CN1256253A - Biological acid process for separating lignin from alkaline paper-making black liquor - Google Patents
Biological acid process for separating lignin from alkaline paper-making black liquor Download PDFInfo
- Publication number
- CN1256253A CN1256253A CN98125200A CN98125200A CN1256253A CN 1256253 A CN1256253 A CN 1256253A CN 98125200 A CN98125200 A CN 98125200A CN 98125200 A CN98125200 A CN 98125200A CN 1256253 A CN1256253 A CN 1256253A
- Authority
- CN
- China
- Prior art keywords
- black liquor
- xylogen
- analysis method
- acid analysis
- acid
- 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.)
- Granted
Links
Images
Classifications
-
- Y02W10/12—
Landscapes
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Paper (AREA)
Abstract
Soda paper-making black liquor is blended to obtain solution with solid content of 7-10% and pH value of 10, into the solution acid-producing microbial strain Saccharomyces cerevisiae Meyen ex Hansen is inoculated and small amount of waste molasses is added, and through static culture at 35 deg.c for 48-72 hr, the pH value of black liquor is made to reduce to 5 and lignin over 90% may be precipitated and separated. The process is simple and low in cost and produces no secondary pollution, and the separated lignin may be used as raw material for organic slow-release fertilizer and fertilizer adhesive. The biological separation process is suitable for various soda paper-making black liquor.
Description
The invention belongs to the separation method of xylogen in the papermaking black liquor wastewater.
Alkali paper-making black liquor is the waste liquid that paper making raw material (timber, rice wheat straw, reed, bagasse etc.) is discharged behind alkali lye boiling delignification, be the source of pollution of paper industry maximum, mainly contain xylogen, sugar and sodium salt three big compositions, wherein contained xylogen is one of main pollutent (black of black liquor promptly is to be caused by xylogen).After black liquor removes delignification, BOD
5, COD can descend more than 50%, colourity can descend more than 90%, its pollution load reduces greatly, industrial lignin can be used for making multiple Chemicals.But because conventional black liquor lignin separation method cost is higher, limited the large-scale application of industrial lignin, influenced the optimum improvement of paper waste, therefore, the separation of black liquor xylogen is the gordian technique of xylogen utilization and papermaking wastewater Pollution abatement problem.
At present, Chinese scholars method that the separation of lignin from alkaline paper-making black liquor is adopted mainly contains following several:
(1) the mineral acid precipitator method: xylogen is dissolved state in alkaline environment, and then precipitation is separated out in sour environment.Add in the alkaline black liquor (more than the pH11) with sulfuric acid, phosphoric acid or hydrochloric acid, black liquor pH is converted to below 4, promptly have the xylogen precipitation more than 90% to separate out.This law is used comparatively general, and part is applied, but because the adding of mineral acid has increased secondary pollution and acid consumption is big, per minute need consume about 0.6 ton dense H from one ton of xylogen
2SO
4, the cost height has limited large-scale promotion application.
(2) carbon dioxide separation method: it is 30% that black liquor is concentrated into solid content, feeds pure CO in black liquor
2Gas keeps air pressure 1.5Mpa, and 60 minutes, black liquor pH reduced to about 7.8, and about 40% xylogen is precipitable separating out.This law can only be reduced to black liquor pH about 7.8, and the xylogen amount of separating out is less, and the concentrated black liquor big energy-consuming, and separation costs is higher.
(3) stack gas partition method: in black liquor, feed stack gas, the SO that utilizes in the stack gas to be contained
2And CO
2Gas is reduced to about 7.8 black liquor pH, and about 40% xylogen is precipitable separating out.Though this law is waste recycling, there is the existing shortcoming of carbon dioxide separation method equally in reduction separation costs that can be suitable.
(4) ultrafiltration process: ultra-filtration membrane adopts polysulfone membrane and polyacrylonitrile film.Black liquor is removed the larger particles material through fine screen mesh, carries out ultrafiltration then.Ultrafiltration process reclaims the slow and ultra-filtration membrane of xylogen speed and often need wash and change, because of its process cost higher, can't be in industrial application.
(5) ion exchange method: with the small molecule salt in the snake dragon resin isolation rugose wood cellulose solution, separate reducing sugar in the rugose wood cellulose solution with passing through sulfonate resin mutually, and with macropore and gel sulfonate resin to the xylogen grading.This law complicated operation only is applicable to the separation of laboratory small amount of sample and refining, can't be in industrial application.
(6) precipitation agent partition method: the someone has developed the LB-1 flocculation agent and has administered alkali paper-making black liquor, has obtained the two recovery of alkali and lignin.But owing to add the precipitation agent complicated component, add-on is big, influences the purity and the performance of xylogen.The precipitation agent price is also comparatively expensive.
The object of the present invention is to provide a kind of industrial applications, economical and convenient of being applicable to not cause the bioseparation method of the lignin from alkaline paper-making black liquor of secondary pollution again, comprise the screening of bacterial classification and the acidogenic fermentation condition of black liquor.
The bioseparation ratio juris is based on and contains in the black liquor and can add acid-producing microorganisms in black liquor for the abundant sugar and the nitrogenous source of microorganism utilization, and sugar is converted into organic acid and tropina, makes the black liquor acidifying, reaches the purpose of separating lignin.Because microorganism has utilized the sugar in the black liquor, thereby reduced black liquor Organic pollutants load, simultaneously, microbial cells can adsorb tiny xylogen suspended particle, has the effect that promotes the xylogen particle flocculation, accelerates filtering speed.Tropina can increase the nitrogen content of xylogen, improves the fertilizer efficiency of making organic slow-release fertilizer with xylogen.
The used acid-producing microorganisms of the present invention is a yeast saccharomyces cerevisiae (Saccharomycescerevisiae Meyen ex Hansen) by the public sale of Chinese common micro-organisms culture presevation administrative center, this microorganism can be in black liquor growth and breeding and produce acid strongly.
The invention provides six accompanying drawings:
Fig. 1 solid content is to the influence of production by biological acid;
Fig. 2 culture temperature is to the influence of production by biological acid;
The initial pH of Fig. 3 black liquor is to the influence of production by biological acid;
Fig. 4 black liquor acid out settling curve;
Fig. 5 black liquor production by biological acid-fermentation growth curve;
Fig. 6 process flow diagram.
Below in conjunction with accompanying drawing the present invention is set forth, determine reality by following 8 experiments Execute condition required for the present invention. Best black liquor solid content is determined in experiment 1
Get straw pulp black liquor as experiment material, black liquor is added water be deployed into solid content respectively Be 2.5%, 5%, 7.5% and 10%,, add 1.5% and give up black liquor pH furnishing 10 with sulfuric acid Molasses insert the acid-producing microorganisms bacterial classification, place static cultivation in 35 ℃ of insulating boxs, every 12 Hour measure black liquor pH value.
Solid content is more high, and the amplitude that pH reduces is just more little. Solid content reaches 7.5% The time, the pH that cultivates when stopping can reach 5, and (seeing Fig. 1), solid content is more high, black liquor In osmotic pressure also just more high, suppress microbial growth, it is also just relatively poor to produce sour effect, uses Bioanalysis separates lignin of black liquid, and when the pH value dropped to 5, the lignin of black liquid extrusion rate could Reach more than 90%, therefore best solid concentration is chosen in 7.5%. Test 2 best acidogenic fermentation temperature
Get straw pulp black liquor as experiment material, adding water, to be deployed into solid concentration be 7.5%, with sulfuric acid with black liquor pH furnishing 10, add 1.5% waste molasses, insert the acid-producing microorganisms bacterial classification,, measured black liquor pH value every 12 hours respectively 25 ℃, 30 ℃, 35 ℃ and 40 ℃ of static cultivations.
Experimental result show optimum culturing temperature be the acidifying of 35 ℃ of (see figure 2) black liquor be since the vital movement of saccharomyces acidifaciens due to, 35 ℃ of saccharomycetic just optimum growth temps.Test 3 best black liquor initial pH value
Get straw pulp black liquor as experiment material, adding water, to be deployed into solid concentration be 7.5%, with sulfuric acid with black liquor pH value furnishing 5,6,7,8,9,10,11,12, add 1.5% waste molasses, insert the acid-producing microorganisms bacterial classification, cultivate down, measured black liquor pH value every 12 hours at 35 ℃.
When the initial pH value of black liquor greater than 10 the time, it is relatively poor to produce sour effect, when the pH value was 12, black liquor pH value raise on the contrary, the pH value is produced the better (see figure 3) of sour effect when 7-10.The growth of saccharomyces acidifaciens and physiological metabolism and black liquor potential of hydrogen are closely related, and during pH value 12, yeast may be dead, and the ammonia that thalline self-dissolving degraded produces makes the rising of black liquor pH value, and saccharomyces acidifaciens is well-grown in suitable alkaline environment, thereby it is better to produce sour effect.With final pH value 5 is standard, and the initial pH value of black liquor is 10 to get final product.Carbon source kind and quantity are added in experiment 4 in black liquor
Get straw pulp black liquor as experiment material, add glucose, sucrose, starch and the waste molasses of 0.5%-2.5% in black liquor, the initial pH of black liquor was 10, inserts the acid-producing microorganisms bacterial classification, cultivates down at 35 ℃, measured black liquor pH value every 12 hours.
It is less not add the amplitude that carbon source black liquor pH value reduces, and the final pH value can reach 6.5, adds four kinds of carbon sources and all can significantly accelerate acid process, and the final pH value can reach below 5, in four kinds of carbon sources with the effect of waste molasses best (table 1).
Carbon source is the basic substance that acid-producing microorganisms produces acid, and the carbon source that can utilize contained in the straw pulp black liquor is limited, and as not adding carbon source, final black liquor pH value can not reach below 5.Waste molasses best results in several carbon sources in the sugar industry and the most cheap, the effect of starch is relatively poor, therefore selects for use waste molasses as the carbon source additive.Other nutrition are added in experiment 5 in black liquor
Get straw pulp black liquor as experiment material, in black liquor, add nitrogenous source (sulfate of ammoniac of 5g/L), phosphorus source (5g/L potassium primary phosphate) and trace element (manganese of 0.1g/L, magnesium, molysite) respectively and only add carbon source (1.5% glucose) and raw black liquid relatively.
Nitrogenous source has less synergism in three kinds of additives, and phosphorus source and trace element all inoperative (seeing Table 2) illustrate and do not lack these compositions in the black liquor, consider that from the angle that reduces cost only adding carbon source gets final product.Acid plays a driving role carbon source to production by biological, and this points out us can utilize the waste material that is rich in carbohydrate to carry out the bioseparation of black liquor xylogen.
Table 1 add carbon source to the kind sugar addition pH value variation that influences sugar of production by biological acid/(hour)
0 hour 12 hours 24 hours 36 hours 48 hours 60 hours 72 hours
0% 10 9.8 9.4 8.4 7.8 7.6 7.1 glucose, 0.5% 10 9.2 8.6 7.8. 6.8 5.1 5.3
1.0％ 10 9.0 8.1 7.1 6.2 4.9 5.2
1.5％ 10 8.8 6.5 6.5 5.2 4.6 4.6
2.0％ 10 8.6 7.2 6.1 4.9 4.6 4.7
2.5％ 10 8.3 7.0 6.0 4.8 4.5 4.6
0.5% 10 9.3 8.5 7.7 6.5 5.5 5.7 sucrose 1.0% 10 9.1 8.0 7.3 5.5 5.0 5.0
1.5％ 10 8.9 7.6 6.7 5.4 4.8 4.9
2.0％ 10 8.5 7.4 6.3 5.0 4.6 4.6
2.5％ 10 8.3 7.2 5.9 4.6 4.5 4.6
0.5% 10 9.6 9.0 8.5 7.7 6.8 6.1 starch 1.0% 10 9.4 8.9 8.1 7.1 6. 5.8
2.0％ 10 9.0 8.1 7.2 6.0 5.2 4.9
2.5％ 10 8.8 7.4 6.5 5.8 4.8 4.8
0.5% 10 9.0 8.0 6.9 6.0 4.8 4.8 waste molasses 1.0% 10 8.7 7.7 6.0 4.7 4.5 4.6
1.5％ 10 8.4 7.4 5.8 4.6 4.5 4.5
2.0％ 10 8.1 7.2 5.4 4.5 4.4 4.5
2.5％ 10 8.0 7.0 5.1 4.4 4.4 4.4
Other nutrition of table 2 to the variation that influences experiment numbers pH value of production by biological acid/(hour)
0 hour 12 hours 24 hours 36 hours 48 hours 60 hours 72 hours 1 black liquor, 10 9.8 9.4 8.4 7.8 7.6 7.12 1.5%glucose+1,10 9.0 8.1 7.1 6.2 4.9 5.23 5g/L (NH
4)
2SO
4+ 2 10 8.5 7.7 6.8 6.0 4.7 4.94 5g/L KH
2PO
4+ 3 10 8.4 7.8 6.7 5.9 4.8 4.85 0.1g/L Mn
2+, Mg
2+, Fe
2+The variation and the lignin recovery rate of viable count, pH value and sugar degree in+the 4 10 8.3 7.9 6.8 6.0 4.9 4.8 experiments 6 black liquor fermenting processs
Get straw pulp black liquor as experiment material, adding water, to be deployed into solid concentration be 7.5%, with black liquor pH furnishing 10, adds 1.5% waste molasses with sulfuric acid, inserts the acid-producing microorganisms bacterial classification, cultivates down at 35 ℃, measured a viable count every 12 hours.With sample 10000 rev/mins centrifugal 20 minutes, get supernatant liquor and measure total reducing sugar, reducing sugar, sucrose and content of lignin,
The reduction of pH value lags behind the growth of viable count, the reduction of total reducing sugar, reducing sugar, sucrose and pH value be lowered into the positive correlation (see figure 5).Illustrate that growing microorganism was only the sour physiological metabolism of product then before this.Sugar has changed into tropina and organic acid.Remove the black liquor of delignification behind the acidogenic fermentation, sugar degree has descended much than unsweetened original black liquor, reduced pollution load, the lignin recovery rate reaches 92.4% (seeing Table 3) and reaches 1.72% by the isolated xylogen nitrogen content of biological acid process for separating after measured, is higher than inorganic acid-precipitation method xylogen (nitrogen content 0.70%) one percentage point.This xylogen is a desirable feedstock of making organic slow-release fertilizer.Test the comparison of the 7 biological acid out precipitation black liquor xylogen and the mineral acid precipitator method
Under different pH, measure the content (with black liquor at the OD at 208nm place value representation) of xylogen in the black liquor with bioseparation method and dilute sulphuric acid precipitation black liquor xylogen and make settling curve.Black liquor when getting 1000ml bioseparation method pH5 and inorganic acid system pH4 respectively is with quantitative paper natural filtration on the glass funnel of diameter 25cm, record filtering time.The xylogen precipitation capacity of biological process is bigger than inorganic acid system under identical pH, suitable (see figure 4) when effect when black liquor PH5 and inorganic acid system pH4, and have only 1/5th (tables 4) of inorganic acid system with the used filtration time of bioseparation method.It is better than the mineral acid precipitation to illustrate with the effect of bioseparation method precipitation xylogen, and the yeast thalline has adsorption to the xylogen fine particle, has the effect that promotes flocculation, is easy to precipitate and filter.
Sugared content situation test specimens total sugar content before and after the table 3 black liquor acidogenic fermentation, (g/L) reducing sugar content, (g/L) sucrose content, (g/L) content of lignin, (g/L) black liquor, (admittedly capable thing content 7.5%) 20.5 14.3 1.2 33.6 black liquor+1.5% waste molasses, (before the fermentation) 32 10 14 33.6 black liquor+1.5% waste molasses, (fermentation back) 8.3 2.5 0.7 2.48
Table 4 filtration test
The biological acid out of the biological acid out black liquor filtration time of inorganic acid out black liquor (h) 5.5 1.2 experiments 8 other raw material alkali paper-making black liquors.
With alkali technique pulp, reed pulp and bagasse pulp black liquor furnishing solid content 7.5%, initial pH10, pulp black liquor adds 1% waste molasses, and the reed pulp black liquor adds 1.5% waste molasses, and the bagasse pulp black liquor is not with waste molasses, insert the acid-producing microorganisms bacterial classification, cultivated 72 hours down at 35 ℃, black liquor pH value all can drop to below 5, and the lignin recovery rate reaches and (sees Table 5 more than 90%, 6), illustrate that thus biological acid process for separating has adaptability widely.Can offer the competent carbon source of acid-producing microorganisms because of containing higher sucrose in the bagasse pulp black liquor, therefore can not make black liquor pH reduce to 5 with waste molasses.
The variation of the biological acid out black liquor of the xylogen kind pH value of different slurry kind of the black liquor of table 5/(hour)
0 hour 12 hours 24 hours 36 hours 48 hours 60 hours 72 hours wood pulp black liquor 10 8.7 8.2 7.2 6.1 5.4 4.9 reed pulp black liquor 10 8.9 7.8 6.8 5.9 5.0 4.8 bagasse pulp black liquor 10 9.0 8.3 7.0 6.2 5.3 4.8
Other slurry kind of black liquor biological acid process for separating xylogen extrusion rate black liquor kind content of lignin (g/L) lignin extraction rates (%) of table 6
Wood pulp 3.5 0.32 90.9 reed pulps 2.7 0.24 91.1 bagasse pulps 2.3 0.16 93.0 behind the fermentation primary fermentation
Go out operation steps of the present invention shown in Fig. 6 process flow diagram by above eight experimental summaries.The pre-treatment of black liquor
With the method for thin up black liquor being modulated into solid content is 7%-10%, and the black liquor that alkalitropism is very strong (more than the pH11) feeds CO under normal pressure then
2Make black liquor pH reduce to 10.The acidogenic fermentation of black liquor
According to what of reducing sugar in the black liquor and sucrose content, add or not with waste molasses, if reducing sugar or sucrose content are higher than 1.5% in the black liquor, can be not with waste molasses, if be lower than 1.5%, need add the sugared content that Gong microorganism that waste molasses makes in the black liquor to be contained utilizes and reach 1.5%, then adding acid-producing microorganisms bacterial classification in black liquor, 35 ℃ of static heat insulating culture 48～72hr, pH reduces to 5 and gets final product.This moment, the xylogen precipitation was separated out.Precipitate and separate
Black liquor after fermentation finishes filters or is centrifugal, and collecting precipitation promptly gets the xylogen finished product after the drying.The rate of recovery of xylogen can reach more than 90%.
Concrete characteristics of the present invention and beneficial effect: (1) only needs to add certain can being got final product by the carbohydrate that acid-producing microorganisms utilizes in black liquor, need not add other any nutrition.Can make full use of the nutrient that contains in the black liquor and be translated into organic acid and tropina, both acidifying black liquor reach the purpose of separating lignin, reduced the Organic pollutants load of black liquor again, separation costs lower (only be inorganic acid-precipitation method 30%); (2) because biological acid process for separating acidifying final pH is 5, and acidity is not strong, and is less to the acid pollution degree that environment caused, the acid of generation is that organic acids such as lactic acid, acetic acid can be transformed by natural other Institute of Micro-biology, thereby can not cause secondary pollution; (3) because the yeast thalline has throwing out, quickened the precipitate and separate process, made xylogen that sedimentary pH value take place and raise, suitable when the separating effect of usefulness this law pH5 and inorganic acid-precipitation method pH4, and filtration velocity is accelerated 5 times; (3) microbial cells remains in the xylogen, can increase the nitrogen content of isolating xylogen, be the desirable feedstock of making organic slow-release fertilizer and fodder additives with the isolating xylogen of the present invention; (4) biological acid process for separating is applicable to the soda pulping black liquor of all raw materials commonly used.
When specifically implementing, this law only needs between the pulp car of paper mill, to install several storage tanks and CO
2Steel cylinder carries out anaerobically fermenting by temperature higher between pulp car (30-40 ℃) and can realize, need not workshop building and strict aseptic condition.
The xylogen bioseparation of embodiment 1. conifers raw material alkaline pulping black liquors
With black liquor thin up to solid content is 7%, feeds CO
2PH reduces to 10 with black liquor, adds 0.5% waste molasses, adds behind the microbial liquid bacterial classification 35 ℃ of static cultivations 72 hours, and black liquor pH can reduce to 5, obtains the xylogen precipitation after filtration.
The xylogen bioseparation of embodiment 2. pourous wood class raw material alkaline pulping black liquors
With black liquor thin up to solid content is 8.5%, feeds CO
2PH reduces to 10 with black liquor, adds 0.9% waste molasses, adds behind the microbial liquid bacterial classification 35 ℃ of static cultivations 52 hours, and black liquor pH can reduce to 5, obtains the xylogen precipitation after filtration.
The xylogen bioseparation of embodiment 3. rice wheat straw raw material alkaline pulping black liquors
With black liquor thin up to solid content is 8.5%, feeds CO
2PH reduces to 10 with black liquor, adds 1% waste molasses, adds behind the microbial liquid bacterial classification 35 ℃ of static cultivations 48 hours, and black liquor pH can reduce to 5, obtains the xylogen precipitation after filtration.
The xylogen bioseparation of embodiment 4. alfa raw material alkaline pulping black liquors
With black liquor thin up to solid content is 9%, feeds CO
2PH reduces to 10 with black liquor, adds 1.5% waste molasses, adds behind the microbial liquid bacterial classification 35 ℃ of static cultivations 60 hours, and black liquor pH can reduce to 5, obtains the xylogen precipitation after filtration.
With black liquor thin up to solid content is 10%, feeds CO
2PH reduces to 10 with black liquor, not with waste molasses, adds behind the microbial liquid bacterial classification 35 ℃ of static cultivations 48 hours, and black liquor pH can reduce to 5, obtains the xylogen precipitation after filtration.
Claims (9)
1. the bionic acid analysis method of a lignin from alkaline paper-making black liquor is characterized in that described method comprises:
The pretreatment stage of black liquor: black liquor stoste thin up is become solid content 7-10%, feed CO
2Make black liquor pH value be reduced to 10;
The acidogenic fermentation stage of black liquor: insert the acid-producing microorganisms bacterial strain, produce sour static fermentation;
The precipitate and separate stage: the black liquor after fermentation finished filters or is centrifugal, and the collecting precipitation thing obtains the xylogen finished product after the drying, be used to make bio-feritlizer, fodder additives etc.
2. according to the bionic acid analysis method of the described xylogen of claim 1, it is characterized in that described acid-producing microorganisms is yeast saccharomyces cerevisiae (Saccharomyces cerevisiae Meyen ex Hansen).
3. according to the bionic acid analysis method of the described xylogen of claim 1, it is characterized in that being added in the black liquor a small amount of waste molasses.
4. according to the bionic acid analysis method of the described xylogen of claim 1, it is characterized in that under 35 ℃ of conditions of temperature static fermentation 48-72 hour.
5. according to the bionic acid analysis method of claim 1 or 4 described xylogen, it is characterized in that static cultivation is 52 hours behind the adding microorganism strains to being the alkaline pulping black liquor of raw material with the rice wheat straw.
6. according to the bionic acid analysis method of claim 1 or 4 described xylogen, it is characterized in that static cultivation is 60 hours behind the adding microorganism strains to being the alkaline pulping black liquor of raw material with the reed class.
7. according to the bionic acid analysis method of claim 1 or 3 or 4 described xylogen, it is characterized in that not with waste molasses, static cultivation is 48 hours behind the adding microorganism strains to being the alkaline pulping black liquor of raw material with bagasse.
8. according to the bionic acid analysis method of claim 1 or 4 described xylogen, it is characterized in that static cultivation is 72 hours behind the adding microorganism strains to being the alkaline pulping black liquor of raw material with the conifers.
9. according to the bionic acid analysis method of claim 1 or 4 described xylogen, it is characterized in that static cultivation is 52 hours behind the adding microorganism strains to being the alkaline pulping black liquor of raw material with the pourous wood class.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98125200A CN1105688C (en) | 1998-12-08 | 1998-12-08 | Biological acid process for separating lignin from alkaline paper-making black liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98125200A CN1105688C (en) | 1998-12-08 | 1998-12-08 | Biological acid process for separating lignin from alkaline paper-making black liquor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1256253A true CN1256253A (en) | 2000-06-14 |
| CN1105688C CN1105688C (en) | 2003-04-16 |
Family
ID=5229082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98125200A Expired - Fee Related CN1105688C (en) | 1998-12-08 | 1998-12-08 | Biological acid process for separating lignin from alkaline paper-making black liquor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1105688C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300412C (en) * | 2004-08-11 | 2007-02-14 | 山东泉林纸业有限责任公司 | Acid separated filtrate treating method for paper-making black liquor |
| CN101250568B (en) * | 2008-04-14 | 2011-07-20 | 大连工业大学 | Method for purifying lignin from paper-making black liquor by fermentation process |
| CN101475406B (en) * | 2009-01-13 | 2011-10-19 | 温奕区 | Method for producing thick slurry fertilizer from industrial waste organic based on the concept of 'using waste to control waste' |
| CN103757965A (en) * | 2014-01-15 | 2014-04-30 | 新疆国力源投资有限公司 | Biological alkali recovery process for papermaking black liquor |
| CN104263245A (en) * | 2014-09-29 | 2015-01-07 | 中南林业科技大学 | Method for separating tall oil and alkali lignin from waste crude tall oil residues |
| CN105152458A (en) * | 2015-07-18 | 2015-12-16 | 常州大学 | Method for separating and recovering lignin in paper-making wastewater |
| CN115448532A (en) * | 2022-08-20 | 2022-12-09 | 崇义县金竹矿业有限公司 | Method for treating fluorite beneficiation wastewater |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100445464C (en) * | 2006-09-18 | 2008-12-24 | 同济大学 | Method for lignin extraction by papermaking black liquor acidification and flocculation precipitation |
-
1998
- 1998-12-08 CN CN98125200A patent/CN1105688C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300412C (en) * | 2004-08-11 | 2007-02-14 | 山东泉林纸业有限责任公司 | Acid separated filtrate treating method for paper-making black liquor |
| CN101250568B (en) * | 2008-04-14 | 2011-07-20 | 大连工业大学 | Method for purifying lignin from paper-making black liquor by fermentation process |
| CN101475406B (en) * | 2009-01-13 | 2011-10-19 | 温奕区 | Method for producing thick slurry fertilizer from industrial waste organic based on the concept of 'using waste to control waste' |
| CN103757965A (en) * | 2014-01-15 | 2014-04-30 | 新疆国力源投资有限公司 | Biological alkali recovery process for papermaking black liquor |
| CN104263245A (en) * | 2014-09-29 | 2015-01-07 | 中南林业科技大学 | Method for separating tall oil and alkali lignin from waste crude tall oil residues |
| CN105152458A (en) * | 2015-07-18 | 2015-12-16 | 常州大学 | Method for separating and recovering lignin in paper-making wastewater |
| CN115448532A (en) * | 2022-08-20 | 2022-12-09 | 崇义县金竹矿业有限公司 | Method for treating fluorite beneficiation wastewater |
| CN115448532B (en) * | 2022-08-20 | 2023-11-21 | 崇义县金竹矿业有限公司 | Method for treating fluorite beneficiation wastewater |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1105688C (en) | 2003-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Leng et al. | Co-culture of fungi-microalgae consortium for wastewater treatment: A review | |
| CN101225405A (en) | Method for producing microbial flocculant and method of use thereof | |
| CN113264588B (en) | Composite carbon source for sewage treatment | |
| CN1105688C (en) | Biological acid process for separating lignin from alkaline paper-making black liquor | |
| CN113621674B (en) | Method for producing L-lactic acid by using liquor distiller grains | |
| CN1888079A (en) | Saccharizing process in glucose production | |
| CN113337549B (en) | Method for preparing different polyhydroxyalkanoates by directional acidification of pig manure | |
| CN113355099B (en) | Phosphogypsum soil conditioner and preparation method thereof | |
| CN1810734A (en) | Refuse composting process adding different decay promoting ferments separately and its decay promoting ferments | |
| CN1799363A (en) | Method for preparing bacillus thuringiensis microbiological pesticide by starch waste liquor | |
| CN1270799C (en) | Processing method for antibiotics bacterial slag containing zinc | |
| CN102600801B (en) | Preparation of waste potato residue/palygorskite composite adsorbent and application of adsorbent in treatment of potato starch processing wastewater | |
| CN1436895A (en) | Comprehensive utilization method of pulping potash black liquor in paper-making process | |
| CN1616358A (en) | Method for preparing biological flocculant from arthrobacter | |
| Sarwar et al. | Alkaline pre-treatment of wheat straw for production of ethanol using saccharomyces cerevisiae ss-4 immobilized in nanoparticles | |
| CN114410706A (en) | Denitrification liquid carbon source and preparation method and application thereof | |
| JPH10316702A (en) | Microbial chitosan and its production | |
| CN1139546C (en) | Biological flocculant prepared with Nocardia bacteria | |
| CN1033852A (en) | New technology of disposing pollutant black effluent from small pulp mill | |
| CN1253553C (en) | Ceramide bacillus and method for production of glycoprotein analog biological flocculant using same | |
| CN1872739A (en) | Method for carrying out biologic decolor for electric mother liquor of sodium glutamate | |
| CN111334533A (en) | Method for producing volatile fatty acid by promoting anaerobic fermentation of office waste paper and sludge by cellulase | |
| CN1114695C (en) | Method for producing alcohol by using plant fiber as raw material | |
| CN109095622B (en) | Method for promoting sludge to extract flocculant by using metazoan | |
| CN87100655A (en) | Method for producing L-sorbose |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |