CN117865364B - Sludge activator, autotrophic denitrification sludge and preparation method and application thereof - Google Patents
Sludge activator, autotrophic denitrification sludge and preparation method and application thereof Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 101
- 230000001651 autotrophic effect Effects 0.000 title claims abstract description 36
- 239000012190 activator Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 26
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims abstract description 10
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 10
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 10
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 10
- 159000000003 magnesium salts Chemical class 0.000 claims abstract description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 10
- 239000010452 phosphate Substances 0.000 claims abstract description 10
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000007864 aqueous solution Substances 0.000 claims description 36
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 20
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical group [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 18
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical group [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 16
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 15
- 235000010413 sodium alginate Nutrition 0.000 claims description 15
- 239000000661 sodium alginate Substances 0.000 claims description 15
- 229940005550 sodium alginate Drugs 0.000 claims description 15
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 14
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 14
- 241000237502 Ostreidae Species 0.000 claims description 13
- 235000020636 oyster Nutrition 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 239000011780 sodium chloride Substances 0.000 claims description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 11
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 10
- 239000004327 boric acid Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical group [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 10
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 10
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 9
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 9
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 9
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 9
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 9
- 239000004317 sodium nitrate Substances 0.000 claims description 8
- 235000010344 sodium nitrate Nutrition 0.000 claims description 8
- 238000004132 cross linking Methods 0.000 claims description 7
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical group [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims description 7
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims description 7
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical group [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 4
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 239000004323 potassium nitrate Substances 0.000 claims description 2
- 235000010333 potassium nitrate Nutrition 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 30
- 239000010865 sewage Substances 0.000 abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 15
- 241000605118 Thiobacillus Species 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 230000001580 bacterial effect Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 6
- 244000005700 microbiome Species 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 238000011049 filling Methods 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 238000011197 physicochemical method Methods 0.000 description 3
- 238000010170 biological method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 230000004060 metabolic process Effects 0.000 description 2
- 230000001546 nitrifying effect Effects 0.000 description 2
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical group [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000002503 metabolic effect Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 238000004172 nitrogen cycle Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to the technical field of sewage treatment materials, and particularly discloses a sludge activator, autotrophic denitrification sludge and a preparation method and application thereof. The sludge activator provided by the invention comprises the following raw material components in parts by weight: 48-52 parts of phosphate, 48-50 parts of bicarbonate, 8-10 parts of soluble magnesium salt, 0.8-1.2 parts of soluble sulfate, 58-60 parts of thiosulfate and 4000-9000 parts of nitrate. The method breaks through the traditional heterotrophic denitrification process, activates autotrophic denitrifying bacteria thiobacillus in the sludge into dominant bacterial groups by selecting a specific activator, and can ensure excellent total nitrogen removal rate on the premise of not adding additional carbon sources when being applied to sewage treatment, and reduces the running cost to a certain extent and the risk of secondary pollution of effluent.
Description
Technical Field
The invention relates to the technical field of sewage treatment materials, in particular to a sludge activator, autotrophic denitrification sludge and a preparation method and application thereof.
Background
The nitrogen in the body of water remains relatively balanced in the natural nitrogen cycle. Due to the frequent interference of human activities, the use and migration of nitrogen are accelerated, so that a large amount of nitrogen-containing pollutants enter the water body, and the water ecological environment is a main threat. Point source emissions and surface source pollution are the main sources of high nitrogen input for urban water ecosystems. On one hand, the transitional use of agricultural nitrogenous fertilizers causes residues to enter a surface water system under the scouring of rainfall runoff, or infiltrates into the underground water system through leaching, so that water eutrophication is caused, and meanwhile, the urban drinking water safety is seriously compromised. On the other hand, the huge discharge amount of industrial wastewater and municipal wastewater is far beyond the self-cleaning capability of natural water bodies, and the water environment deterioration is further aggravated. In the face of increasing sewage discharge and increasingly sensitive and fragile water ecological environments, innovative and upgrading of sewage treatment technology is needed to realize deep denitrification of sewage.
At present, urban domestic sewage in China generally presents the characteristic of low carbon nitrogen ratio, so that the denitrification efficiency of the traditional heterotrophic denitrification is reduced. In order to make the effluent reach the emission standard, a sewage treatment plant generally adopts a mode of adding an external organic carbon source to improve the denitrification performance. But this increases the treatment costs and at the same time the risk of secondary pollution.
For the existing nitrogenous wastewater, the treatment methods commonly used at present comprise a physicochemical method and a biological method. Physical methods include stripping, adsorption, membrane separation techniques, etc., chemical methods include chemical precipitation and break point chlorination, biological methods include heterotrophic denitrification and autotrophic denitrification techniques; but they all have some problems in the application process, such as: the cost of treating the nitrogen-containing wastewater by the physicochemical method is high, and intermediate products and byproducts which are difficult to degrade are also generated in the treatment process, so that secondary pollution is generated, and the technology and equipment related to the physicochemical method are relatively complex, and require professional technicians to operate and maintain, so that the treatment difficulty and cost are increased; the traditional biological denitrification process gradually exposes a plurality of defects along with the continuous development of society, the generation period of nitrifying bacteria is long, the activity is greatly influenced by temperature, and the efficient nitrifying rate is difficult to maintain in winter; secondly, increasing sewage quantity, so that aeration energy consumption required in the nitration reaction process and the running cost of a subsequent treatment unit are increased; finally, the sewage treatment plant is easy to generate a large amount of excess sludge, which is difficult to dispose. Therefore, as the amount of sewage received by urban sewage treatment plants is larger and larger, the types and the concentrations of pollutants are higher and higher, the traditional biological denitrification process is difficult to meet the requirements gradually, and thus the need for a new biological denitrification process for sewage is urgent.
Disclosure of Invention
In view of the above, the invention provides a sludge activator, autotrophic denitrification sludge, a preparation method and application thereof, and breaks through the traditional heterotrophic denitrification process, and the autotrophic denitrifying bacteria thiobacillus in the sludge is activated into dominant bacterial groups by selecting phosphate, bicarbonate, soluble magnesium salt, soluble sulfate, thiosulfate and nitrate as the sludge activator, so that the autotrophic denitrifying bacteria thiobacillus is applied to sewage treatment, excellent total nitrogen removal rate can be ensured without adding additional carbon sources, the running cost is reduced to a certain extent, and the risk of secondary pollution of effluent is reduced.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
The invention provides a sludge activator, which comprises the following raw material components in parts by weight: 48-52 parts of phosphate, 48-50 parts of bicarbonate, 8-10 parts of soluble magnesium salt, 0.8-1.2 parts of soluble sulfate, 58-60 parts of thiosulfate and 4000-9000 parts of nitrate.
Compared with the prior art, the sludge activator provided by the invention has the advantages that phosphate and thiosulfate provide a phosphorus source and a sulfur source as nutrient substances necessary for the growth of thiobacillus; the bicarbonate can maintain the pH environment of the sludge and promote the proper growth range of the thiobacillus; the soluble magnesium salt can provide trace elements; the soluble sulfate can be used as a catalyst to promote the metabolism of thiobacillus; the nitrate can provide an energy source and improve the denitrification capability of the thiobacillus.
According to the invention, phosphate, bicarbonate, soluble magnesium salt, soluble sulfate, thiosulfate and nitrate are selected as sludge activating agents, specific components are utilized to activate sludge, a compound strengthening effect is achieved among the components, and autotrophic denitrifying bacteria-thiobacilli in the sludge can be activated by providing nutrients, improving environmental conditions and providing specific microelements and specific energy sources; the method breaks through the traditional heterotrophic denitrification process, activates autotrophic denitrifying bacteria thiobacillus in the sludge into dominant bacterial groups by selecting a specific activator, and can ensure excellent total nitrogen removal rate on the premise of not adding additional carbon sources when being applied to sewage treatment, and reduces the running cost to a certain extent and the risk of secondary pollution of effluent.
Preferably, the phosphate is potassium dihydrogen phosphate.
Preferably, the bicarbonate is sodium bicarbonate.
Preferably, the soluble magnesium salt is magnesium chloride.
Preferably, the soluble sulfate is ferric sulfate.
Preferably, the thiosulfate is sodium thiosulfate.
Preferably, the nitrate is sodium nitrate or potassium nitrate.
The preferred type of sludge activator is advantageous for further increasing the total nitrogen removal rate.
The second aspect of the present invention provides a method for preparing the sludge activator, comprising the steps of:
and uniformly mixing the weighed phosphate, bicarbonate, soluble magnesium salt, soluble sulfate, thiosulfate and nitrate to obtain the sludge activator.
The third aspect of the invention provides a method for preparing autotrophic denitrification sludge, comprising the following steps:
And uniformly mixing the sludge and the sludge activator to obtain the autotrophic denitrification sludge.
Preferably, the mass volume ratio of the sludge to the sludge activator is 1L (41.63-97.13 g).
The optimized proportion is favorable for further promoting the growth of thiobacillus in the sludge and improving the success rate of activation.
Preferably, the sludge concentration of the sludge is 19g/L-21g/L.
The invention further limits the sludge concentration of the sludge, and is beneficial to improving the growth of thiobacillus in the sludge.
The fourth aspect of the invention provides autotrophic denitrification sludge, which is prepared by the preparation method of the autotrophic denitrification sludge.
The fifth aspect of the present invention provides a method for preparing an embedding material, comprising the steps of:
step a, carrying out centrifugal concentration on the autotrophic denitrification sludge, and uniformly mixing the obtained concentrated activated sludge with oyster powder to obtain an embedding body;
Step b, uniformly mixing the embedding body, the sulfur powder, the polyvinyl alcohol aqueous solution and the sodium alginate aqueous solution, drying, and grinding to obtain embedding body particles with the particle size of 5-9 mm;
and c, uniformly mixing the embedding body particles, boric acid and sodium chloride aqueous solution, crosslinking and fixing at the temperature of 2-6 ℃, filtering and drying to obtain the embedding material.
According to the preparation method of the embedding material, the autotrophic denitrification sludge and the oyster powder are mixed, and the oyster powder can provide nutrients for microorganisms in the autotrophic denitrification sludge and promote the metabolic activity of the microorganisms, so that the total nitrogen removal rate is improved; polyvinyl alcohol is used as an organic matter with slow release property and can be utilized by the growth and metabolism of microorganisms; the sodium alginate can enable microorganisms to be fixed in the network space of the sodium alginate by embedding the microorganisms, so that the stability and activity of the microorganisms are improved; according to the invention, the autotrophic denitrification sludge, the oyster powder, the polyvinyl alcohol and the sodium alginate are mixed for treatment, so that the total nitrogen removal rate of the autotrophic denitrification sludge on sewage can be effectively improved, and the embedding material prepared by the preparation method of the embedding material provided by the invention has good sedimentation property, long service life and high total nitrogen removal rate on sewage.
Preferably, in the step a, the mass ratio of the concentrated activated sludge to the oyster powder is 1 (3.4-3.6).
Preferably, in the step b, the mass concentration of the polyvinyl alcohol aqueous solution is 9% -11%.
Preferably, in the step b, the mass concentration of the sodium alginate aqueous solution is 1% -3%.
Preferably, in the step b, the mass ratio of the embedding body, the sulfur powder, the polyvinyl alcohol aqueous solution and the sodium alginate aqueous solution is 1 (0.6-1.2): 0.6-2.4): 0.3-0.6.
Preferably, in the step c, the mass concentration of the sodium chloride aqueous solution is 1% -3%.
Preferably, in the step c, the mass ratio of the embedded particles to the boric acid to the sodium chloride aqueous solution is 1 (0.5-0.8): 2-5.
Preferably, in step c, the time for the crosslinking fixation is 19h to 21h.
Preferably, the embedding material has a density of 1.16g/cm 3-1.18g/cm3.
The sixth aspect of the invention provides an embedding material prepared by the preparation method of the embedding material.
Drawings
FIG. 1 is a schematic diagram of an experimental apparatus for treating wastewater with embedding materials;
Wherein, 1 is the switch board, 2 is the equalizing basin, 3 is the water inlet pump, 4 is the recoil waste water pond, 5 is the inlet tube, 6 is the recoil gas vent, 7 is the filler bin, 8 is the charge pump, 9 is the dosing tank, 10 is the outlet pipe, 11 is the drain pipe, 12 is the recoil water pipe, 13 is the recoil trachea, 14 is the sedimentation tank.
Detailed Description
The following description of the present invention will be made clearly and fully with the understanding that the specific examples described herein are intended to provide a thorough understanding of the present invention and are not intended to limit the invention to the embodiments described.
Example 1
The embodiment provides a preparation method of an embedding material, which comprises the following steps:
Step a, carrying out centrifugal concentration on autotrophic denitrification sludge, uniformly mixing the obtained concentrated activated sludge with oyster powder, and adsorbing for 30min to obtain an embedding body; wherein the mass ratio of the concentrated activated sludge to the oyster powder is 1:3.6;
Step b, uniformly mixing the embedding body, sulfur powder, 9wt% of polyvinyl alcohol aqueous solution and 1% of sodium alginate aqueous solution, drying, and grinding to obtain embedding body particles with the particle size of 9mm; wherein the mass ratio of the embedding body to the sulfur powder to the 9wt% polyvinyl alcohol aqueous solution to the 1% sodium alginate aqueous solution is 1:0.6:0.6:0.6;
Step c, uniformly mixing the embedding body particles, boric acid and 1wt% sodium chloride aqueous solution, crosslinking and fixing for 19h at 2 ℃, filtering and drying to obtain an embedding material; wherein the mass ratio of the embedded particles to boric acid to 1wt% sodium chloride aqueous solution is 1:0.5:5;
the preparation method of the autotrophic denitrification sludge comprises the following steps:
uniformly mixing sludge with the sludge concentration of 19g/L with a sludge activator to obtain autotrophic denitrification sludge; the mass volume ratio of the sludge to the sludge activator is 1L to 41.63g;
The sludge activator comprises the following raw material components in parts by weight: 52 parts of monopotassium phosphate, 48 parts of sodium bicarbonate, 10 parts of magnesium chloride, 0.8 part of ferric sulfate, 60 parts of sodium thiosulfate and 4000 parts of sodium nitrate.
Example 2
The embodiment provides a preparation method of an embedding material, which comprises the following steps:
step a, carrying out centrifugal concentration on autotrophic denitrification sludge, uniformly mixing the obtained concentrated activated sludge with oyster powder, and adsorbing for 30min to obtain an embedding body; wherein the mass ratio of the concentrated activated sludge to the oyster powder is 1:3.4;
Step b, uniformly mixing the embedding body, sulfur powder, 11wt% of polyvinyl alcohol aqueous solution and 3% of sodium alginate aqueous solution, drying, and grinding to obtain embedding body particles with the particle size of 5 mm; wherein the mass ratio of the embedding body to the sulfur powder to the 11wt% polyvinyl alcohol aqueous solution to the 3% sodium alginate aqueous solution is 1:1.2:2.4:0.3;
Step c, uniformly mixing the embedding body particles, boric acid and 3wt% sodium chloride aqueous solution, crosslinking and fixing for 21 hours at 6 ℃, filtering and drying to obtain an embedding material; wherein the mass ratio of the embedded particles to boric acid to 3wt% sodium chloride aqueous solution is 1:0.8:2;
the preparation method of the autotrophic denitrification sludge comprises the following steps:
uniformly mixing sludge with the sludge concentration of 21g/L with a sludge activator to obtain autotrophic denitrification sludge; the mass volume ratio of the sludge to the sludge activator is 1L:97.13g;
The sludge activator comprises the following raw material components in parts by weight: 48 parts of monopotassium phosphate, 50 parts of sodium bicarbonate, 8 parts of magnesium chloride, 1.2 parts of ferric sulfate, 58 parts of sodium thiosulfate and 9000 parts of sodium nitrate.
Example 3
The embodiment provides a preparation method of an embedding material, which comprises the following steps:
Step a, carrying out centrifugal concentration on autotrophic denitrification sludge, uniformly mixing the obtained concentrated activated sludge with oyster powder, and adsorbing for 30min to obtain an embedding body; wherein the mass ratio of the concentrated activated sludge to the oyster powder is 1:3.5;
step b, uniformly mixing the embedding body, sulfur powder, 10wt% of polyvinyl alcohol aqueous solution and 2% of sodium alginate aqueous solution, drying, and grinding to obtain embedding body particles with the particle size of 7 mm; wherein the mass ratio of the embedding body to the sulfur powder to the 10wt% polyvinyl alcohol aqueous solution to the 2% sodium alginate aqueous solution is 1:1.0:2.0:0.4;
Step c, uniformly mixing the embedding body particles, boric acid and 2wt% sodium chloride aqueous solution, crosslinking and fixing for 20 hours at the temperature of 2 ℃, filtering and drying to obtain an embedding material; wherein the mass ratio of the embedded particles to boric acid to 2wt% sodium chloride aqueous solution is 1:0.6:3;
the preparation method of the autotrophic denitrification sludge comprises the following steps:
Uniformly mixing sludge with the sludge concentration of 20g/L with a sludge activator to obtain autotrophic denitrification sludge; the mass volume ratio of the sludge to the sludge activator is 1L to 53g;
The sludge activator comprises the following raw material components in parts by weight: 50 parts of monopotassium phosphate, 49 parts of sodium bicarbonate, 9 parts of magnesium chloride, 1 part of ferric sulfate, 59 parts of sodium thiosulfate and 5000 parts of sodium nitrate.
Comparative example 1
Compared with example 1, this comparative example differs from example 1 in that: replacing potassium dihydrogen phosphate with equivalent sodium sulfate;
Other procedure was the same as in example 1.
Comparative example 2
Compared with example 1, this comparative example differs from example 1 in that: replacing magnesium chloride with an equivalent amount of ferric chloride;
Other procedure was the same as in example 1.
Comparative example 3
Compared with example 1, this comparative example differs from example 1 in that: replacing ferric sulfate with equivalent ferric nitrate;
Other procedure was the same as in example 1.
Comparative example 4
Compared with example 1, this comparative example differs from example 1 in that: the dosage of sodium bicarbonate is increased, and the specific steps are as follows:
The sludge activator comprises the following raw material components in parts by weight: 52 parts of monopotassium phosphate, 100 parts of sodium bicarbonate, 10 parts of magnesium chloride, 0.8 part of ferric sulfate, 60 parts of sodium thiosulfate and 4000 parts of sodium nitrate;
Other procedure was the same as in example 1.
Comparative example 5
Compared with example 1, this comparative example differs from example 1 in that: the dosage of the ferric sulfate is increased, and the method concretely comprises the following steps:
The sludge activator comprises the following raw material components in parts by weight: 52 parts of monopotassium phosphate, 48 parts of sodium bicarbonate, 10 parts of magnesium chloride, 5 parts of ferric sulfate, 60 parts of sodium thiosulfate and 4000 parts of sodium nitrate;
Other procedure was the same as in example 1.
Comparative example 6
Compared with example 1, this comparative example differs from example 1 in that: the dosage of sodium thiosulfate is increased, and the concrete steps are as follows:
The sludge activator comprises the following raw material components in parts by weight: 52 parts of monopotassium phosphate, 48 parts of sodium bicarbonate, 10 parts of magnesium chloride, 0.8 part of ferric sulfate, 100 parts of sodium thiosulfate and 4000 parts of sodium nitrate;
Other procedure was the same as in example 1.
Application example
Selecting an anoxic section mud water sample of a sewage treatment plant for experiments, detecting the total nitrogen concentration of raw water to be 60mg/L, filling the embedding materials prepared in the examples 1-3 and the comparative examples 1-6 into a filling bin 7 of the device shown in fig. 1, wherein the hydraulic retention time of the device is 2h, the filling volume of the embedding material in the device is 500mL, the temperature of water entering is controlled to be 25-30 ℃ during operation, the pH is controlled to be 7-8, and detecting the total nitrogen removal rate and the total nitrogen concentration change of 2h in sewage, wherein the total nitrogen detection method refers to the standard HJ 636-2012;
The specific detection results are shown in Table 1:
TABLE 1
The autotrophic denitrification sludge prepared by the sludge activator provided by the embodiment of the invention is further prepared into an embedding material, and is applied to sewage treatment, so that excellent total nitrogen removal rate can be ensured on the premise of no additional carbon source, the running cost is reduced to a certain extent, and the risk of secondary pollution of effluent is reduced.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, but any modifications, equivalents, or improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (6)
1. The preparation method of the autotrophic denitrification sludge is characterized by comprising the following steps:
Uniformly mixing the sludge and a sludge activator to obtain autotrophic denitrification sludge;
the sludge activator comprises the following raw material components in parts by weight: 48-52 parts of phosphate, 48-50 parts of bicarbonate, 8-10 parts of soluble magnesium salt, 0.8-1.2 parts of soluble sulfate, 58-60 parts of thiosulfate and 4000-9000 parts of nitrate;
Wherein the phosphate is monopotassium phosphate; the bicarbonate is sodium bicarbonate; the soluble magnesium salt is magnesium chloride; the soluble sulfate is ferric sulfate; the thiosulfate is sodium thiosulfate; the nitrate is sodium nitrate or potassium nitrate;
The sludge activator comprises the following preparation steps: uniformly mixing the weighed phosphate, bicarbonate, soluble magnesium salt, soluble sulfate, thiosulfate and nitrate to obtain the sludge activator;
The mass volume ratio of the sludge to the sludge activator is 1L (41.63-97.13 g);
The sludge concentration of the sludge is 19g/L-21g/L.
2. An autotrophic denitrification sludge, characterized in that the autotrophic denitrification sludge is prepared by the preparation method of the autotrophic denitrification sludge according to claim 1.
3. A method for preparing an embedding material, comprising the steps of:
Step a, carrying out centrifugal concentration on the autotrophic denitrification sludge according to claim 2, and uniformly mixing the obtained concentrated activated sludge with oyster powder to obtain an embedding body;
Step b, uniformly mixing the embedding body, the sulfur powder, the polyvinyl alcohol aqueous solution and the sodium alginate aqueous solution, drying, and grinding to obtain embedding body particles with the particle size of 5-9 mm;
and c, uniformly mixing the embedding body particles, boric acid and sodium chloride aqueous solution, crosslinking and fixing at the temperature of 2-6 ℃, filtering and drying to obtain the embedding material.
4. The method for preparing an embedding material according to claim 3, wherein in the step a, the mass ratio of the concentrated activated sludge to the oyster powder is 1 (3.4-3.6); and/or
In the step b, the mass concentration of the polyvinyl alcohol aqueous solution is 9% -11%; and/or
In the step b, the mass concentration of the sodium alginate aqueous solution is 1% -3%.
5. The method for preparing an embedding material according to claim 3, wherein in the step b, the mass ratio of the embedding body, the sulfur powder, the polyvinyl alcohol aqueous solution and the sodium alginate aqueous solution is 1 (0.6-1.2): (0.6-2.4): (0.3-0.6); and/or
In the step c, the mass concentration of the sodium chloride aqueous solution is 1% -3%; and/or
In the step c, the mass ratio of the embedded body particles to the boric acid to the sodium chloride aqueous solution is 1 (0.5-0.8): 2-5; and/or
In the step c, the time for crosslinking and fixing is 19-21 h.
6. An embedding material, characterized in that it is prepared by the method for preparing an embedding material according to any one of claims 3 to 5.
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| GB464982A (en) * | 1935-10-26 | 1937-04-26 | Rust Proofing Company Of Canad | Process of cleaning and coating metal surfaces |
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| CN101580307A (en) * | 2009-06-18 | 2009-11-18 | 上海交通大学 | Method for constructing demersal microorganism layer on substrate sludge layer in eutrophic water |
| CN102747439A (en) * | 2011-04-21 | 2012-10-24 | 中国科学院合肥物质科学研究院 | Disperse nanocomposite and preparation method thereof |
| CN111944799A (en) * | 2020-07-24 | 2020-11-17 | 河北科技大学 | Preparation method and application of immobilized particles embedded with thiobacillus denitrificans |
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|---|---|---|---|---|
| GB464982A (en) * | 1935-10-26 | 1937-04-26 | Rust Proofing Company Of Canad | Process of cleaning and coating metal surfaces |
| CN101223280A (en) * | 2005-07-18 | 2008-07-16 | 巴斯福股份公司 | Use of dimethyl disulfide for methionine production in microorganisms |
| CN101580307A (en) * | 2009-06-18 | 2009-11-18 | 上海交通大学 | Method for constructing demersal microorganism layer on substrate sludge layer in eutrophic water |
| CN102747439A (en) * | 2011-04-21 | 2012-10-24 | 中国科学院合肥物质科学研究院 | Disperse nanocomposite and preparation method thereof |
| CN111944799A (en) * | 2020-07-24 | 2020-11-17 | 河北科技大学 | Preparation method and application of immobilized particles embedded with thiobacillus denitrificans |
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