CN108840479A - A kind of printing and dyeing PVA pretreatment method for wastewater - Google Patents
A kind of printing and dyeing PVA pretreatment method for wastewater Download PDFInfo
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- CN108840479A CN108840479A CN201810773614.1A CN201810773614A CN108840479A CN 108840479 A CN108840479 A CN 108840479A CN 201810773614 A CN201810773614 A CN 201810773614A CN 108840479 A CN108840479 A CN 108840479A
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- pva
- printing
- dyeing
- water
- pretreatment method
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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
- C02F1/24—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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- 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
- C02F2101/34—Organic compounds containing oxygen
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention discloses a kind of printing and dyeing PVA pretreatment method for wastewater, include the following steps：1, methanol solution is added in PVA waste water, controls reaction chamber water temperature at 80 ~ 90 DEG C, pH is 7 ~ 9, and mixing speed is in 40 ~ 50r/min, 2 ~ 4h of reaction time；2, continue to stir, temperature is down to 50 ~ 60 DEG C, is added glutaraldehyde solution and hydrochloric acid in PVA waste water, and pH control is 5 ~ 7,6 ~ 8h of reaction time；3, stop stirring, the blast aeration into reactor, aeration intensity is controlled in 0.5 ~ 1.5m3/min100m3 water, until near 40 DEG C of water temperature hereinafter, water surface forms PVA gel group or particle；4, PVA gel group or particle are struck off；5, remaining sewage enters lower one for the treatment of process.Acetate groups removal rate of the present invention up to 99.9% or more, PVA removal rate up to 80% or more, economic cost is reasonable.
Description
Technical field
The invention belongs to environmental technology field more particularly to a kind of printing and dyeing PVA pretreatment method for wastewater.
Background technique
PVA has COD high as slurry widely used in sizing process, waste water（5000~ 10000mg/L）, B/C
Than low（0.1 or less）, the features such as basicity is high.Conventional PVA pretreating process, it is past such as absorption+hydrolysis acidification+multi-stage aerobic technique
Scale printing and dyeing enterprise is more uniformly gone up toward the larger and water quality and quantity for water, when enterprise's PVA discharge of wastewater is uneven or water
When measuring little, various problems just will appear using the PVA pretreating process of materialization means：Such as, gel of saltouing, salinity adds excessively high
It will affect subsequent biochemical section treatment effeciency, and complex process, be not suitable for small water technique；Membrane separation technique, equipment is more, dimension
Shield is difficult；Foamet, foam are difficult to be directly separated；Advanced oxidation processes, adding for strong oxidizer may influence subsequent life
Change section processing.If PVA waste water directly with general dyeing waste water mixed processing when, be also easy to produce following problems：1, it mixes or is aerated
When generate a large amount of droplets；2, there is certain bio-toxicity, reduce active sludge treatment efficiency；3, higher COD and low B/C
Than increasing the burden of materializing strategy section；4, conventional coagulation-settlement process is ineffective to PVA waste water.
Summary of the invention
The present invention provides a kind of alcoholysis reaction and acetal to solve above-mentioned defect existing in the prior art and deficiency
Reaction is sufficiently thorough, and for acetate groups removal rate up to 99.9% or more, the formation speed of gel is fast, and makes gel group or particle, floats
In liquid surface, diameter is greater than 1cm, is easy to scrape slag removal, is collected into dross bucket, the removal rate of PVA is up to 80% or more, no
Influence subsequent treatment of dyeing wastewater, economic cost is reasonably printed and dyed PVA pretreatment method for wastewater.
Technical solution of the present invention：A kind of printing and dyeing PVA pretreatment method for wastewater, includes the following steps：
1, methanol solution is added in PVA waste water, reaction chamber water temperature is controlled at 80 ~ 90 DEG C by heating device, pH is controlled 7 ~ 9
Agitating device mixing speed is in 40 ~ 50r/min, and the control of control reaction time is brought it about adequately in 2 ~ 4h after reaching condition
Alcoholysis reaction；
2, continue to stir, temperature is down to 50 ~ 60 DEG C, and glutaraldehyde solution and hydrochloric acid are added in PVA waste water, and pH is controlled 5 ~ 7, reached
Reaction time control is controlled after condition in 6 ~ 8h, brings it about sufficient aldolisation；
3, stop stirring, the blast aeration into reactor by boring aeration pipe, aeration intensity is controlled in 0.5 ~ 1.5m3/min
100m3 water, until near 40 DEG C of water temperature hereinafter, water surface forms PVA gel group or particle；
4, start scum collector, PVA gel group or particle are struck off；
5, remaining sewage is discharged into conditioning tank and general dyeing waste water merging treatment, or 1 ~ 4 step of restarting, further removes
Remaining PVA.
Preferably, 99% or more methanol purity for the methanol solution being added in step 1, dosage 5%.
Preferably, following alcoholysis reaction occurs in step 1：-[-OOCCH3]n-+CH2OH→-[CH2CH(OH)]n-
+CH3COOH↑。
Preferably, the glutaraldehyde concentration 25% for the glutaraldehyde solution being added in step 2, dosage 0.5%.
Preferably, the concentration of hydrochloric acid for the hydrochloric acid solution being added in step 2 is 36%, dosage 5%.
Preferably, following aldolisation occurs in step 2：OHCC3H8OCHO+H+→OHC+C3H9OCHO-[CH2CH
(OH)]n-+ OHC+C3H9OCHO→-[H2C+OCH-CHOH-CH]n-+H2O-[H2C+OCH-CHOH-CH]n-→-
[-O-CH2-O-CH—-CH3-CH-]n-.
Advantages of the present invention is as follows：
1）The PVA of partial alcoholysis used in printing and dyeing contains more acetate groups, and the volume of the volume ratio hydroxyl of acetate groups is wanted
Much bigger, there is biggish steric hindrances, and minute bubbles is hindered to escape slurry surface, so that a large amount of white wadding bodies are formed in water,
Froth bed can be formed in slurry surface, influence wastewater treatment efficiency.The present invention makes PVA by adding methanol, control reaction condition
Sufficient alcoholysis reaction occurs, acetate groups removal rate avoids the generation of problem above up to 99.9% or more；
2）Glutaraldehyde and hydrochloric acid are added, gel reaction occurs for PVA, by blast aeration, accelerates cooling, improves the formation speed of gel
Degree, and make gel group or particle, floating on liquid surface, diameter is greater than 1cm, and it is easy to scrape slag removal, is collected into dross bucket,
The eyelet of dross bucket is less than gel group partial size, and filtrate can pass through, and dross bucket collects more dry gel group or particle；
3）Reaction through a cycle, up to 80% or more, remainder merges the PVA removed in waste water with general dyeing waste water
Processing also repeats step 1 ~ step 4 and further reacts；
4）The medicament that the present invention adds is ethyl alcohol, glutaraldehyde and hydrochloric acid, does not influence subsequent treatment of dyeing wastewater, and be to be easy to obtain
The chemicals obtained, economic cost are reasonable；
5）The present invention can complete reaction, gel and the removal of PVA waste water in a reaction chamber, convenient for making in enterprise
With.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail, but is not the limit to the scope of the present invention
System.
A kind of printing and dyeing PVA pretreatment method for wastewater, includes the following steps：
1, methanol solution is added in PVA waste water（99% or more methanol purity, dosage 5%）, controlled and reacted by heating device
Room water temperature is at 80 ~ 90 DEG C, and 7 ~ 9, control agitating device mixing speed reaches when controlling reaction after condition in 40 ~ 50r/min pH
Between control in 2 ~ 4h, following reaction occurs：-[-OOCCH3]n-+CH2OH→-[CH2CH(OH)]n-+CH3COOH↑；
2, continue to stir, temperature is down to 50 ~ 60 DEG C, and glutaraldehyde solution is added in PVA waste water（Glutaraldehyde concentration 25%, dosage are
0.5%）, hydrochloric acid（Concentration of hydrochloric acid is 36%, dosage 5%）, pH control is 5 ~ 7, and the control of control reaction time exists after reaching condition
Following aldolisation occurs for 6 ~ 8h：
OHCC3H8OCHO+H+→OHC+C3H9OCHO-[CH2CH(OH)]n-+ OHC+C3H9OCHO→-[H2C+OCH-
CHOH-CH]n-+H2O-[H2C+OCH-CHOH-CH]n-→-[-O-CH2-O-CH—-CH3-CH-]n-
3, stop stirring, the blast aeration into reactor by boring aeration pipe, aeration intensity is controlled in 0.5 ~ 1.5m3/min
100m3 water, until near 40 DEG C of water temperature hereinafter, water surface forms PVA gel group or particle；
4, start scum collector, PVA gel group or particle are struck off；
5, remaining sewage is discharged into conditioning tank and general dyeing waste water merging treatment, or 1 ~ 4 step of restarting, further removes
Remaining PVA.
Embodiment
The PVA waste water of certain enterprise, COD 3500mg/L, pH are 8.5 ~ 9.5.Steps are as follows for its PVA Wastewater Pretreatment：
1, PVA waste water is entered in reaction chamber by water inlet pipe, stops water inlet when reaching set amount；
2, methanol solution is added into reaction chamber（99% or more methanol purity, dosage 5%）, control mixing speed 40 ~
50r/min, controls reaction chamber water temperature at 80 ~ 90 DEG C, by pH control 7 ~ 9, reach after condition the control of control reaction time 2 ~
4h；
3, lasting stirring, temperature are down to 50 ~ 60 DEG C.Glutaraldehyde solution is added（Glutaraldehyde concentration 25%, dosage 0.5%）, add
Enter hydrochloric acid,（Concentration of hydrochloric acid is 36%, dosage 5%）, pH is controlled 5 ~ 7 by pH control system, is controlled after reaching condition
In 4 ~ 8h aldolisation occurs for reaction time control；
4, agitating device is closed, the blast aeration into reaction chamber controls aeration intensity in 0.5 ~ 1.5 m3/min 100m3
Water, until near 40 DEG C of water temperature hereinafter, water surface forms PVA gel group or particle, diameter is greater than 1cm；
4, start scum collector, PVA gel group or particle are struck off；
5, at this point, PVA removal rate is 80% or more, waste water COD is detected in 500mg/l or so, and remaining sewage is arranged by drainpipe
Enter conditioning tank and general dyeing waste water merging treatment, or 1 ~ 4 step of restarting, further removes remaining PVA.
Claims (6)
1. a kind of printing and dyeing PVA pretreatment method for wastewater, it is characterised in that：It includes the following steps：
1, methanol solution is added in PVA waste water, reaction chamber water temperature is controlled at 80 ~ 90 DEG C by heating device, pH is controlled 7 ~ 9
Agitating device mixing speed is in 40 ~ 50r/min, and the control of control reaction time is brought it about adequately in 2 ~ 4h after reaching condition
Alcoholysis reaction；
2, continue to stir, temperature is down to 50 ~ 60 DEG C, and glutaraldehyde solution and hydrochloric acid are added in PVA waste water, and pH is controlled 5 ~ 7, reached
Reaction time control is controlled after condition in 6 ~ 8h, brings it about sufficient aldolisation；
3, stop stirring, the blast aeration into reactor by boring aeration pipe, aeration intensity is controlled in 0.5 ~ 1.5m3/min
100m3 water, until near 40 DEG C of water temperature hereinafter, water surface forms PVA gel group or particle；
4, start scum collector, PVA gel group or particle are struck off；
5, remaining sewage is discharged into conditioning tank and general dyeing waste water merging treatment, or 1 ~ 4 step of restarting, further removes
Remaining PVA.
2. a kind of printing and dyeing PVA pretreatment method for wastewater according to claim 1, it is characterised in that：The first being added in step 1
99% or more the methanol purity of alcoholic solution, dosage 5%.
3. a kind of printing and dyeing PVA pretreatment method for wastewater according to claim 1, it is characterised in that：Occur in step 1 as follows
Alcoholysis reaction：-[-OOCCH3]n-+CH2OH→-[CH2CH(OH)]n-+CH3COOH↑.
4. a kind of printing and dyeing PVA pretreatment method for wastewater according to claim 1, it is characterised in that：Penta be added in step 2
The glutaraldehyde concentration 25% of dialdehyde solution, dosage 0.5%.
5. a kind of printing and dyeing PVA pretreatment method for wastewater according to claim 1, it is characterised in that：The salt being added in step 2
The concentration of hydrochloric acid of acid solution is 36%, dosage 5%.
6. a kind of printing and dyeing PVA pretreatment method for wastewater according to claim 1, it is characterised in that：Occur in step 2 as follows
Aldolisation：OHCC3H8OCHO+H+→OHC+C3H9OCHO
-[CH2CH(OH)]n-+ OHC+C3H9OCHO→-[H2C+OCH-CHOH-CH]n-+H2O-[H2C+OCH-
CHOH-CH]n-→-[-O-CH2-O-CH—-CH3-CH-]n-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810773614.1A CN108840479A (en) | 2018-07-15 | 2018-07-15 | A kind of printing and dyeing PVA pretreatment method for wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810773614.1A CN108840479A (en) | 2018-07-15 | 2018-07-15 | A kind of printing and dyeing PVA pretreatment method for wastewater |
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| Publication Number | Publication Date |
|---|---|
| CN108840479A true CN108840479A (en) | 2018-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810773614.1A Withdrawn CN108840479A (en) | 2018-07-15 | 2018-07-15 | A kind of printing and dyeing PVA pretreatment method for wastewater |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB862488A (en) * | 1959-07-27 | 1961-03-08 | Kurashiki Rayon Kk | Saponification apparatus and method |
| US4529775A (en) * | 1983-10-03 | 1985-07-16 | Air Products And Chemicals, Inc. | Method for increasing the low temperature water solubility and the sticking temperature of fully hydrolyzed polyvinyl alcohol |
| CN102173493A (en) * | 2011-03-08 | 2011-09-07 | 北京市环境保护科学研究院 | Process for removing polyvinyl alcohol in waste water |
| CN105347602A (en) * | 2014-08-19 | 2016-02-24 | 中国石油化工股份有限公司 | PVA wastewater biological treatment method |
| CN106279479A (en) * | 2015-06-09 | 2017-01-04 | 中国石油化工集团公司 | A kind of method improving product polyvinyl alcohol alcoholysis degree |
-
2018
- 2018-07-15 CN CN201810773614.1A patent/CN108840479A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB862488A (en) * | 1959-07-27 | 1961-03-08 | Kurashiki Rayon Kk | Saponification apparatus and method |
| US4529775A (en) * | 1983-10-03 | 1985-07-16 | Air Products And Chemicals, Inc. | Method for increasing the low temperature water solubility and the sticking temperature of fully hydrolyzed polyvinyl alcohol |
| CN102173493A (en) * | 2011-03-08 | 2011-09-07 | 北京市环境保护科学研究院 | Process for removing polyvinyl alcohol in waste water |
| CN105347602A (en) * | 2014-08-19 | 2016-02-24 | 中国石油化工股份有限公司 | PVA wastewater biological treatment method |
| CN106279479A (en) * | 2015-06-09 | 2017-01-04 | 中国石油化工集团公司 | A kind of method improving product polyvinyl alcohol alcoholysis degree |
Non-Patent Citations (1)
| Title |
|---|
| З.И.巴尔格: "《合成塑料工艺学》", 31 January 1962, 中国工业出版社 * |
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Application publication date: 20181120 |