CN102372409A - Treatment method of paper pulp biological sludge - Google Patents
Treatment method of paper pulp biological sludge Download PDFInfo
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- CN102372409A CN102372409A CN2011103117723A CN201110311772A CN102372409A CN 102372409 A CN102372409 A CN 102372409A CN 2011103117723 A CN2011103117723 A CN 2011103117723A CN 201110311772 A CN201110311772 A CN 201110311772A CN 102372409 A CN102372409 A CN 102372409A
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- biological sludge
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- paper pulp
- sludge
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- 239000010802 sludge Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000011282 treatment Methods 0.000 title claims abstract description 17
- 229920001131 Pulp (paper) Polymers 0.000 title abstract description 9
- 238000001704 evaporation Methods 0.000 claims abstract description 12
- 230000008020 evaporation Effects 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000009993 causticizing Methods 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 11
- 230000018044 dehydration Effects 0.000 claims description 8
- 238000006297 dehydration reaction Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002562 thickening agent Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000010248 power generation Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 238000009955 starching Methods 0.000 claims description 2
- 239000003513 alkali Substances 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000007787 solid Substances 0.000 abstract description 6
- 230000005611 electricity Effects 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000015271 coagulation Effects 0.000 abstract 1
- 238000005345 coagulation Methods 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 9
- 208000005156 Dehydration Diseases 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000003245 coal Substances 0.000 description 5
- 239000012141 concentrate Substances 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010411 cooking Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 238000005352 clarification Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 229910021653 sulphate ion Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 239000002361 compost Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 241000202567 Fatsia japonica Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000011284 combination treatment Methods 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 235000012204 lemonade/lime carbonate Nutrition 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 208000016261 weight loss Diseases 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
Abstract
The invention relates to a treatment method of paper pulp biological sludge. According to the method, the paper pulp biological sludge is successively subjected to the following steps of collecting biological sludge and carrying out auxiliary coagulation, pre-dewatering and separating, preheating and then mixing with a back liquid for multiple-effect evaporation and carrying out super concentration and evaporation on biological sludge-back liquid, and finally mixing and burning in an alkali furnace for generating electricity and supplying heat, and causticizing fusant and then recycling the causticized fusant. According to the invention, solid biological sludge wastes are turned to wealth, so that a pulp plant reaches zero emission, thereby achieving clean production and energy saving and emission reduction, reducing garbage landfill and being beneficial to development of circulating economy. The method has novel technology and achieves a 3R (reduce, reuse and recycle) target initiated by international clean production.
Description
Technical field
The present invention relates to field of environment protection, particularly a kind of treatment process of starching the paper biological sludge.
Background technology
At present, the WWT of bleached sulphate wood pulp factory both at home and abroad, the primary sludge of generation and biochemical treatment mud overwhelming majority producer adopt mixes landfill disposal or a small amount of sludge composting utilization, causes a large amount of land occupations inevitably even produces secondary pollution.
According to Chinese papermaking association statistics, Chinese paper in 2010 and 9,270 ten thousand tons of cardboard ultimate productions, 9,173 ten thousand tons of consumption, ten thousand tons of the wet about 900-1000 of mud of the residue that the whole industry produces.Raising along with the national economic development and living standards of the people and quality; The volume of production and marketing of slurry paper is also with increasing; Requirement to peripheral living environment is also increasingly high, and country carries out strict limit batch to newly-built refuse landfill, and the shared ratio of mud landfill disposal will significantly reduce from now on.Therefore hold water, treatment and disposal mud problem scientifically, be the burdensome task of pendulum in face of ours, and key be sludge water content lower, mass dryness fraction brings up on the economic calorific value.
The purpose of sludge treatment is to reach minimizing, stabilization, innoxious and resource utilization.More sophisticated at present method for sludge treatment has landfill, compost and burning etc.
Landfill: adopt direct processing cost low.Its shortcoming is poisonous and harmful heavy metallic and pathogenic micro-organism meeting contaminated land and the water resources that takies in a large amount of soils, the mud, and the construction of landfill yard, use are limited by geology, the hydrology and edaphic condition.
Compost: the organism in the mud is carried out biochemical degradation, make it to be converted into performance, the increase soil fertility of stable soil ulmin to improve soil.Though this method has certain economic and social benefit, treatment capacity, cost are restricted by the downstream agriculture, forestry, animal husbandry, fisheries to a great extent, can't fundamentally digest, thoroughly solve the problem of outlet of mud.
Burn: adopt sludge drying or deep dehydration technology, make the combustiblecomponents fully burning at high temperature comparatively economically in the mud, finally become stable lime-ash.Burning method has that to subtract appearance, weight-loss ratio high, and processing speed is fast, and is innoxious more thorough, and waste heat can be used for advantages such as generating or heat supply.In recent years, burning method has adopted appropriate pretreatment technology and advanced incinerating method, has satisfied more and more stricter environmental requirement, is current method for sludge treatment preferably.
As stated, present domestic ectoplasm paper plant is generally with the residue biological sludge of WWT, three grades of decolouring chemical sludges and primary sludge mixed dehydrations, outward transport landfill.Extremely indivedual burnings also are to burn at coal firing boiler, rarely have the processing of branch matter, biological sludge in alkali stove burning electricity generation case or technology.Biological sludge contains large amount of organic, thickness, is difficult to deep dehydration; So combination treatment landfill; Only can increase extra a large amount of freight charges, burning needs extra fuel to dewater, the Technological Economy difficulty is very big, also do not have both at home and abroad at present can steady running slurry paper sludge incineration device.
Bleached sulphate wood pulp factory, change machine slurry factory on a large scale; Generally be furnished with power boiler, alkali recovery boiler; This is that deeply dehydrating sludge, multifuel combustion generating provide better economic to burn the type of furnace, and all possesses the economic basic fuel that burns: coal, alkali reclaim ultra concentrated black liquid.This provides scientific and reasonable cleaner production basic condition for research and development deeply dehydrating sludge, multifuel combustion power generation assembly.
Black liquor is in sulphate process or the caustic soda legal system pulping process; The washings of the paper pulp after the washing boiling; Its black in color wherein contains inorganics and lignin, semicellulose and the cellulosic degraded product and the organic acid etc. of stripping from plant fiber material in the cooking liquor.Inorganics comprise free sodium hydroxide, sodium sulfate, sodium sulphite, yellow soda ash and with organism bonded sodium, silicon-dioxide etc.Black liquor directly enters rivers and can pollute, and should handle.Treatment process is first evaporation concentration, again through burning, recyclable soda ash.The heat that burning generates reclaims with vapor form.Most of inorganics becomes molten state in combustion processes, the dissolving back green liquor (green liquor).Green liquor becomes white liquid (white liquor) through the milk of lime causticization after the clarification, can be used for preparing cooking liquor system paper pulp.Be precipitated as lime carbonate (paper industry is called white clay) after the white liquid clarification.
Summary of the invention
The treatment process that the purpose of this invention is to provide a kind of low in the pollution of the environment, energy-saving and emission-reduction, high-quality and efficient slurry paper biological sludge.
The present invention adopts following technical scheme for solving its technical problem:
Step of the present invention is following:
(1) in the biological sludge of collecting, add flocculant aid, its mass concentration in biological sludge is 1～3ppm;
(2) will pass through the separation of dewatering in advance of biological sludge that step (1) handles, and make the massfraction of its dry substance reach 10%～15%;
(3) will pass through (2) step in advance the isolating biological sludge of dehydration be preheated to after 110-125 ℃ with slurry paper production process in the black liquor massfraction that mixes evaporation concentration to its dry substance reach more than 70%;
(4) massfraction that the mixture that makes of (3) step is continued to be concentrated into its dry substance reaches more than 80%;
(5) burning (4) goes on foot the mixture that makes, and the superheated vapour of generation is used for power generation and heat supply, and the melts after the dissolving burning obtains white liquid behind causticizing reaction.
Flocculant aid is a molecular weight greater than 1,000 ten thousand cationic polyacrylamide in the step (1).
Use the separating centrifuge separation of dewatering in advance in the step (2), the main frame rotary drum power of separating centrifuge is that 75KW, specified speed are 3000rpm.。
Use thickener to carry out concentration in the step (4), the hydraulic fluid side service temperature of used thickener is 160～200 ℃, and the heated side heating steam pressure is 5～12bar, and temperature is 200～250 ℃.
Positively effect of the present invention is following:
It is organic that biological sludge belongs to, and has certain calorific value after concentrating, and after black liquor mixes, is good fuel, therefore utilizes the inventive method to need not mud is transported outward landfill, reduced environmental pollution and processing cost.The inventive method will be starched the paper biological sludge at first through coagulant aids flocculation, dehydration concentrates, mixes with black liquor and carry out multiple-effect evaporation and then through super concentration and evaporation, carry out the burning of alkali stove at last in advance; Steam is used for power generation and heat supply; Carry out causticizing reaction after the melts dissolving and obtain white liquid, can be used to prepare cooking liquor system paper pulp.The present invention gives up biological sludge admittedly turns waste into wealth, and makes slurry factory reach zero release, has realized cleaner production, energy-saving and emission-reduction, has reduced garbage loading embeading, helps developing a circular economy.Technology is novel, can reach the 3R target that international cleaner production advocates (Reduce, Reuse, Recycle).
Use the inventive method can produce 18.75 tons/day in the mud (folding over dry ton 15t/d) that contains dry substance 80%; Ultra dense biological sludge conversion calorific value is 7.5MJ/kg (the ultra concentrated black liquid of slurrying is converted calorific value 13.3 MJ/kg separately); Practice thrift mark coal 4.8t/d (mark coal calorific value 29.306 MJ/kg) day, steam 44.16 tons, 1.23 ten thousand degree generate electricity; Amount to 1680 tons in year feast-brand mark coal, year generating 430.77 ten thousand degree.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method.
Embodiment
Below in conjunction with specific embodiment the inventive method is detailed.
The inventive method step is following:
(1) collects the residue biological sludge that slurry factory sewage works secondary biochemical aerating system produces; Its dry solids content is 2～3% (massfraction that is dry substance is 2～3%); Carry (15L/s) through spiral pump, to the storage tank (60m of biological sludge advanced treatment workshop section between the alkali recovery vehicle
3The concrete pond).In storage tank, add molecular weight greater than 1,000 ten thousand cationic polyacrylamide as flocculant aid, model be inferior assorted blue 268C, dilution afterwards flocculant aid mass concentration in mud is 1～3ppm.
(2) will go up biological sludge that the step collects in advance dehydration concentrate, make that its dry solids content is 10%～15% after the preparatory dehydration.Equipment therefor is a kind of spiral shell sedimentation separating centrifuge for sleeping in, and its characteristic parameter is: main frame rotary drum power is 75KW, specified speed 3000rpm, and spiral conveyer is through the relative rotation speed 1～12rpm of differential mechanism and rotary drum.Device is the operation of the Equidirectional type of end charging, and the solid-liquid miscellany gets into and do not separate immediately behind the whizzer but behind same axial direction due displacement one segment distance, clear liquor is arranged by thrust-augmenting nozzle, and the Equidirectional type operation is used for the preliminary of biological sludge and concentrates.Differential between rotary drum and the spiral conveyer adopts reliably two variable frequency adjustment machinery differential gears, 0.05 rev/min of differential sharpness of regulation value.Two variable frequency adjustment machinery differential gears can be regulated differential automatically through the thickness of mud layer in the whizzer, reach automatic adjusting moment of torsion.
(3) biological sludge that will go up after the step concentrates is preheating to 110 ℃, mixes with black liquor and carries out multiple-effect evaporation, reaches 70% until the content of the dry substance of mixed solution.Preheating unit is the biological sludge well heater, and specification is ∮ 840 * 1000,620Kw, heat interchanging area 41.28m
2, 110 ℃ of service temperatures, working pressure 1.43bar; Multiple-effect evaporation adopts six to imitate biological sludge-black liquor mixing evaporation.The device that adopts is the sextuple-effect evaporation unit, and steam output is 1000t/h, has a daily output of 4420tDS/d, and the dry solids content after the evaporation reaches 70%～75%.
(4) will go up the mixture that obtains of step and continue in super thickener (Super Concentrator:1SCO+S01), to concentrate, reach more than 80% until dry solids content.Thickener hydraulic fluid side service temperature is 160～200 ℃, and the heated side heating steam pressure is 5～12bar, and temperature is 200～250 ℃.
(5) will go up the mixture that obtains of step and in the alkali stove, spray burnings, the generation superheated vapour is through turbine drive generator for electricity generation.Most of inorganics becomes molten state in combustion processes, the dissolving back green liquor, green liquor becomes white liquid through the milk of lime causticization after the clarification, can be used for preparing cooking liquor system paper pulp.Used alkali stove day burning alkali reclaims solid substance 6500～7000tDS/d, and superheat steam temperature is 480 ℃, and flow velocity is 285kg/s, and pressure is 84bar.
Technique scheme has only embodied optimal technical scheme of the present invention, the technician in present technique field to some part wherein some changes that possibly make all embodied principle of the present invention, belong within protection scope of the present invention.
Claims (4)
1. treatment process of starching the paper biological sludge is characterized in that its step is following:
(1) in the biological sludge of collecting, add flocculant aid, its mass concentration in biological sludge is 1～3ppm;
(2) will pass through the separation of dewatering in advance of biological sludge that step (1) handles, and make the massfraction of its dry substance reach 10%～15%;
(3) will pass through (2) step in advance the isolating biological sludge of dehydration be preheated to after 110-125 ℃ with slurry paper production process in the black liquor massfraction that mixes evaporation concentration to its dry substance reach more than 70%;
(4) massfraction that the mixture that makes of (3) step is continued to be concentrated into its dry substance reaches more than 80%;
(5) burning (4) goes on foot the mixture that makes, and the superheated vapour of generation is used for power generation and heat supply, and the melts after the dissolving burning obtains white liquid behind causticizing reaction.
2. the treatment process of slurry paper biological sludge according to claim 1 is characterized in that flocculant aid in the step (1) is a molecular weight greater than 1,000 ten thousand cationic polyacrylamide.
3. the treatment process of slurry paper biological sludge according to claim 1 is characterized in that using in the step (2) the separating centrifuge separation of dewatering in advance, and the main frame rotary drum power of separating centrifuge is that 75KW, specified speed are 3000rpm.
4. the treatment process of slurry paper biological sludge according to claim 1; It is characterized in that using in the step (4) thickener to carry out concentration; The hydraulic fluid side service temperature of used thickener is 160～200 ℃, and the heated side heating steam pressure is 5～12bar, and temperature is 200～250 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110311772 CN102372409B (en) | 2011-09-27 | 2011-09-27 | Treatment method of paper pulp biological sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110311772 CN102372409B (en) | 2011-09-27 | 2011-09-27 | Treatment method of paper pulp biological sludge |
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| Publication Number | Publication Date |
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| CN102372409A true CN102372409A (en) | 2012-03-14 |
| CN102372409B CN102372409B (en) | 2013-06-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102874769A (en) * | 2012-10-09 | 2013-01-16 | 广西大学 | Method and device for oxidative conversion of sodium sulfide in alkali fusant |
| CN109279758A (en) * | 2018-11-21 | 2019-01-29 | 湖南骏泰新材料科技有限责任公司 | A kind of green mud high-efficient washing method |
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| US20060201641A1 (en) * | 2001-08-07 | 2006-09-14 | Bioregional Minimills (Uk) Limited | Methods for producing pulp and treating black liquor |
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| CN101775750A (en) * | 2010-01-22 | 2010-07-14 | 葛文宇 | A clear pulp production process for realizing complete comprehensive utilization and removing three wastes |
| CN101935142A (en) * | 2010-07-15 | 2011-01-05 | 东莞地龙纸业有限公司 | Dehydration method for waste paper paper-making sludge |
| CN102001812A (en) * | 2010-11-22 | 2011-04-06 | 杭州苏堤环保实业有限公司 | Deep sludge dewatering process |
| CN102079615A (en) * | 2010-12-21 | 2011-06-01 | 湖南骏泰浆纸有限责任公司 | Method for harmlessly recycling sludge |
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Patent Citations (6)
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| US20060201641A1 (en) * | 2001-08-07 | 2006-09-14 | Bioregional Minimills (Uk) Limited | Methods for producing pulp and treating black liquor |
| WO2007060379A1 (en) * | 2005-11-28 | 2007-05-31 | Gilbert Fleming | Sewage sludge treatment method |
| CN101775750A (en) * | 2010-01-22 | 2010-07-14 | 葛文宇 | A clear pulp production process for realizing complete comprehensive utilization and removing three wastes |
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| CN102874769A (en) * | 2012-10-09 | 2013-01-16 | 广西大学 | Method and device for oxidative conversion of sodium sulfide in alkali fusant |
| CN109279758A (en) * | 2018-11-21 | 2019-01-29 | 湖南骏泰新材料科技有限责任公司 | A kind of green mud high-efficient washing method |
| CN109279758B (en) * | 2018-11-21 | 2021-08-10 | 湖南骏泰新材料科技有限责任公司 | Efficient green mud washing method |
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| CN102372409B (en) | 2013-06-26 |
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| C56 | Change in the name or address of the patentee |
Owner name: YATAI SENBO (SHANDONG) PULP PAPER CO., LTD. Free format text: FORMER NAME: SHANDONG YATAI SENBO PULP PAPER CO., LTD. |
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| CP03 | Change of name, title or address |
Address after: 276826 No. 369, Beijing Road, Shandong, Rizhao City Patentee after: ASIA SYMBOL (SHANDONG) PULP AND PAPER Co.,Ltd. Address before: 276800 Beijing Road, Rizhao City Economic Development Zone, Shandong, No. 369 Patentee before: SHANDONG YATAI SENBO PULP PAPER Co.,Ltd. |
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Denomination of invention: The treatment method of pulp and paper biological sludge Effective date of registration: 20231211 Granted publication date: 20130626 Pledgee: Rizhao Bank Co.,Ltd. Pledgor: ASIA SYMBOL (SHANDONG) PULP AND PAPER Co.,Ltd. Registration number: Y2023980070566 |