CN114249485A - Process for treating sludge in domestic sewage - Google Patents
Process for treating sludge in domestic sewage Download PDFInfo
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- CN114249485A CN114249485A CN202111624437.9A CN202111624437A CN114249485A CN 114249485 A CN114249485 A CN 114249485A CN 202111624437 A CN202111624437 A CN 202111624437A CN 114249485 A CN114249485 A CN 114249485A
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- magnetic particles
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- sludge
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- 239000010865 sewage Substances 0.000 title claims abstract description 91
- 239000010802 sludge Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 61
- 230000008569 process Effects 0.000 title claims abstract description 55
- 239000002131 composite material Substances 0.000 claims abstract description 100
- 239000006249 magnetic particle Substances 0.000 claims abstract description 88
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 47
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229920002873 Polyethylenimine Polymers 0.000 claims abstract description 35
- 229920001661 Chitosan Polymers 0.000 claims abstract description 33
- PFTAWBLQPZVEMU-DZGCQCFKSA-N (+)-catechin Chemical compound C1([C@H]2OC3=CC(O)=CC(O)=C3C[C@@H]2O)=CC=C(O)C(O)=C1 PFTAWBLQPZVEMU-DZGCQCFKSA-N 0.000 claims abstract description 32
- ADRVNXBAWSRFAJ-UHFFFAOYSA-N catechin Natural products OC1Cc2cc(O)cc(O)c2OC1c3ccc(O)c(O)c3 ADRVNXBAWSRFAJ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 235000005487 catechin Nutrition 0.000 claims abstract description 32
- 229950001002 cianidanol Drugs 0.000 claims abstract description 32
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 31
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000000498 ball milling Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 26
- 238000009210 therapy by ultrasound Methods 0.000 claims description 25
- 238000005189 flocculation Methods 0.000 claims description 22
- 230000016615 flocculation Effects 0.000 claims description 22
- 239000000701 coagulant Substances 0.000 claims description 21
- 230000015271 coagulation Effects 0.000 claims description 18
- 238000005345 coagulation Methods 0.000 claims description 18
- 239000008394 flocculating agent Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 18
- 238000010041 electrostatic spinning Methods 0.000 claims description 17
- 239000008367 deionised water Substances 0.000 claims description 15
- 229910021641 deionized water Inorganic materials 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 12
- 239000002121 nanofiber Substances 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 9
- 238000004064 recycling Methods 0.000 claims description 9
- 208000012886 Vertigo Diseases 0.000 claims description 8
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 8
- 238000009987 spinning Methods 0.000 claims description 8
- 238000004062 sedimentation Methods 0.000 claims description 6
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 4
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 4
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 21
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 239000004005 microsphere Substances 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 description 10
- 230000009471 action Effects 0.000 description 7
- 239000000126 substance Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 208000035473 Communicable disease Diseases 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 230000002458 infectious effect Effects 0.000 description 1
- 230000000968 intestinal effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0248—Compounds of B, Al, Ga, In, Tl
-
- 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
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
- B01J20/0288—Halides of compounds other than those provided for in B01J20/046
-
- 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
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
-
- 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
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
-
- 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
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/265—Synthetic macromolecular compounds modified or post-treated polymers
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28009—Magnetic properties
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28016—Particle form
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a process for treating sludge in domestic sewage, and particularly relates to the technical field of sewage treatment. According to the invention, after sewage and sludge treatment are performed for multiple times of circulating treatment, the high-cleanliness sewage treatment effect of the magnetic particles is still kept, so that the magnetic particles used in the sewage treatment process can be effectively recycled for a long time, the sewage treatment stability is good, catechin performs functional treatment on nano ferroferric oxide, chitosan and nano ferroferric oxide form composite nano microspheres, branched polyethyleneimine performs modification treatment on the nano ferroferric oxide, and polyaluminium chloride, nano zirconium dioxide and nano ferroferric oxide perform ball-milling coating treatment, so that the contact combination effect of raw materials in the composite magnetic particles can be effectively enhanced, and the stability is good; the catechin, the branched polyethyleneimine, the nano zirconium dioxide, the polyaluminium chloride and the chitosan three-dimensional network are compounded, so that the composite magnetic particles are better in stability and more stable in performance.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a process for treating sludge in domestic sewage.
Background
The domestic sewage is the waste water discharged by residents in daily life, and the pollutants contained in the domestic sewage are mainly organic matters (such as protein, carbohydrate, fat, urea, ammonia nitrogen and the like) and a large amount of pathogenic microorganisms (such as parasitic ova, intestinal infectious viruses and the like). Organic matters existing in domestic sewage are extremely unstable and easily decomposed to generate offensive odor. Bacteria and pathogens propagate in large quantities by taking organic matters in domestic sewage as nutrition, and can cause epidemic of infectious diseases. Therefore, domestic sewage must be treated before being discharged. In the conventional coagulation technology, chemical agents such as coagulant, flocculant and the like are added into sewage to enable colloid and suspended pollutants to be coalesced into large floccules, and then sludge is removed through precipitation. The magnetic reinforced coagulation technology forms high-density and compact-structure magnetic flocs with magnetic seeds as cores by adding recyclable magnetic substances, and has the advantages of low medicament consumption, short retention time and small occupied area.
The recycled product in the existing magnetic particle sewage and sludge treatment has seriously reduced performance when reused, and can seriously affect the subsequent sewage and sludge treatment effect.
Disclosure of Invention
In order to overcome the above defects of the prior art, the embodiment of the invention provides a process for treating sludge in domestic sewage.
A process for treating sludge in domestic sewage comprises the following specific treatment steps:
the method comprises the following steps: introducing sewage to be treated into a coagulation tank, adding a coagulant, stirring for 10-20 minutes, and then introducing the sewage into a magnetic mixing tank;
step two: adding the composite magnetic particles into a magnetic mixing tank, performing ultrasonic treatment for 20-30 minutes, and then introducing the sewage into a flocculation tank;
step three: adding a flocculating agent into a flocculation tank, stirring for 10-20 minutes, introducing the sewage into a sedimentation tank, standing until flocculation is completely settled to obtain sludge and water liquid, and discharging the water liquid;
step four: after the sludge is added into a high-speed shearing machine for strong stirring and dispersion, the composite magnetic particles are recovered through a magnetic drum separator and are thrown back into a magnetic mixing tank, so that the recycling of the composite magnetic particles is realized, and the residual sludge enters a sludge treatment system.
Further, in the step one, the stirring rotating speed is 130-140 RPM, and the addition amount of the coagulant in the coagulation tank is 130-150 mg/L; in the second step, the ultrasonic frequency is 1.6-1.8 MHz, the ultrasonic power is 300-400W, and the adding amount of the composite magnetic particles in the magnetic mixing pool is 500-700 mg/L; in the third step, the stirring speed is 60-80 RPM, and the addition amount of the flocculating agent in the flocculation tank is 13-15 mg/L;
further, in the step one, the stirring rotating speed is 130RPM, and the addition amount of the coagulant in the coagulation tank is 130 mg/L; in the second step, the ultrasonic frequency is 1.6MHz, the ultrasonic power is 300W, and the adding amount of the composite magnetic particles in the magnetic mixing pool is 500 mg/L; in the third step, the stirring speed is 60RPM, and the addition amount of the flocculating agent in the flocculation tank is 13 mg/L;
further, in the step one, the stirring rotating speed is 135RPM, and the addition amount of the coagulant in the coagulation tank is 140 mg/L; in the second step, the ultrasonic frequency is 1.7MHz, the ultrasonic power is 350W, and the adding amount of the composite magnetic particles in the magnetic mixing pool is 600 mg/L; in the third step, the stirring speed is 70RPM, and the addition amount of the flocculating agent in the flocculation tank is 14 mg/L;
the coagulant is one of aluminum sulfate, polymeric ferric sulfate, polymeric aluminum ferric chloride and ferric trichloride; the flocculating agent is polyacrylamide or polyethyleneimine; the composite magnetic particles comprise the following components in percentage by weight: 2.8-3.4% of catechin, 9.6-10.2% of chitosan, 2.6-3.2% of branched polyethyleneimine, 2.6-3.2% of nano zirconium dioxide, 4.5-5.3% of polyaluminium chloride and the balance of nano ferroferric oxide;
the preparation process of the composite magnetic particle comprises the following specific preparation steps:
s1: weighing catechin, chitosan, branched polyethyleneimine, nano zirconium dioxide, polyaluminium chloride and nano ferroferric oxide according to the weight percentage;
s2: adding the nano ferroferric oxide obtained in the step S1 into deionized water, and carrying out ultrasonic treatment for 10-15 minutes to obtain a mixture A;
s3: adding the catechin, the chitosan, the branched polyethyleneimine and the polyaluminium chloride obtained in the step S1 into the mixture A prepared in the step S2, and performing hydrothermal ultrasonic treatment for 20-30 minutes to obtain a mixture B;
s4: performing electrostatic spinning treatment on the mixture B prepared in the step S3 to obtain composite magnetic nano fibers;
s5: and (4) adding the composite magnetic nanofiber prepared in the step S4 and the nano zirconium dioxide prepared in the step S1 into a planetary ball mill for ball milling treatment, and sieving to obtain composite magnetic particles with the particle size of 5-10 microns.
Further, the composite magnetic particles comprise, by weight: 2.8% of catechin, 9.6% of chitosan, 2.6% of branched polyethyleneimine, 2.6% of nano zirconium dioxide, 4.5% of polyaluminium chloride and 77.9% of nano ferroferric oxide.
Further, the composite magnetic particles comprise, by weight: 3.4% of catechin, 10.2% of chitosan, 3.2% of branched polyethyleneimine, 3.2% of nano zirconium dioxide, 5.3% of polyaluminium chloride and 74.7% of nano ferroferric oxide.
Further, the composite magnetic particles comprise, by weight: 3.1% of catechin, 9.9% of chitosan, 2.9% of branched polyethyleneimine, 2.9% of nano zirconium dioxide, 4.9% of polyaluminium chloride and 76.3% of nano ferroferric oxide.
Further, in step S2, the weight ratio of the nano ferroferric oxide to the deionized water is: 1: 5-7, the ultrasonic frequency is 1.2-1.4 MHz, and the ultrasonic power is 400-500W; in step S3, the ultrasonic frequency is 21-23 KHz, the ultrasonic power is 900-1100W, and the hydrothermal temperature is 55-65 ℃; in step S4, the voltage of electrostatic spinning is 11-13 KV, the receiving distance is 12-14 cm, and the flow rate of the spinning solution is 1.1-1.5 ml/h; in step S5, the revolution speed of the planetary ball mill is 480-540 r/min; the rotation speed is 960-1080 r/min; the power is 28-30 KW.
Further, in step S2, the weight ratio of the nano ferroferric oxide to the deionized water is: 1: 6, the ultrasonic frequency is 1.3MHz, and the ultrasonic power is 450W; in step S3, the ultrasonic frequency is 22KHz, the ultrasonic power is 1000W, and the hydrothermal temperature is 60 ℃; in step S4, the voltage of electrostatic spinning is 12KV, the receiving distance is 13cm, and the flow rate of spinning solution is 1.3 ml/h; in step S5, the revolution speed of the planetary ball mill is 510 r/min; the rotation speed is 1020 r/min; the power is 29 KW.
The invention has the technical effects and advantages that:
1. the desulfurization ash prepared by the process for treating the sludge in the domestic sewage keeps the sewage treatment effect of high cleanliness after the sewage and sludge are treated for multiple times of circulating treatment, so that the magnetic particles used in the sewage treatment process can be effectively recycled for a long time, the sewage treatment stability is good, in the sewage treatment process, the sewage to be treated firstly reacts with a coagulant, then the sewage is collided with the composite magnetic particles in a magnetic mixing tank to form micro floccules taking magnetic seeds as cores, large and compact magnetic floccules are further formed under the adsorption and bridging action of a flocculating agent, finally the sewage is wrapped with the magnetic floccules and enters a sedimentation tank, the magnetic floccules and water are separated under the action of gravity, enter a magnetic seed recovery system, are scattered by a high shear machine, the residual sludge is discharged, the composite magnetic particles are recovered by a magnetic drum and then are configured into a solution with a certain concentration under the automatic control and are returned to a coagulation reaction tank, the recycling of the composite magnetic particles is realized; the catechin is used for carrying out functional treatment on the nano ferroferric oxide, so that the adsorption and removal treatment of the composite magnetic particles on heavy metals in the sewage can be effectively enhanced; the chitosan and the nano ferroferric oxide form composite nano microspheres, so that the adsorption and purification treatment effect on the sewage can be further enhanced; the branched polyethyleneimine is used for modifying the nano ferroferric oxide, so that the adsorption treatment performance of the composite magnetic particles on sewage can be further enhanced; the polyaluminium chloride wraps the nano ferroferric oxide, so that the adsorption treatment effect of the composite magnetic particles on sewage can be further enhanced; the nano zirconium dioxide and the nano ferroferric oxide are subjected to ball milling coating treatment, so that the contact combination effect of the raw materials in the composite magnetic particles can be effectively enhanced, and the stability is good; chitosan forms a three-dimensional network in the composite magnetic particles, and catechin, branched polyethyleneimine, nano zirconium dioxide, polyaluminium chloride and the chitosan three-dimensional network are compounded, so that the composite magnetic particles are better in stability and more stable in performance.
2. In the preparation and use processes of the composite magnetic particles, in the second step, 1.7MHz ultrasonic treatment is carried out after the composite magnetic particles are added, so that the distribution effect of the composite magnetic particles in sewage can be effectively enhanced, the utilization rate of the composite magnetic particles is higher, and the recycling effect is better; in step S2, the nano ferroferric oxide is uniformly dispersed into deionized water under 1.3MHz ultrasonic treatment, so that the subsequent treatment effect is facilitated; in step S3, the catechin, the chitosan, the branched polyethyleneimine, the polyaluminium chloride and the mixture A are subjected to ultrasonic treatment at 60 ℃ and 22KHz, so that the blending composite contact effect of the substances can be effectively enhanced; in step S4, the substances can be further compounded effectively by electrostatic spinning treatment, so that the performance of the composite magnetic particles is more stable, and the stability and safety of the subsequent composite magnetic particles in the recycling process are ensured; in step S5, the composite magnetic nanofibers and the nano zirconia are ball-milled, so that the nano zirconia coats and modifies the composite nanofibers.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a process for treating sludge in domestic sewage, which comprises the following specific treatment steps:
the method comprises the following steps: introducing sewage to be treated into a coagulation tank, adding a coagulant, stirring for 10 minutes, and then introducing the sewage into a magnetic mixing tank;
step two: adding the composite magnetic particles into a magnetic mixing tank, performing ultrasonic treatment for 20 minutes, and then introducing the sewage into a flocculation tank;
step three: adding a flocculating agent into a flocculation tank, stirring for 10 minutes, then introducing the sewage into a sedimentation tank, standing until flocculation is completely settled to obtain sludge and water liquid, and discharging the water liquid;
step four: adding the sludge into a high-speed shearing machine for strong stirring and dispersion, recovering composite magnetic particles through a magnetic drum separator, returning the composite magnetic particles into a magnetic mixing tank, realizing recycling of the composite magnetic particles, and allowing the residual sludge to enter a sludge treatment system;
in the first step, the stirring speed is 130RPM, and the addition amount of the coagulant in a coagulation tank is 130 mg/L; in the second step, the ultrasonic frequency is 1.6MHz, the ultrasonic power is 300W, and the adding amount of the composite magnetic particles in the magnetic mixing pool is 500 mg/L; in the third step, the stirring speed is 60RPM, and the addition amount of the flocculating agent in the flocculation tank is 13 mg/L;
the coagulant is one of aluminum sulfate, polymeric ferric sulfate, polymeric aluminum ferric chloride and ferric trichloride; the flocculating agent is polyacrylamide or polyethyleneimine; the composite magnetic particles comprise the following components in percentage by weight: 2.8% of catechin, 9.6% of chitosan, 2.6% of branched polyethyleneimine, 2.6% of nano zirconium dioxide, 4.5% of polyaluminium chloride and 77.9% of nano ferroferric oxide;
the preparation process of the composite magnetic particle comprises the following specific preparation steps:
s1: weighing catechin, chitosan, branched polyethyleneimine, nano zirconium dioxide, polyaluminium chloride and nano ferroferric oxide according to the weight percentage;
s2: adding the nano ferroferric oxide obtained in the step S1 into deionized water, and carrying out ultrasonic treatment for 10-15 minutes to obtain a mixture A;
s3: adding the catechin, the chitosan, the branched polyethyleneimine and the polyaluminium chloride obtained in the step S1 into the mixture A prepared in the step S2, and performing hydrothermal ultrasonic treatment for 20-30 minutes to obtain a mixture B;
s4: performing electrostatic spinning treatment on the mixture B prepared in the step S3 to obtain composite magnetic nano fibers;
s5: and (4) adding the composite magnetic nanofiber prepared in the step S4 and the nano zirconium dioxide prepared in the step S1 into a planetary ball mill for ball milling treatment, and sieving to obtain composite magnetic particles with the particle size of 5-10 microns.
In step S2, the weight ratio of nano ferroferric oxide to deionized water is: 1: 5, the ultrasonic frequency is 1.2MHz, and the ultrasonic power is 400W; in step S3, the ultrasonic frequency is 21KHz, the ultrasonic power is 900W, and the hydrothermal temperature is 55 ℃; in step S4, the voltage of electrostatic spinning is 11KV, the receiving distance is 12cm, and the flow rate of the spinning solution is 1.1 ml/h; in step S5, the revolution speed of the planetary ball mill is 480 r/min; the rotation speed is 960 r/min; the power is 28 KW.
Example 2:
unlike example 1, the composite magnetic particle includes, in weight percent: 3.4% of catechin, 10.2% of chitosan, 3.2% of branched polyethyleneimine, 3.2% of nano zirconium dioxide, 5.3% of polyaluminium chloride and 74.7% of nano ferroferric oxide.
Example 3:
unlike examples 1-2, the composite magnetic particles comprise, in weight percent: 3.1% of catechin, 9.9% of chitosan, 2.9% of branched polyethyleneimine, 2.9% of nano zirconium dioxide, 4.9% of polyaluminium chloride and 76.3% of nano ferroferric oxide.
Taking the process for treating sludge in the domestic sewage in the embodiment 1-3 and the process for treating sludge in the domestic sewage in the first control group, the process for treating sludge in the domestic sewage in the second control group, the process for treating sludge in the domestic sewage in the third control group, the process for treating sludge in the domestic sewage in the fourth control group and the process for treating sludge in the domestic sewage in the fifth control group respectively, the process for treating sludge in the domestic sewage in the first control group and the process for treating sludge in the fifth control group have no catechin in the composite magnetic particles in three-phase ratio; the process for treating the sludge in the domestic sewage of the second control group does not contain chitosan in the composite magnetic particles in the three-phase ratio compared with the embodiment; compared with the three-phase ratio composite magnetic particles of the embodiment, the process for treating the sludge in the domestic sewage of the third control group does not contain branched polyethyleneimine; the process for treating the sludge in the domestic sewage of the control group IV does not contain the nano zirconium dioxide in the composite magnetic particles in the three-phase ratio with the embodiment; compared with the three-phase ratio composite magnetic particles of the embodiment, the process for treating the sludge in the domestic sewage of the fifth control group does not contain polyaluminium chloride; the water liquids processed in the three examples and the water liquids processed by the treatment process of the sludge in the domestic sewage of the five control groups are respectively tested by eight groups, and the test results are shown in the table one:
table one:
as can be seen from table one, when the composite magnetic particles comprise, in weight percent: 3.1% of catechin, 9.9% of chitosan, 2.9% of branched polyethyleneimine, 2.9% of nano zirconium dioxide, 4.9% of polyaluminum chloride and 76.3% of nano ferroferric oxide, the magnetic particles still keep a high-cleanliness sewage treatment effect after sewage and sludge treatment for multiple cycles, so that the magnetic particles used in the sewage treatment process can be effectively recycled for a long time, and the sewage treatment stability is good, so that embodiment 3 is a preferred embodiment of the invention; in the sewage treatment process, sewage to be treated firstly reacts with a coagulant, then collides with composite magnetic particles in a magnetic mixing tank to form tiny flocs taking magnetic seeds as cores, further forms large and compact magnetic flocs under the adsorption and bridging action of a flocculating agent, finally enters a sedimentation tank with the magnetic flocs wrapped by the sewage, the magnetic flocs and water are separated under the action of gravity, enters a magnetic seed recovery system, is scattered by a high shear cutter, residual sludge is discharged, the composite magnetic particles are recovered by a magnetic drum and then are prepared into a solution with a certain concentration under automatic control to be fed back to the coagulation reaction tank, and the cyclic utilization of the composite magnetic particles is realized; catechin in the composite magnetic particles is compounded with the nano ferroferric oxide under the heating ultrasonic treatment in deionized water, and the catechin is used for carrying out functional treatment on the nano ferroferric oxide, so that the adsorption and removal treatment of the composite magnetic particles on heavy metals in sewage can be effectively enhanced; the chitosan and the nano ferroferric oxide are subjected to composite treatment under ultrasonic treatment and electrostatic spinning treatment to form composite nano microspheres, so that the adsorption and purification treatment effect on sewage can be further enhanced; the branched polyethyleneimine is used for modifying the nano ferroferric oxide under hydrothermal ultrasonic treatment and electrostatic spinning treatment, so that the adsorption treatment performance of the composite magnetic particles on sewage can be further enhanced; the polyaluminium chloride wraps the nano ferroferric oxide under hydrothermal and ultrasonic treatment and electrostatic spinning treatment, so that the adsorption treatment effect of the composite magnetic particles on sewage can be further enhanced; the nano zirconium dioxide and the nano ferroferric oxide are subjected to ball milling coating treatment, so that the contact combination effect of the raw materials in the composite magnetic particles can be effectively enhanced, and the stability is good; the chitosan forms a three-dimensional network in the composite magnetic particles, and the catechin, the branched polyethyleneimine, the nano zirconium dioxide, the polyaluminium chloride and the chitosan three-dimensional network are compounded, so that the contact and combination effect of the catechin, the branched polyethyleneimine, the nano zirconium dioxide, the polyaluminium chloride, the chitosan and the nano ferroferric oxide can be effectively enhanced, and the composite magnetic particles are better in stability and more stable in performance.
Example 4:
the invention provides a process for treating sludge in domestic sewage, which comprises the following specific treatment steps:
the method comprises the following steps: introducing sewage to be treated into a coagulation tank, adding a coagulant, stirring for 15 minutes, and then introducing the sewage into a magnetic mixing tank;
step two: adding the composite magnetic particles into a magnetic mixing tank, performing ultrasonic treatment for 25 minutes, and then introducing the sewage into a flocculation tank;
step three: adding a flocculating agent into a flocculation tank, stirring for 15 minutes, then introducing the sewage into a sedimentation tank, standing until flocculation is completely settled to obtain sludge and water liquid, and discharging the water liquid;
step four: adding the sludge into a high-speed shearing machine for strong stirring and dispersion, recovering composite magnetic particles through a magnetic drum separator, returning the composite magnetic particles into a magnetic mixing tank, realizing recycling of the composite magnetic particles, and allowing the residual sludge to enter a sludge treatment system;
in the first step, the stirring speed is 130RPM, and the addition amount of the coagulant in a coagulation tank is 130 mg/L; in the second step, the ultrasonic frequency is 1.6MHz, the ultrasonic power is 300W, and the adding amount of the composite magnetic particles in the magnetic mixing pool is 500 mg/L; in the third step, the stirring speed is 60RPM, and the addition amount of the flocculating agent in the flocculation tank is 13 mg/L;
the coagulant is one of aluminum sulfate, polymeric ferric sulfate, polymeric aluminum ferric chloride and ferric trichloride; the flocculating agent is polyacrylamide or polyethyleneimine; the composite magnetic particles comprise the following components in percentage by weight: 2.8% of catechin, 9.6% of chitosan, 2.6% of branched polyethyleneimine, 2.6% of nano zirconium dioxide, 4.5% of polyaluminium chloride and 77.9% of nano ferroferric oxide;
the preparation process of the composite magnetic particle comprises the following specific preparation steps:
s1: weighing catechin, chitosan, branched polyethyleneimine, nano zirconium dioxide, polyaluminium chloride and nano ferroferric oxide according to the weight percentage;
s2: adding the nano ferroferric oxide obtained in the step S1 into deionized water, and carrying out ultrasonic treatment for 10-15 minutes to obtain a mixture A;
s3: adding the catechin, the chitosan, the branched polyethyleneimine and the polyaluminium chloride obtained in the step S1 into the mixture A prepared in the step S2, and performing hydrothermal ultrasonic treatment for 20-30 minutes to obtain a mixture B;
s4: performing electrostatic spinning treatment on the mixture B prepared in the step S3 to obtain composite magnetic nano fibers;
s5: and (4) adding the composite magnetic nanofiber prepared in the step S4 and the nano zirconium dioxide prepared in the step S1 into a planetary ball mill for ball milling treatment, and sieving to obtain composite magnetic particles with the particle size of 5-10 microns.
In step S2, the weight ratio of nano ferroferric oxide to deionized water is: 1: 5, the ultrasonic frequency is 1.2MHz, and the ultrasonic power is 400W; in step S3, the ultrasonic frequency is 21KHz, the ultrasonic power is 900W, and the hydrothermal temperature is 55 ℃; in step S4, the voltage of electrostatic spinning is 11KV, the receiving distance is 12cm, and the flow rate of the spinning solution is 1.1 ml/h; in step S5, the revolution speed of the planetary ball mill is 480 r/min; the rotation speed is 960 r/min; the power is 28 KW.
Example 5:
different from the embodiment 4, in the step one, the stirring rotating speed is 140RPM, and the addition amount of the coagulant in the coagulation tank is 150 mg/L; in the second step, the ultrasonic frequency is 1.8MHz, the ultrasonic power is 400W, and the adding amount of the composite magnetic particles in the magnetic mixing pool is 700 mg/L; in the third step, the stirring speed is 80RPM, and the addition amount of the flocculating agent in the flocculation tank is 15 mg/L; in step S2, the weight ratio of nano ferroferric oxide to deionized water is: 1: 7, the ultrasonic frequency is 1.4MHz, and the ultrasonic power is 500W; in step S3, the ultrasonic frequency is 23KHz, the ultrasonic power is 1100W, and the hydrothermal temperature is 65 ℃; in step S4, the voltage of electrostatic spinning is 13KV, the receiving distance is 14cm, and the flow rate of spinning solution is 1.5 ml/h; in step S5, the revolution speed of the planetary ball mill is 540 r/min; the autorotation speed is 1080 r/min; the power is 30 KW.
Example 6:
different from the embodiment 45, in the step one, the stirring rotating speed is 135RPM, and the addition amount of the coagulant in the coagulation tank is 140 mg/L; in the second step, the ultrasonic frequency is 1.7MHz, the ultrasonic power is 350W, and the adding amount of the composite magnetic particles in the magnetic mixing pool is 600 mg/L; in the third step, the stirring speed is 70RPM, and the addition amount of the flocculating agent in the flocculation tank is 14 mg/L; in step S2, the weight ratio of nano ferroferric oxide to deionized water is: 1: 6, the ultrasonic frequency is 1.3MHz, and the ultrasonic power is 450W; in step S3, the ultrasonic frequency is 22KHz, the ultrasonic power is 1000W, and the hydrothermal temperature is 60 ℃; in step S4, the voltage of electrostatic spinning is 12KV, the receiving distance is 13cm, and the flow rate of spinning solution is 1.3 ml/h; in step S5, the revolution speed of the planetary ball mill is 510 r/min; the rotation speed is 1020 r/min; the power is 29 KW.
Taking the process for treating sludge in domestic sewage of the control group six, the process for treating sludge in domestic sewage of the control group seven, the process for treating sludge in domestic sewage of the control group eight and the process for treating sludge in domestic sewage of the control group nine, respectively, which were prepared in examples 4 to 6, the process for treating sludge in domestic sewage of the control group six was not subjected to ultrasonic treatment in step two as compared with example six, the process for treating sludge in domestic sewage of the control group seven was not subjected to ultrasonic treatment in step S2 as compared with example six, the process for treating sludge in domestic sewage of the control group eight was not subjected to ultrasonic treatment in step S3 as compared with example six, and the process for treating sludge in domestic sewage of the control group nine was not subjected to operation in step S4 as compared with example six, the water liquids processed in the three examples and the water liquids processed by the treatment process of the sludge in the domestic sewage of the three control groups are respectively tested in seven groups, and the test results are shown in the table two:
table two:
as can be seen from table two, example 6 is a preferred embodiment of the present invention; in the second step, 1.7MHz ultrasonic treatment is carried out after the composite magnetic particles are added, so that the distribution effect of the composite magnetic particles in sewage can be effectively enhanced, the utilization rate of the composite magnetic particles is higher, and the recycling effect is better; in step S2, the nano ferroferric oxide is uniformly dispersed into deionized water under 1.3MHz ultrasonic treatment, so that the subsequent treatment effect is facilitated; in step S3, the catechin, the chitosan, the branched polyethyleneimine, the polyaluminium chloride and the mixture A are subjected to ultrasonic treatment at 60 ℃ and 22KHz, so that the blending composite contact effect of the substances can be effectively enhanced; in step S4, the substances can be further compounded effectively by electrostatic spinning treatment, so that the performance of the composite magnetic particles is more stable, and the stability and safety of the subsequent composite magnetic particles in the recycling process are ensured; in step S5, the composite magnetic nanofibers and the nano zirconia are ball-milled, so that the nano zirconia coats and modifies the composite nanofibers.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A process for treating sludge in domestic sewage is characterized in that: the specific treatment steps are as follows:
the method comprises the following steps: introducing sewage to be treated into a coagulation tank, adding a coagulant, stirring for 10-20 minutes, and then introducing the sewage into a magnetic mixing tank;
step two: adding the composite magnetic particles into a magnetic mixing tank, performing ultrasonic treatment for 20-30 minutes, and then introducing the sewage into a flocculation tank;
step three: adding a flocculating agent into a flocculation tank, stirring for 10-20 minutes, introducing the sewage into a sedimentation tank, standing until flocculation is completely settled to obtain sludge and water liquid, and discharging the water liquid;
step four: after the sludge is added into a high-speed shearing machine for strong stirring and dispersion, the composite magnetic particles are recovered through a magnetic drum separator and are thrown back into a magnetic mixing tank, so that the recycling of the composite magnetic particles is realized, and the residual sludge enters a sludge treatment system.
2. The process for treating sludge in domestic sewage according to claim 1, wherein in the step one, the stirring speed is 130-140 RPM, and the addition amount of the coagulant in the coagulation tank is 130-150 mg/L; in the second step, the ultrasonic frequency is 1.6-1.8 MHz, the ultrasonic power is 300-400W, and the adding amount of the composite magnetic particles in the magnetic mixing pool is 500-700 mg/L; in the third step, the stirring speed is 60-80 RPM, and the addition amount of the flocculating agent in the flocculation tank is 13-15 mg/L.
3. The process for treating sludge in domestic sewage according to claim 2, wherein: in the first step, the stirring speed is 130RPM, and the addition amount of the coagulant in a coagulation tank is 130 mg/L; in the second step, the ultrasonic frequency is 1.6MHz, the ultrasonic power is 300W, and the adding amount of the composite magnetic particles in the magnetic mixing pool is 500 mg/L; in the third step, the stirring speed is 60RPM, and the addition amount of the flocculant in the flocculation tank is 13 mg/L.
4. The process for treating sludge in domestic sewage according to claim 2, wherein: in the first step, the stirring speed is 135RPM, and the addition amount of the coagulant in a coagulation tank is 140 mg/L; in the second step, the ultrasonic frequency is 1.7MHz, the ultrasonic power is 350W, and the adding amount of the composite magnetic particles in the magnetic mixing pool is 600 mg/L; in the third step, the stirring speed is 70RPM, and the addition amount of the flocculant in the flocculation tank is 14 mg/L.
5. The process of claim 1, wherein the treatment of sludge in domestic sewage comprises: the coagulant is one of aluminum sulfate, polymeric ferric sulfate, polymeric aluminum ferric chloride and ferric trichloride; the flocculating agent is polyacrylamide or polyethyleneimine; the composite magnetic particles comprise the following components in percentage by weight: 2.8-3.4% of catechin, 9.6-10.2% of chitosan, 2.6-3.2% of branched polyethyleneimine, 2.6-3.2% of nano zirconium dioxide, 4.5-5.3% of polyaluminium chloride and the balance of nano ferroferric oxide;
the preparation process of the composite magnetic particle comprises the following specific preparation steps:
s1: weighing catechin, chitosan, branched polyethyleneimine, nano zirconium dioxide, polyaluminium chloride and nano ferroferric oxide according to the weight percentage;
s2: adding the nano ferroferric oxide obtained in the step S1 into deionized water, and carrying out ultrasonic treatment for 10-15 minutes to obtain a mixture A;
s3: adding the catechin, the chitosan, the branched polyethyleneimine and the polyaluminium chloride obtained in the step S1 into the mixture A prepared in the step S2, and performing hydrothermal ultrasonic treatment for 20-30 minutes to obtain a mixture B;
s4: performing electrostatic spinning treatment on the mixture B prepared in the step S3 to obtain composite magnetic nano fibers;
s5: and (4) adding the composite magnetic nanofiber prepared in the step S4 and the nano zirconium dioxide prepared in the step S1 into a planetary ball mill for ball milling treatment, and sieving to obtain composite magnetic particles with the particle size of 5-10 microns.
6. The process of claim 5, wherein the sludge treatment process comprises: the composite magnetic particles comprise the following components in percentage by weight: 2.8% of catechin, 9.6% of chitosan, 2.6% of branched polyethyleneimine, 2.6% of nano zirconium dioxide, 4.5% of polyaluminium chloride and 77.9% of nano ferroferric oxide.
7. The process of claim 5, wherein the sludge treatment process comprises: the composite magnetic particles comprise the following components in percentage by weight: 3.4% of catechin, 10.2% of chitosan, 3.2% of branched polyethyleneimine, 3.2% of nano zirconium dioxide, 5.3% of polyaluminium chloride and 74.7% of nano ferroferric oxide.
8. The process of claim 5, wherein the sludge treatment process comprises: the composite magnetic particles comprise the following components in percentage by weight: 3.1% of catechin, 9.9% of chitosan, 2.9% of branched polyethyleneimine, 2.9% of nano zirconium dioxide, 4.9% of polyaluminium chloride and 76.3% of nano ferroferric oxide.
9. The process of claim 5, wherein the sludge treatment process comprises: in step S2, the weight ratio of nano ferroferric oxide to deionized water is: 1: 5-7, the ultrasonic frequency is 1.2-1.4 MHz, and the ultrasonic power is 400-500W; in step S3, the ultrasonic frequency is 21-23 KHz, the ultrasonic power is 900-1100W, and the hydrothermal temperature is 55-65 ℃; in step S4, the voltage of electrostatic spinning is 11-13 KV, the receiving distance is 12-14 cm, and the flow rate of the spinning solution is 1.1-1.5 ml/h; in step S5, the revolution speed of the planetary ball mill is 480-540 r/min; the rotation speed is 960-1080 r/min; the power is 28-30 KW.
10. The process of claim 9, wherein the treatment of sludge in domestic sewage comprises: in step S2, the weight ratio of nano ferroferric oxide to deionized water is: 1: 6, the ultrasonic frequency is 1.3MHz, and the ultrasonic power is 450W; in step S3, the ultrasonic frequency is 22KHz, the ultrasonic power is 1000W, and the hydrothermal temperature is 60 ℃; in step S4, the voltage of electrostatic spinning is 12KV, the receiving distance is 13cm, and the flow rate of spinning solution is 1.3 ml/h; in step S5, the revolution speed of the planetary ball mill is 510 r/min; the rotation speed is 1020 r/min; the power is 29 KW.
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| CN108623074A (en) * | 2018-05-16 | 2018-10-09 | 武汉霖泉环保科技有限公司 | A kind of preparation method of multi-functional compound magnetic kind and its application during water process magnetic flocculation |
| CN110540986A (en) * | 2019-09-09 | 2019-12-06 | 华东理工大学 | Polyamine-assisted natural polyphenol rapid and stable modification magnetic nano immobilized enzyme carrier and application thereof |
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| CN112079517A (en) * | 2020-09-10 | 2020-12-15 | 扬州碧蓝水环境治理有限公司 | Initial rainwater treatment process based on super-magnetic coagulation sedimentation technology |
| CN112939303A (en) * | 2021-03-23 | 2021-06-11 | 陕西新泓水艺环境科技有限公司 | Sewage treatment device and sewage treatment system |
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