CN107162139B - Flocculant for synchronously removing ammonia nitrogen and phosphorus and preparation method and application thereof - Google Patents
Flocculant for synchronously removing ammonia nitrogen and phosphorus and preparation method and application thereof Download PDFInfo
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- CN107162139B CN107162139B CN201710407512.3A CN201710407512A CN107162139B CN 107162139 B CN107162139 B CN 107162139B CN 201710407512 A CN201710407512 A CN 201710407512A CN 107162139 B CN107162139 B CN 107162139B
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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Abstract
The invention discloses a flocculant for synchronously removing ammonia nitrogen and phosphorus, a preparation method and application thereof, wherein the flocculant comprises a liquid inorganic aluminum flocculant and [ AlO ]4Al12(OH)24(H2O)12]7+Pillared zeolite prepared by pillaring zeolite as a pillaring agent, wherein the pillared zeolite is further loaded with Mg2+The flocculant can deeply remove ammonia nitrogen and phosphorus in wastewater when the concentration of the ammonia nitrogen and the total phosphorus is lower.
Description
Technical Field
The invention relates to the field of water treatment, in particular to a flocculant for synchronously removing ammonia nitrogen and phosphorus, a preparation method and application thereof.
Background
Along with the frequent occurrence of surface water bloom pollution events in China in recent years, water eutrophication becomes an environmental problem of national and even national concern. Nitrogen and phosphorus are key factors causing water eutrophication, nitrogen and phosphorus emission is reduced, and comprehensive treatment of wastewater containing ammonia nitrogen and phosphorus is enhanced, so that the method is an important way for reducing water eutrophication of inland rivers, lakes and the like in China and guaranteeing the safety of drinking water sources.
In recent years, the emission standards of ammonia nitrogen and phosphorus are gradually improved. Taking the pollutant discharge Standard of urban wastewater treatment plants (GB18918-2002) as an example, the first-level A standard and the first-level B standard respectively stipulate that the ammonia nitrogen limit of effluent is 5mg/L and 8mg/L (the limit is 8mg/L and 15mg/L when the water temperature is lower than 12 ℃), and the total phosphorus limit is 0.5mg/L and 1.0 mg/L. However, the limit value is still far from the quality standard of surface water environment (GB3838-2002), the ammonia nitrogen limit value of the water quality standard of the class V water body is 2.0mg/L, and the total phosphorus limit value is 0.4mg/L (0.2 mg/L for lakes and reservoirs). Particularly, the effluent of the current urban sewage treatment plant is often used as the water supplement of surface water around cities and towns, and the eutrophication of the water body can be effectively prevented and controlled only by further improving the discharge standards of ammonia nitrogen and phosphorus. Based on the above, a more strict local standard is established in some regions, for example, the local standard of Beijing city, namely the discharge standard of water pollutants for urban sewage treatment plants (DB11890-2012) stipulates that the ammonia nitrogen limit of effluent of new (modified and expanded) urban sewage treatment plants discharged into water bodies of II and III in Beijing city is 1.0mg/L (the limit is 1.5mg/L when the water temperature is lower than 12 ℃), and the total phosphorus limit is 0.2 mg/L. However, the ammonia nitrogen of the secondary biochemical effluent of the common urban sewage plant is 5-10mg/L, and the total phosphorus is 1.0 mg/L. Therefore, in order to meet the above standard, an advanced treatment process is required to realize the synchronous deep removal of ammonia nitrogen and phosphorus in water.
The chemical flocculation is widely applied to the processes of chemical industry, oil refining, medicine, food, materials, metallurgy, biochemistry, environmental protection and the like. In the current practical water pollution control technology, the application priority and universality of flocculation are incomparable with other technical units, and the flocculation is one of the most common treatment units in the current water treatment process flow, and the flocculation treatment method has the characteristics of simplicity and convenience in operation, stable treatment effect, easiness in construction, upgrading and reconstruction and the like. The phosphorus removal by the flocculation method is mainly realized by adding a certain amount of flocculant (metal salts containing iron, aluminum, calcium and the like) to react with phosphate in the wastewater to generate a compound which is insoluble in water, and then, the solid and the liquid are separated by precipitation to achieve the aim of removing the phosphorus from the wastewater. Ammonium ion (NH) in wastewater4 +) Generally do not form precipitates with anions, but react with certain ions to form water-insoluble double salts, e.g. ZnNH4PO4、NiNH4PO4、MnNH4PO4、MgNH4PO4The NH in water can be removed by forming these hardly soluble double salts4 +. However, since Zn, Ni, and Mn are heavy metal elements and easily exert adverse effects on the environment, a substance containing these heavy metal elements is not generally used as a precipitant. Mg has no toxicity, is an essential element for human bodies, has important effect on the growth and the propagation of animals, plants and microorganisms, and a proper amount of Mg is beneficial to the biochemical treatment of wastewater, so the Mg salt can be used as a precipitator. NH in wastewater4 +Will be mixed with PO4 3-、Mg2+React to generate insoluble waterDouble salt magnesium ammonium phosphate (MgNH)4PO4·6H2O), thereby achieving the purpose of simultaneously removing ammonia nitrogen and phosphorus from the wastewater.
Magnesium ammonium phosphate is also called struvite, so the method for synchronously removing ammonia nitrogen and phosphorus is called struvite precipitation. However, the struvite precipitation method has a good treatment effect only when treating high-concentration nitrogen and phosphorus wastewater, and cannot realize deep removal of ammonia nitrogen and phosphorus in wastewater when the concentrations of ammonia nitrogen and total phosphorus are low. At present, no flocculating agent capable of synchronously removing ammonia nitrogen and phosphorus at low concentration exists.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
One of the purposes of the invention is to provide a flocculant for synchronously removing ammonia nitrogen and phosphorus, so that ammonia nitrogen and phosphorus in wastewater can be deeply removed when the concentrations of ammonia nitrogen and total phosphorus are low.
The invention also aims to provide a preparation method of the flocculant for synchronously removing ammonia nitrogen and phosphorus, which can simultaneously remove ammonia nitrogen and phosphorus in wastewater at low concentration through reasonable operation steps.
The invention also aims to provide the application of the flocculant for synchronously removing ammonia nitrogen and phosphorus, so that the flocculant for synchronously removing ammonia nitrogen and phosphorus can be widely applied.
In order to achieve the aim, the invention provides a flocculant for synchronously removing ammonia nitrogen and phosphorus, which comprises a liquid inorganic aluminum flocculant and [ AlO ]4Al12(OH)24(H2O)12]7+Pillared zeolite prepared by pillaring zeolite as a pillaring agent, wherein Mg is also loaded on the pillared zeolite2+；
Wherein, due to [ AlO ]4Al12(OH)24(H2O)12]7+Has excellent stability, high charge and large molecular weightAnd nano-size is considered to be the predominant flocculation morphology in flocculants, hence [ AlO4Al12(OH)24(H2O)12]7+The method has attracted wide attention in the industrial technical fields of water treatment, chemical catalysis, nano composite materials and the like; on the other hand, the pillared material is a novel microporous/mesoporous solid material, and generally adopts inorganic cationic hydroxyl polymer with large volume as a pillaring agent, and the inorganic cationic hydroxyl polymer is converted into metal oxide through calcination to prop open the lamella of the carrier material, so that a two-dimensional pore network structure with molecular scale is formed between the lamellae. Currently used for the preparation of pillared materials are Al inorganic pillaring agents, which are predominantly aluminum hydroxy polymers, and the above mentioned [ AlO4Al12(OH)24(H2O)12]7+It is an aluminum hydroxyl polymer with good properties.
In another embodiment of the above flocculant for synchronously removing ammonia nitrogen and phosphorus, the mass ratio of the liquid inorganic aluminum flocculant to the pillared zeolite is 85-95: 5-15.
In another embodiment of the above flocculant for synchronously removing ammonia nitrogen and phosphorus, the pillared zeolite is loaded with Mg2+The weight percentage of the zeolite in the column support is 7-15%.
In another embodiment, the liquid inorganic aluminum flocculant is a liquid inorganic aluminum flocculant prepared from at least one of polyaluminium chloride, polyaluminium sulfate, aluminium chloride and aluminium sulfate, and the mass percentage of aluminium contained in the liquid inorganic aluminum flocculant is greater than or equal to 5%, and optionally, the liquid inorganic aluminum flocculant is commercially available, for example, polyaluminium chloride is available from environmental protection technologies ltd, beijing, and polyaluminium sulfate is available from natural cleaning materials ltd.
In another embodiment, the flocculant for synchronously removing ammonia nitrogen and phosphorus contains aluminum in an amount of more than or equal to 4% by mass.
In another embodiment of the above flocculant for simultaneous removal of ammonia nitrogen and phosphorus, the specific surface area of the pillared zeolite is 160.4 to 270.8m2(ii) a total pore volume of 0.146-0.175cm3/g。
The invention also provides a preparation method of the flocculant for synchronously removing ammonia nitrogen and phosphorus, which comprises the following steps: with [ AlO ]4Al12(OH)24(H2O)12]7+Pillaring zeolite as pillaring agent to obtain pillared zeolite, and loading the pillared zeolite with Mg2+Then adding the mixture into the liquid inorganic aluminum flocculant to be mixed and stirred to prepare a finished product;
optionally, the stirring speed is 150-.
In another embodiment, the flocculant for synchronously removing ammonia nitrogen and phosphorus or the preparation method of the flocculant for synchronously removing ammonia nitrogen and phosphorus is [ AlO4Al12(OH)24(H2O)12]7+The preparation method of the pillared zeolite serving as the pillaring agent comprises the following steps:
(1) preparing zeolite powder suspension and stirring the zeolite powder suspension,
optionally, deionized water is used to prepare zeolite powder suspension,
optionally, the mass percent of the zeolite powder in the zeolite powder suspension is 2-4%,
optionally, the zeolite powder is clinoptilolite powder, the purity of the clinoptilolite powder is more than or equal to 70 percent, the ammonia absorption value is more than or equal to 100mg/100g,
optionally, the stirring speed is 200-300 r/min;
(2) adding [ AlO ] into the zeolite powder suspension4Al12(OH)24(H2O)12]7+The solution is prepared into a mixed solution,
optionally, the [ AlO ]4Al12(OH)24(H2O)12]7+[ AlO ] in solution4Al12(OH)24(H2O)12]7+The mass percent is more than or equal to 90 percent, and optionally [ AlO ]4Al12(OH)24(H2O)12]7+The addition amount of the solution is 15-20mmol (calculated by Al)/g zeolite powder.
(3) Stirring, drying, grinding and roasting the mixed solution to obtain the [ AlO4Al12(OH)24(H2O)12]7+The zeolite is supported by the column, and the zeolite is supported by the column,
optionally, stirring for 4-6h at 55-60 ℃,
optionally, washing to Cl-free after stirring-，
Optionally, the drying temperature is 110-,
optionally, grinding and sieving with 100 mesh sieve,
optionally, the roasting temperature is 450-.
In another embodiment of the above method for preparing flocculant for synchronously removing ammonia nitrogen and phosphorus, the pillared zeolite is loaded with Mg2+The method of (1) is as follows
(1) Adding deionized water into the prepared pillared zeolite as a carrier, and impregnating Mg (NO)3)2Optionally, the dipping time is 10-12h,
(2) drying, roasting and grinding to obtain loaded Mg2+The pillared zeolite is optionally dried at the temperature of 110-.
The invention also provides application of the flocculant for synchronously removing ammonia nitrogen and phosphorus in domestic and industrial wastewater treatment.
The flocculant for synchronously removing ammonia nitrogen and phosphorus is suitable for treating wastewater with low-concentration ammonia nitrogen (<10mg/L) and total phosphorus (<5.0 mg/L).
Compared with the prior art, the invention has the following beneficial effects:
the invention synthesizes a novel Mg-loaded material2+[ AlO ] of4Al12(OH)24(H2O)12]7+Pillared zeolite is used for preparing a flocculant for synchronously removing ammonia nitrogen and phosphorus. When the flocculant is added into water, the adsorption effect of the pillared zeolite enables low-concentration ammonia nitrogen and phosphorus in the water to be gathered around the flocculant and gradually enter pores of the pillared zeolite. When the adsorbed ammonia nitrogen and phosphorus reach a certain concentration, the adsorbed ammonia nitrogen and phosphorus can react with Mg loaded on the pillared zeolite2+Reaction is carried out to generate magnesium ammonium phosphate (MgNH) in the pore channels4PO4·6H2O) to be fixed in the column-supported zeolite and at the same time, [ AlO ] of the column-supported zeolite4Al12(OH)24(H2O)12]7+Can be gradually released into water, thereby enhancing the flocculation of the aluminum flocculant, removing solid matter and particulate matters in the water through flocculation precipitation, and finally realizing the deep removal of low-concentration ammonia nitrogen and phosphorus.
When the flocculant for synchronously removing ammonia nitrogen and phosphorus is used for treating water or sewage containing ammonia nitrogen and phosphorus, the granularity and density of flocs are obviously increased, the sedimentation speed is accelerated, the ammonia nitrogen and phosphorus can be efficiently and synchronously removed, the phosphorus removal rate reaches over 90 percent, the ammonia nitrogen removal rate reaches over 70 percent, and particularly, when low-concentration ammonia nitrogen (<10mg/L) and total phosphorus (<5.0mg/L) are treated, the deep removal of nitrogen and phosphorus can be realized; the flocculant for synchronously removing ammonia nitrogen and phosphorus can be widely used for treatment of domestic water, domestic sewage, reclaimed water, ecological water and various industrial wastewater treatment processes such as papermaking, leather, chemical fiber, chemical fertilizer, electric power, food, printing and dyeing and the like.
Detailed Description
The following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.
Example 1:
(1) preparation of flocculant for synchronously removing ammonia nitrogen and phosphorus
(ii) membrane distillation (for reference: Guoyujie, Koanwang, Vannan. high concentration and high Al)13Preparation of a Polyaluminum chloride solution containing the amount [ J]Inorganic chemistry journal, 2007) preparation of [ AlO4Al12(OH)24(H2O)12]7+The solution acts as a pillaring agent. Wherein [ AlO ] is4Al12(OH)24(H2O)12]7+The mass percentage of (A) is 92.3 percent for standby.
② clinoptilolite powder is used as starting material, the purity is 75%, and the ammonia absorption value is 150mg/100 g. Preparing 150ml of zeolite suspension with the mass percent of 4% by deionized water, adding the zeolite suspension into a three-neck flask, quickly stirring (the stirring speed is 200r/min), and slowly adding 60ml of AlO4Al12(OH)24(H2O)12]7+The dropping speed of the pillaring liquid is controlled to be about 5ml/min, after the dropping is finished, the reaction kettle is continuously stirred for 4 hours at the temperature of 60 ℃, then, the filter cake is obtained by suction filtration, and the filter cake is washed for many times by using the method of combining deionized water with the suction filtration until the filtrate has no Cl-(detecting with silver nitrate), drying the filter cake in a 120 ℃ oven for 3h, grinding the dried zeolite and sieving with a 100-mesh sieve, and finally roasting the sample in a muffle furnace at 500 ℃ for 3h to obtain [ AlO ]4Al12(OH)24(H2O)12]7+A pillared zeolite.
(iii) AlO prepared by the above4Al12(OH)24(H2O)12]7+Adding deionized water to 100ml of water solution, and impregnating Mg (NO) by equivalent volume impregnation method3)2So that Mg is present2+The total loading amount is about 10 percent (mass percentage), after dipping and placing for 12 hours, drying for 5 hours in a 120 ℃ drying oven, finally roasting for 2 hours in a muffle furnace at 300-600 ℃, grinding and sieving with a 100-mesh sieve to finally obtain the loaded Mg2+[ AlO ] of4Al12(OH)24(H2O)12]7+A pillared zeolite.
Fourthly, the loaded Mg is taken2+[ AlO ] of4Al12(OH)24(H2O)12]7+5g of pillared zeolite was added to 95g of commercially available liquid polyaluminum chloride (aluminum oxide content: 10% or more) (available from environmental protection technologies, Inc., Yino, Beijing) and stirred for 2 hours. The stirring speed is 200r/min, and the flocculant capable of synchronously removing ammonia nitrogen and phosphorus is finally prepared, wherein the aluminum content is more than or equal to 4 percent, and the appearance is light yellow liquid.
(2) Effect test
The effluent of a certain reclaimed water plant is taken for test, the total phosphorus content is 0.47mg/L, and the ammonia nitrogen content is 1.34 mg/L. The flocculant for synchronously removing ammonia nitrogen and phosphorus is used for treatment, and the adding amount is 70 mg/L. Through determination, the total phosphorus of the effluent after coagulation treatment is 0.04mg/L, the ammonia nitrogen is 0.32mg/L, the total phosphorus removal rate is 91.5%, and the ammonia nitrogen removal rate is 76.1%, which reach the II-class standard limit value of surface water (the total phosphorus limit value is less than or equal to 0.1 (lake and reservoir 0.025), and the nitrogen phosphorus limit value is less than or equal to 0.5).
Example 2
(1) Preparation of flocculant for synchronously removing ammonia nitrogen and phosphorus
Mg Supports were prepared as described in example 12+[ AlO ] of4Al12(OH)24(H2O)12]7+Pillared zeolite prepared by taking the above-mentioned Mg-supported zeolite2+[ AlO ] of4Al12(OH)24(H2O)12]7+Adding 8g of pillared zeolite into 92g of commercially available liquid polyaluminium chloride (the aluminum oxide content is more than or equal to 10 percent) (purchased from Beijing Yinuo environmental protection technology Co., Ltd.), and continuously stirring for 2h at the stirring speed of 150r/min to finally prepare the flocculant capable of synchronously removing ammonia nitrogen and phosphorus, wherein the aluminum content is more than or equal to 4 percent.
(2) Effect test
The effluent of a certain domestic sewage plant is taken for test, and the total phosphorus content is 1.35mg/L, and the ammonia nitrogen content is 5.7 mg/L. The synchronous nitrogen and phosphorus removal flocculating agent is used for treatment, and the adding amount is 90 mg/L. Through determination, the total phosphorus of the effluent after coagulation treatment is 0.12mg/L, the ammonia nitrogen is 0.92mg/L, the total phosphorus removal rate is 91.1%, and the ammonia nitrogen removal rate is 83.9%, which reach the III-class standard limit value of surface water (the total phosphorus limit value is less than or equal to 0.2 (lake and reservoir 0.05), and the nitrogen phosphorus limit value is less than or equal to 1.0).
Example 3
(1) Preparation of flocculant for synchronously removing ammonia nitrogen and phosphorus
Mg Supports were prepared as in example 12+[ AlO ] of4Al12(OH)24(H2O)12]7+Pillared zeolite prepared by taking the above-mentioned Mg-supported zeolite2+[ AlO ] of4Al12(OH)24(H2O)12]7+Adding 15g of pillared zeolite into 85g of commercially available liquid polyaluminium chloride (the aluminum oxide content is more than or equal to 10 percent) (purchased from Beijing Yinuo environmental protection technology Co., Ltd.), and continuously stirring for 2h at the stirring speed of 200r/min to finally prepare the flocculant capable of synchronously removing ammonia nitrogen and phosphorus, wherein the aluminum content is more than or equal to 4 percent.
(2) Effect test
The effluent of biochemical treatment of certain industrial sewage is taken for test, and the total phosphorus content is 8.46mg/L, and the ammonia nitrogen content is 17.6 mg/L. The flocculant is used for treatment, and the dosage is 150 mg/L. Through determination, the total phosphorus of the treated effluent is 0.36mg/L, the ammonia nitrogen is 3.48mg/L, the total phosphorus removal rate is 95.7%, and the ammonia nitrogen removal rate is 80.2%, which all reach the first-level standard limit of the sewage comprehensive discharge standard (the total phosphorus limit is less than or equal to 0.5mg/L, and the ammonia nitrogen limit is less than or equal to 15 mg/L).
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (23)
1. The flocculant for synchronously removing ammonia nitrogen and phosphorus is characterized by comprising a liquid inorganic aluminum flocculant and [ AlO ]4Al12(OH)24(H2O)12]7+Pillared zeolite prepared by pillaring zeolite as a pillaring agent, wherein Mg is also loaded on the pillared zeolite2+；
The mass ratio of the liquid inorganic aluminum flocculant to the pillared zeolite is 85-95: 5-15;
mg supported on the pillared zeolite2+The weight percentage of the zeolite in the column support is 7-15%.
2. The flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 1, wherein the liquid inorganic aluminum flocculant comprises a liquid inorganic aluminum flocculant prepared from at least one of polyaluminum chloride, polyaluminum sulfate, aluminum chloride and aluminum sulfate, and aluminum contained in the liquid inorganic aluminum flocculant accounts for more than or equal to 5% by mass of the liquid inorganic aluminum flocculant.
3. The flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 1, wherein the mass percentage of aluminum contained in the flocculant for synchronously removing ammonia nitrogen and phosphorus is more than or equal to 4%.
4. The flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 1, characterized in that the specific surface area of the pillared zeolite is 160.4-270.8m2(ii) a total pore volume of 0.146-0.175cm3/g。
5. The preparation method of the flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 1, characterized by comprising the following steps: with [ AlO ]4Al12(OH)24(H2O)12]7+Pillaring zeolite as pillaring agent to obtain pillared zeolite, and loading the pillared zeolite with Mg2+And then adding the mixture into the liquid inorganic aluminum flocculant to be mixed and stirred to obtain a finished product.
6. The method for preparing a flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 5, characterized in that the stirring speed is 150-200r/min, and the stirring duration is 2-4 h.
7. The method for preparing flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 5, characterized in that [ AlO ] is used4Al12(OH)24(H2O)12]7+The preparation method of the pillared zeolite for pillaring the zeolite as the pillaring agent comprises the following steps:
(1) preparing zeolite powder suspension and stirring;
(2) adding [ AlO ] into the zeolite powder suspension4Al12(OH)24(H2O)12]7+Preparing a mixed solution from the solution;
(3) stirring, drying, grinding and roasting the mixed solution to obtain the [ AlO4Al12(OH)24(H2O)12]7+A pillared zeolite.
8. The method for preparing the flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 7, characterized in that in the step (1), deionized water is used for preparing zeolite powder suspension.
9. The method for preparing the flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 7, characterized in that in the step (1), the mass percent of zeolite powder in the zeolite powder suspension is 2-4%.
10. The preparation method of the flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 7, characterized in that in the step (1), the zeolite powder is clinoptilolite powder, the purity of the clinoptilolite powder is more than or equal to 70%, and the ammonia absorption value is more than or equal to 100mg/100 g.
11. The method for preparing a flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 7, wherein in the step (1), the stirring speed is 200-300 r/min.
12. The method for preparing flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 7, characterized in that in the step (2), [ AlO ] is4Al12(OH)24(H2O)12]7+[ AlO ] in solution4Al12(OH)24(H2O)12]7+The mass percentage is more than or equal to 90 percent.
13. The method for preparing flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 7, characterized in that in the step (2), [ AlO ] is4Al12(OH)24(H2O)12]7+The addition amount of the solution is 15-20mmol/g zeolite powder calculated by Al.
14. The method for preparing the flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 7, characterized in that in the step (3), the mixture is stirred for 4-6 hours at the temperature of 55-60 ℃.
15. The method for preparing flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 7, characterized in that in the step (3), the flocculant is stirred and washed until no Cl is generated-。
16. The method for preparing a flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 7, characterized in that in the step (3), the drying temperature is 110-120 ℃, and the drying time is more than 3 h.
17. The method for preparing the flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 7, characterized in that in the step (3), the flocculant is ground and sieved by a 100-mesh sieve.
18. The method for preparing a flocculant capable of synchronously removing ammonia nitrogen and phosphorus as claimed in claim 7, wherein in the step (3), the roasting temperature is 450-500 ℃ and the roasting time is 3-5 h.
19. The method for preparing flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 5, characterized in that the pillared zeolite is loaded with Mg2+The method comprises the following steps:
(1) adding deionized water into the prepared pillared zeolite as a carrier, and impregnating Mg (NO)3)2，
(2) Drying, roasting and grinding to obtain loaded Mg2+The drying temperature of the pillared zeolite is 110-120 ℃, the drying time is 4-5h, and the roasting time is 1-2 h.
20. The method for preparing a flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 19, characterized in that in the step (1), the dipping time is 10-12 h.
21. The method for preparing flocculant for synchronously removing ammonia nitrogen and phosphorus as claimed in claim 19, wherein in the step (2), the roasting temperature is 300-600 ℃.
22. The method for preparing the flocculant for synchronously removing ammonia nitrogen and phosphorus according to claim 19, characterized in that in the step (2), the flocculant is ground and sieved by a 100-mesh sieve.
23. The use of the flocculant for simultaneous removal of ammonia nitrogen and phosphorus according to claim 1 in domestic and industrial wastewater treatment.
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| CN117105483A (en) * | 2023-10-10 | 2023-11-24 | 青岛洁源环境有限公司 | Treatment method of landfill leachate based on deep flocculation |
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