CN105084576A - Method for treating high-concentration water-based ink waste liquid and dehydrating sludge in high-concentration water-based ink waste liquid - Google Patents
Method for treating high-concentration water-based ink waste liquid and dehydrating sludge in high-concentration water-based ink waste liquid Download PDFInfo
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Abstract
The invention discloses a method for treating high-concentration water-based ink waste liquid and dehydrating sludge in the high-concentration water-based ink waste liquid. The method is characterized by comprising the following steps: collecting the water-based ink waste liquid, pumping the collected water-based ink waste liquid into a reactor, then adding inorganic acid into the waste liquid, carrying out stirring and adjusting the pH value of the waste liquid until the waste liquid is acidic; allowing the sludge to enter and be located on a dehydration filter belt, heating the sludge with microwaves, carrying out squeezing and dehydration, and spraying water on the dehydrated sludge to rapidly cool the surface of the dehydrated sludge; and taking the sludge off the filter belt and discharging dehydration water into a subsequent waste water treating system. With the method provided by the invention, integrated removal of pollutants in the ink waste liquid and dehydration of the sludge is realized; the removal rate of the pollutants reaches more than 90%; a decolorization ratio is up to more than 99%; and the treated sludge has a water content of lower than 40%.
Description
Technical field
The invention belongs to the sewage in environmental engineering, technical field of sludge treatment, particularly relate to a kind of method of high concentration aqueous's ink liquid waste disposal and sludge dewatering thereof.
Background technology
Water color ink, because the characteristic of its health, environmental protection, safety, is widely used in every field.As wrapping material, water-proof material adopt water color ink usually when stamp, but needing cleaning printing machine and ink reservoir when changing stamp pattern, creating a certain amount of high concentration aqueous's ink waste liquid.This water color ink waste liquid contains the organic pollutants such as a large amount of water-soluble polymer resin, wetting ability pigment and organic solvent, pollute very serious (colourity up to more than 30,000 times, COD
crvalue is up to 200,000-60 ten thousand mg/L), be difficult to process.
For the process of this kind of water color ink waste liquid, usual employing Coagulation Method processes, i.e. dosing coagulant ferrous sulfate, polymerize aluminum chloride etc. in hydrotropisms's ink waste liquid, and solid-liquid separation removes pollution substances a large amount of in waste liquid, deviate from water and carry out subsequent disposal again, rear discharge up to standard.For the solid-liquid separating method after coagulating and equipment, usually adopt sheet frame to roll filter, belt type dewaterer or centrifuge etc. and carry out mechanical dehydration, but the mud Bound moisture content produced after coagulation is high, dehydration is difficulty very.
Chinese patent once disclosed the mud dewatering method (publication number CN102659297A) of a kind of microwave and the coupling of PAM flocculation agent, its method is by the mud through sludge thickener, frequency be 2450MHz, power be the condition of 700w under microwave radiation 50s, then PAM flocculation agent is added, the ratio of adding is that 100mL mud adds 4mLPAM flocculation agent, the concentration of PAM flocculation agent is 1g/L, carries out centrifugal or filter-press dehydration, namely completes sludge dewatering.This invention utilizes microwave radiation to the effect of mud flco, by higher frequency electromagnetic field, mud granule accelerated motion is collided mutually, mud flco is destroyed discharges wherein part Bound moisture and interstitial water, combine the conditioning of PAM flocculation agent again, make mud granule can take off rapidly steady flocculation, thus make the dehydrating effect of mud better, reduce flocculant dosage simultaneously.A kind of excess sludge dewatering based on microwave irradiation technology (publication number CN102643005A) disclosed in Chinese patent, realized by following steps: 1. the pipeline between settling tank and concentration basin installs one section of fiber reinforced plastic pipe additional, install microwave deceleration loading device additional in fiber reinforced plastic pipe outside; 2. the excess sludge of will discharge from settling tank, enters concentration basin through fiber reinforced plastic pipe, and the time that excess sludge is subject to microwave radiation in fiber reinforced plastic pipe is 90-130s; 3. the excess sludge after step 2 processes enters concentration basin again and carries out gravity concentration process, finally again through centrifuge dehydration process, completes excess sludge dehydration operation.
Foregoing invention is all utilize microwave to destroy mud flco release sludge water content, and to improve dehydrating effect, but mud is follow-up still needs centrifuge dehydration or filter-press dehydration, and moisture percentage in sewage sludge is still about 75%.
Summary of the invention
The object of the present invention is to provide a kind of high concentration aqueous's ink waste liquor contamination thing minimizing technology, realize the efficient removal of pollutent in ink waste liquid.
Another object of the present invention is to the effective dehydrating method of the mud providing a kind of this kind of water color ink liquid waste disposal to produce.
For achieving the above object, technological method of the present invention is:
A method for high concentration aqueous's ink liquid waste disposal and sludge dewatering thereof, comprises the following steps:
Pump into stirred reactor after step a. water color ink waste collection, add mineral acid and stirring reaction 3-10min in waste liquid, regulate the pH value of waste liquid to be acid, pollutant reaction is separated out, and Keep agitation makes mud become pasty state;
Step b. mud enters on dehydration strainer, is 70-90 DEG C by microwave heating to mud temperature;
Step c squeezing mud, makes sludge dewatering, deviates from sludge hot in water and reactor and exchange, preheating mud;
Steps d. to mud water-spraying control, make mud be quickly cooled to surface temperature lower than 65 DEG C;
Step e. takes off mud on strainer, deviates from water and enters subsequent wastewater treatment system.
In described step a, the pH value of waste liquid is that acidity refers to that pH is 1-2; Described mineral acid is the one in sulfuric acid, hydrochloric acid or nitric acid.
In described step b, microwave heating width is greater than sludge blanket width on strainer.
In described step c, squeezing mode is mechanical expression.
In described steps d, water-spraying control water is that mud after exchanging with sludge hot in reactor deviates from water.
Ultimate principle of the present invention is:
Water color ink is referred to as ink, and it forms through abrasive machining primarily of water soluble resin, pigment dyestuff, solvent and related auxiliaries, and wherein water soluble resin is as the binder of ink, accounts for about 30% of water color ink.Because water soluble acrylic resin is functional in water soluble resin, be widely used.Therefore for this kind of water color ink waste water, after adding mineral acid, water soluble acrylic resin's breakdown of emulsion acid out can be made, thus destroy the stability of water color ink, after water soluble acrylic resin's breakdown of emulsion, colo(u)rant dispersion performance declines, and condenses, together with resin formation throw out, create a large amount of mud.When mud is heated to more than 70 DEG C, acrylic resin macromole softens, the hydrophobic contaminant matter such as parcel pigment dyestuff, occur automatically to shrink by reactive forces such as Van der Waals force, hydrogen bond, intermolecular cohesions, make molecule combine closely, reduce in conjunction with moisture, rely on poly-convergent force extruding internal moisture in mud to become free water, be easy to remove, dewater through mechanical expression, form block mud, dewatering speed is exceedingly fast.
Beneficial effect of the present invention:
A. this kind of high concentration aqueous's ink waste liquid is through present method process, and percent of decolourization is up to more than 99%, COD
crclearance reaches more than 90%;
B. the lump shape in compact structure after sludge dewatering, moisture percentage in sewage sludge is lower than 40%, and sludge volume is little;
What c. achieve that high concentration aqueous's ink waste liquor contamination thing removes with sludge dewatering is integrated, and soon, dewatering efficiency is high, can continuous seepage process for its dewatering speed.
Accompanying drawing explanation
Fig. 1 is the processing technological flow schematic diagram of the inventive method.
Embodiment
Embodiment 1 is with reference to Fig. 1.
The invention provides a kind of method of high concentration aqueous's ink liquid waste disposal and sludge dewatering thereof, adopt and make pollutent in waste liquid be transformed into hydrophobicity by wetting ability and form throw out method mineral acid acidified for water color ink waste liquid.Heated by microwave, makes pollutent mutually assemble, softens and shrink and squeeze the block mud of solidification dehydration formation.Present invention achieves water color ink liquid waste disposal and sludge dewatering integrated, its dewatering speed is fast, and dewatering efficiency is high, and moisture percentage in sewage sludge can be reduced to less than 40%, and can continuous seepage process.Concrete reference accompanying drawing 1 is illustrated.
Pump into stirred reactor by after water color ink waste collection, then in waste liquid, add mineral acid and stirring reaction, regulate the pH value of waste liquid to be acid, pollutent is separated out, and Keep agitation makes mud become pasty state; Mud enters with press dewatering after microwave heating on dehydration strainer, makes surface cooling fast to dewatered sludge water spray; Mud takes off Chinese effluent, carries out subsequent disposal, takes off dewatered sludge on strainer, natural mummification.
The invention provides a kind of method of high concentration aqueous's ink liquid waste disposal and sludge dewatering thereof, mainly comprise the following steps:
Step a. is by brown water color ink waste liquid (COD
cr: 36.8 ten thousand mg/L; Colourity: 50,000 times) be collected in ink reservoir after add stirred reactor with sump pump, then in waste liquid, add mineral acid, stir 5min, regulate the pH value of waste liquid to be 1-2, pollutent is separated out, and Keep agitation makes mud become pasty state;
Step b. mud enters on dehydration strainer, adopts microwave heating, makes mud be warming up to 78 DEG C, mutually assemble after mud heated by microwave, softens and shrink;
Step c squeezing mud, makes sludge dewatering, deviates from water and stirred reactor mud carries out heat exchange, preheating mud;
Steps d. to mud water-spraying control, make mud be quickly cooled to surface temperature lower than 65 DEG C, water coolant be utilize with reactor in sludge hot exchange after deviate from water;
Step e. takes off dewatered sludge on strainer, natural mummification, and mud is deviate from water and entered aftertreatment systems.
Adopt the inventive method process, after this kind of brown water color ink waste liquid acid out with microwave heating again through press dewatering, waste liquid COD
crclearance reaches more than 92%, and chroma removal rate can reach more than 99%.Dewatered sludge water ratio is lower than 40%, and sludge structure is fine and close, natural mummification.The method achieve the integration of high concentration aqueous's ink liquid waste disposal and sludge dewatering.
Embodiment 2
Pump into stirred reactor by after water color ink waste collection, then in waste liquid, add mineral acid and stir, regulate the pH value of waste liquid to be acid, pollutent is separated out, and Keep agitation makes mud become pasty state; Mud enters with press dewatering after microwave heating on dehydration strainer, makes surface cooling fast to mud water spray; Mud takes off Chinese effluent, carries out subsequent disposal, takes off dewatered sludge on strainer, natural mummification.
The invention provides a kind of method of high concentration aqueous's ink liquid waste disposal and sludge dewatering thereof, mainly comprise the following steps:
Step a. is by black mixing water color ink waste liquid (COD
cr: 43.2 ten thousand mg/L; Colourity: 80,000 times) be collected in ink reservoir after add stirred reactor with sump pump, then in waste liquid, add mineral acid, stir 8min, regulate the pH value of waste liquid to be 1-2, pollutent is separated out, and Keep agitation makes mud become pasty state;
Step b. mud enters on dehydration strainer, adopts microwave heating, makes mud be warming up to 80 DEG C, mutually assemble after mud heated by microwave, softens and shrink;
Step c squeezing mud, makes sludge dewatering, deviates from mud in water and stirred reactor and carry out heat exchange, preheating mud;
Steps d. to mud water-spraying control, make mud be quickly cooled to surface temperature lower than 65 DEG C, water coolant deviates from water after utilizing heat exchange;
Step e. takes off dewatered sludge on strainer, natural mummification, and mud is deviate from water and entered aftertreatment systems.
Adopt the inventive method process, with microwave heating after this kind of black mixing water color ink waste liquid acid out, then through press dewatering, waste liquid COD
crclearance reaches more than 92%, and chroma removal rate can reach more than 99%.The method achieve the integration of high concentration aqueous's ink liquid waste disposal and sludge dewatering, and sludge dewatering speed is fast, dewatering efficiency is high, and dewatered sludge water ratio is lower than 40%, and sludge structure is fine and close, natural mummification.
Claims (5)
1. a method for high concentration aqueous's ink liquid waste disposal and sludge dewatering thereof, comprises the following steps:
Pump into stirred reactor after step a. water color ink waste collection, add mineral acid and stirring reaction 3-10min in waste liquid, regulate the pH value of waste liquid to be acid, pollutant reaction is separated out, and Keep agitation makes mud become pasty state;
Step b. mud enters on dehydration strainer, and use microwave heating mud, mud temperature reaches 70-90 DEG C;
Step c squeezing mud, makes sludge dewatering, deviates from sludge hot in water and reactor and exchange, preheating mud;
Steps d. to mud water-spraying control, make Sludge Surface temperature be cooled to less than 65 DEG C;
Step e. takes off mud on strainer, deviates from water and enters subsequent wastewater treatment system.
2. the method for a kind of high concentration aqueous's ink liquid waste disposal according to claim 1 and sludge dewatering thereof, is characterized in that in described step a, pH value is that acidity refers to that pH is 1-2.
3. the method for a kind of high concentration aqueous's ink liquid waste disposal according to claim 1 and sludge dewatering thereof, is characterized in that in described step b, microwave heating peak width is greater than sludge blanket width.
4. the method for a kind of high concentration aqueous's ink liquid waste disposal according to claim 1 and sludge dewatering thereof, is characterized in that in described step c, squeezing mode is mechanical expression.
5. the method for a kind of high concentration aqueous's ink liquid waste disposal according to claim 1 and sludge dewatering thereof, is characterized in that water-spraying control water in described steps d is deviate from water after exchanging with sludge hot.
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