CN115254025A - Preparation method of printing and dyeing sludge dehydrating agent and method for conditioning printing and dyeing sludge by using printing and dyeing sludge dehydrating agent - Google Patents
Preparation method of printing and dyeing sludge dehydrating agent and method for conditioning printing and dyeing sludge by using printing and dyeing sludge dehydrating agent Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 115
- 238000004043 dyeing Methods 0.000 title claims abstract description 65
- 239000012024 dehydrating agents Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims description 12
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims abstract description 26
- 235000011613 Pinus brutia Nutrition 0.000 claims abstract description 26
- 241000018646 Pinus brutia Species 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 25
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 13
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 13
- 239000003610 charcoal Substances 0.000 claims abstract description 12
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 12
- 239000011029 spinel Substances 0.000 claims abstract description 12
- 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
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000007873 sieving Methods 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000002023 wood Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 239000000706 filtrate Substances 0.000 claims description 6
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 5
- 238000007605 air drying Methods 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
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 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
- 239000007787 solid Substances 0.000 claims description 5
- 239000010865 sewage Substances 0.000 claims description 4
- 239000004753 textile Substances 0.000 claims description 4
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 2
- 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
- 230000000694 effects Effects 0.000 description 5
- 230000001143 conditioned effect Effects 0.000 description 4
- 230000008901 benefit Effects 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
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation 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
- 238000011160 research Methods 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
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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
- B01J20/02—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
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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
- B01J20/02—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
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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
- B01J20/02—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
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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
- B01J20/02—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
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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
- B01J20/3021—Milling, crushing or grinding
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- 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
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- 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
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- 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
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- 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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- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of environmental management and provides a method for preparing a printing and dyeing sludge dehydrating agent and conditioning printing and dyeing sludge by using the same. Preparing pine charcoal under certain conditions, and preparing mixed particles by using graphene oxide, magnesium chloride and aluminum oxide as raw materials; pine charcoal and mixed particles are used as raw materials; adding acrylamide for grafting, and drying to obtain black powder; and then mixing and grinding the black powder and the spinel powder, and sieving to obtain the printing and dyeing sludge dehydrating agent. The prepared printing and dyeing sludge dehydrating agent is used for conditioning printing and dyeing sludge and improving the sludge dehydrating performance. The sludge dehydrating agent can effectively improve the dehydration performance of the 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 agricultural and forestry leftover materials, and the method has important significance for solving environmental pollution and promoting waste recycling.
Description
Technical Field
The invention relates to the technical field of environmental management, in particular to a preparation method of a printing and dyeing sludge dehydrating agent and a method for conditioning printing and dyeing sludge by using the same.
Background
Along with the upgrading of industries and the improvement of living standards, a large amount of municipal wastewater and industrial wastewater is discharged, and the number and scale of sewage treatment plants in the country are increasing and expanding. As the traditional strut industry in China, the printing and dyeing industry generates a large amount of excess sludge in the process of textile printing and dyeing production. The printing and dyeing sludge belongs to industrial solid waste, and some even belong to dangerous solid waste, so the treatment and disposal tasks of the printing and dyeing sludge are difficult. Sludge dewatering is an important part of sludge treatment, and printing and dyeing sludge contains a large amount of water and has a large volume, so that the subsequent treatment and disposal are greatly influenced, and the dewatering performance of the printing and dyeing sludge needs to be improved through sludge conditioning.
Taiming blue, grandtao, huangxue, junxian.ultrasonic Fenton in cooperation with PAM improves sludge dewatering performance [ J ]. Fujian university journal (Nature science edition), 2021,37 (02): 66-74. And Feng Li, zhengHuaili, gaoBaoyu, zhaoChuanlianlianlian, zhangShixin, chen nan. Engineering of textile-dynamic sludge dewatering using a novel cationic polyacrylamide: roll of cationic block structures [ J ]. RSC Advances,2017, 19. Conventional sludge conditioning methods have been disclosed as a method of dense sludge breaking and sludge flocculation, and both methods can improve sludge dewatering performance, but sludge cakes become more and more water in sludge cakes during dewatering, preventing further sludge dewatering. Researches show that by adding the skeleton particles, the sludge cake keeps porosity in the dehydration process to form a hydrophobic channel, so that the dehydration performance of the sludge is improved.
Commonly used sludge conditioners (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 also contains a large amount of silicon elements, so the pine wood charcoal material has a firm structure and has the potential of conditioning printing and dyeing sludge dehydration as skeleton particles. However, the surface of the original pine biochar is negatively charged, and after the pine biochar is singly added, a negatively charged sludge system cannot be effectively formed, the improvement effect on the dehydration performance of the printing and dyeing sludge is not obvious, and a sludge dehydrating agent is generally prepared by a combined chemical method. Therefore, a dyeing sludge dehydrating agent with simple process, high economic benefit and good effect needs 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 with simple process, high economic benefit and good effect.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of a printing and dyeing sludge dehydrating agent comprises the following steps;
(1) Calcining pine blocks under the protection of nitrogen, naturally cooling the calcined residual solid, washing with distilled water for multiple times until the pH of the filtrate is neutral, placing in a forced air drying oven, and drying at 80 deg.C to obtain pine charcoal;
(2) Mixing the mixed particles, the pine charcoal and a hydrochloric acid solution according to a solid-to-liquid ratio of 1:20, adding the mixture into a container, stirring for 2 hours, adjusting the temperature of the system to 70 ℃, adding acrylamide in the stirring process to obtain a mixture solution, drying and grinding the mixture to obtain black powder;
(3) Mixing the black powder obtained in the step (2) with the spinel powder according to a mass ratio of 10-20:1, and sieving to obtain the printing and dyeing sludge dehydrating agent.
The calcination 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 in a solid-to-liquid ratio of 1:20 is added into 3mol/L ferric chloride solution and is subjected to ultrasonic mixing, and then filtering, residue collection, 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.
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 charcoal in the step (2) is (6-10): (110-115), wherein the mass ratio of the acrylamide to the pine biochar is 0.5-0.7:1.
and (3) the spinel powder in the step (3) is one of magnesium iron spinel powder and aluminum iron spinel powder.
The method for conditioning the printing and dyeing sludge by using the printing and dyeing sludge dehydrating agent comprises the steps of adding 10-70% of the printing and dyeing sludge dehydrating agent by dry weight of sludge into the printing and dyeing sludge, quickly 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 sewage treatment plant in a textile industry park, the pH is 6-9, and the water content is 85-98%. The filtration pressure was 0.03MPa.
The printing and dyeing sludge dehydrating agent has the beneficial effects that the dehydrating performance of printing and dyeing sludge can be effectively improved, compared with the original sludge, the moisture content of sludge cakes 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 any flocculating agent is not required to be added, so the method has the advantages of simple process, strong practicability and the like, and has important significance for solving the environmental pollution and realizing the sludge reduction.
Drawings
FIG. 1 is a graph showing the effect of conditioning printing sludge with a printing sludge dewatering agent on dewatering performance;
FIG. 2 shows the effect of printing sludge dewatering agent conditioning of printing sludge on sludge net yield.
Detailed Description
Example 1
1) Calcining a certain amount of pine blocks at 760 ℃ for 2h under the protection of nitrogen, naturally cooling the calcined residual solid, washing with distilled water for multiple times until the pH of the filtrate is neutral, placing in a forced air drying oven, and drying at 80 ℃ to obtain the pine charcoal.
2) Carrying out ball milling on graphene oxide, and mixing the ball-milled graphene oxide, magnesium chloride and aluminum oxide according to a mass ratio of 4:2: and 2, adding the mixture into a 3mol/L ferric chloride solution at a solid-to-liquid ratio of 1.
3) Adding the mixed particles and the pine wood biochar into a hydrochloric acid solution with the mass fraction of 37% according to a mass ratio of 6:1, drying and grinding the mixture to obtain black powder.
4) Uniformly mixing black powder and magnesium iron spinel powder according to a mass ratio of 10.
Example 2
1) Calcining a certain amount of pine blocks at 760 ℃ for 2h under the protection of nitrogen, naturally cooling the calcined residual solid, washing with distilled water for multiple times until the pH of the filtrate is neutral, placing the filtrate in a forced air drying oven, and drying at 80 ℃ to obtain the pine charcoal.
2) Carrying out ball milling on graphene oxide, and mixing the ball-milled graphene oxide, magnesium chloride and aluminum oxide according to a mass ratio of 3:2: and 2, adding the mixture into a 3mol/L ferric chloride solution at a solid-to-liquid ratio of 1.
3) Adding the mixed particles and the pine wood biochar into a hydrochloric acid solution with the mass fraction of 37% according to a mass ratio of 6 to 110, stirring the mixture in a container for 2 hours, adjusting the temperature of the system to 70 ℃, and adding acrylamide in the stirring process, wherein the mass ratio of the acrylamide to the pine wood biochar is 0.7:1, drying and grinding the mixture to obtain black powder.
4) Uniformly mixing black powder and magnesium iron spinel powder according to a mass ratio of 10.
Example 3
1) Calcining a certain amount of pine blocks at 760 ℃ for 2h under the protection of nitrogen, naturally cooling the calcined residual solid, washing with distilled water for multiple times until the pH of the filtrate is neutral, placing in a forced air drying oven, and drying at 80 ℃ to obtain the pine charcoal.
2) Carrying out ball milling on graphene oxide, and mixing the ball-milled graphene oxide, magnesium chloride and aluminum oxide according to a mass ratio of 4:2: and 2, adding the mixture into a 3mol/L ferric chloride solution at a solid-to-liquid ratio of 1.
3) Adding the mixed particles and the pine wood biochar into a hydrochloric acid solution with the mass fraction of 37% according to a mass ratio of 10:1, drying and grinding the mixture to obtain black powder.
4) Uniformly mixing black powder and magnesium iron spinel powder according to a mass ratio of 10.
The dyeing sludge conditioning treatment in the following examples 4 to 7 was carried out using the sludge-dewatering agent prepared in example 1, and the dyeing sludge used in examples 4 to 7 was obtained from a sewage treatment plant in Wujin textile industry park, changzhou, jiangsu province, and the raw sludge moisture 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 sludge dry weight of 10%, and quickly stirring for 2min at the rotation speed of 240rpm, and then slowly stirring for 10min at the rotation speed of 60rpm. Then, the filtration dehydration was carried out under a pressure of 0.03MPa, and the results were as follows: after being conditioned by the printing and dyeing sludge dehydrating agent, compared with the original printing and dyeing sludge, the water content of the mud cake is reduced from 85.22 percent to 79.55 percent, and the specific resistance of the sludge is reduced from 4.50 multiplied by 10 11 m·kg -1 Down to 2.96X 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 40% of printing and dyeing sludge dehydrating agent by sludge dry weight, and quickly stirring for 2min at the rotation speed of 240rpm, and then slowly stirring for 10min at the rotation speed of 60rpm. Then, the filtration dehydration was carried out under a pressure of 0.03MPa, and the results were as follows: after being conditioned by the printing and dyeing sludge dehydrating agent, compared with the original printing and dyeing sludge, the water content of the sludge cake is reduced from 85.22 percent to 76.26 percentThe specific resistance of the sludge is 4.50 multiplied by 10 11 m·kg -1 Down to 2.23X 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 printing and dyeing sludge dehydrating agent by the dry weight of the sludge, quickly stirring for 2min at the rotating speed of 240rpm, and then slowly stirring for 10min at the rotating speed of 60rpm. Then, the filtration dehydration was carried out under a pressure of 0.03MPa, and the results were as follows: after being conditioned by the printing and dyeing sludge dehydrating agent, compared with the original printing and dyeing sludge, the water content of the mud cake is reduced from 85.22 percent to 75.13 percent, and the specific resistance of the sludge is reduced from 4.50 multiplied by 10 11 m·kg -1 Down to 1.89X 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 the printing and dyeing sludge dehydrating agent by the dry weight of the sludge, quickly stirring for 2min at the rotating speed of 240rpm, and then slowly stirring for 10min at the rotating speed of 60rpm. Then, the filtration dehydration was carried out under a pressure of 0.03MPa, and the results were as follows: after being conditioned by the printing and dyeing sludge dehydrating agent, compared with the original printing and dyeing sludge, the water content of a mud cake is reduced from 85.22 percent to 73.59 percent, and the specific resistance of the sludge is reduced from 4.50 multiplied by 10 11 m·kg -1 Down to 1.25X 10 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 (9)
1. The preparation method of the printing and dyeing sludge dehydrating agent is characterized by comprising the following steps;
(1) Calcining pine wood blocks under the protection of nitrogen, naturally cooling the calcined residual solid, washing with distilled water for multiple times until the pH of the filtrate is neutral, placing in a forced air drying oven, and drying at 80 ℃ to obtain pine wood charcoal;
(2) Mixing the mixed particles, the pine charcoal and a hydrochloric acid solution according to a solid-to-liquid ratio of 1:20, adding the mixture into a container, stirring for 2 hours, adjusting the temperature of the system to 70 ℃, adding acrylamide in the stirring process to obtain a mixture solution, drying and grinding the mixture to obtain black powder;
(3) Mixing the black powder obtained in the step (2) with the spinel powder according to a mass ratio of 10-20:1, and sieving to obtain the printing and dyeing sludge dehydrating agent.
2. The preparation method of the printing and dyeing sludge dehydrating agent according to claim 1, wherein the calcining temperature in the step (1) is 760 ℃ and the time is 2 hours.
3. The preparation method of the dyeing sludge dewatering agent according to claim 1, wherein the mixed particles in step (2) are prepared by 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 is added into 3mol/L ferric chloride solution and is subjected to ultrasonic mixing, and then filtering, residue collection, washing and drying are carried out to obtain mixed particles.
4. The preparation method of the dehydrating agent for printing and dyeing sludge according to claim 3, wherein the mass ratio of the ball-milled graphene oxide to the magnesium chloride to the aluminum oxide is 3-4.
5. The method for preparing the dyeing sludge dewatering agent according to claim 1, characterized in that the hydrochloric acid solution used in step (2) has a mass concentration of 15-37%.
6. The preparation method of the dyeing sludge dewatering agent according to claim 1, wherein the mass ratio of the mixed particles to the pine biochar in the step (2) is (6-10): (110-115), wherein the mass ratio of the acrylamide to the pine biochar is 0.5-0.7:1.
7. the preparation method of the dyeing sludge dewatering agent according to claim 1, wherein the spinel powder in step (3) is one of magnesium iron spinel powder and aluminum iron spinel powder.
8. The method for conditioning printing and dyeing sludge by using the printing and dyeing sludge dehydrating agent prepared by the preparation method of any one of claims 1 to 7, characterized in that the printing and dyeing sludge dehydrating agent is added into the printing and dyeing sludge in an amount of 10 to 70% by dry weight of the sludge, the mixture is rapidly stirred for 2min at a rotating speed of 220 to 240rpm and then slowly stirred for 10min at a rotating speed of 60 to 90rpm, and then filtered and dehydrated.
9. The method for conditioning printing and dyeing sludge according to claim 8, wherein the printing and dyeing sludge is aerobic sludge of a sewage treatment plant in a textile industry park, has a pH of 6 to 9, and has a water content of 85 to 98%.
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| 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 |
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