CN111470614A - Preparation and application of high-accumulation-rate short-cut nitrifying composite bacteria embedded bioactive filler - Google Patents
Preparation and application of high-accumulation-rate short-cut nitrifying composite bacteria embedded bioactive filler Download PDFInfo
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- 239000000945 filler Substances 0.000 title claims abstract description 84
- 241000894006 Bacteria Species 0.000 title claims abstract description 47
- 230000001546 nitrifying effect Effects 0.000 title claims abstract description 24
- 230000000975 bioactive effect Effects 0.000 title claims abstract description 23
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 24
- 239000010865 sewage Substances 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 20
- 239000010802 sludge Substances 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 16
- 238000004132 cross linking Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 229910021580 Cobalt(II) chloride Inorganic materials 0.000 claims description 6
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 6
- 229910018890 NaMoO4 Inorganic materials 0.000 claims description 6
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229910052927 chalcanthite Inorganic materials 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 6
- 229910000357 manganese(II) sulfate Inorganic materials 0.000 claims description 6
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims description 6
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 5
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 5
- 239000011686 zinc sulphate Substances 0.000 claims description 5
- 229910021529 ammonia Inorganic materials 0.000 claims description 4
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical class OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 4
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 4
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 235000013619 trace mineral Nutrition 0.000 claims description 4
- 239000011573 trace mineral Substances 0.000 claims description 4
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- 238000005273 aeration Methods 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 3
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 3
- 230000001376 precipitating effect Effects 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000001488 sodium phosphate Substances 0.000 claims description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 238000012258 culturing Methods 0.000 claims description 2
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- 230000004071 biological effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 6
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002351 wastewater Substances 0.000 abstract description 4
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 14
- 229920002451 polyvinyl alcohol Polymers 0.000 description 14
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 7
- 241001453382 Nitrosomonadales Species 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 5
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- 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 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/109—Characterized by the shape
-
- 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
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
-
- 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
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
- C02F3/108—Immobilising gels, polymers or the like
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
Abstract
Preparation and application of a high-accumulation-rate short-cut nitrifying composite bacteria embedded bioactive filler, belonging to the field of sewage and wastewater treatment. The advanced control means is utilized to optimize and intensively culture the composite bacteria with high AOB bacteria content, then the bacteria embedding technology is utilized to manufacture the short-cut nitrification embedded bioactive filler, namely the reinforced short-cut nitrification composite bacteria embedded bioactive filler, the filler is utilized to establish the short-cut nitrification reaction process, the short-cut nitrification control of the biological treatment of the nitrogen-containing sewage and the waste water can be realized, and the brought result is that the technical process is simple and high-efficiency, and the complex control process is not needed.
Description
The technical field is as follows:
the invention belongs to the field of sewage and wastewater treatment, and particularly relates to preparation and application of a high-accumulation-rate short-cut nitrifying composite bacteria embedded bioactive filler.
Background art:
in the biological treatment of nitrogen-containing sewage and waste water, the nitrification reaction is completed by the combined action of Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB), the AOB oxidizes ammonia nitrogen into nitrite nitrogen, and the NOB further converts nitrite nitrogen into nitrate nitrogen. The short-cut nitrification is also called nitrosation, and the process can reduce 25 percent of nitrification oxygen demand, 40 percent of denitrification carbon source, 50 percent of sludge yield and denitrification tank volume in the whole denitrification treatment process. Based on the advantages, the control of the shortcut nitrification reaction, namely the accumulation rate of high nitrite in the ammonia nitrogen oxidation process, is always the most required in the current biological treatment of nitrogen-containing sewage and wastewater.
At present, in the field of activated sludge process treatment technology, because of a single sludge system, engineering technicians use the difference of the utilization capacity and the rate of the AOB and the NOB to the dissolved oxygen and adopt a method for controlling the dissolved oxygen in an aerobic reaction tank to realize the high-proportion accumulation of nitrite and achieve the purpose of short-cut nitrification, and the low efficiency of the whole ammoxidation reaction is brought. In addition, the short-cut nitrification maintaining system established by the bypass inhibition technology brings a complex and extremely difficult control process of system operation.
The bacterial cell embedding and immobilizing technology can greatly improve the concentration of microorganisms, and common embedding materials comprise polyvinyl alcohol (PVA), agar, K-carrageenan, gelatin, sodium alginate, polyacrylamide, polyurethane and the like. The PVA in the embedding material has the characteristics of no toxicity to microorganisms, good mass transfer performance, difficult biological decomposition after crosslinking, stable property, high mechanical strength, long service life, low price and the like. The qualitative and quantitative addition of AOB bacteria can be realized by a bacteria immobilization technology implemented by an embedding method.
In the embedding technique, the embedded bioactive filler manufactured by the carrier forming technique at present becomes a biological filler product, a labeled product for application and a technique (Z L201410137401.1) with certain advancement.
In recent years, the embedding technical method in (Z L201410137401.1) is adopted to prepare the ammonia oxidation embedded bioactive filler, the reticular straight-barrel-shaped ammonia oxidation embedded bioactive filler is utilized, pilot scale tests and productive application tests are carried out, the filler is found in the preparation and use processes of the filler, and a large promotion space exists in the preparation process, the preparation cost and the complexity of the structural form of the filler.
Therefore, the invention summarizes the manufacturing technical method and the structural form of the enhanced short-cut nitrification embedded bioactive filler, makes substantial progress and improvement, and brings more favorable conditions for the application of the treatment process due to the appearance of a new material.
Disclosure of Invention
The invention aims to optimize and intensively culture the composite bacteria with high AOB (argon oxygen decarburization) bacteria content by using an advanced control means, then, produce the short-cut nitrification embedded bioactive filler, namely the reinforced short-cut nitrification composite bacteria embedded bioactive filler by using a bacteria embedding technology, and establish a short-cut nitrification reaction process by using the filler, so that the short-cut nitrification control of the biological treatment of the nitrogen-containing sewage and the wastewater can be realized, and the brought result is that the process is simple and efficient, and a complex control process is not needed.
The invention relates to a preparation method of an enhanced shortcut nitrification composite bacteria embedded bioactive filler, which is characterized by comprising the following steps:
(1) culturing enhanced optimized shortcut nitrification composite bacteria, namely taking reflux sludge (the water content is 99%) of the existing sewage treatment plant with nitrification capacity, precipitating and concentrating the reflux sludge until the water content is 97%, adding the reflux sludge into a bacteria culture tank, wherein the volume of the reflux sludge is 1/3 of the effective volume of the culture tank, adding ammonia nitrogen under the low-intensity stirring condition of 100r/min, controlling the adding amount of the ammonia nitrogen to be in the range of 16-18 mg/L under the certain pH condition, keeping the state for 24 hours, then, starting to introduce air for aeration, keeping the dissolved oxygen in the range of 0.8-1.2 mg/L, starting to add ammonia nitrogen again under the state, detecting the ammonia nitrogen concentration of the mixed culture solution, controlling the adding amount of the ammonia nitrogen to be in the range of 10-15 mg/L and the pH to be 7.5-8.2, then adding a trace element solution 2m L/L, wherein the trace element solution consists of ZnSO and ZnSO4·7H2O：0.50mg/L，NaMoO4·2H2O：0.12mg/L，CoCl2·6H2O：0.20mg/L，MnSO4·H2O：0.50mg/L，NiCl2·6H2O：0.70mg/L，CuSO4·5H2O：0.60mg/L，FeCl3·6H2O is 0.80 mg/L, continuously runs for 10 days,and dehydrating and concentrating the culture until the water content is 80-85%, and finally forming the shortcut nitrifying bacteria culture.
(2) Preparing the embedding material by mass percent: PVA 20-30%; 50% of a shortcut nitrifying bacteria culture; 15-20% of diatomite; 4-6% of 100-mesh wood activated carbon; 4-5% of calcium carbonate; the rest 1% is a mixture consisting of inorganic substances, and the inorganic substance mixture comprises a mixture consisting of the following substances: sodium phosphate, magnesium sulfate, ferric sulfate, ZnSO4·7H2O、NaMoO4·2H2O、CoCl2·6H2O、NiCl2·6H2O、CuSO4·5H2O、MnSO4·H2O, the mass ratio is: 10: 32: 56: 0.3: 0.2: 0.2: 0.25: 0.25: 0.8;
(3) the manufacturing process of the reinforced embedding material comprises the following steps: dissolving PVA with water at 90 ℃ to prepare a PVA solution with the mass percent concentration of 40-50%; adding other components according to the mass percentage of the embedding material, and uniformly stirring and mixing the components through a high-strength machine to prepare a colloidal embedding material; extruding by using a powerful extruder with a column core extrusion head with the aperture of 10-12mm and the embedded diameter of 6-10mm (10 mm is not taken at the same time), wherein the wall thickness is preferably 1.5-2.5mm, and forming a long strip tubular extrudate; placing the extrudate in a saturated boric acid solution for crosslinking for 4 hours, and cleaning the extrudate with clear water after crosslinking forming to finish the processes of foundation and crosslinking forming; cutting the formed long tube by a cutting machine to obtain barreled or annular filler with the length of 3-5 mm; and (3) placing the cut filler into a 5 wt% sodium sulfate solution for soaking for 4 hours, taking out the filler, and then cleaning the filler with clear water to form the final short-cut nitrifying composite bacteria embedded bioactive filler.
The application of the reinforced short-cut nitrifying composite bacteria embedded bioactive filler is characterized in that the filler is filled into reticular suspension spheres with the diameter of 80-150mm, 40-60% of the filler by volume is filled into each sphere, and the reticular suspension spheres filled with the filler are placed into a reactor containing ammonia nitrogen sewage for short-cut nitrifying reaction.
The invention has the advantages that:
1. the invention enhances the bacterial culture, simultaneously keeps a certain wall thickness of the tubular filler as 1.5-2.5mm, increases the embedded amount of a single filler by nearly 20 percent, and ensures that the embedded amount of the formed filler bacteria is larger;
2. the integral structure of the filler is more stable by increasing the adding proportion (20-30%) of the PVA as the main embedding material, and meanwhile, the adding amount of the PVA is increased and the adding change of other auxiliary materials is combined, so that a tighter micron-sized cavity is formed in the filler embedding body, and the bacteria fixing capacity is more stable;
3. the toughness of the filler is greatly improved by changing the types and the addition proportion of the auxiliary materials, and the stability of the filler in water is also greatly improved by combining the increase of the addition amount of PVA;
4. in the length of the filler cylinder, a circular ring structure is formed by adopting the axial length of 3-5mm, so that the hydraulic condition in the filler is more excellent, the weight of the filler is reduced due to the formation of a short ring form, the filler forms a fluidized state in water better, and the requirement on the hydraulic stirring strength condition is reduced in use;
5. the toughness of the filler is increased and the volume of the filler is reduced, so that the damage caused by mutual collision and friction of the filler in water is well controlled, and the filler is changed from an original rigid structure into an elastic structure due to the absence of an original rigid reticular carrier, so that the structure of the filler is better protected.
6. The characteristics of the short-cut nitrifying composite bacteria subjected to enhanced optimization culture are combined, when the inorganic substance component of the embedding material is prepared, the composition is adjusted, such as ferric sulfate, so that the environment of the embedding material is changed, the characteristics of the short-cut nitrifying composite bacteria subjected to enhanced optimization culture during reaction are better met, and the short-cut nitrifying process is further enhanced.
Drawings
Fig. 1 is a view showing the overall appearance of a barreled or ring-shaped packing formed according to the present invention.
1. An outer wall of a barreled or annular packing; 2. a barrel wall of barreled or annular packing; 3. inner wall of barreled or annular packing.
Detailed Description
The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.
Example 1
1. Preparation of the Filler
Performing short-cut nitrifying bacteria directional strengthening and optimizing culture by taking return sludge of an urban sewage plant as a bacteria source, performing centrifugal dehydration and concentration on the screened short-cut nitrifying bacteria suspension after enrichment culture to obtain a short-cut nitrifying bacteria culture with the water content of 80%, taking return sludge (the water content is 99%) of the existing sewage plant with the nitrifying capacity, precipitating and concentrating the return sludge until the water content is 97%, adding the return sludge into a bacteria culture tank, wherein the volume of the return sludge is 1/3 of the effective volume of the culture tank, adding ammonia nitrogen under the low-intensity stirring condition of 100r/min, controlling the adding amount of the ammonia nitrogen to keep the concentration of free ammonia within the range of 16-18 mg/L under the certain pH condition, keeping the state for 24 hours, then starting to introduce air for aeration, keeping dissolved oxygen within the range of 0.8-1.2 mg/L, starting to add ammonia nitrogen again under the state, detecting the concentration of the ammonia nitrogen in the mixed culture solution, keeping the concentration of the ammonia nitrogen existing concentration of 10-15 mg/L in the mixed solution, controlling the pH within the range of 7.5-8.2, then adding trace element solution L/82, and forming a4·7H2O：0.50mg/L，NaMoO4·2H2O：0.12mg/L，CoCl2·6H2O：0.20mg/L，MnSO4·H2O：0.50mg/L，NiCl2·6H2O：0.70mg/L，CuSO4·5H2O：0.60mg/L，FeCl3·6H2O is 0.80 mg/L, continuously running for 10 days, dehydrating and concentrating the culture until the water content is 80%, and finally forming the shortcut nitrifying bacteria culture.
Dissolving PVA by using water at 90 ℃ to prepare PVA solution with the mass concentration of 40%; according to the formula (the adding amount of PVA is 25%, the culture of shortcut nitrifying bacteria is 50%, the diatomite is 15%, the wood activated carbon with 100 meshes is 4%, the calcium carbonate is 5%, and the rest 1% is sodium phosphate, magnesium sulfate, ferric sulfate and ZnSO4·7H2O、NaMoO4·2H2O、CoCl2·6H2O、NiCl2·6H2O、CuSO4·5H2O、MnSO4·H2Mixing the mixture of O (the mass percentage is 10: 32: 56: 0.3: 0.2: 0.2: 0.25: 0.8)) in proportion; uniformly stirring and mixing the mixture by using a high-strength machine to prepare a gelatinous hydrolytic acidification embedding material; extruding by using a powerful extruder with an aperture of 10-12mm and an embedded 6-8mm column core extrusion head to form a tubular strip extrudate; placing the extrudate in a saturated boric acid solution for crosslinking for 4 hours, and cleaning the extrudate with clear water after crosslinking forming to finish the boric acid crosslinking forming process; cutting the long pipe after molding to obtain a long pipe with the length of 5 mm; and (3) placing the cut filler (1) into a 5% sodium sulfate solution for soaking for 4 hours, taking out the filler, and then cleaning the filler with clear water to form the final short-cut nitrobacteria embedded filler.
The filler was filled into 100mm diameter suspension spheres, each sphere being half filled with filler.
2. Experiment of embedding active filler by short-cut nitrification (preparing ammonia nitrogen content 100 mg/L by municipal sewage)
Adding 1 suspension ball 100 prepared in the step 1 into a short-cut nitrification reactor with an effective volume of 100L, finally forming a short-cut nitrifying bacteria embedded bioactive filler with a filling rate of 20%, a water temperature of 25 +/-2 ℃, an HRT (high resolution transilluminator) of 3h and a pH value of 7.5 +/-0.5, manually preparing water with an ammonia nitrogen content of 100 mg/L as raw water by utilizing municipal sewage, continuously operating the reactor 24 hours a day, and measuring the ammonia nitrogen oxidation amount, the nitrite and the nitrate production amount of the reactor every day, wherein the effluent detection result shows that after the reactor is cultured and recovered for 7 days, the nitrite accumulation rate reaches 93%, the effluent ammonia nitrogen is less than 1 mg/L, and a bioactive filler reaction tank is continuously operated for nearly 8 months, so that the biochemical effect is stable.
Example 2
1. Culture of shortcut nitrifying bacteria and preparation of Filler (same as example 1)
2. Application of short-cut nitrification embedding active filler (municipal sewage)
The reactor continues to the experiment of example 1, the water temperature is 25 +/-2 ℃, the HRT is 3h, the pH is 6.8-7.3 (manual control is removed), municipal sewage is used as raw water, the reactor continuously operates 24 hours a day, the ammonia nitrogen oxidation amount and the nitrite and nitrate production amount of the reactor are measured every day, and the effluent detection result shows that the nitrite accumulation rate reaches 91.6%, the effluent ammonia nitrogen is less than 1 mg/L, the bioactive filler reaction tank continuously operates for nearly 4 months, and the biochemical effect is stable.
The invention has the following effects: 1. the wall thickness of the embedded filler is 1.5-2.5mm, and on the premise of keeping good permeability, the embedded bacteria amount of a single filler (1) is larger, and the bacteria amount in unit volume is increased by 20%; 2. by increasing the adding proportion of the main embedding material polyvinyl alcohol (PVA) and combining the change of the addition of other auxiliary materials, a more compact micron-sized cavity is formed inside the filler embedding body, so that the bacteria fixing capacity is more stable; 3. the toughness of the filler (1) is greatly improved by changing the types and the addition proportion of the auxiliary materials, so that the stability of the filler (1) in water is greatly improved; 4. the length of the cylinder of the filler (1) is 3-5mm, so that the hydraulic condition in the filler (3) is better, the weight of the filler (1) is reduced, the filler (1) forms a fluidized state in water better, and the requirement on the hydraulic stirring strength condition is reduced in use; 5. due to the fact that the toughness of the filler (1) is increased and the volume of the filler is reduced, the filler (1) becomes an elastic body, the abrasion caused by mutual collision and friction in water is small, and the structural protection of the filler (1) is achieved.
Claims (4)
1. Preparation and application of a high-accumulation-rate short-cut nitrifying composite bacteria embedded bioactive filler are characterized by comprising the following steps of:
(1) culturing enhanced optimized shortcut nitrification composite bacteria, namely taking returned sludge (the water content is 99%) of the existing sewage treatment plant with nitrification capacity, precipitating and concentrating the sludge until the water content is 97%, adding the sludge into a bacteria culture tank, wherein the volume of the sludge is 1/3 of the effective volume of the culture tank, adding ammonia nitrogen under the low-intensity stirring condition of 100r/min, controlling the adding amount of the ammonia nitrogen to keep the concentration of free ammonia within the range of 16-18 mg/L under the condition of certain pH, keeping the state for 24 hours, then starting to introduce air for aeration, keeping the dissolved oxygen within the range of 0.8-1.2 mg/L, starting to add the ammonia nitrogen again under the state, detecting the concentration of the ammonia nitrogen in the mixed culture solution, and keeping the concentration of the ammonia nitrogen in the mixed solution within the range of 10-15 mg%L, controlling the pH value at 7.5-8.2, adding 2m L/L of trace element solution consisting of ZnSO4·7H2O：0.50mg/L，NaMoO4·2H2O：0.12mg/L，CoCl2·6H2O：0.20mg/L，MnSO4·H2O：0.50mg/L，NiCl2·6H2O：0.70mg/L，CuSO4·5H2O：0.60mg/L，FeCl3·6H2O is 0.80 mg/L, continuously operating for 10 days, dehydrating and concentrating the culture until the water content is 80-85%, and finally forming the shortcut nitrifying bacteria culture;
(2) preparing the embedding material by mass percent: PVA 20-30%; 50% of a shortcut nitrifying bacteria culture; 15-20% of diatomite; 4-6% of 100-mesh wood activated carbon; 4-5% of calcium carbonate; the rest 1% is a mixture consisting of inorganic substances, and the inorganic substance mixture comprises a mixture consisting of the following substances: sodium phosphate, magnesium sulfate, ferric sulfate, ZnSO4·7H2O、NaMoO4·2H2O、CoCl2·6H2O、NiCl2·6H2O、CuSO4·5H2O、MnSO4·H2O, the mass ratio is: 10: 32: 56: 0.3: 0.2: 0.2: 0.25: 0.25: 0.8;
(3) the manufacturing process of the reinforced embedding material comprises the following steps: dissolving PVA with water at 90 ℃ to prepare a PVA solution with the mass percent concentration of 40-50%; adding other components according to the mass percentage of the embedding material, and uniformly stirring and mixing the components through a high-strength machine to prepare a colloidal embedding material; extruding by using a powerful extruder with a column core extrusion head with the aperture of 10-12mm and the embedded diameter of 6-10mm (10 mm is not taken at the same time) to form a long strip tubular extrudate; placing the extrudate in a saturated boric acid solution for crosslinking for 4 hours, and cleaning the extrudate with clear water after crosslinking forming to finish the processes of foundation and crosslinking forming; cutting the formed long tube by a cutting machine to obtain barreled or annular filler with the length of 3-5 mm; and (3) placing the cut filler into a 5 wt% sodium sulfate solution for soaking for 4 hours, taking out the filler, and then cleaning the filler with clear water to form the final short-cut nitrifying composite bacteria embedded bioactive filler.
2. The preparation method of the enhanced shortcut nitrification composite bacteria embedded bioactive filler according to claim 1, wherein the wall thickness of the barreled or annular filler in the step (3) is 1.5-2.5 mm.
3. The filler embedded with biological activity of the enhanced shortcut nitrification composite bacteria prepared by the method of claim 1 or 2.
4. The application of the reinforced shortcut nitrification composite bacteria embedded bioactive filler prepared according to the method of claim 1 or 2, the application of the reinforced shortcut nitrification composite bacteria embedded bioactive filler, the filler is filled into reticular suspension spheres with the diameter of 80-150mm, 40-60% of the filler is filled in each sphere, and the reticular suspension spheres filled with the filler are placed in a reactor containing ammonia nitrogen sewage for shortcut nitrification reaction.
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| CN111484123A (en) * | 2020-05-06 | 2020-08-04 | 北京工业大学 | Efficient nitrifying embedded bioactive filler and preparation method thereof |
| CN112875862A (en) * | 2021-01-26 | 2021-06-01 | 北京美大环洲工程技术有限责任公司 | Method for regulating and controlling shortcut nitrification-synchronous nitrification and denitrification sewage treatment process based on oxidation-reduction potential and application thereof |
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| CN112919646A (en) * | 2021-01-26 | 2021-06-08 | 北京美大环洲工程技术有限责任公司 | Embedding filler composition and embedded microbial flora active filler prepared from same |
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| CN111484123A (en) * | 2020-05-06 | 2020-08-04 | 北京工业大学 | Efficient nitrifying embedded bioactive filler and preparation method thereof |
| CN111484123B (en) * | 2020-05-06 | 2022-03-29 | 北京工业大学 | Efficient nitrifying embedded bioactive filler and preparation method thereof |
| CN112875862A (en) * | 2021-01-26 | 2021-06-01 | 北京美大环洲工程技术有限责任公司 | Method for regulating and controlling shortcut nitrification-synchronous nitrification and denitrification sewage treatment process based on oxidation-reduction potential and application thereof |
| CN112875845A (en) * | 2021-01-26 | 2021-06-01 | 北京美大环洲工程技术有限责任公司 | Sewage treatment process combining anaerobic hydrolysis, short-cut nitrification, synchronous nitrification and denitrification and aerobic oxidation |
| CN112919646A (en) * | 2021-01-26 | 2021-06-08 | 北京美大环洲工程技术有限责任公司 | Embedding filler composition and embedded microbial flora active filler prepared from same |
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