CN118304855B - Environment-friendly efficient dephosphorizing agent for sewage treatment and preparation method thereof - Google Patents
Environment-friendly efficient dephosphorizing agent for sewage treatment and preparation method thereof Download PDFInfo
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- CN118304855B CN118304855B CN202410722685.4A CN202410722685A CN118304855B CN 118304855 B CN118304855 B CN 118304855B CN 202410722685 A CN202410722685 A CN 202410722685A CN 118304855 B CN118304855 B CN 118304855B
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- 239000010865 sewage Substances 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 150000002603 lanthanum Chemical class 0.000 claims abstract description 73
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 73
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 72
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 71
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000010457 zeolite Substances 0.000 claims abstract description 56
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims abstract description 49
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 35
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 33
- 150000000703 Cerium Chemical class 0.000 claims abstract description 30
- 159000000003 magnesium salts Chemical class 0.000 claims abstract description 28
- 238000001354 calcination Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 18
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000011574 phosphorus Substances 0.000 claims abstract description 14
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims description 88
- 239000002244 precipitate Substances 0.000 claims description 72
- 239000012266 salt solution Substances 0.000 claims description 68
- 230000032683 aging Effects 0.000 claims description 44
- 238000001035 drying Methods 0.000 claims description 44
- 238000005406 washing Methods 0.000 claims description 44
- 239000007788 liquid Substances 0.000 claims description 43
- 239000006185 dispersion Substances 0.000 claims description 26
- 239000003513 alkali Substances 0.000 claims description 25
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 24
- 239000007787 solid Substances 0.000 claims description 24
- 239000008367 deionised water Substances 0.000 claims description 22
- 229910021641 deionized water Inorganic materials 0.000 claims description 22
- 238000000227 grinding Methods 0.000 claims description 22
- 229920002565 Polyethylene Glycol 400 Polymers 0.000 claims description 20
- JLFNLZLINWHATN-UHFFFAOYSA-N pentaethylene glycol Chemical compound OCCOCCOCCOCCOCCO JLFNLZLINWHATN-UHFFFAOYSA-N 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- JLDSOYXADOWAKB-UHFFFAOYSA-N aluminium nitrate Chemical compound [Al+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O JLDSOYXADOWAKB-UHFFFAOYSA-N 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 229910002339 La(NO3)3 Inorganic materials 0.000 claims description 3
- 229920002582 Polyethylene Glycol 600 Polymers 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium nitrate Inorganic materials [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 3
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Inorganic materials [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 2
- 229910052684 Cerium Inorganic materials 0.000 abstract description 15
- 238000001179 sorption measurement Methods 0.000 abstract description 15
- 229910052751 metal Inorganic materials 0.000 abstract description 13
- 239000002184 metal Substances 0.000 abstract description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 10
- 239000002245 particle Substances 0.000 abstract description 10
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 abstract description 5
- 238000001556 precipitation Methods 0.000 abstract description 5
- 150000001875 compounds Chemical class 0.000 abstract description 4
- 239000002270 dispersing agent Substances 0.000 abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 abstract description 3
- 239000011777 magnesium Substances 0.000 abstract description 3
- 238000007654 immersion Methods 0.000 abstract description 2
- 239000003607 modifier Substances 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 239000013049 sediment Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 15
- 229910052747 lanthanoid Inorganic materials 0.000 description 6
- 150000002602 lanthanoids Chemical class 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000012851 eutrophication Methods 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- -1 lanthanide metals Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 150000002681 magnesium compounds Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/165—Natural alumino-silicates, e.g. zeolites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0207—Compounds of Sc, Y or Lanthanides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Removal Of Specific Substances (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses an environment-friendly efficient dephosphorizing agent for sewage treatment and a preparation method thereof, and belongs to the technical field of water treatment. The invention takes lanthanum salt, cerium salt, aluminum salt, magnesium salt and other multi-metal salts as a mixed metal modifier, polyethylene glycol as a dispersing agent, and modifies natural zeolite through a coprecipitation-calcination process, thus preparing the environment-friendly high-efficiency dephosphorizing agent. The addition of lanthanum and cerium leads the sediment to form a porous loose structure, which is beneficial to the immersion of the phosphorus-containing sewage; the elements aluminum and magnesium can improve the dispersibility of rare earth elements, reduce the enrichment of negative charges on the surface of the dephosphorizing agent, and improve the electrostatic adsorption capacity on phosphorus-containing compounds in sewage. The polyethylene glycol can promote the formation of precipitation particles, increase the surface area of the dephosphorization agent and improve the adsorption capacity of the dephosphorization agent. The preparation method has the advantages of short flow, simple process and low cost, and has higher application and popularization values.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to an environment-friendly efficient dephosphorizing agent for sewage treatment and a preparation method thereof.
Background
In recent years, with the rapid development of economy and industry and agriculture, a series of environmental problems have been generated, in which eutrophication of water bodies is one of the environmental problems that is serious and is of worldwide concern. The root cause of eutrophication is the presence in the body of water of elements necessary for the growth of a large number of organisms, such as the P element. The eutrophication of the water body can cause serious harm to the environment, a large amount of algae float on the water body, the transmittance and the oxygen content of the water are reduced while the water body landscape is influenced, the water quality is seriously influenced, the water production cost is increased, and the existence of aquatic organisms is directly endangered.
Various methods have been developed in recent years for removing excess phosphorus from water bodies, including biological, physical, chemical, and adsorption methods. Among them, the adsorption method is widely used because of its convenience in use, low energy consumption, high efficiency and rapid removal rate. The adsorption method mainly uses solid adsorption materials with high specific surface area and multiple pores, and substances such as nitrogen, phosphorus and the like in the sewage are adsorbed on the surfaces of the materials through electrostatic actions, complexation reactions, surface adsorption and the like. The zeolite has more pore channels with uniform size and holes with large specific surface area, has the characteristics of nature, no pollution, low price, easy acquisition and the like, is an aluminosilicate mineral with excellent adsorption ion exchange performance, and is widely used in water treatment.
But the pure zeolite has a low adsorption capacity. In the prior art, mixed metal modified zeolite such as lanthanide metal, lanthanide binary metal, lanthanide ternary metal and the like is adopted, but the lanthanide composite oxide prepared by the prior art has low crystallinity, small specific surface area, poor combination among metal oxides and limited dephosphorization efficiency.
Disclosure of Invention
Aiming at the technical problems, the invention provides an environment-friendly efficient dephosphorizing agent for sewage treatment and a preparation method thereof, comprising the following steps:
the preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 2-4:2-3:1-2:0.3-1.5; the mass ratio of lanthanum atoms in polyethylene glycol and lanthanum salt is (0.05-0.4): 1, a step of;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of lanthanum atoms in the natural zeolite to lanthanum salt is 10-16:1;
(3) Adjusting the pH of the dispersion liquid to 8-10 with alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate;
(4) Calcining the precipitate at 300-500 ℃ for 1-4h, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
The prior art generally employs lanthanum salts to precipitate on the surface of porous solid adsorbent materials to produce the adsorbent materials. However, the precipitate formed by the simple lanthanum salt is not uniformly dispersed, the particle size is larger, the specific surface area is smaller, and the adsorption capacity is not improved. The ionic radius and alkalinity of the rare earth element are gradually reduced from La to Ce, and the lanthanum element has higher activity than cerium element. La and Ce are common rare earth modified elements in the dephosphorization field, and the invention combines La and Ce rare earth elements and aluminum and magnesium metal oxides to improve the crystallization capability and the surface area of the compound. Wherein, the addition of cerium element belonging to rare earth substances can disperse the precipitation process of lanthanum element, so that the precipitation forms a porous loose structure, which is beneficial to the immersion and adsorption of phosphorus-containing sewage. And because La and Ce are different in alkalinity and ionic radius, the dynamic characteristics of phosphorus adsorption are also different, and the addition of the La and Ce can play a complementary role. However, the addition of Ce can easily cause the surface of the lanthanide phosphorus remover to be enriched with negative charges, and electrostatic repulsion is shown on phosphate ions, which is unfavorable for adsorption, and on the other hand, lanthanide metals are easy to be deposited on the surface of zeolite. In order to solve the problems, aluminum atoms and a small amount of neutral element magnesium with weak adsorption capacity are introduced, so that the isoelectric point of the dephosphorizing agent is improved, and the enrichment of negative charges is reduced. The aluminum atoms are similar to the main components of zeolite, can help the rare earth elements to precipitate on the surface of zeolite, and the magnesium atoms can help to improve the dispersing capability.
In order to further improve the dispersibility of the multi-metal coprecipitated particles, particle agglomeration is prevented. The invention introduces a surfactant. PEG not only promotes the formation of precipitated particles; but also plays a role of dispersing agent, promotes the uniform dispersion of the precipitate on the surface of zeolite, and prevents the overlarge particle size of particles from agglomerating on the surface of zeolite.
The lanthanum salt, cerium salt, aluminum salt and magnesium salt are La（NO3）3•6H2O,Ce（NO3）3•6H2O、Al（NO3）3•9H2O 、Mg（NO3）2•6H2O; polyethylene glycol which is PEG400 or PEG600 respectively. The mass of lanthanum atoms in lanthanum salts is herein the mass of lanthanum atoms in La (NO 3）3•6H2 O mass) used.
The stirring time in the step (2) is 0.5-1h.
The alkali liquor in the step (3) is any one of ammonia water, sodium hydroxide solution and potassium hydroxide solution.
And (3) continuing stirring for 2-4h.
Aging in the step (3) is performed for 12-24 hours at room temperature.
The washing in the step (3) is carried out for 3-5 times by adopting deionized water.
And (3) drying at 90-120 ℃ for 2-4h.
Further, in the step (1), the molar ratio of La, ce, al, mg ions in the salt solution is 2-4:2-3:1-2:0.5-1; the mass ratio of lanthanum atoms in polyethylene glycol and lanthanum salt is (0.1-0.2): 1.
The invention has the beneficial effects that:
the invention takes lanthanum salt, cerium salt, aluminum salt and magnesium salt as composite metal elements, polyethylene glycol as surfactant, and prepares the multi-element metal modified zeolite through coprecipitation-calcination process. La and Ce rare earth elements are compounded and combined with aluminum and magnesium metal oxides, so that the crystallization capacity and the surface area of the compound are improved. La and Ce have different alkalinity and ionic radius, and the addition of the La and Ce can play a complementary role. Meanwhile, the addition of the elements aluminum and magnesium reduces the enrichment of negative charges and improves the dispersibility of the mixed oxide. In addition, the polyethylene glycol can promote the formation of precipitation particles, further increase the surface area of the zeolite dephosphorization agent and improve the adsorption capacity of the zeolite dephosphorization agent.
Detailed Description
The following describes specific embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention. The raw materials in the examples are all commercially available, and the types of the raw materials in the examples are consistent unless otherwise specified.
Wherein, lanthanum salt, cerium salt, aluminum salt and magnesium salt in the examples and the comparative examples are La（NO3）3•6H2O,Ce（NO3）3•6H2O、Al（NO3）3•9H2O 、Mg（NO3）2•6H2O; alkali solutions respectively and are ammonia water.
Example 1
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 2:2:1:0.5; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.1:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of lanthanum atoms in the natural zeolite to lanthanum salt is 10:1; stirring time is 0.5h;
(3) Adjusting the pH of the dispersion liquid to 8 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 2 hours; aging for 12 hours at room temperature; the washing is carried out for 3 times by adopting deionized water; drying at 90deg.C for 4 hr;
(4) Calcining the precipitate for 4 hours at 300 ℃ and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Example 2
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 4:3:2:1, a step of; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.2:1, a step of; the polyethylene glycol is PEG600;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of lanthanum atoms in the natural zeolite to lanthanum salt is 16:1; stirring for 1h;
(3) Adjusting the pH of the dispersion liquid to 10 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 4 hours; aging for 24 hours at room temperature; the washing is carried out for 5 times by adopting deionized water; drying at 120deg.C for 2 hr;
(4) Calcining the precipitate at 500 ℃ for 1h, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Example 3
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 2:3:1:0.5; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.1:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of lanthanum atoms in the natural zeolite to lanthanum salt is 12:1; stirring time is 0.6h;
(3) Adjusting the pH of the dispersion liquid to 8.5 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 2.6h; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 100deg.C for 3.2 hr;
(4) Calcining the precipitate for 2 hours at 360 ℃ and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Example 4
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 4:2:2:1, a step of; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.12:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of lanthanum atoms in the natural zeolite to lanthanum salt is 14:1; stirring time is 0.9h;
(3) Adjusting the pH of the dispersion liquid to 9.5 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.5h; aging for 18 hours at room temperature; the washing is carried out for 5 times by adopting deionized water; drying at 110deg.C for 2.5 hr;
(4) Calcining the precipitate for 2.4 hours at 440 ℃, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Example 5
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 3:2.5:1.5:0.7; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.15:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 13:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Example 6
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 2.4:2.8:1.2:0.6; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.12:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of lanthanum atoms in the natural zeolite to lanthanum salt is 14:1; stirring time is 0.8h;
(3) Adjusting the pH of the dispersion to 8.6 with alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 2.7h; aging for 20 hours at room temperature; the washing is carried out for 5 times by adopting deionized water; drying at 97deg.C for 4 hr;
(4) Calcining the precipitate for 3.5h at 330 ℃ and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Example 7
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 3.4:2.2:1.8:0.7; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.18:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 15:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 4 hours; aging for 16h at room temperature; the washing is carried out for 5 times by adopting deionized water; drying at 100deg.C for 3 hr;
(4) Calcining the precipitate for 2 hours at 410 ℃ and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Example 8
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 3:2.5:1.5:0.3; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.15:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 13:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Example 9
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 3:2.5:1.5:1.5; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.15:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 13:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Example 10
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 3:2.5:1.5:0.7; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.05:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 13:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Example 11
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 3:2.5:1.5:0.7; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.4:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 13:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Comparative example 1
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the mole ratio of La, al and Mg ions in the salt solution is 5.5:1.5:0.7; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.08:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of lanthanum atoms in the natural zeolite to lanthanum salt is 7:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Comparative example 2
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Cerium salt, aluminum salt, magnesium salt and polyethylene glycol are dispersed in water to obtain a salt solution, wherein the molar ratio of Ce, al and Mg ions in the salt solution is 5.5:1.5:0.7; the mass ratio of cerium metal element in polyethylene glycol and cerium salt is 0.08:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to the cerium metal element in the cerium salt is 7:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Comparative example 3
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 3:1:1.5:0.7; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.15:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 13:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Comparative example 4
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 3:5:1.5:0.7; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.15:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 13:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Comparative example 5
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt and polyethylene glycol in water to obtain a salt solution, wherein the mole ratio of La, ce and Al ions in the salt solution is 3:2.5:2.2; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.15:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 13:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Comparative example 6
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the mole ratio of La, ce and Mg ions in the salt solution is 3:2.5:2.2; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.15:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 13:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Comparative example 7
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 3:2.5:0.5:0.7; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.15:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 13:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Comparative example 8
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 3:2.5:3:0.7; the mass ratio of lanthanum atoms in polyethylene glycol to lanthanum salt is 0.15:1, a step of; the polyethylene glycol is PEG400;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 13:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Comparative example 9
The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment comprises the following steps:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt and magnesium salt in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 3:2.5:1.5:0.7;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of the natural zeolite to lanthanum atoms in lanthanum salt is 13:1; stirring time is 0.7h;
(3) Adjusting the pH of the dispersion liquid to 9 by alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate; continuing stirring for 3.3 hours; aging for 16h at room temperature; the washing is to adopt deionized water for 4 times; drying at 95deg.C for 4 hr;
(4) Calcining the precipitate at 400 ℃ for 2 hours, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
Performance test:
1. the specific surface areas of the phosphorus removers prepared in examples and comparative examples were measured using a specific surface area analyzer.
2. Preparing 2mg/L of simulated phosphate sewage, adding the phosphorus removing agent prepared in the examples and the comparative examples according to the proportion of 2g/L, reacting for 5 hours, measuring the content of phosphate in the solution, and calculating the phosphate removal rate.
TABLE 1 Environment-friendly efficient dephosphorizing agent Performance for Sewage treatment prepared in examples 1-11
Table 1, below
Table 2 Performance of Environment-friendly efficient dephosphorizing agent for wastewater treatment prepared in comparative examples 1 to 9
As can be seen from examples 1-9, the multi-metal modified zeolite dephosphorizing agent prepared by the invention has large specific surface area and high dephosphorizing efficiency. When the method is remarkable, the removal rate of magnesium atoms to phosphorus is low, the addition amount of the magnesium atoms cannot be excessively high, otherwise, the magnesium atoms are easy to form an outer coating, and the phosphorus removal efficiency is affected. In particular, as can be seen from examples 5 and examples 8-11, the molar ratio of La, ce, al, mg ions is from 2 to 4:2-3:1-2:0.5-1; the mass ratio of lanthanum atoms in polyethylene glycol and lanthanum salt is (0.1-0.2): 1, the dephosphorization efficiency is higher; this may be related to clogging of zeolite pore size by precipitation when polyethylene glycol is too much. As can be seen from comparative examples 1-8, la and Ce rare earth elements are compounded and combined with aluminum and magnesium metal oxides, the crystallization capacity and the surface area of the compound can be greatly improved, the leaching of phosphorus-containing sewage is facilitated, and the phosphorus removal efficiency is improved. The addition of both La and Ce may play a complementary role. Meanwhile, the aluminum and magnesium compound not only contributes to the uniform dispersion of rare earth precipitates, but also helps to improve the isoelectric point of the dephosphorizing agent and reduce the enrichment of negative charges. The addition of cerium salt, aluminum salt and magnesium salt can promote the formation of a loose porous structure of the precipitate and promote the dispersion of the precipitate; however, when cerium salt, aluminum salt and magnesium salt are excessively added, the crystal structure may be damaged, and the crystal is abnormally grown, which is unfavorable for improving the dephosphorization efficiency. It can be seen from comparative example 9 that polyethylene glycol not only promotes the formation of precipitated particles; and the dispersing agent can play a role of dispersing agent, promote uniform dispersion of the precipitate on the surface of zeolite, prevent overlarge particle size and improve the specific surface area and the dephosphorization efficiency of the dephosphorization agent.
Claims (10)
1. The preparation method of the environment-friendly efficient dephosphorizing agent for sewage treatment is characterized by comprising the following steps of:
(1) Dispersing lanthanum salt, cerium salt, aluminum salt, magnesium salt and polyethylene glycol in water to obtain a salt solution, wherein the molar ratio of La, ce, al, mg ions in the salt solution is 2-4:2-3:1-2:0.3-1.5; the mass ratio of lanthanum atoms in polyethylene glycol and lanthanum salt is (0.05-0.4): 1, a step of;
(2) Adding natural zeolite into salt solution, stirring uniformly, and dispersing; the mass ratio of lanthanum atoms in the natural zeolite to lanthanum salt is 10-16:1;
(3) Adjusting the pH of the dispersion liquid to 8-10 with alkali liquor, and continuously stirring; aging, separating solid from liquid, collecting precipitate, washing, and drying to obtain precipitate;
(4) Calcining the precipitate at 300-500 ℃ for 1-4h, and grinding to obtain the environment-friendly high-efficiency dephosphorizing agent for sewage treatment.
2. The method for preparing the environment-friendly and efficient dephosphorizing agent for sewage treatment according to claim 1, wherein the lanthanum salt, the cerium salt, the aluminum salt and the magnesium salt are La（NO3）3•6H2O,Ce（NO3）3•6H2O、Al（NO3）3•9H2O 、Mg（NO3）2•6H2O; polyethylene glycol which is PEG400 or PEG600 respectively.
3. The method for preparing an environment-friendly and efficient dephosphorizing agent for sewage treatment according to claim 1, wherein the stirring time in the step (2) is 0.5-1h.
4. The method for preparing the environment-friendly and efficient dephosphorizing agent for sewage treatment according to claim 1, wherein the alkali liquor in the step (3) is any one of ammonia water, sodium hydroxide solution and potassium hydroxide solution.
5. The method for preparing an environment-friendly and efficient dephosphorizing agent for sewage treatment according to claim 1, wherein the continuous stirring time in the step (3) is 2-4h.
6. The method for preparing the environment-friendly and efficient dephosphorizing agent for sewage treatment according to claim 1, wherein the aging in the step (3) is carried out for 12-24 hours under the room temperature condition.
7. The method for preparing the environment-friendly and efficient dephosphorizing agent for sewage treatment according to claim 1, wherein the washing in the step (3) is carried out 3-5 times by adopting deionized water.
8. The method for preparing the environment-friendly and efficient dephosphorizing agent for sewage treatment according to claim 1, wherein the drying in the step (3) is carried out for 2-4 hours at the temperature of 90-120 ℃.
9. The method for preparing the environment-friendly and efficient dephosphorizing agent for sewage treatment according to claim 1, wherein the molar ratio of La, ce, al, mg ions in the salt solution in the step (1) is 2-4:2-3:1-2:0.5-1; the mass ratio of lanthanum atoms in polyethylene glycol and lanthanum salt is (0.1-0.2): 1.
10. An environment-friendly efficient dephosphorizing agent for sewage treatment, which is characterized in that: the method for preparing the environment-friendly and efficient phosphorus removal agent for sewage treatment according to any one of claims 1 to 9.
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