CN103387300A - Recovery method using membranes for terephthalic acid and sodium hydroxide from printing and dyeing alkali-reduced waste water - Google Patents
Recovery method using membranes for terephthalic acid and sodium hydroxide from printing and dyeing alkali-reduced waste water Download PDFInfo
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Abstract
The invention discloses a recovery method using membranes for terephthalic acid and sodium hydroxide from printing and dyeing alkali-reduced waste water. The method comprises (1) a step of collecting the printing and dyeing alkali-reduced waste water, and performing ultrafiltration by using a polytetrafluoroethylene hollow fiber membrane to obtain an ultrafiltration concentrated liquid and an ultrafiltration permeating liquid; (2) a step of feeding the ultrafiltration concentrated liquid into a sewage treatment plant; (3) a step of subjecting the ultrafiltration permeating liquid to nanofiltration by using a selective nanofiltration membrane component to obtain a nanofiltration concentrated liquid and a nanofiltration permeating liquid; (4) a step of adding concentrated sulfuric acid to the nanofiltration concentrated liquid to adjust the pH value to 2-3, precipitating the terephthalic acid, recovering and recycling the mother liquor after the mother liquor is treated; and (5) a step of recycling and reusing the nanofiltration permeating liquid which is a dilute sodium hydroxide solution to process production of a mercerizing machine or an alkaline machine. By the above manner, the method has simple operation and the method is capable of saving water resources, reducing production cost, and achieving a double harvest of economic benefit and environment benefit.
Description
Technical field
The present invention relates to field of waste water treatment, particularly relate to a kind of alkali decrement waste water film of printing and dyeing and reclaim the method for terephthalic acid and sodium hydroxide.
Background technology
At present trevira has become the important source material of apparel industry, and people utilize the alkali Decrement Technique, gives dacron fabric and has excellent characteristic as silk.Along with the growth of China's polyster fibre output, the terylene consumption accounts for 50% of China's piece market, and national polyster fibre annual production 2009 was 2204.4 ten thousand tons, and the 1-11 month in 2010 reached 2278.4 ten thousand tons.Take 2009 annual production as example, approximately there is 20% polyster fibre need to use caustic reduction processing, be 15% to calculate by reduction rate, will there be then 66.1 ten thousand tons of trevira to be hydrolyzed in waste water, quite to the about COD of 112.4 ten thousand tons of discharging in water surrounding.
The waste water that caustic reduction processing produces is extremely difficult, the COD of waste water is up to tens thousand of mg/L, and the P-phthalic acid at concentration in waste water and pH value also more high-leveled and difficult with degraded, terephthalic acid has restraining effect to microorganism growth, fish there is is the stimulation toxic, animal is had teratogenesis and mutagenic effect.If without effective pre-treatment, directly enter Sewage treatment systems, be difficult to make subsequent disposal system qualified discharge, will cause serious environmental pollution and the wasting of resources.The most printworks is not paid attention to the alkali decrement waste water pre-treatment, alkali decrement waste water is sneaked into pipe network to be sent into waste water downstream and processes field and unify to process, part factory adopts Waste Sulfuric Acid, simply carry out the acid neutralization precipitation, some factory forces in local environment pressure, spends millions of units, buys 98% the vitriol oil, obtain the impurity such as crude terephthalic acid, process at a low price.Because the basicity of alkali decrement waste water is large, Pollutant levels are high, biodegradability is poor, the organism that adopts biochemical processing method to decompose wherein without pre-treatment needs 1-2 week consuming time or longer time, therefore not pretreated alkali decrement waste water directly mixes with the dyeing and finishing wastewater that other operations produce, and adopts biochemical process to process, and not only construction investment is large, running cost is high, and water outlet is difficult to reach emission standard.
In order to reduce the pollution of alkali decrement waste water to surrounding environment, people had proposed many schemes and attempting reclaiming terephthalic acid from alkali decrement waste waters in recent years.As maximum in foreign study Japan, Korea S and U.S. of mainly concentrating on, main method has: (1) directly obtains the TA(terephthalic acid to adding the acid neutralization in waste water); (2) allow alkali decrement waste water pass through ion-exchange membrane or with the first filtering and impurity removing matter of ultrafiltration, then with acid, neutralize; (3) under High Temperature High Pressure with acid neutralization, for example at 120 ℃, 1.7 more than normal atmosphere; (4) acid neutralization reclaims TA in two steps, and for example first acid adding, to regulating pH to 5-6, is removed the TA that separates out, then acid adding is regulated PH to 2-4, recovery TA.The dyeing alkali decrement waste water generally adopts acid-precipitation method at home: namely utilize and add sulfuric acid, the method that TA separates out.Generally first the alkali decrement waste water pH value is adjusted to 2-4, TA separates out from waste water, and the clearance that clearance reaches 70%, COD also hangs down less than 70%.PH as the Chinese invention patent alkali decrement waste water of publication number CN101244857A is adjusted to 6.5-7, carry out acid out to the solution that contains terephthalic acid, the gained terephthalic acid is carried out esterification under methyl alcohol exists, obtain raw product TA.
And for example publication number CN102219672A Chinese invention patent alkali decrement waste water residue is produced pure terephthalic acid's method and device thereof, it is characterized in that comprising dissolving decolouring, distillation, decolouring for the second time, crystallization, recovery etc.
Above-mentioned recovery method exists the acid out technology simple, easy to operate, deficiency is: the terephthalic acid impurity that reclaim (1) is more, purity is not high, make alkali decrement waste water pH be reduced to 2-4 by 12-14, the mineral acid consumption is larger, working cost improves, and the processing cost of reporting waste water per ton is arranged, and approximately 8-12 is first.(2) NaOH in waste water is neutralized by sulfuric acid and does not recycle, the waste resource.(3) the TA particle that goes out of acid out is very tiny, and particle diameter, take 5um as main, suspends and is difficult to sedimentation for a long time in water, and precipitate and separate is difficulty comparatively, and the TA dehydration property is poor.In order to overcome the deficiency of above-mentioned recovery process, after trying to reclaim, people utilize the method for solvent recrystallization to improve the purity that reclaims TA, as adopt pyridine, DMSO, dimethyl formamide etc. as solvent, the TA that reclaims is carried out recrystallization, but this kind solvent is easy and the TA combination, produce byproduct, and cost is too high, is unfavorable for practical application.In addition, someone has adopted CaCL
2Process alkali decrement waste water, make TA become the terephthalic acid calcium deposit, recycling, but because the TA that reclaims equivalent weight needs 1-2 CaCL doubly
2Raw material, cost are very high, and economic and practical is poor.
nowadays, development along with the polymer material film science and technology, someone tries to adopt membrane separation technique to process alkali decrement waste water, reported as patent publication No. CN101148298A the method that the integrated processing of a kind of method for alkali decrement waste water by film is reclaimed, the method by Chen Huanlin etc. adopt pre-treatment+ultrafiltration+nanofiltration recycled waste water in most NaOH, recycle the characteristics such as water resources of 80-90%, this method reclaims pre-treatment needs flocculation, the complicated technologies such as filtration, easy-regulating not, and in operating process, the film obstruction that micropartical and colloidal thing cause can make filtration velocity reduce.Therefore, find new membrane technique and process the alkali decrement waste water recovery process, just seeming particularly must be with important.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of simple to operate, method that the alkali decrement waste water pre-treatment is few, production cost is low, the printing and dyeing alkali decrement waste water film of saving water resource reclaims terephthalic acid and sodium hydroxide of printing and dyeing.
For solving the problems of the technologies described above, the invention provides a kind of alkali decrement waste water film of printing and dyeing and reclaim the method for terephthalic acid and sodium hydroxide, comprise the following steps:
(1) collect the printing and dyeing alkali decrement waste water, adopt polytetrafluoroethylhollow hollow fiber membrane to carry out ultrafiltration, obtain ultrafiltration and concentration liquid and ultrafiltration after ultrafiltration and see through liquid, described ultrafiltration pressure is 0.1-0.3MPa,
(2) ultrafiltration and concentration liquid is entered sewage farm,
(3) ultrafiltration is seen through liquid and carry out nanofiltration through the selectivity nanofiltration membrane component, obtain nanofiltration concentrated solution and nanofiltration after nanofiltration and see through liquid, described nanofiltration pressure is 0.2-0.5MPa,
(4) add the vitriol oil to regulate pH value to 2-3 to the nanofiltration concentrated solution, separate out terephthalic acid, recycling use after mother liquid disposal,
(5) nanofiltration is dilute solution of sodium hydroxide through liquid, and cyclically utilizing is in mercerizing tange or alkali number machine explained hereafter.
In a preferred embodiment of the present invention, in described step (1), the ultrafiltration of gained is below 0.2 μ m through the granular size in liquid, described ultrafiltration sees through the long-pending 90-95% that accounts for described printing and dyeing alkali decrement waste water treatment capacity of liquid, and it is 13-14 that described ultrafiltration sees through liquid PH scope.
In a preferred embodiment of the present invention, ultrafiltration in described step (3) obtains the nanofiltration concentrated solution of 10-20% volume through liquid after nanofiltration and the nanofiltration of 80-90% volume sees through liquid, the granular size that described nanofiltration sees through in liquid is below 0.001 μ m, and it is 12-14 that described nanofiltration sees through liquid PH scope.
In a preferred embodiment of the present invention, the purity of the terephthalic acid goods of separating out in described step (4) is more than 95%, and water ratio is 10-20%.
In a preferred embodiment of the present invention, the nanofiltration in described step (5) sees through in liquid and adds sheet alkali, and the mixed solution cyclically utilizing that obtains is in mercerizing tange or alkali number machine explained hereafter, and described nanofiltration per ton sees through the sheet alkali that adds 10-100kg in liquid.
The invention has the beneficial effects as follows: the present invention prints and dyes that the alkali decrement waste water film reclaims that the method printing and dyeing alkali decrement waste water pre-treatment of terephthalic acid and sodium hydroxide is few, simple to operate, the load, the difficult problem that effectively solves discharged wastewater met the national standard that have reduced subsequent wastewater treatment technique, reach and administer pollution, saving water resource, reduced production cost, realize economic benefit and environmental benefit bumper harvests.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, in below describing embodiment, the accompanying drawing of required use is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings, wherein:
Fig. 1 is the schematic flow sheet that printing and dyeing alkali decrement waste water film of the present invention reclaims the embodiment of the method 1 of terephthalic acid and sodium hydroxide;
Fig. 2 is that printing and dyeing alkali decrement waste water film of the present invention reclaims terephthalic acid and the embodiment of the method 2 of sodium hydroxide and the schematic flow sheet of embodiment 3.
Embodiment
Below will the technical scheme in the embodiment of the present invention be clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making all other embodiment that obtain under the creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
As shown in Figure 1: a kind of alkali decrement waste water film of printing and dyeing reclaims the method for terephthalic acid and sodium hydroxide, comprises the following steps:
(1) collect the printing and dyeing alkali decrement waste water, adopt polytetrafluoroethylhollow hollow fiber membrane to carry out ultrafiltration, obtain ultrafiltration and concentration liquid and ultrafiltration after ultrafiltration and see through liquid, described ultrafiltration pressure is 0.3MPa,
(2) ultrafiltration and concentration liquid is entered sewage farm,
(3) see through in liquid and add the vitriol oil to regulate pH value to 2 to ultrafiltration, separate out terephthalic acid,
In addition, in described step (1), the ultrafiltration of gained is below 0.2 μ m through the granular size in liquid, described ultrafiltration sees through long-pending 90% of the described printing and dyeing alkali decrement waste water treatment capacity that accounts for of liquid, long-pending 10% of the described printing and dyeing alkali decrement waste water treatment capacity that accounts for of ultrafiltration and concentration liquid, and it is 13 that described ultrafiltration sees through liquid PH.
Polytetrafluoroethylhollow hollow fiber membrane can be held back the impurity such as throw out of 0.02-0.2um size, only have particle can see through polytetrafluoroethylhollow hollow fiber membrane less than the material of 0.02um and enter ultrafiltration and see through in liquid, and greater than the granule foreign of 0.02um, remain in ultrafiltration and concentration liquid and enter sewage farm.
See through in liquid and add the vitriol oil to regulate pH value to 2 to ultrafiltration in step (3), separate out terephthalic acid, leach terephthalic acid and obtain colourless terephthalic acid raw product, described terephthalic acid raw product purity range is 70-85%, wherein the rate of recovery of terephthalic acid reaches more than 70%, in the present embodiment 1, be that 13 ultrafiltration sees through in liquid and adds the vitriol oil to regulate pH value to 2 to PH, separate out the terephthalic acid raw product, described phthalic acid raw product purity is 70%, and wherein the rate of recovery of terephthalic acid is 70%.
Embodiment 2
As shown in Figure 2: a kind of alkali decrement waste water film of printing and dyeing reclaims the method for terephthalic acid and sodium hydroxide, comprises the following steps:
(1) collect the printing and dyeing alkali decrement waste water, adopt polytetrafluoroethylhollow hollow fiber membrane to carry out ultrafiltration, obtain ultrafiltration and concentration liquid and ultrafiltration after ultrafiltration and see through liquid, described ultrafiltration pressure is 0.1MPa,
(2) ultrafiltration and concentration liquid is entered sewage farm,
(3) ultrafiltration is seen through liquid and carry out nanofiltration through the selectivity nanofiltration membrane component, obtain nanofiltration concentrated solution and nanofiltration after nanofiltration and see through liquid, described nanofiltration pressure is 0.2MPa,
(4) add the vitriol oil to regulate pH value to 2 to the nanofiltration concentrated solution, separate out terephthalic acid, recycling use after mother liquid disposal,
(5) nanofiltration is dilute solution of sodium hydroxide through liquid, and cyclically utilizing is in mercerizing tange or alkali number machine explained hereafter.
In addition, in described step (1), the ultrafiltration of gained is below 0.2 μ m through the granular size in liquid, and described ultrafiltration sees through long-pending 90% of the described printing and dyeing alkali decrement waste water treatment capacity that accounts for of liquid, and it is 13 that described ultrafiltration sees through liquid PH.
In addition, the ultrafiltration in described step (3) obtains the nanofiltration concentrated solution of 5% volume through liquid after nanofiltration and the nanofiltration of 95% volume sees through liquid, and the granular size that described nanofiltration sees through in liquid is below 0.001 μ m, and it is 12 that described nanofiltration sees through liquid PH.
Described selectivity nanofiltration membrane component can be held back the impurity such as throw out of 0.001-0.2um size, thereby only have particle can enter nanofiltration through in liquid through the selectivity nanofiltration membrane component less than the material of 0.001um, and greater than the granule foreign of 0.001um, remain in the nanofiltration concentrated solution.
In addition, the purity of the terephthalic acid goods of separating out in described step (4) is 95%, and water ratio is 20%, and the rate of recovery of terephthalic acid is 95%.
In addition, the nanofiltration in described step (5) sees through in liquid and adds sheet alkali, and the mixed solution cyclically utilizing that obtains is in mercerizing tange or alkali number machine explained hereafter, and described nanofiltration per ton sees through the sheet alkali that adds 10kg in liquid.After adding sheet alkali adjustment concentration, can improve the utilization ratio of water resources in alkali decrement production technique with recycling, reduced the waste of water resources, reduced production cost, reduced environmental pollution.
Embodiment 3
Again as shown in Figure 2: a kind of alkali decrement waste water film of printing and dyeing reclaims the method for terephthalic acid and sodium hydroxide, comprises the following steps:
(1) collect the printing and dyeing alkali decrement waste water, adopt polytetrafluoroethylhollow hollow fiber membrane to carry out ultrafiltration, obtain ultrafiltration and concentration liquid and ultrafiltration after ultrafiltration and see through liquid, described ultrafiltration pressure is 0.3MPa,
(2) ultrafiltration and concentration liquid is entered sewage farm,
(3) ultrafiltration is seen through liquid and carry out nanofiltration through the selectivity nanofiltration membrane component, obtain nanofiltration concentrated solution and nanofiltration after nanofiltration and see through liquid, described nanofiltration pressure is 0.5MPa,
(4) add the vitriol oil to regulate pH value to 3 to the nanofiltration concentrated solution, separate out terephthalic acid, recycling use after mother liquid disposal,
(5) nanofiltration is dilute solution of sodium hydroxide through liquid, and cyclically utilizing is in mercerizing tange or alkali number machine explained hereafter.
In addition, in described step (1), the ultrafiltration of gained is below 0.2 μ m through the granular size in liquid, and described ultrafiltration sees through long-pending 95% of the described printing and dyeing alkali decrement waste water treatment capacity that accounts for of liquid, and it is 14 that described ultrafiltration sees through liquid PH.
In addition, the ultrafiltration in described step (3) obtains the nanofiltration concentrated solution of 10% volume through liquid after nanofiltration and the nanofiltration of 90% volume sees through liquid, and the granular size that described nanofiltration sees through in liquid is below 0.001 μ m, and it is 14 that described nanofiltration sees through liquid PH.
Described selectivity nanofiltration membrane component can be held back the impurity such as throw out of 0.001-0.2um size, thereby only have particle can enter nanofiltration through in liquid through the selectivity nanofiltration membrane component less than the material of 0.001um, and greater than the granule foreign of 0.001um, remain in the nanofiltration concentrated solution.
In addition, the purity of the terephthalic acid goods of separating out in described step (4) is 99%, and water ratio is 10%, and the rate of recovery of terephthalic acid is 98%.
In addition, the nanofiltration in described step (5) sees through in liquid and adds sheet alkali, and the mixed solution cyclically utilizing that obtains is in mercerizing tange or alkali number machine explained hereafter, and described nanofiltration per ton sees through the sheet alkali that adds 100kg in liquid.After adding sheet alkali adjustment concentration, can improve the utilization ratio of water resources in alkali decrement production technique with recycling, reduced the waste of water resources, reduced production cost, reduced environmental pollution.
be different from prior art, the present invention's method that the alkali decrement waste water film reclaims terephthalic acid and sodium hydroxide of printing and dyeing adopts the polytetrafluoroethylhollow hollow fiber ultra-filtration membrane first, selective separation nanofiltration membrane separation purification integrated technique, all can process the alkali decrement waste water that dyeing and printing process produces, the terephthalic acid and the sodium hydroxide solution that reclaim all have very high practical value, the printing and dyeing alkali decrement waste water that the present invention will collect carries out ultrafiltration by polytetrafluoroethylhollow hollow fiber membrane and obtains ultrafiltration through liquid, again ultrafiltration is seen through liquid and undertaken by the selectivity nanofiltration membrane component that nanofiltration obtains the nanofiltration concentrated solution and nanofiltration sees through liquid, add the vitriol oil to separate out terephthalic acid in the nanofiltration concentrated solution, recycling use after mother liquid disposal, after adding sheet alkali to adjust concentration in nanofiltration sees through liquid, cyclically utilizing is in mercerizing tange or alkali number machine explained hereafter, the advantage of the inventive method is: the terephthalic acid in (1) recovery and purification alkali decrement waste liquid, (2) the NaOH solution in recycling alkali decrement waste liquid, (3) save and utilized 80～90% water resources, (4) reduce the consumption of the vitriol oil in acid out technique, (5) remove the approximately content of 70% above COD of dyeing waste water, (6) reduced and separated out, precipitation, filter, the cost of dehydration.
The present invention prints and dyes that the alkali decrement waste water film reclaims that the method printing and dyeing alkali decrement waste water pre-treatment of terephthalic acid and sodium hydroxide is few, simple to operate, the load, the difficult problem that effectively solves discharged wastewater met the national standard that have reduced subsequent wastewater treatment technique, reach and administer pollution, saving water resource, reduced production cost, realize economic benefit and environmental benefit bumper harvests.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or equivalent flow process conversion that utilizes description of the present invention to do; or directly or indirectly be used in other relevant technical field, all in like manner be included in scope of patent protection of the present invention.
Claims (5)
1. the method for alkali decrement waste water film recovery terephthalic acid and sodium hydroxide of printing and dyeing, is characterized in that, comprises the following steps:
(1) collect the printing and dyeing alkali decrement waste water, adopt polytetrafluoroethylhollow hollow fiber membrane to carry out ultrafiltration, obtain ultrafiltration and concentration liquid and ultrafiltration after ultrafiltration and see through liquid, described ultrafiltration pressure is 0.1-0.3MPa,
(2) ultrafiltration and concentration liquid is entered sewage farm,
(3) ultrafiltration is seen through liquid and carry out nanofiltration through the selectivity nanofiltration membrane component, obtain nanofiltration concentrated solution and nanofiltration after nanofiltration and see through liquid, described nanofiltration pressure is 0.2-0.5MPa,
(4) add the vitriol oil to regulate pH value to 2-3 to the nanofiltration concentrated solution, separate out terephthalic acid, recycling use after mother liquid disposal,
(5) nanofiltration is dilute solution of sodium hydroxide through liquid, and cyclically utilizing is in mercerizing tange or alkali number machine explained hereafter.
2. printing and dyeing alkali decrement waste water film according to claim 1 reclaims the method for terephthalic acid and sodium hydroxide, it is characterized in that, in described step (1), the ultrafiltration of gained is below 0.2 μ m through the granular size in liquid, described ultrafiltration sees through the long-pending 90-95% that accounts for described printing and dyeing alkali decrement waste water treatment capacity of liquid, and it is 13-14 that described ultrafiltration sees through liquid PH scope.
3. printing and dyeing alkali decrement waste water film according to claim 1 reclaims the method for terephthalic acid and sodium hydroxide, it is characterized in that, ultrafiltration in described step (3) obtains the nanofiltration concentrated solution of 10-20% volume through liquid after nanofiltration and the nanofiltration of 80-90% volume sees through liquid, the granular size that described nanofiltration sees through in liquid is below 0.001 μ m, and it is 12-14 that described nanofiltration sees through liquid PH scope.
4. printing and dyeing alkali decrement waste water film according to claim 1 reclaims the method for terephthalic acid and sodium hydroxide, it is characterized in that, the purity of the terephthalic acid goods of separating out in described step (4) is more than 95%, and water ratio is 10-20%.
5. printing and dyeing alkali decrement waste water film according to claim 1 reclaims the method for terephthalic acid and sodium hydroxide, it is characterized in that, nanofiltration in described step (5) sees through in liquid and adds sheet alkali, the mixed solution cyclically utilizing that obtains is in mercerizing tange or alkali number machine explained hereafter, and described nanofiltration per ton sees through the sheet alkali that adds 10-100kg in liquid.
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| CN104261586A (en) * | 2014-09-22 | 2015-01-07 | 江苏久吾高科技股份有限公司 | Membrane treatment process for alkali minimization wastewater |
| CN105668862A (en) * | 2016-04-15 | 2016-06-15 | 林淑录 | Method for recycling sodium hydroxide containing waste water in silicon wafer production process |
| CN106336090A (en) * | 2016-11-17 | 2017-01-18 | 无锡明盛纺织机械有限公司 | Anaerobic and aerobiotic-adsorption-nanofiltration treatment process for alkali-decrement wastewater in printing and dyeing industry |
| CN106565466A (en) * | 2015-10-09 | 2017-04-19 | 中国石化仪征化纤有限责任公司 | Preparation method of purified terephthalic acid |
| CN108946873A (en) * | 2018-06-19 | 2018-12-07 | 苏州新能环境技术股份有限公司 | A kind of technique that embrane method processing alkali decrement waste water realizes lye reuse and antimony removal |
| KR20220027594A (en) * | 2020-08-27 | 2022-03-08 | (주)대광솔루션 | Method for treating wastewater containing terephthalic acid |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104261586A (en) * | 2014-09-22 | 2015-01-07 | 江苏久吾高科技股份有限公司 | Membrane treatment process for alkali minimization wastewater |
| CN104261586B (en) * | 2014-09-22 | 2016-01-20 | 江苏久吾高科技股份有限公司 | A kind of membrane method treating process of alkali decrement waste water |
| CN106565466A (en) * | 2015-10-09 | 2017-04-19 | 中国石化仪征化纤有限责任公司 | Preparation method of purified terephthalic acid |
| CN105668862A (en) * | 2016-04-15 | 2016-06-15 | 林淑录 | Method for recycling sodium hydroxide containing waste water in silicon wafer production process |
| CN106336090A (en) * | 2016-11-17 | 2017-01-18 | 无锡明盛纺织机械有限公司 | Anaerobic and aerobiotic-adsorption-nanofiltration treatment process for alkali-decrement wastewater in printing and dyeing industry |
| CN108946873A (en) * | 2018-06-19 | 2018-12-07 | 苏州新能环境技术股份有限公司 | A kind of technique that embrane method processing alkali decrement waste water realizes lye reuse and antimony removal |
| KR20220027594A (en) * | 2020-08-27 | 2022-03-08 | (주)대광솔루션 | Method for treating wastewater containing terephthalic acid |
| KR102403442B1 (en) * | 2020-08-27 | 2022-05-27 | (주)대광솔루션 | Method for treating wastewater containing terephthalic acid |
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Application publication date: 20131113 |