CN105502855A - Method for performing combined treatment on TAIC industrial wastewater through alkaline demulsification and hydrolysis-contact oxidation system - Google Patents
Method for performing combined treatment on TAIC industrial wastewater through alkaline demulsification and hydrolysis-contact oxidation system Download PDFInfo
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- CN105502855A CN105502855A CN201610074121.XA CN201610074121A CN105502855A CN 105502855 A CN105502855 A CN 105502855A CN 201610074121 A CN201610074121 A CN 201610074121A CN 105502855 A CN105502855 A CN 105502855A
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- taic
- factory effluent
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- oxidation system
- catalytic oxidation
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a method for performing combined treatment on TAIC industrial wastewater through alkaline demulsification and a hydrolysis-contact oxidation system. The method is characterized by comprising the following steps: performing alkalifying demulsification on TAIC industrial wastewater produced in the TAIC production process, heating the TAIC industrial wastewater so as to separate out TAIC, and producing floccules; and finally, sequentially settling the wastewater in a settling basin, mixing with domestic sewage and carrying out a biochemical reaction in the hydrolysis-contact oxidation system, and connecting the effluent to a sewage treatment plant after treatment, thereby finishing the treatment. According to the method disclosed by the invention, a simple and high-efficiency alkaline demulsification method serves as a pretreatment process of TAIC industrial wastewater which is difficult to biochemically degrade, 70 percent or above of TAIC contaminants in the TAIC industrial wastewater can be removed by virtue of the pretreatment process, and B/C can be improved to be 0.3 or above. Moreover, any adsorbent and flocculating agent do not need to be added, the treatment cost is low, and secondary pollution is avoided.
Description
Technical field
The present invention relates to a kind for the treatment of process of TAIC factory effluent, belong to field of industrial waste water treatment.
Background technology
TAIC, have another name called cyanacrylate, be a kind of multi-functional olefinic monomer containing fragrant heterocycle, be widely used in the properties-correcting agent of multiple plastic, rubber, linking agent and cocuring agent etc., also may be used for the synthesis of excellent flame retardant, is a kind of purposes fine chemical product extremely widely.In the industrial production, TAIC normally adopts cyanate method technique to be prepared, main process adopts the method for extracting and separating to obtain TAIC product after propenyl chloride and cyanate polyreaction, wherein DMF becomes the by product of technique together with NaCl as solvent, forms TAIC factory effluent with a part of TAIC product introduction wash-down water.
TAIC is at room temperature a kind of colourless or micro-yellow oily liquid or six square pieces, be insoluble in water, be slightly soluble in alkane, entirely be dissolved in aromatic hydrocarbons, ethanol, acetone, halohydrocarbon, because its molecular structural formula has higher symmetry, chemical property is highly stable, and very difficult advanced oxidization method or absorption method are removed, and independent biochemical system treatment effect can be poorer.Although there have been some scholars to adopt the method for iron-carbon micro-electrolysis or charcoal absorption to remove TAIC, but removal efficiency is lower on the one hand, removal efficiency so not high in reality, need to add a large amount of iron filings and gac on the other hand, cause higher processing cost, produce secondary pollution (mud is all that danger is useless, needs process equally), be not therefore suitable for engineering field.
It is agglomerating that breakdown of emulsion refers to that the disperse phase of milk sap little liquid pearl assembles, and forms large drop, finally make the process that water-oil phase layering is separated out.Breaking method can be divided into Physical and physico-chemical processes.Physical has electric sedimentation, regulates pH, heating, ultrasonic, centrifugation etc.; Physico-chemical processes mainly changes the interfacial property of emulsion and breakdown of emulsion, as added emulsion splitter etc.The material that waste water can make some be insoluble in water after breakdown of emulsion is separated from water, reaches the effect of directly removing pollutent, can improve the biodegradability of waste water simultaneously, often be combined with biochemical system and can obtain good treatment effect.
TAIC factory effluent is different from general emulsification state waste water, due to this super solvent of DMF and the existence of a large amount of NaCl, causes the increase of the solubleness of TAIC in water, defines this stable emulsification form of water-DMF-TAIC.
Therefore, a kind of high efficiency method being suitable for processing TAIC factory effluent is urgently excavated.
Three, summary of the invention
The present invention is intended to avoid the weak point existing for above-mentioned prior art, proposes a kind for the treatment of process of simple TAIC factory effluent efficiently, to TAIC factory effluent can be made effectively to be administered, alleviates the problem of environmental pollution that TAIC factory effluent brings.
Technical solution problem of the present invention, adopts following technical scheme:
The method of the present invention's alkalescence breakdown of emulsion and hydrolysis-catalytic oxidation system combined process TAIC factory effluent, its feature is: first add alkali breakdown of emulsion to producing the TAIC factory effluent produced in TAIC process, then it is heated, TAIC is separated out, produce floss; Last successively by its settling tank precipitation, mix with sanitary sewage after carry out biochemical reaction in hydrolysis-catalytic oxidation system, process rear water outlet and take over to sewage work, namely complete process.Specifically comprise following steps:
(1) after producing the unified collection of the TAIC factory effluent produced in TAIC process, introducing equalizing tank, adding alkali adjust ph to being not less than 12;
(2) subsequently TAIC factory effluent is introduced heating unit, make TAIC factory effluent be heated to 60 ~ 70 DEG C, TAIC is separated out, produce floss;
(3) after heating, TAIC factory effluent introduces settling tank, makes the floss of generation precipitate into mud, mud-water separation;
(4) supernatant liquor in settling tank is introduced equalizing tank, mix with the sanitary sewage in plant area, and adjust ph is to 6-7, obtains composite waste;
(5) composite waste is introduced hydrolysis-catalytic oxidation system and carry out biochemical reaction, after process, water outlet adapter is to sewage work
The method of the present invention's alkalescence breakdown of emulsion and hydrolysis-catalytic oxidation system combined process TAIC factory effluent, its feature is also: described TAIC factory effluent is the waste water adopting cyanate method explained hereafter TAIC to produce.Described TAIC factory effluent mainly comprises DMF, TAIC, NaCl tri-kinds of pollutents, and DMF concentration is about 150-700mg/L, TAIC concentration be about 600-1800mg/L, COD is about 15000-30000mg/L, and salinity is 2.9-3.2%, pH is about 3-5.Although TAIC is water-fast material, DMF is a kind of menstruum universale, adds that waste water saltiness is high, pH value is low, facilitates the dissolving of TAIC in water, defines the TAIC factory effluent of emulsification state.
Alkali added in step (1) is sodium hydroxide, can not adopt calcium hydroxide, otherwise can cause post precipitation time lengthening, mud-water separation difficulty.
In step (2), waste water Heating temperature should at 60 DEG C ~ about 70 DEG C, and too low meeting causes breakdown of emulsion time lengthening, and the too high volatile gases that has produces, polluted air.
In step (3), settling tank adopts rectangular sedimentation tank, can reduce the destruction that water impact produces precipitation flco, and the adaptive faculty that rectangular sedimentation tank changes wastewater temperature is stronger.
Supernatant liquor in step (4) after breakdown of emulsion precipitation first mixes with sanitary sewage, then adjust ph, can reduce the dosage of acid, can increase the Carbon and nitrogen sources of hydrolysis system water inlet simultaneously, saves processing cost.
Due to the superpower stability of TAIC, TAIC factory effluent is made to be a kind of being difficult to by the waste water of biochemical degradation, also there is a lot of problem in TAIC factory effluent advanced oxidization method (iron-carbon micro-electrolysis, plasma body, ozone oxidation etc.) degraded simultaneously: degradation time is very long, degradation efficiency is not high, needs more power consumptions and cost; The toxicity of the degraded product of TAIC is stronger, has very adverse influence to follow-up biochemical reaction; TAIC degraded product is very complicated, and the effluent index that subsequent biochemical can be caused to react is unstable.In addition, sorbent material (gac, the resin) adsorption efficiency to TAIC also can only reach 60%, moreover needs to consume a large amount of sorbent material.
The present invention solves the problems referred to above by adopting the combined treatment process of alkaline breakdown of emulsion and hydrolysis-catalytic oxidation system.TAIC molecule why can be stable be dissolved in mainly due to the existence of this super solvent of DMF in factory effluent, and DMF alkalescence and heating condition under, can be easy to be decomposed.Therefore using the pre-treating technology of alkaline breakdown of emulsion as TAIC factory effluent, the DMF in TAIC factory effluent can be decomposed, TAIC is directly separated out from waste water, and through the lab scale in laboratory, this technique achieves good effect.Again turn down pH value simultaneously, the condition entering hydrolysis-catalytic oxidation system can be met, the adapter standard of sewage work can be reached through biochemical reaction discharge.
Beneficial effect of the present invention is embodied in:
(1) method of process TAIC factory effluent disclosed in this invention, makes TAIC factory effluent directly also heat the TAIC that can remove a large amount of difficult degradations through simple adjust ph, for follow-up biochemical treatment alleviates a large amount of burden;
(2) the present invention adopts breakdown of emulsion to separate out TAIC instead of degraded TAIC, stronger to the controllability of technique, avoids degraded product toxicity to have an impact to subsequent biochemical process;
(3) in method of the present invention without the need to adding any sorbent material and flocculation agent, processing cost is very low, does not produce secondary pollution, than the employing pre-treating technology such as iron-carbon micro-electrolysis and charcoal absorption environmental protection more;
(4) in the method for the invention, its purity size can be considered for the TAIC separated out, and recycle, produce value added.
(5) in the method for the invention, a part of NaCl can be separated out equally through breakdown of emulsion, reduce the salt content in solution, reduce the impact to subsequent biochemical system.
(6) combination process of the present invention is simply efficient, can steady and continuous process TAIC factory effluent and the adapter standard of sewage work can be reached.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the inventive method.
Embodiment
Embodiment 1
The present embodiment TAIC factory effluent used be as certain TAIC manufacturer of east adopt cyanate method explained hereafter TAIC the waste water that produces, it mainly comprises DMF, TAIC, NaCl tri-kinds of pollutents, initial TAIC concentration is 773mg/L, DMF concentration is 225mg/L, COD is 20180mg/L, salinity is 3%, pH is 4.5.
The present embodiment processes TAIC factory effluent as follows:
(1) introduce equalizing tank by after unified for TAIC factory effluent collection, add alkali and regulate pH to 12;
(2) subsequently TAIC factory effluent is introduced heating unit, make TAIC factory effluent be heated to 60 DEG C, produce floss;
(3) after heating, TAIC factory effluent introduces settling tank, and the floss of generation is precipitated into mud;
(4) supernatant liquor in settling tank is introduced equalizing tank, mix with the sanitary sewage in plant area, and adjust ph is to about 6.5, obtains composite waste;
(5) composite waste is introduced hydrolysis-catalytic oxidation system and carry out biochemical reaction, after process, water outlet adapter is to sewage work.
After processing TAIC factory effluent by the method for the present embodiment, the TAIC concentration of its settling tank water outlet is 231mg/L, DMF concentration be 26mg/L, COD is 6230mg/L, and salinity is 2.5%.TAIC clearance reaches more than 70%, and floc particle is larger, and settling property is fine, and biodegradability significantly improves simultaneously, and B/C can bring up to 0.33.
Embodiment 2
The present embodiment processes identical TAIC factory effluent by the mode that embodiment 1 is identical, and difference is only that the Heating temperature of TAIC factory effluent in step (2) is 70 DEG C.
After processing TAIC factory effluent by the method for the present embodiment, the TAIC concentration of its settling tank water outlet is 192mg/L, DMF concentration be 19mg/L, COD is 5860mg/L, and salinity is 2.4%.TAIC clearance reaches more than 75%, and floc particle is larger, and settling property is fine, and biodegradability significantly improves simultaneously.B/C can bring up to 0.34.
Claims (5)
1. the method for an alkaline breakdown of emulsion and hydrolysis-catalytic oxidation system combined process TAIC factory effluent, it is characterized in that: first add alkali breakdown of emulsion to producing the TAIC factory effluent produced in TAIC process, then it is heated, TAIC is separated out, produce floss; Last successively by its settling tank precipitation, mix with sanitary sewage after carry out biochemical reaction in hydrolysis-catalytic oxidation system, process rear water outlet and take over to sewage work, namely complete process.
2. the method for alkaline breakdown of emulsion according to claim 1 and hydrolysis-catalytic oxidation system combined process TAIC factory effluent, is characterized in that comprising following steps:
(1) after producing the unified collection of the TAIC factory effluent produced in TAIC process, introducing equalizing tank, adding alkali adjust ph to being not less than 12;
(2) subsequently TAIC factory effluent is introduced heating unit, TAIC factory effluent is heated to 60 ~ 70 DEG C, TAIC is separated out, produce floss;
(3) after heating, TAIC factory effluent introduces settling tank, makes the floss of generation precipitate into mud;
(4) supernatant liquor in settling tank is introduced equalizing tank, mix with the sanitary sewage in plant area, and adjust ph is to 6-7, obtains composite waste;
(5) composite waste is introduced hydrolysis-catalytic oxidation system and carry out biochemical reaction, after process, water outlet adapter is to sewage work.
3. the method for alkaline breakdown of emulsion according to claim 1 and 2 and hydrolysis-catalytic oxidation system combined process TAIC factory effluent, is characterized in that: described TAIC factory effluent is the waste water adopting cyanate method explained hereafter TAIC to produce.
4. the method for alkaline breakdown of emulsion according to claim 2 and hydrolysis-catalytic oxidation system combined process TAIC factory effluent, is characterized in that: step (1) alkali used is sodium hydroxide.
5. the method for alkaline breakdown of emulsion according to claim 2 and hydrolysis-catalytic oxidation system combined process TAIC factory effluent, is characterized in that: step (3) settling tank used is rectangular sedimentation tank.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105753800A (en) * | 2016-02-06 | 2016-07-13 | 江苏华星新材料科技股份有限公司 | Alkaline demulsification processing based recovery process of triallyl isocyanurate in wastewater for preparing triallyl isocyanurate |
| CN114805924A (en) * | 2022-05-11 | 2022-07-29 | 南京大学环境规划设计研究院集团股份公司 | Method for recovering cross-linking agent from DMF (dimethyl formamide) wastewater by using waste alkali liquor |
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| CN105753800A (en) * | 2016-02-06 | 2016-07-13 | 江苏华星新材料科技股份有限公司 | Alkaline demulsification processing based recovery process of triallyl isocyanurate in wastewater for preparing triallyl isocyanurate |
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| CN114805924A (en) * | 2022-05-11 | 2022-07-29 | 南京大学环境规划设计研究院集团股份公司 | Method for recovering cross-linking agent from DMF (dimethyl formamide) wastewater by using waste alkali liquor |
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Denomination of invention: Method for performing combined treatment on TAIC industrial wastewater through alkaline demulsification and hydrolysis-contact oxidation system Effective date of registration: 20200522 Granted publication date: 20180417 Pledgee: Merchants Bank Hefei branch Xiyou Rd. Pledgor: ANHUI HUIZETONG ENVIRONMENT TECHNOLOGY Co.,Ltd. Registration number: Y2020980002401 |