CN1209419A - Noval method for treatment of nitro-waste-water - Google Patents
Noval method for treatment of nitro-waste-water Download PDFInfo
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- CN1209419A CN1209419A CN 97109205 CN97109205A CN1209419A CN 1209419 A CN1209419 A CN 1209419A CN 97109205 CN97109205 CN 97109205 CN 97109205 A CN97109205 A CN 97109205A CN 1209419 A CN1209419 A CN 1209419A
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Abstract
The method for treating nitro waste water is characterized by that said invention adopts the processes of organic solvent extraction, steam stripping and adsorption to treat nitro waste water to make its discharged water completely meet the national discharge standard and can be directly discharged or returned to reuse. Said organic solvent and adsorbent can also be respectively recovered, regenerated and returned to reuse, and the useful nitro compound being in the waste water can also be recovered. Said invented method is simple in operation, and its treatment effect is good.
Description
The present invention relates to a kind of method of Industrial Wastewater Treatment, belong to the environmental chemistry technical field.
Nitro-compound generally has the almond flavor, is colourless or faint yellow solid or liquid at normal temperatures.Be soluble in organic solvent, be insoluble in water.
Nitro-compound has toxicity, can act on liver, kidney, suppresses nervus centralis, can cause septicemia.Can be through breathing and skin absorption human body.The nitro-compound molecule imports other element or group, increases as halogen, hydroxyl, toxicity.When importing alkyl, hydroxyl, sulfonic group, toxicity reduces.Nitro is many more in the compound molecule, and toxicity is strong more.Nitro-compound is also rich explosive.
Oil of mirbane, nitrobenzene compounds are important material for industrial production or intermediates such as dyestuff, medicine, chemical industry, explosive, agricultural chemicals and organic synthesis.Therefore, contain the nitro-compound of high density in a large amount of waste water that produced in the above-mentioned industrial production, directly discharging will cause extremely serious pollution to environment if it is not handled.
Reported in literature contain the nitro compound wastewater treatment method have multiple, as distillation method [zetkin VI eta1.Khim.prom., 1973,49 (5), 347-348]; Coagulant sedimentation [Pollozec.F.A., Geroffen 2336627]; Absorption method [period-luminosity state etc., Sichuan environment, 1986,5 (1), 53-58]; Extraction process [Hej-da, z.et a1.Czech 206757]; The biochemical treatment process [Sun Jixian, environmental engineering, 1992,10 (5) 7-10] and the precipitator method [environmental chemistry such as Zhao Lihui, 1985,4 (3), 40-45].
In a word, the Research on Treatment of nitrobenzene wastewater has all been carried out a large amount of, extensive studies both at home and abroad, has obtained certain achievement.But because nitro-compound is that a toxicity is big, the compound of difficult degradation, the composition of adding waste water is very complicated, chemical oxygen demand (COD) and biological oxygen demand (BOD) (BOD
5) height, more increase its intractability.With all not being up to state standards after the aforesaid method processing.The external general high temperature incineration method that adopts, this method needs large-scale specific equipment, and investment is big, the cost height, difficulty is given popularization.
Therefore, the trade effluent high to nitro-compound content, also inreal at present economic, effective treatment process is applied.
In order to overcome the deficiencies in the prior art, the present invention intends providing a kind of novel method of cost-effective processing nitrobenzene wastewater, should reach discharging standards fully with the water after this method processing, and, solvent that this method is used and sorbent material are reused after should be able to reclaiming, regenerating, and can extract useful nitro-compound from waste water.
Be the technical scheme that realizes that above-mentioned purpose of the present invention adopts:
1. the trade effluent that will contain nitro-compound is used the extraction solvent fractional extraction 1～5 time at normal temperatures, also can adopt counter current continuous extraction, and the volume ratio of solvent and water is 1: 1～1: 10, and the extraction time is 3～5min at every turn, leaves standstill after the extraction to plant the back separation somewhat;
2. the water after extraction feeds water vapor and carries out stripping 3～5min and adopt condensing works to reclaim extraction solvent in being soluble in the aqueous phase simultaneously;
3. will be controlled at 1～2.5 scope through extraction, the pH value of water behind the stripping, pass through adsorption column then, perhaps add 20～60 purpose sorbent materials, consumption is 10～20g/L water, stirs 2～3 hours after-filtration, and water outlet has promptly met discharging standards, can directly discharge, also can return use.
Organic solvent is reclaimed in the distillation under normal pressure or decompression of organic phase after the above-mentioned extraction, and residue is to can further extracting useful nitro-compound, as p-nitroacetophenone, phenylformic acid etc.
Filter residue after the adsorption treatment can carry out heat regeneration and reclaim sorbent material about 300 ℃, the absorption property index of the sorbent material after the regeneration can return to the level before the absorption substantially.
By technical scheme of the present invention, the boiling point of described extraction solvent is lower than 150 ℃ acetates, as N-BUTYL ACETATE, amyl acetate-n, isoamyl acetate etc.Described sorbent material is a gac, and granularity is 20～60 ℃ of order scopes.
During extraction, the pH value of waste water has a significant impact effect of extracting, and preferred pH value is 1～2, with PH is 1.5 to be the best, and the volume influence of extraction solvent and waste water is 1: 1～1: 10, preferred range is 1: 1～1～: 3, optimum proportion is 1: 2.5, and most preferred extraction progression is 3 times.
During adsorption treatment, preferred condition is PH＜2, temperature＜20 ℃.When the sorbent material granularity is 50～60 ℃ of orders, adsorption effect the best.
Adopt the obtained unusual effect of technical scheme of the present invention:
1. the present invention adopts extraction-stripping-absorption coupling technique that high-load nitrobenzene wastewater is handled, and its working method is simple, mild condition, and treatment effect is good, and is reliable and stable.The main discharge index of this type of waste water of national regulation is: chemical oxygen demand cod＜400mg/L, nitro-compound content＜5mg/L, and the water outlet COD＜300mg/L after the method processing of the present invention, nitro-compound content＜3mg/L, reached discharging standards fully, can directly discharge, also can return use.
Used extraction agent of present method and sorbent material respectively through distillation reclaim and regeneration after reusable, recovery method economy is simple, and result of use is constant substantially, thereby has saved the cost of wastewater treatment greatly.
3. adopt method of the present invention, can further extract and reclaim useful compound in the waste water, as p-nitroacetophenone, phenylformic acid etc.Offset according to preresearch estimates and two of cost for wastewater treatment and to remain basically stable, even have a small surplus.That is to say, use method of the present invention, under the prerequisite that does not increase production cost, can effectively handle nitrobenzene wastewater.
In a word, technical scheme treatment effect of the present invention is good, and working cost is low, and good economical benefit has tangible environmental benefit and social benefit, has important use to be worth.
Below in conjunction with specific embodiment to technical scheme further instruction of the present invention:
Embodiment:
Nitrobenzene wastewater is taken from certain pharmaceutical factory, and the result is as follows for its analytical test: PH～1.7, COD～4295.2mg/L, nitro-compound content are 1199.2mg/L.
Get waste water 100ml, add N-BUTYL ACETATE 40ml, extract 3 minutes, leave standstill and go out water after separating after 5 minutes, through stripping 3 minutes, adding 1g50～60 purpose gacs in cool to room temperature (～25 ℃) back stirred filtering separation 2 hours with water.Organic phase reclaims solvent after distilling, the absorption filter residue is 300 ℃ of heat regeneration down.The detected result of water outlet is: COD292.8mg/L, nitro-compound 2.6mg/L reaches discharging standards fully.
Claims (6)
1. a novel method of handling nitrobenzene wastewater is characterized in that this method comprises the steps:
1.1 at normal temperatures nitrobenzene wastewater is made extraction solvent extraction 1～5 time or counter current continuous extraction with acetates, the volume ratio of solvent and water is 1: 1～1: 10, extracts 3～5 minutes, separates after leaving standstill several minutes at every turn;
1.2 feeding water vapor, the water after will extracting carried out stripping 3～5 minutes;
1.3 the water behind the stripping perhaps adds 20～60 purpose sorbent materials through adsorption column absorption, consumption is 10～20g/L water, stirs 2～3 hours, and the water outlet after the filtration is directly discharged or reuse.
2. by the novel method of the described processing nitrobenzene wastewater of claim 1, it is characterized in that in step 1.1 that preferred extraction solvent is a N-BUTYL ACETATE.
3. by the described novel method of claim 1, it is characterized in that: the volume ratio of preferred extraction solvent and water is 1: 1～1: 3 during extraction.
4. by the described novel method of claim 3, it is characterized in that most preferred volume ratio is 1: 2.5.
5. by the described novel method of claim 1, it is characterized in that preferred sorbent material is 40～60 purpose gacs.
6. by the described novel method of claim 1, it is characterized in that preferred adsorption conditions is PH≤2, temperature＜20 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97109205 CN1209419A (en) | 1997-08-21 | 1997-08-21 | Noval method for treatment of nitro-waste-water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97109205 CN1209419A (en) | 1997-08-21 | 1997-08-21 | Noval method for treatment of nitro-waste-water |
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| CN1209419A true CN1209419A (en) | 1999-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 97109205 Pending CN1209419A (en) | 1997-08-21 | 1997-08-21 | Noval method for treatment of nitro-waste-water |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101602561B (en) * | 2009-07-07 | 2011-08-17 | 扬州大学 | Process for comprehensive use and treatment of wastewater from chlorobenzene adiabatic nitration material separation |
| CN102295380A (en) * | 2011-08-19 | 2011-12-28 | 杭州江南科学研究院有限公司 | Processing and recovering method of aromatic nitro-compound wastewater |
| CN102531216A (en) * | 2011-12-23 | 2012-07-04 | 蓝星环境工程有限公司 | Process and equipment for processing pesticide wastewater |
| CN106746106A (en) * | 2016-11-15 | 2017-05-31 | 墨宝股份有限公司 | A kind of nitration waste water processing method of energy-conserving and environment-protective |
-
1997
- 1997-08-21 CN CN 97109205 patent/CN1209419A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101602561B (en) * | 2009-07-07 | 2011-08-17 | 扬州大学 | Process for comprehensive use and treatment of wastewater from chlorobenzene adiabatic nitration material separation |
| CN102295380A (en) * | 2011-08-19 | 2011-12-28 | 杭州江南科学研究院有限公司 | Processing and recovering method of aromatic nitro-compound wastewater |
| CN102531216A (en) * | 2011-12-23 | 2012-07-04 | 蓝星环境工程有限公司 | Process and equipment for processing pesticide wastewater |
| CN102531216B (en) * | 2011-12-23 | 2013-10-30 | 蓝星环境工程有限公司 | Process and equipment for processing pesticide wastewater |
| CN106746106A (en) * | 2016-11-15 | 2017-05-31 | 墨宝股份有限公司 | A kind of nitration waste water processing method of energy-conserving and environment-protective |
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