CN116903154A - Small-particle-size mud film particles and sewage treatment method thereof - Google Patents
Small-particle-size mud film particles and sewage treatment method thereof Download PDFInfo
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- CN116903154A CN116903154A CN202311105573.6A CN202311105573A CN116903154A CN 116903154 A CN116903154 A CN 116903154A CN 202311105573 A CN202311105573 A CN 202311105573A CN 116903154 A CN116903154 A CN 116903154A
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- 239000002245 particle Substances 0.000 title claims abstract description 169
- 239000010865 sewage Substances 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 48
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 187
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 93
- 239000010802 sludge Substances 0.000 claims abstract description 91
- 230000002195 synergetic effect Effects 0.000 claims abstract description 56
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 55
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 55
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
- 239000012528 membrane Substances 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 230000001580 bacterial effect Effects 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 239000002131 composite material Substances 0.000 claims description 25
- 241000894006 Bacteria Species 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 229910052698 phosphorus Inorganic materials 0.000 claims description 22
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 21
- 239000011574 phosphorus Substances 0.000 claims description 21
- 239000003124 biologic agent Substances 0.000 claims description 16
- 239000008367 deionised water Substances 0.000 claims description 16
- 229910021641 deionized water Inorganic materials 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 14
- 238000004062 sedimentation Methods 0.000 claims description 12
- 229920001661 Chitosan Polymers 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 8
- QMDUPVPMPVZZGK-UHFFFAOYSA-N n,n-dimethyloctadecan-1-amine;hydrobromide Chemical compound [Br-].CCCCCCCCCCCCCCCCCC[NH+](C)C QMDUPVPMPVZZGK-UHFFFAOYSA-N 0.000 claims description 8
- 235000016709 nutrition Nutrition 0.000 claims description 8
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 8
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 8
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 8
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 claims description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 7
- 230000032683 aging Effects 0.000 claims description 7
- 239000007822 coupling agent Substances 0.000 claims description 7
- 238000002425 crystallisation Methods 0.000 claims description 7
- 230000008025 crystallization Effects 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 230000012447 hatching Effects 0.000 claims description 7
- 239000002068 microbial inoculum Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 6
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 230000004048 modification Effects 0.000 claims description 5
- 238000012986 modification Methods 0.000 claims description 5
- 239000011780 sodium chloride Substances 0.000 claims description 4
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 3
- 239000001888 Peptone Substances 0.000 claims description 3
- 108010080698 Peptones Proteins 0.000 claims description 3
- 229940041514 candida albicans extract Drugs 0.000 claims description 3
- 239000008103 glucose Substances 0.000 claims description 3
- 235000019319 peptone Nutrition 0.000 claims description 3
- 229910000160 potassium phosphate Inorganic materials 0.000 claims description 3
- 235000011009 potassium phosphates Nutrition 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 239000001509 sodium citrate Substances 0.000 claims description 3
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 3
- 239000012138 yeast extract Substances 0.000 claims description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 2
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 238000005238 degreasing Methods 0.000 claims 1
- 230000003009 desulfurizing effect Effects 0.000 claims 1
- 244000005700 microbiome Species 0.000 abstract description 29
- 239000011148 porous material Substances 0.000 abstract description 7
- 238000012546 transfer Methods 0.000 abstract description 6
- 238000005202 decontamination Methods 0.000 abstract 1
- 230000003588 decontaminative effect Effects 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 19
- 229910052757 nitrogen Inorganic materials 0.000 description 15
- 238000012360 testing method Methods 0.000 description 13
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 239000002351 wastewater Substances 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 230000003247 decreasing effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 230000012010 growth Effects 0.000 description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- 235000015097 nutrients Nutrition 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 2
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 241000233866 Fungi Species 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 241001148470 aerobic bacillus Species 0.000 description 2
- -1 alkyl sodium chloride Chemical compound 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000004060 metabolic process Effects 0.000 description 2
- 230000001546 nitrifying effect Effects 0.000 description 2
- 230000035764 nutrition Effects 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 230000035755 proliferation Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000002798 spectrophotometry method Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 description 1
- DEXFNLNNUZKHNO-UHFFFAOYSA-N 6-[3-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperidin-1-yl]-3-oxopropyl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1CCN(CC1)C(CCC1=CC2=C(NC(O2)=O)C=C1)=O DEXFNLNNUZKHNO-UHFFFAOYSA-N 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 description 1
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 241000589651 Zoogloea Species 0.000 description 1
- FHKPLLOSJHHKNU-INIZCTEOSA-N [(3S)-3-[8-(1-ethyl-5-methylpyrazol-4-yl)-9-methylpurin-6-yl]oxypyrrolidin-1-yl]-(oxan-4-yl)methanone Chemical compound C(C)N1N=CC(=C1C)C=1N(C2=NC=NC(=C2N=1)O[C@@H]1CN(CC1)C(=O)C1CCOCC1)C FHKPLLOSJHHKNU-INIZCTEOSA-N 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000009614 chemical analysis method Methods 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 230000006196 deacetylation Effects 0.000 description 1
- 238000003381 deacetylation reaction Methods 0.000 description 1
- 230000034994 death Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 238000003921 particle size analysis Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 235000003784 poor nutrition Nutrition 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000004819 silanols Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 235000018648 unbalanced nutrition Nutrition 0.000 description 1
- 239000002699 waste material 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/348—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the way or the form in which the microorganisms are added or dosed
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The application discloses small-particle-size sludge membrane particles and a sewage treatment method thereof, wherein the small-particle-size sludge membrane particles comprise the following components in percentage by mass: (0.2-0.4) biological synergistic carrier and active biological bacterial agent; the raw materials of the biological synergistic carrier comprise the following components in percentage by mass: (0.5-0.7) mesoporous silica and polyvinyl alcohol. The small particle size of the mesoporous silica stabilizes the formed mud film particles in a smaller particle size range, the excellent pore channel structure of the mesoporous silica provides a good living environment for microorganisms, an internal anaerobic, middle facultative and external aerobic space layered structure is formed, the mass transfer performance, the decontamination capability and the stability are improved to some extent, the polyvinyl alcohol is connected to the surface of the mesoporous silica, and the hydrophilicity of the mesoporous silica is favorable for increasing the microorganism fixation capability of the biological synergistic carrier.
Description
Technical Field
The application relates to the field of sewage treatment, in particular to a small-particle-size mud membrane particle and a sewage treatment method thereof.
Background
The activated sludge technology is artificial strengthening of natural water self-cleaning effect, and can remove dissolved and colloidal biodegradable organic matters and other substances in sewage. And the aerobic sludge particles are biological aggregates formed by self-flocculating microorganisms under the action of selective pressure, and have the advantages of high sludge concentration, stronger toxicity resistance, impact load resistance and synchronous denitrification and dephosphorization compared with the traditional activated sludge technology.
However, in the process of culturing the aerobic sludge particles, due to different diffusion efficiencies of substrates, nutrients and the like in the granular sludge, the filamentous bacteria supporting the aerobic sludge particles excessively grow or form zoogloea connected by the filamentous bacteria under the impact of water flow, so that a large amount of nitrifying bacteria contained in the aerobic sludge particles are lost, the nitrifying bacteria slowly grow in a recovery manner, and the stability of the aerobic sludge particles is further reduced. Meanwhile, the aerobic sludge particles have larger particle size, and the average particle size is 1-3 mm, so that the mass transfer effect of dissolved oxygen and target removed substances is poor, and the microbial activity in the particles is low, so that the stability of the aerobic sludge particles is also reduced.
Disclosure of Invention
The application provides small-particle-size sludge membrane particles and a sewage treatment method thereof, and aims to solve the problems of poor stability of aerobic sludge particles, poor mass transfer effect of substances caused by large particle sizes and the like.
In a first aspect, the application provides a small-particle-size sludge membrane particle comprising flocculent sludge, a biological synergistic carrier and an active biological agent; the raw materials of the biological synergistic carrier comprise the following components in percentage by mass: (0.5-0.7) mesoporous silica and polyvinyl alcohol.
Preferably, the small-particle-size mud film particles have a particle size of 100-300 μm.
Preferably, the mesoporous silica has a particle size of 20 to 50nm.
Preferably, the polyvinyl alcohol is a completely alcoholysis-type polyvinyl alcohol having an average polymerization degree of 1500 to 2000.
By adopting the technical scheme, the active biological agent is fixed on the biological synergistic carrier through a hanging film. The raw materials of the bio-synergistic carrier comprise mesoporous silica and polyvinyl alcohol, wherein the mesoporous silica and the polyvinyl alcohol have better biocompatibility and have no toxic or harmful effect on microorganisms.
The mesoporous silica has rich pore canal structures which are mutually communicated or closed, and microorganisms are fixed on the mesoporous silica, so that the flora contained in the active biological strains can be effectively immobilized, the good impact resistance is kept, the influence on the microorganisms caused by the change of the sludge load and the volume load in the water inlet process is resisted, and the structural stability of the small-particle-size sludge film particles is enhanced. The high porosity of the mesoporous silica can also accommodate continuously proliferated microorganisms, so that the cell concentration in the bio-synergistic carrier is increased, the sewage treatment efficiency is improved, and meanwhile, the transmission of substances such as dissolved oxygen, target removed substances and the like can be carried out through the pores in the mesoporous silica, thereby being beneficial to the growth of aerobic bacteria on the carrier and the discharge of substances such as nitrogen generated in the denitrification process, and the high skeleton rigidity of the mesoporous silica is also beneficial to the maintenance of the stability of the particle mud film.
However, since the mesoporous silica has a smoother surface and does not contain a large amount of positive charges, when the mesoporous silica is used as a carrier, the capability of attracting the aggregation of microorganisms is weak, the capability of attaching the microorganisms is poor, and the active biological agent is difficult to grow and reproduce on the mesoporous silica by taking the mesoporous silica as the carrier in the mud membrane particle culture process. The polyvinyl alcohol has excellent hydrophilicity and contains enough positive charges, so that a good microenvironment can be provided for the metabolism proliferation of fixed microorganisms, and the defect that mesoporous silicon dioxide is difficult to attract microorganisms to gather and reproduce is overcome; meanwhile, the polyvinyl alcohol at the surface connection part of the mesoporous silica can also increase the water insolubility of the polyvinyl alcohol and the fixation of the biological synergistic carrier to microorganisms, thereby being beneficial to increasing the stability of the small-particle-size mud film particles.
The mesoporous silica also has a small particle size of 20-50 nm, and can be used as a carrier to ensure that the average particle size of formed mud film particles is kept in a smaller range in the subsequent culture process of the mud film particles with small particle size, so that the formed mud film particles with small particle size have larger specific surface area and better mass transfer efficiency.
The naturally formed aerobic sludge particles have large particle size, can form an internal anaerobic, middle facultative and external aerobic space layered structure, and under the condition of small particle size, the biomass of the aerobic sludge particles is small, a large number of aerobic bacteria die, the particle stability is poor, and the space structure is difficult to maintain; the mesoporous silica has good pore structure and high porosity, so that the microorganism growth and propagation space is large, the added active biological microbial agent is not influenced to form an internal anaerobic, middle facultative and external aerobic space layered structure on the biological synergistic carrier, COD and nitrogen and phosphorus removal are realized, and meanwhile, the high specific surface area and the high mass transfer efficiency of small particle size are also realized.
Preferably, the mesoporous silica comprises the following raw materials in percentage by mass (0.1-0.3): 1 a composite template agent and tetraethoxysilane; the composite template agent comprises one or a combination of more of octadecyl dimethyl ammonium bromide, polyvinylpyrrolidone and sodium dodecyl sulfate.
Preferably, the preparation process of the mesoporous silica comprises the following steps: adding the composite template agent into deionized water, stirring to dissolve the composite template agent completely, then adding tetraethoxysilane, and stirring and reacting for 20-24 h under the water bath condition of 35-45 ℃; after the reaction is finished, the mixture is transferred into a hydrothermal kettle for ageing crystallization for 24 to 26 hours, the ageing crystallization product is dried, ground and put into a muffle furnace, calcined for 5 to 7 hours at the temperature of 500 to 600 ℃, and then ground to obtain the mesoporous silica.
Preferably, the aging crystallization temperature is 90 to 120 ℃.
By adopting the technical scheme, the micelle formed by the composite template agent in water can induce the morphology of mesoporous silica to form, the composite template agent and hydrolyzed tetraethoxysilane are assembled into a mesoporous silica skeleton structure, and after aging crystallization, the composite template agent is removed through the calcination of a muffle furnace, so that the mesoporous silica material with a pore structure is obtained.
Preferably, the raw materials of the biological synergistic carrier further comprise an aminosilane coupling agent and a basic catalyst; the addition amount of the aminosilane coupling agent is 0.5-1.5% of the mass of the mesoporous silica; the addition amount of the alkaline catalyst is 0.2-0.4% of the mass of the mesoporous silica.
Preferably, the aminosilane coupling agent comprises one or more of gamma-aminopropyl triethoxysilane and gamma-aminopropyl trimethoxysilane; the alkaline catalyst comprises one or more of potassium hydroxide, sodium hydroxide and alkyl sodium chloride.
Preferably, the preparation process of the biological synergistic carrier is as follows:
modification treatment of mesoporous silica: adding mesoporous silica into deionized water, dispersing uniformly, adding an aminosilane coupling agent, stirring and reacting for 5-7 hours under the water bath condition of 60-80 ℃, centrifuging, washing and drying to obtain modified mesoporous silica;
preparation of a biological synergistic carrier: fully dissolving polyvinyl alcohol in deionized water, dispersing modified mesoporous silica in the deionized water, adding a polyvinyl alcohol solution and an alkaline catalyst, stirring and reacting under the water bath condition of 80-90 ℃, and centrifugally washing and drying to obtain the biological synergistic carrier.
Preferably, in the preparation process of the biological synergistic carrier, the dissolution temperature of the polyvinyl alcohol is 50-60 ℃.
By adopting the technical scheme, the mesoporous silica has poor dispersibility, is easy to agglomerate in water and is difficult to play a carrier role, and under the condition of water, an amino silane coupling agent can be hydrolyzed, the contained ethoxy is preferentially hydrolyzed to become hydroxyl, the hydroxyl reacts with the hydroxyl on the surface of the mesoporous silica, and a silicon-oxygen bond is formed by dehydration, so that the effect of modifying the surface of the mesoporous silica is achieved, and the dispersibility of the mesoporous silica is enhanced; and after modification treatment, the physicochemical properties of the mesoporous silica surface are changed, so that good chemical bonding conditions can be provided for the subsequent immobilization of polyvinyl alcohol. The silicon hydroxyl groups contained on the surface of the mesoporous silica can react with the alcohol hydroxyl groups in the polyvinyl alcohol molecules under the catalysis of ion pairs formed by the alkaline catalyst to further form silanol esters, and the polyvinyl alcohol is tightly connected on the surface of the mesoporous silica through the chemical bonding effect, so that the affinity and the fixation of the mesoporous silica to microorganisms are enhanced, and the stability of the small-particle-size mud film particles is improved.
Preferably, water-soluble chitosan is also added in the preparation process of the biological synergistic carrier; the molecular weight of the water-soluble chitosan is 2.0X10 5 ～3.0×10 5 。
Preferably, the addition amount of the water-soluble chitosan is 15-25% of the mass of the polyvinyl alcohol.
By adopting the technical scheme, the polyvinyl alcohol has good water solubility, although the water insolubility is obviously improved after the polyvinyl alcohol is bonded with mesoporous silica, the polyvinyl alcohol is easy to hydrolyze when the water inflow load is large in the sewage treatment process, so that the biological synergistic carrier gradually loses effect, and the service cycle is greatly reduced. The water-soluble chitosan has good biocompatibility, can not inhibit the growth and reproduction of microorganisms, and can form a hydrogen bond with hydroxyl contained in the polyvinyl alcohol, so that a cross-linked network structure is gradually formed on the surface of mesoporous silica, the polyvinyl alcohol can be effectively fixed, and the polyvinyl alcohol is not easy to hydrolyze and lose effect in the sewage treatment process.
Preferably, the active biological agent comprises one or a combination of a plurality of compound COD bacteria, compound denitrifying bacteria, compound phosphorus accumulating bacteria, compound desulphurizing bacteria, compound deoiling bacteria and compound salt tolerant bacteria.
By adopting the technical scheme, the active biological agent is fixed in the biological synergistic carrier through the hanging film, the contained bacterial agent comprises aerobic bacterial and anaerobic bacterial, and the three-layer space structure with external aerobic, middle facultative and internal anaerobic is formed on the biological synergistic carrier, so that the synchronous nitrification and denitrification processes with full coverage and full period can be performed. Meanwhile, the active biological microbial inoculum has strong stress resistance and can resist the sewage with poor nutrition or unbalanced nutrition.
Preferably, the biological synergistic carrier also comprises a nutritional agent accounting for 3 to 8 percent of the mass of the biological synergistic carrier; the nutritional agent comprises one or a combination of more of glucose, sodium citrate, potassium phosphate, sodium chloride, peptone and yeast extract.
By adopting the technical scheme, the biological synergistic carrier already contains nutrient components for the growth and propagation of microorganisms, and no additional nutrition is needed.
In a second aspect, the application also provides a sewage treatment method of small-particle-size mud film particles, which comprises the following steps: the sewage enters an HJDL (short-process denitrification and dephosphorization process) reaction tank through a grid, and is combined with a biological hatching system in the HJDL reaction tank, a biological synergistic carrier and an active biological microbial inoculum are put into the hatching system, so that small-particle-size mud film particles are formed, and impurities in the sewage are removed; the water treated by the HJDL reaction tank enters a secondary sedimentation tank, middle-layer sludge in the secondary sedimentation tank is discharged into the HJDL reaction tank again for treatment, and sewage with qualified water quality index after sedimentation treatment in the secondary sedimentation tank is discharged; the HJDL reaction tank also comprises a stirring device and a reflux device.
By adopting the technical scheme, the HJDL reaction tank contains the biological incubation system, and after sewage enters, flocculent sludge in the sewage is combined with a biological synergistic carrier and an active biological microbial inoculum to gradually form small-particle-size sludge film particles under the action of secreted EPS, so that harmful substances in the sewage are treated and converted. The stirring device in the HJDL reaction tank can enable mud, water and bacteria in the whole HJDL reaction tank to be in a continuous motion state, and the reflux device sends the existing biological synergistic carrier and active biological bacteria to the top end of a hatching system reactor, so that the granulation process of small-particle-size mud film particles is continuously completed.
In summary, the application has the following beneficial effects:
1. the small-particle-size mud film particles comprise the biological synergistic carrier, the raw materials of the biological synergistic carrier comprise mesoporous silica, the porous structure of the mesoporous silica can accommodate the growth and propagation of microorganisms, the mass transfer efficiency is improved, and the high-rigidity framework is also beneficial to keeping the stability of the mud film particles; the mesoporous silica with small particle size is used as a carrier, so that the average particle size of formed mud film particles can be kept in a smaller range, and the internal anaerobic, middle facultative and external aerobic space layered structure can be stably maintained while the specific surface area is high.
2. The small-particle-size mud film particles comprise the biological synergistic carrier, and the biological synergistic carrier also comprises the polyvinyl alcohol, and the polyvinyl alcohol is connected after the surface modification due to poor microorganism adhesion capability of mesoporous silica, so that the high hydrophilicity of the polyvinyl alcohol can provide good microenvironment for the metabolism and proliferation of immobilized microorganisms, and the fixation capability of the biological synergistic carrier to the microorganisms and the structural stability of the small-particle-size mud film particles are improved. Meanwhile, the biological synergistic carrier also comprises water-soluble chitosan, and hydrogen bonds can be formed between the water-soluble chitosan and the polyvinyl alcohol, so that a cross-linked network structure is formed, the water insolubility of the polyvinyl alcohol is enhanced, and the service cycle of the biological synergistic carrier is prolonged.
Detailed Description
Preparation example of mesoporous silica
Preparation example 1-1, mesoporous silica, was prepared according to the following steps:
6g of octadecyl dimethyl ammonium bromide is added into 100ml of deionized water, stirring is carried out until the octadecyl dimethyl ammonium bromide is completely dissolved, meanwhile 14g of polyvinylpyrrolidone is added into 100ml of deionized water, stirring is carried out until the polyvinylpyrrolidone is completely dissolved, two obtained solutions are uniformly mixed, 100g of tetraethoxysilane is added dropwise, stirring is carried out under the water bath condition of 40 ℃ for 24 hours, the reacted solution is transferred into a hydrothermal kettle, and aging crystallization is carried out for 24 hours at 100 ℃. And (3) drying and grinding the obtained product, putting the product into a muffle furnace, calcining the product for 6 hours at 550 ℃, and grinding the product to obtain the mesoporous silica.
Preparation example 1-2, a mesoporous silica, differs from preparation example 1-1 only in that octadecyl dimethyl ammonium bromide was added in an amount of 3g and polyvinylpyrrolidone was added in an amount of 7g.
Preparation examples 1-3, a mesoporous silica, differed from preparation example 1-1 only in that octadecyl dimethyl ammonium bromide was added in an amount of 12g and polyvinylpyrrolidone was added in an amount of 18g.
Preparation examples 1-4, a mesoporous silica, differed from preparation example 1-1 only in that octadecyl dimethyl ammonium bromide was added in an amount of 2g and polyvinylpyrrolidone was added in an amount of 6g.
Preparation examples 1-5, a mesoporous silica, differed from preparation example 1-1 only in that octadecyl dimethyl ammonium bromide was added in an amount of 14g and polyvinylpyrrolidone was added in an amount of 20g.
Preparation example of biological synergistic Carrier
Preparation example 2-1, a biological synergistic carrier, is prepared according to the following method:
100g of mesoporous silica prepared in preparation example 1-1 is added into 500ml of deionized water, uniformly dispersed in water through magnetic stirring, 1g of gamma-aminopropyl triethoxysilane is added, stirring is carried out for reaction for 6 hours under the water bath condition of 70 ℃, and after centrifugation, washing is carried out by using absolute ethanol solution, and the modified mesoporous silica is obtained after drying.
60g of polyvinyl alcohol (average polymerization degree is 1750) is added into 1000ml of deionized water, stirred at 55 ℃ under water bath condition until the polyvinyl alcohol is completely dissolved, then 100g of modified mesoporous silica is uniformly dispersed into 500ml of deionized water, the obtained polyvinyl alcohol aqueous solution and 0.3g of potassium hydroxide are added, stirred and reacted for 10 hours under 90 ℃ water bath condition, after centrifugation, the mixture is washed by deionized water and absolute ethyl alcohol in a crossing way, and then dried at 80 ℃ and ground, thus obtaining the biological synergistic carrier.
Preparation examples 2-2 to 2-5, a bioengineering carrier, differ from preparation example 2-1 only in the proportions of the raw materials used, the specific raw material formulations are shown in Table 1:
TABLE one formulations of preparation examples 2-1 to 2-5
The mesoporous silica used in preparation examples 2-2 to 2-5 was the mesoporous silica produced in preparation example 1-1.
Preparation examples 2-6, a biosynergistic carrier, differed from preparation example 2-1 only in that the mesoporous silica prepared in preparation example 1-1 was replaced with the mesoporous silica prepared in preparation example 1-2 in an equivalent amount.
Preparation 2-7, a biosynergistic carrier, differs from preparation 2-1 only in that the mesoporous silica prepared in preparation 1-1 is replaced with the mesoporous silica prepared in preparation 1-3 in equal amount.
Preparation examples 2-8, a bioengineering carrier, differ from preparation example 2-1 only in that the amount of polyvinyl alcohol added is 40g.
Preparation examples 2-9, a bioengineering carrier, differ from preparation example 2-1 only in that the amount of polyvinyl alcohol added is 80g.
Preparation examples 2-10, a biosynergistic carrier, differed from preparation example 2-1 only in that the mesoporous silica prepared in preparation example 1-1 was replaced with the mesoporous silica prepared in preparation example 1-4 in equal amount.
Preparation examples 2-11, a biosynergistic carrier, differed from preparation example 2-1 only in that the mesoporous silica prepared in preparation example 1-1 was replaced with the mesoporous silica prepared in preparation example 1-5 in equal amount.
Preparation examples 2-12, a bioengineering carrier, differ from preparation example 2-1 only in that 12g of water-soluble chitosan (degree of deacetylation 45%, molecular weight 2.5X10) was further added to the aqueous solution of polyvinyl alcohol 5 )。
Preparation examples 2-13, a bioengineering carrier, differ from preparation example 2-1 only in that no polyvinyl alcohol was added.
Preparation examples 2-14, a biological synergistic carrier, were prepared as follows:
100g of polyvinyl alcohol (average polymerization degree is 1750) is added into 1000ml of deionized water, stirred at 80 ℃ in water bath until the polyvinyl alcohol is completely dissolved, 3g of N, N-dimethylacetamide solution is added, the mixture is uniformly stirred and then added into 500ml of acetone solution for curing reaction, after curing, the obtained gel balls are filtered out, 200ml of 50wt% glutaraldehyde solution and 500ml of 20wt% hydrochloric acid solution are added, the mixture is uniformly stirred and then subjected to chemical crosslinking reaction, and then deionized water is used for washing and drying to obtain the polyvinyl alcohol carrier.
Examples
Example 1, a sewage treatment method of small-particle size sludge membrane particles is carried out according to the following method:
filtering sewage by a grid, flowing into an HJDL (short-process denitrification and dephosphorization process) reaction tank, and combining a biological hatching system in the HJDL reaction tank, and putting the biological synergistic carrier and the active biological microbial inoculum prepared in the preparation example 2-1 with the mass ratio of 1:0.3 into the hatching system, wherein the biological synergistic carrier is also added with a nutritional agent with the mass of 5% of the carrier, so as to form small-particle-size mud film particles and treat impurities in the sewage; the treated sewage flows into a secondary sedimentation tank, middle-layer sludge in the secondary sedimentation tank flows into an HJDL reaction tank again for secondary treatment, and the sewage with qualified water quality index after sedimentation treatment in the secondary sedimentation tank is discharged.
Wherein the active biological bacterial agent is m (composite COD bacteria): m (composite denitrifying bacteria): m (composite phosphorus accumulating bacteria): m (complex desulphurisation): m (composite deoiling bacteria): m (composite salt tolerant bacteria) =2:3:2:1:1:1. The nutritional agent comprises m (sodium citrate): m (glucose): m (potassium phosphate): m (sodium chloride): m (peptone): m (yeast extract) =0.8:1:2:0.2:4:2.
Example 2, a sewage treatment method of small-particle size sludge membrane particles, differs from example 1 only in that the biological synergistic carrier prepared in preparation example 2-1 is replaced by the biological synergistic carrier prepared in preparation example 2-2 in an equivalent amount, and the mass ratio of the biological synergistic carrier prepared in preparation example 2-2 to the active biological microbial inoculum is 1:0.2.
Example 3, a sewage treatment method of small-particle size sludge membrane particles, which is different from example 1 only in that the biological synergistic carrier prepared in preparation example 2-1 is replaced by the biological synergistic carrier prepared in preparation example 2-3 in an equivalent amount, and the mass ratio of the biological synergistic carrier prepared in preparation example 2-3 to the active biological microbial inoculum is 1:0.4.
Example 4, a sewage treatment method of small-sized sludge membrane particles, which is different from example 1 only in that the bioengineering carrier prepared in preparation example 2-1 is replaced with the bioengineering carrier prepared in preparation example 2-6 in the same amount, and the addition amount of the nutrient is 3% of the mass of the bioengineering carrier prepared in preparation example 2-6.
Example 5, a sewage treatment method of small-sized sludge membrane particles, which is different from example 1 only in that the bioengineering carrier prepared in preparation example 2-1 is replaced with the bioengineering carrier prepared in preparation example 2-7 in the same amount, and the addition amount of the nutrient is 8% of the mass of the bioengineering carrier prepared in preparation example 2-6.
Example 6, a sewage treatment method of small-sized sludge membrane particles, differs from example 1 only in that the bioengineering carrier prepared in preparation example 2-1 is replaced with the bioengineering carrier prepared in preparation example 2-4 in an equivalent amount.
Example 7 a sewage treatment method of small-sized sludge membrane particles is different from example 1 only in that the bioengineering carrier prepared in preparation example 2-1 is replaced with the bioengineering carrier prepared in preparation example 2-5 in the same amount.
Example 8, a sewage treatment method of small-sized sludge film particles, differs from example 1 only in that the bioengineering carrier prepared in preparation example 2-1 is replaced with the bioengineering carrier prepared in preparation example 2-8 in an equivalent amount.
Example 9, a sewage treatment method of small-sized sludge film particles, was different from example 1 only in that the bioengineering carrier prepared in preparation example 2-1 was replaced with the bioengineering carrier prepared in preparation example 2-9 in the same amount.
Example 10, a sewage treatment method of small-sized sludge film particles, was different from example 1 only in that the bioengineering carrier prepared in preparation example 2-1 was replaced with the bioengineering carrier prepared in preparation example 2-10 in the same amount.
Example 11 a sewage treatment method of small-sized sludge film particles was different from example 1 only in that the bioengineering carrier prepared in preparation example 2-1 was replaced with the bioengineering carrier prepared in preparation example 2-11 in the same amount.
Example 12 a sewage treatment method of small-sized sludge film particles was different from example 1 only in that the bioengineering carrier prepared in preparation example 2-1 was replaced with the bioengineering carrier prepared in preparation example 2-12 in the same amount.
Example 13, a sewage treatment method of small-particle size sludge film particles, differs from example 1 only in that the mass ratio of the bio-synergistic carrier prepared in preparation example 2-1 to the active biological agent is 1:0.1.
Example 14, a sewage treatment method of small-particle size sludge film particles, differs from example 1 only in that the mass ratio of the biological synergistic carrier prepared in preparation example 2-1 to the active biological agent is 1:0.5.
Example 15, a sewage treatment method of small-sized sludge granules, differs from example 1 only in that no nutrient is added.
Comparative example
Comparative example 1, a sewage treatment method of small-sized sludge film particles, was different from example 1 only in that the bioengineering carrier prepared in preparation example 2-1 was replaced with the bioengineering carrier prepared in preparation example 2-13 in the same amount.
Comparative example 2, a sewage treatment method of small-sized sludge film particles, was different from example 1 only in that the bioengineering carrier prepared in preparation example 2-1 was replaced with the bioengineering carrier prepared in preparation example 2-14 in the same amount.
Comparative example 3, a sewage treatment method of small-sized sludge film particles, is different from example 1 only in that no bio-synergistic carrier is added.
Performance test
1. Average particle size of small particle size mud film particles test: and testing the particle size of the formed small-particle-size mud film particles by adopting a laser particle size analysis method, respectively taking five groups of samples for testing in the testing process, and then taking an average value to obtain the average particle size of the small-particle-size mud film particles.
Wherein the laser particle size analyzer is SALD-2300.
2. COD removal rate in the wastewater: according to GB/T34500.2-2017, part 2 of a chemical analysis method for rare earth waste residues and wastewater: the potassium dichromate titration method in the determination of Chemical Oxygen Demand (COD) tests the COD content in sewage. The COD content of the sewage which participates in the test is selected to be 300-350 mg/L, the COD content of the sewage before and after the treatment of the examples 1-15 and the comparative examples 1-3 is tested, and the sewage inflow is 200m 3 And/d, the treatment time is 7 days, and the COD removal rate is calculated by the following calculation formula:
wherein C is 1 Refers to the COD content of the sewage before treatment, C 2 Refers to the COD content in the treated sewage.
3. The removal rate of nitrogen and phosphorus in the wastewater is as follows: the total phosphorus content in the sewage is measured according to GB/T11893-1989 Spectrophotometry for measuring total phosphorus in Water quality; and determining the total nitrogen content in the sewage according to HJ 636-2012 determination of total nitrogen in water quality alkaline potassium persulfate digestion ultraviolet spectrophotometry. Testing the total phosphorus and total nitrogen content in the sewage before sewage treatment and after sewage treatment in examples 1-15 and comparative examples 1-3, and calculating to obtain the total phosphorus and total nitrogen removal rate, wherein the sewage inflow is 200m 3 And/d, the treatment time is 7 days, and the calculation formula is as follows:
wherein P is 1 Refers to the total phosphorus content, P, in the sewage before treatment 2 Refers to the total phosphorus content in the treated sewage; n (N) 1 Refers to the total phosphorus content, N in the sewage before treatment 2 Refers to the total phosphorus content in the treated sewage.
4. Stability test of small-particle-size mud film particles: and (3) adjusting the COD content of the sewage which participates in the test, namely suddenly adjusting the sewage from the original 300-350 mg/L to 500-550 mg/L in the third day, and testing the stability of the small-particle-size mud film particles by increasing the mud load, wherein the treatment time is still 7 days, and testing the COD removal rate of the sewage according to the method of the test 2.
The results of the above tests are shown in Table II
Test results of sewage treatment of sludge film particles with small particle diameters
According to Table II, in combination with example 1 and comparative example 1, it can be seen that the particle size of the sludge particles of comparative example 1 is significantly larger than that of example 1, the capacity of removing COD, total nitrogen and total phosphorus in sewage is significantly reduced compared with example 1, and after the sewage load is increased, the COD removal rate is significantly reduced, which means that the stability and impurity removal capacity of comparative example 1 are significantly reduced compared with example 1, and the particle size of the sludge particles is significantly larger than that of example 1. The reason for this may be that the biological synergistic carrier in comparative example 1 is not added with polyvinyl alcohol in the preparation process, whereas the mesoporous silica has a relatively smooth surface, and has no large amount of positive charges on the surface, so that the adsorption capacity to microorganisms is relatively weak, the amount of the activated biological agent attached to the mesoporous silica is reduced in the growth process, part of the activated biological agent directly forms aerobic sludge particles with flocculent sludge in sewage in the growth and propagation process, so that the average particle size is obviously increased, and meanwhile, part of the activated biological agent does not use the biological synergistic carrier as a carrier, and is not protected by the mesoporous silica, so that the stability is reduced, and all removal rates are obviously reduced when the sewage load is increased.
As can be seen from the combination of example 1 and comparative example 2, the particle size of the sludge film particles of comparative example 2 is significantly larger than that of example 1, the removal capacity of COD, total nitrogen and total phosphorus in sewage is reduced compared with example 1, and after the sewage load is increased, the reduction of COD removal rate is very significant, which means that the stability and impurity removal capacity of comparative example 2 are significantly reduced compared with example 1, and the particle size of the sludge film particles is significantly larger than that of example 1. The reason for this is probably that in comparative example 2, sewage treatment is performed by using polyvinyl alcohol as a sludge membrane particle of a bio-synergistic carrier, so that the particle size of the polyvinyl alcohol formed in the carrier preparation process is large, and the particle size of the finally formed sludge membrane particle is also large. Meanwhile, when the polyvinyl alcohol is used as a carrier, the high-rigidity framework of mesoporous silica is not provided while the particle size is large, when the load in sewage is suddenly increased, the impact resistance is obviously reduced, and the stability is obviously reduced compared with that of the embodiment 1.
As can be seen from the combination of example 1 and comparative example 3, the particle size of the sludge particles of comparative example 3 is significantly larger than that of example 1, the removal capacity of COD, total nitrogen and total phosphorus in sewage is significantly reduced compared with example 1, and after the sewage load is increased, the removal rate of COD is significantly reduced, which means that the stability and removal capacity of impurities in sewage of comparative example 3 are significantly reduced compared with example 1, and the particle size of the sludge particles is significantly larger than that of example 1. The reason for this is probably that in comparative example 3, no bio-synergistic carrier was added, the active biological agent gradually formed aerobic sludge particles mainly supported by filamentous fungi with flocculent sludge in a bio-hatching system in an HJDL reaction tank, the formed sludge particles were free from limitation of bio-synergistic carrier, the formed particle size was large, and also no mesoporous silica was protected, even if a good space structure was formed, the filamentous fungi did not have strong supporting force when the sludge load was increased, the impact resistance of the aerobic sludge particles was remarkably reduced, and the stability was remarkably reduced as compared with example 1.
As can be seen from the combination of examples 1 and examples 2 to 7, the particle sizes of the sludge particles of examples 2 to 7 are not significantly changed as compared with example 1, the capacity of removing COD, total nitrogen and total phosphorus in sewage is not significantly changed as compared with example 1, and after the sewage load is increased, the COD removal rate is not significantly changed, which means that the particle sizes, stability and capacity of removing impurities in sewage of the sludge particles of examples 2 to 7 are not significantly changed as compared with example 1. The reason for this is probably that examples 2 to 7 were only based on example 1, and the amount of the raw materials used in the preparation of the bioerodible carrier was changed within the required range, which means that the amount of the raw materials used was changed within the required range, and the particle size, stability and the ability to remove the sewage impurities of the formed sludge particles were not significantly affected.
In combination with examples 1, 8 and 9, it can be seen that the particle sizes of the sludge particles of examples 8 and 9 are increased compared with example 1, the removal of COD, total nitrogen and total phosphorus in the wastewater is reduced compared with example 1, the removal rate of COD is reduced after the wastewater load is increased, and the particle sizes of the sludge particles of examples 8 and 9 are also increased compared with example 9, the reduction of COD removal rate is more obvious after the wastewater load is applied, which means that the stability and removal capacity of the sludge particles of examples 8 and 9 are reduced compared with example 1, the reduction of the sludge particles of examples 8 and 9 is more obvious compared with example 9, and the particle sizes of the sludge particles of examples 8 and 9 are larger than example 1. The reason for this may be that example 8 reduces the amount of added polyvinyl alcohol in the preparation of the bio-enhancing carrier, while example 9 increases the amount of added polyvinyl alcohol. When the connection quantity of the polyvinyl alcohol on the surface of the mesoporous silica is reduced, the adsorption capacity of the biological synergistic carrier to the active biological microbial agent is reduced, part of microorganisms automatically form mud film particles, the average particle size is increased, and meanwhile, part of microorganisms lack the protection of the mesoporous silica carrier, so that the stability is reduced. When the number of the polyvinyl alcohol on the surface of the mesoporous silica is increased, on one hand, the adsorption capacity of the polyvinyl alcohol to microorganisms is saturated, and the capacity of removing impurities is not obviously improved by increasing the polyvinyl alcohol, on the other hand, after the content of the polyvinyl alcohol is increased, the microorganisms are accumulated on the surface of the mesoporous silica, the number of the microorganisms in the pore canal is relatively reduced, the particle size is increased, and meanwhile, the stability is reduced.
In combination with examples 1, 10 and 11, it can be seen that the particle size of the sludge particles of example 10 is increased compared with example 1, the removal capacity of COD, total nitrogen and total phosphorus in the wastewater of examples 10 and 11 is decreased compared with example 1, the removal rate of COD is decreased after the wastewater load is increased, and the removal rate of COD is decreased obviously after the wastewater load is applied in example 10 compared with example 9, which means that the stability and removal capacity of the sludge particles of examples 10 and 11 are decreased compared with example 1, and the decrease of the sludge particles of example 10 compared with example 11 is more obvious. The reason for this is probably that the comparative example 10 reduces the amount of the composite template agent added during the preparation of mesoporous silica, resulting in a decrease in the number of channels in the formed mesoporous silica, and further in the formation of sludge particles, the content of microorganisms in the particles decreases, and the microorganisms are mostly attached to the surface of the mesoporous silica or dissociated in sewage to form aerobic sludge particles with large particle diameters, and the stability of the three-layer space structure formed decreases, resulting in a decrease in the detergency, an increase in particle diameter, and a decrease in stability. In example 11, the addition amount of the composite template agent is increased in the preparation process of the mesoporous silica, so that the number of pore channels in the formed mesoporous silica is increased, the rigidity of the mesoporous silica is reduced, and the mesoporous silica is easily damaged by the composite caused by sewage when being used as a biological synergistic carrier, so that the overall stability is reduced.
As can be seen from the combination of example 1 and example 12, the particle size of the sludge particles in example 12 is not significantly changed compared with example 1, the capacity of removing COD, total nitrogen and total phosphorus in sewage is slightly improved compared with example 1, and after the sewage load is increased, the COD removal rate is slightly increased compared with example 1, which means that the particle size, stability and impurity removal capacity of the sludge particles in example 12 are slightly improved compared with example 1. The reason for this is probably that the bio-synergistic carrier adopted in example 12 is further added with water-soluble chitosan in the preparation process, the water-soluble chitosan has good biocompatibility, and can form a crosslinked network structure with polyvinyl alcohol, so that the water-insoluble property of the polyvinyl alcohol is enhanced, the polyvinyl alcohol is not easy to hydrolyze in water, the COD removal rate is not obviously reduced as can be seen from the removal rate of COD after the water inlet load is increased, and the stability of sludge particles is improved.
In combination with examples 1, 13 and 14, it can be seen that the particle size of the sludge particles of examples 13 is increased compared with example 1, the COD removal capacity of examples 12 and 13 is decreased compared with example 1, the COD removal rate is decreased after the sewage load is increased, and the particle size of the sludge particles of examples 13 is increased compared with example 12, which means that the stability and impurity removal capacity of examples 12 and 13 are decreased compared with example 1, and the particle size of the sludge particles of examples 13 is larger than that of example 1. The reason for this may be that the addition amount of the active biological agent was reduced in example 12, resulting in no significant change in the particle size of the formed sludge particles but a decrease in the ability to remove impurities. In example 13, the amount of the active biological agent added is increased, the amount of the added biological synergistic carrier attached active biological agent is saturated, and the excessive bacterial agent automatically forms sludge particles in the sewage, so that the average particle size is increased, and the overall stability is also reduced.
As can be seen from the combination of example 1 and example 15, the particle size of the sludge film particles in example 14 is not significantly changed compared with example 1, the capacity of removing COD, total nitrogen and total phosphorus in sewage is reduced compared with example 1, and after the sewage load is increased, the COD removal rate is reduced, which means that the stability and impurity removal capacity of example 14 are reduced compared with example 1. The reason for this is probably that in example 14, no nutrient is added, the active biological agent in the bioeffective carrier cannot obtain sufficient nutrition to further grow and reproduce, the death rate of the microorganism is increased, the overall stability is reduced, and the capability of removing various impurities in the sewage is reduced.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (10)
1. The small-particle-size sludge film particles are characterized by comprising the following components in percentage by mass: (0.2-0.4) biological synergistic carrier and active biological bacterial agent; the raw materials of the biological synergistic carrier comprise the following components in percentage by mass: (0.5-0.7) mesoporous silica and polyvinyl alcohol.
2. The small-size sludge membrane particle as claimed in claim 1, wherein the small-size sludge membrane particle has a particle size of 100 to 300 μm.
3. The small-particle-diameter mud film particle as set forth in claim 1, wherein the raw materials of the mesoporous silica include (0.1 to 0.3) by mass: 1 a composite template agent and tetraethoxysilane; the composite template agent comprises one or a combination of more of octadecyl dimethyl ammonium bromide, polyvinylpyrrolidone and sodium dodecyl sulfate.
4. A small particle size sludge membrane particle as claimed in claim 3 wherein said mesoporous silica is prepared by the process of: adding the composite template agent into deionized water, stirring to dissolve the composite template agent completely, then adding tetraethoxysilane, and stirring and reacting for 20-24 h under the water bath condition of 35-45 ℃; after the reaction is finished, the mixture is transferred to a hydrothermal kettle for ageing crystallization for 24 to 26 hours, the ageing crystallization product is dried, ground and put into a muffle furnace, calcined for 5 to 7 hours at the temperature of 500 to 600 ℃, and then ground to obtain the mesoporous silica.
5. The small-particle-size sludge membrane particle according to claim 1, wherein the raw materials of the bio-synergistic carrier further comprise an aminosilane coupling agent and a basic catalyst; the addition amount of the aminosilane coupling agent is 0.5-1.5% of the mass of the mesoporous silica; the addition amount of the alkaline catalyst is 0.2-0.4% of the mass of the mesoporous silica.
6. The small particle size sludge membrane granule of claim 5, wherein said bio-enhancing carrier is prepared by the following steps:
modification treatment of mesoporous silica: adding mesoporous silica into deionized water, dispersing uniformly, adding an aminosilane coupling agent, stirring and reacting for 5-7 hours under the water bath condition of 60-80 ℃, centrifuging, washing and drying to obtain modified mesoporous silica;
preparation of a biological synergistic carrier: fully dissolving polyvinyl alcohol in deionized water, dispersing modified mesoporous silica in the deionized water, adding a polyvinyl alcohol solution and an alkaline catalyst, stirring and reacting under the water bath condition of 80-90 ℃, and centrifugally washing and drying to obtain the biological synergistic carrier.
7. The small-particle-size sludge membrane particle according to claim 6, wherein water-soluble chitosan is further added in the preparation process of the biological synergistic carrier; the molecular weight of the water-soluble chitosan is 2.0X10 5 ～3.0×10 5 。
8. The small-particle-size sludge membrane particle according to claim 1, wherein the active biological agent comprises one or a combination of a plurality of composite COD bacteria, composite denitrifying bacteria, composite phosphorus accumulating bacteria, composite desulfurizing bacteria, composite degreasing bacteria and composite salt tolerant bacteria.
9. The small-particle-size mud film particle according to claim 1, wherein the biological synergistic carrier further comprises a nutritional agent accounting for 3-8% of the mass of the biological synergistic carrier; the nutritional agent comprises one or a combination of more of glucose, sodium citrate, potassium phosphate, sodium chloride, peptone and yeast extract.
10. A method for treating sewage of small size sludge membrane particles as claimed in any one of claims 1 to 9, comprising the steps of: the sewage enters an HJDL (short-process denitrification and dephosphorization process) reaction tank through a grid, and is combined with a biological hatching system in the HJDL reaction tank, a biological synergistic carrier and an active biological microbial inoculum are put into the hatching system, so that small-particle-size mud film particles are formed, and impurities in the sewage are removed; the water treated by the HJDL reaction tank enters a secondary sedimentation tank, middle-layer sludge in the secondary sedimentation tank is discharged into the HJDL reaction tank again for treatment, and sewage with qualified water quality index after sedimentation treatment in the secondary sedimentation tank is discharged; the HJDL reaction tank also comprises a stirring device and a reflux device.
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