CN101234833A - Straw pulping paper-making or sulfite method pulping paper-making middle piece waste water treatment technique - Google Patents
Straw pulping paper-making or sulfite method pulping paper-making middle piece waste water treatment technique Download PDFInfo
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- CN101234833A CN101234833A CNA2008100491915A CN200810049191A CN101234833A CN 101234833 A CN101234833 A CN 101234833A CN A2008100491915 A CNA2008100491915 A CN A2008100491915A CN 200810049191 A CN200810049191 A CN 200810049191A CN 101234833 A CN101234833 A CN 101234833A
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Abstract
The invention discloses a technology for processing wastewater in middle section of wheat straw cleaning pulping papermaking or sulfite process pulping papermaking. The technology carries out pretreatment to the wastewater of the middle section of the pulping papermaking, which comprises the processes: precipitant with calcium is selected and added in the wastewater of the middle section before the wastewater of the middle section is biochemistry processed; firstly, sulfite ion in the wastewater is removed so that the content of the sulfite ion in the wastewater is reduced; then the biochemistry processing is carried out. The technology for processing wastewater in middle section of wheat straw cleaning pulping papermaking or sulfite process pulping papermaking is economically feasible, uses waste to control waste, is suiting for national environmental policy and has a good application value for popularizing.
Description
Technical field
The present invention relates to pulp and paper effluent treatment technology, relate in particular to papermaking of wheat straw cleaning pulping or sulfite method pulping paper-making middle-stage wastewater treatment process.
Background technology
Sulfite method pulping paper-making is the normally used method of paper industry, and at present domestic quite a few is arranged is that is still using in the paper mill of raw material with the grass.The sulfite ion that contains a great deal of in the middle-stage wastewater that this method produces, sulfite ion suppresses the activity of bacterium, and biochemical treatment efficient is reduced, even makes that biochemical reaction can't carry out, active sludge disintegrates, and influences the biochemical treatment of its waste water; Sulfite ion oxygen consumption meanwhile, every kilogram of oxygen-consumption is 0.2kg, and following reaction: 2SO takes place
3 2-+ O
2→ 2SO
4 2-, the result make after the processing to efflux the water chemistry oxygen-consumption higher, " paper industry pollution discharge standard GB3544-2001 " requirement is difficult to be up to state standards.Requirement according to national standard " paper industry pollution discharge standard GB3544-2001 ": outer draining main polluted factors---chemical oxygen demand (CODcr) is difficult to satisfy the requirement more and more high to environment protection of the friendly type society of constructing environment less than 400mg/L.For this reason, be badly in need of at present this pulping process is improved, reduce the middle section water pollution load, to satisfy qualified discharge.
Summary of the invention
The object of the invention is sulfite method pulping paper-making technology is improved, and process modification is carried out in the stage casing wastewater treatment, reduces the middle section water pollution load, satisfying qualified discharge, and is equally applicable to the wheat straw clean pulping process.
For realizing the object of the invention, technical scheme is as follows:
This technology is carried out pre-treatment earlier to pulping paper-making medium wastewater, promptly selects for use calcareous precipitation agent before the middle-stage wastewater biochemical treatment, adds in the middle-stage wastewater, removes the sulfite ion in the waste water earlier, and the sulfite ion content in the waste water is reduced; And then carry out follow-up biochemical treatment, and the chemical oxygen demand of outer draining after the biochemical treatment is reduced, satisfy qualified discharge, the calcium sulfite of generation enters sludge treating system by the settling tank post precipitation and handles.Selected calcic precipitation agent is the material of calcium ions, barium ion, can react with sulfite ion, generates the sediment that is insoluble in water.Consider economical rationality, mainly select for use: calcium hydroxide, unslaked lime, calcium carbide route are produced the waste (being commonly called as calcium carbide mud) of acetylene or are produced the waste of Losantin bleaching liquor.Its add-on is that every cubic metre of waste water adds 0.5-6kg.Technical essential is: utilize Ca
2+With SO
3 2-Precipitin reaction generate the very little calcium sulfite of precipitation solubility product and remove sulfite ion in the waste water, be beneficial to the carrying out of follow-up middle-stage wastewater biochemical treatment.
The invention has the advantages that, at first pulping paper-making medium wastewater has been carried out pre-treatment, reduced the sulfite ion content in the waste water, test shows: add the precipitation agent of calcium ions in containing the middle-stage wastewater of sulfite ion, the SO in the waste water
3 2-Can be reduced to below the 120mg/L by 700mg/L, can eliminate SO well
3 2-To the influence of paper waste biochemical treatment bacterial activity, reduce in the water pollution load, and be beneficial to the carrying out of follow-up biochemical treatment, make the chemical oxygen demand reduction of outer draining after the biochemical treatment, satisfy qualified discharge; The method economically feasible, the treatment of wastes with processes of wastes against one another, very environmental protection meets the national environmental protection policy, has application value preferably.
Embodiment
For the present invention is better illustrated, as follows for embodiment:
Embodiment 1
Unslaked lime metering back is dropped in the digester, be added to water collecting basin by every cubic metre of waste water 2kg amount, the calcium sulfite of generation enters sludge treating system by the settling tank post precipitation and handles, and after this middle-stage wastewater carries out follow-up biochemical treatment.
Embodiment 2
To put in the digester after calcium carbide mud (mass dryness fraction 40%) metering, be added in the digestion pool by every cubic metre of waste water 3kg amount, the calcium sulfite of generation enters sludge treating system by the settling tank post precipitation and handles, and after this middle-stage wastewater carries out follow-up biochemical treatment.
Embodiment 3
To put in the digester after bleaching liquor slag (mass dryness fraction 50%) metering, be added in the water collecting basin by every cubic metre of waste water 6kg amount, the calcium sulfite of generation enters sludge treating system by the settling tank post precipitation and handles, and after this middle-stage wastewater carries out follow-up biochemical treatment.
Embodiment 4
Put in the digester after lime, calcium carbide mud, bleaching liquor slag measured in proportion, be added in the water collecting basin by every cubic metre of waste water 2.5-4kg amount, the calcium sulfite that produces enters sludge treating system by the settling tank post precipitation and handles, and after this middle-stage wastewater carries out follow-up biochemical treatment.
Show through experiment test: in sulphite salt method pulping and paper-making and cleaning pulping papermaking midcourse wastewater, after adding the 0.5-6kg precipitation agent, sulfite ion concentration in the waste water can be reduced to 120mg/L, the carrying out of follow-up biochemical treatment and the chemical oxygen demand of reduction place draining have been played good effect, improve the efflux wastewater after the middle-stage wastewater biochemical treatment in the technology at this, reach the statutory requirement of national GB3544-2001 standard.Detailed data sees the following form:
| The precipitation agent title | Add point | Add-on Kg/m 3 kindsMiddle-stage wastewater | Water inlet SO 3 2-Concentration mg/L | Water outlet SO 3 2-Concentration Mg/L | Chemical oxygen demand clearance % before and after handling | SO 3 2-Clearance % | Cost unit/water/ton |
| Unslaked lime | Before the primary sedimentation basin | 0.5 | 611 | 118 | 79 | 81 | 0.07 |
| 3.0 | 647 | 106 | 80 | 84 | 0.45 | ||
| 6.0 | 684 | 94 | 84 | 86 | 0.90 | ||
| Calcium carbide mud | Before the primary sedimentation basin | 0.5 | 611 | 107 | 79 | 82 | 0.02 |
| 3.0 | 647 | 103 | 80 | 84 | 0.12 | ||
| 6.0 | 684 | 98 | 85 | 86 | 0.24 | ||
| Float body refuse | Before the primary sedimentation basin | 0.5 | 611 | 137 | 77 | 78 | 0 |
| 3.0 | 647 | 80 | 78 | 76 | 0 | ||
| 6.0 | 684 | 114 | 79 | 83 | 0 |
Claims (3)
1, straw pulping paper-making or sulfite method pulping paper-making middle-stage wastewater treatment process, adopt biochemical process that it is handled, it is characterized in that, pulping paper-making medium wastewater is carried out pre-treatment earlier, promptly select for use calcareous precipitation agent before the middle-stage wastewater biochemical treatment, to add in the middle-stage wastewater, remove the sulfite ion in the waste water earlier, the sulfite ion content in the waste water is reduced; And then carry out biochemical treatment.
2, straw pulping paper-making as claimed in claim 1 or sulfite method pulping paper-making middle-stage wastewater treatment process, it is characterized in that precipitation agent is the waste of calcium hydroxide, unslaked lime, calcium carbide route production acetylene or waste or its mixture of producing the Losantin bleaching liquor.
3, straw pulping paper-making as claimed in claim 1 or sulfite method pulping paper-making middle-stage wastewater treatment process is characterized in that, every cubic metre of pulping paper-making medium wastewater adds 0.5----6kg pre-treatment precipitation agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100491915A CN101234833A (en) | 2008-01-31 | 2008-01-31 | Straw pulping paper-making or sulfite method pulping paper-making middle piece waste water treatment technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100491915A CN101234833A (en) | 2008-01-31 | 2008-01-31 | Straw pulping paper-making or sulfite method pulping paper-making middle piece waste water treatment technique |
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| Publication Number | Publication Date |
|---|---|
| CN101234833A true CN101234833A (en) | 2008-08-06 |
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|---|---|---|---|
| CNA2008100491915A Pending CN101234833A (en) | 2008-01-31 | 2008-01-31 | Straw pulping paper-making or sulfite method pulping paper-making middle piece waste water treatment technique |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796577A (en) * | 2011-11-16 | 2012-11-28 | 山东省农业科学院农业资源与环境研究所 | Method for producing methane by utilizing papermaking black liquid caused by ammonium sulfite method |
-
2008
- 2008-01-31 CN CNA2008100491915A patent/CN101234833A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796577A (en) * | 2011-11-16 | 2012-11-28 | 山东省农业科学院农业资源与环境研究所 | Method for producing methane by utilizing papermaking black liquid caused by ammonium sulfite method |
| CN102796577B (en) * | 2011-11-16 | 2014-01-08 | 山东省农业科学院农业资源与环境研究所 | Method for producing methane by utilizing papermaking black liquid caused by ammonium sulfite method |
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Open date: 20080806 |