CN112191222A - Modified medical stone filter material for treating ammonia nitrogen industrial wastewater and preparation method thereof - Google Patents
Modified medical stone filter material for treating ammonia nitrogen industrial wastewater and preparation method thereof Download PDFInfo
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- CN112191222A CN112191222A CN202010957741.4A CN202010957741A CN112191222A CN 112191222 A CN112191222 A CN 112191222A CN 202010957741 A CN202010957741 A CN 202010957741A CN 112191222 A CN112191222 A CN 112191222A
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- 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
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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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- 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
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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Abstract
The invention discloses a modified medical stone filter material for treating ammonia nitrogen industrial wastewater and a preparation method thereof. The modified medical stone filter material is prepared by the following steps: a. cleaning Maifanitum, soaking in hydrochloric acid solution to obtain acid-treated Maifanitum; b. adding into mixed solution of carboxymethyl chitosan, sodium alginate and water, heating and stirring for reaction to obtain Maifanitum with surface active groups; c. adding the mixture into a sodium hydroxide solution for soaking and reacting, filtering, adding an ammonium magnesium phosphate sinter and sodium bicarbonate, performing die pressing and drying to obtain the modified medical stone filter material for treating the ammonia nitrogen industrial wastewater. The method has the following beneficial effects: the medical stone filter material prepared by the invention has surface active groups and good adsorption performance, can play the adsorption role of medical stone on ammonia nitrogen in ammonia nitrogen wastewater treatment, can improve the removal capacity of ammonia nitrogen in water through the adsorption of added ammonium magnesium phosphate sinter, and has the advantages of simple preparation process, safety, environmental protection and no secondary pollution.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a filter material for ammonia nitrogen sewage treatment, and especially relates to a modified medical stone filter material for treating ammonia nitrogen industrial wastewater and a preparation method thereof.
Background
Ammonia nitrogen is one of common pollutants in water, mainly comes from chemical fertilizers, coking, petrifaction, pharmacy, foods, refuse landfills and the like, and a large amount of ammonia nitrogen wastewater is discharged into the water, so that not only is the water eutrophication caused and the water black and odorous, but also the water eutrophication is caused by the over-standard ammonia nitrogen content, the water black and odorous and a large amount of fishes die, even toxic action is generated on people and organisms, and the serious environmental pollution problem is caused, so that the treatment of the ammonia nitrogen wastewater becomes a key topic of the current society. The treatment process with better practicability aiming at the ammonia nitrogen wastewater mainly comprises a biological denitrification method, an ammonia stripping method, a breakpoint chlorination method, an ion exchange method and the like.
At present, the biological nitrification method commonly used for treating ammonia nitrogen in water has the advantages of low efficiency, long period, high cost, inapplicability to partial water treatment plants and high implementation difficulty, and the adsorption method has the advantages of low cost and simple and convenient operation for treating ammonia nitrogen. Maifanitum is a natural silicate mineral, has no toxicity and harm to living things, and has certain bioactivity. The medical stone mainly comprises silicon dioxide and aluminum oxide, has porosity and strong adsorption capacity, has better purification effect on water quality, and can be used as an adsorbent for treating ammonia nitrogen wastewater. However, the natural medical stone has limited extraction capacity, and the adsorption performance of the natural medical stone can be improved, and the modified filter material is based on a migration and adsorption mechanism, and the surface property of the modified filter material is changed by adhering a modifier to the surface of the filter material through a physical or chemical reaction means, so that the filtering function of the traditional filter material can be maintained, and the adsorption performance of the modified filter material on specific pollutants can be improved.
Patent application No. 201410781079.6 discloses a preparation method of modified medical stone. The method comprises the steps of roasting and crushing medical stone, screening the medical stone with the particle size of 40-80 meshes, soaking the medical stone with a hydrogen chloride solution by ultrasonic radiation with the power of 60W step by step, soaking the medical stone with a sodium chloride solution at the negative pressure of 10-30 MPa, soaking the medical stone with a lithium chloride solution at the temperature of 25 ℃ in an oscillating manner at the speed of 180r/min, soaking the medical stone with an aluminum chloride solution at the temperature of 90 ℃ in an oscillating manner at the speed of 100r/min, and soaking the medical stone with hydrogen peroxide.
Patent application No. 201310720358.7 discloses a medical stone water purifying agent for rapidly purifying a mariculture water body, which is characterized in that the rapid mariculture water purifying agent mainly comprises medical stone and rice hulls. The finished product is obtained by micro-cutting assisted crushing, soaking and stirring, extruding and drying, screening and packaging. In the process of water purification and filtration, the specific surface area of medical stone is increased by micro-cutting assisted technology, particulate and colloidal pollutants are adsorbed and removed, and main pollutants of water eutrophication, such as ammonia nitrogen, nitrite nitrogen and H, can be effectively removed2S and other harmful substances.
The patent application number 201510070284.6 discloses a water body purification composite flocculant and a preparation and application method thereof, the flocculant is prepared by comprehensively compounding diatomite, polyaluminium chloride and medical stone with specific dosage and adopting a mixing and drying mode, the preparation process is simple, the raw materials are easy to obtain, the cost is low, and the obtained water body purification composite flocculant is non-toxic and harmless and is suitable for large-scale production. The application method of the water body purification composite flocculant is simple and easy to implement, low in cost, small in dosage and quick in effect, has a good removal effect on total phosphorus, algae, turbidity and the like in water, and also has a good removal effect on CODMn, total nitrogen and ammonia nitrogen.
Patent application No. 201710152510.4 discloses a low-cost printing and dyeing wastewater treatment agent, which is composed of the following raw materials in parts by weight: 20-25 parts of polyacrylamide, 45-50 parts of fly ash, 12-18 parts of chitosan, 30-35 parts of straw powder, 25-30 parts of saw powder, 8-12 parts of sodium acetate, 12-16 parts of active medical stone, 15-19 parts of polymeric aluminum ferric sulfate, 3-6 parts of magnesium sulfate, 21-24 parts of cationic starch derivative, 2-5 parts of glyceryl monostearate, 6-10 parts of fluorite and 3-7 parts of sodium lignosulfonate. The printing and dyeing wastewater treatment agent prepared by the method has high-efficiency purification capacity, can effectively reduce COD, BOD, SS, ammonia nitrogen and chromaticity in domestic sewage, has a good treatment effect, is convenient to use, and greatly reduces the treatment difficulty of printing and dyeing wastewater.
Therefore, in the prior art, when natural medical stone is used for treating pollutants such as ammonia nitrogen and the like in a water body, the removal capacity is quite limited, the problem can be improved by modifying the filter material, but the existing modification technology has the problem of unsatisfactory effect.
Disclosure of Invention
In order to effectively solve the technical problems, the invention provides a modified medical stone filter material for treating ammonia nitrogen industrial wastewater and a preparation method thereof, which can effectively improve the adsorption performance of the medical stone filter material and have strong removal capability on ammonia nitrogen pollutants in the wastewater.
The specific technical scheme of the invention is as follows:
a modified medical stone filter material for treating ammonia nitrogen industrial wastewater is prepared by soaking medical stone in a hydrochloric acid solution for treatment, taking out the modified medical stone filter material, adding carboxymethyl chitosan and sodium alginate into water, heating and stirring, taking out a solid, adding a sodium hydroxide solution for soaking, filtering out the solid after the soaking, adding ammonium magnesium phosphate sinter and sodium bicarbonate, carrying out die pressing, and drying. The preparation method comprises the following specific steps:
a. washing Maifanitum with deionized water, adding into 0.1mol/L hydrochloric acid solution, soaking for a period of time, filtering, and washing with deionized water for multiple times to obtain acid-treated Maifanitum;
b. b, adding the acid-treated medical stone prepared in the step a into a mixed solution consisting of carboxymethyl chitosan, sodium alginate and water, heating and stirring, and filtering out after the heating and stirring are finished to prepare the medical stone with surface active groups;
c. and c, adding the medical stone with surface active groups prepared in the step b into 0.1mol/L sodium hydroxide solution for soaking, filtering out solids after the soaking, adding ammonium magnesium phosphate sinter and sodium bicarbonate, and performing mould pressing and drying to prepare the modified medical stone filter material for treating the ammonia nitrogen industrial wastewater.
Preferably, in the step a, the particle size of the medical stone is 0.8-1.2 mm.
Preferably, in the step a, the mass ratio of the medical stone to the hydrochloric acid solution is 1: 5-10.
Preferably, in the step a, the soaking time is 1-3 h.
Preferably, in the step b, the heating and stirring temperature is 50-90 ℃, the stirring speed is 500-600 r/min, and the time is 3-5 h.
Preferably, in the step b, 30 to 40 parts by weight of medical stone, 10 to 20 parts by weight of carboxymethyl chitosan, 1 to 3 parts by weight of sodium alginate and 100 parts by weight of water.
Preferably, in the step c, the mass ratio of the medical stone with surface active groups to the sodium hydroxide solution is 1: 5-10.
Preferably, in the step c, the soaking time is 2-4 hours.
Preferably, in the step c, the amount of the magnesium ammonium phosphate sinter is 5-10% of the mass of the medical stone with surface active groups; the amount of sodium bicarbonate is 0.5-1% of the mass of Maifanitum with surface active group. The drying temperature is controlled at 100 ℃, so that the sodium bicarbonate molded material foams to generate abundant pores. The magnesium ammonium phosphate sinter is a product obtained by sintering magnesium ammonium phosphate at 80 ℃ for 2 hours.
Although the medical stone can absorb ammonia nitrogen pollutants through ion exchange and surface coordination, the adsorption efficiency is low, and chitosan molecules contain a plurality of active hydroxyl groups, particularly hydroxymethyl chitosan serving as a water-soluble chitosan derivative is crosslinked with carboxymethyl chitosan under the action of an auxiliary agent sodium alginate, so that the surface active groups of the medical stone filter material can be effectively increased, and the adsorption performance of the medical stone filter material is remarkably improved.
The invention also provides a modified medical stone filter material for treating ammonia nitrogen industrial wastewater, which is prepared by the following steps: a. cleaning Maifanitum, soaking in hydrochloric acid solution to obtain acid-treated Maifanitum; b. adding into mixed solution of carboxymethyl chitosan, sodium alginate and water, heating and stirring to obtain Maifanitum with surface active groups; c. adding the mixture into a sodium hydroxide solution for soaking and reacting, filtering, adding an ammonium magnesium phosphate sinter and sodium bicarbonate, performing die pressing and drying to obtain the modified medical stone filter material for treating the ammonia nitrogen industrial wastewater.
The invention has the beneficial effects that:
1. provides a method for preparing a modified medical stone filter material for treating ammonia nitrogen industrial wastewater by modifying the surface of medical stone by using hydroxymethyl chitosan.
2. According to the invention, the medical stone is modified with carboxymethyl chitosan under the action of the auxiliary agent sodium alginate, so that the surface active groups of the medical stone filter material are increased, and the adsorption performance of the medical stone filter material is improved.
3. The medical stone filter material prepared by the invention can not only play the adsorption role of medical stone on ammonia nitrogen in the treatment of ammonia nitrogen wastewater, but also improve the removal capacity of ammonia nitrogen in water by adding the adsorbability of magnesium ammonium phosphate sinter.
4. The preparation process is simple, and the prepared modified medical stone filter material has the advantages of safety, environmental protection, no secondary pollution and the like.
Drawings
FIG. 1: a picture of a modified medical stone filter material obtained in example 1.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
a. Washing medical stone with the average particle size of 1.1mm by using deionized water, and adding the washed medical stone into 0.1mol/L hydrochloric acid solution, wherein the mass ratio of the medical stone to the hydrochloric acid solution is 1: 7; soaking for 2h, filtering, and washing with deionized water for multiple times to obtain acid-treated Maifanitum;
b. b, adding the acid-treated medical stone prepared in the step a into a mixed solution consisting of carboxymethyl chitosan, sodium alginate and water, heating and stirring at the temperature of 70 ℃, wherein the stirring speed is 560r/min, and the time is 4 hours; filtering to obtain Maifanitum with surface active group; wherein, 34 parts of medical stone, 14 parts of carboxymethyl chitosan, 2 parts of sodium alginate and 100 parts of water;
c. and c, adding the medical stone with the surface active groups prepared in the step b into 0.1mol/L sodium hydroxide solution for soaking according to the mass ratio of the medical stone with the surface active groups to the sodium hydroxide solution of 1:7, soaking for 3h, filtering out solid substances after the reaction is finished, adding ammonium magnesium phosphate sinter and sodium bicarbonate, carrying out die pressing, and drying at 100 ℃ to obtain the modified medical stone filter material for treating the ammonia nitrogen industrial wastewater. The usage amount of the magnesium ammonium phosphate sinter is 5 percent of the mass of the medical stone with surface active groups; the amount of sodium bicarbonate is 0.5% of the mass of Maifanitum with surface active group. The magnesium ammonium phosphate sinter is a product obtained by sintering magnesium ammonium phosphate at 80 ℃ for 2 hours. As shown in fig. 1, the filter material foamed by the mold drying has abundant micropores.
Example 2
a. Washing medical stone with the average particle size of 0.8mm by using deionized water, and adding the washed medical stone into 0.1mol/L hydrochloric acid solution, wherein the mass ratio of the medical stone to the hydrochloric acid solution is 1: 5; soaking for 1h, filtering, and washing with deionized water for several times to obtain acid-treated Maifanitum;
b. b, adding the acid-treated medical stone prepared in the step a into a mixed solution consisting of carboxymethyl chitosan, sodium alginate and water, heating and stirring at the temperature of 50 ℃, the stirring speed of 500r/min and the stirring time of 5 h; filtering to obtain Maifanitum with surface active group; wherein, 30 parts of medical stone, 10 parts of carboxymethyl chitosan, 1 part of sodium alginate and 120 parts of water by weight;
c. and (b) adding the medical stone with surface active groups prepared in the step (b) into 0.1mol/L sodium hydroxide solution for soaking according to the mass ratio of the medical stone with surface active groups to the sodium hydroxide solution of 1:5, wherein the soaking time is 2 hours, filtering out solid substances after the reaction is finished, adding ammonium magnesium phosphate sinter and sodium bicarbonate, carrying out die pressing, and drying at 100 ℃ to obtain the modified medical stone filter material for treating ammonia nitrogen industrial wastewater. The dosage of the magnesium ammonium phosphate sinter is 8 percent of the mass of the medical stone with surface active groups; the amount of sodium bicarbonate is 0.5% of the mass of Maifanitum with surface active group. The magnesium ammonium phosphate sinter is a product obtained by sintering magnesium ammonium phosphate at 80 ℃ for 2 hours.
Example 3
a. Washing medical stone with the average particle size of 1.2mm by using deionized water, adding the medical stone into 0.1mol/L hydrochloric acid solution, soaking for 3 hours, filtering, and washing for multiple times by using the deionized water to prepare acid-treated medical stone, wherein the mass ratio of the medical stone to the hydrochloric acid solution is 1: 10;
b. b, adding the acid-treated medical stone prepared in the step a into a mixed solution consisting of carboxymethyl chitosan, sodium alginate and water, heating and stirring at the temperature of 90 ℃, the stirring speed of 600r/min and the stirring time of 3 h; filtering to obtain Maifanitum with surface active group; wherein, 40 parts of medical stone, 20 parts of carboxymethyl chitosan, 3 parts of sodium alginate and 120 parts of water by weight;
c. and (b) adding the medical stone with surface active groups prepared in the step (b) into 0.1mol/L sodium hydroxide solution for soaking according to the mass ratio of the medical stone with surface active groups to the sodium hydroxide solution of 1: 10, wherein the soaking time is 4 hours, filtering out solid substances after the reaction is finished, adding ammonium magnesium phosphate sinter and sodium bicarbonate, carrying out die pressing, and drying at 100 ℃ to obtain the modified medical stone filter material for treating ammonia nitrogen industrial wastewater. The usage amount of the magnesium ammonium phosphate sinter is 10 percent of the mass of the medical stone with surface active groups; the amount of sodium bicarbonate is 0.8% of the mass of Maifanitum with surface active group. The magnesium ammonium phosphate sinter is a product obtained by sintering magnesium ammonium phosphate at 80 ℃ for 2 hours.
Example 4
a. Washing medical stone with an average particle size of 0.9mm by using deionized water, adding the medical stone into 0.1mol/L hydrochloric acid solution, soaking for 1.5h, filtering, and washing for multiple times by using deionized water to prepare acid-treated medical stone, wherein the mass ratio of the medical stone to the hydrochloric acid solution is 1: 6;
b. b, adding the acid-treated medical stone prepared in the step a into a mixed solution consisting of carboxymethyl chitosan, sodium alginate and water, heating and stirring at the temperature of 60 ℃, and stirring at the rotating speed of 580r/min for 4.5 hours; filtering to obtain Maifanitum with surface active group; wherein, 32 parts of medical stone, 12 parts of carboxymethyl chitosan, 1 part of sodium alginate and 130 parts of water;
c. and (b) adding the medical stone with surface active groups prepared in the step (b) into 0.1mol/L sodium hydroxide solution for soaking according to the mass ratio of the medical stone with surface active groups to the sodium hydroxide solution of 1:7, wherein the soaking time is 2.5h, filtering out solids after the reaction is finished, adding ammonium magnesium phosphate sinter and sodium bicarbonate, carrying out die pressing, and drying at 100 ℃ to obtain the modified medical stone filter material for treating ammonia nitrogen industrial wastewater. The usage amount of the magnesium ammonium phosphate sinter is 10 percent of the mass of the medical stone with surface active groups; the amount of sodium bicarbonate is 1% of the mass of the medical stone with surface active groups. The magnesium ammonium phosphate sinter is a product obtained by sintering magnesium ammonium phosphate at 80 ℃ for 2 hours.
Comparative example 1
a. Washing medical stone with the average particle size of 1.1mm by using deionized water, and adding the washed medical stone into 0.1mol/L hydrochloric acid solution, wherein the mass ratio of the medical stone to the hydrochloric acid solution is 1: 7; soaking for 2h, filtering, and washing with deionized water for multiple times to obtain acid-treated Maifanitum;
b. b, adding the acid-treated medical stone prepared in the step a into a mixed solution consisting of sodium alginate and water, heating and stirring at the temperature of 70 ℃, wherein the stirring speed is 560r/min, and the stirring time is 4 hours; filtering to obtain Maifanitum with surface active group; wherein, 34 parts of medical stone, 2 parts of sodium alginate and 100 parts of water;
c. and c, adding the medical stone with the surface active groups prepared in the step b into 0.1mol/L sodium hydroxide solution for soaking according to the mass ratio of the medical stone with the surface active groups to the sodium hydroxide solution of 1:7, soaking for 3h, filtering out solid substances after the reaction is finished, adding ammonium magnesium phosphate sinter and sodium bicarbonate, carrying out die pressing, and drying at 100 ℃ to obtain the modified medical stone filter material for treating the ammonia nitrogen industrial wastewater. The usage amount of the magnesium ammonium phosphate sinter is 5 percent of the mass of the medical stone with surface active groups; the amount of sodium bicarbonate is 0.5% of the mass of Maifanitum with surface active group. The magnesium ammonium phosphate sinter is a product obtained by sintering magnesium ammonium phosphate at 80 ℃ for 2 hours.
Comparative example 1 no medical stone was treated with carboxymethyl chitosan.
Comparative example 2
a. Washing medical stone with the average particle size of 1.1mm by using deionized water, and adding the washed medical stone into 0.1mol/L hydrochloric acid solution, wherein the mass ratio of the medical stone to the hydrochloric acid solution is 1: 7; soaking for 2h, filtering, and washing with deionized water for multiple times to obtain acid-treated Maifanitum;
b. b, adding the acid-treated medical stone prepared in the step a into a mixed solution consisting of carboxymethyl chitosan, sodium alginate and water, heating and stirring at the temperature of 70 ℃, wherein the stirring speed is 560r/min, and the time is 4 hours; filtering to obtain Maifanitum with surface active group; wherein, 34 parts of medical stone, 14 parts of carboxymethyl chitosan, 2 parts of sodium alginate and 100 parts of water;
c. and c, adding the medical stone with the surface active groups prepared in the step b into 0.1mol/L sodium hydroxide solution for soaking according to the mass ratio of the medical stone with the surface active groups to the sodium hydroxide solution of 1:7, soaking for 3h, filtering out solid after the reaction is finished, adding sodium bicarbonate, carrying out die pressing, and drying at 100 ℃ to obtain the modified medical stone filter material for treating the ammonia nitrogen industrial wastewater. The amount of sodium bicarbonate is 0.5% of the mass of Maifanitum with surface active group. The magnesium ammonium phosphate sinter is a product obtained by sintering magnesium ammonium phosphate at 80 ℃ for 2 hours.
Comparative example 2 magnesium ammonium phosphate sinter was not added to assist in increasing ammonia nitrogen adsorption.
The modified medical stone filter materials prepared in the above examples 1-4 and the comparative example 1 were tested for ammonia nitrogen mass concentration in sewage of ammonia nitrogen wastewater treatment experiments, and the test characterization methods or conditions were as follows:
ammonia nitrogen mass concentration of ammonia nitrogen wastewater treatment experiment: cutting 50g of medical stone filter material, adding 5000mL of ammonia nitrogen sewage, wherein the sewage is ammonia nitrogen simulation sewage with the mass concentration of 100mg/L, soaking at the constant temperature of 28 ℃, sampling at 15min, 30min, 60min and 120min respectively, measuring the residual ammonia nitrogen concentration by adopting a Nashin reagent photometry, making 3 parallel samples each time, and taking an average value.
The results are shown in Table 1.
Table 1:
Claims (10)
1. a preparation method of a modified medical stone filter material for treating ammonia nitrogen industrial wastewater is characterized by comprising the following steps: the modified medical stone filter material is prepared by soaking medical stone in a hydrochloric acid solution for treatment, taking out the medical stone, adding carboxymethyl chitosan and sodium alginate into water, heating and stirring the mixture, taking out solid substances, adding a sodium hydroxide solution for soaking reaction, filtering out the solid substances after the reaction is finished, adding ammonium magnesium phosphate sinter and sodium bicarbonate, performing die pressing and drying, and preparing the modified medical stone filter material for treating ammonia nitrogen industrial wastewater, wherein the specific preparation steps are as follows:
a. washing Maifanitum with deionized water, adding into 0.1mol/L hydrochloric acid solution, soaking for a period of time, filtering, and washing with deionized water for multiple times to obtain acid-treated Maifanitum;
b. b, adding the acid-treated medical stone prepared in the step a into a mixed solution consisting of carboxymethyl chitosan, sodium alginate and water, heating and stirring, and filtering to obtain medical stone with surface active groups;
c. and c, adding the medical stone with surface active groups prepared in the step b into 0.1mol/L sodium hydroxide solution for soaking, filtering out solids, adding ammonium magnesium phosphate sinter and sodium bicarbonate, and performing mould pressing and drying to obtain the modified medical stone filter material for treating the ammonia nitrogen industrial wastewater.
2. The preparation method of the modified medical stone filter material for treating ammonia nitrogen industrial wastewater according to claim 1, which is characterized by comprising the following steps: in the step a, the particle size of the medical stone is 0.8-1.2 mm.
3. The preparation method of the modified medical stone filter material for treating ammonia nitrogen industrial wastewater according to claim 1, which is characterized by comprising the following steps: in the step a, the mass ratio of the medical stone to the hydrochloric acid solution is 1: 5-10.
4. The preparation method of the modified medical stone filter material for treating ammonia nitrogen industrial wastewater according to claim 1, which is characterized by comprising the following steps: in the step a, the soaking time is 1-3 h.
5. The preparation method of the modified medical stone filter material for treating ammonia nitrogen industrial wastewater according to claim 1, which is characterized by comprising the following steps: in the step b, the heating and stirring temperature is 50-90 ℃, the stirring speed is 500-600 r/min, and the time is 3-5 h.
6. The preparation method of the modified medical stone filter material for treating ammonia nitrogen industrial wastewater according to claim 1, which is characterized by comprising the following steps: in the step b, 30-40 parts by weight of medical stone, 10-20 parts by weight of carboxymethyl chitosan, 1-3 parts by weight of sodium alginate and 100 parts by weight of water.
7. The preparation method of the modified medical stone filter material for treating ammonia nitrogen industrial wastewater according to claim 1, which is characterized by comprising the following steps: in the step c, the mass ratio of the medical stone with surface active groups to the sodium hydroxide solution is 1: 5-10.
8. The preparation method of the modified medical stone filter material for treating ammonia nitrogen industrial wastewater according to claim 1, which is characterized by comprising the following steps: in the step c, the soaking time is 2-4 h.
9. The preparation method of the modified medical stone filter material for treating ammonia nitrogen industrial wastewater according to claim 1, which is characterized by comprising the following steps: in the step c, the usage amount of the magnesium ammonium phosphate sinter is 5-10% of the mass of the medical stone with surface active groups; the amount of sodium bicarbonate is 0.5-1% of the mass of Maifanitum with surface active group.
10. The modified medical stone filter material for treating ammonia nitrogen industrial wastewater, which is prepared by the method of any one of claims 1-9.
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