CN102951756A - Method for treating alkaline printing and dyeing wastewater by utilizing waste acid - Google Patents
Method for treating alkaline printing and dyeing wastewater by utilizing waste acid Download PDFInfo
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- CN102951756A CN102951756A CN2012104972978A CN201210497297A CN102951756A CN 102951756 A CN102951756 A CN 102951756A CN 2012104972978 A CN2012104972978 A CN 2012104972978A CN 201210497297 A CN201210497297 A CN 201210497297A CN 102951756 A CN102951756 A CN 102951756A
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Abstract
The invention relates to a treatment process of industrial wastewater, in particular to a method for treating alkaline printing and dyeing wastewater by utilizing waste acid. The method comprises the following steps of: 1), measuring the pH value of the alkaline printing and dyeing wastewater, and ensuring that the pH value is between 11 and 13; 2), adding a waste acid decoloring agent to carry out decoloring treatment; 3), adding a flocculating agent, standing and precipitating to obtain supernatant fluid and sludge; 4), adding an industrial sodium hypochlorite solution and the flocculating agent to the supernatant fluid to further treat the obtained supernatant fluid; and 5), discharging and dewatering the sludge to obtain dewatered sludge and clear water, discharging the sludge, returning the clear water to the first step, mixing the clear water with the alkaline printing and dyeing wastewater to treat again. The method provided by the invention is simple in treatment procedure, and is easy to operate; the pH value of the treated clear water is in the range of 6-9; the pH value does not need to be further adjusted, so that the clear water can be recycled again in a printing and dyeing washing production line for utilization; and the dosage of the acid is saved.
Description
Technical field
The present invention relates to technique for treating industrial wastewater, particularly a kind of method of utilizing spent acid to process waste water of basic printing and dyeing.
Background technology
Dyeing waste water refers to the waste water that cotton, hair, fiber crops, silk, chemical fibre or blending product are discharged in the processes such as pre-treatment, dyeing, stamp and arrangement.Dyeing waste water has the characteristics such as the water yield is large, organic pollutant content is high, colourity is dark, alkalescence is large, change of water quality is large, belongs to unmanageable trade effluent.The treatment process of dyeing waste water mainly contains four kinds, physical treatment process, method of chemical treatment, biological treatment, alkali decrement treatment method.
The dyeing waste water biological degradability is poor, the decolouring difficulty, and whether effectively the decolorizing effect of dyeing waste water is to estimate method of wastewater treatment one of key index.Processing approach commonly used is the flocculation reflocculation, the biochemical more passive treatment process of biochemistry, the project occupation of land area is large, long flow path, capital construction and working cost is high, treatment effect is unstable, because present dyeing medium is take water as main, so most dyestuffs are all soluble in water, and because the dye molecule quality is larger, most dyestuffs can both form lyophilic colloid in water, so that the decolouring of the routine of dyeing waste water becomes very difficult, therefore, need to take more economically effectively decoloring method and the organic techniques of Dyeing Wastewater Treatment of removal bio-refractory.
The conventional treatment method of dyeing waste water generally is divided into biochemistry+materialization and materialization+biochemistry two large class treatment process, but owing to lack the acidication unit, exists the aerobic biochemical unit process thorough not in the actual motion, causes the higher problem of follow-up materialization processing costs.Before traditional aerobe treatment unit, increase " hydrolysis+aerobic " series winding technique that acidication is processed, can make that the organism of hard degradation is hydrolyzed in the dyeing waste water, be generated as the material than readily biodegradable, improve the biodegradable of waste water, thereby improve the COD clearance of traditional process.At present domestic many newly-built printing and dyeing wastewater processing equipments (comprising that sanitary sewage and dyeing waste water focus on) all adopt " the be hydrolyzed one aerobic " biological treatment by this process exploitation, obvious environmental benefit and economic benefit have been obtained, but this technique also needs to carry out subsequent disposal, just can make water outlet reach reuse standard.
Summary of the invention
The invention provides a kind of method of utilizing spent acid to process waste water of basic printing and dyeing, it is poor that it has solved the printing-dyeing waste water treatment process degradation property, exist the aerobic biochemical unit process thorough not in decolouring difficulty and the actual motion, cause the problems such as follow-up materialization processing costs is higher.
The technical solution adopted in the present invention is: a kind of method of utilizing spent acid to process waste water of basic printing and dyeing may further comprise the steps:
1) waste water of basic printing and dyeing is carried out the pH pH-value determination pH, and adjust the pH value between 11 ~ 13;
2) will adjust the waste water of pH value, according to the chemical feeding quantity of 3 of waste water weight ~ 8 ‰, add the spent acid discoloring agent, the processing of decolouring;
3) will decolour waste water after processing according to the chemical feeding quantity of 0.3 ~ 1.5ppm, add flocculation agent, staticly settle 10 ~ 30min, obtain supernatant liquor and mud;
4) supernatant liquor that the 3rd step was obtained, at first the dosage according to 3 of waste water weight ~ 8 ‰ adds industrial chlorine bleach liquor, further unnecessary iron ion and a small amount of staining agent in the oxidized waste water, then the chemical feeding quantity according to 0.3 ~ 1.5ppm adds flocculation agent, mixed flocculation, carrying out secondary staticly settles, the supernatant liquor that obtains after the precipitation at last is back to use printing and dyeing washing production line again through after the assay was approved, the a small amount of mud mud that obtains after the precipitation is discharged dehydration, obtain dewatered sludge and clear water, mud is discharged, and clear water got back to for the 1st step, mix with waste water of basic printing and dyeing, again process;
5) the mud discharge dehydration that the 3rd step was obtained obtains dewatered sludge and clear water, and mud is discharged, and clear water got back to for the 1st step, and waste water of basic printing and dyeing mixes again processing.
Preferred version of the present invention: described spent acid discoloring agent is spent pickle liquor, moiety comprise content of hydrochloric acid be 1mol/L, with Fe
2+The content of total iron of meter is 80.8g/L.
Preferred version of the present invention: the addition of described spent acid discoloring agent is 5 ‰.
Preferred version of the present invention: described flocculation agent is polyacrylamide, can improve flocculating effect.
Preferred version of the present invention: the addition of flocculation agent is 1ppm in described the 3rd step.
Preferred version of the present invention: the addition of flocculation agent is 1ppm in described the 4th step.
Preferred version of the present invention: described industrial chlorine bleach liquor's available chlorine content is 10%.
Of the present inventionly adopted above technical scheme, made it have following advantage:
1, designed the new technological flow that uses spent acid discoloring agent processing waste water of basic printing and dyeing.
The conventional treatment method of dyeing waste water generally is divided into biochemistry+materialization and materialization+biochemistry two large class treatment process, but owing to lack the acidication unit, exists the aerobic biochemical unit process thorough not in the actual motion, causes the higher problem of follow-up materialization processing costs.This art breading flow process is simple, and is easy to operate.
2, save acid, alkali reagent cost
Waste water of basic printing and dyeing is according to traditional treatment method, need to adjust the pH value to former water with acid, increase cost of equipment and reagent cost, the waste water ph that initially begins to process of method of the present invention is between 11 ~ 13, basically the pH value with waste water of basic printing and dyeing is consistent, need not consume a large amount of acid.
Traditional method materialization partly uses polymerize aluminum chloride and polyacrylamide to carry out decolorization flocculation, pharmaceutical quantities is larger, this technique, adopt some Electroplate Factories, the spent pickle liquor of the metal parts device fabrication factories such as apparatus source mill is as discoloring agent, with low cost on the one hand, on the one hand dyeing waste water is had splendid decolorizing effect.
Clear water pH value after the processing need not further to adjust the pH value in 6 ~ 9 scope, can again be back to use the utilization of printing and dyeing washing production line, saves sour consumption.
3, save the clean water resource
Treated water, COD clearance about 80%, chroma removal rate are more than 85%, and total iron content has 130mg/L to reduce to 0.45mg/L, after the check, can again be back to use dyeing and printing process, has saved to a certain extent water resources.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
As shown in Figure 1, a kind of method of utilizing spent acid to process waste water of basic printing and dyeing may further comprise the steps:
1) waste water of basic printing and dyeing enters equalizing tank and carries out the pH pH-value determination pH, and adjusts the pH value, guarantees the pH value between 11 ~ 13, and the pH value is crossed when hanging down, and spent acid discoloring agent action effect is not obvious.
2) waste water that will adjust the pH value is transported to settling tank by pipeline from equalizing tank, in the equalizing tank outlet conduit, according to waste water weight 3 ~ 8 ‰, adds the spent acid discoloring agent, and waste water and spent acid discoloring agent are mixed in pipeline.If decolorizing effect is bad, can prolong the mixing time of discoloring agent and waste water, increase mixed effect.
3) waste water after decolouring enters in the pipeline of settling tank, according to the chemical feeding quantity of 0.3 ~ 1.5ppm, adds flocculation agent, staticly settles 10 ~ 30min, obtains supernatant liquor and mud.
4) water collecting basin in the middle of the supernatant liquor that the 3rd step was obtained at first is transported to by pipeline from settling tank, dosage according to waste water weight 3 ~ 8 ‰ in transport pipe adds industrial chlorine bleach liquor, water collecting basin in the middle of entering after chlorine bleach liquor and supernatant liquor are fully mixed in pipeline, further unnecessary iron ion and a small amount of staining agent in the oxidized waste water; The supernatant liquor of unnecessary iron ion and a small amount of staining agent is transported to secondary sedimentation basins by pipeline from middle water collecting basin in the further oxidized waste water that then will pass through, chemical feeding quantity according to 0.3 ~ 1.5ppm in transport pipe adds flocculation agent, enter secondary sedimentation basins after flocculation agent and supernatant liquor are fully mixed in pipeline, carry out secondary and staticly settle; The supernatant liquor that obtains after the precipitation at last enters clean water basin, and through can again being back to use printing and dyeing washing production line after the assay was approved, a small amount of mud that obtains after the precipitation enters sludge sump;
5) mud that the 3rd step was obtained enters sludge sump, then the mud in the sludge sump is carried out processed, and the mud after the dehydration is discharged, and the clear water that dehydration obtains enters settling tank, re-starts processing.
Described spent acid discoloring agent is spent pickle liquor, is some Electroplate Factories, the spent pickle liquor of the metal parts device fabrication factories such as apparatus source mill, and moiety comprises: the content of hydrochloric acid is that the content of 1mol/L, total iron is 80.8g/L.
The addition of described spent acid discoloring agent is 5 ‰.
Described flocculation agent is polyacrylamide, can improve flocculating effect.
The addition of flocculation agent is 1ppm in described the 3rd step.
The addition of flocculation agent is 1ppm in described the 4th step.
Described industrial chlorine bleach liquor's available chlorine content is 10%.
Embodiment 1
A kind of method of utilizing spent acid to process waste water of basic printing and dyeing may further comprise the steps:
1) waste water of basic printing and dyeing enters equalizing tank and carries out the pH pH-value determination pH, and adjusts the pH value, guarantees the pH value between 11 ~ 13, and the pH value is crossed when hanging down, and spent acid discoloring agent action effect is not obvious.
2) waste water that will adjust the pH value is transported to settling tank by pipeline from equalizing tank, in the equalizing tank outlet conduit, according to the chemical feeding quantity of waste water weight 3 ‰, adds spent pickle liquor, and waste water and spent acid discoloring agent are mixed in pipeline.If decolorizing effect is bad, can prolong the mixing time of discoloring agent and waste water, increase mixed effect.
3) waste water after decolouring enters in the pipeline of settling tank, according to the chemical feeding quantity of 0.3ppm, adds polyacrylamide, staticly settles 10 ~ 30min, obtains supernatant liquor and mud.
4) water collecting basin in the middle of the supernatant liquor that the 3rd step was obtained at first is transported to by pipeline from settling tank, dosage according to waste water weight 5 ‰ in transport pipe adds industrial chlorine bleach liquor, water collecting basin in the middle of entering after chlorine bleach liquor and supernatant liquor are fully mixed in pipeline, further unnecessary iron ion and a small amount of staining agent in the oxidized waste water; The supernatant liquor of unnecessary iron ion and a small amount of staining agent is transported to secondary sedimentation basins by pipeline from middle water collecting basin in the further oxidized waste water that then will pass through, chemical feeding quantity according to 1ppm in transport pipe adds polyacrylamide, enter secondary sedimentation basins after polyacrylamide and supernatant liquor are fully mixed in pipeline, carry out secondary and staticly settle; The supernatant liquor that obtains after the precipitation at last enters clean water basin, and through can again being back to use printing and dyeing washing production line after the assay was approved, a small amount of mud that obtains after the precipitation enters sludge sump;
5) mud that the 3rd step was obtained enters sludge sump, then the mud in the sludge sump is carried out processed, and the mud after the dehydration is discharged, and the clear water that dehydration obtains enters settling tank, re-starts processing.
Embodiment 2
A kind of method of utilizing spent acid to process waste water of basic printing and dyeing may further comprise the steps:
1) waste water of basic printing and dyeing enters equalizing tank and carries out the pH pH-value determination pH, and adjusts the pH value, guarantees the pH value between 11 ~ 13, and the pH value is crossed when hanging down, and spent acid discoloring agent action effect is not obvious.
2) waste water that will adjust the pH value is transported to settling tank by pipeline from equalizing tank, in the equalizing tank outlet conduit, according to the chemical feeding quantity of waste water weight 5 ‰, adds spent pickle liquor, and waste water and spent acid discoloring agent are mixed in pipeline.If decolorizing effect is bad, can prolong the mixing time of discoloring agent and waste water, increase mixed effect.
3) waste water after decolouring enters in the pipeline of settling tank, according to the chemical feeding quantity of 1ppm, adds polyacrylamide, staticly settles 10 ~ 30min, obtains supernatant liquor and mud.
4) water collecting basin in the middle of the supernatant liquor that the 3rd step was obtained at first is transported to by pipeline from settling tank, dosage according to waste water weight 3 ‰ in transport pipe adds industrial chlorine bleach liquor, water collecting basin in the middle of entering after chlorine bleach liquor and supernatant liquor are fully mixed in pipeline, further unnecessary iron ion and a small amount of staining agent in the oxidized waste water; The supernatant liquor of unnecessary iron ion and a small amount of staining agent is transported to secondary sedimentation basins by pipeline from middle water collecting basin in the further oxidized waste water that then will pass through, chemical feeding quantity according to 1.5ppm in transport pipe adds polyacrylamide, enter secondary sedimentation basins after polyacrylamide and supernatant liquor are fully mixed in pipeline, carry out secondary and staticly settle; The supernatant liquor that obtains after the precipitation at last enters clean water basin, and through can again being back to use printing and dyeing washing production line after the assay was approved, a small amount of mud that obtains after the precipitation enters sludge sump;
5) mud that the 3rd step was obtained enters sludge sump, then the mud in the sludge sump is carried out processed, and the mud after the dehydration is discharged, and the clear water that dehydration obtains enters settling tank, re-starts processing.
Embodiment 3
A kind of method of utilizing spent acid to process waste water of basic printing and dyeing may further comprise the steps:
1) waste water of basic printing and dyeing enters equalizing tank and carries out the pH pH-value determination pH, and adjusts the pH value, guarantees the pH value between 11 ~ 13, and the pH value is crossed when hanging down, and spent acid discoloring agent action effect is not obvious.
2) waste water that will adjust the pH value is transported to settling tank by pipeline from equalizing tank, in the equalizing tank outlet conduit, according to the chemical feeding quantity of waste water weight 8 ‰, adds spent pickle liquor, and waste water and spent acid discoloring agent are mixed in pipeline.If decolorizing effect is bad, can prolong the mixing time of discoloring agent and waste water, increase mixed effect.
3) waste water after decolouring enters in the pipeline of settling tank, according to the chemical feeding quantity of 1.5ppm, adds polyacrylamide, staticly settles 10 ~ 30min, obtains supernatant liquor and mud.
4) water collecting basin in the middle of the supernatant liquor that the 3rd step was obtained at first is transported to by pipeline from settling tank, dosage according to waste water weight 8 ‰ in transport pipe adds industrial chlorine bleach liquor, water collecting basin in the middle of entering after chlorine bleach liquor and supernatant liquor are fully mixed in pipeline, further unnecessary iron ion and a small amount of staining agent in the oxidized waste water; The supernatant liquor of unnecessary iron ion and a small amount of staining agent is transported to secondary sedimentation basins by pipeline from middle water collecting basin in the further oxidized waste water that then will pass through, chemical feeding quantity according to 0.3ppm in transport pipe adds polyacrylamide, enter secondary sedimentation basins after polyacrylamide and supernatant liquor are fully mixed in pipeline, carry out secondary and staticly settle; The supernatant liquor that obtains after the precipitation at last enters clean water basin, and through can again being back to use printing and dyeing washing production line after the assay was approved, a small amount of mud that obtains after the precipitation enters sludge sump;
5) mud that the 3rd step was obtained enters sludge sump, then the mud in the sludge sump is carried out processed, and the mud after the dehydration is discharged, and the clear water that dehydration obtains enters settling tank, re-starts processing.
Achievement data sees Table 1 before and after the processing of embodiment 1 ~ 3 handled waste water of basic printing and dyeing.
Achievement data before and after the processing of the different embodiment neutral and alkali of table 1 dyeing waste water
As shown in Table 1, treated water, COD clearance about 80%, chroma removal rate is more than 85%, and total iron content has 130mg/L to reduce to 0.45mg/L, meets the printing and dyeing technology water requirement fully, can again be back to use dyeing and printing process, save to a certain extent water resources.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a method of utilizing spent acid to process waste water of basic printing and dyeing is characterized in that, may further comprise the steps:
1) waste water of basic printing and dyeing is carried out the pH pH-value determination pH, and adjust the pH value between 11 ~ 13;
2) will adjust the waste water of pH value, according to 3 of waste water weight ~ 8 ‰, add the spent acid discoloring agent, the processing of decolouring;
3) will decolour waste water after processing according to the chemical feeding quantity of 0.3 ~ 1.5ppm, adds flocculation agent, staticly settles 10 ~ 30min, obtains supernatant liquor and mud;
4) supernatant liquor that the 3rd step was obtained, at first according to waste water weight 3 ~ 8 ‰, add industrial chlorine bleach liquor, further unnecessary iron ion and a small amount of staining agent in the oxidized waste water, then the chemical feeding quantity according to 0.3 ~ 1.5ppm adds flocculation agent, mixed flocculation, carrying out secondary staticly settles, the supernatant liquor that obtains after the precipitation at last is back to use printing and dyeing washing production line again through after the assay was approved, and a small amount of mud mud that obtains after the precipitation is discharged dehydration, obtains dewatered sludge and clear water, mud is discharged, clear water got back to for the 1st step, and waste water of basic printing and dyeing mixes again processing;
5) the mud discharge dehydration that the 3rd step was obtained obtains dewatered sludge and clear water, and mud is discharged, and clear water got back to for the 1st step, and waste water of basic printing and dyeing mixes again processing.
2. a kind of method of utilizing spent acid to process waste water of basic printing and dyeing as claimed in claim 1, it is characterized in that: described spent acid discoloring agent is spent pickle liquor, moiety comprises that content of hydrochloric acid is that the content of 1mol/L, total iron is 80.8g/L.
3. a kind of method of utilizing spent acid to process waste water of basic printing and dyeing as claimed in claim 2, it is characterized in that: the addition of described spent acid discoloring agent is 5 ‰.
4. a kind of method of utilizing spent acid to process waste water of basic printing and dyeing as claimed in claim 1, it is characterized in that: described flocculation agent is polyacrylamide.
5. a kind of method of utilizing spent acid to process waste water of basic printing and dyeing as claimed in claim 1, it is characterized in that: the addition of flocculation agent is 1ppm in described the 3rd step.
6. a kind of method of utilizing spent acid to process waste water of basic printing and dyeing as claimed in claim 1, it is characterized in that: the addition of flocculation agent is 1ppm in described the 4th step.
7. a kind of method of utilizing spent acid to process waste water of basic printing and dyeing as claimed in claim 1, it is characterized in that: described industrial chlorine bleach liquor's available chlorine content is 10%.
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Cited By (9)
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| CN103641256A (en) * | 2013-11-30 | 2014-03-19 | 常熟市华宇针织印染有限公司 | Treatment process of alkaline dyeing waste water |
| CN103979705A (en) * | 2014-04-18 | 2014-08-13 | 绍兴奇彩化工有限公司 | Method for recovering potassium nitrate from anthraquinone dye alkali wastewater |
| CN106430707A (en) * | 2016-09-28 | 2017-02-22 | 武汉万安环保工程技术有限公司 | Skid-mounted system used for treating oily sewage |
| CN106477764A (en) * | 2015-09-02 | 2017-03-08 | 徐学文 | A kind of technique processing severe sewage decoloring |
| CN108083483A (en) * | 2016-11-19 | 2018-05-29 | 湖南唯美环境工程股份有限公司 | A kind of papermaking or the decoloration treatment method of dyeing waste water |
| CN109734212A (en) * | 2019-02-20 | 2019-05-10 | 河北瑞鑫化工有限公司 | A kind of technique based on coagulant sedimentation processing alkalescent light green waste water |
| CN110550762A (en) * | 2018-06-01 | 2019-12-10 | 李界文 | Process for removing COD, ammonia nitrogen, aniline and phosphorus from printing and dyeing wastewater and preparation and use method of medicament |
| CN110747663A (en) * | 2019-10-28 | 2020-02-04 | 湖南特俪洁新材料科技有限公司 | Reactive dye printing paste and printing method thereof |
| CN112174362A (en) * | 2019-07-01 | 2021-01-05 | 李谨芳 | Process and agent for removing ammonia nitrogen from desulfurization and denitrification wastewater of thermal power plant and use method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103641256A (en) * | 2013-11-30 | 2014-03-19 | 常熟市华宇针织印染有限公司 | Treatment process of alkaline dyeing waste water |
| CN103979705A (en) * | 2014-04-18 | 2014-08-13 | 绍兴奇彩化工有限公司 | Method for recovering potassium nitrate from anthraquinone dye alkali wastewater |
| CN103979705B (en) * | 2014-04-18 | 2015-05-20 | 绍兴奇彩化工有限公司 | Method for recovering potassium nitrate from anthraquinone dye alkali wastewater |
| CN106477764A (en) * | 2015-09-02 | 2017-03-08 | 徐学文 | A kind of technique processing severe sewage decoloring |
| CN106430707A (en) * | 2016-09-28 | 2017-02-22 | 武汉万安环保工程技术有限公司 | Skid-mounted system used for treating oily sewage |
| CN108083483A (en) * | 2016-11-19 | 2018-05-29 | 湖南唯美环境工程股份有限公司 | A kind of papermaking or the decoloration treatment method of dyeing waste water |
| CN110550762A (en) * | 2018-06-01 | 2019-12-10 | 李界文 | Process for removing COD, ammonia nitrogen, aniline and phosphorus from printing and dyeing wastewater and preparation and use method of medicament |
| CN109734212A (en) * | 2019-02-20 | 2019-05-10 | 河北瑞鑫化工有限公司 | A kind of technique based on coagulant sedimentation processing alkalescent light green waste water |
| CN112174362A (en) * | 2019-07-01 | 2021-01-05 | 李谨芳 | Process and agent for removing ammonia nitrogen from desulfurization and denitrification wastewater of thermal power plant and use method |
| CN110747663A (en) * | 2019-10-28 | 2020-02-04 | 湖南特俪洁新材料科技有限公司 | Reactive dye printing paste and printing method thereof |
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Application publication date: 20130306 |