CN108671881B - Wastewater treatment method for removing ammonia nitrogen by inorganic salt combined MAP chemical precipitation adsorption method - Google Patents
Wastewater treatment method for removing ammonia nitrogen by inorganic salt combined MAP chemical precipitation adsorption method Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
- B01J20/0292—Phosphates of compounds other than those provided for in B01J20/048
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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
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
Abstract
The invention discloses a wastewater treatment method for removing ammonia nitrogen by inorganic salt combined MAP chemical precipitation adsorption, which comprises the following steps: (1) preparing a magnesium hydroxide nano material, and grafting phosphate radicals on the surface of the magnesium hydroxide nano material to form a nano magnesium hydroxide-phosphate composite chemical adsorption material; (2) adding a nano magnesium hydroxide-phosphate composite chemical adsorption material into sewage containing ammonia nitrogen for reaction, and reducing the concentration of the ammonia nitrogen in the wastewater; (3) and further adsorbing and removing ammonia nitrogen in the ammonia nitrogen wastewater by using an inorganic salt combined MAP method, so that the ammonia nitrogen concentration is reduced to below 1 mg/L. The method is applied to a low-concentration ammonia nitrogen sewage system, effectively removes ammonia nitrogen pollutants in the sewage system, prevents the low-concentration ammonia nitrogen and magnesium phosphate from forming colloidal substances, is beneficial to the separation of the generated ammonia nitrogen pollutant sediment and water, has simple requirements on sewage treatment facilities, low required energy consumption and low cost, can be amplified in equal proportion, and has direct industrialization feasibility.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a wastewater treatment method for removing ammonia nitrogen by using an inorganic salt combined MAP chemical precipitation adsorption method.
Background
In recent years, the concept of green chemistry is deepened continuously, and the treatment of ammonia nitrogen wastewater is favored by more researchers. For high-concentration ammonia nitrogen wastewater, the existing treatment technology is mature and complete. However, for the treatment of low-concentration ammonia nitrogen wastewater, biological methods, ion exchange methods, ultrafiltration membrane methods and the like are often adopted. The existing process flow has the problems of complexity, high technical requirement, high cost and the like. Therefore, the development of a low-concentration ammonia nitrogen removal technology which is efficient, economical, simple to operate and low in cost becomes an important research field and subject.
The magnesium ammonium phosphate chemical precipitation Method (MAP) for treating high-concentration ammonia nitrogen industrial wastewater has the advantages of simple process, easy operation, stable reaction, high efficiency, recoverability and the like, can be applied to the treatment of high-concentration ammonia nitrogen wastewater such as industrial wastewater, livestock farm fecal sewage wastewater, pharmaceutical industry and the like, and for low-concentration ammonia nitrogen wastewater and slightly polluted ammonia nitrogen water, when the MAP chemical precipitation method is adopted, the magnesium ammonium phosphate is easy to form colloidal particles in the water to suspend in the water, is difficult to separate from the water under the action of gravity or during filtration separation, and cannot achieve the purpose of removing the ammonia nitrogen pollutants in the water.
Disclosure of Invention
The invention provides a wastewater treatment method for removing ammonia nitrogen by inorganic salt combined MAP chemical precipitation adsorption method, which comprises the following steps: the process for removing ammonia nitrogen pollutants in a sewage system is characterized by good selectivity, no formation of colloidal precipitate and easy filtration removal, and has the characteristics that the generated magnesium ammonium phosphate precipitate is easy to separate from a water body, so that the problems that the colloid is easy to form and the precipitate is difficult to separate when ammonia nitrogen pollutants in low-concentration ammonia nitrogen sewage are treated by a chemical precipitation method are solved. The invention applies inorganic salt to an improved MAP chemical precipitation method, applies processes of chemical adsorption, physical adsorption, ion exchange and the like to low-concentration ammonia nitrogen wastewater treatment, establishes a characteristic low-cost, energy-saving and simple equipment low-concentration ammonia nitrogen wastewater treatment process, can be applied to a low-concentration ammonia nitrogen sewage system, effectively removes ammonia nitrogen pollutants in the sewage system, prevents low-concentration ammonia nitrogen and magnesium phosphate from forming colloidal substances, and is favorable for separating the generated ammonia nitrogen pollutant precipitate from water.
The technical scheme of the invention is as follows:
the invention relates to a wastewater treatment method for removing ammonia nitrogen by inorganic salt combined with MAP chemical precipitation adsorption, which comprises the following steps:
(1) adding sodium hydroxide into a magnesium sulfate solution according to a certain ratio, transferring the solution to a high-pressure reaction kettle, reacting for a certain time at a certain temperature, filtering, washing and drying a generated product to obtain magnesium hydroxide with different shapes and different crystal forms, adding a phosphorus oxide solution into the magnesium hydroxide, transferring the solution to the high-pressure reaction kettle for reaction, filtering, washing and drying the generated product to obtain the nano magnesium hydroxide-phosphate composite chemical adsorption material;
(2) adding a nano magnesium hydroxide-phosphate composite chemical adsorption material into the ammonia nitrogen wastewater at the temperature of between 25 and 60 ℃ to react with the ammonia nitrogen wastewater so as to reduce the concentration of ammonia nitrogen in the wastewater;
(3) adding magnesium salt and phosphate into the ammonia nitrogen wastewater treated in the step (2), stirring for reaction, and removing ammonia nitrogen by adopting an MAP chemical precipitation method; adding inorganic salt into the mother liquor after ammonia nitrogen removal to adsorb sol in the ammonia nitrogen wastewater;
(4) repeating the operation of the step (3) for 1-3 times.
Preferably, in the step (1), the certain temperature is 120-200 ℃, and the molar ratio n (MgSO) of the magnesium sulfate to the sodium hydroxide is4) N (naoh) ═ 1: 0.8-1: 1.2, the reaction lasts for 2 to 8 hours.
Preferably, in the step (1), the phosphorus-oxygen compound comprises at least one of phosphoric acid, disodium hydrogen phosphate, sodium dihydrogen phosphate or monobutyl orthophosphate.
Preferably, in the step (1), after the phosphorus-oxygen compound is added, the concentration of phosphate in the solution is 0.1-1.0 mol/L.
Preferably, in the step (3), the magnesium salt includes at least one of magnesium chloride, magnesium nitrate, magnesium sulfate or magnesium acetate; the phosphate comprises at least one of sodium dihydrogen phosphate, disodium hydrogen phosphate, sodium metaphosphate and sodium polyphosphate.
Preferably, in the step (3), the inorganic salt comprises at least one of sodium fluoride, sodium carbonate, aluminum sulfate or magnesium sulfate, so that new precipitate is generated in the ammonia nitrogen wastewater.
The invention has the beneficial effects that:
the invention provides a novel technology for removing ammonia nitrogen from wastewater, which is an improvement on the technology for removing ammonia nitrogen from wastewater by using a MAP chemical precipitation method, so that the magnesium ammonium phosphate chemical precipitation is suitable for low-concentration wastewater. The chemical precipitation method of magnesium ammonium phosphate is improved by using inorganic salt. The invention has simple requirements on sewage treatment facilities, low required energy consumption and low cost, can be amplified in equal proportion and has direct industrialization feasibility.
Drawings
FIG. 1: the magnesium hydroxide prepared by the method of the invention is used for scanning electron microscope photos.
FIG. 2: the magnesium hydroxide X-ray diffraction pattern spectrogram prepared by the method is provided.
FIG. 3: the magnesium hydroxide prepared by the method of the invention is used for scanning electron microscope photos.
FIG. 4: the magnesium hydroxide X-ray diffraction pattern spectrogram prepared by the method is provided.
FIG. 5: the scanning electron microscope picture of the nano magnesium hydroxide-phosphate composite chemical adsorption material prepared by the method is shown.
FIG. 6: the nanometer magnesium hydroxide-phosphate composite chemical adsorption material prepared by the method has an X-ray diffraction pattern.
FIG. 7: the nanometer magnesium hydroxide-phosphate composite chemical adsorption material prepared by the method has an X-ray diffraction energy spectrum.
FIG. 8: the ammonia nitrogen wastewater removal performance diagram of the new process prepared by the method is provided.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the following describes in detail a wastewater treatment method for removing ammonia nitrogen by inorganic salt combined with MAP chemical precipitation adsorption provided by the present invention with reference to the accompanying drawings. According to the research of ammonia nitrogen wastewater by researchers before, in the ammonia nitrogen wastewater with the initial concentration of 50mg/L, the concentration of ammonia nitrogen in the ammonia nitrogen wastewater mother liquor treated by the traditional MAP chemical precipitation method can be as low as 15 mg/L-30 mg/L.
The invention provides a treatment method of MAP chemical precipitation ammonia nitrogen removal wastewater, which comprises the following steps: (1) preparing a magnesium hydroxide nano material, and grafting phosphate radicals on the surface of the magnesium hydroxide nano material to form a nano magnesium hydroxide-phosphate composite chemical adsorption material; (2) adding a nano magnesium hydroxide-phosphate composite chemical adsorption material into sewage containing ammonia nitrogen for reaction, and reducing the concentration of the ammonia nitrogen in the wastewater; (3) and further adsorbing and removing ammonia nitrogen in the ammonia nitrogen wastewater by using an inorganic salt combined MAP method, so that the ammonia nitrogen concentration is reduced to below 1 mg/L.
Example 1
1. 31.04g of magnesium sulfate solid is weighed, dissolved in 100mL of deionized water, and then 100mL of 100g/L sodium hydroxide solution is slowly added with stirring. And finally, diluting the generated white slurry to 300mL, transferring the diluted white slurry to a high-pressure reaction kettle, setting the reaction temperature to be 120 ℃, reacting for 4 hours, and filtering, washing and drying the generated product to obtain the magnesium hydroxide crystal.
2. And (2) adding 6g of magnesium hydroxide prepared in the step (1) into a solution containing 0.6g of disodium hydrogen phosphate dodecahydrate, transferring the solution to a high-pressure reaction kettle, setting the concentration of phosphate radicals in the solution to be 1.0mol/L, setting the reaction temperature to be 160 ℃, reacting for 2 hours, and performing suction filtration, washing and drying on a generated product to obtain the nano magnesium hydroxide-phosphate composite chemical adsorption material-low-concentration ammonia nitrogen purification adsorbent.
3. Adding 0.3g of nano magnesium hydroxide-phosphate composite chemical adsorption material into 300mL of ammonia nitrogen wastewater with the initial concentration of 50mg/L at normal temperature and normal pressure, stirring for 30min, standing for settling, and measuring the ammonia nitrogen concentration of supernatant liquid.
4. Adding 50mL of 0.1mol/L magnesium sulfate solution and 50mL of 0.1mol/L disodium hydrogen phosphate solution into the ammonia nitrogen wastewater treated by the step 3, stirring for reacting for 40min, standing for settling for 2 hours, and measuring the ammonia nitrogen concentration of the mother liquor after ammonia nitrogen removal; adding 50mL of 0.1mol/L sodium fluoride solution, stirring for 40min, standing and settling for 6 hours;
5. the operation of repeating step 4 is repeated 2 times.
The ammonia nitrogen concentration treated by the method can be reduced to 0.5 mg/L.
Example 2
1. 31.04g of magnesium sulfate solid is weighed, dissolved in 100mL of deionized water, and then 100mL of 100g/L sodium hydroxide solution is slowly added with stirring. And finally, diluting the generated white slurry to 300mL, transferring the diluted white slurry to a high-pressure reaction kettle, setting the reaction temperature to be 120 ℃, reacting for 4 hours, and filtering, washing and drying the generated product to obtain the magnesium hydroxide crystal.
2. Adding 6g of magnesium hydroxide into a solution containing 0.6g of disodium hydrogen phosphate dodecahydrate, transferring the solution to a high-pressure reaction kettle, setting the concentration of phosphate radicals in the solution to be 0.5mol/L, setting the reaction temperature to be 160 ℃, reacting for 2 hours, and carrying out suction filtration, washing and drying on a generated product to obtain the nano magnesium hydroxide-phosphate composite chemical adsorption material-low-concentration ammonia nitrogen purification adsorbent.
3. Adding 0.3g of nano magnesium hydroxide-phosphate composite chemical material into 300mL of ammonia nitrogen wastewater with the initial concentration of 50mg/L at normal temperature and normal pressure, stirring for 30min, standing for settling, and measuring the ammonia nitrogen concentration of supernatant liquid.
4. Adding magnesium sulfate solution and disodium hydrogen phosphate dodecahydrate solution with equal mass into the ammonia nitrogen wastewater treated in the third step, stirring and reacting for 40min, standing and settling for 2h, measuring the ammonia nitrogen concentration of the mother liquor after ammonia nitrogen removal, adding sodium fluoride solution, stirring for 40min, and standing and settling for 6 h;
5. the operation of repeating step 4 is repeated 2 times.
The ammonia nitrogen concentration treated by the method can be reduced to below 1 mg/L.
Example 3
1. 31.04g of magnesium sulfate solid is weighed, dissolved in 100mL of deionized water, and then 80mL of 100g/L sodium hydroxide solution is slowly added with stirring. And finally, diluting the generated white slurry to 300mL, transferring the diluted white slurry to a high-pressure reaction kettle, setting the reaction temperature to be 120 ℃, reacting for 4 hours, and filtering, washing and drying the generated product to obtain the magnesium hydroxide crystal.
2. Adding 6g of magnesium hydroxide into a solution containing 0.6g of disodium hydrogen phosphate dodecahydrate, transferring the solution to a high-pressure reaction kettle, setting the concentration of phosphate radicals in the solution to be 0.1mol/L, setting the reaction temperature to be 160 ℃, reacting for 2 hours, and carrying out suction filtration, washing and drying on a generated product to obtain the nano magnesium hydroxide-phosphate composite chemical adsorption material-low-concentration ammonia nitrogen purification adsorbent.
3. Adding 0.3g of nano magnesium hydroxide-phosphate composite chemical material into 300mL of ammonia nitrogen wastewater with the initial concentration of 50mg/L at normal temperature and normal pressure, stirring for 30min, standing for settling, and measuring the ammonia nitrogen concentration of supernatant liquid.
4. Adding magnesium sulfate solution and disodium hydrogen phosphate dodecahydrate solution with equal mass into the ammonia nitrogen wastewater treated by the step 3, stirring for reacting for 40min, standing and settling for 2h, measuring the ammonia nitrogen concentration of the mother liquor after ammonia nitrogen removal, adding sodium fluoride solution, stirring for 40min, and standing and settling for 6 h;
5. the operation of repeating step 4 is repeated 2 times.
The ammonia nitrogen concentration treated by the method can be reduced to below 1 mg/L.
Example 4
1. 31.04g of magnesium sulfate solid is weighed, dissolved in 100mL of deionized water, and then 120mL of 100g/L sodium hydroxide solution is slowly added with stirring. And finally, diluting the generated white slurry to 300mL, transferring the diluted white slurry to a high-pressure reaction kettle, setting the reaction temperature to be 120 ℃, reacting for 4 hours, and filtering, washing and drying the generated product to obtain the magnesium hydroxide crystal.
2. Adding 6g of magnesium hydroxide into a solution containing 0.6g of sodium dihydrogen phosphate dihydrate, transferring the solution into a high-pressure reaction kettle, setting the concentration of phosphate radicals in the solution to be 1.0mol/L, setting the reaction temperature to be 160 ℃, reacting for 2 hours, and carrying out suction filtration, washing and drying on a generated product to obtain the nano magnesium hydroxide-phosphate composite chemical adsorption material-low-concentration ammonia nitrogen purification adsorbent.
3. Adding 0.3g of nano magnesium hydroxide-phosphate composite chemical material into 300mL of ammonia nitrogen wastewater with the initial concentration of 50mg/L at normal temperature and normal pressure, stirring for 30min, standing for settling, and measuring the ammonia nitrogen concentration of supernatant liquid.
4. Adding magnesium sulfate solution and disodium hydrogen phosphate dodecahydrate solution with equal mass into the ammonia nitrogen wastewater treated by the step 3, stirring for reacting for 40min, standing and settling for 2h, measuring the ammonia nitrogen concentration of the mother liquor after ammonia nitrogen removal, adding sodium fluoride solution, stirring for 40min, and standing and settling for 6 h;
5. the operation of repeating step 4 is repeated 2 times.
The ammonia nitrogen concentration treated by the method can be reduced to below 1 mg/L.
Example 5
1. 31.04g of magnesium sulfate solid is weighed, dissolved in 100mL of deionized water, and then 100mL of 100g/L sodium hydroxide solution is slowly added with stirring. And finally, diluting the generated white slurry to 300mL, transferring the diluted white slurry to a high-pressure reaction kettle, setting the reaction temperature to be 120 ℃, reacting for 4 hours, and filtering, washing and drying the generated product to obtain the magnesium hydroxide crystal.
2. Adding 6g of magnesium hydroxide into a solution containing 0.6g of sodium dihydrogen phosphate dihydrate, transferring the solution into a high-pressure reaction kettle, setting the concentration of phosphate radicals in the solution to be 1.0mol/L, setting the reaction temperature to be 160 ℃, reacting for 2 hours, and carrying out suction filtration, washing and drying on a generated product to obtain the nano magnesium hydroxide-phosphate composite chemical adsorption material-low-concentration ammonia nitrogen purification adsorbent.
3. Adding 0.3g of nano magnesium hydroxide-phosphate composite chemical material into 300mL of ammonia nitrogen wastewater with the initial concentration of 50mg/L at normal temperature and normal pressure, stirring for 30min, standing for settling, and measuring the ammonia nitrogen concentration of supernatant liquid.
4. Adding magnesium sulfate solution and disodium hydrogen phosphate dodecahydrate solution with equal mass into the ammonia nitrogen wastewater treated by the step 3, stirring for reacting for 40min, standing and settling for 2h, measuring the ammonia nitrogen concentration of the mother liquor after ammonia nitrogen removal, adding sodium carbonate solution, stirring for 40min, and standing and settling for 6 h;
5. the operation of repeating step 4 is repeated 2 times.
The ammonia nitrogen concentration treated by the method can be reduced to below 1 mg/L.
Scanning electron micrographs of magnesium hydroxide (figure 1 and figure 3) prepared by the method of the invention are sheet-shaped and needle-shaped, X-ray diffraction patterns of magnesium hydroxide (figure 2 and figure 4) prepared by the method of the invention, scanning electron micrographs of magnesium hydroxide-phosphate composite material (figure 5) prepared by the method of the invention, X-ray diffraction patterns of magnesium hydroxide-phosphate composite material (figure 6) prepared by the method of the invention, X-ray diffraction energy patterns of magnesium hydroxide-phosphate composite material (figure 7) prepared by the method of the invention, and removal performance patterns of ammonia nitrogen wastewater in a new process (figure 8) prepared by the method of the invention.
Therefore, the ammonia nitrogen removal method in the method can reduce the effluent concentration to below 0.5mg/L in low-concentration ammonia nitrogen wastewater. Can effectively reduce the ammonia nitrogen concentration in the low-concentration ammonia nitrogen wastewater, and obviously reduces the ammonia nitrogen concentration of the effluent with the traditional MAP chemical precipitation method.
The present invention is not limited to the above-described examples, and any modifications and variations of the present invention are within the scope of the claims.
Claims (4)
1. A waste water treatment method for removing ammonia nitrogen by inorganic salt combined MAP chemical precipitation adsorption is characterized by comprising the following steps:
(1) adding sodium hydroxide into a magnesium sulfate solution, transferring the solution to a high-pressure reaction kettle, reacting for 2-8 h at 120-200 ℃, and filtering, washing and drying a generated product to obtain magnesium hydroxide; then adding a phosphorus-oxygen compound solution, transferring the mixture into a high-pressure reaction kettle for reaction, and performing suction filtration, washing and drying on a generated product to obtain a nano magnesium hydroxide-phosphate composite chemical adsorption material;
(2) adding a nano magnesium hydroxide-phosphate composite chemical adsorption material into the ammonia nitrogen wastewater at the temperature of between 25 and 60 ℃ to react with the ammonia nitrogen wastewater so as to reduce the concentration of ammonia nitrogen in the wastewater;
(3) adding magnesium salt and phosphate into the ammonia nitrogen wastewater treated in the step (2), stirring for reaction, taking the mother liquor after ammonia nitrogen removal, and adding inorganic salt to adsorb sol in the ammonia nitrogen wastewater;
(4) repeating the operation of the step (3) for 1-3 times;
in the step (1), the phosphorus-oxygen compound comprises at least one of phosphoric acid, disodium hydrogen phosphate, sodium dihydrogen phosphate or monobutyl orthophosphate;
in the step (3), the inorganic salt includes at least one of sodium fluoride, sodium carbonate, aluminum sulfate, or magnesium sulfate.
2. The method for treating wastewater by removing ammonia nitrogen through inorganic salt combined MAP chemical precipitation adsorption according to claim 1, wherein in the step (1), the molar ratio of magnesium sulfate to sodium hydroxide is 1: 0.8-1: 1.2.
3. the method for treating wastewater by removing ammonia nitrogen through inorganic salt combined MAP chemical precipitation adsorption according to claim 1, wherein in the step (1), after the phosphorus-oxygen compound is added, the concentration of phosphate radical in the solution is 0.1-1.0 mol/L.
4. The method for treating wastewater by removing ammonia nitrogen through combination of inorganic salt and MAP chemical precipitation adsorption according to claim 3, wherein in the step (3), the magnesium salt comprises at least one of magnesium chloride, magnesium nitrate, magnesium sulfate or magnesium acetate; the phosphate comprises at least one of sodium dihydrogen phosphate, disodium hydrogen phosphate, sodium metaphosphate and sodium polyphosphate.
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| WO2002088674A3 (en) * | 2001-04-27 | 2003-03-27 | Uop Llc | Adsorptive method for determining a surface property of a solid |
| WO2005019102A1 (en) * | 2003-08-22 | 2005-03-03 | National Institute For Materials Science | Porous and spherical calcium phosphate particle being partly substituted with metal ion or having metal ion carried on surface thereof, and porous multiayer calcium phosphate particle |
| CN101555076A (en) * | 2008-04-11 | 2009-10-14 | 中国科学院广州地球化学研究所 | Ammonian remover used for treating highly concentrated ammonian wastewater and treatment method |
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