CN113735246A - Foaming light filler for synchronously removing nitrogen and phosphorus and preparation method thereof - Google Patents
Foaming light filler for synchronously removing nitrogen and phosphorus and preparation method thereof Download PDFInfo
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- CN113735246A CN113735246A CN202110911660.5A CN202110911660A CN113735246A CN 113735246 A CN113735246 A CN 113735246A CN 202110911660 A CN202110911660 A CN 202110911660A CN 113735246 A CN113735246 A CN 113735246A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 239000000945 filler Substances 0.000 title claims abstract description 50
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 39
- 239000011574 phosphorus Substances 0.000 title claims abstract description 39
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 33
- 238000005187 foaming Methods 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000006028 limestone Substances 0.000 claims abstract description 19
- 235000019738 Limestone Nutrition 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 17
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011028 pyrite Substances 0.000 claims abstract description 16
- 229910052683 pyrite Inorganic materials 0.000 claims abstract description 16
- 239000006260 foam Substances 0.000 claims abstract description 12
- 239000004088 foaming agent Substances 0.000 claims abstract description 12
- 230000001360 synchronised effect Effects 0.000 claims abstract description 12
- 239000003381 stabilizer Substances 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005469 granulation Methods 0.000 claims description 6
- 230000003179 granulation Effects 0.000 claims description 6
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 6
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 6
- AMVQGJHFDJVOOB-UHFFFAOYSA-H aluminium sulfate octadecahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O AMVQGJHFDJVOOB-UHFFFAOYSA-H 0.000 claims description 5
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 5
- 235000013539 calcium stearate Nutrition 0.000 claims description 5
- 239000008116 calcium stearate Substances 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000005550 wet granulation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 12
- 244000005700 microbiome Species 0.000 abstract description 8
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 abstract description 6
- 239000011148 porous material Substances 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract 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 abstract description 3
- 229910000360 iron(III) sulfate Inorganic materials 0.000 abstract description 3
- 229910052717 sulfur Inorganic materials 0.000 description 14
- 239000011593 sulfur Substances 0.000 description 14
- 239000010865 sewage Substances 0.000 description 9
- 230000001651 autotrophic effect Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010170 biological method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- IBIRZFNPWYRWOG-UHFFFAOYSA-N phosphane;phosphoric acid Chemical compound P.OP(O)(O)=O IBIRZFNPWYRWOG-UHFFFAOYSA-N 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 229910052952 pyrrhotite Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910021646 siderite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 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
-
- 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
- C02F3/107—Inorganic materials, e.g. sand, silicates
-
- 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
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/109—Characterized by the shape
-
- 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
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Biological Treatment Of Waste Water (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a synchronous nitrogen and phosphorus removal foaming light filler which is characterized by comprising the following components in percentage by weight: 40-70% of sulfur powder, 10-30% of pyrite powder, 1-10% of limestone, 0.1-5% of foaming agent and 0.1-5% of foam stabilizer. The invention also discloses a preparation method of the filler. The light filler for synchronously denitrifying and dephosphorizing has the advantages of high porosity, large specific surface area, light weight, high reaction activity and the like, and the pore diameter is suitable for the inhabitation and propagation of microorganisms. Meanwhile, pyrite and aluminum sulfate are added into the filler, and aluminum sulfate and ferric sulfate are generated after reaction, so that the phosphorus removal effect is good.
Description
Technical Field
The invention belongs to the technical field of preparation of environment functional materials, and particularly relates to a foaming light filler for synchronously removing nitrogen and phosphorus and a preparation method thereof.
Background
In recent years, due to rapid development of national economy, improvement of human living standard, acceleration of urbanization process, overuse of agricultural fertilizers and the like, a large amount of domestic sewage containing nitrogen and phosphorus and industrial sewage are discharged into water bodies, and water eutrophication is more and more serious. Therefore, the advanced treatment of nitrogen and phosphorus in sewage becomes a focus problem in the environmental protection industry.
At present, sewage treatment methods can be roughly divided into a physical method, a biological method and a chemical method, wherein the biological method has the lowest relative cost and the highest cost performance and the most extensive application. The heterotrophic denitrification technology is widely used for removing nitrogen in sewage, and chemical phosphorus removal is the most effective method for removing phosphorus from sewage. Because a large amount of carbon sources are required to be added in the iso-aerobic denitrification, the method has the defects of high COD (chemical oxygen demand) of effluent, resource waste and the like. Coagulant addition is needed for chemical phosphorus removal, and the problems of high cost, complex control and management and the like exist. Compared with the prior art, the heterotrophic denitrification of sulfur autotrophic denitrification is a low-consumption and high-efficiency water nutrient extraction technology, and has attracted much attention in recent years. The sulfur autotrophic sulfur source may be made a feedstock for the reactor. More and more researches are carried out on the nitrogen and phosphorus removal of sewage treatment by adopting natural mineral materials such as pyrrhotite, siderite and the like, and certain effects are achieved. But the denitrification and dephosphorization rate is generally low, the denitrification and dephosphorization needs longer hydraulic retention time, and the large-scale application is limited.
At present, the sulfur-limestone autotrophic denitrification system is most widely applied to synchronous nitrogen and phosphorus removal of sewage by adopting a sulfur autotrophic denitrification process. The system adopts sulfur as an autotrophic denitrification process of an electron donor, does not need to additionally add a carbon source, and has the advantages of small sludge production amount, low cost, simple process and the like. The system has high denitrification rate, but has poor dephosphorization effect, and also has the problems of high effluent hardness and overhigh sulfate. The smaller the particle size of the sulfur and the limestone in the system, the larger the specific surface area and the higher the denitrification rate, the small particle size system is easy to block, and a simple substance system can not run due to breakdown. Moreover, due to the density difference between limestone and sulfur, the limestone and sulfur are layered during back washing, and the treatment effect is influenced. And the method of heating, melting sulfur, mixing with limestone, and pulverizing has the advantages of low specific surface area, smooth surface, and no influence on the inhabitation and propagation of microorganisms.
The biological filter filling mainly has the functions of accommodating attached microorganisms, is a carrier for the growth of the microorganisms, provides a stable environment for the microorganisms to inhabit, grow and propagate, is rich in porous structure and suitable pore size, increases the specific surface area of the biological filter filling, and provides a larger place and a suitable environment for the growth and propagation of the microorganisms. Meanwhile, the irregular surface of the filler has a forced turbulent action on water flow, so that the direction of the water flow is changed, and the stirring effect is achieved, thereby improving the nitrogen and phosphorus removal efficiency. Therefore, the development of the filler suitable for the pore size distribution is very important in the sewage treatment process.
At present, the problems that the conventional fillers such as sulfur, pyrite, limestone and the like used in the sulfur autotrophic denitrification technology have large particle size, small specific surface area, low denitrification rate and easy blockage of a system with small particle size are solved.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art and provide a foaming lightweight filler for synchronously removing nitrogen and phosphorus and a preparation method thereof. The light filler for synchronously denitrifying and dephosphorizing has the advantages of high porosity, large specific surface area, light weight, high reaction activity and the like, and the pore diameter is suitable for the inhabitation and propagation of microorganisms. Meanwhile, pyrite and aluminum sulfate are added into the filler, and aluminum sulfate and ferric sulfate are generated after reaction, so that the phosphorus removal effect is good. The invention also obtains the light filler by mixing, melting, granulating and other processes of sulfur powder, pyrite powder, limestone, a foaming agent, a foam stabilizer and the like.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme.
The invention provides a synchronous nitrogen and phosphorus removal foaming light filler which comprises the following components in percentage by weight: 40-70% of sulfur powder, 10-30% of pyrite powder, 1-10% of limestone, 0.1-5% of foaming agent and 0.1-5% of foam stabilizer.
Preferably, the particle size of the filler is 0.5-1.2 cm.
Preferably, the foaming agent comprises the following components in percentage by weight: 35-45% of sodium bicarbonate and 55-65% of aluminum sulfate octadecahydrate.
Preferably, the foam stabilizer comprises calcium stearate or polyvinyl alcohol.
Preferably, the particle sizes of the sulfur powder, the pyrite powder and the limestone are less than or equal to 0.3 mm.
The purpose of the invention and the technical problem to be solved are also realized by adopting the following technical scheme.
The invention also provides a preparation method of the foaming light filler for synchronously removing nitrogen and phosphorus, which comprises the following steps:
1) uniformly mixing sulfur powder, pyrite powder and limestone according to a ratio, heating to a certain temperature, stirring and melting to obtain a melt;
2) and adding a foaming agent and a foam stabilizer into the melt, stirring, foaming and granulating to obtain the foaming lightweight filler for synchronously removing nitrogen and phosphorus.
Preferably, the melting temperature in the step 1) is 130-180 ℃.
Preferably, the stirring conditions in step 2) are: the rotating speed is 60-120 r/min, and the time is 30-60 min.
Preferably, the granulation mode in the step 2) comprises steel belt granulation, roller granulation, wet granulation and crushing after solidification.
By the technical scheme, the invention at least has the following advantages:
1. the synchronous nitrogen and phosphorus removal foaming light filler has large specific surface area and rough surface, and the specific surface area is 260m2More than g, density of 1.6-2.8g/cm3The pore size distribution is mostly mesoporous. Provides a suitable surface and sufficient space for the attachment of microorganisms. Meanwhile, the filler can also influence the water flow, so that the wastewater is fully contacted with the filler, and the denitrification efficiency is improved.
2. The pyrite and the aluminum sulfate are added into the foaming lightweight filler for simultaneous nitrogen and phosphorus removal, so that the denitrifying bacteria form sulfur autotrophic denitrification by taking sulfur as an electron donor, the adding amount of an organic carbon source is reduced, and the wastewater treatment cost is reduced.
3. The aluminum hydroxide generated by decomposition of the foaming agent and the added limestone in the synchronous nitrogen and phosphorus removal foaming lightweight filler can neutralize acid generated by sulfur autotrophic denitrification and maintain acid-base balance in water.
4. Aluminum sulfate and ferric sulfate generated in the preparation process of the synchronous nitrogen and phosphorus removal foaming light filler can be used as flocculating agents to play a role in synchronous phosphorus removal.
5. The synchronous nitrogen and phosphorus removal foaming light filler is foamed by stirring in the preparation process, so that not only can mineral powder be prevented from settling, but also the complete foaming and the stable foam can be ensured.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Uniformly mixing sulfur powder, pyrite powder and limestone powder with the particle size of less than or equal to 0.3mm according to the mass ratio of 6.5:3:0.5, heating to 160 ℃, stirring and melting under heat preservation, adding a foaming agent (sodium bicarbonate: aluminum sulfate octadecahydrate: 43:57) and 1% of a foam stabilizer (calcium stearate) which are 5% of the total mass of the materials, stirring and foaming under heat preservation for 30 minutes, and stirring at the rotating speed of 120 revolutions per minute. And granulating or cooling and then crushing the mixture into particles with the average particle size of 0.8cm to obtain the foaming light filler for synchronously removing nitrogen and phosphorus. Specific surface area of physical adsorption test filler 265m2G, density of filler 1.83g/cm3。
Example 2
Uniformly mixing sulfur powder, pyrite powder and limestone powder with the particle size of less than or equal to 0.3mm according to the mass ratio of 6.5:3:0.5, heating to 160 ℃, stirring and melting under heat preservation, adding a foaming agent (sodium bicarbonate: aluminum sulfate octadecahydrate: 43:57) and 1% of a foam stabilizer (calcium stearate) which are 5% of the total mass of the materials, stirring and foaming under heat preservation for 60 minutes, and stirring at the rotating speed of 120 r/min. And granulating or cooling and then crushing the mixture into particles with the average particle size of 0.8cm to obtain the foaming light filler for synchronously removing nitrogen and phosphorus. Specific surface area of filler for physical adsorption test of 280m2(ii)/g, bulk density of filler 1.76g/cm3。
Example 3
Uniformly mixing sulfur powder, pyrite powder and limestone powder according to the mass ratio of 6.5:3:0.5, heating to 160 ℃, stirring and melting, adding a foaming agent (sodium bicarbonate: aluminum sulfate octadecahydrate: 43:57) accounting for 3% of the total mass of the materials and 1% of a foam stabilizer (calcium stearate), keeping the temperature and stirring for 30 minutes at the stirring speed of 100 revolutions per minute. And granulating or cooling and then crushing the mixture into particles with the average particle size of 0.8cm to obtain the foaming light filler for synchronously removing nitrogen and phosphorus. Specific surface area of physical adsorption test filler 186m2(ii)/g, bulk density of filler 2.61g/cm3。
Comparative example 1
Uniformly mixing sulfur powder, pyrite powder, limestone powder and sodium bicarbonate according to the mass ratio of 6.5:3:0.5:0.05, heating to 160 ℃, and stirring to melt. And granulating or cooling and then crushing the mixture into particles with the average particle size of 0.8cm to obtain the foaming light filler for synchronously removing nitrogen and phosphorus. Specific surface area 162m of physical adsorption test filler2(g), bulk density of filler 2.21g/cm3。
Evaluation of Nitrogen and phosphorus removal Effect of test example fillers
50g of the crushed fillers prepared in the above examples and comparative examples are respectively taken, the fillers are put into a fixed bed reactor, anaerobic sludge is inoculated and culture solution is added, the membrane formation is completed after 7 days of culture, the reactor is started, and the test time is 7 days. Continuously introducing water with the prepared nitrate nitrogen concentration of 40mg/L and phosphate state phosphorus of 0.9mg/L into the reactor, wherein the water retention time is 3h and the flow rate is 100 mL/min. Samples were taken every 8 hours to measure the nitrate nitrogen and phosphate phosphorus of each effluent, and the average removal rate of the corresponding nitrate nitrogen and phosphate phosphorus was calculated, and the results are shown in table 1.
TABLE 1 denitrification and dephosphorization Effect of each filler
As can be seen from the results in Table 1, the nitrogen and phosphorus removal effect of the synchronously nitrogen and phosphorus removing foamed lightweight filler of the present invention is significantly improved compared with that of comparative example 1.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The synchronous nitrogen and phosphorus removal foaming light filler is characterized by comprising the following components in percentage by weight: 40-70% of sulfur powder, 10-30% of pyrite powder, 1-10% of limestone, 0.1-5% of foaming agent and 0.1-5% of foam stabilizer.
2. The synchronous nitrogen and phosphorus removal foamed light filler according to claim 1, wherein the particle size of the filler is 0.5-1.2 cm.
3. The synchronous nitrogen and phosphorus removal foaming lightweight filler according to claim 1, wherein the foaming agent comprises the following components in percentage by weight: 35-45% of sodium bicarbonate and 55-65% of aluminum sulfate octadecahydrate.
4. The foaming lightweight filler for simultaneous phosphorus and nitrogen removal as claimed in claim 1, wherein the foam stabilizer comprises calcium stearate or polyvinyl alcohol.
5. The synchronous nitrogen and phosphorus removal foaming lightweight filler according to claim 1, wherein the particle size of the sulfur powder, the pyrite powder and the limestone is less than or equal to 0.3 mm.
6. A preparation method of a foaming light filler for simultaneous nitrogen and phosphorus removal is characterized by comprising the following steps:
1) uniformly mixing sulfur powder, pyrite powder and limestone according to a ratio, heating to a certain temperature, stirring and melting to obtain a melt;
2) and adding a foaming agent and a foam stabilizer into the melt, stirring, foaming and granulating to obtain the foaming lightweight filler for synchronously removing nitrogen and phosphorus.
7. The method according to claim 6, wherein the melting temperature in the step 1) is 130 to 180 ℃.
8. The method according to claim 6, wherein the stirring conditions in step 2) are: the rotating speed is 60-120 r/min, and the time is 30-60 min.
9. The method according to claim 6, wherein the granulation in step 2) comprises steel belt granulation, roller granulation, wet granulation, and crushing after solidification.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114524511A (en) * | 2022-01-28 | 2022-05-24 | 大连理工大学 | Alkalinity slow-release porous spherical shell suspended filler based on sulfur autotrophic nitrogen removal of low C/N sewage |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114524511A (en) * | 2022-01-28 | 2022-05-24 | 大连理工大学 | Alkalinity slow-release porous spherical shell suspended filler based on sulfur autotrophic nitrogen removal of low C/N sewage |
| CN114890542A (en) * | 2022-05-31 | 2022-08-12 | 桂林理工大学 | Double-iron-based composite mineral source autotrophic denitrification material and preparation method thereof |
| CN115417500A (en) * | 2022-09-29 | 2022-12-02 | 江西零真生态环境集团有限公司 | Sulfur autotrophic denitrification filler and preparation method thereof |
| CN117185720A (en) * | 2023-08-29 | 2023-12-08 | 深圳市碧园环保技术有限公司 | Method for large-scale production of denitrification and dephosphorization BY-PSAD-I type pyrite constructed wetland filler |
| CN117185720B (en) * | 2023-08-29 | 2024-05-03 | 深圳市碧园环保技术有限公司 | Method for large-scale production of denitrification and dephosphorization BY-PSAD-I type pyrite constructed wetland filler |
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Application publication date: 20211203 |