CN105347602B - A kind of biochemical processing method of PVA waste water - Google Patents
A kind of biochemical processing method of PVA waste water Download PDFInfo
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Abstract
The present invention relates to wastewater processing technologies, specifically a kind of biochemical processing method of PVA waste water, this method utilizes " sludge aeration absorption+hydrolysis acidification+two level is aerobic " process PVA waste water, the present invention adjusts the pH of PVA waste water by pretreatment first, then sludge aeration Adsorption part acetate and PVA are utilized, reduce impact to subsequent technique, hydrolysis acidification can effectively improve the biodegradability of PVA difficult to degrade in waste water, pass through the qualified discharge that the aerobic advanced treating of two level realizes PVA waste water.The present invention can realize PVA discharged wastewater met the national standard by group technology, while the technique also there is treatment effect to stablize, and safeguard simple, the smaller advantage of cost of investment.
Description
Technical field
The present invention relates to wastewater processing technology, specifically a kind of biochemical processing method of PVA waste water.Espespecially a kind of utilization
" sludge aeration absorption+hydrolysis acidification+two level is aerobic " process PVA waste water, so as to fulfill the qualified discharge technology of waste water.
Background technology
Chemical industry is the basic industry and pillar industry in China, and the industrial chemicals and product of production are widely used
In every field, occupied an important position in the national economy in China.Meanwhile chemical industry is also high pollution industry, it is produced
Waste water usually Recalcitrant chemicals containing high concentration, it is difficult to qualified discharge is reached by conventional waster water process processing, it is right
Surrounding enviroment are exerted heavy pressures on.
PVA (polyvinyl alcohol) waste water is the generated high-concentration hardly-degradable in PVA (polyvinyl alcohol) technical process is produced
Waste water, the waste water have the characteristics that water is big, organic concentration is high, bio-refractory, belong to intractable industrial wastewater.With south
For PVA waste water caused by the device in certain chemical plant, it is 1800~2800mg/L that the pH of waste water, which is 9 or so, COD, in waste water
The major pollutants contained are PVA and acetate, and wherein PVA biodegradabilities are poor, and content is 400mg/L or so, it is difficult to by general
Logical biochemical process obtains processing up to standard.
Sludge aeration absorption is a kind of wastewater preprocessing process, and sludge there is good absorption to make water pollutant
It is the discharge capacity that excess sludge is increased on the basis of Aerobic Process for Treatment with the absorption of, sludge aeration, while to sludge aeration adsorption tank
In add fresh sludge, remove the partial organic substances in waste water using the absorption of sludge and degradation, reduce the pollution of waste water
Object content reduces impact of the waste water to subsequent treatment process.As preconditioning technique, sludge aeration absorption has small investment, accounts for
The advantages that ground area is small, effect is good.
" hydrolysis acidification+aerobic " technique is a universal biochemistry combination process, is usually applied to printing and dyeing, papermaking, system
The industries such as medicine, chemical industry.Non-solubility organic matter in raw wastewater can be changed into dissolved organic matter by hydrolysis acidification, particularly
For wastewater from chemical industry, the organic matter of wherein difficult for biological degradation is mainly changed into the organic matter of easily biological-degradable, improves waste water
Biodegradability.Aerobic process is then acted on by the absorption degradation of microorganism, and the organic matter in waste water is converted into H2O and CO2Etc. nothings
Evil product, so as to fulfill the qualified discharge of waste water.
Patent " dissolved oxygen Optimum distribution denitrification process " (application number 201410008256) describes a kind of dissolved oxygen optimization
It is distributed denitrification process.Sewage is completed successively by hydrolysis acidification pool, level-one anoxic pond, oxidation pond, two level anoxic pond in the technique
The nitrification liquid that ammonification, nitrification and the denitrification process of sewage, wherein oxidation pond generate is back to level-one anoxic pond, two level anoxic pond
Water outlet using type external tubular membrane complete mud-water separation, the type external tubular membrane formed concentrate be back to hydrolysis acidification pool respectively
With two level anoxic pond.The technique enables to the efficiency of biological denitrificaion to improve, so as to there is apparent environmental benefit.
" research of hydrolysis acidification/SMBR processing desized wastewater containing PVA " (Liu Hao；Wang Jun；Xi Danli, Chinese water supply and drainage,
2007,23(21):A kind of utilization hydrolysis acidification+SMBR (integral type film biological reactor) methods 98-101) are reported for PVA works
The treatment effect of industry waste water.Compared with traditional sludge method, by the pretreatment of hydrolysis acidification, subsequent film biology can be significantly improved
The treatment effect of reactor, COD removal rates can reach 95%.However in the technique, water inlet there are certain requirements, in waste water
PVA easily results in blockage to film, and membrane reactor needs often cleaning, and the cost of membrane reactor and maintenance input also compare
Greatly.
Invention content
For defect in the prior art, the purpose of the present invention is to provide a kind of biochemical treatment sides of PVA waste water
Method, this method utilize " sludge aeration absorption+hydrolysis acidification+two level is aerobic " process PVA waste water, can be with by group technology
It realizes discharged wastewater met the national standard, while the technique also there is treatment effect to stablize, safeguards simple, the smaller advantage of cost of investment.
To achieve the above objectives, the technical solution adopted by the present invention is that：
A kind of biochemical processing method of PVA waste water, it is rapid including following steps：
Step 1：Pretreatment adds in acid into PVA waste water, its pH is adjusted to 6.5~7.5；
Step 2：Sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, using micropore gas explosion
Method maintains oxygen content in 3-5mg/L, and sludge concentration is 2~3g/L, and the residence time is 6~18h, reduces the organic matter of PVA waste water
Concentration；
Step 3：Hydrolysis acidification, the PVA waste water after sludge aeration adsorption treatment enter hydrolysis acidification reaction tank, sludge
A concentration of 4~5g/L, residence time are 6~14h；
Step 4：Level-one is aerobic, and by hydrolysis acidification, treated that PVA waste water enters level-one aerobic reaction tank, sludge concentration
For 2~3g/L, the residence time is 13~28h；
Step 5：Two level is aerobic, and the PVA waste water after level-one Aerobic Process for Treatment enters two level aerobic reaction tank, sludge concentration
For 1.5~2.5g/L, the residence time is 8~22h, is discharged after sedimentation.
On the basis of said program, COD a concentration of 1800mg/L~2800mg/L of the PVA waste water, pH for 8.5~
9.5, pollutant includes PVA and acetate.
On the basis of said program, by stop of the pretreated PVA waste water in the sludge aeration adsorption tank
Time is 8~16h.
On the basis of said program, the PVA waste water after sludge aeration adsorption treatment is reacted in the hydrolysis acidification
Residence time in pond is 8~12h.
On the basis of said program, by hydrolysis acidification treated PVA waste water in the level-one aerobic reaction tank
Residence time be 15~25h.
On the basis of said program, the PVA waste water after level-one Aerobic Process for Treatment is in the two level aerobic reaction tank
Residence time be 10~20h.
On the basis of said program, treated, and water outlet COD is less than 80mg/L, meets discharge standard requirement.
The biochemical processing method of PVA waste water of the present invention has the beneficial effect that：
1) during routine biochemistry process PVA waste water, PVA can generate White Flocculus after biochemical treatment, make sludge
Adhesion loses activity.And the present invention, using the suction-operated of sludge, discharges remaining in sludge aeration adsorption process in system
While sludge, White Flocculus is discharged, the PVA concentration of PVA waste water is reduced, reduces the impact to subsequent technique；
2) hydrolysis acidification can change the molecular structure of PVA in PVA waste water, improve its biodegradability, while can also remove
Part COD in PVA waste water, and further improve the biodegradability of sewage；
3) level-one is aerobic mainly passes through the acetate in the effect removal PVA waste water of microorganism and most PVA；
4) two level is aerobic can be further processed undegradable PVA in waste water, and advanced treating is carried out, and most to PVA waste water
Qualified discharge is realized eventually.
Description of the drawings
The present invention has drawings described below：
Fig. 1 is the process flow diagram of the biochemical processing method of the PVA waste water of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with attached drawing.
As shown in Figure 1, the biochemical processing method of PVA waste water of the present invention, adopts the technical scheme that：
A kind of processing method of PVA waste water, it is rapid including following steps：
Step 1：Pretreatment adds in acid into PVA waste water, its pH is adjusted to 6.5~7.5；
Step 2：Sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, using micropore gas explosion
Method maintains oxygen content in 3-5mg/L, and sludge concentration is 2~3g/L, and the residence time is 6~18h, reduces the organic matter of PVA waste water
Concentration reduces the impact to subsequent technique；
Step 3：Hydrolysis acidification, the PVA waste water after sludge aeration adsorption treatment enter hydrolysis acidification reaction tank, sludge
A concentration of 4~5g/L, residence time are 6~14h；
Step 4：Level-one is aerobic, and by hydrolysis acidification, treated that PVA waste water enters level-one aerobic reaction tank, sludge concentration
For 2~3g/L, the residence time is 13~28h；
Step 5：Two level is aerobic, and the PVA waste water after level-one Aerobic Process for Treatment enters two level aerobic reaction tank, sludge concentration
For 1.5~2.5g/L, the residence time is 8~22h, is discharged after sedimentation.
The present invention adjusts the pH of PVA waste water by pretreatment first, then utilizes sludge aeration Adsorption part acetic acid
Root and PVA, reduce the impact to subsequent technique, and hydrolysis acidification can effectively improve the biodegradability of PVA difficult to degrade in waste water, pass through
The aerobic advanced treating of two level realizes the qualified discharge of PVA waste water.
On the basis of said program, a large amount of acetate and PVA, the PVA are contained in PVA waste water of the present invention
The COD a concentration of 1800mg/L~2800mg/L, pH of waste water are 8.5~9.5, and major pollutants are PVA and acetate.Waste water
Feature 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 |
Based on the above technical solution, by pretreated PVA waste water in the sludge aeration adsorption tank
Residence time is preferably 8~16h.
Based on the above technical solution, the PVA waste water after sludge aeration adsorption treatment is in the hydrolysis acidification
Residence time in reaction tank is preferably 8~12h.
Based on the above technical solution, by hydrolysis acidification treated PVA waste water in the level-one aerobic reaction
Residence time in pond is preferably 15~25h.
Based on the above technical solution, the PVA waste water after level-one Aerobic Process for Treatment is in the two level aerobic reaction
Residence time in pond is preferably 10~20h.
The water outlet COD after process by the present invention is less than 80mg/L, meets discharge standard requirement.
The method have the advantages that adsorbing pretreatment PVA waste water using sludge aeration, most of organic matter, drop are removed
The low impact to subsequent technique after being handled by hydrolysis acidification, changes the molecular structure of PVA difficult to degrade, and improving it can give birth to
The property changed, makes water outlet reach discharge standard finally by the aerobic advanced treating of two level.Efficiently solve the row of wastewater from chemical industry difficult to degrade
Problem is put and administered, realizes the qualified discharge of waste water, protects environment, while there is apparent economic and social benefit.
It is specific embodiment below.
Embodiment 1
The PVA waste water of certain enterprise, COD 1800mg/L, pH 8.5, major pollutants are PVA and acetate.
Method processing step using the present invention is as follows：
Step 1：Pretreatment, hydrochloric acid is added in into PVA waste water, its pH is adjusted to 6.5；
Step 2：Sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, using micropore gas explosion
Method maintains most of organic matter of the oxygen content in 5mg/L, sludge concentration 2g/L, residence time 6h, removal PVA waste water；
Step 3：Hydrolysis acidification, the PVA waste water after sludge aeration adsorption treatment enter hydrolysis acidification reaction tank, sludge
A concentration of 4g/L, residence time 8h；
Step 4：Level-one is aerobic, and by hydrolysis acidification, treated that PVA waste water enters level-one aerobic reaction tank, sludge concentration
For 2g/L, residence time 13h；
Step 5：Two level is aerobic, and the PVA waste water after level-one Aerobic Process for Treatment enters two level aerobic reaction tank, sludge concentration
It is discharged after sedimentation for 1.5g/L, residence time 8h.After testing, water outlet COD is 72mg/L, meets discharge standard requirement.
Embodiment 2
The PVA waste water of certain enterprise, COD 2800mg/L, pH 9.5, major pollutants are PVA and acetate.
Method processing step using the present invention is as follows：
Step 1：Pretreatment, hydrochloric acid is added in into PVA waste water, its pH is adjusted to 7.5；
Step 2：Sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, using micropore gas explosion
Method maintains part of the oxygen content in 3mg/L, sludge concentration 3g/L, residence time 18h, degradation removal PVA waste water organic
Object；
Step 3：Hydrolysis acidification, the PVA waste water after sludge aeration adsorption treatment enter hydrolysis acidification reaction tank, sludge
A concentration of 5g/L, residence time 12h；
Step 4：Level-one is aerobic, and by hydrolysis acidification, treated that PVA waste water enters level-one aerobic reaction tank, sludge concentration
For 3g/L, residence time 15h；
Step 5：Two level is aerobic, and the PVA waste water after level-one Aerobic Process for Treatment enters two level aerobic reaction tank, sludge concentration
It is discharged after sedimentation for 2.5g/L, residence time 22h.Detection water outlet COD is 35mg/L, meets discharge standard requirement.
Embodiment 3
The PVA waste water of certain enterprise, COD 2200mg/L, pH 8.7, major pollutants are PVA and acetate.
Method processing step using the present invention is as follows：
Step 1：Pretreatment, hydrochloric acid is added in into PVA waste water, its pH is adjusted to 6.8；
Step 2：Sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, using micropore gas explosion
Method maintains organic matter of the oxygen content in 4mg/L, sludge concentration 2.3g/L, residence time 10h, reduction PVA waste water dense
Degree；
Step 3：Hydrolysis acidification, the PVA waste water after sludge aeration adsorption treatment enter hydrolysis acidification reaction tank, sludge
A concentration of 4.2g/L, residence time 10h；
Step 4：Level-one is aerobic, and through hydrolysis acidification, treated that PVA waste water enters level-one aerobic reaction tank, and sludge concentration is
2.5g/L, residence time 20h；
Step 5：Two level is aerobic, and the PVA waste water after level-one Aerobic Process for Treatment enters two level aerobic reaction tank, sludge concentration
It is discharged after sedimentation for 2g/L, residence time 15h.After testing, water outlet COD is 60mg/L, meets discharge standard requirement.
Embodiment 4
The PVA waste water of certain enterprise, COD 2000mg/L, pH 9.3, major pollutants are PVA and acetate.
Method processing step using the present invention is as follows：
Step 1：Pretreatment, hydrochloric acid is added in into PVA waste water, its pH is adjusted to 7.3；
Step 2：Sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, using micropore gas explosion
Method maintains organic matter of the oxygen content in 4.5mg/L, sludge concentration 2.3g/L, residence time 8h, removal part PVA waste water；
Step 3：Hydrolysis acidification, the PVA waste water after sludge aeration adsorption treatment enter hydrolysis acidification reaction tank, sludge
A concentration of 4.6g/L, residence time 14h；
Step 4：Level-one is aerobic, and by hydrolysis acidification, treated that PVA waste water enters level-one aerobic reaction tank, sludge concentration
For 2.3g/L, residence time 28h；
Step 5：Two level is aerobic, and the PVA waste water after level-one Aerobic Process for Treatment enters two level aerobic reaction tank, sludge concentration
It is discharged after sedimentation for 1.7g/L, residence time 10h.After testing, water outlet COD is 59mg/L, and meeting discharge standard will
It asks.
Embodiment 5
The PVA waste water of certain enterprise, COD 2250mg/L, pH 9.1, major pollutants are PVA and acetate.
Method processing step using the present invention is as follows：
Step 1：Pretreatment, hydrochloric acid is added in into PVA waste water, its pH is adjusted to 7.1；
Step 2：Sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, using micropore gas explosion
Method maintains oxygen content organic in 3.5mg/L, sludge concentration 2.7g/L, residence time 16h, part PVA waste water of degrading
Object；
Step 3：Hydrolysis acidification, the PVA waste water after sludge aeration adsorption treatment enter hydrolysis acidification reaction tank, sludge
A concentration of 4.8g/L, residence time 6h；
Step 4：Level-one is aerobic, and by hydrolysis acidification, treated that PVA waste water enters level-one aerobic reaction tank, sludge concentration
For 2.8g/L, residence time 25h；
Step 5：Two level is aerobic, and the PVA waste water after level-one Aerobic Process for Treatment enters two level aerobic reaction tank, sludge concentration
It is discharged after sedimentation for 2.3g/L, residence time 22h.After testing, water outlet COD is 45mg/L, and meeting discharge standard will
It asks.
Embodiment 6
The PVA waste water of certain enterprise, COD 2600mg/L, pH 8.8, major pollutants are PVA and acetate.
Method processing step using the present invention is as follows：
Step 1：Pretreatment, hydrochloric acid is added in into PVA waste water, its pH is adjusted to 7.2；
Step 2：Sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, using micropore gas explosion
Method maintains oxygen content organic in 3.8mg/L, sludge concentration 2.8g/L, residence time 15h, part PVA waste water of degrading
Object；
Step 3：Hydrolysis acidification, the PVA waste water after sludge aeration adsorption treatment enter hydrolysis acidification reaction tank, sludge
A concentration of 4.2g/L, residence time 9h；
Step 4：Level-one is aerobic, and by hydrolysis acidification, treated that PVA waste water enters level-one aerobic reaction tank, sludge concentration
For 2.7g/L, residence time 20h；
Step 5：Two level is aerobic, and the PVA waste water after level-one Aerobic Process for Treatment enters two level aerobic reaction tank, sludge concentration
It is discharged after sedimentation for 2.1g/L, residence time 20h.After testing, water outlet COD is 60mg/L, and meeting discharge standard will
It asks.
Comparative example 1
The PVA waste water of certain enterprise, COD 1800mg/L, pH 8.5, major pollutants are PVA and acetate, and processing walks
It is rapid as follows：
Step 1：Pretreatment, hydrochloric acid is added in into PVA waste water, its pH is adjusted to 6.5；
Step 2：Hydrolysis acidification, the PVA waste water by pretreatment enter hydrolysis acidification reaction tank, sludge concentration 4g/L,
Residence time is 8h；
Step 3：Level-one is aerobic, and by hydrolysis acidification, treated that PVA waste water enters level-one aerobic reaction tank, sludge concentration
For 2g/L, residence time 13h；
Step 4：Two level is aerobic, and the PVA waste water after level-one Aerobic Process for Treatment enters two level aerobic reaction tank, sludge concentration
It is discharged after sedimentation for 1.5g/L, residence time 8h.After testing, water outlet COD is 160mg/L.Compared with Example 1, not
By the PVA waste water of sludge aeration absorption pretreatment, it is aerobic to only pass through hydrolysis+two level, and water outlet COD is exceeded, can not realize and reach
Mark discharge.
Comparative example 2
The PVA waste water of certain enterprise, COD 2200mg/L, pH 8.7, major pollutants are PVA and acetate, and processing walks
It is rapid as follows：
Step 1：Pretreatment, hydrochloric acid is added in into PVA waste water, its pH is adjusted to 6.8；
Step 2：Sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, using micropore gas explosion
Method maintains oxygen content in 4mg/L, sludge concentration 2.3g/L, residence time 10h, and removal PVA gives up water part organic matter；
Step 3：Level-one is aerobic, and the PVA waste water after sludge aeration adsorption treatment enters level-one aerobic reaction tank, sludge
A concentration of 2.5g/L, residence time 20h；
Step 4：Two level is aerobic, and by level-one aerobic tank, treated that PVA waste water enters two level aerobic reaction tank, and sludge is dense
It spends and is discharged after sedimentation for 2g/L, residence time 15h.After testing, water outlet COD is 168mg/L.Compared with Example 3,
Without the PVA waste water of hydrolysis, adsorbed using sludge aeration+two level is aerobic, water outlet COD is more than 80mg/L, can not realize up to standard
Discharge.
The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (4)
1. a kind of biochemical processing method of PVA waste water, it is characterised in that：It is rapid including following steps：
Step 1：Pretreatment adds in acid into PVA waste water, its pH is adjusted to 6.5~7.5；
Step 2：Sludge aeration adsorbs, and pretreated PVA waste water enters sludge aeration adsorption tank, using micro-pore aeration method, dimension
Oxygen content is held in 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：Hydrolysis acidification, the PVA waste water after sludge aeration adsorption treatment enter hydrolysis acidification reaction tank, sludge concentration
For 4~5g/L, the residence time is 8~12h；
Step 4：Level-one is aerobic, and by hydrolysis acidification, treated that PVA waste water enters level-one aerobic reaction tank, sludge concentration 2
~3g/L, residence time are 13~28h；
Step 5：Two level is aerobic, and the PVA waste water after level-one Aerobic Process for Treatment enters two level aerobic reaction tank, and sludge concentration is
1.5~2.5g/L, residence time are 8~22h, are discharged after sedimentation；
The COD a concentration of 1800mg/L~2800mg/L, pH of the PVA waste water are 8.5~9.5, and pollutant includes PVA and acetic acid
Root；
The PVA waste water by the step 1-5 treated water outlet COD be less than 80mg/L, meet discharge standard requirement.
2. the biochemical processing method of PVA waste water as described in claim 1, it is characterised in that：By pretreated PVA waste water
Residence time in the sludge aeration adsorption tank is 8~16h.
3. the biochemical processing method of PVA waste water as described in claim 1, it is characterised in that：By hydrolysis acidification, treated
Residence time of the PVA waste water in the level-one aerobic reaction tank is 15~25h.
4. the biochemical processing method of PVA waste water as described in claim 1, it is characterised in that：After level-one Aerobic Process for Treatment
Residence time of the PVA waste water in the two level aerobic reaction tank is 10~20h.
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| 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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| 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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| 聚乙烯醇+淀粉模拟退浆废水的小试处理研究;王志刚等;《西安工程大学学报》;20130630;第27卷(第3期);第355页第3-4段，表1、图1 * |
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