CN102515391A - Method for pre-treating wastewater from ultraviolet absorber production - Google Patents
Method for pre-treating wastewater from ultraviolet absorber production Download PDFInfo
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Abstract
The invention relates to a method for pre-treating wastewater from ultraviolet absorber production. The method is characterized in that the method mainly comprises the treating processes of settling separated oil, pre-neutralizing, extracting, secondarily neutralizing and regenerating an extracting agent. According to the method, a HLE phenol-containing wastewater extracting agent is used for separating polycyclic phenols which are difficult to be biodegraded in the wastewater; after being regenerated, the extracting agent is reused; after the wastewater of UV-0 production is treated according to the method, the biodegradability is greatly increased; the B/C ratio of the treated discharge water is increased from the original 0.01-0.1 to 0.3-0.5; the total COD (Chemical Oxygen Demand) removing rate is above 40%; the guarantee is supplied to the subsequent biochemical treatment; and the method has the advantages of convenience in operation, and the treating cost is lower than that of the pre-treating technologies, such as evaporation salting, advanced wastewater oxidation, and the like.
Description
Technical field
The invention belongs to technical field of waste water processing, relate to a kind of UVA agent production waste water pretreatment process.
Background technology
UV light absorber belongs to the remarkable efficient anti-aging auxiliary agent of performance, can absorb the UV-light of certain wavelength, can delay the material yellowing as UV light stabilizing agent, helps to reduce physicals losses such as color and luster and retardance.Therefore be widely used in plastic material productions such as PE, PVC, PP, PS, PC, synthetic glass, polypropylene fiber and ethene, acetic acid, vinyl acetate.
But UVA agent production waste water salinity is high, contain macromole heterocycle phenol is that thing, COD concentration are high, biodegradability is poor; Belong to the acid high-salt wastewater of typical high concentration organic; Its features of pollution is following: (1) organic pollutant concentration level is high; COD is more than 10,000 mg/L, and mainly containing phenol in the waste water is organism such as thing, benzene series thing, alcohols, acid amides.(2) the contained composition of waste water has bio-toxicity or inhibition, and biodegradability is poor, can't directly adopt biochemical method to handle, and lacks the appropriate pretreatment mode at present and improves wastewater biodegradability.(3) acid strong, salinity is high, contains a large amount of chlorine roots.(4) the waste discharge concentration change is big.
UVA agent series products factory effluent is high slat-containing wastewater mostly; Research is less both at home and abroad at present; For accomplishing that the waste water environment protection standard handles, the method for evaporating that enterprise's more options are traditional is analysed salt, and a large amount of steam of its technological process consumption, cost for wastewater treatment are high.And evaporation is separated out and mostly is abraum salt, abraum salt processing cost height, easy generation of secondary pollution.
Wu Jianwen once mentioned in " production principle of UV light absorber and wastewater treatment " paper; The AMT water technology of Korea S can be used in the UV light absorber wastewater treatment; The AMT technology mainly utilizes effects such as physical chemistry energy sound field and magnetic field to change water molecules and contaminant molecule structure; Generating the active radical of character, produce a large amount of strong oxidizers through UW, negative oxygen ion simultaneously---free hydroxyl is decomposed water pollutant.
UV light absorber wastewater treatment organic concentration is high, and intractability is big, does not see effective low-cost pre-treatment measure at present as yet, makes it after pre-treatment, can increase substantially wastewater biodegradability, is easy to biochemical treatment.
Summary of the invention
Technical problem to be solved by this invention is the deficiency to prior art, provide a kind of technological design rationally, can increase substantially wastewater biodegradability, make waste water adopt biochemical treatment cheaply to become possibility, reduce the UVA agent production waste water pretreatment process of cost for wastewater treatment significantly.
UV light absorber waste water of the present invention is meant that the high concentration organic phenol that UV light absorber products production workshop sections such as UV-0, UV-531 produce is the pre-treatment of pollutent waste water.Range of application of the present invention is not limited only to the production of UV-0, UV-531 product, is applicable to that also the phenol of other UV series of UV light absorber is the pollutent Wastewater Pretreatment.
Technical problem to be solved by this invention is to realize through following technical scheme.The present invention is a kind of UVA agent production waste water pretreatment process, and be characterized in: its step is following:
(1) earlier waste water is carried out the oil removal precipitation process, remove contained oil slick and suspended substance in the waste water;
The waste water that (2) will pass through the oil removal precipitation process carries out pre-neutralization, regulates waste water ph to 0.1～4 with lime slurry or liquid caustic soda;
(3) adopt extraction process to handle, the extraction agent that extraction is adopted is a HLE phenolic wastewater extraction agent; The weight ratio of extraction agent and waste water is 4:1～1:8 during extraction, and extraction temperature is 0～60 ℃; Extraction agent and waste water mix back layering in extraction tower through static line mixer or mechanical stirring; Extraction agent and waste water mixing time are 5～60min; Extraction agent mixes back separation time 20～120min with waste water; The upper strata is the load extraction agent, and lower floor is pretreated waste water;
(4) adopt anti-extraction process to handle; In the load extraction agent, add concentration during reextraction and be 5%～30% sodium hydroxide solution or potassium hydroxide solution, adjustment pH to 8～12; The weight ratio of load extraction agent and sodium hydroxide solution or potassium hydroxide solution is 20:1～1:2, and the reextraction temperature is 0～80 ℃; Load extraction agent and alkali lye mix back layering in stripping column through static line mixer or mechanical stirring, and the reextraction mixing time is 5～60min, mix back separation time 20～120min; Reextraction breaks away from pollutent in the load extraction agent, makes extractant regeneration, recycles;
(5) after the extraction treatment, in means of waste water reuse lime slurry or the liquid caustic soda secondary and adjustment pH to 6～9.
In above-described a kind of UVA agent production waste water pretreatment process technical scheme, further optimized technical scheme or technical characterictic are:
1, during step (2) pre-neutralization, preferably regulates waste water ph to 1～2 with liquid caustic soda.
2, in the step (3), the weight ratio of extraction agent and waste water is preferably 2:1～1:2 during extraction, and extraction temperature is preferably 20～40 ℃; Extraction agent and waste water mixing time are preferably 10～20 min, and extraction agent mixes the back separation time and is preferably 30～40 min with waste water.
3, in the step (4); The weight ratio of load extraction agent and sodium hydroxide solution or potassium hydroxide solution is preferably 5:1～10:1 during reextraction; The concentration of sodium hydroxide solution or potassium hydroxide solution is preferably 5%～10%, and the reextraction temperature is preferably 20～40 ℃; Load extraction agent and waste water mixing time are preferably 10～20 min, mix the back separation time and are preferably 30～40 min.
4, in the step (4), in the load extraction agent, add sodium hydroxide solution or potassium hydroxide solution during reextraction, preferably adjust pH to 10.
HLE phenolic wastewater extraction agent of the present invention is the commercially available prod, and product is called HLE phenolic wastewater extraction agent, and manufacturer is Lianyungang Design and Research Institute (Lanai Engineering Co.) (Lianyun Harbour design and research institute of former the Ministry of Chemical Industry), address: No. 51, West Road, Chaoyang, Lianyungang.
Supernatant load extraction agent drains into extractant regeneration system, lower floor waste water and discharges and carry out secondary and be neutralized to and deliver to waste water processing station after the neutrality and carry out biochemical treatment after the extraction tower layering.Extraction agent and pollutent carry out separation regeneration in back extraction tower load extraction agent, and the regenerated extraction agent is sent extraction workshop section continuously back to, and the pollutent back extraction concentrates surplus liquid can mix coal firing boiler burn processing or coal burning heat-conducting oil stove burn processing.
Compared with prior art, technology advantages of simple of the present invention, workable, easy to operate, processing cost is low.Wastewater biodegradability after art breading of the present invention increases substantially, and waste water B/C is than being increased to 0.3～0.5 by extraction preceding 0.01～0.1, and the total clearance of COD is more than 40%, and COD concentration descends significantly, for ultraviolet wastewater biochemical is handled up to standard providing the foundation.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Following with reference to accompanying drawing, further describe concrete technical scheme of the present invention, so that those skilled in the art understands the present invention further, and do not constitute restriction to its right.
Embodiment 1, with reference to Fig. 1, and a kind of UVA agent production waste water pretreatment process, its step is following:
(1) earlier waste water is carried out the oil removal precipitation process, remove contained oil slick and suspended substance in the waste water;
The waste water that (2) will pass through the oil removal precipitation process carries out pre-neutralization, regulates waste water ph to 0.1 with lime slurry or liquid caustic soda;
(3) adopt extraction process to handle, the extraction agent that extraction is adopted is a HLE phenolic wastewater extraction agent; The weight ratio of extraction agent and waste water is 4:1 during extraction, and extraction temperature is 0 ℃; Extraction agent and waste water mix back layering in extraction tower through static line mixer or mechanical stirring; Extraction agent and waste water mixing time are 5min; Extraction agent mixes back separation time 20min with waste water; The upper strata is the load extraction agent, and lower floor is pretreated waste water;
(4) adopt anti-extraction process to handle; In the load extraction agent, add concentration during reextraction and be 5% sodium hydroxide solution or potassium hydroxide solution, adjustment pH to 8; Load extraction agent and sodium hydroxide solution or potassium hydroxide solution weight ratio are 20:1, and the reextraction temperature is 0 ℃; Load extraction agent and alkali lye mix back layering in stripping column through static line mixer or mechanical stirring, and the reextraction mixing time is 5min, mix back separation time 20min; Reextraction breaks away from pollutent in the load extraction agent, makes extractant regeneration, recycles;
(5) after the extraction treatment, in means of waste water reuse lime slurry or the liquid caustic soda secondary with the adjustment pH to 6.
Embodiment 2, with reference to Fig. 1, and a kind of UVA agent production waste water pretreatment process, its step is following:
(1) earlier waste water is carried out the oil removal precipitation process, remove contained oil slick and suspended substance in the waste water;
The waste water that (2) will pass through the oil removal precipitation process carries out pre-neutralization, regulates waste water ph to 4 with lime slurry or liquid caustic soda;
(3) adopt extraction process to handle, the extraction agent that extraction is adopted is a HLE phenolic wastewater extraction agent; The weight ratio of extraction agent and waste water is 1:8 during extraction, and extraction temperature is 60 ℃; Extraction agent and waste water mix back layering in extraction tower through static line mixer or mechanical stirring; Extraction agent and waste water mixing time are 60min; Extraction agent mixes back separation time 120min with waste water; The upper strata is the load extraction agent, and lower floor is pretreated waste water;
(4) adopt anti-extraction process to handle; In the load extraction agent, add concentration during reextraction and be 30% sodium hydroxide solution or potassium hydroxide solution, adjustment pH to 12; The weight ratio of load extraction agent and sodium hydroxide solution or potassium hydroxide solution is 1:2, and the reextraction temperature is 80 ℃; Load extraction agent and alkali lye mix back layering in stripping column through static line mixer or mechanical stirring, and the reextraction mixing time is 60min, mix back separation time 120min; Reextraction breaks away from pollutent in the load extraction agent, makes extractant regeneration, recycles;
(5) after the extraction treatment, in means of waste water reuse lime slurry or the liquid caustic soda secondary with the adjustment pH to 9.
Embodiment 3, with reference to Fig. 1, and a kind of UVA agent production waste water pretreatment process, its step is following:
(1) earlier waste water is carried out the oil removal precipitation process, remove contained oil slick and suspended substance in the waste water;
The waste water that (2) will pass through the oil removal precipitation process carries out pre-neutralization, regulates waste water ph to 1 with lime slurry or liquid caustic soda;
(3) adopt extraction process to handle, the extraction agent that extraction is adopted is a HLE phenolic wastewater extraction agent; The weight ratio of extraction agent and waste water is 2:1 during extraction, and extraction temperature is 20 ℃; Extraction agent and waste water mix back layering in extraction tower through static line mixer or mechanical stirring; Extraction agent and waste water mixing time are 10min; Extraction agent mixes back separation time 30min with waste water; The upper strata is the load extraction agent, and lower floor is pretreated waste water;
(4) adopt anti-extraction process to handle; In the load extraction agent, add concentration during reextraction and be 10% sodium hydroxide solution or potassium hydroxide solution, adjustment pH to 10; The weight ratio of load extraction agent and sodium hydroxide solution or potassium hydroxide solution is 5:1, and the reextraction temperature is 20 ℃; Load extraction agent and alkali lye mix back layering in stripping column through static line mixer or mechanical stirring, and the reextraction mixing time is 10min, mix back separation time 30min; Reextraction breaks away from pollutent in the load extraction agent, makes extractant regeneration, recycles;
(5) after the extraction treatment, in means of waste water reuse lime slurry or the liquid caustic soda secondary with the adjustment pH to 7.
Embodiment 4, with reference to Fig. 1, and a kind of UVA agent production waste water pretreatment process, its step is following:
(1) earlier waste water is carried out the oil removal precipitation process, remove contained oil slick and suspended substance in the waste water;
The waste water that (2) will pass through the oil removal precipitation process carries out pre-neutralization, regulates waste water ph to 2 with lime slurry or liquid caustic soda;
(3) adopt extraction process to handle, the extraction agent that extraction is adopted is a HLE phenolic wastewater extraction agent; The weight ratio of extraction agent and waste water is 1:2 during extraction, and extraction temperature is 40 ℃; Extraction agent and waste water mix back layering in extraction tower through static line mixer or mechanical stirring; Extraction agent and waste water mixing time are 20min; Extraction agent mixes back separation time 40min with waste water; The upper strata is the load extraction agent, and lower floor is pretreated waste water;
(4) adopt anti-extraction process to handle; In the load extraction agent, add concentration during reextraction and be 15% sodium hydroxide solution or potassium hydroxide solution, adjustment pH to 11; The weight ratio of load extraction agent and sodium hydroxide solution or potassium hydroxide solution is 10:1, and the reextraction temperature is 40 ℃; Load extraction agent and alkali lye mix back layering in stripping column through static line mixer or mechanical stirring, and the reextraction mixing time is 20min, mix back separation time 40min; Reextraction breaks away from pollutent in the load extraction agent, makes extractant regeneration, recycles;
(5) after the extraction treatment, in means of waste water reuse lime slurry or the liquid caustic soda secondary with the adjustment pH to 8.
Embodiment 5, with reference to Fig. 1, and a kind of UVA agent production waste water pretreatment process, its step is following:
(1) earlier waste water is carried out the oil removal precipitation process, remove contained oil slick and suspended substance in the waste water;
The waste water that (2) will pass through the oil removal precipitation process carries out pre-neutralization, regulates waste water ph to 0.5 with lime slurry or liquid caustic soda;
(3) adopt extraction process to handle, the extraction agent that extraction is adopted is a HLE phenolic wastewater extraction agent; The weight ratio of extraction agent and waste water is 1:1 during extraction, and extraction temperature is 30 ℃; Extraction agent and waste water mix back layering in extraction tower through static line mixer or mechanical stirring; Extraction agent and waste water mixing time are 15min; Extraction agent mixes back separation time 35min with waste water; The upper strata is the load extraction agent, and lower floor is pretreated waste water;
(4) adopt anti-extraction process to handle; In the load extraction agent, add concentration during reextraction and be 8% sodium hydroxide solution or potassium hydroxide solution, adjustment pH to 10; The weight ratio of load extraction agent and sodium hydroxide solution or potassium hydroxide solution is 7:1, and the reextraction temperature is 30 ℃; Load extraction agent and alkali lye mix back layering in stripping column through static line mixer or mechanical stirring, and the reextraction mixing time is 15min, mix back separation time 35min; Reextraction breaks away from pollutent in the load extraction agent, makes extractant regeneration, recycles;
(5) after the extraction treatment, in means of waste water reuse lime slurry or the liquid caustic soda secondary with the adjustment pH to 7.5.
Embodiment 6, with reference to Fig. 1, and a kind of UVA agent production waste water pre-treatment experiment:
Certain ultraviolet absorbent UV-531 manufacturing enterprise, high concentrated organic wastewater 50 m3 discharge every day in UV-531 production workshop section of enterprise, and waste water at first gets into the oil removal groove, establishes the oil removal pipe on oil removal groove top and collects oil slick to gathering tank, and the bottom settlings thing regularly discharges.The gravity flow of oil removal groove waste water enters the pre-neutralization pond; Adopting volume pump that liquid caustic soda is pumped into the pre-neutralization pond carries out neutralization reaction to regulate waste water ph is 1～2; Pump into extraction tower with the waste water of pump after through line mixer with pre-neutralization; Temperature is 20～30 ℃ during extraction, and extraction agent is mixed back entering continuous extraction tower with waste water at line mixer by pumping into line mixer with waste water 1:1 flow.Behind extraction tower mixed solution process flow guide system, carry out layering up and down; Separation time 35min; Wherein the extraction phase of load pollutent is lighter, constantly discharges from the upper strata and drains into load extraction agent basin, and lower floor's waste water is to remove the waste water that macromole phenol is organic pollutant; Waste water B/C send the enterprises comprehensive waste water processing station to handle after secondary is neutralized to neutrality than higher.The extraction agent of load pollutent is delivered to the back extraction tower according to comparing (oil/water) 20:1 with 5% alkali lye after line mixer mixes; Temperature is 20～30 ℃ during reextraction; The pH value 10 of back extraction liquid concentrator, mixed solution get into the back extraction tower through continuous stratification behind the flow guide system, separation time 35min; Upper strata regenerated extraction agent flows out to the extraction agent basin continuously, and lower floor collection waste liquid flows out continuously to be delivered to enterprise's coal burning heat-conducting oil stove and mix coal combustion and handle after collecting.
After the above-mentioned process system engineering construction debugging, technology can be moved by continous-stable, water inlet COD
CrBe 10000-12000mg/L, COD in the effluent quality
CrReach more than 40% less than 7200mg/L, COD clearance, water outlet B/C ratio is 0.446, has biochemical preferably always.
Claims (5)
1. UVA agent production waste water pretreatment process, it is characterized in that: its step is following:
(1) earlier waste water is carried out the oil removal precipitation process, remove contained oil slick and suspended substance in the waste water;
The waste water that (2) will pass through the oil removal precipitation process carries out pre-neutralization, regulates waste water ph to 0.1～4 with lime slurry or liquid caustic soda;
(3) adopt extraction process to handle, the extraction agent that extraction is adopted is a HLE phenolic wastewater extraction agent; The weight ratio of extraction agent and waste water is 4:1～1:8 during extraction, and extraction temperature is 0～60 ℃; Extraction agent and waste water mix back layering in extraction tower through static line mixer or mechanical stirring; Extraction agent and waste water mixing time are 5～60min; Extraction agent mixes back separation time 20～120min with waste water; The upper strata is the load extraction agent, and lower floor is pretreated waste water;
(4) adopt anti-extraction process to handle; In the load extraction agent, add concentration during reextraction and be 5%～30% sodium hydroxide solution or potassium hydroxide solution, adjustment pH to 8～12; The weight ratio of load extraction agent and sodium hydroxide solution or Pottasium Hydroxide is 20:1～1:2, and the reextraction temperature is 0～80 ℃; Load extraction agent and alkali lye mix back layering in stripping column through static line mixer or mechanical stirring, and the reextraction mixing time is 5～60min, mix back separation time 20～120min; Reextraction breaks away from pollutent in the load extraction agent, makes extractant regeneration, recycles;
(5) after the extraction treatment, in means of waste water reuse lime slurry or the liquid caustic soda secondary and adjustment pH to 6～9.
2. a kind of UVA agent production waste water pretreatment process according to claim 1 is characterized in that: during step (2) pre-neutralization, regulate waste water ph to 1～2 with liquid caustic soda.
3. a kind of UVA agent production waste water pretreatment process according to claim 1 is characterized in that: in the step (3), the weight ratio of extraction agent and waste water is 2:1～1:2 during extraction, and extraction temperature is 20～40 ℃; Extraction agent and waste water mixing time are 10～20 min, and extraction agent mixes the back separation time with waste water be 30～40 min.
4. a kind of UVA agent production waste water pretreatment process according to claim 1; It is characterized in that: in the step (4); The weight ratio of load extraction agent and sodium hydroxide solution or potassium hydroxide solution is 5:1～10:1 during reextraction; The concentration of sodium hydroxide solution or potassium hydroxide solution is 5%～10%, and the reextraction temperature is 20～40 ℃; Load extraction agent and waste water mixing time are 10～20 min, and mixing the back separation time is 30～40 min.
5. a kind of UVA agent production waste water pretreatment process according to claim 1 is characterized in that: in the step (4), in the load extraction agent, add sodium hydroxide solution or potassium hydroxide solution during reextraction, adjustment pH to 10.
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Application publication date: 20120627 |