CN105347601A - PVA production wastewater treatment method - Google Patents
PVA production wastewater treatment method Download PDFInfo
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- CN105347601A CN105347601A CN201410408685.3A CN201410408685A CN105347601A CN 105347601 A CN105347601 A CN 105347601A CN 201410408685 A CN201410408685 A CN 201410408685A CN 105347601 A CN105347601 A CN 105347601A
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Abstract
The present invention relates to a wastewater treatment technology, specifically to a PVA production wastewater treatment method, wherein a process comprising ozone, hydrolysis acidification and two-stage aerobic treatment is used to treat PVA production wastewater so as to achieve standard emission. According to the present invention, the ozone is used to pre-treat the PVA production wastewater, the PVA in the wastewater is difficult to remove by the conventional biochemical treatment, the ozone can change the molecular structure of the PVA and improve the biodegradability, and does not provide the significant oxidation effect for the acetic acid in the wastewater, and the acetic acid has good biodegradability, and can be removed through the subsequent hydrolysis acidification and the aerobic treatment; and with the PVA production wastewater treatment method, the emission and treatment difficult problem of the chemical industry wastewater is effectively solved, the significant economic and social benefits are provided, the standard emission of the PVA wastewater is achieved, and the characteristics of stable treatment effect and the easy industrialization achieving are provided.
Description
Technical field
The present invention relates to wastewater processing technology, is a kind for the treatment of process of PVA factory effluent specifically.Espespecially a kind of utilization " ozone+acidication+secondary is aerobic " art breading PVA factory effluent, thus realize the technology of qualified discharge.
Background technology
Chemical industry is the conventional column industry of China, and industrial chemicals and the product of production are widely used in every field, for national economy makes major contribution.Chemical industry is the industry of high pollution, and the organic pollutant of the waste water produced usually containing high density, is difficult to reach qualified discharge by the method for wastewater treatment of routine as biochemical treatment, film process etc., causes immense pressure to environment.
PVA factory effluent is that this waste water has the features such as the water yield is large, organic concentration is high, degradability is poor, belongs to unmanageable trade effluent at the waste water producing the dense difficult degradation of height produced in PVA (polyvinyl alcohol) process.The PVA factory effluent produced for the device of certain chemical enterprise, the pH of waste water is about 5, COD
crbe 1500 ~ 3000mg/L, the principal pollutant contained in waste water are PVA and acetic acid, and because PVA biodegradability is poor, and content is up to 500mg/L, are difficult to be degraded by common biochemical method.
Ozone oxidation is the one of high-level oxidation technology, it can, by the hardly degraded organic substance in oxygenizement water of decomposition, improve the biodegradability of waste water, and the product produced in ozone treating process be very little to environmental influence, as preconditioning technique, ozone has fabulous development prospect.
" acidication+aerobic " technique, as a conventional biochemical processing process, is widely used in the industries such as printing and dyeing, papermaking, pharmacy, chemical industry.Acidication can improve the biodegradability of waste water greatly, thus improves the condition of subsequent biochemical process.Aerobic process, then by the Degradation of microorganism, is removed the pollutent in waste water, is realized the qualified discharge of waste water.
Patent " printing and dyeing wastewater recovery and disposal method " (application number 200510060615.4) describes a kind of process recovery process of desized wastewater.This technique reclaims slurry to desized wastewater by carrying out acid out pre-treatment, then carries out A/O biochemical treatment with dyeing waste-water, then after ozone catalytic advanced treatment, by most of Water circulation in dyeing.
" ozone oxidation-Wastewater Treated by Activated Sludge Process is containing the experimental study of PVA trade effluent " (Xing Xiaoqiong, Huang Chenglan, Liu Min, Chen Ying, environmental science, 2012,33,3853-3858) report a kind of ozone oxidation+activated sludge process that utilizes to the treatment effect of PVA trade effluent.Compared with traditional sludge method, adopt ozone as pre-treatment, biochemical treatment effect can be significantly improved.But in this technique, the PVA content in waste water is only up to 70mg/L, and waste water also needs could realize qualified discharge through processing further after this art breading.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind for the treatment of process of PVA factory effluent, the method utilizes " ozone+acidication+secondary is aerobic " art breading PVA factory effluent, realize the qualified discharge of waste water, there is treatment effect stablize, be easy to realize industrialized feature.
For reaching above object, the technical scheme that the present invention takes is:
A treatment process for PVA factory effluent, utilizes " ozone+acidication+secondary is aerobic " art breading PVA factory effluent, thus realizes qualified discharge.
On the basis of such scheme, the treatment process of described PVA factory effluent, comprises the steps:
Step 1: pre-treatment, adds alkali in PVA factory effluent, by its pH regulator to 6.5 ~ 7.5;
Step 2: ozone oxidation, pretreated PVA factory effluent enters ozone reaction pond, passes into ozone, and in the ozone passed into and waste water, the mass ratio of COD is 1:1 ~ 1:3, and the reaction times is 1 ~ 3h, improves the biodegradability of PVA in waste water;
Step 3: acidication, the PVA factory effluent through ozone Oxidation Treatment enters acidication reaction tank, and sludge concentration is 3 ~ 4g/L, and the residence time is 6 ~ 12h;
Step 4: one-level is aerobic, the PVA factory effluent through acidication process enters one-level aerobic reaction pond, and sludge concentration is 2 ~ 3g/L, and the residence time is 15 ~ 30h;
Step 5: secondary is aerobic, the PVA factory effluent through one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2 ~ 3g/L, and the residence time is 15 ~ 30h, water outlet after sedimentation.
On the basis of such scheme, described PVA factory effluent COD is 1500mg/L ~ 3000mg/L, pH is 4 ~ 6, and pollutent comprises PVA and acetic acid.
On the basis of such scheme, be preferably 8 ~ 10h through the residence time of PVA factory effluent in acidication reaction tank of ozone Oxidation Treatment.
On the basis of such scheme, be preferably 18 ~ 25h through the residence time of PVA factory effluent in one-level aerobic reaction pond of acidication process.
On the basis of such scheme, be preferably 18 ~ 25h through the residence time of PVA factory effluent in secondary aerobic reaction pond of one-level aerobic treatment.
On the basis of such scheme, the effluent quality COD after process is less than 80mg/L, meets emission standard requirement.
The treatment process of PVA factory effluent of the present invention, utilize ozone pre-treatment PVA factory effluent, PVA in waste water is difficult to be removed by common biochemistry, ozone can change the molecular structure of PVA, improve its biodegradability, and for the acetic acid in waste water without obvious oxidation effectiveness, acetic acid biodegradability is good, by sequential hydrolysis acidifying and aerobic removal.
The treatment process of PVA factory effluent of the present invention, efficiently solves the discharge of this type of wastewater from chemical industry and administers a difficult problem, realizing the qualified discharge of waste water, have obvious economic and social benefit.
Accompanying drawing explanation
The present invention has following accompanying drawing:
Fig. 1 process flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, the treatment process of PVA factory effluent of the present invention, utilizes " ozone+acidication+secondary is aerobic " art breading PVA factory effluent, thus realizes qualified discharge.
The treatment process of PVA factory effluent of the present invention, comprises the steps:
Step 1: pre-treatment, adds alkali in PVA factory effluent, by its pH regulator to 6.5 ~ 7.5;
Step 2: ozone oxidation, pretreated PVA factory effluent enters ozone reaction pond, passes into ozone, and in the ozone passed into and waste water, the mass ratio of COD is 1:1 ~ 1:3, and the reaction times is 1 ~ 3h, improves the biodegradability of PVA in waste water;
Step 3: acidication, the PVA factory effluent through ozone Oxidation Treatment enters acidication reaction tank, and sludge concentration is 3 ~ 4g/L, and the residence time is 6 ~ 12h;
Step 4: one-level is aerobic, the PVA factory effluent through acidication process enters one-level aerobic reaction pond, and sludge concentration is 2 ~ 3g/L, and the residence time is 15 ~ 30h;
Step 5: secondary is aerobic, the PVA factory effluent through one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2 ~ 3g/L, and the residence time is 15 ~ 30h, water outlet after sedimentation.
The present invention regulates the pH of PVA factory effluent by pre-treatment, then the biodegradability of sewage is improved by ozone oxidation, ozone is for the removal obvious effect useless of COD, the biodegradability of main raising PVA, acidication is utilized to remove part COD, and improve the biodegradability of sewage, then realize the qualified discharge of waste water by secondary biochemical.
On the basis of technique scheme, as shown in the table, described PVA factory effluent COD is 1500mg/L ~ 3000mg/L, pH is 4 ~ 6, and principal pollutant are PVA and acetic acid.
| Wastewater source | PVA factory effluent |
| pH | 4-6 |
| COD(mg/L) | 1500-3000 |
| Main organic composition | PVA, acetic acid |
On the basis of technique scheme, be preferably 8 ~ 10h through the residence time of PVA factory effluent in acidication reaction tank of ozone Oxidation Treatment.
On the basis of technique scheme, be preferably 18 ~ 25h through the residence time of PVA factory effluent in one-level aerobic reaction pond of acidication process.
On the basis of technique scheme, be preferably 18 ~ 25h through the residence time of PVA factory effluent in secondary aerobic reaction pond of one-level aerobic treatment.
On the basis of technique scheme, the effluent quality COD after process is less than 80mg/L, meets emission standard requirement.
The treatment process of PVA factory effluent of the present invention, has following outstanding substantive distinguishing features and progress:
1) can be changed the molecular structure of PVA in PVA factory effluent by ozone oxidation, improve its biodegradability, ozone does not have obvious oxygenizement for acetic acid simultaneously, can selectively be oxidized, thus reduces the consumption of ozone, reduces process energy consumption;
2) acidication can remove the part COD in PVA factory effluent, and improves the biodegradability of sewage further;
3) one-level is aerobic can acetate fully in degradation water remove most PVA by microbial process;
4) secondary is aerobic can undegradable PVA in advanced treatment of waste water, realizes the advanced treatment of waste water, realizes qualified discharge.
It is below specific embodiment.
Embodiment 1
The PVA factory effluent of certain enterprise, COD is 1500mg/L, pH is 4, and principal pollutant are PVA and acetic acid, adopts method treatment step of the present invention as follows:
Step 1: pre-treatment, adds sodium hydroxide in PVA factory effluent, by its pH regulator to 6.5;
Step 2: ozone oxidation, pretreated PVA factory effluent enters ozone reaction pond, passes into ozone, and in the ozone passed into and waste water, the mass ratio of COD is 1:1, and the reaction times is 1h, improves the biodegradability of PVA in waste water;
Step 3: acidication, the PVA factory effluent through ozone Oxidation Treatment enters acidication reaction tank, and sludge concentration is 3g/L, and the residence time is 12h;
Step 4: one-level is aerobic, the PVA factory effluent through acidication process enters one-level aerobic reaction pond, and sludge concentration is 2g/L, and the residence time is 30h;
Step 5: secondary is aerobic, the PVA factory effluent through one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2g/L, and the residence time is 30h, water outlet after sedimentation.After testing, water outlet COD is 70mg/L, meets emission standard requirement.
Embodiment 2
The PVA factory effluent of certain enterprise, COD is 3000mg/L, pH is 6, and principal pollutant are PVA and acetic acid, adopts method treatment step of the present invention as follows:
Step 1: pre-treatment, adds potassium hydroxide in PVA factory effluent, by its pH regulator to 7.5;
Step 2: ozone oxidation, pretreated PVA factory effluent enters ozone reaction pond, passes into ozone, and in the ozone passed into and waste water, the mass ratio of COD is 1:2, and the reaction times is 3h, improves the biodegradability of PVA in waste water;
Step 3: acidication, the PVA factory effluent through ozone Oxidation Treatment enters acidication reaction tank, and sludge concentration is 4g/L, and the residence time is 6h;
Step 4: one-level is aerobic, the PVA factory effluent through acidication process enters one-level aerobic reaction pond, and sludge concentration is 3g/L, and the residence time is 15h;
Step 5: secondary is aerobic, the PVA factory effluent through one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 3g/L, and the residence time is 15h, water outlet after sedimentation.After testing, water outlet COD is 75mg/L, meets emission standard requirement.
Embodiment 3
The PVA factory effluent of certain enterprise, COD is 2000mg/L, pH is 5, and principal pollutant are PVA and acetic acid, adopts method treatment step of the present invention as follows:
Step 1: pre-treatment, adds sodium hydroxide in PVA factory effluent, by its pH regulator to 7;
Step 2: ozone oxidation, pretreated PVA factory effluent enters ozone reaction pond, passes into ozone, and in the ozone passed into and waste water, the mass ratio of COD is 1:3, and the reaction times is 2h, improves the biodegradability of PVA in waste water;
Step 3: acidication, the PVA factory effluent through ozone Oxidation Treatment enters acidication reaction tank, and sludge concentration is 3.5g/L, and the residence time is 10h;
Step 4: one-level is aerobic, the PVA factory effluent through acidication process enters one-level aerobic reaction pond, and sludge concentration is 2.5g/L, and the residence time is 20h;
Step 5: secondary is aerobic, the PVA factory effluent through one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2.5g/L, and the residence time is 20h, water outlet after sedimentation.After testing, water outlet COD is 65mg/L, meets emission standard requirement.
Embodiment 4
The PVA factory effluent of certain enterprise, COD is 2500mg/L, pH is 5, and principal pollutant are PVA and acetic acid, adopts method treatment step of the present invention as follows:
Step 1: pre-treatment, adds sodium hydroxide in PVA factory effluent, by its pH regulator to 7;
Step 2: ozone oxidation, pretreated PVA factory effluent enters ozone reaction pond, passes into ozone, and in the ozone passed into and waste water, the mass ratio of COD is 1:2, and the reaction times is 3h, improves the biodegradability of PVA in waste water;
Step 3: acidication, the PVA factory effluent through ozone Oxidation Treatment enters acidication reaction tank, and sludge concentration is 3g/L, and the residence time is 8h;
Step 4: one-level is aerobic, the PVA factory effluent through acidication process enters one-level aerobic reaction pond, and sludge concentration is 2g/L, and the residence time is 25h;
Step 5: secondary is aerobic, the PVA factory effluent through one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2.5g/L, and the residence time is 18h, water outlet after sedimentation.After testing, water outlet COD is 68mg/L, meets emission standard requirement.
Embodiment 5
The PVA factory effluent of certain enterprise, COD is 2800mg/L, pH is 5, and principal pollutant are PVA and acetic acid, adopts method treatment step of the present invention as follows:
Step 1: pre-treatment, adds sodium hydroxide in PVA factory effluent, by its pH regulator to 7;
Step 2: ozone oxidation, pretreated PVA factory effluent enters ozone reaction pond, passes into ozone, and in the ozone passed into and waste water, the mass ratio of COD is 1:1, and the reaction times is 2h, improves the biodegradability of PVA in waste water;
Step 3: acidication, the PVA factory effluent through ozone Oxidation Treatment enters acidication reaction tank, and sludge concentration is 3.5g/L, and the residence time is 10h;
Step 4: one-level is aerobic, the PVA factory effluent through acidication process enters one-level aerobic reaction pond, and sludge concentration is 2.5g/L, and the residence time is 18h;
Step 5: secondary is aerobic, the PVA factory effluent through one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2.8g/L, and the residence time is 25h, water outlet after sedimentation.After testing, water outlet COD is 65mg/L, meets emission standard requirement.
Comparative example 1
The PVA factory effluent of certain enterprise, COD is 1500mg/L, pH is 4, and principal pollutant are PVA and acetic acid, and treatment step is as follows:
Step 1: pre-treatment, adds sodium hydroxide in PVA factory effluent, by its pH regulator to 6.5;
Step 2: acidication, enters acidication reaction tank through pretreated PVA factory effluent, and sludge concentration is 3g/L, and the residence time is 12h;
Step 3: one-level is aerobic, the PVA factory effluent through acidication process enters one-level aerobic reaction pond, and sludge concentration is 2g/L, and the residence time is 30h;
Step 4: secondary is aerobic, the PVA factory effluent through one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2g/L, and the residence time is 30h, water outlet after sedimentation.After testing, water outlet COD is 120mg/L.Compared with embodiment 1, without the PVA factory effluent of ozonize, aerobic through hydrolysis+secondary, water outlet COD is greater than 80mg/L, cannot realize qualified discharge.
Comparative example 2
The PVA factory effluent of certain enterprise, COD is 1500mg/L, pH is 4, and principal pollutant are PVA and acetic acid, and treatment step is as follows:
Step 1: pre-treatment, adds sodium hydroxide in PVA factory effluent, by its pH regulator to 6.5;
Step 2: ozone oxidation, pretreated PVA factory effluent enters ozone reaction pond, passes into ozone, and in the ozone passed into and waste water, the mass ratio of COD is 1:1, and the reaction times is 1h, improves the biodegradability of PVA in waste water;
Step 3: one-level is aerobic, the PVA factory effluent through ozone Oxidation Treatment enters one-level aerobic reaction pond, and sludge concentration is 2g/L, and the residence time is 30h;
Step 4: secondary is aerobic, the PVA factory effluent through one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2g/L, and the residence time is 30h, water outlet after sedimentation.After testing, water outlet COD is 132mg/L.Compared with embodiment 1, without the PVA factory effluent of hydrolysis, adopt ozone to add secondary aerobic, cannot qualified discharge be realized.
The content be not described in detail in this specification sheets belongs to the known prior art of professional and technical personnel in the field.
Claims (7)
1. a treatment process for PVA factory effluent, is characterized in that: utilize " ozone+acidication+secondary is aerobic " art breading PVA factory effluent, thus realize qualified discharge.
2. the treatment process of PVA factory effluent as claimed in claim 1, is characterized in that, comprise the steps:
Step 1: pre-treatment, adds alkali in PVA factory effluent, by its pH regulator to 6.5 ~ 7.5;
Step 2: ozone oxidation, pretreated PVA factory effluent enters ozone reaction pond, passes into ozone, and in the ozone passed into and waste water, the mass ratio of COD is 1:1 ~ 1:3, and the reaction times is 1 ~ 3h, improves the biodegradability of PVA in waste water;
Step 3: acidication, the PVA factory effluent through ozone Oxidation Treatment enters acidication reaction tank, and sludge concentration is 3 ~ 4g/L, and the residence time is 6 ~ 12h;
Step 4: one-level is aerobic, the PVA factory effluent through acidication process enters one-level aerobic reaction pond, and sludge concentration is 2 ~ 3g/L, and the residence time is 15 ~ 30h;
Step 5: secondary is aerobic, the PVA factory effluent through one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2 ~ 3g/L, and the residence time is 15 ~ 30h, water outlet after sedimentation.
3. the treatment process of PVA factory effluent as claimed in claim 2, is characterized in that: described PVA factory effluent COD is 1500mg/L ~ 3000mg/L, pH is 4 ~ 6, and pollutent comprises PVA and acetic acid.
4. the treatment process of PVA factory effluent as claimed in claim 2 or claim 3, is characterized in that: be preferably 8 ~ 10h through the residence time of PVA factory effluent in acidication reaction tank of ozone Oxidation Treatment.
5. the treatment process of PVA factory effluent as claimed in claim 2 or claim 3, is characterized in that: be preferably 18 ~ 25h through the residence time of PVA factory effluent in one-level aerobic reaction pond of acidication process.
6. the treatment process of PVA factory effluent as claimed in claim 2 or claim 3, is characterized in that: be preferably 18 ~ 25h through the residence time of PVA factory effluent in secondary aerobic reaction pond of one-level aerobic treatment.
7. the treatment process of PVA factory effluent as claimed in claim 2 or claim 3, is characterized in that: the effluent quality COD after process is less than 80mg/L, meets emission standard requirement.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776777A (en) * | 2016-05-16 | 2016-07-20 | 江苏省环境科学研究院 | Device and method for pre-treating PVA in printing and dyeing wastewater from desizing through enhanced biodegradation |
| CN114735894A (en) * | 2022-04-20 | 2022-07-12 | 河南君和环保科技有限公司 | Integrated treatment process for glassine production wastewater |
| CN114735894B (en) * | 2022-04-20 | 2024-05-31 | 河南君和环保科技有限公司 | Integrated treatment process for glassine paper production wastewater |
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| CN103342442A (en) * | 2013-07-18 | 2013-10-09 | 山东太平洋环保有限公司 | Integrated biotreatment system and method for PVC (poly vinyl chloride) industrial wastewater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103342442A (en) * | 2013-07-18 | 2013-10-09 | 山东太平洋环保有限公司 | Integrated biotreatment system and method for PVC (poly vinyl chloride) industrial wastewater |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776777A (en) * | 2016-05-16 | 2016-07-20 | 江苏省环境科学研究院 | Device and method for pre-treating PVA in printing and dyeing wastewater from desizing through enhanced biodegradation |
| CN105776777B (en) * | 2016-05-16 | 2018-08-24 | 江苏省环境科学研究院 | A kind of device and method of enhanced biodegradation pretreatment dye-printing desizing waste water PVA |
| CN114735894A (en) * | 2022-04-20 | 2022-07-12 | 河南君和环保科技有限公司 | Integrated treatment process for glassine production wastewater |
| CN114735894B (en) * | 2022-04-20 | 2024-05-31 | 河南君和环保科技有限公司 | Integrated treatment process for glassine paper production wastewater |
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