning disposal, the COD of second processing liquid is 46mg/L.
S23, the active carbon stirring that second processing liquid quality 0.05% is added in second processing liquid carry out decolorization, mistake
Filter, obtains active carbon filter residue and third treatment fluid.The COD of third treatment fluid is 25mg/L, and salt content 1% reaches national row
Standard is put, therefore third treatment fluid can be sent to the processing recycling and reusing of active carbon sintering plant with direct emission, active carbon filter residue.
Embodiment 3
In production yellow green sunglasses in polarisation blade technolgy, the waste liquid of generation is flowed into liquid waste processing pond, the dyestuff
Waste liquid dye component is complicated, after measured, COD 4830mg/L, inorganic salt content 1%, pH 7.4.
In order to handle above-mentioned dyestuff system polaroid waste water, a kind of processing of dyestuff system polaroid waste water is present embodiments provided
Method specifically includes step:
S31, the pH to 2 for adjusting waste water to be processed, sequentially add green vitriol and peroxide while stirring
Change hydrogen, keep pH2~3, carry out the first reaction, after reacting 1h, flocculant PAM is added and reaction solution is adjusted using sodium hydroxide
PH to 8, filtering obtains the first filter residue and the first treatment fluid, and the first filter residue is sent to fixed-end forces factory and carries out burning disposal, first
The COD for the treatment of fluid is 1380mg/L.
In this step, the inventory of ferrous sulfate is the 3.2% of wastewater quality to be processed, and the inventory of hydrogen peroxide is
The 0.5% of wastewater quality to be processed.
S32, the pH to 2 for adjusting the first treatment fluid, and 70 DEG C are heated to, green vitriol is then added and mixes, sulphur
Sour ferrous inventory is the 0.5% of the first treatment fluid quality；Later, hydrogen peroxide is added in three times while stirring,
3% that amount of hydrogen peroxide is the first treatment fluid quality is added altogether, keeps pH2~3, carries out the second reaction, after reacting 2h, uses
Sodium hydroxide adjusts the pH to 8.5 of reaction solution, and filtering obtains the second filter residue and second processing liquid, the second filter residue is sent at solid waste
It manages factory and carries out burning disposal, the COD of second processing liquid is 72mg/L.
S33, the active carbon stirring that second processing liquid quality 0.05% is added in second processing liquid carry out decolorization, mistake
Filter, obtains active carbon filter residue and third treatment fluid.The COD of third treatment fluid is 30mg/L, and salt content 1% reaches national row
Standard is put, therefore third treatment fluid can be sent to the processing recycling and reusing of active carbon sintering plant with direct emission, active carbon filter residue.
Embodiment 4
In production grey sunglasses in polarisation blade technolgy, the waste liquid of generation is flowed into liquid waste processing pond, and the dyestuff is useless
Liquid dye component is complicated, after measured, COD 8710mg/L, inorganic salt content 1.2%, pH 7.2.
In order to handle above-mentioned dyestuff system polaroid waste water, a kind of processing of dyestuff system polaroid waste water is present embodiments provided
Method specifically includes step:
S41, the pH to 2 for adjusting waste water to be processed, sequentially add green vitriol and peroxide while stirring
Change hydrogen, keep pH2~3, carry out the first reaction, after reacting 1h, flocculant PAM is added and reaction solution is adjusted using sodium hydroxide
PH to 8, filtering obtains the first filter residue and the first treatment fluid, and the first filter residue is sent to fixed-end forces factory and carries out burning disposal, first
The COD for the treatment of fluid is 1530mg/L.
In this step, the inventory of ferrous sulfate is the 4% of wastewater quality to be processed, the inventory of hydrogen peroxide be to
Handle the 0.8% of wastewater quality.
S42, the pH to 2 for adjusting the first treatment fluid, and 70 DEG C are heated to, green vitriol is then added and mixes, sulphur
Sour ferrous inventory is the 0.5% of the first treatment fluid quality；Later, hydrogen peroxide is added in three times while stirring,
3.5% that amount of hydrogen peroxide is the first treatment fluid quality is added altogether, keeps pH2~3, carries out the second reaction, after reacting 2h, adopts
The pH to 8.5 of reaction solution is adjusted with sodium hydroxide, filtering obtains the second filter residue and second processing liquid, the second filter residue is sent to solid waste
Treatment plant carries out burning disposal, and the COD of second processing liquid is 95mg/L.
S43, the active carbon stirring that second processing liquid quality 0.05% is added in second processing liquid carry out decolorization, mistake
Filter, obtains active carbon filter residue and third treatment fluid.The COD of third treatment fluid is 40mg/L, and salt content 1.2% reaches country
Discharge standard, therefore third treatment fluid can be sent to the processing recycling and reusing of active carbon sintering plant with direct emission, active carbon filter residue.
Comparative example 1
This comparative example provides a kind of processing method of dyestuff system polaroid waste water, and the difference with embodiment 4 is:
A, the step of the step of the step of omission step (1), former embodiment 4 (2) is this comparative example (1), former embodiment 4
(3) be this comparative example the step of (2)；
B, the inventory of the ferrous sulfate in this comparative example step (1) is the 0.5% of waste water to be processed, the throwing of hydrogen peroxide
Doses is the 13% of waste water to be processed.
Through detecting, the COD of the processing water obtained by this comparative example is 50mg/L.It compares with embodiment 4, is walked when omitting
Suddenly when (1), although similar COD removal effect can be reached by increasing the dosage of hydrogen peroxide, hydrogen peroxide
Price be much higher than ferrous sulfate, the dosage of hydrogen peroxide is four times of 3 hydrogen peroxide usage amount of embodiment, processing cost pole
Height is not suitable for the large scale processing of dyestuff system polaroid waste water.
Comparative example 2
This comparative example provides a kind of processing method of dyestuff system polaroid waste water, and the difference with embodiment 4 is: step
Temperature control when carrying out the second reaction in (2) suddenly is 25 DEG C, reaction time 8h.
Through detecting, the COD of the processing water obtained by this comparative example is 62mg/L.
Comparative example 3
This comparative example provides a kind of processing method of dyestuff system polaroid waste water, and the difference with embodiment 4 is: step
Temperature control when carrying out the second reaction in (2) suddenly is 90 DEG C, reaction time 1h.
Through detecting, the COD of the processing water obtained by this comparative example is 1260mg/L.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of processing method of dyestuff system polaroid waste water, which comprises the following steps:
S01, waste water to be processed is provided, adjusts pH less than 7, is then (1~5) by the mass ratio of ferrous salt and hydrogen peroxide:
(0.5~2) sequentially adds the ferrous salt and the hydrogen peroxide, carries out the first reaction, obtains the first reaction solution；Described
Flocculant is added in one reaction solution, adjusts pH and is greater than 7, filtering obtains the first treatment fluid；
S02, the pH for adjusting first treatment fluid are heated less than 7, are then by the mass ratio of the second metal salt and hydrogen peroxide
(0.1~1): (2~8) sequentially add second metal salt and the hydrogen peroxide, carry out the second reaction, obtain the second reaction
Liquid；The pH for adjusting second reaction solution is greater than 7, and filtering obtains second processing liquid；
S03, decolorization is carried out to the second processing liquid, obtains third treatment fluid；
Second metal salt generates hydroxyl radical free radical for that can be catalyzed the hydrogen peroxide under acidic environment, and in alkaline environment
The lower metal salt that can be precipitated.
2. processing method according to claim 1, which is characterized in that second metal salt be selected from ferrous salt, mantoquita and
At least one of manganese salt.
3. processing method according to claim 1, which is characterized in that the temperature of heating described in step S02 is 40~80 DEG C.
4. processing method according to any one of claims 1 to 3, which is characterized in that flocculant described in step S01 feeds intake
Amount is the 0.001%~0.005% of the wastewater quality to be processed.
5. processing method according to any one of claims 1 to 3, which is characterized in that decolorization described in step S03 uses
Active carbon；
The active carbon is the 0.05%~0.2% of the second processing liquid quality.
6. processing method according to any one of claims 1 to 3, which is characterized in that the feeding mode of the hydrogen peroxide
It is repeatedly added to be in batches a small amount of.
7. processing method according to any one of claims 1 to 3, which is characterized in that the flocculant is polyacrylamide
And/or aluminium polychloride.
8. processing method according to any one of claims 1 to 3, which is characterized in that in step S01, the wadding is being added
After solidifying agent, it is stirred；And/or
In step S02, it is greater than 7 in the pH for adjusting second reaction solution and be stirred between the filtering.
9. according to the described in any item processing methods of claim 8, which is characterized in that in step S01, the revolving speed of the stirring is
50~150rpm, the time of the stirring are 5min or more.
10. processing method according to claim 8, which is characterized in that in step S02, the revolving speed of the stirring is 50~
150rpm stirs 20~30min.
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