CN1276452A - Process for treating paper-making black liquor to obtain regenerated resource - Google Patents
Process for treating paper-making black liquor to obtain regenerated resource Download PDFInfo
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- CN1276452A CN1276452A CN 99107875 CN99107875A CN1276452A CN 1276452 A CN1276452 A CN 1276452A CN 99107875 CN99107875 CN 99107875 CN 99107875 A CN99107875 A CN 99107875A CN 1276452 A CN1276452 A CN 1276452A
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Abstract
A process for reclaiming paper-making black liquor includes filtering, homogenizing in pool, mixing it with chemical flocculant in pipeline by pump, adding floatage coagulant, filling aerated water to release and float-up the flocculated substance and collecting. Its advantages are high treating speed and flow, low cost, recovering all the sodium lignosulfonate, and reducing environmental pollution.
Description
The invention relates to a kind of processing method of sewage, further is about a kind of process for treating paper-making black liquor to obtain regenerated resource.
Along with the continuous development of national economy, the paper consumption of every profession and trade significantly increases, and China's timber resources lacks, and need the external market pulp board of a large amount of imports, and this pulpboard price is very expensive, so imbalance between supply and demand is becoming increasingly acute.What rise is the thousands of medium and small papermaking enterprise based on grass as raw material such as reed, straw, bamboo and straws of China thereupon, the waste water that these medium and small papermaking enterprises much produce papermaking is not aborning handled, but directly it is entered rivers and lakes.Because content of organics height, discharge capacity in the waste water are big, caused the severe contamination at local water source, and the paper waste of a lot of medium and small papermaking enterprises undressed one very important reasons be that the black liquor treatment technology of papermaking straw pulp is not broken through as yet, do not reach processing requirements, operating cost is too high, makes papermaking producer be difficult to accept.
Chinese patent CN-1037560 discloses a kind of administration of papermaking black liquid and application process, it utilizes aluminum sulfate and black liquid to carry out chemical reaction, separate out the aluminium lignin, but this method can only reach the purpose of comprehensive utilization, the waste water after the improvement is difficult to reach discharge standard.
The open CN-1044966 of Chinese patent discloses a kind of method of handling black liquid, this method comprises that elder generation adds calcium carbide in waste water or lime is handled with flocculating agents such as bittern or seawater again, follow bubbling air and flue gas in the gained supernatant again, after the Separation of Solid and Liquid, again supernatant is handled with sodium cellulosate and aluminum sulfate, last supernatant is again by activated carbon adsorption bed, but this method operation is more, equipment investment is big, operating cost is high.
At above problem, the method that the large enterprise that has adopts alkali to reclaim is administered black liquor pollution and has been obtained certain effect, but this technology has significant limitation, on the one hand, the equipment needed thereby complexity, investment is up to up to ten million units, and energy consumption is big, to the bad adaptability of medium-sized and small enterprises; On the other hand, from administering angle, fundamentally contaminated solution for example produces the secondary pulp washing and pollutes.Country is the improvement of the black liquid brainstorm project bid as the enforcement period of the seventh five-year plan, but up to now, still do not have a kind of invest little, administer the high method of return rate, this is a technical barrier that does not obtain satisfactorily resolving for a long time.
The object of the present invention is to provide and a kind ofly can satisfy medium and small papermaking sewage processing requirements, make the black liquor got rid of in the production etc. reach the relevant discharge standard of country, when reducing environmental pollution, conserve water resource, reducing operating cost, reclaim utility in the black liquor, comprise water, improve the treatment process of the straw paper making black liquor of pulp making of added value of product.
These and other objects of the present invention will and be described and further set forth by following detailed description.
In the present invention, process for treating paper-making black liquor to obtain regenerated resource comprises the steps:
A, black liquid is filtered the back with filter screen in balancing reservoir, carry out homogenizing;
B, with pump black liquor after inorganic or organic polymer chemical floc and the homogenizing is mixed in pipeline, rotary-cut enters the response analysis district, and pH value is 3～6;
C, liquid enter cohesion and enrichment region, add the flotation flocculating agent;
D, take off material district, discharge suspension process with the uninterruptedly floating water surface of going up of the extractable that has flocculated in the water by pressure air-dissolving water in suspension;
E, the emersion thing is scraped in the receiving vat with collector;
In the present invention, also comprise the steps:
A, receiving vat have adsorbent, and the absorption of the moisture content in the emersion thing, dehydration back are taken out;
B, liquid is again through behind the cascade filtration at least, reuse.
Further, addition inorganic or the organic polymer chemical floc is 0.2～0.8wt% of black liquor amount, and the addition of flotation flocculating agent is 0.2～0.8wt% of black liquor amount; Discharge in the suspension process at pressure air-dissolving water, water pressure is 3～4 atmospheric pressure, dissolves in the gas about 40%, and the sewage quantity of processing is 8: 1 with the ratio of the burst size of dissolved air water; The solid content of black liquor is greater than 8wt% in balancing reservoir, and the pipeline pressure that black liquor mixes in pipeline after inorganic or organic polymer chemical floc and the homogenizing is 3000rpm.
Technology of the present invention can realize by many existing equipments, the best patent application equipment that is to use applicant oneself application, and application number is 99211209, the applying date is: on May 25th, 99, exercise question is: a kind of paper-making black liquor to obtain regenerated resource automation equipment.
In the present invention, various alkaline process, acid system, imines method and lime method pulping by cooking waste liquid are discharged from the workshop, after through letter filter balancing reservoir, because the filter screen effect makes the thick assorted suspended matter of sneaking into obtain filtering, the concentration that simultaneously also makes waste liquid contain extractable obtains homogenizing and regulates, for the automation equipment reasonable disposition of hypomere operation, dosing and science operation provide condition, the waste liquid solid content after the homogenizing is being advisable more than 8%.
Because the character of extractable is different with purposes in the waste liquid, regulate the dosing control valve automatically in the ratio of measuring in advance, make soup enter the suction hose of sewage pump automatically, and realize that immediately the following pipeline pressure of 3000rpm mixes by the consumption of optimum response state.
The waste liquid that mixes through dosing enters the response analysis operation automatically by the pump discharge, because the effect of medicament makes the PH of waste liquid be adjusted to the optimum value 3～6 that extractable is separated out and tentatively condense naturally, forms the trickle suspended particulate of precipitate.
Coagulate body with the extractable of initial set by analysis and flow into the cohesion enrichment process automatically with waste liquid, under the effect of the cohesion concentrating agents that adds automatically in the ratio that preestablishes, extractable was promptly caught the colony of condensing more than the simmer down to diameter 2mm by net in 1～4 minute, and because medicament reaction forms a large amount of microbubbles is wrapped up in and take in the colony, produce big buoyancy and float automatically, reduced the hypomere air supporting operation waste liquid time of staying and dissolved air water burst size.
Extractable cohesion colony flows into air supporting rewinding operation with waste water, produce under the effect of aerosol with release floating certainly, can the above floating speed of per minute 20cm rise to liquid level, and further be condensed into the pie layer, be convenient to incessantly it be collected by the automatic material receiving device, the extractable colony that breaks away from waste liquid is generally resin-like flowable dope, and moisture is 5～10 times of dry products.
After the extractable of deviating from waste liquid flows into dehydration procedure automatically, owing to adopt water absorption to dewater naturally, generally transport the mill to can packing more than one hour at extraordinary water absorbing agent more than 100%; The absorbent of adsorbed water all direct reuse and because its very high colloid index, can strengthen the fineness and the intensity of paper in the paper pulp filler.
In the present invention, extractable is generally sodium lignin sulfonate, regeneration viscose, adhesive etc., and extracted amount is that every product ton paper institute's removal waste fluid (concentration is more than 10%) can extract 150～250 kilograms, purity about 75%.Processing clear liquid after extracting sodium lignin sulfonate etc., COD reduces to 1800ml/L, but the fully recovering pulping by cooking, also can directly produce becomes crude oil pour-point depressant etc.
It is fast that technology of the present invention has the black liquid of processing speed, flow big (investing more than 1.5 times of processing on an equal basis) for general technology, cost is low, can make and account for the sodium lignin sulfonate that pollutes more than 30% etc. in the black liquor and all separate out, and be condensed into the colony of diameter 3～10mm, but resource has been saved in all reuses of all the other materials, has reduced environmental pollution.
Below further specify the present invention by specific embodiment, but embodiment only be used for the explanation, can not limit the scope of the invention.
In the present invention, if not refer in particular to, all parts, amount are all based on the unit of weight of gross weight, and all raw materials comprise that equipment all can buy from market.
Example 1
The patent application equipment of request for utilization people oneself application, application number is 99211209, the applying date is: on May 25th, 99, exercise question is: a kind of paper-making black liquor to obtain regenerated resource automation equipment.
Discharge from the workshop with the alkaline cooking pulping waste liquor, after through letter filter balancing reservoir, because the filter screen effect makes the thick assorted suspended matter of sneaking into obtain filtering, the concentration that also makes waste liquid contain extractable simultaneously obtains homogenizing and regulates, and the waste liquid solid content after the homogenizing is being advisable more than 8%.Automatically regulate the dosing control valve in the ratio of measuring in advance, make soup enter the suction hose of sewage pump automatically by the consumption of optimum response state, and the pipeline pressure of realizing 2800rpm immediately mixes, the standard No. that soup described herein can adopt sea, Puyang extensive region, Henan Province peace and quiet aqua factory to produce is Q/PHJC-1998, and name is called high molecular aluminium-iron polymeric flocculant.The waste liquid that mixes through dosing enters the response analysis operation automatically by the pump discharge, because the effect of medicament makes the PH of waste liquid be adjusted to the optimum value 3～6 that extractable is separated out and tentatively condense naturally, forms the trickle suspended particulate of precipitate.Coagulate body with the extractable of initial set by analysis and flow into the cohesion enrichment process automatically with waste liquid, under the effect of the cohesion concentrating agents that automatically adds in the ratio that preestablishes (soup described herein can adopt that the applicant applies on the same day be entitled as a kind of flocculation aid and preparation method thereof), extractable was promptly caught the colony of condensing more than the simmer down to diameter 2mm by net in 1～4 minute, and because medicament reaction forms a large amount of microbubbles is wrapped up in and take in the colony, produce big buoyancy and float automatically, reduced the hypomere air supporting operation waste liquid time of staying and dissolved air water burst size.Extractable cohesion colony flows into air supporting rewinding operation with waste water, produce under the effect of aerosol with release floating certainly, rise to liquid level with the floating speed more than the per minute 20cm, and further be condensed into the pie layer, the extractable colony that breaks away from waste liquid is generally resin-like flowable dope, and moisture is 5～10 times of dry product.After the extractable of deviating from waste liquid flows into dehydration procedure automatically, adopt water absorption to dewater naturally, generally transport the mill to can packing more than one hour at extraordinary water absorbing agent more than 100%; The absorbent of adsorbed water all direct reuse and because its very high colloid index, can strengthen the fineness and the intensity of paper in the paper pulp filler.
In the present invention, extractable is generally sodium lignin sulfonate, regeneration viscose, adhesive etc., and extracted amount is that every product ton paper institute's removal waste fluid (concentration is more than 10%) can extract 150～250 kilograms, purity about 75%.Processing clear liquid after extracting sodium lignin sulfonate etc., COD reduces to 1800ml/L, but the fully recovering pulping by cooking, also can directly produce becomes crude oil pour-point depressant etc.
Claims (8)
1, a kind of process for treating paper-making black liquor to obtain regenerated resource is characterized in that comprising the steps:
A, black liquid is filtered the back with filter screen in balancing reservoir, carry out homogenizing;
B, with pump black liquor after inorganic or organic polymer chemical floc and the homogenizing is mixed in pipeline, rotary-cut enters the response analysis district, and pH value is 3～6;
C, liquid enter cohesion and enrichment region, add the flotation flocculating agent;
D, take off material district, discharge suspension process with the uninterruptedly floating water surface of going up of the extractable that has flocculated in the water by pressure air-dissolving water in suspension;
E, the emersion thing is scraped in the receiving vat with collector;
2, process for treating paper-making black liquor to obtain regenerated resource as claimed in claim 1 is characterized in that also comprising the steps:
A, receiving vat have adsorbent, and the absorption of the moisture content in the emersion thing, dehydration back are taken out;
B, liquid is again through behind the cascade filtration at least, reuse.
3, as claim 1,2 described process for treating paper-making black liquor to obtain regenerated resource, the addition that it is characterized in that inorganic or organic polymer chemical floc is 0.2～0.8wt% of black liquor amount.
4, as claim 1,2 described process for treating paper-making black liquor to obtain regenerated resource, the addition that it is characterized in that the flotation flocculating agent is 0.2～0.8wt% of black liquor amount.
5, as claim 1,2 described process for treating paper-making black liquor to obtain regenerated resource, it is characterized in that discharging in the suspension process at pressure air-dissolving water, water pressure is 3～4 atmospheric pressure, dissolves in 40% gas.
6, process for treating paper-making black liquor to obtain regenerated resource as claimed in claim 5 is characterized in that discharging in the suspension process at pressure air-dissolving water, and the sewage quantity of processing is 8: 1 with the ratio of the burst size of dissolved air water.
7, as claim 1,2 described process for treating paper-making black liquor to obtain regenerated resource, the solid content that it is characterized in that black liquor in balancing reservoir is greater than 8wt%.
8,, it is characterized in that the pipeline pressure that black liquor mixes after inorganic or organic polymer chemical floc and the homogenizing is 3000rpm in pipeline as claim 1,2 described process for treating paper-making black liquor to obtain regenerated resource.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99107875 CN1276452A (en) | 1999-06-04 | 1999-06-04 | Process for treating paper-making black liquor to obtain regenerated resource |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99107875 CN1276452A (en) | 1999-06-04 | 1999-06-04 | Process for treating paper-making black liquor to obtain regenerated resource |
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| CN1276452A true CN1276452A (en) | 2000-12-13 |
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| CN 99107875 Pending CN1276452A (en) | 1999-06-04 | 1999-06-04 | Process for treating paper-making black liquor to obtain regenerated resource |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891353A (en) * | 2010-07-23 | 2010-11-24 | 福建铙山纸业集团有限公司 | Advanced treatment method for papermaking waste water |
| CN102140261A (en) * | 2011-01-18 | 2011-08-03 | 延边石岘白麓纸业股份有限公司 | Method for preparing dye dispersing agent based on sulfite pulping waste liquid and dye combination |
| CN107117705A (en) * | 2017-07-05 | 2017-09-01 | 南京乐翼环境科技有限公司 | A kind of high load capacity biology aerobic oxidative system |
| CN108049229A (en) * | 2017-12-08 | 2018-05-18 | 齐鲁工业大学 | A kind of environment-protecting clean pulping process |
-
1999
- 1999-06-04 CN CN 99107875 patent/CN1276452A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891353A (en) * | 2010-07-23 | 2010-11-24 | 福建铙山纸业集团有限公司 | Advanced treatment method for papermaking waste water |
| CN102140261A (en) * | 2011-01-18 | 2011-08-03 | 延边石岘白麓纸业股份有限公司 | Method for preparing dye dispersing agent based on sulfite pulping waste liquid and dye combination |
| CN107117705A (en) * | 2017-07-05 | 2017-09-01 | 南京乐翼环境科技有限公司 | A kind of high load capacity biology aerobic oxidative system |
| CN108049229A (en) * | 2017-12-08 | 2018-05-18 | 齐鲁工业大学 | A kind of environment-protecting clean pulping process |
| CN108049229B (en) * | 2017-12-08 | 2019-04-19 | 齐鲁工业大学 | A kind of environment-protecting clean pulping process |
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