CN104250054B - A kind of leather-making waste water diversion processing method - Google Patents
A kind of leather-making waste water diversion processing method Download PDFInfo
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- CN104250054B CN104250054B CN201310265376.0A CN201310265376A CN104250054B CN 104250054 B CN104250054 B CN 104250054B CN 201310265376 A CN201310265376 A CN 201310265376A CN 104250054 B CN104250054 B CN 104250054B
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- China
- Prior art keywords
- leather
- waste water
- making waste
- making
- dextran
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- 239000002351 wastewater Substances 0.000 title claims abstract description 56
- 238000003672 processing method Methods 0.000 title claims abstract description 14
- 239000002699 waste material Substances 0.000 claims abstract description 40
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 30
- 229920002307 Dextran Polymers 0.000 claims abstract description 29
- 239000011651 chromium Substances 0.000 claims abstract description 27
- 238000000605 extraction Methods 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 23
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 19
- 238000001556 precipitation Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000010792 warming Methods 0.000 claims abstract description 6
- 229910000278 bentonite Inorganic materials 0.000 claims description 10
- 239000000440 bentonite Substances 0.000 claims description 10
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 10
- 229920002401 polyacrylamide Polymers 0.000 claims description 8
- 238000004065 wastewater treatment Methods 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 3
- 230000009229 glucose formation Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000010985 leather Substances 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000003311 flocculating effect Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
The present invention relates to a kind of method of wastewater treatment, especially relate to a kind of leather-making waste water diversion processing method, described treatment process is carried out in the steps below: containing after chromium, the leather-making waste water of ammonia nitrogen and the water of productive use of other operation are shunted of each operation is collected to settling tank by (1); (2) in settling tank, add during alkalinity extraction dextran is produced pH to 8.0 ~ 10.0 of waste liquid or the waste residue adjustment leather-making waste water produced, be then warming up to 30 ~ 45 DEG C, reaction 5 ~ 8h, be then separated and remove precipitation; (3) leather-making waste water removed after precipitation is passed through the process of SBR equalizing tank again.Utilize the waste liquid after alkalinity extraction dextran or waste residue to process leather-making waste water, waste recycling, has treatment facility less investment, the advantages such as treatment process is reasonable, processing efficiency is high, processing cost is low.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, especially relate to a kind of leather-making waste water diversion processing method.
Background technology
Leather industry has become in light industry one of the high water consumption, heavy polluted industry that are only second to paper-making industry, for ox-hide process hides, every processing ox-hide leather needs water consumption 0.8-1.0t, current China leather industry every year to the wastewater flow rate of environmental emission be 8000 ~ 1,200 ten thousand tons, leather-making technology mainly contains degreasing, deliming, eases back, chrome tanning, retanning, neutralization, the operation such as dye fixing and washing, wherein chrome tanning, retanning procedures use a large amount of containing chrome tanning agent (as: chromium powder) usually, cause producing a large amount of high-concentration chromium-containing wastewaters, Cr
3+content is generally 60 ~ 1500mg/L, if not in addition process can cause serious pollution and waste, therefore develop effective leather-making waste water treatment method and have very important significance.
Dextran production industry adopts alkaline process to extract from cell walls usually, a large amount of strong basicity waste water or waste residue can be produced in leaching process, this type of waste water or waste residue cannot be recycled, treating processes needs to consume a large amount of acid, therefore the present invention considers the waste liquid after adopting alkalinity extraction dextran or waste residue as additive to process leather-making waste water, waste recycling, reduces cost for wastewater treatment.
Summary of the invention
The object of the invention is to solve the deficiency that the method for wastewater treatment cost of prior art is high, provide a kind of leather-making waste water diversion processing method, the method has reaction conditions gentleness, and speed of response is very fast, treatment facility less investment, the advantage that treatment effect is good.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of leather-making waste water diversion processing method, described treatment process is carried out in the steps below:
(1) containing after chromium, the leather-making waste water of ammonia nitrogen and the water of productive use of other operation are shunted of each operation is collected to settling tank;
(2) in settling tank, add during alkalinity extraction dextran is produced pH to 8.0 ~ 10.0 of waste liquid or the waste residue adjustment leather-making waste water produced, be then warming up to 30 ~ 45 DEG C, reaction 5 ~ 8h, be then separated and remove precipitation;
(3) leather-making waste water removed after precipitation is passed through the process of SBR equalizing tank again.
Chromium (Cr in leather-making waste water
3+) very high, effectively remove chromium (Cr
3+) extremely important to the effect of tannery wastewater treatment, the waste liquid after alkalinity extraction dextran or waste residue are strong basicity, add after in leather-making waste water and react, chromium (Cr
3+) form Precipitation, fully can remove the chromium (Cr in leather-making waste water
3+); In addition, contain residual dextran in the waste liquid after alkalinity extraction dextran or waste residue, have certain flocculating effect as macromolecular dextran, in leather-making waste water, adsorb various particulate, between particulate " bridge formation ", thus promote that particulate gathers; Meanwhile, dextran can adsorb metal ion in leather-making waste water as Ca
2+, Zn2
+, Na
+, Cr
3+deng, leather-making waste water after step (2) process enters SBR again and reconciles pond process, the load of SBR treatment pool reduces greatly, the murder by poisoning that SBR reconciles the metal ion that microorganism is subject in the treating processes of pond obviously reduces, processing efficiency significantly improves, effectively can remove ammonia nitrogen etc., make high qualified discharge.
As preferably, step also adds appropriate active bentonite and/or polyacrylamide in (2).The high adsorption capacity of active bentonite, add active bentonite, the metal ion in further active adsorption leather-making waste water is as Ca
2+, Zn2
+, Na
+, Cr
3+deng; Polyacrylamide is efficient flocculation agent, can effectively supplement the flocculating effect of dextran, strengthen.
More preferably, the consumption of described active bentonite is 5 ~ 8% of leather-making waste water quality, and the consumption of described polyacrylamide is 0.2 ~ 0.5% of leather-making waste water quality.The addition of active bentonite and polyacrylamide is reasonable, and raw materials cost is saved, and treatment effect is good.
As preferably, in step (2) is separated the leather-making waste water after removing precipitation, again adds during alkalinity extraction dextran is produced the waste liquid or waste residue that produce, maintains pH8.5 ~ 9.0, temperature 30 ~ 35 DEG C, reaction 2 ~ 3h, be then separated and remove precipitation.Secondary adds during alkalinity extraction dextran is produced the waste liquid or waste residue that produce, removes the Cr in leather-making waste water further
3+.
As preferably, in the waste liquid produced in described alkalinity extraction glucose production, the massfraction of dextran is 0.5 ~ 1.2%.
The invention has the beneficial effects as follows: utilize the waste liquid after alkalinity extraction dextran or waste residue to process leather-making waste water, waste recycling, has treatment facility less investment, the advantages such as treatment process is reasonable, processing efficiency is high, processing cost is low.
Embodiment
Below by specific embodiment, technical scheme of the present invention is described in further detail.
embodiment 1:
A kind of leather-making waste water diversion processing method, described treatment process is carried out in the steps below:
(1) containing after chromium, the leather-making waste water of ammonia nitrogen and the water of productive use of other operation are shunted of each operation in tanning production workshop is collected to settling tank, recording total chrome content is 100mg/L, and ammonia-nitrogen content is 800mg/L;
(2) in above-mentioned settling tank, add during alkalinity extraction dextran is produced the pH to 8.0 that the waste liquid produced regulates leather-making waste water, in the waste liquid produced in described alkalinity extraction glucose production, the massfraction of dextran is 0.5%, then 45 DEG C are warming up to, reaction 5h, add the active bentonite of leather-making waste water quality 5% again, then be separated and remove precipitation, recording total chrome content is 1.0mg/L, and chromium clearance is 99.0%;
(3) leather-making waste water removed after precipitation is passed through the process of SBR equalizing tank again, remove ammonia nitrogen, ammonia-nitrogen content is reduced to 30mg/L, and ammonia nitrogen removal frank reaches 96.25%, meets the index request of total chromium and ammonia nitrogen in trade effluent comprehensive discharge standard (GB8978-1996).
embodiment 2:
A kind of leather-making waste water diversion processing method, described treatment process is carried out in the steps below:
(1) by each operation in tanning production workshop containing chromium, shunt containing the leather-making waste water of ammonia nitrogen and the water of productive use of other operation after be collected to settling tank, recording total chrome content is 120mg/L, and ammonia-nitrogen content is 1000mg/L;
(2) in above-mentioned settling tank, add during alkalinity extraction dextran is produced the pH to 10.0 that the waste liquid produced regulates leather-making waste water, in the waste liquid produced in described alkalinity extraction glucose production, the massfraction of dextran is 1.2 %, then 30 DEG C are warming up to, reaction 8h, add the active bentonite of leather-making waste water quality 8% and the polyacrylamide of 0.2% again, then be separated and remove precipitation, recording total chrome content is 2.2mg/L, and chromium clearance is 98.2%;
Again add during alkalinity extraction dextran is produced the waste liquid produced, in the waste liquid produced in described alkalinity extraction glucose production, the massfraction of dextran is 1.2 %, maintain pH8.5, temperature 30 DEG C, reaction 3h, then be separated and remove precipitation, again recording total chrome content is 1.0mg/L, and chromium clearance is 99.2%;
(3) leather-making waste water after above-mentioned removal precipitation is passed through the process of SBR equalizing tank again, remove ammonia nitrogen, ammonia-nitrogen content is reduced to 30mg/L, and ammonia nitrogen removal frank reaches 97.0%, meets the index request of total chromium and ammonia nitrogen in trade effluent comprehensive discharge standard (GB8978-1996).
embodiment 3:
A kind of leather-making waste water diversion processing method, described treatment process is carried out in the steps below:
(1) by each operation in tanning production workshop containing chromium, shunt containing the leather-making waste water of ammonia nitrogen and the water of productive use of other operation after be collected to settling tank, recording total chrome content is 100mg/L, and ammonia-nitrogen content is 800mg/L;
(2) in above-mentioned settling tank, add during alkalinity extraction dextran is produced the pH to 9.0 that the waste liquid produced regulates leather-making waste water, in the waste liquid produced in described alkalinity extraction glucose production, the massfraction of dextran is 0.8%, then 40 DEG C are warming up to, reaction 6h, add the active bentonite of leather-making waste water quality 8% and the polyacrylamide of 0.5% again, then be separated and remove precipitation, recording total chrome content is 1.8mg/L, and chromium clearance is 98.2%;
Again add during alkalinity extraction dextran is produced the waste liquid produced, in the waste liquid produced in described alkalinity extraction glucose production, the massfraction of dextran is 0.8 %, maintain pH9.0, temperature 35 DEG C, reaction 2h, then be separated and remove precipitation, again recording total chrome content is 1.0mg/L, and chromium clearance is 99.0%;
(3) leather-making waste water removed after precipitation is passed through the process of SBR equalizing tank again, remove ammonia nitrogen, ammonia-nitrogen content is reduced to 20mg/L, and ammonia nitrogen removal frank reaches 97.5%, meets the index request of total chromium and ammonia nitrogen in trade effluent comprehensive discharge standard (GB8978-1996).
Above-described embodiment is one of the present invention preferably scheme, not does any pro forma restriction to the present invention, also has other variant and remodeling under the prerequisite not exceeding the technical scheme described in claim.
Claims (5)
1. a leather-making waste water diversion processing method, is characterized in that: described treatment process is carried out in the steps below: shunting containing chromium, the leather-making waste water of ammonia nitrogen and the water of productive use of other operation of each operation is collected to settling tank by (1); (2) in settling tank, add during alkalinity extraction dextran is produced pH to 8.0 ~ 10.0 of waste liquid or the waste residue adjustment leather-making waste water produced, be warming up to 30 ~ 45 DEG C, reaction 5 ~ 8h, be then separated and remove precipitation; (3) leather-making waste water removed after precipitation is passed through the process of SBR equalizing tank again.
2. a kind of leather-making waste water diversion processing method according to claim 1, is characterized in that: step also adds appropriate active bentonite and/or polyacrylamide in (2).
3. a kind of leather-making waste water diversion processing method according to claim 2, is characterized in that: the consumption of described active bentonite is 5 ~ 8% of leather-making waste water quality, the consumption of described polyacrylamide is 0.2 ~ 0.5% of leather-making waste water quality.
4. a kind of leather-making waste water diversion processing method according to claim 1 or 2 or 3, it is characterized in that: in step (2) is separated the leather-making waste water after removing precipitation, again add during alkalinity extraction dextran is produced the waste liquid or waste residue that produce, maintain pH8.5 ~ 9.0, temperature 30 ~ 35 DEG C, reaction 2 ~ 3h, is then separated and removes precipitation.
5. a kind of leather-making waste water diversion processing method according to claim 1 or 2 or 3, is characterized in that: in the waste liquid that described alkalinity extraction dextran produces in producing, the massfraction of dextran is 0.5 ~ 1.2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310265376.0A CN104250054B (en) | 2013-06-28 | 2013-06-28 | A kind of leather-making waste water diversion processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310265376.0A CN104250054B (en) | 2013-06-28 | 2013-06-28 | A kind of leather-making waste water diversion processing method |
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| Publication Number | Publication Date |
|---|---|
| CN104250054A CN104250054A (en) | 2014-12-31 |
| CN104250054B true CN104250054B (en) | 2015-10-21 |
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| CN201310265376.0A Active CN104250054B (en) | 2013-06-28 | 2013-06-28 | A kind of leather-making waste water diversion processing method |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1265151A1 (en) * | 1984-11-11 | 1986-10-23 | Украинский Институт Инженеров Водного Хозяйства | Method of preparing waste water for biological treatment with active silt |
| US6905863B2 (en) * | 2002-03-21 | 2005-06-14 | Council Of Scientific And Industrial Research | Aerobic method of removing total dissolved solids (TDS) from tannery wastewaters |
| JP2004230338A (en) * | 2003-01-31 | 2004-08-19 | Nippon Steel Corp | Method for removing ammonia nitrogen compound from waste water |
| CN104478093B (en) * | 2007-04-12 | 2016-06-01 | 诺维信生物股份有限公司 | Wastewater treatment |
| CN101830595B (en) * | 2009-03-11 | 2013-06-26 | 江西金达莱环保股份有限公司 | Method for treating leather-making industrial wastewater |
| CN102417275B (en) * | 2011-10-14 | 2013-09-25 | 浙江富春江环保热电股份有限公司 | System and method for comprehensive treatment of pickling process waste water and leather-making process waste water |
| CN202297309U (en) * | 2011-10-14 | 2012-07-04 | 浙江富春江环保热电股份有限公司 | System for comprehensively treating wastewater generated in pickling process and tanning process |
| CN102908998B (en) * | 2012-11-09 | 2014-07-30 | 济南大学 | Preparation method of xanthate macro-pore dextrangel adsorbent |
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2013
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Denomination of invention: A method for separating and treating tannery wastewater Effective date of registration: 20231218 Granted publication date: 20151021 Pledgee: Zhejiang Tongxiang rural commercial bank Limited by Share Ltd. Gaoqiao sub branch Pledgor: TONGXIANG GAOQIAO LEATHER Co.,Ltd. Registration number: Y2023980071624 |