CN111499036B - PVA-containing desizing wastewater and dyeing wastewater combined treatment method - Google Patents
PVA-containing desizing wastewater and dyeing wastewater combined treatment method Download PDFInfo
- Publication number
- CN111499036B CN111499036B CN202010316084.5A CN202010316084A CN111499036B CN 111499036 B CN111499036 B CN 111499036B CN 202010316084 A CN202010316084 A CN 202010316084A CN 111499036 B CN111499036 B CN 111499036B
- Authority
- CN
- China
- Prior art keywords
- wastewater
- pva
- dyeing
- desizing
- dyeing wastewater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C02F1/52—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
- C02F1/66—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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
Abstract
The invention provides a method for combining PVA-containing desizing wastewater and dyeing wastewater. The method comprises the following steps: mixing dyeing wastewater and desizing wastewater containing PVA; adjusting the pH value of the mixed wastewater; adding a flocculating agent into the wastewater after the pH is adjusted, and stirring until alum floc appears; and adding a cross-linking agent into the wastewater after the flocculation treatment, and stirring until aggregates are separated out, thereby completing the combination treatment of the PVA-containing desizing wastewater and the dyeing wastewater. The method for combining the PVA-containing desizing wastewater and the dyeing wastewater can simultaneously treat the dyeing wastewater and the PVA-containing desizing wastewater.
Description
Technical Field
The invention relates to a wastewater treatment method, in particular to a combined treatment method of PVA-containing desizing wastewater and dyeing wastewater, belonging to the technical field of wastewater treatment.
Background
PVA (polyvinyl alcohol) is a high molecular compound with water activity, and is widely applied to the sizing procedure in the textile industry due to the characteristics of excellent film forming property, adhesion, easy compatibility with other sizing agents and the like. Meanwhile, each gram of PVA contributes about 0.1g of BOD and 1.84g of COD, belongs to typical refractory substances, and can be accumulated in the environment after being discharged into a water body, so that the reoxygenation behavior of the water body is influenced, and the problem of serious water environment pollution is caused.
The desizing process is mainly to remove the sizing agent added on the warp in the weaving process, so that the fabric recovers the original affinity to meet the subsequent dyeing and finishing requirements. The desizing wastewater generated in the process contains a large amount of sizing agents such as PVA, starch and the like, the COD value can reach 20000mg/L, the treatment difficulty is high, and the PVA treatment efficiency by common coagulation sedimentation and biochemical treatment is extremely low. Desizing wastewater accounts for about 15% of the total wastewater volume, but its contaminants account for more than half of the total contaminants.
The dyeing of cotton, hemp and viscose is usually reactive dyeing, and during the dyeing process, dye, anhydrous sodium sulphate and soda ash with higher concentration are required to be added, especially for extra dark color fabrics. Therefore, the dyeing wastewater is wastewater with high chroma and high electrolyte concentration, and the main pollutant is dye. The dyeing wastewater is one of the important sources of water pollution due to higher chroma. Meanwhile, the dyeing wastewater belongs to industrial wastewater which is difficult to treat.
Disclosure of Invention
In order to solve the above-mentioned problems, an object of the present invention is to provide a treatment method capable of treating dyeing wastewater and PVA-containing desizing wastewater simultaneously.
In order to achieve the above technical object, the present invention firstly provides a combined treatment method of PVA-containing desizing wastewater and dyeing wastewater, the method comprising:
mixing dyeing wastewater and desizing wastewater containing PVA;
adjusting the pH value of the mixed wastewater;
adding a flocculating agent into the wastewater after the pH is adjusted, and stirring until alum floc appears, wherein the addition amount of the flocculating agent is 0.5-5 g/L;
and adding a cross-linking agent into the wastewater after the flocculation treatment, and stirring until aggregates are separated out, wherein the addition amount of the cross-linking agent is 1-2 g/L, so that the combination treatment of the PVA-containing desizing wastewater and the dyeing wastewater is completed.
The wastewater treatment method provided by the invention combines the characteristics of dyeing wastewater and desizing wastewater, and realizes the purpose of treating the two types of wastewater by using waste through combined treatment.
The treatment method of the present invention comprises a step of mixing dyeing wastewater and PVA-containing desizing wastewater.
The dyeing wastewater of the invention can be first vat residual liquid discharged after the cellulose is dyed by reactive dye, and contains anhydrous sodium sulphate and sodium carbonate. In one embodiment of the invention, the content of sodium sulfate in the dyeing wastewater is 50g/L-100g/L, and the content of sodium carbonate is 10g/L-30 g/L.
The PVA-containing desizing wastewater of the invention can be high-concentration wastewater discharged from the hot water desizing process of the woven fabric. In one embodiment of the invention, the PVA-containing desizing wastewater is neutral or weakly acidic, and the content of PVA is 2g/L-12 g/L.
In one embodiment of the present invention, the mixing volume ratio of the dyeing wastewater to the PVA-containing desizing wastewater is 1:3 to 1: 8. Further, the sodium sulfate concentration after mixing may be 10g/L or more.
The treatment method of the invention comprises the step of adjusting the pH of the mixed wastewater. The proper acid-base conditions are adjusted to make the pH value after flocculation suitable for the salting-out reaction of PVA.
In one embodiment of the present invention, the pH of the mixed wastewater may be adjusted by a combination of one or more of sulfuric acid, hydrochloric acid, and acetic acid. Specifically, the pH of the mixed wastewater is adjusted to 9 to 10.5.
The treatment method comprises the step of adding a flocculating agent into the wastewater after the pH is adjusted. Under alkaline conditions, the flocculating agent forms flocs which have the function of adsorption and sedimentation on dyes.
In one embodiment of the present invention, the flocculant used may be an inorganic flocculant, such as a combination of one or more of ferrous salt, calcium salt, and magnesium salt.
In a specific embodiment of the invention, the stirring time after the flocculant is added is 0.5min to 5 min.
The treatment method comprises the step of adding a cross-linking agent into the wastewater after flocculation treatment. PVA forms a bi-diol structure under the action of a cross-linking agent, is cross-linked into gel and is separated out under the dehydration action of anhydrous sodium sulphate; meanwhile, the floccule generated by the flocculating agent is wrapped in the process of PVA crosslinking and precipitation to form a coprecipitation substance.
In a specific embodiment of the present invention, the crosslinking agent used is borax. The stirring time after adding the cross-linking agent is 15min-30 min.
In the method for combining and treating the PVA-containing desizing wastewater and the dyeing wastewater, the PVA-containing desizing wastewater and the dyeing wastewater interact, the alkali of the dyeing wastewater provides an alkaline condition for flocculation, the electrolyte in the dyeing wastewater is used as a salting-out agent for PVA coagulation, and gel formed by crosslinking the PVA in the desizing wastewater can be used as a coagulant aid for flocculation and decoloration.
The method for combining and treating PVA-containing desizing wastewater and dyeing wastewater saves the investment of salting-out agent and coagulant aid on the basis of ensuring that the PVA removal rate is more than 90% and the dye removal rate is more than 95%, thereby achieving the purpose of treating wastes with processes of wastes against one another.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Example 1
Collecting dyeing wastewater, wherein the chroma of the dyeing wastewater is 6400 times, and the dyeing wastewater contains 70g/L of sodium sulfate and 20g/L of sodium carbonate. The desizing wastewater was collected at a PVA concentration of 6365 mg/L.
Mixing the dyeing wastewater and the desizing wastewater in a volume ratio of 1:4 to obtain mixed wastewater, wherein the chroma is 1600 times, the PVA concentration is 5092mg/L, and the pH value is 10.56.
Hydrochloric acid was added to 1L of the mixed wastewater to adjust the pH to 10.01. Slowly adding 20% ferrous sulfate solution dropwise with the addition amount of about 12mL, adding the ferrous sulfate solution while stirring, and continuing to stir slowly for 5min after alum floc appears.
Weighing 1.5g of borax, and hydrating with 5mL of water to obtain borax solution. And (3) adding the borax solution into the mixed solution, and stirring for 30min until gel is separated out.
The supernatant was separated and found to have a color intensity of 64 times and a PVA concentration of 394 mg/L. The chroma removal rate is 96 percent, and the PVA interception rate is 92.3 percent.
Example 2
Dyeing wastewater and desizing wastewater were collected as in example 1. The chroma of the dyeing wastewater is 6400 times, and the dyeing wastewater contains 90g/L of sodium sulfate and 25g/L of sodium carbonate. The PVA concentration of the desizing wastewater is 9050 mg/L.
The dyeing wastewater and the desizing wastewater are mixed according to the volume ratio of 1:8, and the chroma of the mixed wastewater is 1600 times, the PVA concentration is 8030mg/L, and the pH value is 10.67.
1L of mixed wastewater is taken, and 10% sulfuric acid is added to adjust the pH value to 10.2. 15mL of 20% ferrous chloride solution is slowly added, and stirring is carried out while adding the ferrous chloride. And after the ferrous chloride is added, continuously and slowly stirring for 5 min.
2g of borax is weighed and dissolved by a small amount of clear water. And adding the borax solution into the mixed wastewater subjected to the flocculation and decoloration in the previous step, and stirring for about 20min until gel is separated out.
The supernatant was separated and found to have a 64-fold color and a PVA concentration of 330 mg/L. The final chroma removal rate was 96% and the PVA removal rate was 95.9%.
Comparative example 1
200mL of the dyeing wastewater obtained in example 1 was taken and added with 800mL of clear water, and the chroma was 1600 times. Hydrochloric acid is firstly dropped to adjust the pH value to 10.00, then 12mL of 20% ferrous sulfate solution is added, and the mixture is stirred for 5 min. Finally, 1mg/L of anionic PAM is added for coagulation assistance.
The supernatant was separated and the chroma was found to be 64 times, with a chroma removal of 96%.
Comparative example 2
800mL of the desizing wastewater of example 1 was taken and added to 200mL of clear water, and the PVA concentration was measured to be 5100 mg/L. Adding 1.5g/L borax, stirring for 1min, adding 15g/L sodium sulfate, and stirring for 30 min.
The supernatant was separated, and the PVA concentration was found to be 352mg/L, with a PVA removal rate of 93.1%.
The above comparative examples 1 and 2 are the treatment effect of the conventional flocculation decoloring method and the treatment effect of the boron salt salting-out method commonly used for treating PVA wastewater, respectively. The comparison shows that the method provided by the invention combines the dyeing wastewater and the desizing wastewater to treat the dyeing wastewater and the desizing wastewater to achieve the purpose of treating the dyeing wastewater by using waste, simultaneously the removal rate of PVA and dye can still reach the level when the PVA and dye are treated separately, and the investment of reagents such as salting-out agent, coagulant aid and the like is saved.
Comparative example 3
The dyeing wastewater and desizing wastewater of example 1 were taken and mixed in a ratio of 1: 10, and mixing. The color of the mixed wastewater was 1600 times, the PVA concentration was 5800mg/L, and the pH was 10.3.
Hydrochloric acid was added to 1L of the mixed wastewater to adjust the pH to 10.01. Slowly adding 20% ferrous sulfate solution dropwise with the addition amount of about 12mL, adding the ferrous sulfate solution while stirring, and continuing to stir slowly for 5min after alum floc appears.
Weighing 1.5g of borax, and hydrating with 5mL of water to obtain borax solution. And (3) adding the borax solution into the mixed solution, and stirring for 30min until gel is separated out.
The supernatant was separated and found to have a 64-fold chroma and a PVA concentration of 1030 mg/L. The chroma removal rate is 96 percent, and the PVA interception rate is 82.24 percent. The proportion of dyeing wastewater is reduced, and the salting-out efficiency of PVA is reduced due to the excessively low salt content of the mixed wastewater.
Comparative example 4
The operation was the same as in example 1, except that the pH of the waste water after mixing was adjusted to 8.5. And finally, the effluent chroma removal rate is 84%, and the PVA interception rate is 87.23%. The mixed wastewater is adjusted to a lower pH value, and the treatment efficiency of the dye and PVA is reduced.
Comparative example 5
The operation was the same as in example 1, except that the pH of the waste water after mixing was adjusted to 11. Finally, the chroma removal rate of the effluent is 96 percent, and the PVA removal rate is 88 percent. The pH of the mixed wastewater is too high, and the PVA treatment efficiency is reduced.
Claims (4)
1. A combined treatment method of PVA-containing desizing wastewater and dyeing wastewater comprises the following steps:
mixing dyeing wastewater and PVA-containing desizing wastewater, wherein the mixing volume ratio of the dyeing wastewater to the PVA-containing desizing wastewater is 1:3-1:8, the content of sodium sulfate in the dyeing wastewater is 50g/L-100g/L, the content of sodium carbonate is 10g/L-30g/L, the PVA-containing desizing wastewater is neutral or weakly acidic, and the content of PVA is 2g/L-12 g/L;
adjusting the pH value of the mixed wastewater to 9-10.5;
adding a flocculating agent into the wastewater after the pH value is adjusted, and stirring until alum flocs appear, wherein the addition amount of the flocculating agent is 0.5-5 g/L; the flocculating agent is ferrous salt;
and adding a cross-linking agent into the wastewater after the flocculation treatment, and stirring until aggregates are separated out, wherein the addition amount of the cross-linking agent is 1-2 g/L, so as to complete the combination treatment of the PVA-containing desizing wastewater and the dyeing wastewater, wherein the cross-linking agent is borax.
2. The method of claim 1, wherein the pH of the mixed wastewater is adjusted by a combination of one or more of sulfuric acid, hydrochloric acid, acetic acid.
3. The method of claim 1, wherein the time for stirring after adding the flocculant is from 0.5min to 5 min.
4. The method of claim 1, wherein the stirring time after adding the cross-linking agent is 15min to 30 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010316084.5A CN111499036B (en) | 2020-04-21 | 2020-04-21 | PVA-containing desizing wastewater and dyeing wastewater combined treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010316084.5A CN111499036B (en) | 2020-04-21 | 2020-04-21 | PVA-containing desizing wastewater and dyeing wastewater combined treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111499036A CN111499036A (en) | 2020-08-07 |
| CN111499036B true CN111499036B (en) | 2022-05-13 |
Family
ID=71876274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010316084.5A Active CN111499036B (en) | 2020-04-21 | 2020-04-21 | PVA-containing desizing wastewater and dyeing wastewater combined treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111499036B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112062247B (en) * | 2020-09-14 | 2021-12-10 | 东华大学 | Precipitation separation method of high-concentration dyeing residual liquid |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR920009710A (en) * | 1990-11-22 | 1992-06-25 | 요시레루 산도오 | Discoloration treatment method of discharge liquid |
| KR19980085024A (en) * | 1997-05-27 | 1998-12-05 | 이대원 | Dye wastewater treatment method containing polyvinyl alcohol (PVA) by electron beam irradiation |
| CN101955282A (en) * | 2010-10-18 | 2011-01-26 | 江苏省环境科学研究院 | Method for realizing zero emission of dyeing wastewater with high salinity in printing and dyeing enterprises |
| CN108314216A (en) * | 2018-03-07 | 2018-07-24 | 南通市环境工程设计院有限公司 | The method that low-cost processes recycle PVA in desized wastewater |
| CN109467224A (en) * | 2018-12-29 | 2019-03-15 | 广东溢达纺织有限公司 | A kind of recyclable device and method of dyeing residual liquid |
| CN109926026A (en) * | 2019-04-03 | 2019-06-25 | 黎明职业大学 | A kind of ion-exchange type decolorizing printing and dyeing waste water gel mould and preparation method thereof |
-
2020
- 2020-04-21 CN CN202010316084.5A patent/CN111499036B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR920009710A (en) * | 1990-11-22 | 1992-06-25 | 요시레루 산도오 | Discoloration treatment method of discharge liquid |
| JPH04190892A (en) * | 1990-11-22 | 1992-07-09 | Sando Iron Works Co Ltd | Decoloring method for waste liquid |
| US5180497A (en) * | 1990-11-22 | 1993-01-19 | Sando Iron Works Co., Ltd. | Method for decolorization of waste water |
| KR19980085024A (en) * | 1997-05-27 | 1998-12-05 | 이대원 | Dye wastewater treatment method containing polyvinyl alcohol (PVA) by electron beam irradiation |
| CN101955282A (en) * | 2010-10-18 | 2011-01-26 | 江苏省环境科学研究院 | Method for realizing zero emission of dyeing wastewater with high salinity in printing and dyeing enterprises |
| CN108314216A (en) * | 2018-03-07 | 2018-07-24 | 南通市环境工程设计院有限公司 | The method that low-cost processes recycle PVA in desized wastewater |
| CN109467224A (en) * | 2018-12-29 | 2019-03-15 | 广东溢达纺织有限公司 | A kind of recyclable device and method of dyeing residual liquid |
| CN109926026A (en) * | 2019-04-03 | 2019-06-25 | 黎明职业大学 | A kind of ion-exchange type decolorizing printing and dyeing waste water gel mould and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 退浆废水中聚乙烯醇的回收;郭丽等;《石油化工腐蚀与防护》;20071231;第24卷(第6期);第59-61页 * |
| 退浆废水的多级膜浓缩及其与染色废水的联合处理;陈洪腾;《中国优秀硕士学位论文全文数据库•工程科技I辑》;20190615;第B027-298 页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111499036A (en) | 2020-08-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109292933B (en) | COD (chemical oxygen demand) remover with oxidation and flocculation combined function for sewage treatment | |
| Brower et al. | Economical pretreatment for color removal from textile dye wastes | |
| CN105727902A (en) | Adsorption composition for treating textile wastewater | |
| CN105692952B (en) | The processing method of textile waste | |
| CN111499036B (en) | PVA-containing desizing wastewater and dyeing wastewater combined treatment method | |
| CN112390321B (en) | Phosphorus removal agent for sewage treatment and preparation method thereof | |
| CN104276641A (en) | Flocculating agent for textile printing and dyeing wastewater | |
| CN1156409C (en) | Treatment method of textile printing industry effluent | |
| CN103466731A (en) | Fiber radical sewage decoloration and purification material and preparing method thereof | |
| CN104787864B (en) | A kind of preparation method of the composite decoloration flocculant for treatment of dyeing wastewater | |
| CN110937762B (en) | PVA-containing desizing printing and dyeing wastewater pretreatment method | |
| CN105084481A (en) | Dyeing wastewater treating agent and preparing method thereof | |
| CN101525193A (en) | Processing method for printing and dyeing waste water recycling | |
| Wang et al. | Color removal from textile industry wastewater using composite flocculants | |
| US4025429A (en) | Process for the purification of industrial effluent | |
| JP2933627B2 (en) | Sludge dewatering method | |
| CN105776481B (en) | Double modified stalk fiber treatment of dyeing/printing wastewaters of xanthate cation and preparation method thereof | |
| CN105692826A (en) | Flocculating agent composition for treating textile wastewater and using method thereof | |
| CN104291424A (en) | Flocculating agent for textile sewage | |
| CN106587296A (en) | Bamboo pulp cellulose based flocculation decolorization composite functional material and preparation method thereof | |
| CN113896306B (en) | Polymeric aluminum ferric chloride flocculant and preparation method thereof | |
| JPS5949078B2 (en) | Sludge treatment method | |
| CN105692859B (en) | Strong oxidizer and its application | |
| KR100374148B1 (en) | Treatment of wastewater generated in the paper preparation process | |
| US4088573A (en) | Method for clarifying aqueous waste liquids containing acid dyes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |