CN102372409B - Treatment method of paper pulp biological sludge - Google Patents
Treatment method of paper pulp biological sludge Download PDFInfo
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- CN102372409B CN102372409B CN 201110311772 CN201110311772A CN102372409B CN 102372409 B CN102372409 B CN 102372409B CN 201110311772 CN201110311772 CN 201110311772 CN 201110311772 A CN201110311772 A CN 201110311772A CN 102372409 B CN102372409 B CN 102372409B
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- 239000010802 sludge Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000011282 treatment Methods 0.000 title claims abstract description 16
- 229920001131 Pulp (paper) Polymers 0.000 title claims 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
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 14
- 239000002002 slurry Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 238000010411 cooking Methods 0.000 claims description 6
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 6
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 6
- 239000002562 thickening agent Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 238000005352 clarification Methods 0.000 claims description 5
- 238000010248 power generation Methods 0.000 claims description 4
- 235000017550 sodium carbonate Nutrition 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 229920002488 Hemicellulose Polymers 0.000 claims description 3
- 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 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 3
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 239000002657 fibrous material Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229920005610 lignin Polymers 0.000 claims description 3
- 150000007524 organic acids Chemical class 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 238000004537 pulping Methods 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229960001866 silicon dioxide Drugs 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 235000010265 sodium sulphite Nutrition 0.000 claims description 3
- 238000009955 starching Methods 0.000 claims description 3
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 3
- 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 3
- 238000009993 causticizing Methods 0.000 abstract description 2
- 238000011161 development Methods 0.000 abstract description 2
- 239000010813 municipal solid waste Substances 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
- 239000003245 coal Substances 0.000 description 5
- 239000002689 soil Substances 0.000 description 4
- 208000005156 Dehydration Diseases 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 235000011609 Pinus massoniana Nutrition 0.000 description 2
- 241000018650 Pinus massoniana Species 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002361 compost Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 241000202567 Fatsia japonica Species 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 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
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- 239000012895 dilution Substances 0.000 description 1
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- 238000001035 drying Methods 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
- 238000010304 firing Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 239000011259 mixed solution Substances 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
- 238000002360 preparation method 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
- 239000002910 solid waste Substances 0.000 description 1
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- 239000007921 spray Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 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
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Classifications
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- 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 andemission 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 for the treatment of process of starching the paper biological sludge.
Background technology
At present, the sewage disposal of masson pine factory both at home and abroad, the primary sludge of generation and biochemical treatment mud overwhelming majority producers adopt mixes landfill disposal or a small amount of sludge composting utilization, inevitably causes a large amount of land occupations, 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, the wet mud of the residue that the whole industry produces is ten thousand tons of 900-1000 approximately.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 more and more higher, and country carries out strict limit batch to newly-built refuse landfill, and Sludge landfill is processed shared ratio and will be greatly reduced from now on.Therefore holding water, scientifically process the disposing sludge problem, is the burdensome task of pendulum in face of ours, and key be sludge water content lower, mass dryness fraction brings up on economic calorific value.
The purpose of sludge treatment is to reach minimizing, stabilization, innoxious and resource utilization.More ripe method for sludge treatment has landfill, compost and burning etc. at present.
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, mud, and the construction of landfill yard, use are limited by geology, the hydrology and edaphic condition.
Compost: the organism in 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 at high temperature fully burning comparatively economically in mud, finally become stable lime-ash.Burning method have subtract appearance, weight-loss ratio is high, processing speed is fast, and is innoxious more thorough, waste heat can be used for generating or the advantage such as heat supply.In recent years, burning method has adopted suitable pretreatment technology and advanced incinerating method, has satisfied more and more stricter environmental requirement, is current method for sludge treatment preferably.
As mentioned above, present domestic ectoplasm paper plant is generally with the residue biological sludge of sewage disposal, three grades of decolouring chemical sludges and primary sludge mixed dehydrations, outward transport landfill.Extremely indivedual burnings are also to burn at coal firing boiler, rarely have sub-prime processing, 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 freight charges in a large number, burn and need dewater by extra fuel, the Technological Economy difficulty is very large, also there is no at present the slurry paper sludge incineration device of energy steady running both at home and abroad.
Masson pine factory, large-scale machine are starched factory; generally be furnished with power boiler, alkali recovery boiler; this burns the type of furnace for deeply dehydrating sludge, multifuel combustion generating provide economical preferably, and all possesses the economic basic fuel that burns: coal, alkali reclaim super 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 caustic soda legal system pulping process, the washings of the paper pulp after the washing boiling, it is black, wherein contains inorganics in cooking liquor and lignin, hemicellulose and cellulosic degraded product and the organic acid etc. of stripping from plant fiber material.Inorganics comprise free sodium hydroxide, sodium sulfate, sodium sulphite, sodium carbonate and with the sodium of organism chemical combination, silicon-dioxide etc.Black liquor directly enters rivers and can pollute, and should process.Treatment process is first evaporation concentration, then through burning, recyclable soda ash.The heat that burning generates reclaims with vapor form.Most of inorganics becomes molten state in combustion processes, after dissolving green liquor (green liquor).Green liquor becomes white liquid (white liquor) through the milk of lime causticization after clarification, can be used for preparing cooking liquor paper pulp processed.Be precipitated as calcium carbonate (paper industry is called white clay) after 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 as follows:
(1) add flocculant aid in the biological sludge of collecting, its mass concentration in biological sludge is 1～3ppm;
(2) will separate through the biological sludge predrainage that step (1) is processed, and make the massfraction of its dry substance reach 10%～15%;
(3) will be preheated to through the biological sludge that (2) step predrainage is separated after 110-125 ℃ and mix evaporation concentration to the massfraction of its dry substance with black liquor in slurry paper production process and reach more than 70%, wherein black liquor is the washings of the paper pulp after the washing boiling in sulphate process or caustic soda legal system pulping process, it contains inorganics in cooking liquor and the lignin of stripping from plant fiber material, hemicellulose and cellulosic degraded product and organic acid, inorganics comprises free sodium hydroxide, sodium sulfate, sodium sulphite, sodium carbonate and with the sodium of organism chemical combination, silicon-dioxide,
(4) massfraction that the mixture that makes of (3) step is continued be concentrated into its dry substance reaches more than 80%;
(5) mixture that makes of burning (4) step, the superheated vapour of generation is used for power generation and heat supply, most of inorganics becomes molten state in combustion processes, after dissolving green liquor, green liquor obtains white liquid through causticization after clarification.
Flocculant aid is molecular weight greater than 1,000 ten thousand cationic polyacrylamide in step (1).
Use separating centrifuge to carry out predrainage in step (2) and separate, the main frame rotary drum power of separating centrifuge is that 75KW, specified speed are 3000rpm.。
Use thickener to carry out concentration in step (4), the hydraulic fluid side service temperature of thickener used 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 as follows:
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 starch the paper biological sludge at first concentrated through coagulant aids flocculation, predrainage, mix 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, steam is used for power generation and heat supply, carry out causticizing reaction after the melts dissolving and obtain white liquid, can be used for preparation cooking liquor paper pulp processed.The biological sludge solid waste is turned waste into wealth in the present invention, make the slurry factory reach zero release, realized cleaner production, energy-saving and emission-reduction, reduced garbage loading embeading, be conducive to develop a circular economy.Technology is novel, can reach the 3R target (Reduce, Reuse, Recycle) that international cleaner production is advocated.
Use the inventive method can produce 18.75 tons/day, the mud (folding over dry ton 15t/d) that contains dry substance 80%, super dense biological sludge conversion calorific value is that the super concentrated black liquid of 7.5MJ/kg(slurrying is converted separately calorific value 13.3 MJ/kg), save 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, 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 in detail the inventive method is described in detail.
The inventive method step is as follows:
(1) collect the residue biological sludge of starching factory's sewage works secondary biochemical aerating system generation, its dry solids content is that 2～3%(is that the massfraction of dry substance is 2～3%), carry (15L/s) through spiral pump, to the biological sludge advanced treatment storage tank (60m of workshop section between the alkali recovery vehicle
3The concrete pond).Add in the storage tank molecular weight greater than 1,000 ten thousand cationic polyacrylamide as flocculant aid, model is inferior assorted blue 268C, after dilution, flocculant aid mass concentration in mud is 1～3ppm.
The biological sludge predrainage of (2) the upper step being collected is concentrated, makes that its dry solids content is 10%～15% after predrainage.Equipment therefor is a kind of sleeping spiral shell sedimentation centrifugal separator, and its characteristic parameter is: main frame rotary drum power is 75KW, specified speed 3000rpm, and spiral conveyer is by 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 enters and do not separate immediately after whizzer but after 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 concentrated of biological sludge.Differential between rotary drum and spiral conveyer adopts reliably two variable frequency adjustment mechanical differential devices, 0.05 rev/min of differential sharpness of regulation value.Two variable frequency adjustment mechanical differential devices can be regulated differential automatically by the thickness of mud layer in whizzer, reach automatic adjusting moment of torsion.
(3) biological sludge after the upper step is concentrated is preheating to 110 ℃, mixes with black liquor and carries out multiple-effect evaporation, until the content of the dry substance of mixed solution reaches 70%.Primary heater 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 effect biological sludge-black liquor to mix 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 evaporation reaches 70%～75%.
(4) mixture that the upper step was obtained continues in super thickener (Super Concentrator:1SCO+S01) concentrated, until dry solids content reaches more than 80%.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) mixture that the upper step was obtained sprays burning in the alkali stove, produce superheated vapour, drives the generator generating by steam turbine.Most of inorganics becomes molten state in combustion processes, after dissolving green liquor, green liquor becomes white liquid through the milk of lime causticization after clarification, can be used for preparing cooking liquor paper pulp processed.Alkali stove day burning alkali used 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 the preferred technical solution of the present invention, and some changes that those skilled in the art may make some part have wherein all embodied principle of the present invention, within belonging to protection scope of the present invention.
Claims (4)
1. treatment process of starching the paper biological sludge is characterized in that its step is as follows:
(1) add flocculant aid in the biological sludge of collecting, its mass concentration in biological sludge is 1～3ppm;
(2) will separate through the biological sludge predrainage that step (1) is processed, and make the massfraction of its dry substance reach 10%～15%;
(3) will be preheated to through the biological sludge that (2) step predrainage is separated after 110-125 ℃ and mix evaporation concentration to the massfraction of its dry substance with black liquor in slurry paper production process and reach more than 70%, wherein black liquor is the washings of the paper pulp after the washing boiling in sulphate process or caustic soda legal system pulping process, it contains inorganics in cooking liquor and the lignin of stripping from plant fiber material, hemicellulose and cellulosic degraded product and organic acid, inorganics comprises free sodium hydroxide, sodium sulfate, sodium sulphite, sodium carbonate and with the sodium of organism chemical combination, silicon-dioxide,
(4) massfraction that the mixture that makes of (3) step is continued be concentrated into its dry substance reaches more than 80%;
(5) mixture that makes of burning (4) step, the superheated vapour of generation is used for power generation and heat supply, most of inorganics becomes molten state in combustion processes, after dissolving green liquor, green liquor becomes white liquid through the milk of lime causticization after clarification.
2. the treatment process of slurry paper biological sludge according to claim 1 is characterized in that flocculant aid in step (1) is 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 step (2) separating centrifuge to carry out predrainage and separate, 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 step (4) thickener to carry out concentration, the hydraulic fluid side service temperature of thickener used is 160～200 ℃, and the heated side heating steam pressure is 5～12bar, and temperature is 200～250 ℃.
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| CN 201110311772 CN102372409B (en) | 2011-09-27 | 2011-09-27 | Treatment method of paper pulp biological sludge |
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| CN 201110311772 CN102372409B (en) | 2011-09-27 | 2011-09-27 | Treatment method of paper pulp biological sludge |
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| CN102874769B (en) * | 2012-10-09 | 2014-07-02 | 广西大学 | Method and device for oxidative conversion of sodium sulfide in alkali fusant |
| 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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| 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 |
| CN101775750B (en) * | 2010-01-22 | 2012-09-05 | 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 |
| CN102001812B (en) * | 2010-11-22 | 2012-06-06 | 杭州苏堤环保实业有限公司 | Deep sludge dewatering process |
| CN102079615B (en) * | 2010-12-21 | 2012-03-21 | 湖南骏泰浆纸有限责任公司 | Method for harmlessly recycling sludge |
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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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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
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 |