CN113929169A - Synchronous nitrogen and phosphorus removal medicament and preparation method thereof - Google Patents
Synchronous nitrogen and phosphorus removal medicament and preparation method thereof Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 116
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 86
- 239000011574 phosphorus Substances 0.000 title claims abstract description 86
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 58
- 239000003814 drug Substances 0.000 title claims abstract description 53
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 64
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 36
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 36
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000000227 grinding Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 23
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 20
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 20
- 239000000292 calcium oxide Substances 0.000 claims abstract description 18
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 18
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 18
- 239000006247 magnetic powder Substances 0.000 claims abstract description 18
- 238000007873 sieving Methods 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000000440 bentonite Substances 0.000 claims description 33
- 229910000278 bentonite Inorganic materials 0.000 claims description 33
- 150000001875 compounds Chemical class 0.000 claims description 15
- 238000002791 soaking Methods 0.000 claims description 13
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 238000012986 modification Methods 0.000 claims description 10
- 230000004048 modification Effects 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 claims 3
- 238000001354 calcination Methods 0.000 claims 2
- 239000010865 sewage Substances 0.000 abstract description 12
- 238000003756 stirring Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 9
- 238000005303 weighing Methods 0.000 abstract description 9
- 238000004062 sedimentation Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 239000010802 sludge Substances 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 11
- 239000002244 precipitate Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 7
- 239000002351 wastewater Substances 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 6
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 4
- -1 ammonium ions Chemical class 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 229910001425 magnesium ion Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000010668 complexation reaction Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000012851 eutrophication Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- MXZRMHIULZDAKC-UHFFFAOYSA-L ammonium magnesium phosphate Chemical compound [NH4+].[Mg+2].[O-]P([O-])([O-])=O MXZRMHIULZDAKC-UHFFFAOYSA-L 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- GZHCNRONBGZNAH-UHFFFAOYSA-N phosphanylidynelanthanum Chemical compound [La]#P GZHCNRONBGZNAH-UHFFFAOYSA-N 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052567 struvite Inorganic materials 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000002552 dosage form Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000003018 phosphorus compounds Chemical class 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000012546 transfer 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
- C02F1/00—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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- 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
Abstract
The invention relates to the technical field of nitrogen and phosphorus-rich sewage treatment, and particularly relates to a synchronous nitrogen and phosphorus removal medicament and a preparation method thereof. The invention provides a synchronous nitrogen and phosphorus removal medicament, which specifically comprises the following components: modified bentonite, magnesium chloride, polyaluminum ferric chloride, quicklime and magnetic powder; also provides a preparation method of the synchronous denitrification and dephosphorization agent, which comprises the following steps: preparing modified bentonite by using lanthanum oxide; weighing raw materials, grinding, stirring and mixing evenly, and sieving to obtain the synchronous nitrogen and phosphorus removal medicament. The synchronous nitrogen and phosphorus removal medicament overcomes the defect that nitrogen and phosphorus are difficult to remove synchronously in the traditional process, has low production cost and good nitrogen and phosphorus removal effect, and not only has simple preparation process, but also has easy sedimentation of generated floccule, small sludge amount and avoids secondary pollution.
Description
Technical Field
The invention relates to the technical field of nitrogen and phosphorus-rich sewage treatment, and particularly relates to a synchronous nitrogen and phosphorus removal medicament and a preparation method thereof.
Background
With the recent industrial development of China, a large amount of sewage rich in nitrogen and phosphorus is generated in the production process of some chemical enterprises, and the sewage is directly discharged into water body environments such as rivers and the like, so that water body eutrophication is caused, and surface water and underground water are polluted, wherein the surface water and the underground water are the most main water supply sources in China at present, so that in order to restrain the problem of nitrogen and phosphorus pollution of the water body from spreading day by day, an effective nitrogen and phosphorus removal technology is required to be applied to link the current situation.
When the substances such as nitrogen, phosphorus and the like are discharged out of the environmental capacity of the water body, the eutrophication of the water body can be caused in a short period of time, the ecological balance is damaged, and the human health is influenced, so that the concentration of nitrogen and phosphorus discharged into the water body needs to be strictly controlled, and the problems of the transfer of nutrient elements, the circulation channel and the like are fundamentally solved. In the current form, nitrogen and phosphorus are difficult indexes to be controlled in the sewage treatment process, in practice, the total phosphorus concentration is difficult to be directly reduced to be below 0.5mg/L by a simple chemical precipitation method, the increasingly strict effluent standard cannot be met, and other nitrogen and phosphorus removal technologies have certain defects, so that the research and development of an integrated medicament capable of synchronously removing nitrogen and phosphorus can be realized, the treatment cost is reduced, and the simplification of the treatment process is an important development direction. The common advantages of chemical precipitation, physical precipitation, biological oxidation, adsorption separation and the like are fully exerted, the medicament for synchronously removing the nitrogen and phosphorus compounds is researched and developed, the problem of water eutrophication can be effectively solved, the water ecological environment is protected, and better economic and social benefits are generated.
Disclosure of Invention
The invention aims to provide a synchronous nitrogen and phosphorus removal medicament which is low in production cost, can realize efficient synchronous removal of nitrogen and phosphorus, is easy to settle floccules and is small in sludge amount, aiming at the technical problems in the prior art.
On one hand, the invention provides a synchronous denitrification and dephosphorization agent, which comprises the following components: modified bentonite, magnesium chloride, polyaluminum ferric chloride, quicklime and magnetic powder. Wherein the weight parts of the raw materials are as follows: 30-50 parts of modified bentonite, 20-40 parts of magnesium chloride, 5-10 parts of polyaluminum ferric chloride, 10-30 parts of quicklime and 5-10 parts of magnetic powder.
Furthermore, the modified bentonite is modified by adopting lanthanum oxide.
In another aspect of the present invention, a method for preparing the above synchronous denitrification and dephosphorization agent is provided, which comprises the following steps:
the method comprises the following steps: preparing modified bentonite: roasting bentonite, soaking the roasted bentonite in a lanthanum oxide aqueous solution for modification, filtering, drying, roasting, grinding and sieving to obtain the modified bentonite;
step two: taking the modified bentonite, the magnesium chloride, the polyaluminum ferric chloride, the quicklime and the magnetic powder according to the parts by weight, sequentially putting the materials into a grinding stirrer, continuously grinding and uniformly mixing to obtain a compound medicament;
step three: and sieving the compound medicament to obtain the synchronous denitrification and dephosphorization medicament.
Further, the roasting temperature before the modification of the bentonite in the step one is 450 ℃, and the roasting time is 2 hours.
Further, in the first step, the mass fraction of the lanthanum oxide aqueous solution is 20%, the soaking time is 3-6h, and the pH value of the solution is kept between 9 and 10 in the soaking process.
Further, in the first step, after the bentonite is modified, the drying temperature is 100 ℃, the roasting temperature is 500 ℃, the roasting time is 2 hours, and the size of a sieve mesh of a grinding sieve is 100 meshes.
Further, the size of the sieve holes sieved in the third step is 100 meshes.
The synchronous nitrogen and phosphorus removal agent provided by the invention can be directly put into sewage for use when being put into the sewage for use, and also can be put into the sewage for practical use after being prepared into other dosage forms such as tablets and the like. When the synchronous denitrification and dephosphorization agent is put in, the sewage is slightly acidic, and the optimal use condition is that the pH value of the sewage is 5-7.
The invention has the beneficial effects that: firstly, metal ions in quicklime and polyaluminium ferric chloride are combined with soluble phosphorus in water to generate a slightly soluble compound, and part of total phosphorus is removed; magnesium ions, phosphate radicals and ammonium ions react under a certain PH to generate magnesium ammonium phosphate precipitate, and most of phosphorus is removed; the excessive magnesium chloride can chemically react with phosphorus, so that phosphorus removal effect is achieved, magnesium ions react with the positive phosphorus in water to form small particle precipitates, and the small particle precipitates and colloidal phosphorus in the solution are adsorbed by polyaluminum ferric chloride at the same time; finally, the magnetic powder plays a role in magnetic coagulation, and the adsorbed modified bentonite containing phosphorus and other precipitates can be gathered together to form a high-density floc which is easy to precipitate. Secondly, the invention creatively adopts lanthanum oxide as a modifier to modify the bentonite, and lanthanum oxide aqueous solution is used for modifying the bentonite, so that the lanthanum oxide active component attached to the surface of the bentonite is complexed with hydroxyl in the aqueous solution, thereby forming a hydroxylated surface; the polynuclear hydroxyl compound in a meta-acid medium and phosphorus in water are subjected to a complexing reaction to form a phosphorus lanthanum complex which is more difficult to dissolve and more stable, and the hydrated ion radii of the phosphorus and the hydroxyl are similar, so that mutual exchange substitution is carried out in a modified bentonite lattice, surface complexation and ion exchange are performed synergistically, an efficient effect is exerted on the deep removal of total phosphorus, the removal of the total phosphorus is more thorough, and the concentration of the total phosphorus can be reduced to be below 0.5 mg/L. Thirdly, the modified bentonite prepared by the preparation method increases the adsorption amount of ammonia nitrogen in sewage, forms dispersed and uniform stable colloid, is easy to destabilize and precipitate by a small amount of metal salt, and realizes ammonia nitrogen removal. Therefore, the combination of the medicaments of the invention can generate better synergistic effect.
In conclusion, the synchronous nitrogen and phosphorus removal medicament overcomes the defect that nitrogen and phosphorus are difficult to remove synchronously in the traditional process, has low production cost and good nitrogen and phosphorus removal effect, and not only has simple preparation process, but also has easy sedimentation of generated floccule, small sludge amount and avoids secondary pollution.
Detailed Description
The invention discloses a synchronous nitrogen and phosphorus removal medicament and a preparation method thereof, and technical personnel in the field can appropriately improve process parameters by taking the contents of the invention as reference. The techniques of the present invention are specifically illustrated below by way of embodiments, which are merely examples to assist understanding of the present invention and should not be construed as limiting the present invention.
The synchronous nitrogen and phosphorus removal medicament comprises the following raw materials in parts by weight: 30-50 parts of modified bentonite, 20-40 parts of magnesium chloride, 5-10 parts of polyaluminum ferric chloride, 10-30 parts of quicklime and 5-10 parts of magnetic powder.
The preparation method of the synchronous nitrogen and phosphorus removal medicament comprises the following specific steps:
(1) preparing modified bentonite: roasting bentonite at 450 ℃ for 2h, soaking 100g of roasted bentonite in 500ml of 20% lanthanum oxide aqueous solution for modification, keeping the pH of the solution at 9-10 in the soaking modification process, soaking for 3-6h, washing with distilled water to be neutral, filtering, drying the filtered bentonite at 100 ℃, roasting at 500 ℃ for 2h, grinding and sieving, and obtaining the modified bentonite with the mesh size of 100 meshes;
(2) weighing modified bentonite, magnesium chloride, polyaluminum ferric chloride, quicklime and magnetic powder according to the parts by weight, sequentially putting into a grinding stirrer, continuously grinding, and uniformly stirring and mixing to obtain a compound medicament;
(3) and sieving the compound medicament to obtain the synchronous nitrogen and phosphorus removal medicament with the sieve mesh size of 100 meshes.
The technique of the present invention will be specifically described below with reference to specific examples.
Example 1: weighing 3g of modified bentonite, 2g of magnesium chloride, 0.5g of polyaluminum ferric chloride, 1g of quicklime and 0.5g of magnetic powder, grinding by using a grinding stirrer, stirring for 30min by using a stirrer to uniformly mix the components, and sieving the uniformly mixed compound medicament by using a 100-mesh sieve to obtain the synchronous nitrogen and phosphorus removal medicament.
Example 2: weighing 4g of modified bentonite, 3g of magnesium chloride, 0.8g of polyaluminum ferric chloride, 2g of quicklime and 0.8g of magnetic powder, grinding by using a grinding stirrer, stirring for 30min by using a stirrer to uniformly mix the components, and sieving the uniformly mixed compound medicament by using a 100-mesh sieve to obtain the synchronous nitrogen and phosphorus removal medicament.
Example 3: weighing 5g of modified bentonite, 4g of magnesium chloride, 1g of polyaluminum ferric chloride, 3g of quicklime and 1g of magnetic powder, grinding by using a grinding stirrer, stirring for 30min by using a stirrer to uniformly mix the components, and sieving the uniformly mixed compound medicament by using a 100-mesh sieve to obtain the synchronous nitrogen and phosphorus removal medicament.
Example 4: weighing 5g of modified bentonite, 3g of magnesium chloride, 1g of polyaluminum ferric chloride, 2g of quicklime and 1g of magnetic powder, grinding by using a grinding stirrer, stirring for 30min by using a stirrer to uniformly mix the components, and sieving the uniformly mixed compound medicament by using a 100-mesh sieve to obtain the synchronous nitrogen and phosphorus removal medicament.
In the above examples 1 to 4, modified bentonite was prepared by the following method: roasting bentonite at 450 ℃ for 2h, soaking 100g of roasted bentonite in 500mL of 20% lanthanum oxide aqueous solution for 5h, keeping the pH of the solution at 9-10 in the soaking modification process, washing the solution to be neutral by using distilled water, drying the filtered bentonite at 100 ℃, roasting the filtered bentonite at 500 ℃ for 2h, grinding and sieving the roasted bentonite with a sieve mesh size of 100 meshes to obtain the modified bentonite for later use.
Comparative example 1: weighing 5g of bentonite before modification, 3g of magnesium chloride, 1g of polyaluminum ferric chloride, 2g of quicklime and 1g of magnetic powder, grinding by using a grinding stirrer, stirring for 30min by using a stirrer to uniformly mix the components, and sieving the uniformly mixed compound medicament by using a 100-mesh sieve to obtain the synchronous nitrogen and phosphorus removal medicament.
Comparative example 2: weighing 5g of bentonite which is not modified by lanthanum oxide (the preparation method of the bentonite which is not modified by lanthanum oxide comprises the steps of roasting the bentonite at 450 ℃ for 2h, then soaking the bentonite in water for 5h, keeping the pH value of the solution between 9 and 10 in the soaking modification process, drying the filtered bentonite at 100 ℃, roasting the bentonite at 500 ℃ for 2h, grinding the bentonite and then sieving the bentonite with a 100-mesh sieve), grinding 3g of magnesium chloride, 1g of polyaluminum ferric chloride, 2g of quicklime and 1g of magnetic powder by using a grinding stirrer, stirring the ground mixture for 30min by using the stirrer to uniformly mix the components, and sieving the uniformly mixed compound medicament with the 100-mesh sieve to obtain the synchronous nitrogen and phosphorus removal medicament.
Comparative example 3: weighing 5g of modified bentonite, 3g of magnesium chloride, 1g of polyaluminum ferric chloride and 2g of quicklime, grinding by using a grinding stirrer, stirring for 30min by using a stirrer to uniformly mix the components, and sieving the uniformly mixed compound medicament by using a 100-mesh sieve to obtain the synchronous denitrification and dephosphorization medicament.
The raw materials are all conventional types sold in the market and have no special requirements. The specific specifications and manufacturers are as follows: bentonite, specification calcium base, greater than or equal to 95%, manufacturer Weifang Hongxiang Bentonite Limited company; magnesium chloride, anhydrous magnesium chloride with the specification of 98%, and the manufacturer Weifang Yuze chemical company Limited; polyaluminum ferric chloride with the specification of more than or equal to 88 percent, and the manufacturer Henan Lian Cheng environmental protection science and technology Limited; calcium content of the quicklime is more than or equal to 95% in specification, and Jiangsu Fuda chemical industry Co., Ltd is manufactured; magnetic powder with the specification of more than or equal to 73 percent, environmental protection science and technology limited of Tianbang, Jiangsu.
The following tests were carried out on the prepared simultaneous phosphorus and nitrogen removal agent:
experiment one: denitrification and dephosphorization effect
The synchronous nitrogen and phosphorus removal medicament prepared in the example 1, the example 2, the example 3 and the example 4 and the comparative example 1 and the comparative example 2 is used for leachate wastewater (the ammonia nitrogen content is 91.699mg/L and the total phosphorus content is 1449.581mg/L) of a slag yard of a certain Guizhou company, and is added in a laboratory for treatment test.
The method comprises the following specific steps:
(1) experiments are divided into 6 groups according to the prepared synchronous nitrogen and phosphorus removal medicaments, and the prepared synchronous nitrogen and phosphorus removal medicaments of example 1, example 2, example 3 and example 4 and the prepared synchronous nitrogen and phosphorus removal medicaments of comparative example 1 and comparative example 2 are respectively used;
(2) in each experiment, four 1L of wastewater samples of leachate from a slag yard of a certain Guizhou company are taken, the PH of the wastewater samples is adjusted to be 5-7, 0.8g, 1g, 1.2g and 1.4g of synchronous denitrification and dephosphorization agents are respectively added, stirring and standing sedimentation are carried out for 20min, and then ammonia Nitrogen (NH) in the supernatant is detected3-N) content and Total Phosphorus (TP) content, the experimental results are shown in the following table:
the experimental data show that the nitrogen and phosphorus removal effect of the synchronous nitrogen and phosphorus removal medicament prepared in the examples 1-4 is obviously better than that of the synchronous nitrogen and phosphorus removal medicament prepared in the comparative examples 1-2, and when the dosage of the synchronous nitrogen and phosphorus removal medicament prepared in the examples 1-4 is more than 1200mg/L, the total phosphorus concentration can be directly reduced to be less than 0.5 mg/L.
In examples 1 to 4, lanthanum oxide is used as a modifier to modify bentonite, lanthanum oxide aqueous solution is used to modify bentonite, so that lanthanum oxide active components attached to the surface of bentonite are complexed with hydroxyl in aqueous solution to form a hydroxylated surface, a polynuclear hydroxyl compound in a meta-acid medium and phosphorus in water are subjected to complexation reaction to form a stable phosphorus-lanthanum complex, and the radii of hydrated ions of phosphorus and hydroxyl are similar, so that mutual exchange substitution is performed in crystal lattices of the modified bentonite, and the surface complexation and ion exchange effect are performed synergistically to achieve efficient phosphorus removal. The modified bentonite can also increase the adsorption capacity of ammonia nitrogen in sewage, form dispersed and uniform stable colloid, is easy to destabilize and precipitate by a small amount of metal salt, and realizes denitrification; magnesium chloride can chemically react with phosphorus, and has a phosphorus removal effect, magnesium ions react with the positive phosphorus in water to form small particle precipitates, and the small particle precipitates and colloidal phosphorus in the solution are adsorbed by polyaluminum ferric chloride at the same time; magnesium ions, phosphate radicals and ammonium ions react to generate magnesium ammonium phosphate precipitate, so that phosphorus is removed more thoroughly; metal ions in the quicklime and the polyaluminium ferric chloride are combined with soluble phosphorus in water to generate a slightly soluble compound; the magnetic powder plays a role in magnetic coagulation, and can gather the modified bentonite adsorbed with the phosphorus element and other precipitates together to form a large-density floc which is easy to precipitate.
Therefore, the raw materials of the synchronous nitrogen and phosphorus removal agents prepared in the examples 1 to 4 are compounded together to generate better synergistic effect. Under the condition of the same dosage, the synchronous nitrogen and phosphorus removal medicament prepared by the proportion in the embodiment 4 has better nitrogen and phosphorus removal effect, and the optimal dosage of the synchronous nitrogen and phosphorus removal medicament provided by the invention is 1200 mg/L.
Experiment two: sedimentation velocity of flocs
The synchronous nitrogen and phosphorus removal agents prepared in example 4 and comparative example 3 were used for the leachate wastewater (ammonia nitrogen content of 91.699mg/L and total phosphorus content of 1449.581mg/L) of a certain company in Guizhou, and a settling test was performed in a laboratory.
The method comprises the following specific steps:
(1) the experiment is divided into 2 groups according to the prepared synchronous nitrogen and phosphorus removal medicaments, and the synchronous nitrogen and phosphorus removal medicaments prepared in the example 4 and the comparative example 3 are respectively used;
(2) in each experiment, 1L of 1 part of wastewater sample of leachate from a slag yard of a certain Guizhou company is taken, the PH value of the wastewater sample is adjusted to be 5-7, 1.2g of synchronous denitrification and dephosphorization agent is respectively added, stirring and standing precipitation are carried out, and the ammonia Nitrogen (NH) in the supernatant of the wastewater is detected for 5min, 10min, 15min and 20min3-N) content and Total Phosphorus (TP) content, the experimental results are shown in the following table:
according to experimental data, the sedimentation speed of the floccule of the synchronous nitrogen and phosphorus removal medicament prepared in the embodiment 4 is obviously superior to that of the synchronous nitrogen and phosphorus removal medicament prepared in the comparative example 3, and under the condition of the same dosage, the magnetic powder plays a role of magnetic coagulation, so that the adsorbed modified bentonite and other precipitates can be quickly gathered together to form a high-density floccule, and the sedimentation of the floccule is accelerated.
It will be apparent to those skilled in the art that the present invention is not limited to the exemplary embodiments described above, and that the present invention is not limited to the specific embodiments disclosed and described above, and that modifications and variations of the present invention are also intended to fall within the scope of the appended claims.
Claims (7)
1. The synchronous nitrogen and phosphorus removal medicament is characterized by comprising the following components in parts by weight: 30-50 parts of modified bentonite, 20-40 parts of magnesium chloride, 5-10 parts of polyaluminum ferric chloride, 10-30 parts of quicklime and 5-10 parts of magnetic powder.
2. The reagent of claim 1, wherein the modified bentonite is modified with lanthanum oxide.
3. The preparation method of the synchronous denitrification and dephosphorization agent according to any one of the claims 1-2, which comprises the following steps:
the method comprises the following steps: preparing modified bentonite: roasting bentonite, soaking the roasted bentonite in a lanthanum oxide aqueous solution for modification, filtering, drying, roasting, grinding and sieving to obtain the modified bentonite;
step two: taking the modified bentonite, the magnesium chloride, the polyaluminum ferric chloride, the quicklime and the magnetic powder according to the parts by weight, sequentially putting the materials into a grinding stirrer, continuously grinding and uniformly mixing to obtain a compound medicament;
step three: and sieving the compound medicament to obtain the synchronous denitrification and dephosphorization medicament.
4. The method for preparing a reagent for simultaneous phosphorus and nitrogen removal as claimed in claim 3, wherein the calcination temperature of the bentonite in the first step before modification is 450 ℃ and the calcination time is 2 h.
5. The method for preparing a medicament for simultaneous phosphorus and nitrogen removal as claimed in claim 3, wherein the lanthanum oxide aqueous solution in the first step has a mass fraction of 20%, the soaking time is 3-6h, and the pH of the solution is maintained at 9-10 during the soaking process.
6. The method for preparing a synchronous denitrification and dephosphorization agent according to claim 3, wherein the bentonite modified in the first step is dried at 100 ℃, roasted at 500 ℃ for 2 hours, and the size of the mesh of the grinding sieve is 100 meshes.
7. The method for preparing a reagent for simultaneous phosphorus and nitrogen removal as claimed in claim 3, wherein the size of the mesh of the screen in step three is 100 mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111424783.2A CN113929169A (en) | 2021-11-26 | 2021-11-26 | Synchronous nitrogen and phosphorus removal medicament and preparation method thereof |
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|---|---|---|---|---|
| CN116173973A (en) * | 2023-04-14 | 2023-05-30 | 四川省生态环境科学研究院 | Composite material of nano lanthanum peroxide and carrier, and preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005028272A (en) * | 2003-07-11 | 2005-02-03 | Kunimine Industries Co Ltd | Phosphorus-component adsorbent and method for wastewater treatment by using the adsorbent |
| JP2005205368A (en) * | 2004-01-26 | 2005-08-04 | Kurita Water Ind Ltd | Adsorbent and water treatment method |
| CN105502563A (en) * | 2015-12-25 | 2016-04-20 | 广西明清环保科技有限公司 | Composite purification agent for municipal domestic wastewater |
| CN110548490A (en) * | 2018-05-31 | 2019-12-10 | 华中科技大学 | Preparation method and application of recyclable lanthanum modified bentonite phosphorus removal material |
-
2021
- 2021-11-26 CN CN202111424783.2A patent/CN113929169A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005028272A (en) * | 2003-07-11 | 2005-02-03 | Kunimine Industries Co Ltd | Phosphorus-component adsorbent and method for wastewater treatment by using the adsorbent |
| JP2005205368A (en) * | 2004-01-26 | 2005-08-04 | Kurita Water Ind Ltd | Adsorbent and water treatment method |
| CN105502563A (en) * | 2015-12-25 | 2016-04-20 | 广西明清环保科技有限公司 | Composite purification agent for municipal domestic wastewater |
| CN110548490A (en) * | 2018-05-31 | 2019-12-10 | 华中科技大学 | Preparation method and application of recyclable lanthanum modified bentonite phosphorus removal material |
Non-Patent Citations (2)
| Title |
|---|
| 商平等: "《环境矿物材料》", 化学工业出版社, pages: 69 - 70 * |
| 柴锡炯等: ""稀土氧化物及黏土负载La2O3除磷性能的实验研究"", 《岩石矿物学杂志》, vol. 38, no. 6, pages 799 - 806 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116173973A (en) * | 2023-04-14 | 2023-05-30 | 四川省生态环境科学研究院 | Composite material of nano lanthanum peroxide and carrier, and preparation method and application thereof |
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