CN1188355C - Method for treating high concentration m-phthalic acid mixed waste water - Google Patents
Method for treating high concentration m-phthalic acid mixed waste water Download PDFInfo
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- CN1188355C CN1188355C CNB011348690A CN01134869A CN1188355C CN 1188355 C CN1188355 C CN 1188355C CN B011348690 A CNB011348690 A CN B011348690A CN 01134869 A CN01134869 A CN 01134869A CN 1188355 C CN1188355 C CN 1188355C
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- waste water
- phthalic acid
- acid mixed
- high concentration
- mixed waste
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The present invention relates to a method for treating wastewater, particularly to a method for treating m-phthalic acid wastewater. The method is characterized in that the pretreatment is carried out to m-phthalic acid wastewater in a free radical polymerization and flocculation method. Firstly, the molecule structure of compounds in the wastewater is changed in a polymerization method, the solubility of the compounds in the wastewater is lowered to enable the compounds to be formed into granules or colloid, and the granules or the colloid is precipitated in a flocculation method. The COD concentration of the wastewater is lowered after the pretreatment is carried out to the wastewater, and the pretreated wastewater can reach standard discharge by biochemical treatment.
Description
Technical field:
The present invention relates to a kind of method of waste water treatment, say further, relate to a kind of method that m-phthalic acid is produced waste discharge of handling.
Background technology:
M-phthalic acid is a kind of novel Chemicals, is mainly used in the industries such as chemical fibre and polyester, and be a kind of novel additive.M-phthalic acid can change product performance after adding products such as chemical fibre and polyester, improves the quality of products.But consequent high concentration m-phthalic acid mixed waste water as effectively not handling, can produce serious pollution to environment.
At present, domestic manufacturer mainly adopts neutralization and biochemical method that high concentration m-phthalic acid mixed waste water is handled, and does not study at the character of waste water itself and the situation of contained pollutent.And in the biochemical treatment process,, often cause impact to sewage work because of containing a large amount of suspended substances.This simple neutralization method has only been adjusted the pH value, fails the material in the waste water is effectively removed, and has not only increased running cost, also often causes the water outlet phenomenon that exceeds standard.Therefore, study the direction that its high-efficiency pretreatment technology has become Future Development.
Summary of the invention
Problem solved by the invention is how to handle above-described high concentration m-phthalic acid mixed waste water efficiently, enables to reach emission request.The present invention handles m-phthalic acid mixed waste water by chemistry and the method that combines of physics, removes the most COD of waste water, and making it to pass through can qualified discharge after the biochemical treatment.
The invention provides a kind of method of handling high concentration m-phthalic acid mixed waste water.Its characteristics are by the method for radical polymerization and flocculation m-phthalic acid waste water to be handled.At first changed the molecular structure of compound in the waste water by the radical polymerization means, reduced that the solubleness of compound makes it to form small-particle or colloid in the waste water, the method by flocculation makes it precipitation then.This method mainly may further comprise the steps:
A. radical polymerization: in m-phthalic acid mixed waste water, add free-radical initiator, carry out radical polymerization;
B. flocculation sediment: in the waste water after above processing, add coagulating agent and flocculation agent carries out flocculation sediment.
Above-described method of the present invention, the pH scope of the reaction of radical polymerization in step a. is generally 1～7, and its optimum range is 2～3.5.The temperature of reaction is generally 5 ℃～60 ℃.Reaction times was generally 10～120 minutes, and optimum reacting time is 30～50 minutes.Add free-radical initiator and comprise K
2S
2O
3Or (NH
4)
2S
2O
8With following any one material be the composite initiator that 1: 1～3: 1 ratio is formed: NaHSO with weight ratio
3, Na
2S
2O
3, AgNO
3The total add-on of composite initiator is 0.1～1% of a waste water gross weight, and optimal addn is 0.2～0.4% of a waste water gross weight.
Behind the above-mentioned Raolical polymerizable, add coagulating agent in the waste water and flocculation agent carries out flocculation sediment.The pH value of this step of flocculation precipitation is between 5～8 in the present invention.Coagulating agent can be aluminium salt such as Tai-Ace S 150, aluminium chlorohydroxide, polyaluminium sulfate etc., or in molysite such as iron trichloride, the polymerization iron etc. any one, or the combination of the above material.Wherein polymerization iron comprises poly-ferric chloride, aluminium iron polychloride, polymeric silicicacid ferric sulfate, polymerization sulfuric chlorohydrin iron, polymeric silicicacid iron, polymeric aluminium ferrum silicate, polymer phosphate ferro-aluminum etc.The coagulating agent add-on is 1000～5000ppm of waste water gross weight, and optimal addn is waste water gross weight 1000～3000ppm.Flocculation agent is an anion-polyacrylamide, and its molecular weight is more preferably greater than equaling 9,000,000, and its add-on is 1～10ppm of waste water gross weight, and optimal addn is waste water gross weight 3～5ppm.
In addition, m-phthalic acid mixed waste water can carry out common aerobic biodegradation after treatment in the method for the present invention.Aerobic treatment adopts common soft-filler contact biological oxidation process, gas-water ratio 15: 1～25: 1,8～12 hours residence time.
High concentration m-phthalic acid mixed waste water can reduce COD in a large number after step a. of the present invention and step b. processing, COD can drop to 2000mg/L from about 6500mg/L, and average COD decreases by 70%, BOD
5/ COD reaches more than 0.6.But this waste water is qualified discharge after biochemical treatment again, has solved the problem of m-phthalic acid waste water treatment difficulty.
Embodiment
Used K in following examples
2S
2O
3, (NH
4)
2S
2O
8, NaHSO
3, Tai-Ace S 150, anion-polyacrylamide and sodium chlorate be chemical pure, all get by commercially available.
Embodiment 1
Beijing inter-plant phthalic acid waste water COD is 6500mg/l, is that to add weight ratio under 3 the condition be 1: 1 K at pH
2S
2O
3With NaHSO
3The add-on of this composite initiation system is 0.4% of a waste water gross weight, 25 ℃ of temperature of reaction, 50 minutes reaction times, add Tai-Ace S 150 then, add-on is the 2000ppm of waste water gross weight, be to stir under 6.5 the condition to add anion-polyacrylamide (molecular weight is more than or equal to 9,000,000) after 1 minute at pH, add-on is the 5ppm of waste water gross weight, the COD of water outlet is 2000mg/l behind flocculation sediment, the COD clearance is 70%, then pretreated waste water is carried out aerobic-bio-contact oxidation and handles, water inlet COD1000mg/l, hold concurrently 6 hours oxygen residence time, 10 hours bio-contact oxidation residence time, gas-water ratio 21: 1, discharging water outlet COD after treatment is less than 150mg/l.
Embodiment 2
At above-mentioned same waste water, we adopt weight ratio is 1: 1 (NH
4)
2S
2O
8With NaHSO
3The complex initiator of forming carries out wastewater treatment test, be under 3.5 the condition at pH, the composite initiator add-on is 0.2% of a waste water gross weight, 35 ℃ of temperature of reaction, 30 minutes reaction times, add Tai-Ace S 150 then, add-on is the 2000ppm of waste water gross weight, after being to stir 1 minute 6.5 times, pH adds anion-polyacrylamide (molecular weight is more than or equal to 9,000,000), add-on is the 5ppm of waste water gross weight, water outlet COD also can reach 2000mg/l behind flocculation sediment, and the COD clearance is 70%.Then pretreated waste water is carried out aerobic-bio-contact oxidation and handle, water inlet COD1000mg/l holds concurrently 6 hours oxygen residence time, 10 hours bio-contact oxidation residence time, and gas-water ratio 21: 1, discharging water outlet COD after treatment is less than 150mg/l.
Comparative Examples 1
At above-mentioned same waste water, we adopt single initiator such as sodium chlorate, add-on is 0.4% of a waste water gross weight, under the pH3 condition, same 25 ℃ of temperature of reaction, 60 minutes reaction times, add Tai-Ace S 150 then, add-on is the 2000ppm of waste water gross weight, add anion-polyacrylamide (molecular weight is more than or equal to 9,000,000) after pH is to stir 1 minute 6.5 times, add-on is the 5ppm of waste water gross weight, and water outlet COD is 4200mg/l behind flocculation sediment, the COD clearance has only 35%, and treatment effect is bad.Therefore, can prove that adopt composite initiator to carry out Raolical polymerizable and handle m-phthalic acid waste water, treatment effect is better.
Therefore, handle m-phthalic acid mixed waste water, under certain treatment process condition, can reach treatment effect preferably through the above-mentioned initiator that adopts complex that experiment showed.
Claims (12)
1. method of handling high concentration m-phthalic acid mixed waste water may further comprise the steps:
A. radical polymerization: add free-radical initiator in m-phthalic acid mixed waste water, carry out radical polymerization, temperature of reaction is 25 ℃～60 ℃, and the pH scope is 1～3.5;
B. flocculation sediment: in the waste water after above processing, add coagulating agent and flocculation agent carries out flocculation sediment.
2. by the method for the described processing high concentration m-phthalic acid mixed waste water of claim 1, it is characterized in that free-radical initiator comprises K among the described step a.
2S
2O
3Or (NH
4)
2S
2O
8With following any one material be the composite initiator that 1: 1～3: 1 ratio is formed: NaHSO with weight ratio
3, Na
2S
2O
3
3. by the method for claim 1 or 2 described processing high concentration m-phthalic acid mixed waste waters, it is characterized in that total consumption of Raolical polymerizable free-radical initiator is 0.1～1% of a waste water gross weight among the described step a..
4. by the method for the described processing high concentration m-phthalic acid mixed waste water of claim 3, it is characterized in that total consumption of Raolical polymerizable free-radical initiator is 0.2～0.4% of a waste water gross weight among the described step a..
5. by the method for the described processing high concentration m-phthalic acid mixed waste water of claim 1, the reaction times that it is characterized in that Raolical polymerizable among the described step a. is 10～120 minutes.
6. by the method for the described processing high concentration m-phthalic acid mixed waste water of claim 1, the pH scope that it is characterized in that Raolical polymerizable among the described step a. is 2～3.5.
7. by the method for the described processing high concentration m-phthalic acid mixed waste water of claim 1, the pH value that it is characterized in that step b. is 5～8.
8. by the method for the described processing high concentration m-phthalic acid mixed waste water of claim 1, it is characterized in that coagulating agent used among the step b. is aluminium salt and/or molysite, used flocculation agent is a molecular weight more than or equal to 9,000,000 anion-polyacrylamide.
9. by the method for the described processing high concentration m-phthalic acid mixed waste water of claim 8, it is characterized in that coagulating agent used among the step b. comprises a kind of or its combination in Tai-Ace S 150, aluminium chlorohydroxide, polyaluminium sulfate, iron trichloride, the polymerization iron.
10. by the method for the described processing high concentration m-phthalic acid mixed waste water of claim 1, the add-on that it is characterized in that used coagulating agent among the step b. is 1000～5000ppm of waste water gross weight; The add-on of used flocculation agent is 1～10ppm of waste water gross weight.
11. by the method for the described processing high concentration m-phthalic acid mixed waste water of claim 10, the add-on that it is characterized in that used coagulating agent among the step b. is 1000～3000ppm of waste water gross weight, the flocculation agent add-on is 3～5ppm of waste water gross weight.
12., it is characterized in that waste water after radical polymerization and flocculation sediment processing, carries out aerobic biodegradation and handles by the method for the described processing high concentration m-phthalic acid mixed waste water of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011348690A CN1188355C (en) | 2001-11-16 | 2001-11-16 | Method for treating high concentration m-phthalic acid mixed waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011348690A CN1188355C (en) | 2001-11-16 | 2001-11-16 | Method for treating high concentration m-phthalic acid mixed waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1420090A CN1420090A (en) | 2003-05-28 |
| CN1188355C true CN1188355C (en) | 2005-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011348690A Expired - Fee Related CN1188355C (en) | 2001-11-16 | 2001-11-16 | Method for treating high concentration m-phthalic acid mixed waste water |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447101C (en) * | 2006-03-17 | 2008-12-31 | 江阴市倪家巷化工有限公司 | Treatment technology of mesitylene amine |
| CN106745996A (en) * | 2016-12-26 | 2017-05-31 | 浙江博超节能科技有限公司 | A kind of organic wastewater treatment process |
| CN115477409B (en) * | 2021-05-31 | 2024-02-13 | 中国石油化工股份有限公司 | HPPO wastewater treatment method |
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