CN102863062A - Separating method of aqueous alkali and size in refining waste water of dyeing and finishing - Google Patents
Separating method of aqueous alkali and size in refining waste water of dyeing and finishing Download PDFInfo
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- CN102863062A CN102863062A CN2012103821699A CN201210382169A CN102863062A CN 102863062 A CN102863062 A CN 102863062A CN 2012103821699 A CN2012103821699 A CN 2012103821699A CN 201210382169 A CN201210382169 A CN 201210382169A CN 102863062 A CN102863062 A CN 102863062A
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Abstract
A separating method of aqueous alkali and size in refining waste water of dyeing and finishing relates to separating treatment process technology of textile dyeing and finishing refining waste water. Alkali is added in the refining waste water, alkali concentration in the refining waste water is increased, and micro-molecular size coagulates by itself to form macro molecules and then is filtered through a nanometer filter. No other chemical drug is used during filtering, only a part of size and refining auxiliaries are left in filtrate, and the filtrate can be recycled in refining continuously. No flocculant or other chemical substances are required to be used, the size in the waste water is separated by using the principles, and an effect of recycling the separated alkali solution and auxiliaries is achieved.
Description
Technical field
The present invention relates to textile technology field, the separating treatment Technology of the concise waste water of particularly printing and dyeing.
Background technology
In order to prevent at fabrication processes middle longitude fracture, generally warp need pass through sizing technique when spinning grey cloth production, can use different slurries according to the kind of fiber in sizing technique, normally used slurry has starch, PVA(to claim again polyvinyl alcohol) and polymethyl acrylate etc.
But just can carry out dyeing after must removing the slurry on the grey cloth fully in dyeing and printing process, this process quilt of removing slurry is called pre-treatment or concise.Not only in alkaline solution, carry out destarch in existing pre-treatment or the refining process and process, also add other the auxiliary destarch and concise of auxiliary agent.At this moment contain a large amount of slurries and auxiliary addition agent in the waste water that produces, so the basicity of waste water and COD are very high.
Now general concise method of wastewater treatment is to add flocculation agent in concise waste water, again the method for throw out and liquid separation.
The defective that the flocculation agent itself of commonly using at present exists:
1, flocculating effect is subjected to the impact of temperature: mostly the hydrolysis of coagulating agent is thermopositive reaction, and when water temperature was low, the coagulating agent hydrolysis not exclusively; When water temperature was hanged down, pedesis weakened, and viscosity increases, and collision frequency is reduced, and simultaneously, shearing force is difficult to greatly form larger flocs unit.
2, flocculating effect is subjected to the impact of water PH value: because water PH value affects form and the performance of coagulating agent aluminium salt, iron salt hydrolysis product, so influential to coagulation effect.When aluminium salt, molysite stepwise hydrolysis, all discharge, the value of former water is reduced, when departing from the suitable pH value scope of aluminium salt, the product of high electric charge low polymerization degree is on the high side.Take off surely although be conducive to the compression double electric layer micelle, flocculation efficiency is relatively poor.Therefore, during the original water basicity capacity, add the decline that can not cause pH value behind the aluminum salt, when original water basicity contains quantity not sufficient, should hold concurrently simultaneously and throw quantitative alkaline agent.
3, flocculating effect is subjected to the impact of flocculation agent character and structure: for polymeric flocculant, comprise organically and inorganic, its structure and character are very large on throwing out impact.The polymerization degree of inorganic polymer flocculant is larger, then its charge neutrality ability and adsorption bridging function are stronger, and for organic floculant, except the polymerization degree is that the molecular weight requirement is greater than ten thousand dalton, its throwing out of the flocculation agent of linear structure is large, becomes circlewise the flocculating effect of organic polymer coargulator of branched structure then relatively poor.
4, flocculating effect is subjected to the impact of flocculant dosage: in feedwater and wastewater treatment, the consumption of flocculation agent is the important factor for controlling that affects flocculation process, the lot of experiments figure line shows, various flocculation agents have the optimum dosage under corresponding conditions, be lower than or surpass this consumption all can the time flocculating effect descend.When using quantity not sufficient, the thorough inexcessive surely phenomenon that then can cause again of throwing out.The dosage of flocculation agent is subjected to the impact of various factors in the water body.Different water bodys has different values.
5, flocculating effect is subjected to the impact of flow velocity condition: flocculation agent adds after the water body, by itself diffusion and the current mixing effect make it with water body in particle fully contact, and then the cohesion flocculation reaction occurs.Thereby, select suitable flow velocity condition also extremely important.Generally when the beaker test is carried out in the laboratory, in order to increase particle collision speed, increase the touch opportunity of flocculation agent and particle, often will carry out mechanical stirring, and speed and the time of stirring must be selected proper.For example: polymeric flocculant act as the master with build bridge absorption and polar group surface adsorption, dosing place needs violent stirring, make it rapidly, be dispersed in the water, but the time can not be long, otherwise bridge formation adsorptive power, the flocculating effect that can reduce macromolecular chain descend.Subordinate phase will stir slowly, promotes absorption and bridging action, impels the flco growth.
6, except above-mentioned influence factor, separation method and technological design all have a great impact throwing out and separating effect.Different separation methods is also different to the requirement of the size of formed floc sedimentation and character.Can the correctness of technological design then be the key that guarantee that formed flocs unit is separated fully.So separation method and technological design all are the important steps of flocculation treatment.
The defective of the method processing refining sewage existence that in addition, use flocculation, separates: because the medicament input amount is large, the dosing expense is high, the removal dirt is not thorough, sludge quantity is large and water content is high, the dehydration difficulty, be difficult to further processing, can produce secondary pollution.
Summary of the invention
The separation method of alkaline solution and slurry in the concise waste water of printing and dyeing that the present invention seeks to propose that a kind of convenience is controlled, be need not to add flocculation agent, the alkaline solution after separating and auxiliary agent can be recycled.
The present invention adds alkali in concise waste water, improve the alkali concn in the concise waste water, makes the slurry of scintilla be condensed into voluntarily polymer, then filters by nanofilter.
Because refining process is that slurry is dispersed in alkaline solution and from the process that fabric comes off, the slurry that comes off is in the scintilla state of dispersion.The present invention utilizes slurry in the different principle of different basicity medium viscosities, and higher its viscosity of basicity is stronger, and flocculating result is higher mutually.The present invention does not use other chemical agent in filtration, so slurry and the scouring assistant of a filtered liquid lingering section can continue to recycle in concise fully.The present invention does not use any flocculation agent or other chemical substance, only utilizes above principle to separate slurry in the waste water, the effect that the alkaline solution after the separation and auxiliary agent recycle.
No matter be that a kind of slurry (starch, polyvinyl alcohol or polymethyl acrylate), alkali concn begins aggregation after being increased to suitable concentration immediately.But need the reaction times more than 6 hours under the normal temperature.Within not being higher than 90 ℃ temperature range, the higher speed of response of temperature is faster.
Embodiment
One, take the printing and dyeing concise method of wastewater treatment of starch as main slurry grey cloth:
In concise waste water, add alkali (being generally NaOH), make the mass percent concentration of the alkali in the concise waste water reach 10-20%, the hot mixed solution that accompanies each other, under 50～70 ℃ condition, the starch that was in scintilla through 6 hours in the concise waste water is condensed into polymer voluntarily.
Above reaction material is filtered by nanofilter.
Filtered solution is slurry and the scouring assistant of lingering section.
The starch polymer that concentrated solution namely condenses.
Two, claim again polyvinyl alcohol take PVA() be the concise method of wastewater treatment of printing and dyeing of main slurry grey cloth:
In concise waste water, add alkali, make the mass percent concentration of the alkali in the concise waste water reach 0.5-25%, the hot mixed solution that accompanies each other, under 60～80 ℃ condition, the polyvinyl alcohol that was in scintilla through 5 hours in the concise waste water is condensed into polymer voluntarily.
Above reaction material is filtered by nanofilter.
Filtered solution is slurry and the scouring assistant of lingering section.
The high-molecular polyvinyl alcohol that concentrated solution namely condenses.
Three, take the printing and dyeing concise method of wastewater treatment of polymethyl acrylate as main slurry grey cloth:
In concise waste water, add alkali, make the mass percent concentration of the alkali in the concise waste water reach 2.0～25%, the hot mixed solution that accompanies each other, under 70～90 ℃ condition, the polymethyl acrylate that was in scintilla through 4 hours in the concise waste water is condensed into polymer voluntarily.
Above reaction material is filtered by nanofilter.
Filtered solution is slurry and the scouring assistant of lingering section.
The polymethyl acrylate polymer that concentrated solution namely condenses.
Above each filtered solution is used for destarch to be recycled.
Claims (2)
1. the print and dye separation method of alkaline solution and slurry in the concise waste water is characterized in that adding alkali in concise waste water, improves the alkali concn in the concise waste water, makes the slurry of scintilla be condensed into voluntarily polymer, then filters by nanofilter.
2. the separation method of alkaline solution and slurry in the concise waste water of described printing and dyeing according to claim 1 is characterized in that the temperature condition of described cohesion is≤90 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012103821699A CN102863062A (en) | 2012-10-11 | 2012-10-11 | Separating method of aqueous alkali and size in refining waste water of dyeing and finishing |
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| CN2012103821699A CN102863062A (en) | 2012-10-11 | 2012-10-11 | Separating method of aqueous alkali and size in refining waste water of dyeing and finishing |
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| CN102863062A true CN102863062A (en) | 2013-01-09 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86107806A (en) * | 1986-11-20 | 1988-07-20 | 山东海洋学院 | Treatment method of printing and dying wastewater |
| JPH0671589B2 (en) * | 1991-05-07 | 1994-09-14 | 中小企業事業団 | Desizing wastewater treatment method |
| CN1186778A (en) * | 1996-12-31 | 1998-07-08 | 中国科学院海洋研究所 | Treating method of printing and dyeing waste water |
| KR0173968B1 (en) * | 1990-08-31 | 1999-02-01 | 서희동 | Method for the concentration and separation of solid-liquid within waste water treatment process |
| CN101337725A (en) * | 2008-06-12 | 2009-01-07 | 林啟贤 | PVA precipitant and processing method for desizing waste water |
| CN101514057A (en) * | 2008-11-26 | 2009-08-26 | 浙江美欣达印染集团股份有限公司 | Method for recycling textile, printing and dyeing wastewater |
-
2012
- 2012-10-11 CN CN2012103821699A patent/CN102863062A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86107806A (en) * | 1986-11-20 | 1988-07-20 | 山东海洋学院 | Treatment method of printing and dying wastewater |
| KR0173968B1 (en) * | 1990-08-31 | 1999-02-01 | 서희동 | Method for the concentration and separation of solid-liquid within waste water treatment process |
| JPH0671589B2 (en) * | 1991-05-07 | 1994-09-14 | 中小企業事業団 | Desizing wastewater treatment method |
| CN1186778A (en) * | 1996-12-31 | 1998-07-08 | 中国科学院海洋研究所 | Treating method of printing and dyeing waste water |
| CN101337725A (en) * | 2008-06-12 | 2009-01-07 | 林啟贤 | PVA precipitant and processing method for desizing waste water |
| CN101514057A (en) * | 2008-11-26 | 2009-08-26 | 浙江美欣达印染集团股份有限公司 | Method for recycling textile, printing and dyeing wastewater |
Non-Patent Citations (4)
| Title |
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| 《中国煤炭》 20090228 崇立芹 等 采用印染退浆废水制备水煤浆的试验研究 第74页左栏第1段，第75页右栏倒数第2-3段及附图2 1-2 第35卷, 第2期 * |
| 崇立芹 等: "采用印染退浆废水制备水煤浆的试验研究", 《中国煤炭》, vol. 35, no. 2, 28 February 2009 (2009-02-28) * |
| 张家明: "水煤浆添加剂工业试验", 《中氮肥》, no. 1, 31 January 2002 (2002-01-31) * |
| 李然 等: "膜法处理退浆废水", 《水处理技术》, vol. 29, no. 1, 28 February 2003 (2003-02-28) * |
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Application publication date: 20130109 |