CN115254025B - Preparation method of printing and dyeing sludge dehydrating agent and method for conditioning printing and dyeing sludge by using same - Google Patents
Preparation method of printing and dyeing sludge dehydrating agent and method for conditioning printing and dyeing sludge by using same Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 105
- 238000004043 dyeing Methods 0.000 title claims abstract description 60
- 239000012024 dehydrating agents Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims description 7
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims abstract description 25
- 235000011613 Pinus brutia Nutrition 0.000 claims abstract description 25
- 241000018646 Pinus brutia Species 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 25
- 238000001035 drying Methods 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 19
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002023 wood Substances 0.000 claims abstract description 14
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 13
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 12
- 239000011029 spinel Substances 0.000 claims abstract description 12
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003610 charcoal Substances 0.000 claims abstract description 8
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000007873 sieving Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 22
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000000706 filtrate Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 238000001354 calcination Methods 0.000 claims description 7
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 5
- 238000000498 ball milling Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 5
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 239000010865 sewage Substances 0.000 claims description 4
- 239000004753 textile Substances 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 abstract description 9
- 238000006297 dehydration reaction Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 3
- 239000012065 filter cake Substances 0.000 abstract 1
- 230000001737 promoting effect Effects 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000001143 conditioned effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 125000002091 cationic group Chemical group 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3021—Milling, crushing or grinding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
-
- 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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
-
- 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
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of environmental treatment, and provides a method for preparing a printing and dyeing sludge dehydrating agent and conditioning the printing and dyeing sludge. Preparing pine wood charcoal under a certain condition, and preparing mixed particles by taking graphene oxide, magnesium chloride and aluminum oxide as raw materials; pine biochar and mixed particles are used as raw materials; adding acrylamide for grafting, and drying to obtain black powder; and mixing and grinding the black powder and the spinel powder, and sieving to obtain the printing and dyeing sludge dehydrating agent. And conditioning the printing and dyeing sludge by the prepared printing and dyeing sludge dehydrating agent, and improving the sludge dehydration performance. The sludge dehydrating agent can effectively improve the dehydration performance of sludge, the water content of a sludge filter cake is reduced to 73.59% -79.55%, and the specific resistance of the sludge is reduced by 34.25% -72.21%. Meanwhile, the raw material of the printing and dyeing sludge dehydrating agent is agriculture and forestry leftover materials, and the method has important significance for solving the environmental pollution and promoting the recycling of wastes.
Description
Technical Field
The invention relates to the technical field of environmental treatment, in particular to a method for preparing a printing and dyeing sludge dehydrating agent and conditioning the printing and dyeing sludge.
Background
With the industrial upgrading and the improvement of living standard, a large amount of municipal wastewater and industrial wastewater is discharged, and the number and scale of national sewage treatment plants are continuously increasing and expanding. As a traditional prop industry in China, the printing and dyeing industry generates a large amount of excess sludge in the process of textile printing and dyeing production. Printing and dyeing sludge belongs to industrial solid waste, some even dangerous solid waste, and therefore, the treatment and disposal of the printing and dyeing sludge is difficult. Sludge dewatering is an important part of sludge treatment, and printing and dyeing sludge contains a large amount of water and is huge in volume, so that the subsequent treatment and disposal are greatly influenced, and sludge conditioning is needed to improve the dewatering performance of the printing and dyeing sludge.
Taiming green, sun Tao, yellow snow, ji Xianjun ultrasonic Fenton cooperates with PAM to improve the dewatering performance of sludge [ J ]. Fujian university journal (natural science edition), 2021,37 (02): 66-74. And Feng Li, zhengHuaili, gaoBaoyu, zhaoChuanliang, zhangShixin, chen nan. Enhancement of text-dyeing sludge dewaterability using a novel cationic polyacrylamide: role of cationic block structures [ J ]. RSC Advances,2017,7 (19). A conventional sludge conditioning method has the problems of breaking sludge and flocculating sludge, and both methods can improve the dewatering performance of sludge, but in the dewatering process, the sludge cake becomes more and more dense, preventing further removal of water in the sludge cake. Research shows that by adding framework particles, the sludge cake keeps porous in the dehydration process to form a hydrophobic channel, so that the dehydration performance of the sludge is improved.
Common sludge conditioning agents (framework particles) are: fly ash, lignite, wood dust, rice hull powder, biochar and the like. The pine wood charcoal material contains a large amount of carbon elements, has good porosity and adsorption performance, and contains a large amount of silicon elements, so that the pine wood charcoal material has a firm structure and the potential of being used as skeleton particles for conditioning the dehydration of printing and dyeing sludge. However, the surface of the original pine biochar has negative charges, and the original pine biochar cannot be effectively combined with a sludge system influencing electronegativity after being singly added, so that the dewatering performance of the printing and dyeing sludge is not obviously improved, and a sludge dewatering agent is usually prepared by a combined chemical method. Therefore, a printing and dyeing sludge dehydrating agent with simple process, high economic benefit and good effect is necessary to be researched.
Disclosure of Invention
The invention aims to overcome the defects of the existing sludge conditioning technology and provide the printing and dyeing sludge dehydrating agent which is simple in process, high in economic benefit and good in effect.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the preparation method of the printing and dyeing sludge dehydrating agent comprises the following steps of;
(1) Calcining pine wood blocks under the protection of nitrogen, naturally cooling the calcined residual solids, flushing the calcined residual solids with distilled water for a plurality of times until the pH value of the filtrate is neutral, and placing the filtrate in a blast drying oven to dry at 80 ℃ to obtain pine wood biochar;
(2) Mixing the mixed particles, pine charcoal and hydrochloric acid solution according to a solid-liquid ratio of 1:20 adding the mixture into a container, stirring for 2 hours, regulating the temperature of the system to 70 ℃, adding acrylamide in the stirring process to obtain a mixture solution, drying the mixture, and grinding to obtain black powder;
(3) Mixing the black powder obtained in the step (2) with spinel powder according to a mass ratio of 10-20:1, sieving to obtain the printing and dyeing sludge dehydrating agent.
The calcining temperature in the step (1) is 760 ℃ and the time is 2h.
The preparation method of the mixed particles in the step (2) comprises the steps of ball milling graphene oxide, and mixing the ball-milled graphene oxide, magnesium chloride and aluminum oxide according to a solid-liquid ratio of 1:20 is added into 3mol/L ferric chloride solution and is subjected to ultrasonic mixing, and then filtering, collecting residues, washing and drying are carried out to obtain mixed particles.
The mass ratio of the ball-milled graphene oxide to the magnesium chloride to the aluminum oxide is 3-4:2:2.
The mass concentration of the hydrochloric acid solution adopted in the step (2) is 15-37%.
The mass ratio of the mixed particles to the pine biochar in the step (2) is (6-10): (110-115), the mass ratio of the acrylamide to the pine biochar is 0.5-0.7:1.
the spinel powder in the step (3) is one of magnesia-spinel powder and alumina-spinel powder.
The method for conditioning the printing and dyeing sludge by the prepared printing and dyeing sludge dehydrating agent comprises the steps of adding the printing and dyeing sludge dehydrating agent with the dry weight of 10% -70% of the sludge into the printing and dyeing sludge, firstly, rapidly stirring for 2min at the rotating speed of 220-240rpm, then slowly stirring for 10min at the rotating speed of 60-90rpm, and then filtering and dehydrating. The printing and dyeing sludge is aerobic sludge of a textile industry garden sewage treatment plant, the pH value is 6-9, and the water content is 85-98%. The filtration pressure was 0.03MPa.
The printing and dyeing sludge dehydrating agent disclosed by the invention has the beneficial effects that the dehydrating performance of printing and dyeing sludge can be effectively improved, compared with original sludge, the water content of a sludge cake is reduced to 73.59% -79.55%, the specific resistance of the sludge is reduced by 34.25% -72.21%, and the net yield of the sludge is improved by 1.79-4.21 times. And no flocculant is required to be added, so that the method has the advantages of simple process, strong practicability and the like, and has important significance in solving the environmental pollution and realizing the sludge reduction.
Drawings
FIG. 1 is a graph showing the effect of a printing sludge dewatering agent conditioning printing sludge on dewatering performance;
FIG. 2 is a graph showing the effect of a dye sludge dewatering agent conditioning dye sludge on the net yield of sludge.
Detailed Description
Example 1
1) Calcining a certain amount of pine wood blocks at 760 ℃ under nitrogen protection for 2 hours, naturally cooling the calcined residual solids, flushing the calcined residual solids with distilled water for a plurality of times until the pH value of the filtrate is neutral, and drying the filtrate in a blast drying oven at 80 ℃ to obtain pine wood biochar.
2) Ball milling is carried out on graphene oxide, and the ball milled graphene oxide, magnesium chloride and aluminum oxide are mixed according to the mass ratio of 4:2:2, adding the solid-liquid ratio of 1:20 into 3mol/L ferric chloride solution, carrying out ultrasonic mixing, and then filtering, collecting residues, washing and drying to obtain mixed particles.
3) Adding the mixed particles and pine charcoal into 37% hydrochloric acid solution with a mass ratio of 6:110 and a solid-liquid ratio of 1:20, stirring in a container for 2h, regulating the temperature of the system to 70 ℃, and adding acrylamide with a mass ratio of 0.5 in the stirring process: 1, drying and grinding the mixture to obtain black powder.
4) Uniformly mixing the black powder and the magnesia spinel powder according to the mass ratio of 10:1, and sieving to obtain the printing and dyeing sludge dehydrating agent.
Example 2
1) Calcining a certain amount of pine wood blocks at 760 ℃ under nitrogen protection for 2 hours, naturally cooling the calcined residual solids, flushing the calcined residual solids with distilled water for a plurality of times until the pH value of the filtrate is neutral, and drying the filtrate in a blast drying oven at 80 ℃ to obtain pine wood biochar.
2) Ball milling is carried out on graphene oxide, and the ball milled graphene oxide, magnesium chloride and aluminum oxide are mixed according to the mass ratio of 3:2:2, adding the solid-liquid ratio of 1:20 into 3mol/L ferric chloride solution, carrying out ultrasonic mixing, and then filtering, collecting residues, washing and drying to obtain mixed particles.
3) Adding the mixed particles and pine charcoal into 37% hydrochloric acid solution with a mass ratio of 6:110 and a solid-liquid ratio of 1:20, stirring in a container for 2h, regulating the temperature of the system to 70 ℃, and adding acrylamide with a mass ratio of 0.7 in the stirring process: 1, drying and grinding the mixture to obtain black powder.
4) Uniformly mixing the black powder and the magnesia spinel powder according to the mass ratio of 10:1, and sieving to obtain the printing and dyeing sludge dehydrating agent.
Example 3
1) Calcining a certain amount of pine wood blocks at 760 ℃ under nitrogen protection for 2 hours, naturally cooling the calcined residual solids, flushing the calcined residual solids with distilled water for a plurality of times until the pH value of the filtrate is neutral, and drying the filtrate in a blast drying oven at 80 ℃ to obtain pine wood biochar.
2) Ball milling is carried out on graphene oxide, and the ball milled graphene oxide, magnesium chloride and aluminum oxide are mixed according to the mass ratio of 4:2:2, adding the solid-liquid ratio of 1:20 into 3mol/L ferric chloride solution, carrying out ultrasonic mixing, and then filtering, collecting residues, washing and drying to obtain mixed particles.
3) Adding mixed particles and pine charcoal into 37% hydrochloric acid solution with a mass ratio of 10:115 and a solid-liquid ratio of 1:20, stirring in a container for 2h, regulating the temperature of the system to 70 ℃, and adding acrylamide with a mass ratio of 0.7 in the stirring process: 1, drying and grinding the mixture to obtain black powder.
4) Uniformly mixing the black powder and the magnesia spinel powder according to the mass ratio of 10:1, and sieving to obtain the printing and dyeing sludge dehydrating agent.
The sludge-dewatering agent prepared in example 1 was used to carry out the conditioning treatment of the printing sludge in examples 4 to 7 below, and the printing sludge used in examples 4 to 7 was obtained from a sewage treatment plant in textile industry, WUZHONG, jiangsu province, and the raw sludge water content was 98.92.+ -. 0.60%.
Example 4
Taking a certain amount of printing and dyeing sludge, adding a printing and dyeing sludge dehydrating agent with the dry weight of 10% of the sludge, firstly rapidly stirring for 2min at the rotating speed of 240rpm, and then slowly stirring for 10min at the rotating speed of 60rpm. The filtration and dehydration were then carried out at a pressure of 0.03MPa, with the following results: after being conditioned by the printing and dyeing sludge dehydrating agent, the water content of a mud cake is reduced from 85.22% to 79.55% compared with the original printing and dyeing sludge, and the specific resistance of the mud is 4.50 multiplied by 10 11 m·kg -1 Down to 2.96×10 11 m·kg -1 The net yield of the sludge is 0.48kg (m 2 h) -1 Up to 0.85kg (m) 2 h) -1 。
Example 5
Taking a certain amount of printing and dyeing sludge, adding a printing and dyeing sludge dehydrating agent with the dry weight of 40% of the sludge, firstly rapidly stirring for 2min at the rotating speed of 240rpm, and then slowly stirring for 10min at the rotating speed of 60rpm. The filtration and dehydration were then carried out at a pressure of 0.03MPa, with the following results: after being conditioned by the dehydrating agent of the printing and dyeing sludge, the water content of a mud cake is reduced from 85.22 percent to 76.26 percent compared with the original printing and dyeing sludge, and the specific resistance of the mud is 4.50 multiplied by 10 11 m·kg -1 Down to 2.23×10 11 m·kg -1 The net yield of the sludge is 0.48kg (m 2 h) -1 Up to 1.22kg (m) 2 h) -1 。
Example 6
Taking a certain amount of printing and dyeing sludge, adding 50% of the dry weight of the sludge into the printing and dyeing sludge dehydrating agent, rapidly stirring for 2min at the rotating speed of 240rpm, and slowly stirring for 10min at the rotating speed of 60rpm. The filtration and dehydration were then carried out at a pressure of 0.03MPa, with the following results: after being conditioned by the printing and dyeing sludge dehydrating agent, the water content of a mud cake is reduced from 85.22% to 75.13% compared with the original printing and dyeing sludge, and the specific resistance of the mud is 4.50 multiplied by 10 11 m·kg -1 Down to 1.89×10 11 m·kg -1 The net yield of the sludge is 0.48kg (m 2 h) -1 Up to 1.36kg (m) 2 h) -1 。
Example 7
Taking a certain amount of printing and dyeing sludge, adding 70% of dry weight of the sludge into the printing and dyeing sludge dehydrating agent, rapidly stirring for 2min at the rotating speed of 240rpm, and slowly stirring for 10min at the rotating speed of 60rpm. The filtration and dehydration were then carried out at a pressure of 0.03MPa, with the following results: after being conditioned by the printing and dyeing sludge dehydrating agent, the water content of a mud cake is reduced from 85.22% to 73.59% compared with the original printing and dyeing sludge, and the specific resistance of the mud is 4.50 multiplied by 10 11 m·kg -1 Down to 1.25X10 11 m·kg -1 The net yield of the sludge is 0.48kg (m 2 h) -1 Up to 2.01kg (m) 2 h) -1 。
Claims (4)
1. The preparation method of the printing and dyeing sludge dehydrating agent is characterized by comprising the following steps of;
(1) Calcining pine wood blocks under the protection of nitrogen, naturally cooling the calcined residual solids, flushing the calcined residual solids with distilled water for a plurality of times until the pH value of the filtrate is neutral, and placing the filtrate in a blast drying oven to dry at 80 ℃ to obtain pine wood biochar; the calcination temperature is 760 ℃ and the time is 2 hours;
(2) Mixing the mixed particles, pine charcoal and hydrochloric acid solution according to a solid-liquid ratio of 1:20 adding the mixture into a container, stirring for 2 hours, regulating the temperature of the system to 70 ℃, adding acrylamide in the stirring process to obtain a mixture solution, drying the mixture, and grinding to obtain black powder;
the preparation method of the mixed particles comprises the steps of ball milling graphene oxide, and mixing the ball-milled graphene oxide, magnesium chloride and aluminum oxide in a solid-to-liquid ratio of 1:20 adding the mixture into 3mol/L ferric chloride solution, carrying out ultrasonic mixing, filtering, collecting residues, washing and drying to obtain mixed particles; the mass ratio of the ball-milled graphene oxide to the magnesium chloride to the aluminum oxide is 3-4:2:2;
the mass ratio of the mixed particles to the pine biochar is (6-10): (110-115), the mass ratio of the acrylamide to the pine biochar is 0.5-0.7:1, a step of;
(3) Mixing the black powder obtained in the step (2) with spinel powder according to a mass ratio of 10-20:1, after uniform mixing, sieving to obtain a printing and dyeing sludge dehydrating agent; the spinel powder is one of magnesia-spinel powder and alumina-spinel powder.
2. The method for preparing a dehydrating agent for printing and dyeing sludge according to claim 1, wherein the mass concentration of the hydrochloric acid solution adopted in the step (2) is 15-37%.
3. The method for conditioning the printing and dyeing sludge by the printing and dyeing sludge dehydrating agent prepared by the preparation method according to claim 1 or 2, which is characterized in that the printing and dyeing sludge dehydrating agent with the dry weight of 10% -70% of the sludge is added into the printing and dyeing sludge, and is subjected to rapid stirring for 2min at the rotating speed of 220-240rpm, then slow stirring for 10min at the rotating speed of 60-90rpm, and then filtering and dehydrating.
4. A method of conditioning printing and dyeing sludge according to claim 3 characterized in that the printing and dyeing sludge is an aerobic sludge of a textile industrial park sewage treatment plant, the pH is 6-9 and the water content is 85-98%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210997778.9A CN115254025B (en) | 2022-08-19 | 2022-08-19 | Preparation method of printing and dyeing sludge dehydrating agent and method for conditioning printing and dyeing sludge by using same |
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| JPH06135714A (en) * | 1992-10-29 | 1994-05-17 | Nippon Light Metal Co Ltd | Easily sinterable alumina and its production |
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| CN107459250A (en) * | 2017-09-25 | 2017-12-12 | 常州苏通海平机电科技有限公司 | A kind of preparation method of sewage dehydrating agent |
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| CN112159074A (en) * | 2020-09-29 | 2021-01-01 | 安徽省融工博大环保技术材料研究院有限公司 | Rapid sludge dewatering system and dewatering method |
| CN112246243A (en) * | 2020-10-20 | 2021-01-22 | 哈尔滨理工大学 | Preparation method of hydrophilic graphene/spinel type ferrite composite material |
| CN112794599A (en) * | 2020-12-29 | 2021-05-14 | 同济大学 | Method for catalyzing ozone to strengthen sludge dehydration by using sludge derived biochar |
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| JPH06135714A (en) * | 1992-10-29 | 1994-05-17 | Nippon Light Metal Co Ltd | Easily sinterable alumina and its production |
| CN104801271A (en) * | 2015-04-14 | 2015-07-29 | 湖南大学 | Method for preparing modified rice hull biochar and conditioning urban sludge through modified rice hull biochar |
| CN107459250A (en) * | 2017-09-25 | 2017-12-12 | 常州苏通海平机电科技有限公司 | A kind of preparation method of sewage dehydrating agent |
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