CN1587507A - Acid separated filtrate treating method for paper-making black liquor - Google Patents
Acid separated filtrate treating method for paper-making black liquor Download PDFInfo
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- CN1587507A CN1587507A CN 200410058073 CN200410058073A CN1587507A CN 1587507 A CN1587507 A CN 1587507A CN 200410058073 CN200410058073 CN 200410058073 CN 200410058073 A CN200410058073 A CN 200410058073A CN 1587507 A CN1587507 A CN 1587507A
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Abstract
The present invention disclose treating process of acid separated filtrate from papermaking black liquor, and belongs to the field of water treatment. The treating process of the present invention includes microbial treatment of the filtrate, treating with R0 film to eliminate 60-70 % of the water and to obtain concentrated liquid, adding alkali to regulate pH to 6.5-7.0, drying to water content of 8-10 %, adding quartzite with the weight ratio between dried material and quartzite being 0.1-1 and the mixture modulus being controlled in 2.5-3.4, and calcining the mixture in calcining furnace to prepare water glass. The present invention produces water glass while treating acid separated filtrate.
Description
Technical field:
The present invention relates to a kind of processing method of acidified filtrate of black liquid, belong to water treatment field.
Background technology:
Acidified filtrate is the product after black liquor of pulp making adopts the lignin acidizing separation PROCESS FOR TREATMENT, although the organic pollution load of 80%--90% is removed, the certain pollutional load of tool still in the filtrate can not directly efflux.Someone once carried out the research of biochemical treatment to it, but because of operating cost is too high, complex treatment process and can't putting into production operation, and also a large amount of Inorganic Chemicals pours off in vain with water-white, is not only a kind of waste, and is a kind of pollution.
Acidified filtrate belongs to high organic concentration, high salinity acid waste water, and its solid content is 8-10%, and convection drying, cost are too high, if before further handling, the moisture in the filtrate is got rid of, the processing again and the utilization of filtrate are more convenient with making.
Using counter-infiltration (RO) method to carry out water treatment, to the impurity Selective Separation in the water body, is a kind of mature technique, is the method that can reach most economical in the 90%-99% removal of impurity.
The RO film can be carried out ion and gets rid of, and makes and has only water can pass through the RO film, and the ion that all the other are all and the molecule of dissolving all are trapped, and is got rid of (comprising salt and sugar).
The RO film is got rid of ion with charge reaction, and electrically charged bigger, removing property is higher, so the RO film almost can be got rid of all (＞99%) strong ionic high valence ion.
Because the wastewater flow rate that paper-making pulping produces is big, seriously polluted, after treatment, still has a lot of impurity, though can reach environment protectment protection, still there is various pollution in the discharging nature, even if utilize, also has a lot of restrictions again.Use the RO film to handle, ideal purification effect, but RO film itself needs constantly regeneration to handle and could continue to use because the accumulation of film surface contaminants causes the decline of service efficiency.
Therefore, to waste water, the especially acidified filtrate that paper-making pulping produces, need the constantly new processing and utilizing method of research.
Summary of the invention:
The object of the present invention is to provide a kind of acidified filtrate processing method of black liquid.
Another object of the present invention is to provide a kind of waterglass product that obtains by above-mentioned acidified filtrate processing method.
Acidified filtrate processing method of the present invention is: filtrate is added saccharomyces cerevisiae [Saccharomycescerevisiae Meyen ex Hansen] AS 2.23, kept 3-10 days down at 33-38 ℃, use the RO film to remove the moisture of 60-70%, obtain concentrate, in concentrate, add alkali, regulating the pH value is 6.5-7.0, dried makes the moisture of desciccate be controlled at 8-10%, adds quartz sand, the weight proportion of desciccate and quartz sand is 0.1-1, the modulus of mixture is controlled between the 2.5-3.4, after mixing, enters the calcining furnace calcining, obtain the sodium silicate solid product, i.e. the solid sodium silicate product.
So attitude waterglass can get liquid sodium silicate through steam-melting, i.e. the liquid glass product.
Above-mentionedly handle the moisture of the 60-70% remove through the RO film, water quality near or surpass raw water quality, the prospect of utilizing is again widely arranged.
Above-mentioned " modulus " is the special-purpose vocabulary of silicate industry, is meant SiO in the silicate product
2With Na
2The mol ratio of O.
Above-mentioned dried mode is preferably spray drying, as the pressure-type spray dryer, adopts natural gas as thermal source.
The adjusting of concentrate pH value is a critical step in the entire process process.Described alkali is NaOH, lime, preferred NaOH.Require the pH value to be controlled between the 6.5-7.0, the pH value is crossed to hang down and can be caused equipment corrosion.
Calcining furnace is that waterglass of the prior art is produced stove.When desciccate and quartz sand are 0.1-1 by weight ratio, the mixture modulus is to enter this stove after 2.5-3.4 mixes, and can produce NaSiO
3Product.
Paper-making pulping filtrate among the present invention is the paper-making pulping filtrate of raw material with wheat straw, straw preferably, especially adopts acid-precipitation method to handle the papermaking straw pulp filtrate of black liquor.
The inventive method is completely to the processing of acidified filtrate, and the part after Selective Separation is gone out to purify waste water is converted into solid-state sodium metasilicate, becomes useful industrial products, does not leave over any pollution problem.When having solved the industrial pollution problem, created economic benefit again, meet the industrial policy that country turns waste into wealth.Simultaneously, researcher of the present invention finds, before using the RO film to handle, filtrate is carried out microbiological treatment, to significant prolongation, filtrate are after treatment arranged in service life of RO film, more untreated filtrate has good filterability, there is obvious prolongation the RO film work period of using, on average prolongs 0.45 times, has tangible economic benefit.
Description of drawings:
Fig. 1 is the flow chart of the embodiment of the invention 1 processing method.
The specific embodiment:
Embodiment 1
The black liquor of papermaking straw pulp is handled the filtrate that obtains through acid out, add saccharomyces cerevisiae AS 2.23, kept 10 days down at 33 ℃, use RO membrane component (FR11-8040, Correspondent source company) handles, remove in the filtrate 65% moisture, add NaOH in the concentrate that obtains, regulating the pH value is 6.5, then with its dried in the pressure-type spray dryer, the moisture of gained desciccate is 8.5%, adds quartz sand according to 10% of desciccate weight, and the modulus of mixture is controlled at 2.5, after mixing, enter the calcining furnace calcining, obtain the solid sodium silicate product, this waterglass is colourless transparent glass body particle.
Embodiment 2
The black liquor of papermaking straw pulp is handled the filtrate that obtains through acid out, add saccharomyces cerevisiae AS 2.23, kept 3 days down at 38 ℃, use RO membrane component (FR21, Correspondent source company) handles, remove in the filtrate 70% moisture, add lime in the concentrate that obtains, regulating the pH value is 7.0, be heated oven dry then, the moisture of gained desciccate is 10%, adds quartz sand according to 60% of desciccate weight, and the modulus of mixture is controlled at 3.4, after mixing, enter the calcining furnace calcining, obtain the solid sodium silicate product, this waterglass is light-coloured transparent vitreum particle.
Embodiment 3
The black liquor of papermaking straw pulp is handled the filtrate that obtains through acid out, add saccharomyces cerevisiae AS 2.23, kept 7 days down at 35 ℃, use RO membrane component (FR21, Correspondent source company) handles, remove in the filtrate 60% moisture, add NaOH in the concentrate that obtains, regulating the pH value is 7.0, be heated oven dry then, when the moisture of gained desciccate is 10%, add quartz sand according to 40% of desciccate weight, the modulus of mixture is controlled at 3.0, after mixing, enter the calcining furnace calcining, obtain the solid sodium silicate product, this waterglass is colourless transparent glass body particle.
Comparative example 1
To directly use the work period of RO film processed to compare without microbiological treatment under work period of the employed RO film of embodiment 1-3 and the similarity condition, find three kinds relatively down, the work period of RO film prolongs 0.37 times, 0.39 times, 0.59 times respectively, and it is remarkable to promote efficient.
Claims (5)
1, a kind of acidified filtrate processing method of black liquid, it is characterized in that, filtrate is added saccharomyces cerevisiae AS 2.23, kept 3-10 days down at 33-38 ℃, use the RO film to remove the moisture of 60-70%, obtain concentrate, add alkali in concentrate, regulating the pH value is 6.5-7.0, dried, make the moisture of product be controlled at 8-10%, add quartz sand, the weight proportion of desciccate and quartz sand is 0.1-1, the modulus of mixture is controlled between the 2.5-3.4, after mixing, enter calcining furnace, preparation waterglass.
2, processing method according to claim 1 is characterized in that, described dried is spray drying or oven dry.
3, processing method according to claim 2 is characterized in that, described spray drying working pressure type spray dryer.
4, processing method according to claim 1 is characterized in that, described alkali is NaOH, lime.
5, processing method according to claim 4 is characterized in that, described alkali is NaOH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100580732A CN1300412C (en) | 2004-08-11 | 2004-08-11 | Acid separated filtrate treating method for paper-making black liquor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100580732A CN1300412C (en) | 2004-08-11 | 2004-08-11 | Acid separated filtrate treating method for paper-making black liquor |
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| Publication Number | Publication Date |
|---|---|
| CN1587507A true CN1587507A (en) | 2005-03-02 |
| CN1300412C CN1300412C (en) | 2007-02-14 |
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|---|---|---|---|
| CNB2004100580732A Expired - Fee Related CN1300412C (en) | 2004-08-11 | 2004-08-11 | Acid separated filtrate treating method for paper-making black liquor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106865892A (en) * | 2017-03-07 | 2017-06-20 | 轻工业环境保护研究所 | Reducing rules black liquor by wet method alkali reclaiming method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1105688C (en) * | 1998-12-08 | 2003-04-16 | 中国科学院化工冶金研究所 | Biological acid process for separating lignin from alkaline paper-making black liquor |
| CN1114011C (en) * | 2001-05-30 | 2003-07-09 | 潍坊学院 | Alkaline pulping process of wheel straw without drainage of black liquid |
| CN1421402A (en) * | 2001-11-30 | 2003-06-04 | 中国人民解放军军事医学科学院卫生学环境医学研究所 | Microbial prepn for treating paper-making effluent and microbe culturing method |
-
2004
- 2004-08-11 CN CNB2004100580732A patent/CN1300412C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106865892A (en) * | 2017-03-07 | 2017-06-20 | 轻工业环境保护研究所 | Reducing rules black liquor by wet method alkali reclaiming method |
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| CN1300412C (en) | 2007-02-14 |
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Granted publication date: 20070214 Termination date: 20100811 |