CN102381808B - Cyclic utilization method of epoxy resin washing waste water - Google Patents
Cyclic utilization method of epoxy resin washing waste water Download PDFInfo
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- CN102381808B CN102381808B CN2011102800169A CN201110280016A CN102381808B CN 102381808 B CN102381808 B CN 102381808B CN 2011102800169 A CN2011102800169 A CN 2011102800169A CN 201110280016 A CN201110280016 A CN 201110280016A CN 102381808 B CN102381808 B CN 102381808B
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- waste water
- water
- epoxy resin
- washing
- epoxy
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- 239000002351 wastewater Substances 0.000 title claims abstract description 148
- 239000003822 epoxy resin Substances 0.000 title claims abstract description 53
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 53
- 238000005406 washing Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 35
- 125000004122 cyclic group Chemical group 0.000 title abstract 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000008367 deionised water Substances 0.000 claims abstract description 27
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 27
- 238000010612 desalination reaction Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000002253 acid Substances 0.000 claims abstract description 8
- 230000018044 dehydration Effects 0.000 claims abstract description 8
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 8
- 239000004593 Epoxy Substances 0.000 claims description 25
- 229920005989 resin Polymers 0.000 claims description 25
- 239000011347 resin Substances 0.000 claims description 25
- VOOLKNUJNPZAHE-UHFFFAOYSA-N formaldehyde;2-methylphenol Chemical group O=C.CC1=CC=CC=C1O VOOLKNUJNPZAHE-UHFFFAOYSA-N 0.000 claims description 18
- 150000001447 alkali salts Chemical class 0.000 claims description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000010786 composite waste Substances 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 235000019600 saltiness Nutrition 0.000 claims description 8
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 238000002425 crystallisation Methods 0.000 claims description 5
- 230000008025 crystallization Effects 0.000 claims description 5
- 238000006386 neutralization reaction Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 abstract description 2
- 239000010812 mixed waste Substances 0.000 abstract 2
- 238000005119 centrifugation Methods 0.000 abstract 1
- 230000007935 neutral effect Effects 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 5
- 238000002203 pretreatment Methods 0.000 description 4
- 238000002242 deionisation method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- -1 pH is that 5 Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004900 laundering Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Landscapes
- Treatment Of Water By Ion Exchange (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention relates to the field of epoxy resin washing waste water post-treatment and discloses a cyclic utilization method of epoxy resin washing waste water. The cyclic utilization method of epoxy resin washing waste water comprises the following steps of 1, washing an epoxy resin by water to obtain waste water a, 2, washing the epoxy resin by alkaline water to obtain waste water b, 3, neutralizing the epoxy resin obtained by the step 2 by acid-containing deionized water to obtain neutral waste water c, repeatedly washing the neutralized epoxy resin by water to obtain waste water d, carrying out circulation dehydration to obtain waste water e, and mixing the waste water c, the waste water d and the waste water e into mixed waste water, 4, adjusting a pH value of the mixed waste water to a pH value of 7 to 10 to obtain low-salinity waste water, and adding the waste water b into the waste water a to obtain high-salinity waste water, 5, carrying out centrifugation of the low-salinity waste water to obtain clear liquid, and carrying out desalination biochemical treatment on the high-salinity waste water. The cyclic utilization method of epoxy resin washing waste water realizes waste water cyclic utilization, greatly reduces a use amount of deionized water used in epoxy resin washing, reduces a discharge amount of waste water produced in epoxy resin washing, greatly reduces pollution treatment costs, and has obvious advantages in fixed investment and cost treatment.
Description
Technical field
The present invention relates to epoxy resin washing waste water aftertreatment field, particularly a kind of circulation utilization method of epoxy resin washing waste water.
Background technology
Produce massive laundering waste water in the Resins, epoxy production process, this wastewater biodegradability is poor, adopts the pollution abatement costs of Fenton oxidation method processing waste water higher, has become the bottleneck of restriction the sector development.In order to produce high-quality epoxy resin, need a large amount of deionized waters that Resins, epoxy is washed, not only cause the waste of water resources, and the contaminated wastewater treatment cost that produces is higher, therefore many enterprises directly enter waste water environment and cause local environment to go from bad to worse.
Both at home and abroad, the various treatment processs of epoxy resin washing waste water and the problem of existence roughly have following several at present:
1, burning method: processing cost is higher, and equipment stops up easily;
2, dilution biochemical process: the extension rate that needs is larger, and infrastructure investment is large;
3, close circulation technology, multiple-effect evaporation technique and embrane method: waste water has been carried out classification processed, high salinity waste water evaporates desalination, and low concentration wastewater carries out the biochemical treatment qualified discharge after carrying out chemical oxidation pre-treatment first, but the cost of chemical oxidation is higher.
Disclosing a kind of high-salt epoxy resin production waste-water film integrated salt in the Chinese invention patent 200610051605.9 reclaims and biochemical processing method.High salinity waste water concentrates analyses salt, and cut is back to the de-salted water wash water.Low concentration wastewater enters the biochemical treatment qualified discharge after the Fenton oxidation pre-treatment.This method is carried out Fenton oxidation to low concentration wastewater, and processing cost is higher, and high salinity waste water cut water quality is general, can only be used for the de-salted water scouring water.
Many patents relevant with the epoxy resin washing waste water processing also all concentrate on high salinity waste water to main innovate point and process, constantly carry out technological improvement with the reduction processing cost, and not the report that reduces the processing cost aspect in the water washing process by the usage quantity that reduces deionized water.
Summary of the invention
In order to overcome the above problems, the invention provides a kind of circulation utilization method of epoxy resin washing waste water, advanced technology, technique is simple, and floor space is little, has not only reduced the usage quantity of deionized water, and greatly reduces pollution abatement costs.
The present invention is achieved in the following ways:
A kind of circulation utilization method of epoxy resin washing waste water may further comprise the steps:
(1) use washing water that the Resins, epoxy that reaction obtains is washed, obtain saltiness 10-23wt%, COD is the waste water a of 8000-20000mg/L;
(2) use the buck of 5-6wt% that Resins, epoxy is washed, obtain alkalinity 3-4wt%, COD is the waste water b of 7000-9000mg/L;
(3) with the Resins, epoxy after deionized water neutralization procedure (2) washing that contains acid to pH be during 4-6 obtains and waste water c, then wash Resins, epoxy at least twice with deionized water, the waste water that obtains is mixed to get waste water d, with deionized water the dehydration of Resins, epoxy circulation was got waste water e in 3-5 hour, waste water c, waste water d, waste water e are mixed, obtain composite waste;
(4) regulating composite waste pH is 7-10, obtains Low-salinity waste water, and waste water b and waste water a are mixed to get high alkali salt waste water;
(5) Low-salinity waste water is centrifugal through 2000-6000r/min, treatment capacity 1-5m
3/ h, the clear liquid of recovery gained;
(6) high alkali salt waste water evaporation desalination, the reuse of crystallization alkali salt, cut discharges after advancing biochemical treatment;
Described washing water is the clear liquid that deionized water or step (5) obtain.
Washing water is 1.4-1.6:1 with the weight ratio of reacting the Resins, epoxy that obtains in the step (1).
Alkali is sodium hydroxide in the used buck of step (2), and buck is 0.28-0.29:1 with the weight ratio of the Resins, epoxy that reaction obtains.
Step (3) obtain in and waste water c pH be 4-6.
The deionized water that contains acid in the step (3) is 0.4-0.45:1 with the weight ratio of reacting the Resins, epoxy that obtains, the used deionized water of each washing afterwards is 0.4-0.45:1 with the weight ratio of the Resins, epoxy that obtains of reaction, and the dewater weight ratio of the Resins, epoxy that used deionized water and reaction obtain of circulation is 0.2-0.25:1.
PH to 7-10 with waste water b adjusting composite waste in the step (4) obtains Low-salinity waste water, and remaining waste water b and waste water a are mixed to get high alkali salt waste water.
Step (3) composite waste COD is lower than 3000mg/L, and pH is 5-7.
Preferred described Resins, epoxy is o-cresol formaldehyde epoxy resin.
Beneficial effect of the present invention: by the control to the waste water saltiness, pH and the COD content that produce in the epoxy resin washing process, realize the recycle of waste water, greatly reduced the usage quantity of deionized water in the epoxy resin washing process, then reduced the quantity discharged of waste water in the epoxy resin washing process, greatly reduce pollution abatement costs, comparing, other adopt distillation effluent reuses to do de-salted water wash water, Low-salinity waste water through the technique of the laggard biochemical treatment qualified discharge of Fenton oxidation pre-treatment, and are with the obvious advantage on investment in fixed assets and processing cost.
Embodiment
Embodiment 1:
Adopt the circulation utilization method of epoxy resin washing waste water of the present invention, the 7t o-cresol formaldehyde epoxy resin that the Jinan, Shandong Province chemical plant produces processed, may further comprise the steps:
(1) use deionized water 11t that the 7t o-cresol formaldehyde epoxy resin is washed, obtain saltiness 22wt%, COD is the waste water a of 14602mg/L;
(2) use the buck 2t that contains sodium hydroxide 5wt% that o-cresol formaldehyde epoxy resin is washed, obtain alkalinity 3.5wt%, COD is the waste water b of 7354mg/L;
(3) with the o-cresol formaldehyde epoxy resin after deionized water 3t neutralization procedure (2) washing that contains acid to pH be 4, obtain pH and be 4 in and waste water c, then wash o-cresol formaldehyde epoxy resin twice with the 3t deionization successively, gained waste water is mixed to get waste water d, with the 1.5t deionized water dehydration of o-cresol formaldehyde epoxy resin circulation is got waste water e in 2 hours, waste water c, waste water d, waste water e are mixed, obtain composite waste, pH is that 5, COD is 1982mg/L;
(4) regulating composite waste pH with alkali is 7.5, obtains Low-salinity waste water, obtains high alkali salt waste water among the waste water b adding waste water a;
(5) Low-salinity waste water is centrifugal through 4000r/min, treatment capacity 5m
3/ h reclaims and obtains clear liquid 11t, as lower batch of epoxy resin washing water;
(6) high alkali salt waste water evaporation desalination, crystallization alkali salt reuse united alkali-making factory, cut advance qualified discharge after the biochemical treatment.
Embodiment 2:
Adopt the circulation utilization method of epoxy resin washing waste water of the present invention, the 7t o-cresol formaldehyde epoxy resin that the Jinan, Shandong Province chemical plant produces processed, may further comprise the steps:
(1) adopt the 11t clear liquid that step (5) obtains among the embodiment 1 to carry out the desalination washing, obtain saltiness 23wt%, COD is the waste water a of 15682mg/L;
(2) use the buck 2t that contains sodium hydroxide 5wt% that o-cresol formaldehyde epoxy resin is washed, obtain alkalinity 3.2wt%, COD is the waste water b of 8762mg/L;
(3) with the o-cresol formaldehyde epoxy resin after deionized water 3t neutralization procedure (2) washing that contains acid to pH be 5, obtain pH and be 5 in and waste water c, then wash o-cresol formaldehyde epoxy resin twice with the 3t deionization successively, gained waste water is mixed to get waste water d, with the 1.5t deionized water dehydration of o-cresol formaldehyde epoxy resin circulation is got waste water e in 2 hours, waste water c, waste water d, waste water e are mixed, obtain composite waste, pH is that 6.5, COD is 1539mg/L;
(4) part of the waste water b that step (2) is obtained adds in the composite waste, and regulating its pH is 8, obtains Low-salinity waste water, obtains high alkali salt waste water among the waste water a that remaining waste water b adding step (1) obtains;
(5) Low-salinity waste water is centrifugal through 3000r/min, treatment capacity 3m
3/ h reclaims and obtains clear liquid 11t, as lower batch of epoxy resin washing water;
(6) high alkali salt waste water evaporation desalination, crystallization alkali salt reuse united alkali-making factory, cut advance qualified discharge after the biochemical treatment.
Embodiment 3:
Adopt the circulation utilization method of epoxy resin washing waste water of the present invention, the 7t o-cresol formaldehyde epoxy resin that the Jinan, Shandong Province chemical plant produces processed, may further comprise the steps:
(1) adopt the 11t clear liquid that step (5) obtains among the embodiment 2 to carry out the desalination washing, obtain saltiness 23wt%, COD is the waste water a of 15809mg/L;
(2) use the buck 2t that contains sodium hydroxide 5wt% that o-cresol formaldehyde epoxy resin is washed, obtain alkalinity 3.3wt%, COD is the waste water b of 8351mg/L;
(3) with the o-cresol formaldehyde epoxy resin after deionized water 3t neutralization procedure (2) washing that contains acid to pH be 5.5, obtain pH and be 5.5 in and waste water c, then wash o-cresol formaldehyde epoxy resin twice with the 3t deionization successively, gained waste water is mixed to get waste water d, with the 1.5t deionized water dehydration of o-cresol formaldehyde epoxy resin circulation is got waste water e in 2 hours, waste water c, waste water d, waste water e are mixed, obtain composite waste, pH is that 6, COD is 1384mg/L;
(4) part of the waste water b that step (2) is obtained adds in the composite waste, and regulating its pH is 8.5, obtains Low-salinity waste water, obtains high alkali salt waste water among the waste water a that remaining waste water b adding step (1) obtains;
(5) Low-salinity waste water is centrifugal through 3500r/min, treatment capacity 4m
3/ h reclaims and obtains clear liquid 11t, as lower batch of epoxy resin washing water;
(6) high alkali salt waste water evaporation desalination, crystallization alkali salt reuse united alkali-making factory, cut advance qualified discharge after the biochemical treatment.
If epoxy resin washing waste water all discharging carries out Pollution abatement, not only cause the waste of effective water resources, and increased the Pollution abatement cost.The circulation utilization method of epoxy resin washing waste water of the present invention is by carrying out four washings, a neutralizing treatment, a circulation dehydration to Resins, epoxy; For the first time desalination of control washing waste water is saltiness 10%-23%wt, and COD is 8000-20000mg/L; Washing waste water is alkalinity 3%-4%wt for the second time, and COD is 7000-9000mg/L; Rear twice washing waste water, in and waste water and circulation dehydration waste water saltiness less, be slightly acidic, COD is lower than 3000mg/L; By the recycle to epoxy resin washing waste water, greatly reduced the usage quantity of deionized water in the epoxy resin washing process, then reduced the quantity discharged of waste water in the epoxy resin washing process, greatly reduce pollution abatement costs.Comparing, other adopt distillation effluent reuses to do de-salted water wash water, Low-salinity waste water through the technique of the laggard biochemical treatment qualified discharge of Fenton oxidation pre-treatment, and are with the obvious advantage on investment in fixed assets and processing cost.
Claims (8)
1. the circulation utilization method of an epoxy resin washing waste water is characterized in that may further comprise the steps:
(1) use washing water that the Resins, epoxy that reaction obtains is washed, obtain saltiness 10-23wt%, COD is the waste water a of 8000-20000mg/L;
(2) use the buck of 5-6wt% that Resins, epoxy is washed, obtain alkalinity 3-4wt%, COD is the waste water b of 7000-9000mg/L;
(3) with the Resins, epoxy after deionized water neutralization procedure (2) washing that contains acid to pH be during 4-6 obtains and waste water c, then wash Resins, epoxy at least twice with deionized water, the waste water that obtains is mixed to get waste water d, with deionized water the dehydration of Resins, epoxy circulation was got waste water e in 3-5 hour, waste water c, waste water d, waste water e are mixed, obtain composite waste;
(4) regulating composite waste pH is 7-10, obtains Low-salinity waste water, and waste water b and waste water a are mixed to get high alkali salt waste water;
(5) Low-salinity waste water is centrifugal through 2000-6000r/min, treatment capacity 1-5m
3/ h, the clear liquid of recovery gained;
(6) high alkali salt waste water evaporation desalination, the reuse of crystallization alkali salt, cut discharges after biochemical treatment;
Described washing water is the clear liquid that deionized water or step (5) obtain.
2. circulation utilization method according to claim 1 is characterized in that washing water is 1.4-1.6:1 with the weight ratio of reacting the Resins, epoxy that obtains in the step (1).
3. circulation utilization method according to claim 1 is characterized in that alkali is sodium hydroxide in the used buck of step (2), and buck is 0.28-0.29:1 with the weight ratio of the Resins, epoxy that reaction obtains.
4. circulation utilization method according to claim 1, it is characterized in that step (3) obtains in and waste water c pH be 4-6.
5. circulation utilization method according to claim 1, it is characterized in that the weight ratio that contains the deionized water of acid in the step (3) and react the Resins, epoxy that obtains is 0.4-0.45:1, the used deionized water of each washing afterwards is 0.4-0.45:1 with the weight ratio of the Resins, epoxy that obtains of reaction, and the dewater weight ratio of the Resins, epoxy that used deionized water and reaction obtain of circulation is 0.2-0.25:1.
6. circulation utilization method according to claim 1 is characterized in that the pH to 7-10 with waste water b adjusting composite waste obtains Low-salinity waste water in the step (4), and remaining waste water b and waste water a are mixed to get high alkali salt waste water.
7. circulation utilization method according to claim 1 is characterized in that step (3) composite waste COD is lower than 3000mg/L, and pH is 5-7.
8. circulation utilization method according to claim 1 is characterized in that described Resins, epoxy is o-cresol formaldehyde epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102800169A CN102381808B (en) | 2011-09-21 | 2011-09-21 | Cyclic utilization method of epoxy resin washing waste water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102800169A CN102381808B (en) | 2011-09-21 | 2011-09-21 | Cyclic utilization method of epoxy resin washing waste water |
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| CN102381808A CN102381808A (en) | 2012-03-21 |
| CN102381808B true CN102381808B (en) | 2013-05-29 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU6641498A (en) * | 1997-03-07 | 1998-09-22 | Akzo Nobel N.V. | Process for treating wastewater |
| CN100396617C (en) * | 2006-05-24 | 2008-06-25 | 浙江大学 | High-salt epoxy resin production waste-water film integrated salt recovery and biochemical treatment method |
| CN100567180C (en) * | 2007-07-24 | 2009-12-09 | 浙江大学 | The treatment process of the epoxy resin waste-water of high alkalinity, high salt, high organic content |
| CN102167422B (en) * | 2011-01-21 | 2012-08-08 | 南京工业大学 | A recovery process of industrial waste acid |
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