CN103771681A - Method for extracting and recycling nitrogen and phosphorus in biochemical papermaking sludge and dehydrating sludge - Google Patents
Method for extracting and recycling nitrogen and phosphorus in biochemical papermaking sludge and dehydrating sludge Download PDFInfo
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- CN103771681A CN103771681A CN201410064855.0A CN201410064855A CN103771681A CN 103771681 A CN103771681 A CN 103771681A CN 201410064855 A CN201410064855 A CN 201410064855A CN 103771681 A CN103771681 A CN 103771681A
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- 239000010802 sludge Substances 0.000 title claims abstract description 60
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 27
- 229910052698 phosphorus Inorganic materials 0.000 title abstract description 25
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title abstract description 14
- 239000011574 phosphorus Substances 0.000 title abstract description 14
- 238000004064 recycling Methods 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910001868 water Inorganic materials 0.000 claims abstract description 52
- 244000005700 microbiome Species 0.000 claims abstract description 9
- 238000005189 flocculation Methods 0.000 claims abstract description 8
- 230000016615 flocculation Effects 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 239000002028 Biomass Substances 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 claims description 23
- 239000010893 paper waste Substances 0.000 claims description 19
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 claims description 14
- 239000004744 fabric Substances 0.000 claims description 10
- 239000012634 fragment Substances 0.000 claims description 8
- 238000002203 pretreatment Methods 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000013467 fragmentation Methods 0.000 claims description 5
- 238000006062 fragmentation reaction Methods 0.000 claims description 5
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000003834 intracellular effect Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000005416 organic matter Substances 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 235000015097 nutrients Nutrition 0.000 claims description 3
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 abstract description 9
- 230000018044 dehydration Effects 0.000 abstract description 8
- 238000006297 dehydration reaction Methods 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 abstract description 7
- 238000004065 wastewater treatment Methods 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 238000004537 pulping Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 230000000050 nutritive effect Effects 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 239000000123 paper Substances 0.000 description 5
- 230000003203 everyday effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000005696 Diammonium phosphate Substances 0.000 description 1
- 102000002322 Egg Proteins Human genes 0.000 description 1
- 108010000912 Egg Proteins Proteins 0.000 description 1
- 241000274582 Pycnanthus angolensis Species 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 241000589651 Zoogloea Species 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 1
- 235000019838 diammonium phosphate Nutrition 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 239000000618 nitrogen fertilizer Substances 0.000 description 1
- 210000004681 ovum Anatomy 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Paper (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention relates to a method for extracting and recycling nitrogen and phosphorus in biochemical papermaking sludge and dehydrating the sludge, belonging to the field of pulping and papermaking environment friendliness. The method is adopted for overcoming the current situations that papermaking wastewater is rich in carbon source and lack of nitrogen and phosphorus, microorganisms in biochemical sludge are rich in nitrogen and phosphorus, part of the biochemical sludge is finally used as residual sludge to be discharged out of a water treatment system, and the dehydration is difficult. The method comprises the steps of ultrasonic crushing, flocculation and mechanical filter pressing is adopted. Firstly, microorganisms are crushed under the ultrasonic action so that substances in the microorganism are released, then, solid-liquid separation is realized under the actions of flocculation and machines, the liquid is recycled to a papermaking wastewater treatment process, the weight of the recycled N and P in treating every ton of biochemical sludge can be respectively up to over 0.45kg and over 0.1kg, and the nitrogen and phosphorus which are added for biochemically treating the papermaking wastewater can be effectively reduced; and meanwhile, the dryness of the sludge can be up to over 50%, the heat value of the sludge can be up to over 6MJ/kg, and the sludge can be directly burned in a biomass boiler. By using the method, the biochemical papermaking sludge can be comprehensively utilized.
Description
Technical field
The present invention relates to a kind of method of extracting reuse papermaking biochemical sludge nitrogen phosphorus and realizing sludge dewatering, belong to pulping and paper-making environmental technology field.
Background technology
In paper-making process except meeting produces a large amount of waste water, also have a large amount of solid waste to produce, the former is at present because being subject to national departments concerned and social extensive concern, also a lot of effectively control measures have been taked, especially the Eleventh Five-Year Plan period, the enforcement of relevant policies standard, and the renewal of enterprise technology equipment, more than 96% waste water is realized qualified discharge, and Wastewater Pollutant reduction of discharging obtains remarkable effect.Waste water is after physics, biology and chemical treatment, finally separate with water body with the form of primary sludge, biochemical sludge and chemical sludge, along with raising, the monitoring strengthening of implementation dynamics and the continuous expansion of papermaking industry size of wastewater discharge standard, this class sludge yield also will continue to increase at a high speed.Especially waste water is after biological activity mud method is processed, and 0.5%～1.0% of its volume precipitates with the form of residual active sludge.The zoogloea that residual active sludge is formed by multiple-microorganism and the aggregate that the organism of its absorption and inorganics form, also contain organism, nitrogen phosphorus, heavy metal and the salt of difficult degradation and a small amount of pathogenic micro-organism and parasitic ovum etc. in addition.This class moisture percentage in sewage sludge is very high, generally all between 95%～99.5%, is difficult to process, and its investment and working cost are larger, can account for that whole sewage work invests and working cost 25%～65%, become the heavy economical load in waste water treatment plant.The sludge creation amount of paper waste processing is large, is generally 5～10 times of same size municipal wastewater treatment plant.So a large amount of paper mill sludges, if do not carried out appropriate processing, will cause secondary pollution.The harmless treatment of paper mill sludge has become environmental problem urgently to be resolved hurrily with disposal, therefore, and the problem how economically these mud of disposal and utilization have become people to be very concerned about.The key of sludge treatment is dehydration, and this is because its water ratio becomes nonlinear relationship with its volume.Sludge dewatering can effectively reduce to be needed to process the sludge volume of disposing, and is a kind of method the most economic in sludge reduction, is also that sludge ultimate disposal is as requisite links such as burning, compost.
In addition, in paper waste, carbon source is abundant, but nitrogen, phosphorus lacks, and therefore in biochemical treatment process, needs to add nutritive salt (nitrogenous fertilizer and phosphate fertilizer) in waste water.Processing the water yield as day is 30000m
3paper waste treatment station, entering biochemistry pool COD is 900mgL
-1, in COD: N: P=350: within 5: 1, ratio adds nutritive salt, need add the urea (every bag of 40kg) of nitrogen content 46.4% and containing available phosphorus (with P
2o
5meter) 45% diammonium phosphate (every bag of 50kg) is respectively 17.2 bags and 7.9 bags.The purchase cost of nutritive salt is considerable.The machinery that added of nutritive salt adds method and manually adds method.So a large amount of input manpower and materials of nutrients addition are also considerable.And the biochemical sludge main component of paper waste processing is microorganism.Carbon, nitrogen, phosphorus are the indispensable nutritive elements that forms microorganism.If the nitrogen phosphorus in microbe effectively can be utilized, can save the input of part nutritive salt.
How effectively the nitrogen phosphate use in pulp and paper effluent treatment biochemical sludge to be got up, save adding of nitrogen and phosphorous nutrient in paper-making effluent, thereby reduce costs, realize the deep dehydration of paper waste biochemical sludge simultaneously, improve its utilization ratio most important.Traditional concentrate/mechanical dehydration technique can only be removed pore water and the part capillary water that major part is free state, is difficult to make mud to realize deep dehydration, be also difficult to the nitrogen phosphorus in the microbe of biochemical sludge to discharge simultaneously, and by its utilization.
Summary of the invention
The invention provides a kind of method of extracting reuse papermaking biochemical sludge nitrogen phosphorus and realizing sludge dewatering.Abundant for paper waste carbon source, nitrogen, phosphorus lack, and rich Nitrogen-and Phosphorus-containing in microbe in biochemical sludge, and a part of biochemical sludge is finally discharged water treatment system and the difficult present situation of dewatering as excess sludge.Adopt the method for ultrasonic disruption+flocculation agent+mechanism filter-pressing, first by hyperacoustic effect by microbe fragmentation, its inner material is discharged, make fragment wadding poly-by the effect such as flutter of charge neutrality, adsorption bridging, the net of flocculation agent again, finally reach solid-liquid separation by the effect of mechanism filter-pressing, liquid is back to use in process of paper-making wastewater treatment, reuse nitrogen phosphorus, effectively reduce the nitrogen phosphorus that paper waste biochemical treatment adds, solid mass dryness fraction can reach more than 50% simultaneously, realize the deep dehydration of mud, can in biomass boiler, directly burn.
For achieving the above object, concrete solution of the present invention is:
(1) pre-treatment of paper waste biochemical sludge
Get the paper waste of 150ml and process biochemical sludge, be 400～500W by the power of ultrasonic vibrations energy conversion apparatus, ultrasonic frequency is 20～25kHz, stretches in mud it is processed to 8～12s, under hyperacoustic mechanical effect, cavitation effect effect, realize biochemical sludge in the fragmentation of microorganism.Intracellular organic matter and moisture are discharged, make water in part born of the same parents be converted into planar water.
(2) flocculation treatment
The mud mixture obtaining through step (1), low whipping speed is under the condition of 300～400rpm, add the aluminium iron polychloride that butt massfraction is 8～14%, after 30s, stirring velocity is adjusted to 50～80rpm, the molecular weight that interpolation butt massfraction is 0.1-0.5% is 1200～15,000,000 cationic-type polyacrylamide.It is poly-that the effect of flutterring by charge neutrality, absorption, bridge formation and net makes mud fragment that wadding occur, and reduces the planar water of mud, makes part planar water be converted into free water.
(3) mechanism filter-pressing
After step (1) and (2) processing, adopt plate-and-frame filter press to carry out press filtration, solid-liquid is separated, the pressure of pressure filter used is 1.8～2.2Mpa, canvas press cloth is two-layer, with the aperture of mud contact layer be 200 orders, the aperture of supporting layer is 40 orders.Under the effect of pressure filter, mud fragment is trapped on filter cloth, and mass dryness fraction can reach more than 50%, and its thermal value, more than 6MJ/kg, can directly send biomass boiler to burn, and realizes subduing of mud.Free water and planar water are passed through canvas press cloth, in this part water, N, P concentration are respectively 4.6mg/L and more than 1.0mg/L, and COD concentration is 240mg/L left and right, concentration of nitrogen and phosphorus is far above COD: N: P=350: the interpolation standard of 5: 1, send this part water back to paper waste biochemical treatment section, can save the addition of biochemical section N, P.
Accompanying drawing explanation
Fig. 1 invention schema;
The scanning electron microscope (SEM) photograph of mud before Fig. 2 pre-treatment;
The scanning electron microscope (SEM) photograph of mud after Fig. 3 pre-treatment.
Embodiment
Further illustrate feature of the present invention below by concrete example.
Embodiment 1
Mud is taken from 80,000 m of Shandong large-scale pulping and paper-making integrated factory
3/ d waste water treatment engineering second pond, therefrom extracts as follows reuse nitrogen phosphorus and realizes deep dehydration:
(1) pre-treatment of paper waste biochemical sludge
Getting the paper waste of 150ml and process biochemical sludge, is 400w by the power of ultrasonic vibrations energy conversion apparatus, and ultrasonic frequency is 20kHz, stretches in mud it is processed to 10s, under hyperacoustic mechanical effect, cavitation effect effect, realize biochemical sludge in the fragmentation of microorganism.Intracellular organic matter and moisture are discharged, make water in part born of the same parents be converted into planar water.
(2) flocculation treatment
The mud mixture obtaining through step (1), low whipping speed is under the condition of 300rpm, add the aluminium iron polychloride that butt massfraction is 10%, after 30s, stirring velocity is adjusted to 50rpm, the cationic-type polyacrylamide that the molecular weight that interpolation butt massfraction is 0.5% is 12,000,000.It is poly-that the effect of flutterring by charge neutrality, absorption, bridge formation and net makes mud fragment that wadding occur, and reduces the planar water of mud, makes part planar water be converted into free water.
(3) mechanism filter-pressing
After step (1) and (2) processing, adopt plate-and-frame filter press to carry out press filtration, solid-liquid is separated, the pressure of pressure filter used is 1.8Mpa, canvas press cloth is two-layer, with the aperture of mud contact layer be 200 orders, the aperture of supporting layer is 40 orders.Under the effect of pressure filter, mud fragment is trapped on filter cloth, and mass dryness fraction can reach more than 53%, and its thermal value, more than 6MJ/kg, can directly send biomass boiler to burn, and realizes subduing of mud.Free water and planar water are passed through canvas press cloth, in this part water, N, P concentration are respectively 4.6mg/L and 1.0mg/L, and COD concentration is 238mg/L, concentration of nitrogen and phosphorus is far above COD: N: P=350: the interpolation standard of 5: 1, send this part water back to paper waste biochemical treatment section, produce 0.4kg biochemical sludge by removing per kilogram COD, second pond biochemical sludge concentration is 0.91%, after processing, the final mass dryness fraction of mud is more than 50%, process more than every t over dry biochemical sludge takes off 98t water, the each 0.45kg of recyclable N and P and 0.1kg, 80,000 m
3the engineering of water treatment of/d, biochemical section influent COD is 900mg/L, water outlet COD is 240mg/L, produces biochemical sludge oven-dry weight every day and is about 21.12t, can reuse N, P be respectively 9.5kg and 2kg, with 80,000 m
3/ d engineering of water treatment calculates, and can save 9.5kg nitrogen and 2kg phosphorus every day, and the amount that can save N and P for 1 year is respectively 3467.5kg and 730kg.
Embodiment 2
Mud is taken from small-sized paper mill 30,000 m of certain take waste and old boxboard as raw material production wrapping paper of Hebei
3/ d waste water treatment engineering second pond, therefrom extracts as follows reuse nitrogen phosphorus and realizes deep dehydration:
(1) pre-treatment of paper waste biochemical sludge
Getting the paper waste of 150ml and process biochemical sludge, is 500w by the power of ultrasonic vibrations energy conversion apparatus, and ultrasonic frequency is 25kHz, stretches in mud it is processed to 12s, under hyperacoustic mechanical effect, cavitation effect effect, realize biochemical sludge in the fragmentation of microorganism.Intracellular organic matter and moisture are discharged, make water in part born of the same parents be converted into planar water.
(2) flocculation treatment
The mud mixture obtaining through step (1), low whipping speed is under the condition of 400rpm, add the aluminium iron polychloride that butt massfraction is 10%, after 30s, stirring velocity is adjusted to 80rpm, the cationic-type polyacrylamide that the molecular weight that interpolation butt massfraction is 0.1% is 15,000,000.It is poly-that the effect of catching by charge neutrality, absorption, bridge formation and net makes mud fragment that wadding occur, and reduces the planar water of mud, makes part planar water be converted into free water.
(3) mechanism filter-pressing
After step (1) and (2) processing, adopt plate-and-frame filter press to carry out press filtration, solid-liquid is separated, the pressure of pressure filter used is 2.2Mpa, canvas press cloth is two-layer, with the aperture of mud contact layer be 200 orders, the aperture of supporting layer is 40 orders.Under the effect of pressure filter, mud fragment is trapped on filter cloth, and mass dryness fraction can reach more than 54%, and its thermal value, more than 6MJ/kg, can directly send biomass boiler to burn, and realizes subduing of mud.Free water and planar water are passed through canvas press cloth, in this part water, N, P concentration are respectively 5.2mg/L and 1.1mg/L, and COD concentration is 260mg/L, concentration of nitrogen and phosphorus is far above COD: N: P=350: the interpolation standard of 5: 1, send this part water back to paper waste biochemical treatment section, produce 0.4kg biochemical sludge by removing every kgCOD, second pond biochemical sludge concentration is 0.91%, after processing, the final mass dryness fraction of mud is more than 50%, process more than every t over dry biochemical sludge takes off 98t water, the each 0.51kg of recyclable N and P and 0.11kg, 30,000 m
3the engineering of water treatment of/d, biochemical section influent COD is 1000mg/L, water outlet COD is 250mg/L, produces biochemical sludge oven-dry weight every day and is about 9t, can reuse N, P be respectively 4.6kg and 1.0kg, with 30,000 m
3/ d engineering of water treatment calculates, and can save 4.6kg nitrogen and 1.0kg phosphorus every day, and the amount that can save N and P for 1 year is respectively 1679kg and 365kg.
Claims (1)
1. the method extracting reuse papermaking biochemical sludge nitrogen phosphorus and realize sludge dewatering.It is characterized in that, comprise the following steps:
(1) pre-treatment of paper waste biochemical sludge, get a certain amount of paper waste and process biochemical sludge, be 400-500W by the power of ultrasonic vibrations energy conversion apparatus, ultrasonic frequency is 20-25kHz, stretch in mud it processed to 8-12s, under hyperacoustic mechanical effect, cavitation effect effect, realize biochemical sludge in the fragmentation of microorganism.Intracellular organic matter and moisture are discharged, make water in part born of the same parents be converted into planar water, this part Shuifu County Nitrogen-and Phosphorus-containing;
(2) flocculation treatment, the mud mixture obtaining through step (1), low whipping speed is under the condition of 300-400rpm, add the aluminium iron polychloride that butt massfraction is 8-14%, after 30s, stirring velocity is adjusted to 50-80rpm, adding point strength that butt massfraction is 0.1-0.5% is the cationic-type polyacrylamide of 1200-1500 ten thousand.It is poly-that the effect of flutterring by charge neutrality, absorption, bridge formation and net makes mud fragment that wadding occur, and reduces the planar water of mud, makes part planar water be converted into free water;
(3) mechanism filter-pressing, after step (1) and (2) processing, adopt plate-and-frame filter press to carry out press filtration, free water and part planar water are taken off, the water that this part water comprises rich Nitrogen-and Phosphorus-containing in step (1), is back to use paper waste by this part water and processes biochemistry pool Substitute For Partial nitrogen and phosphorous nutrient.The pressure of pressure filter used is 1.8-2.2pa, and canvas press cloth is two-layer, with the aperture of mud contact layer be 200 orders, the aperture of supporting layer is 40 orders.Mud mass dryness fraction after pressure filter press filtration can reach more than 50%, and its thermal value, more than 6MJ/kg, can directly send biomass boiler to burn, and realizes subduing of mud.
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| CN104671636A (en) * | 2015-01-30 | 2015-06-03 | 深圳市水务(集团)有限公司 | Deep dehydration conditioning medicament for sludge and application method of deep dehydration conditioning medicament |
| CN104891774A (en) * | 2015-05-25 | 2015-09-09 | 遵义师范学院 | Method for treating sludge by use of polyaluminum chloride and ultrasonic combining technology |
| CN105502866A (en) * | 2016-02-05 | 2016-04-20 | 无锡国联环保能源集团有限公司 | Method and system for recycling struvite from sludge |
| CN105621846A (en) * | 2015-12-29 | 2016-06-01 | 华东理工大学 | Method for dewatering sludge by means of flocculation conditioner coupling ultrasonic oxidation |
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| CN104891774A (en) * | 2015-05-25 | 2015-09-09 | 遵义师范学院 | Method for treating sludge by use of polyaluminum chloride and ultrasonic combining technology |
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| CN108101323A (en) * | 2018-01-05 | 2018-06-01 | 中冶华天南京工程技术有限公司 | It is ultrasonically treated the technique of municipal wastewater excess sludge |
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| CN110194571A (en) * | 2019-05-29 | 2019-09-03 | 邱振权 | Paper mill sludge preprocess method |
| CN114804538A (en) * | 2022-05-19 | 2022-07-29 | 山东合创新材料有限公司 | Sludge recycling process of primary sedimentation tank for manufacturing bobbin paper |
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