CN116145459A - Papermaking method by utilizing recycled sludge - Google Patents
Papermaking method by utilizing recycled sludge Download PDFInfo
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- CN116145459A CN116145459A CN202310160861.5A CN202310160861A CN116145459A CN 116145459 A CN116145459 A CN 116145459A CN 202310160861 A CN202310160861 A CN 202310160861A CN 116145459 A CN116145459 A CN 116145459A
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- sludge
- papermaking
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- 239000010802 sludge Substances 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 241000894006 Bacteria Species 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 19
- 238000000855 fermentation Methods 0.000 claims abstract description 16
- 230000004151 fermentation Effects 0.000 claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 11
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 10
- NHKHUHXMKHSOJT-UHFFFAOYSA-N 2-methyl-1,2-thiazolidin-4-one Chemical compound CN1CC(=O)CS1 NHKHUHXMKHSOJT-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims abstract description 9
- 239000008394 flocculating agent Substances 0.000 claims abstract description 7
- PZNOBXVHZYGUEX-UHFFFAOYSA-N n-prop-2-enylprop-2-en-1-amine;hydrochloride Chemical compound Cl.C=CCNCC=C PZNOBXVHZYGUEX-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 39
- 238000003490 calendering Methods 0.000 claims description 28
- 238000004537 pulping Methods 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 14
- 229920000742 Cotton Polymers 0.000 claims description 13
- 108010010803 Gelatin Proteins 0.000 claims description 13
- 230000018044 dehydration Effects 0.000 claims description 13
- 238000006297 dehydration reaction Methods 0.000 claims description 13
- 229920000159 gelatin Polymers 0.000 claims description 13
- 239000008273 gelatin Substances 0.000 claims description 13
- 235000019322 gelatine Nutrition 0.000 claims description 13
- 235000011852 gelatine desserts Nutrition 0.000 claims description 13
- 244000063299 Bacillus subtilis Species 0.000 claims description 9
- 235000014469 Bacillus subtilis Nutrition 0.000 claims description 9
- 241000193385 Geobacillus stearothermophilus Species 0.000 claims description 9
- 241000192023 Sarcina Species 0.000 claims description 8
- 239000010985 leather Substances 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 4
- 230000007062 hydrolysis Effects 0.000 abstract 1
- 238000006460 hydrolysis reaction Methods 0.000 abstract 1
- 230000000813 microbial effect Effects 0.000 abstract 1
- 230000020477 pH reduction Effects 0.000 abstract 1
- 229920000642 polymer Polymers 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 54
- 230000000052 comparative effect Effects 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000004927 wastewater treatment sludge Methods 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000194107 Bacillus megaterium Species 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 241000222178 Candida tropicalis Species 0.000 description 1
- 241000187392 Streptomyces griseus Species 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/01—Waste products, e.g. sludge
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/22—Proteins
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Treatment Of Sludge (AREA)
- Paper (AREA)
Abstract
The invention discloses a method for papermaking by utilizing recovered sludge, which comprises the steps of firstly adopting heat treatment to papermaking sludge, then adding a flocculating agent, adopting ionic polyacrylamide, polyaluminium chloride, polydimethyl diallyl ammonium chloride, polyethylene oxide and 2-methylisothiazolinone to form the flocculating agent, fully removing organic matters and other components in the sludge, improving the water removal rate of the sludge, adopting composite bacteria for mixed fermentation to filter the dewatered sludge, fully destroying extracellular polymers and microbial cells of the sludge, accelerating hydrolysis and acidification of the sludge, fully removing sludge odor, impurities, mud, organic matters and the like, and obtaining fibers in the sludge which are used in papermaking again, thereby improving the finished product performance of paper.
Description
Technical Field
The invention relates to the field of papermaking, in particular to a method for papermaking by utilizing recycled sludge.
Background
When treating paper mill wastewater, wastewater treatment sludge that is difficult to treat and contains complex elemental components is often generated. Biochemical sludge, sediment sludge and flocculation sediment sludge belong to wastewater treatment sludge, wherein parenchyma cell substances, papermaking fiber substances, ash, miscellaneous cells and the like are involved. Wastewater treatment sludge has greater sludge digestion and treatment difficulties, particularly for hydrophilic sludge components. In addition, the flocculated sludge containing the poorly soluble biomass is difficult to thoroughly degrade in a short time, and the sludge should be recovered as necessary by paper industry and reused in paper industry.
Disclosure of Invention
Accordingly, the present invention provides a method for papermaking by using recycled sludge, which solves the above problems.
The technical scheme of the invention is realized as follows:
a method for papermaking by using recycled sludge, comprising the following steps:
s1: carrying out heat treatment on sludge, mixing the sludge subjected to heat treatment with a flocculating agent, dehydrating, and filtering to obtain dehydrated sludge, wherein the flocculating agent comprises nonionic polyacrylamide, polyaluminium chloride, polydimethyl diallyl ammonium chloride, polyethylene oxide and 2-methylisothiazolinone;
s2: mixing and fermenting the dehydrated sludge and composite bacteria, and filtering to obtain fermented sludge, wherein the composite bacteria comprise bacillus stearothermophilus, bacillus subtilis and sarcina sporophore;
s3: mixing the fermented sludge with papermaking slurry to prepare the paper.
Further, in the step S1, the heat treatment is to adjust the pH value of the sludge to 10-10.5 and heat the sludge at 110-120 ℃ for 7-9h.
Further, in the step S1, the flocculant comprises, by weight, 40-50 parts of nonionic polyacrylamide, 8-12 parts of polyaluminum chloride, 13-15 parts of polydimethyldiallyl ammonium chloride, 17-20 parts of polyethylene oxide and 1-3 parts of 2-methylisothiazolinone.
Further, in the step S1, the sludge after heat treatment and the flocculant are mixed and react for 2.5-3.5 hours at 37-45 ℃, and the mass ratio of the sludge after heat treatment to the flocculant is 10:0.03-0.05.
Further, in the step S2, the mass ratio of the bacillus stearothermophilus to the bacillus subtilis to the bacillus octaazidosus is 4-6:3-3.5:1-2.
In step S2, the mass ratio of the complex bacteria to the dehydrated sludge is 0.07-0.1:100.
Further, in the step S2, the fermentation temperature of the composite bacteria and the dehydrated sludge is 45-50 ℃ and the fermentation time is 60-72 hours.
Further, in the step S3, the mass ratio of the fermented sludge to the papermaking slurry is 0.6-0.8:0.1-0.4.
Further, the paper making method of the invention comprises the following steps:
(1) Crushing cotton fibers, and screening by a vibrating screen to obtain short fibers with the length of 0.5-2.5 mm.
(2) Pouring the fermented sludge, short fibers and gelatin into a pulp mixing tank, pulping and pulp mixing, uniformly mixing, pulping with a pulping degree of 70-80 DEG SR, and pulp mixing to obtain pulp with a concentration of 3.5-4.0%.
(3) And (3) feeding the slurry to a high-level box net surface at a spray angle of 45 degrees by using a slurry pump to manufacture paper.
(4) The manufactured layer paper is sent to a roller for winding through a conveying system, and preliminary water removal is carried out through squeezing between the two rollers; the sheet was peeled off the drum after winding 3 to 4 layers.
(5) The separated leathers and the water seepage net are alternately laid and sent into a squeezer for mechanical dehydration, and the leathers are heated by high-temperature steam at 115-125 ℃ in the squeezing process, and the water content of the leathers after squeezing is 8-10%.
(6) Carrying out calendaring treatment on the heated paper leather, wherein the calendaring temperature is 100-110 ℃, and the calendaring pressure is 135-145kg/m 2 The calendaring speed is 8-12m/min, and the finished product is obtained.
The invention has the beneficial effects that:
the invention firstly carries out heat treatment on the sludge, can dissolve out organic matters in the sludge, changes the physicochemical property of the sludge, mixes the sludge after heat treatment with a flocculating agent, can remove the organic matters in the sludge and kill microorganisms, removes sludge odor, improves the dehydration rate in the step S1, and uses bacillus stearothermophilus, bacillus subtilis and sarcina to form composite bacteria. The pretreated sludge and papermaking slurry can be used for preparing the hard paperboard, so that the performance of the hard paperboard can be improved.
Detailed Description
In order to better understand the technical content of the present invention, the following provides specific examples to further illustrate the present invention.
Example 1
S1: the sludge is subjected to heat treatment, wherein the pH value of the sludge is regulated to 10 by using sodium hydroxide, the sludge is heated for 7 hours at 110 ℃, the flocculant comprises 40 parts of nonionic polyacrylamide, 8 parts of polyaluminum chloride, 13 parts of polydimethyl diallyl ammonium chloride, 17 parts of polyethylene oxide and 1 part of 2-methylisothiazolinone in parts by weight, the sludge after heat treatment and the flocculant are mixed and react for 2.5 hours at 37 ℃, the mass ratio of the sludge after heat treatment to the flocculant is 10:0.03, and the sludge after dehydration and filtration are carried out to obtain the sludge after dehydration.
S2: mixing and fermenting the composite bacteria with the mass ratio of 0.07:100 and dehydrated sludge, wherein the fermentation temperature is 45 ℃, the fermentation time is 60 hours, the composite bacteria consist of bacillus stearothermophilus, bacillus subtilis and sarcina spore with the mass ratio of 4:3:1, and filtering to obtain the fermented sludge with the water content of 45 percent.
S3: mixing the fermented sludge with papermaking slurry, wherein the mass ratio of the fermented sludge to the papermaking slurry is 0.6:0.1, wherein the papermaking slurry is cotton fiber and gelatin with the mass ratio of 1:0.05, and is prepared into paper.
The paper making method comprises the following steps:
(1) Crushing cotton fibers, and screening by a vibrating screen to obtain short fibers with the length of 0.5-2.5 mm.
(2) Pouring the fermented sludge, short fibers and gelatin into a pulp mixing tank, pulping and pulp mixing, uniformly mixing, pulping at a pulping degree of 70 DEG SR, and mixing to obtain pulp with a concentration of 3.5%.
(3) And (3) feeding the slurry to a high-level box net surface at a spray angle of 45 degrees by using a slurry pump to manufacture paper.
(4) The manufactured layer paper is sent to a roller for winding through a conveying system, and preliminary water removal is carried out through squeezing between the two rollers; the sheet was peeled off the drum after winding 3 layers.
(5) The separated paper sheet and the water seepage net are alternately layered and sent into a squeezer for mechanical dehydration, and the paper sheet is heated by high-temperature steam at 115 ℃ in the squeezing process, and the water content of the squeezed paper sheet is 8%.
(6) Carrying out calendaring treatment on the heated paper leather, wherein the calendaring temperature is 100 ℃, and the calendaring pressure is 135kg/m 2 The calendaring speed is 8m/min, and the finished product is obtained.
Example 2
S1: the sludge is subjected to heat treatment, wherein the pH value of the sludge is regulated to 10.5 by using sodium hydroxide, the sludge is heated for 9 hours at 120 ℃, the flocculant comprises 50 parts of nonionic polyacrylamide, 12 parts of polyaluminium chloride, 15 parts of polydimethyl diallyl ammonium chloride, 20 parts of polyethylene oxide and 3 parts of 2-methyl isothiazolinone, the sludge after heat treatment and the flocculant are mixed and react for 3.5 hours at 45 ℃, the mass ratio of the sludge after heat treatment to the flocculant is 10:0.05, and the dewatered sludge is obtained after dehydration and filtration.
S2: mixing and fermenting the composite bacteria with the mass ratio of 0.1:100 and dehydrated sludge, wherein the fermentation temperature is 50 ℃, the fermentation time is 72 hours, the composite bacteria consist of bacillus stearothermophilus, bacillus subtilis and sarcina spore with the mass ratio of 6:3.5:2, and filtering to obtain the fermented sludge, and the water content of the sludge is 45%.
S3: mixing the fermented sludge with papermaking slurry, wherein the mass ratio of the fermented sludge to the papermaking slurry is 0.8:0.4, the papermaking slurry is cotton fiber and gelatin with the mass ratio of 1:0.07, and the papermaking slurry is prepared into paper.
The paper making method comprises the following steps:
(1) Crushing cotton fibers, and screening by a vibrating screen to obtain short fibers with the length of 0.5-2.5 mm.
(2) Pouring the fermented sludge, short fibers and gelatin into a pulp mixing tank, pulping and pulp mixing, uniformly mixing, pulping with a pulping degree of 80 DEG SR, and pulp mixing to obtain pulp with a concentration of 4.0%.
(3) And (3) feeding the slurry to a high-level box net surface at a spray angle of 45 degrees by using a slurry pump to manufacture paper.
(4) The manufactured layer paper is sent to a roller for winding through a conveying system, and preliminary water removal is carried out through squeezing between the two rollers; the sheet was peeled off the drum after winding 3 to 4 layers.
(5) The separated paper sheet and the water seepage net are alternately layered and sent into a squeezer for mechanical dehydration, and the paper sheet is heated by high-temperature steam at 125 ℃ in the squeezing process, and the water content of the squeezed paper sheet is 10%.
(6) Carrying out calendaring treatment on the heated paper leather, wherein the calendaring temperature is 110 ℃, and the calendaring pressure is 145kg/m 2 The calendaring speed is 12m/min, and the finished product is obtained.
Example 3
S1: the sludge is subjected to heat treatment, wherein the pH value of the sludge is regulated to 10.3, the sludge is heated for 8 hours at 115 ℃, the flocculant comprises 45 parts of nonionic polyacrylamide, 10 parts of polyaluminum chloride, 14 parts of polydimethyl diallyl ammonium chloride, 18.5 parts of polyethylene oxide and 2 parts of 2-methylisothiazolinone, the sludge after heat treatment and the flocculant are mixed and react for 3 hours at 40 ℃, the mass ratio of the sludge after heat treatment to the flocculant is 10:0.04, and the dewatered sludge is obtained through dehydration and filtration.
S2: mixing and fermenting the composite bacteria with the mass ratio of 0.09:100 and dehydrated sludge, wherein the fermentation temperature is 45 ℃, the fermentation time is 65 hours, the composite bacteria consist of bacillus stearothermophilus, bacillus subtilis and sarcina spore with the mass ratio of 5:3.3:1.5, and filtering to prepare the fermented sludge, and the water content of the sludge is 45%.
S3: mixing the fermented sludge with papermaking slurry, wherein the mass ratio of the fermented sludge to the papermaking slurry is 0.7:0.3, the papermaking slurry is cotton fiber and gelatin with the mass ratio of 1:0.06, and the papermaking slurry is prepared into paper.
The paper making method comprises the following steps:
(1) Crushing cotton fibers, and screening by a vibrating screen to obtain short fibers with the length of 0.5-2.5 mm.
(2) Pouring the fermented sludge, short fibers and gelatin into a pulp mixing tank, pulping and pulp mixing, uniformly mixing, pulping at a pulping degree of 70 DEG SR, and mixing to obtain pulp with a concentration of 4.0%.
(3) And (3) feeding the slurry to a high-level box net surface at a spray angle of 45 degrees by using a slurry pump to manufacture paper.
(4) The manufactured layer paper is sent to a roller for winding through a conveying system, and preliminary water removal is carried out through squeezing between the two rollers; the sheet was peeled off the drum after winding 3 layers.
(5) The peeled paper leathers and the water seepage nets are alternately layered and sent to a squeezer for mechanical dehydration, and the paper leathers are heated by high-temperature steam at 120 ℃ in the squeezing process, and the water content of the squeezed paper leathers is 9%.
(6) Carrying out calendaring treatment on the heated paper leather, wherein the calendaring temperature is 105 ℃, and the calendaring pressure is 140kg/m 2 The calendaring speed is 10m/min, and the finished product is obtained.
Comparative example 1
S1: and (3) carrying out heat treatment on the sludge, wherein the heat treatment is carried out to adjust the pH value of the sludge to 10.3, heating the sludge at 115 ℃ for 8 hours, mixing the heat-treated sludge with the flocculant by weight, namely 45 parts of nonionic polyacrylamide and 10 parts of polyaluminium chloride, reacting the heat-treated sludge with the flocculant at 40 ℃ for 3 hours, wherein the mass ratio of the heat-treated sludge to the flocculant is 10:0.04, dehydrating, and filtering to obtain dehydrated sludge.
S2: mixing and fermenting the composite bacteria with the mass ratio of 0.09:100 and dehydrated sludge, wherein the fermentation temperature is 45 ℃, the fermentation time is 65 hours, the composite bacteria consist of bacillus stearothermophilus, bacillus subtilis and sarcina spore with the mass ratio of 5:3.3:1.5, and filtering to prepare the fermented sludge, and the water content of the sludge is 45%.
S3: mixing the fermented sludge with papermaking slurry, wherein the mass ratio of the fermented sludge to the papermaking slurry is 0.7:0.3, the papermaking slurry is cotton fiber and gelatin with the mass ratio of 1:0.06, and the papermaking slurry is prepared into paper.
The paper making method comprises the following steps:
(1) Crushing cotton fibers, and screening by a vibrating screen to obtain short fibers with the length of 0.5-2.5 mm.
(2) Pouring the fermented sludge, short fibers and gelatin into a pulp mixing tank, pulping and pulp mixing, uniformly mixing, pulping at a pulping degree of 70 DEG SR, and mixing to obtain pulp with a concentration of 4.0%.
(3) And (3) feeding the slurry to a high-level box net surface at a spray angle of 45 degrees by using a slurry pump to manufacture paper.
(4) The manufactured layer paper is sent to a roller for winding through a conveying system, and preliminary water removal is carried out through squeezing between the two rollers; the sheet was peeled off the drum after winding 3 layers.
(5) The peeled paper leathers and the water seepage nets are alternately layered and sent to a squeezer for mechanical dehydration, and the paper leathers are heated by high-temperature steam at 120 ℃ in the squeezing process, and the water content of the squeezed paper leathers is 9%.
(6) Carrying out calendaring treatment on the heated paper leather, wherein the calendaring temperature is 105 ℃, and the calendaring pressure is 140kg/m 2 The calendaring speed is 10m/min, and the finished product is obtained.
Comparative example 2
S1: the sludge is subjected to heat treatment, wherein the pH value of the sludge is regulated to 10.3, the sludge is heated for 8 hours at 115 ℃, the flocculant comprises 45 parts of nonionic polyacrylamide, 10 parts of polyaluminum chloride, 14 parts of polydimethyl diallyl ammonium chloride, 18.5 parts of polyethylene oxide and 2 parts of 2-methylisothiazolinone, the sludge after heat treatment and the flocculant are mixed and react for 3 hours at 40 ℃, the mass ratio of the sludge after heat treatment to the flocculant is 10:0.04, and the dewatered sludge is obtained through dehydration and filtration.
S2: mixing and fermenting the composite bacteria with the mass ratio of 0.09:100 and dehydrated sludge, wherein the fermentation temperature is 45 ℃, the fermentation time is 65 hours, the composite bacteria consist of bacillus megatherium, streptomyces griseus and candida tropicalis with the mass ratio of 5:3:2, and filtering to obtain the fermented sludge with the water content of 45 percent.
S3: mixing the fermented sludge with papermaking slurry, wherein the mass ratio of the fermented sludge to the papermaking slurry is 0.7:0.3, the papermaking slurry is cotton fiber and gelatin with the mass ratio of 1:0.06, and the papermaking slurry is prepared into paper.
The paper making method comprises the following steps:
(1) Crushing cotton fibers, and screening by a vibrating screen to obtain short fibers with the length of 0.5-2.5 mm.
(2) Pouring the fermented sludge, short fibers and gelatin into a pulp mixing tank, pulping and pulp mixing, uniformly mixing, pulping at a pulping degree of 70 DEG SR, and mixing to obtain pulp with a concentration of 4.0%.
(3) And (3) feeding the slurry to a high-level box net surface at a spray angle of 45 degrees by using a slurry pump to manufacture paper.
(4) The manufactured layer paper is sent to a roller for winding through a conveying system, and preliminary water removal is carried out through squeezing between the two rollers; the sheet was peeled off the drum after winding 3 layers.
(5) The peeled paper leathers and the water seepage nets are alternately layered and sent to a squeezer for mechanical dehydration, and the paper leathers are heated by high-temperature steam at 120 ℃ in the squeezing process, and the water content of the squeezed paper leathers is 9%.
(6) Carrying out calendaring treatment on the heated paper leather, wherein the calendaring temperature is 105 ℃, and the calendaring pressure is 140kg/m 2 The calendaring speed is 10m/min, and the finished product is obtained.
Test example 1
The properties of the finished papers obtained in examples 1-3 and comparative examples 1-2 were examined, and the papers obtained in examples 1-3 and comparative examples 1-2 were each 1.80mm thick, and the tightness and the stiffness in the cross direction of the papers were examined with reference to GB/T13024-2003.
| Name of the name | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 |
| Tightness (g/m) 3 ) | 1.03 | 0.98 | 1.07 | 0.81 | 0.88 |
| Stiffness in transverse direction (mN.m) | 314 | 312 | 321 | 296 | 305 |
Experimental results show that the sludge treatment method can improve the quality of finished paper. The components of the flocculant are adjusted in comparative example 1, so that the effect of removing impurities in the sludge by the flocculant is reduced, and the produced sludge contains excessive impurities, so that the quality of paper is reduced. In comparative example 2, the composition of the composite bacterial strain was adjusted, resulting in a decrease in the fermentation effect of the sludge, insufficient removal of organic matters, impurities and the like, and a decrease in the performance of the produced paper.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. A method for papermaking by using recycled sludge, comprising the steps of:
s1: carrying out heat treatment on sludge, mixing the sludge subjected to heat treatment with a flocculating agent, dehydrating, and filtering to obtain dehydrated sludge, wherein the flocculating agent comprises nonionic polyacrylamide, polyaluminium chloride, polydimethyl diallyl ammonium chloride, polyethylene oxide and 2-methylisothiazolinone;
s2: mixing and fermenting the dehydrated sludge and composite bacteria, and filtering to obtain fermented sludge, wherein the composite bacteria comprise bacillus stearothermophilus, bacillus subtilis and sarcina sporophore;
s3: mixing the fermented sludge with papermaking slurry to prepare the paper.
2. The method for papermaking by using recycled sludge as claimed in claim 1, wherein in the step S1, the heat treatment is to adjust the pH of the sludge to 10 to 10.5 and heat at 110 to 120 ℃ for 7 to 9 hours.
3. The method for papermaking by using recycled sludge as claimed in claim 1, wherein in the step S1, the flocculant comprises, by weight, 40-50 parts of nonionic polyacrylamide, 8-12 parts of polyaluminum chloride, 13-15 parts of polydimethyldiallylammonium chloride, 17-20 parts of polyethylene oxide and 1-3 parts of 2-methylisothiazolinone.
4. The method for papermaking by using recycled sludge as claimed in claim 1, wherein in the step S1, the heat-treated sludge and the flocculant are mixed and reacted at 37-45 ℃ for 2.5-3.5 hours, and the mass ratio of the heat-treated sludge to the flocculant is 10:0.03-0.05.
5. The method for papermaking by using recycled sludge according to claim 1, wherein in the step S2, the mass ratio of bacillus stearothermophilus, bacillus subtilis and sarcina bacillus is 4-6:3-3.5:1-2.
6. The method for papermaking by using recycled sludge as claimed in claim 1, wherein in the step S2, the mass ratio of the complex bacteria to the dehydrated sludge is 0.07-0.1:100.
7. The method for papermaking by using recycled sludge as claimed in claim 1, wherein in the step S2, the fermentation temperature of the composite bacteria and the dehydrated sludge is 45-50 ℃ and the fermentation time is 60-72h.
8. The method for papermaking by using recycled sludge according to claim 1, wherein in the step S3, the mass ratio of the fermented sludge to papermaking slurry is 0.6-0.8:0.1-0.4, wherein the papermaking slurry is cotton fiber and gelatin with a mass ratio of 1:0.05-0.07.
9. The method for making paper using recycled sludge as claimed in claim 1, wherein the making method of the paper comprises the steps of:
(1) Crushing cotton fibers, and screening by a vibrating screen to obtain short fibers with the length of 0.5-2.5 mm;
(2) Pouring the fermented sludge, short fibers and gelatin into a pulp mixing tank, pulping and pulp mixing, uniformly mixing, pulping by using an SR with the pulping degree of 70-80 degrees, and mixing to obtain pulp with the concentration of 3.5-4.0 percent;
(3) Feeding the slurry to a high-level box net surface at a spray angle of 45 degrees by a slurry pump for papermaking;
(4) The manufactured layer paper is sent to a roller for winding through a conveying system, and preliminary water removal is carried out through squeezing between the two rollers; peeling off the paper sheet from the roller after winding 3-4 layers;
(5) The separated leathers and the water seepage net are spread in staggered layers and sent into a squeezer for mechanical dehydration, the leathers are heated by high-temperature steam at 115-125 ℃ in the squeezing process, and the water content of the leathers after squeezing is 8-10%;
(6) And (3) carrying out calendaring treatment on the heated paper leather, wherein the calendaring temperature is 100-110 ℃, the calendaring pressure is 135-145 kg/square meter, and the calendaring speed is 8-12m/min, so as to obtain a finished product.
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| CN106007257A (en) * | 2016-07-29 | 2016-10-12 | 福建省联盛纸业有限责任公司 | Sludge recovery and paper making method |
| CN107881843A (en) * | 2017-10-18 | 2018-04-06 | 建宁县恒源节能环保科技有限公司 | The manufacture craft of cardboard is made using paper mill sludge |
| CN114214227A (en) * | 2021-12-01 | 2022-03-22 | 山东尚科环境工程有限公司 | Microbial agent for municipal sludge drying treatment and preparation method thereof |
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| WO2001087782A1 (en) * | 2000-05-18 | 2001-11-22 | Ibiden Co., Ltd. | Paper-making sludge treating method and paper-making treating device |
| US20020043505A1 (en) * | 2000-10-13 | 2002-04-18 | Fkc Co., Ltd. | Sludge dewatering and pasteurization system and method |
| CN101649573A (en) * | 2009-08-27 | 2010-02-17 | 福建省晋江优兰发纸业有限公司 | Leatheroid manufactured by papermaking sewage and cotton fibre and method thereof |
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