CN104355461A - Method for preprocessing strong black liquor - Google Patents
Method for preprocessing strong black liquor Download PDFInfo
- Publication number
- CN104355461A CN104355461A CN201410722909.8A CN201410722909A CN104355461A CN 104355461 A CN104355461 A CN 104355461A CN 201410722909 A CN201410722909 A CN 201410722909A CN 104355461 A CN104355461 A CN 104355461A
- Authority
- CN
- China
- Prior art keywords
- black liquor
- cotton
- black liquid
- preprocessing
- concentrated black
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
Abstract
The invention discloses a method for preprocessing strong black liquor. The method comprises: adding nitro-cotton acid wastewater to the strong black liquor for mixing, adjusting the pH value to a range from 1.5 to 3.5, then adding a flocculant PAM, accomplishing the preprocessing after sedimentation and filtration, and feeding filter liquor to a biochemical treatment system. According to the method, the removal rate of lignin is more than 90%, the removal rate of COD is more than 40%; meanwhile, biotoxicity of the black liquor is decreased, biodegradability of the black liquor is increased, the operation is simple, the processing expense is low, and impact from the black liquor to microorganisms of a biochemical system is reduced.
Description
Technical field
The invention belongs to the field of waste water treatment in chemical industry treating processes, be specifically related to one and pretreated method is carried out to concentrated black liquid.
Background technology
Linters is the production of the nitro-cotton of raw material, is first to be combed after solution, removal of impurities through opener by linters, sprays into the alkali lye infiltration of finite concentration, temperature, quantity, through extruding mixing, carries out boiling by worm conveyor feeding steam cooker.Under the conditions of cooking of certain temperature and pressure, the fat in linters, wax are by saponification and emulsification, and nitrogenous substances, is dissolved in alkali lye after low-carbohydrate and cottonseed cot etc. are destroyed; The molecule " degraded " that cellulosic degree of polymerization is larger is the less molecule of the polymerization degree, the corresponding reduction of cotton fibre viscosity after " degraded " effect.After boiling, washed by cotton material with being pumped to continuous washing machine, wash away the residual alkali in cotton material and soluble impurity, the cotton material after washing carries out acidifying and bleaching, and then dewatered drying makes purified cotton.
Through at nitrated operation and certain nitric-sulfuric acid of Chenging Fen ﹑ Wen Du ﹑ quantity, there is nitrated rear reaction generation nitro-cotton in purified cotton.Nitro-cotton is washed through driving acid and boiling, and removes residual acid wherein.Nitro-cotton, after boiling and washing stable treatment and viscosity reduction, carries out dehydration and expelling water packaging.Nitrated operation produces a large amount of acid waste water, and nitro-cotton acid wastewater is mainly containing nitric acid, sulfuric acid, and sour water discharges after wastewater treatment is up to standard.
The skimming processes of purified cotton will produce a large amount of black liquor, and black liquor principal pollutant are Mierocrystalline cellulose, hemicellulose, xylogen, fat, pectin substance, caustic soda etc.Black liquor mainly comprises concentrated black liquid and thin phenol water.COD is high for purified cotton concentrated black liquid, and colourity is high, and basicity is high, and directly entering biochemical system can produce bio-toxicity to biochemical system microorganism and impact, and must carry out pre-treatment to it.Conventional pretreatment process has flocculence, iron-carbon micro-electrolysis, FENTON method etc.These methods all need to add medicament, medicament expense with and process cost higher.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of simple to operate, the concentrated black liquid pretreatment process of low cost.
The technical solution adopted for the present invention to solve the technical problems is: carry out pretreated method to concentrated black liquid, in concentrated black liquid, add nitro-cotton acid wastewater mixing, adjust ph to 1.5 ~ 3.5, then flocculation agent PAM (i.e. polyacrylamide) is added, after sedimentation, filtration, pre-treatment completes, and filtrate sends into biochemical treatment system.
Wherein, in aforesaid method, adjust ph to 2 ~ 2.5.
Wherein, in aforesaid method, after adding flocculation agent PAM, flocculation agent PAM content is in the solution 8 ~ 12PPM.
The invention has the beneficial effects as follows: the raw material nitro-cotton acid wastewater of the inventive method originally belongs to needs trade waste to be processed, and the amount of flocculation agent PAM only needs a small amount of 10PPM, therefore simple, the low cost of preprocessing process.Utilize the black liquor after the inventive method process, lignin removing rate more than 90%, COD clearance more than 40%; Reduce the bio-toxicity of black liquor simultaneously, its 50% press down light rate can drop to about 140 times by 250 times, black liquor bio-toxicity decline more than 40%; In addition, the biodegradability (ratio of B/C, BOD and COD that reflects the biodegradability of waste water) of black liquor obtains larger lifting, is promoted to about 0.3, is conducive to follow-up biochemical degradation by 0.2.
Embodiment
The present invention specifically can implement in such a way:
Carry out pretreated method to concentrated black liquid, add nitro-cotton acid wastewater mixing, adjust ph to 2 ~ 2.5, then add the flocculation agent PAM of 8 ~ 12PPM in concentrated black liquid, after sedimentation, filtration, pre-treatment completes, and filtrate sends into biochemical treatment system.
PH value of the present invention controls within the scope of 1.5-3.5, all have higher COD clearance, but considers running cost and COD clearance, and best PH is 2 ~ 2.5.By nitro-cotton acid wastewater and purified cotton black liquor combination treatment, the acidity of nitro-cotton acid wastewater can be utilized, after mixing with concentrated black liquid, the H+ in nitro-cotton sour water and the xylogen generation electrophilic substitution reaction in black liquor, H
+replace Na
+, generate indissoluble or water-fast xylogen, then by precipitation, it separated from black liquor.
Embodiment
In concentrated black liquid, add nitro-cotton acid wastewater mix, add-on reaches about 2.5 with pH value and is as the criterion, and then adds the flocculation agent PAM of 10PPM, its sedimentation is made after stirring, supernatant liquor directly sends into biochemical treatment system, and bottom mixture Plate Filtration, filtrate also sends into biochemical treatment system.Black liquor COD clearance about 45%, 50% after treatment presses down light rate and can drop to 140 times by 250 times, and lignin removing rate is 94%, and biodegradability is promoted to 0.3 by 0.2, can meet the requirement of biochemical system water inlet.
Claims (3)
1. pair concentrated black liquid carries out pretreated method, it is characterized in that: in concentrated black liquid, add nitro-cotton acid wastewater mixing, adjust ph to 1.5 ~ 3.5, then add flocculation agent PAM, and after sedimentation, filtration, filtrate sends into biochemical treatment system.
2. according to claim 1 pretreated method is carried out to concentrated black liquid, it is characterized in that: adjust ph to 2 ~ 2.5.
3. according to claim 1 and 2ly carry out pretreated method to concentrated black liquid, it is characterized in that: after adding flocculation agent PAM, flocculation agent PAM content is in the solution 8 ~ 12PPM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410722909.8A CN104355461A (en) | 2014-12-03 | 2014-12-03 | Method for preprocessing strong black liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410722909.8A CN104355461A (en) | 2014-12-03 | 2014-12-03 | Method for preprocessing strong black liquor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104355461A true CN104355461A (en) | 2015-02-18 |
Family
ID=52522802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410722909.8A Pending CN104355461A (en) | 2014-12-03 | 2014-12-03 | Method for preprocessing strong black liquor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104355461A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108864441A (en) * | 2017-10-13 | 2018-11-23 | 济宁明升新材料有限公司 | A method of extracting lignin from reducing rules treatment fluid |
| CN108864440A (en) * | 2017-10-13 | 2018-11-23 | 济宁明升新材料有限公司 | A method of extracting lignin from alkaline pulping black liquor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010087A (en) * | 2010-12-16 | 2011-04-13 | 北京中兵北方环境科技发展有限责任公司 | Method for treating nitro-cotton acid wastewater |
| CN102267780A (en) * | 2011-06-24 | 2011-12-07 | 北京中兵北方环境科技发展有限责任公司 | Treatment method for wastewater containing refined cotton |
| CN103641278A (en) * | 2013-12-19 | 2014-03-19 | 北京北方节能环保有限公司 | System and method for treating purified cotton production wastewater by adopting anoxic processes |
-
2014
- 2014-12-03 CN CN201410722909.8A patent/CN104355461A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010087A (en) * | 2010-12-16 | 2011-04-13 | 北京中兵北方环境科技发展有限责任公司 | Method for treating nitro-cotton acid wastewater |
| CN102267780A (en) * | 2011-06-24 | 2011-12-07 | 北京中兵北方环境科技发展有限责任公司 | Treatment method for wastewater containing refined cotton |
| CN103641278A (en) * | 2013-12-19 | 2014-03-19 | 北京北方节能环保有限公司 | System and method for treating purified cotton production wastewater by adopting anoxic processes |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108864441A (en) * | 2017-10-13 | 2018-11-23 | 济宁明升新材料有限公司 | A method of extracting lignin from reducing rules treatment fluid |
| CN108864440A (en) * | 2017-10-13 | 2018-11-23 | 济宁明升新材料有限公司 | A method of extracting lignin from alkaline pulping black liquor |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150218 |
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| RJ01 | Rejection of invention patent application after publication |