CN105347602A - PVA wastewater biological treatment method - Google Patents
PVA wastewater biological treatment method Download PDFInfo
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- CN105347602A CN105347602A CN201410408741.3A CN201410408741A CN105347602A CN 105347602 A CN105347602 A CN 105347602A CN 201410408741 A CN201410408741 A CN 201410408741A CN 105347602 A CN105347602 A CN 105347602A
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Abstract
The present invention relates to a wastewater treatment technology, specifically to a PVA wastewater biological treatment method, wherein a process comprising sludge aeration adsorption, hydrolysis acidification and two-stage aerobic treatment is used to treat the PVA wastewater. According to the present invention, the pH value of PVA wastewater is adjusted through pretreatment, sludge aeration adsorption is used to remove partial acetates and PVA so as to reduce the impact on the subsequent process, hydrolysis acidification is used to effectively improve the biodegradability of the difficultly-degraded PVA in the wastewater, and the standard emission of the PVA wastewater is achieved through the two-stage aerobic deep treatment; with the combination process, the standard emission of the PVA wastewater is achieved; and the process further has advantages of stable treatment effect, easy maintenance, and low investment cost.
Description
Technical field
The present invention relates to wastewater processing technology, is a kind of biochemical processing method of PVA waste water specifically.Espespecially a kind of utilization " sludge aeration absorption+acidication+secondary is aerobic " art breading PVA waste water, thus realize the qualified discharge technology of waste water.
Background technology
Chemical industry is basic industry and the mainstay industry of China, and industrial chemicals and the product of production are widely used in every field, in the national economy of China, occupy critical role.Meanwhile, chemical industry is also high pollution industry, and the Recalcitrant chemicals of the waste water produced usually containing high density, is difficult to reach qualified discharge by the waster water process process of routine, exerts heavy pressures on to surrounding enviroment.
PVA (polyvinyl alcohol) waste water is producing the high-concentration hardly-degradable waste water produced in PVA (polyvinyl alcohol) technological process, this waste water has the features such as the water yield is large, organic concentration is high, bio-refractory, belongs to unmanageable trade effluent.For the PVA waste water that the device in certain chemical plant, south produces, the pH of waste water is about 9, COD is 1800 ~ 2800mg/L, the principal pollutant contained in waste water are PVA and acetate, wherein PVA biodegradability is poor, content is about 400mg/L, is difficult to obtain process up to standard by ordinary student metallization processes.
Sludge aeration absorption is a kind of wastewater preprocessing process, mud has good adsorption for water pollutant, sludge aeration absorption is on the basis of aerobic treatment, strengthen the quantity discharged of excess sludge, in sludge aeration adsorption tank, add fresh sludge simultaneously, utilize the partial organic substances in the absorption of mud and Degradation removing waste water, reduce the pollutant load of waste water, reduce waste water to the impact of subsequent treatment process.As preconditioning technique, sludge aeration absorption has the advantages such as less investment, floor space are little, effective.
" acidication+aerobic " technique is a general biochemistry combination process, is usually applied to the industries such as printing and dyeing, papermaking, pharmacy, chemical industry.Acidication can change the non-solubility organism in raw wastewater into dissolved organic matter, particularly for wastewater from chemical industry, mainly the organism of wherein difficult for biological degradation is changed into the organism of readily biodegradable, improves the biodegradability of waste water.Organism in waste water then by the absorption degradation effect of microorganism, is converted into H by aerobic process
2o and CO
2deng harmless products, thus realize the qualified discharge of waste water.
Patent " dissolved oxygen Optimum distribution denitrification process " (application number 201410008256) describes a kind of dissolved oxygen Optimum distribution denitrification process.In this technique, sewage is successively through hydrolysis acidification pool, one-level anoxic pond, oxidation pond, secondary anoxic pond, complete the ammonification of sewage, nitrated and denitrification process, the nitrification liquid that wherein oxidation pond produces is back to one-level anoxic pond, the water outlet of secondary anoxic pond adopts type external tubular membrane to complete mud-water separation, and the concentrated solution that this type external tubular membrane is formed is back to hydrolysis acidification pool and secondary anoxic pond respectively.This technique can make the efficiency of biological denitrificaion improve, thus has obvious environmental benefit.
" acidication/SMBR process is containing the research of PVA desized wastewater " (Liu Hao; Wang Jun; Xi Danli, Chinese water supply and drainage, 2007,23 (21): 98-101) report one and utilize acidication+SMBR (integral type film biological reactor) method for the treatment effect of PVA trade effluent.Compared with traditional sludge method, through the pre-treatment of acidication, can significantly improve the treatment effect of subsequent film bio-reactor, COD clearance can reach 95%.But in this technique, water inlet be there are certain requirements, the PVA in waste water easily results in blockage to film, and membrane reactor needs often cleaning, and the cost of membrane reactor drops into also larger with maintenance.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind of biochemical processing method of PVA waste water, present method utilizes " sludge aeration absorption+acidication+secondary is aerobic " art breading PVA waste water, discharged wastewater met the national standard can be realized through combination process, simultaneously this technique also have treatment effect stablize, safeguard simple, the advantage that cost of investment is less.
For reaching above object, the technical scheme that the present invention takes is:
A biochemical processing method for PVA waste water, comprises following each step:
Step 1: pre-treatment, adds acid in PVA waste water, by its pH regulator to 6.5 ~ 7.5;
Step 2: sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, adopts micropore aerate method, and maintain oxygen level at 3-5mg/L, sludge concentration is 2 ~ 3g/L, and the residence time is 6 ~ 18h, reduces the organic concentration of PVA waste water;
Step 3: acidication, the PVA waste water after sludge aeration adsorption treatment enters acidication reaction tank, and sludge concentration is 4 ~ 5g/L, and the residence time is 6 ~ 14h;
Step 4: one-level is aerobic, the PVA waste water after acidication process enters one-level aerobic reaction pond, and sludge concentration is 2 ~ 3g/L, and the residence time is 13 ~ 28h;
Step 5: secondary is aerobic, the PVA waste water after one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 1.5 ~ 2.5g/L, and the residence time is 8 ~ 22h, water outlet after sedimentation.
On the basis of such scheme, the COD concentration of described PVA waste water is 1800mg/L ~ 2800mg/L, pH is 8.5 ~ 9.5, and pollutent comprises PVA and acetate.
On the basis of such scheme, be 8 ~ 16h through the residence time of pretreated PVA waste water in described sludge aeration adsorption tank.
On the basis of such scheme, the residence time of the PVA waste water after sludge aeration adsorption treatment in described acidication reaction tank is 8 ~ 12h.
On the basis of such scheme, the residence time of the PVA waste water after acidication process in described one-level aerobic reaction pond is 15 ~ 25h.
On the basis of such scheme, the residence time of the PVA waste water after one-level aerobic treatment in described secondary aerobic reaction pond is 10 ~ 20h.
On the basis of such scheme, the water outlet COD after process is less than 80mg/L, meets emission standard requirement.
The beneficial effect of the biochemical processing method of PVA waste water of the present invention is:
1) during routine biochemistry art breading PVA waste water, PVA can produce White Flocculus after biochemical treatment, makes mud adhesion, loses activity.And the present invention is in sludge aeration adsorption process, utilize the adsorption of mud, while system discharges excess sludge, White Flocculus is discharged, reduce the PVA concentration of PVA waste water, reduce the impact to subsequent technique;
2) acidication can change the molecular structure of PVA in PVA waste water, improves its biodegradability, can also remove the part COD in PVA waste water simultaneously, and improves the biodegradability of sewage further;
3) acetate in the one-level aerobic removal of the effect mainly through microorganism PVA waste water and most PVA;
4) secondary is aerobic can process undegradable PVA in waste water further, carries out advanced treatment, and finally realize qualified discharge to PVA waste water.
Accompanying drawing explanation
The present invention has following accompanying drawing:
Fig. 1 is the process flow diagram of the biochemical processing method of PVA waste water 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 biochemical processing method of PVA waste water of the present invention, the technical scheme taked is:
A treatment process for PVA waste water, comprises following each step:
Step 1: pre-treatment, adds acid in PVA waste water, by its pH regulator to 6.5 ~ 7.5;
Step 2: sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, adopts micropore aerate method, maintain oxygen level at 3-5mg/L, sludge concentration is 2 ~ 3g/L, and the residence time is 6 ~ 18h, reduce the organic concentration of PVA waste water, reduce the impact to subsequent technique;
Step 3: acidication, the PVA waste water after sludge aeration adsorption treatment enters acidication reaction tank, and sludge concentration is 4 ~ 5g/L, and the residence time is 6 ~ 14h;
Step 4: one-level is aerobic, the PVA waste water after acidication process enters one-level aerobic reaction pond, and sludge concentration is 2 ~ 3g/L, and the residence time is 13 ~ 28h;
Step 5: secondary is aerobic, the PVA waste water after one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 1.5 ~ 2.5g/L, and the residence time is 8 ~ 22h, water outlet after sedimentation.
First the present invention regulates the pH of PVA waste water by pre-treatment, then sludge aeration Adsorption part acetate and PVA is utilized, reduce the impact to subsequent technique, acidication effectively can improve the biodegradability of difficult degradation PVA in waste water, is realized the qualified discharge of PVA waste water by the aerobic advanced treatment of secondary.
On the basis of such scheme, containing a large amount of acetates and PVA in PVA waste water of the present invention, the COD concentration of described PVA waste water is 1800mg/L ~ 2800mg/L, pH is 8.5 ~ 9.5, and principal pollutant are PVA and acetate.The feature of waste water is as shown in the table:
| Wastewater source | PVA waste water |
| pH | 8.5～9.5 |
| COD(mg/L) | 1800-2800 |
| Main pollutant component | Acetate, PVA |
On the basis of technique scheme, be preferably 8 ~ 16h through the residence time of pretreated PVA waste water in described sludge aeration adsorption tank.
On the basis of technique scheme, the residence time of the PVA waste water after sludge aeration adsorption treatment in described acidication reaction tank is preferably 8 ~ 12h.
On the basis of technique scheme, the residence time of the PVA waste water after acidication process in described one-level aerobic reaction pond is preferably 15 ~ 25h.
On the basis of technique scheme, the residence time of the PVA waste water after one-level aerobic treatment in described secondary aerobic reaction pond is preferably 10 ~ 20h.
Water outlet COD after art breading of the present invention is less than 80mg/L, meets emission standard requirement.
The advantage of the inventive method is to utilize sludge aeration to adsorb pre-treatment PVA waste water, remove most of organism, reduce the impact to subsequent technique, after acidication process, change the molecular structure of difficult degradation PVA, improve its biodegradability, make water outlet reach emission standard finally by the aerobic advanced treatment of secondary.Efficiently solve the discharge of difficult degradation wastewater from chemical industry and administer a difficult problem, realizing the qualified discharge of waste water, protect environment, there is obvious economic and social benefit simultaneously.
It is below specific embodiment.
Embodiment 1
The PVA waste water of certain enterprise, COD is 1800mg/L, pH is 8.5, and principal pollutant are PVA and acetate.
Adopt method treatment step of the present invention as follows:
Step 1: pre-treatment, adds hydrochloric acid in PVA waste water, by its pH regulator to 6.5;
Step 2: sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, adopts micropore aerate method, and maintain oxygen level at 5mg/L, sludge concentration is 2g/L, and the residence time is 6h, removes the most of organism in PVA waste water;
Step 3: acidication, the PVA waste water after sludge aeration adsorption treatment enters acidication reaction tank, and sludge concentration is 4g/L, and the residence time is 8h;
Step 4: one-level is aerobic, the PVA waste water after acidication process enters one-level aerobic reaction pond, and sludge concentration is 2g/L, and the residence time is 13h;
Step 5: secondary is aerobic, the PVA waste water after one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 1.5g/L, and the residence time is 8h, water outlet after sedimentation.After testing, water outlet COD is 72mg/L, meets emission standard requirement.
Embodiment 2
The PVA waste water of certain enterprise, COD is 2800mg/L, pH is 9.5, and principal pollutant are PVA and acetate.
Adopt method treatment step of the present invention as follows:
Step 1: pre-treatment, adds hydrochloric acid in PVA waste water, by its pH regulator to 7.5;
Step 2: sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, adopts micropore aerate method, and maintain oxygen level at 3mg/L, sludge concentration is 3g/L, and the residence time is 18h, and the partial organic substances in PVA waste water is removed in degraded;
Step 3: acidication, the PVA waste water after sludge aeration adsorption treatment enters acidication reaction tank, and sludge concentration is 5g/L, and the residence time is 12h;
Step 4: one-level is aerobic, the PVA waste water after 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 waste water after one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2.5g/L, and the residence time is 22h, water outlet after sedimentation.Detecting water outlet COD is 35mg/L, meets emission standard requirement.
Embodiment 3
The PVA waste water of certain enterprise, COD is 2200mg/L, pH is 8.7, and principal pollutant are PVA and acetate.
Adopt method treatment step of the present invention as follows:
Step 1: pre-treatment, adds hydrochloric acid in PVA waste water, by its pH regulator to 6.8;
Step 2: sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, adopts micropore aerate method, and maintain oxygen level at 4mg/L, sludge concentration is 2.3g/L, and the residence time is 10h, reduces the organic concentration in PVA waste water;
Step 3: acidication, the PVA waste water after sludge aeration adsorption treatment enters acidication reaction tank, and sludge concentration is 4.2g/L, and the residence time is 10h;
Step 4: one-level is aerobic, the PVA waste water after 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 waste water after one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2g/L, and the residence time is 15h, water outlet after sedimentation.After testing, water outlet COD is 60mg/L, meets emission standard requirement.
Embodiment 4
The PVA waste water of certain enterprise, COD is 2000mg/L, pH is 9.3, and principal pollutant are PVA and acetate.
Adopt method treatment step of the present invention as follows:
Step 1: pre-treatment, adds hydrochloric acid in PVA waste water, by its pH regulator to 7.3;
Step 2: sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, adopts micropore aerate method, and maintain oxygen level at 4.5mg/L, sludge concentration 2.3g/L, the residence time is 8h, removes the organism in part PVA waste water;
Step 3: acidication, the PVA waste water after sludge aeration adsorption treatment enters acidication reaction tank, and sludge concentration is 4.6g/L, and the residence time is 14h;
Step 4: one-level is aerobic, the PVA waste water after acidication process enters one-level aerobic reaction pond, and sludge concentration is 2.3g/L, and the residence time is 28h;
Step 5: secondary is aerobic, the PVA waste water after one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 1.7g/L, and the residence time is 10h, water outlet after sedimentation.After testing, water outlet COD is 59mg/L, meets emission standard requirement.
Embodiment 5
The PVA waste water of certain enterprise, COD is 2250mg/L, pH is 9.1, and principal pollutant are PVA and acetate.
Adopt method treatment step of the present invention as follows:
Step 1: pre-treatment, adds hydrochloric acid in PVA waste water, by its pH regulator to 7.1;
Step 2: sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, adopts micropore aerate method, and maintain oxygen level at 3.5mg/L, sludge concentration 2.7g/L, the residence time is 16h, the organism in degraded part PVA waste water;
Step 3: acidication, the PVA waste water after sludge aeration adsorption treatment enters acidication reaction tank, and sludge concentration is 4.8g/L, and the residence time is 6h;
Step 4: one-level is aerobic, the PVA waste water after acidication process enters one-level aerobic reaction pond, and sludge concentration is 2.8g/L, and the residence time is 25h;
Step 5: secondary is aerobic, the PVA waste water after one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2.3g/L, and the residence time is 22h, water outlet after sedimentation.After testing, water outlet COD is 45mg/L, meets emission standard requirement.
Embodiment 6
The PVA waste water of certain enterprise, COD is 2600mg/L, pH is 8.8, and principal pollutant are PVA and acetate.
Adopt method treatment step of the present invention as follows:
Step 1: pre-treatment, adds hydrochloric acid in PVA waste water, by its pH regulator to 7.2;
Step 2: sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, adopts micropore aerate method, and maintain oxygen level at 3.8mg/L, sludge concentration 2.8g/L, the residence time is 15h, the organism in degraded part PVA waste water;
Step 3: acidication, the PVA waste water after sludge aeration adsorption treatment enters acidication reaction tank, and sludge concentration is 4.2g/L, and the residence time is 9h;
Step 4: one-level is aerobic, the PVA waste water after acidication process enters one-level aerobic reaction pond, and sludge concentration is 2.7g/L, and the residence time is 20h;
Step 5: secondary is aerobic, the PVA waste water after one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 2.1g/L, and the residence time is 20h, water outlet after sedimentation.After testing, water outlet COD is 60mg/L, meets emission standard requirement.
Comparative example 1
The PVA waste water of certain enterprise, COD is 1800mg/L, pH is 8.5, and principal pollutant are PVA and acetate, and treatment step is as follows:
Step 1: pre-treatment, adds hydrochloric acid in PVA waste water, by its pH regulator to 6.5;
Step 2: acidication, enters acidication reaction tank through pretreated PVA waste water, and sludge concentration is 4g/L, and the residence time is 8h;
Step 3: one-level is aerobic, the PVA waste water after acidication process enters one-level aerobic reaction pond, and sludge concentration is 2g/L, and the residence time is 13h;
Step 4: secondary is aerobic, the PVA waste water after one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 1.5g/L, and the residence time is 8h, water outlet after sedimentation.After testing, water outlet COD is 160mg/L.Compared with embodiment 1, adsorb pretreated PVA waste water without sludge aeration, only pass through hydrolysis+secondary aerobic, water outlet COD exceeds standard, and cannot realize qualified discharge.
Comparative example 2
The PVA waste water of certain enterprise, COD is 2200mg/L, pH is 8.7, and principal pollutant are PVA and acetate, and treatment step is as follows:
Step 1: pre-treatment, adds hydrochloric acid in PVA waste water, by its pH regulator to 6.8;
Step 2: sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, adopts micropore aerate method, and maintain oxygen level at 4mg/L, sludge concentration is 2.3g/L, and the residence time is 10h, removes partial organic substances in PVA waste water;
Step 3: one-level is aerobic, the PVA waste water after sludge aeration adsorption treatment enters one-level aerobic reaction pond, and sludge concentration is 2.5g/L, and the residence time is 20h;
Step 4: secondary is aerobic, the PVA waste water after the process of one-level Aerobic Pond enters secondary aerobic reaction pond, and sludge concentration is 2g/L, and the residence time is 15h, water outlet after sedimentation.After testing, water outlet COD is 168mg/L.Compared with embodiment 3, without the PVA waste water of hydrolysis, adopt sludge aeration absorption+secondary aerobic, water outlet COD is greater than 80mg/L, cannot realize qualified discharge.
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 biochemical processing method for PVA waste water, is characterized in that: comprise following each step:
Step 1: pre-treatment, adds acid in PVA waste water, by its pH regulator to 6.5 ~ 7.5;
Step 2: sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, adopts micropore aerate method, and maintain oxygen level at 3-5mg/L, sludge concentration is 2 ~ 3g/L, and the residence time is 6 ~ 18h, reduces the organic concentration of PVA waste water;
Step 3: acidication, the PVA waste water after sludge aeration adsorption treatment enters acidication reaction tank, and sludge concentration is 4 ~ 5g/L, and the residence time is 6 ~ 14h;
Step 4: one-level is aerobic, the PVA waste water after acidication process enters one-level aerobic reaction pond, and sludge concentration is 2 ~ 3g/L, and the residence time is 13 ~ 28h;
Step 5: secondary is aerobic, the PVA waste water after one-level aerobic treatment enters secondary aerobic reaction pond, and sludge concentration is 1.5 ~ 2.5g/L, and the residence time is 8 ~ 22h, water outlet after sedimentation.
2. the biochemical processing method of PVA waste water as claimed in claim 1, is characterized in that: the COD concentration of described PVA waste water is 1800mg/L ~ 2800mg/L, pH is 8.5 ~ 9.5, and pollutent comprises PVA and acetate.
3. the biochemical processing method of PVA waste water as claimed in claim 1 or 2, is characterized in that: be 8 ~ 16h through the residence time of pretreated PVA waste water in described sludge aeration adsorption tank.
4. the biochemical processing method of PVA waste water as claimed in claim 1 or 2, is characterized in that: the residence time of the PVA waste water after sludge aeration adsorption treatment in described acidication reaction tank is 8 ~ 12h.
5. the biochemical processing method of PVA waste water as claimed in claim 1 or 2, is characterized in that: the residence time of the PVA waste water after acidication process in described one-level aerobic reaction pond is 15 ~ 25h.
6. the biochemical processing method of PVA waste water as claimed in claim 1 or 2, is characterized in that: the residence time of the PVA waste water after one-level aerobic treatment in described secondary aerobic reaction pond is 10 ~ 20h.
7. the biochemical processing method of PVA waste water as claimed in claim 1 or 2, is characterized in that: the water outlet COD after process is less than 80mg/L, meets emission standard requirement.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106875995A (en) * | 2017-01-20 | 2017-06-20 | 魏家奎 | A kind of method for purifying the degradable PVA products of low-activity in disposal |
| CN108840479A (en) * | 2018-07-15 | 2018-11-20 | 杭州火蓝刀锋科技咨询有限公司 | A kind of printing and dyeing PVA pretreatment method for wastewater |
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| CN102040313A (en) * | 2010-09-27 | 2011-05-04 | 常熟市福亿印花炼染有限公司 | Process for treating high-concentration printing and dying waste water |
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| 王志刚等: "聚乙烯醇+淀粉模拟退浆废水的小试处理研究", 《西安工程大学学报》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106875995A (en) * | 2017-01-20 | 2017-06-20 | 魏家奎 | A kind of method for purifying the degradable PVA products of low-activity in disposal |
| CN108840479A (en) * | 2018-07-15 | 2018-11-20 | 杭州火蓝刀锋科技咨询有限公司 | A kind of printing and dyeing PVA pretreatment method for wastewater |
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