CN109019977A - A kind of dyeing alkali decrement waste water pretreating process - Google Patents
A kind of dyeing alkali decrement waste water pretreating process Download PDFInfo
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- CN109019977A CN109019977A CN201811006897.3A CN201811006897A CN109019977A CN 109019977 A CN109019977 A CN 109019977A CN 201811006897 A CN201811006897 A CN 201811006897A CN 109019977 A CN109019977 A CN 109019977A
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- waste water
- alkali decrement
- decrement waste
- acid
- dyeing
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Classifications
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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
-
- 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
-
- 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
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
-
- 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
-
- 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
-
- 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
- C02F2001/007—Processes including a sedimentation step
Abstract
The present invention relates to field of printing and dyeing, and in particular to a kind of dyeing alkali decrement waste water pretreating process.A kind of dyeing alkali decrement waste water pretreating process of the present invention includes the following steps: that (1) is collected alkali decrement waste water and entered in raw water conditioning tank；(2) alkali decrement waste water in raw water conditioning tank is transported in the first reaction zone, and magnesium salts is added, stirred；(3) by step (2), treated, and alkali decrement waste water is delivered to solid-liquid separation tank, and by air bearing, natural sedimentation, is centrifuged or the mode of plate compression be separated by solid-liquid separation as dross and water outlet；The dross is scraped by Slag Scraping Device to dump tank, and the water outlet enters ceramic filter；(4) water outlet in ceramic filter enters workshop reuse, or is delivered to acid precipitation reaction slot and acid is added, and being stirred well to pH value is 3-5, and terephthalic acid (TPA) is precipitated；(5) muddy water after terephthalic acid (TPA) is precipitated in acid precipitation reaction slot is obtained into filter cake and filtrate by filter press, obtained filtrate carries out biochemical treatment again.
Description
Technical field
The present invention relates to field of printing and dyeing, and in particular to a kind of dyeing alkali decrement waste water pretreating process.
Technical background
Alkali reduction is the process that dacron is handled in high temperature and denseer caustic lye of soda, and terylene surface is etched by highly basic
Afterwards, quality mitigates, and fibre diameter attenuates, and surface forms pit, and the shearing rigidity decline of fiber eliminates the pole of dacron thread
Light, and the gap of fabric intertwined point is increased, so that fabrics feel soft, soft glossy, improve moisture absorbing and sweat releasing property, there is silkworm
Soyeux style, therefore dyeing alkali decrement treatment is also referred to as Silk-Like Finishing.
Alkali Weight Reduction Treatment of Polyester is a kind of reaction process of complexity, the main multiphase occurred between polyester macromolecule object and sodium hydroxide
Hydrolysis.In sodium hydrate aqueous solution, the ester linkage hydrolyzing of fiber surface polyester molecule chain is broken, and constantly forms different polymerizations
The hydrolysate of degree, the main component of generated waste water are terephthalic acid (TPA) or its sodium salt, excessive sodium hydroxide, second two
Alcohol, polyester oligomer and a small amount of various auxiliary agents.Often there are high ph-values (> 12) and high cod values (> 8000 in alkali decrement waste water
Mg/L) the characteristics of, and the benzene ring structure microorganism of terephthalic acid (TPA) cannot degrade, can not directly carry out biochemical treatment.Cause
This, the prior art of Alkali Weight Reduction Treatment of Polyester wastewater treatment usually first carries out physico-chemical process pretreatment, and such as direct acid-precipitation method, flocculation is (mixed
It is solidifying) acid-precipitation method, film pretreatment acid-precipitation method, membrane filtration combined coagulant technology acid-precipitation method etc., it can be by therein to benzene two when pH value of waste water is to 3 ~ 5
Sodium formate becomes terephthalic acid (TPA) and is precipitated and is recovered, and the waste water that filtrate generates with other techniques in dyeing process again mixes progress
Biochemical treatment.
Existing physico-chemical process preconditioning technique is primarily present the shortcomings that two aspects: first is that causing the alkali wasting of resources and cost
It is higher.Though direct acid-precipitation method simple process, obtained terephthalic acid (TPA) purity is lower, and utility value is not high, and this method is straight
It connects and neutralizes a large amount of alkali in waste water with acid, effective recycling and reusing is not carried out to alkali, causes the larger wasting of resources.In addition, wadding
Solidifying (coagulation) acid-precipitation method is flocculated (coagulation) to waste water using materials such as organic polymer flocculating decoloring agent or aluminum sulfate in advance
Decoloration, though the purity of this terephthalic acid (TPA) for improving acid-precipitation method acquisition, its cost is also higher, and uses aluminum sulfate coagulation
The aluminium hydroxide formed afterwards can be partly dissolved again and be suspended in strong base solution, and sedimentation is difficult.Second is that complex process and filter hole
Road easily blocks.Patent CN201410023018.3 adds magnesium sulfate or magnesium chloride in alkali decrement waste water, anti-with alkali using magnesium salts
The positively charged magnesium hydrate precipitate absorption p-phthalic bridge that should be generated, and be filtered using inoranic membrane.Such film is pre-
Though processing mode can be effectively reduced COD value of waste water, there are more impurity in addition to para-phthalic sodium in filter residue, formed after acid out
Crude terephthalic acid cannot achieve high value added utilization, and with the increase of film pretreatment time, Pollutants in Wastewater matter
Various physical reactions have occurred with membrane interaction, so that pollutant is accumulated in film surface or duct, membrane aperture are caused to become smaller or block up
Plug, this reduces filter efficiency instead, and processing cost is also got higher.In addition, the prior art is using suspension, emulsification, chelating, washing etc.
Mode removes the impurity in terephthalic acid (TPA), though having achieved the purpose that separating-purifying, the process is more complicated for it, and need to match miscellaneous
The characteristic of matter.Therefore, the present invention is intended to provide a kind of simple process, reuse low in cost and being able to achieve alkali in alkali decrement waste water
And the pretreating process of terephthalic acid (TPA) purification.
Summary of the invention
To solve the above problems, the present invention provides a kind of dyeing alkali decrement waste water pretreating process, concrete scheme
It is as follows:
A kind of dyeing alkali decrement waste water pretreating process, includes the following steps:
(1) alkali decrement waste water is collected to enter in raw water conditioning tank；(raw water conditioning tank can collect alkali decrement waste water and play uniform water
Matter effect)
(2) alkali decrement waste water in raw water conditioning tank is transported in the first reaction zone, and magnesium salts is added, stirred；
(3) by step (2), treated, and alkali decrement waste water is delivered to solid-liquid separation tank, passes through air bearing, natural sedimentation, centrifugation or plate
It is dross and water outlet that the mode of frame filters pressing, which be separated by solid-liquid separation,；The dross is scraped by Slag Scraping Device to dump tank, the water outlet into
Enter ceramic filter；
(4) water outlet in ceramic filter enters workshop reuse, or is delivered to acid precipitation reaction slot and acid is added, and is stirred well to
PH value is 3-5, and terephthalic acid (TPA) is precipitated；
(5) muddy water after terephthalic acid (TPA) is precipitated in acid precipitation reaction slot is obtained into filter cake and filtrate by filter press, it is acquired
Filtrate carry out biochemical treatment again.
The step (2) enters back into second reaction zone after the first reaction zone, and Trace PAM is added, and stirs
It mixes.
In the step (2) additional amount of polyacrylamide be alkali decrement waste water quality hundred a ten thousandths to 100,000/
One.
The polyacrylamide is anion-polyacrylamide.
The magnesium salts is magnesium sulfate and its crystal or magnesium chloride.
The present invention is to be located in advance using " flocculation-air bearing-acid out " process integration to the alkali decrement waste water of dyeing
Reason.According to the high feature of alkali decrement waste water alkalinity, appropriate epsom salt or magnesium chloride are first added into waste water, utilizes it
The impurity such as polyester oligomer, various auxiliary agents are reacted in the magnesium hydroxide wadding body strong adsorption waste water generated with alkali and on a small quantity to benzene two
Sodium formate, to realize the purifying purpose of para-phthalic sodium in waste water, but because considering that magnesium hydroxide floc particle is tiny, in short-term
It is inside difficult to the problem of precipitating completely, therefore adds the micro PAM(prior art into waste water again and often needs to put into a large amount of PAM, is increased
Cost), using its gantry suction-operated between the magnesium hydroxide suspended particulate that is scattered in waste water, form bigger group
Then block wadding body makes bulk wadding body float rapidly in flotation tank by air bearing mode, waste water is as clear as crystal simultaneously after dross is discharged
Still contain a large amount of alkali (pH > 12), it can further acid out goes out purity with the reuse of Alkali reduction workshop or when sulfuric acid to pH value being added to be 3 ~ 5
About 95% PTA.Present invention process is simple, and the workshop reuse of alkali in waste water and the purification of PTA may be implemented, and it is additional to meet PTA high
The requirement that value utilizes saves entreprise cost, is a kind of economically viable alkali decrement waste water pretreating process.
The present invention have it is following a little:
(1) present invention uses " flocculation-air bearing-acid out " combined pretreatment technique, wherein magnesium hydrate precipitate adsorbs waste water in advance
The impurity such as middle polyester oligomer, various auxiliary agents and a small amount of para-phthalic sodium, PAM enhanced flocculation effect.
(2) additional amount of epsom salt or magnesium chloride involved in technique be alkali decrement waste water quality one thousandth extremely
3 percent.
(3) PAM involved in technique, using anionic, cationic PAM is unfavorable to subsequent finished product, and viscosity is big.Therefore
Preferably anionic.And the additional amount of polyacrylamide is hundred a ten thousandths of alkali decrement waste water quality to 100,000 in the application
/ mono-, additional amount is few, at low cost.
(4) air floatation machine involved in technique, including super efficiency shallow air flotation machine, air flotation turbo and flat flow air floatation machine.
(5) waste water is as clear as crystal after air bearing deslagging and still contains a large amount of alkali (pH > 12), can with the reuse of Alkali reduction workshop or
Further acid out goes out the PTA of purity about 95% when sulfuric acid to pH value being added to be 3 ~ 5.It will use active carbon etc. in the prior art to carry out
Filter, can often bring new impurity into.
(6) mode of wadding body natural sedimentation can also be used in a manner of replacement air bearing in separation of solid and liquid involved in technique.
(7) the method for the present invention is simple, has operated, and cost is relatively low.
Detailed description of the invention
A kind of flow diagram of dyeing alkali decrement waste water pretreating process of Fig. 1 present invention.
Specific embodiment
Embodiment 1
As shown in Fig. 1 flow chart, conveying is realized by pumping
(1) alkali decrement waste water is collected to enter in raw water conditioning tank；
(2) alkali decrement waste water in raw water conditioning tank is transported in the first reaction zone, and magnesium chloride is added (additional amount subtracts for alkali
‰), stirring enters back into second reaction zone, and micro polyacrylamide is added after the first reaction zone for the 1 of amount wastewater quality
Amine, stirring；Wherein polyacrylamide accounts for hundred a ten thousandths of alkali decrement waste water quality；
(3) by step (2), treated, and alkali decrement waste water is delivered to solid-liquid separation tank, is separated by solid-liquid separation by pneumatically supported mode
For dross and water outlet；The dross is scraped by Slag Scraping Device to dump tank, and the water outlet enters ceramic filter；
(4) water outlet in ceramic filter enters workshop reuse, or is delivered to acid precipitation reaction slot and acid is added, and is stirred well to
PH value is 3-5, and terephthalic acid (TPA) is precipitated；
(5) muddy water after terephthalic acid (TPA) is precipitated in acid precipitation reaction slot is obtained into filter cake and filtrate by filter press, it is acquired
Filtrate carry out biochemical treatment again.
Its CODcr is 47200mg/L, and turbidity is 190 degree, and basicity 20600mg/L, PTA purity is 94%.
Embodiment 2
(1) alkali decrement waste water is collected to enter in raw water conditioning tank；
(2) alkali decrement waste water in raw water conditioning tank is transported in the first reaction zone, and epsom salt is added (additional amount is
The 3% of alkali decrement waste water quality), stirring；
(3) by step (2), treated, and alkali decrement waste water is delivered to solid-liquid separation tank, and solid-liquid is carried out by way of natural sedimentation
It is separated into dross and water outlet；The dross is scraped by Slag Scraping Device to dump tank, and the water outlet enters ceramic filter；
(4) water outlet in ceramic filter enters workshop reuse, or is delivered to acid precipitation reaction slot and acid is added, and is stirred well to
PH value is 3-5, and terephthalic acid (TPA) is precipitated；
(5) muddy water after terephthalic acid (TPA) is precipitated in acid precipitation reaction slot is obtained into filter cake and filtrate by filter press, it is acquired
Filtrate carry out biochemical treatment again.
Its CODcr is 26190mg/L, and turbidity is 172 degree, and basicity 18400mg/L, PTA purity is 98%.
Embodiment 3
(1) alkali decrement waste water is collected to enter in raw water conditioning tank；
(2) alkali decrement waste water in raw water conditioning tank is transported in the first reaction zone, and epsom salt is added (additional amount is
‰), stirring enters back into second reaction zone, and micro polypropylene is added after the first reaction zone for the 3 of alkali decrement waste water quality
Amide, stirring；Wherein polyacrylamide accounts for ten a ten thousandths of alkali decrement waste water quality；
(3) by step (2), treated, and alkali decrement waste water is delivered to solid-liquid separation tank, is separated by solid-liquid separation by pneumatically supported mode
For dross and water outlet；The dross is scraped by Slag Scraping Device to dump tank, and the water outlet enters ceramic filter；
(4) water outlet in ceramic filter enters workshop reuse, or is delivered to acid precipitation reaction slot and acid is added, and is stirred well to
PH value is 3-5, and terephthalic acid (TPA) is precipitated；
(5) muddy water after terephthalic acid (TPA) is precipitated in acid precipitation reaction slot is obtained into filter cake and filtrate by filter press, it is acquired
Filtrate carry out biochemical treatment again.
Its CODcr is 44400mg/L, and turbidity is 198 degree, and basicity 18800mg/L, PTA purity is 96%.
Embodiment 4
(1) alkali decrement waste water is collected to enter in raw water conditioning tank；
(2) alkali decrement waste water in raw water conditioning tank is transported in the first reaction zone, and epsom salt is added (additional amount is
‰), stirring enters back into second reaction zone, and micro polypropylene is added after the first reaction zone for the 5 of alkali decrement waste water quality
Amide, stirring；Wherein polyacrylamide accounts for 2/1000000ths of alkali decrement waste water quality；
(3) by step (2), treated, and alkali decrement waste water is delivered to solid-liquid separation tank, is separated by solid-liquid separation by way of centrifugation
For filter residue and water outlet；The filter residue to slag-drip opening discharges, and the water outlet enters ceramic filter；
(4) water outlet in ceramic filter enters workshop reuse, or is delivered to acid precipitation reaction slot and acid is added, and is stirred well to
PH value is 3-5, and terephthalic acid (TPA) is precipitated；
(5) muddy water after terephthalic acid (TPA) is precipitated in acid precipitation reaction slot is obtained into filter cake and filtrate by filter press, it is acquired
Filtrate carry out biochemical treatment again.
Its CODcr is 25510mg/L, and turbidity is 158 degree, and basicity 14600mg/L, PTA purity is 96%.
Claims (6)
1. a kind of dyeing alkali decrement waste water pretreating process, which comprises the steps of:
(1) alkali decrement waste water is collected to enter in raw water conditioning tank；
(2) alkali decrement waste water in raw water conditioning tank is transported in the first reaction zone, and magnesium salts is added, stirred；
(3) by step (2), treated, and alkali decrement waste water is delivered to solid-liquid separation tank, passes through air bearing, natural sedimentation, centrifugation or plate
It is dross and water outlet that the mode of frame filters pressing, which be separated by solid-liquid separation,；The dross is scraped by Slag Scraping Device to dump tank, the water outlet into
Enter ceramic filter；
(4) water outlet in ceramic filter enters workshop reuse, or is delivered to acid precipitation reaction slot and acid is added, and is stirred well to
PH value is 3-5, and terephthalic acid (TPA) is precipitated；
(5) muddy water after terephthalic acid (TPA) is precipitated in acid precipitation reaction slot is obtained into filter cake and filtrate by filter press, it is acquired
Filtrate carry out biochemical treatment again.
2. a kind of dyeing alkali decrement waste water pretreating process as described in claim 1, it is characterised in that: the step
(2) it is entered back into second reaction zone after the first reaction zone, and Trace PAM is added, stirred.
3. a kind of dyeing alkali decrement waste water pretreating process as claimed in claim 2, it is characterised in that: the step
(2) additional amount of polyacrylamide is hundred a ten thousandths to ten a ten thousandths of alkali decrement waste water quality in.
4. a kind of dyeing alkali decrement waste water pretreating process as claimed in any one of claims 1-3, it is characterised in that:
The polyacrylamide is anion-polyacrylamide.
5. a kind of dyeing alkali decrement waste water pretreating process as described in claim 1, it is characterised in that: the magnesium salts is
Magnesium sulfate and its crystal or magnesium chloride.
6. a kind of dyeing alkali decrement waste water pretreating process as described in claim 1, it is characterised in that: the step
(2) additional amount of magnesium salts is the one thousandth of alkali decrement waste water quality in step (1) to 3 percent in.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111392751A (en) * | 2020-04-24 | 2020-07-10 | 常州市五洲环保科技有限公司 | Method for preparing ultra-dispersed nano magnesium oxide for chlorinated polyethylene by using alkali decrement wastewater |
| CN114074997A (en) * | 2020-08-18 | 2022-02-22 | 浙江唯水环保技术有限公司 | Method for treating alkali reduction wastewater |
| CN114195331A (en) * | 2021-12-31 | 2022-03-18 | 淄博志升信息科技有限公司 | Treatment process of terylene alkali weight reduction wastewater |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111392751A (en) * | 2020-04-24 | 2020-07-10 | 常州市五洲环保科技有限公司 | Method for preparing ultra-dispersed nano magnesium oxide for chlorinated polyethylene by using alkali decrement wastewater |
| CN111392751B (en) * | 2020-04-24 | 2023-03-24 | 常州市五洲环保科技有限公司 | Method for preparing ultra-dispersed nano magnesium oxide for chlorinated polyethylene by using alkali decrement wastewater |
| CN114074997A (en) * | 2020-08-18 | 2022-02-22 | 浙江唯水环保技术有限公司 | Method for treating alkali reduction wastewater |
| CN114195331A (en) * | 2021-12-31 | 2022-03-18 | 淄博志升信息科技有限公司 | Treatment process of terylene alkali weight reduction wastewater |
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