CN112844303A - Water purification sludge/sodium silicate composite adsorbent, preparation method thereof and application thereof in treating ammonia nitrogen in water body - Google Patents
Water purification sludge/sodium silicate composite adsorbent, preparation method thereof and application thereof in treating ammonia nitrogen in water body Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 239000010802 sludge Substances 0.000 title claims abstract description 106
- 239000004115 Sodium Silicate Substances 0.000 title claims abstract description 74
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910052911 sodium silicate Inorganic materials 0.000 title claims abstract description 74
- 238000000746 purification Methods 0.000 title claims abstract description 52
- 239000003463 adsorbent Substances 0.000 title claims abstract description 49
- 239000002131 composite material Substances 0.000 title claims abstract description 38
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000008213 purified water Substances 0.000 claims abstract description 38
- 239000011246 composite particle Substances 0.000 claims abstract description 17
- 239000007864 aqueous solution Substances 0.000 claims abstract description 15
- 239000002244 precipitate Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 9
- 230000007935 neutral effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 9
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- 238000005516 engineering process Methods 0.000 abstract description 4
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- 239000010865 sewage Substances 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 description 12
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003837 high-temperature calcination Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 208000003141 Plant Poisoning Diseases 0.000 description 1
- 229910020489 SiO3 Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
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- 230000006866 deterioration Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 231100000915 pathological change Toxicity 0.000 description 1
- 230000036285 pathological change Effects 0.000 description 1
- 239000003123 plant toxin Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
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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
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28057—Surface area, e.g. B.E.T specific surface area
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Water Treatment By Sorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention belongs to a sewage treatment technology, and particularly relates to a water purification sludge/sodium silicate composite adsorbent, a preparation method thereof and application thereof in treating ammonia nitrogen in a water body. Mixing powdered purified water sludge and a sodium silicate aqueous solution, standing to obtain a precipitate, washing the precipitate to be neutral, and granulating to obtain purified water sludge/sodium silicate composite particles; and drying and roasting the water purification sludge/sodium silicate composite particles to obtain the water purification sludge/sodium silicate composite adsorbent. The invention carries out resource utilization on the purified water sludge, not only can solve the pollution problem caused by the purified water sludge, but also can save the cost and generate economic benefit, thereby having good prospect.
Description
Technical Field
The invention belongs to a sewage treatment technology, and particularly relates to a water purification sludge/sodium silicate composite adsorbent, a preparation method thereof and application thereof in removing ammonia nitrogen in water.
Background
Ammonia nitrogen is one of main oxygen consuming pollutants in a water body, and when household or industrial wastewater which is not treated properly and contains excessive ammonia nitrogen is discharged into a river, problems of water body eutrophication and water quality deterioration are often caused. In addition, the excessively fertilized farmland causes ammonia nitrogen to leak into an underground water system under the action of rainwater, and serious damage is caused to an aquatic ecosystem. In addition, the ammonia nitrogen is nitrified to form nitrate, and when the concentration of the nitrite exceeds 10 mg ∙ L-1Is harmful to human health. Meanwhile, the increase of the ammonia nitrogen content in the water can also cause the growth of algae and bacteria, further consume the dissolved oxygen in the water and make the water body turn black and become smelly.
The purified water sludge is a byproduct generated in the sedimentation and filtration washing processes of the water treatment plants, the purified water sludge generated from the water treatment plants is increasing every year, the yield is huge, if the purified water sludge is not treated properly, the direct discharge or the landfill of the purified water sludge wastes useful resources in the purified water sludge, and new pollution is caused to the environment. As the production of clean water sludge increases and the associated environmental standards become more stringent, the disposal of clean water sludge has become an increasingly more challenging task.
The early treatment of the water purification sludge mainly comprises direct discharge and landfill, which not only causes the rising of the riverbed in the discharge area and the blockage of the riverway, but also causes animal and plant poisoning and death due to aluminum salt and some heavy metal particles, causes pathological changes in human body due to enrichment, influences human survival and causes long-term pollution and destruction to the ecological environment. Along with the aggravation of environmental pollution and the implementation of relevant environmental protection policies, considerable attention is paid to the treatment of the water purification sludge at home and abroad. At present, the water purification sludge is mainly treated in a harmless way, and resource utilization becomes a main trend of current research on the basis.
At present, the emphasis is placed on how to recycle the purified water sludge at home and abroad. The water purification sludge is recycled, the pollution problem caused by the water purification sludge can be solved, the cost can be saved, the economic benefit is generated, and the water purification sludge recycling method has a good prospect. The current research on water purification sludge mainly focuses on the adsorption performance of toxic substances in water.
Disclosure of Invention
The invention adopts the following technical scheme:
the preparation method of the water purification sludge/sodium silicate composite adsorbent comprises the following steps of mixing powdery water purification sludge and a sodium silicate aqueous solution, standing to obtain a precipitate, washing the precipitate to be neutral, and granulating to obtain water purification sludge/sodium silicate composite particles; and drying and roasting the water purification sludge/sodium silicate composite particles to obtain the water purification sludge/sodium silicate composite adsorbent.
The method for treating the ammonia nitrogen water body comprises the following steps of mixing powdered purified water sludge and a sodium silicate aqueous solution, standing to obtain a precipitate, washing the precipitate to be neutral, and granulating to obtain purified water sludge/sodium silicate composite particles; drying and roasting the water purification sludge/sodium silicate composite particles to obtain a water purification sludge/sodium silicate composite adsorbent; adding the purified water sludge/sodium silicate composite adsorbent into the ammonia nitrogen-containing water body to complete the treatment of the ammonia nitrogen-containing water body.
The water purification sludge/sodium silicate composite adsorbent disclosed by the invention has the advantages that in the adsorption process, surface adsorption, ion adsorption and surface particle coordination reaction are simultaneously carried out, particularly, the porosity is increased after high-temperature roasting, and the adsorption capacity is stronger. Therefore, the invention discloses the application of the water purification sludge/sodium silicate composite adsorbent in treating ammonia nitrogen in water.
In the invention, the dosage ratio of the powdery clean water sludge to the sodium silicate aqueous solution is 1 g: 25 mL; the mass concentration of the sodium silicate aqueous solution is 0.5-12%, preferably 5-10%.
In the invention, the mixing is performed by oscillating and mixing for 1.5-2.5 h at normal temperature, and the specific oscillation is a conventional technology, so that materials can be mixed; the roasting temperature is 200-500 ℃, and preferably 300-400 ℃; the time is 3 to 5 hours, preferably 4 hours.
In the invention, the particle size of the powdery clean water sludge is 100-200 meshes.
In the invention, when the ammonia nitrogen water body is treated, the dosage ratio of the water purification sludge/sodium silicate composite adsorbent to the ammonia nitrogen-containing water body is (10-40) g: 1L; preferably (20-30) g: 1L.
The water purification sludge/sodium silicate composite adsorbent contains SiO2And Al2O3Has a lamellar structure and has good adsorption effect on ammonia nitrogen. In addition, the lamellar structure of the water purification sludge is looser after high-temperature roasting, the porosity is increased, the specific surface area is enlarged, and the adsorption is favorably carried out; modified by sodium silicate, Na+Replaces Ca with larger atomic radius in the water purification sludge2+And K+Has smaller steric hindrance, thereby leading the water-purifying sludge modified by sodium silicate to be NH4 +The amount of adsorption of (3) increases.
Drawings
FIG. 1 is a photograph of a purified water sludge/sodium silicate composite adsorbent;
FIG. 2 is an XRD spectrum of a purified water sludge adsorbent and a purified water sludge/sodium silicate composite adsorbent;
fig. 3 is SEM images of purified water sludge adsorbent (a) and purified water sludge/sodium silicate composite adsorbent (b).
Detailed Description
The preparation method of the water purification sludge/sodium silicate composite adsorbent comprises the following steps of mixing powdery water purification sludge and a sodium silicate aqueous solution, standing to obtain a precipitate, washing the precipitate to be neutral, and granulating to obtain water purification sludge/sodium silicate composite particles; and drying and roasting the water purification sludge/sodium silicate composite particles to obtain the water purification sludge/sodium silicate composite adsorbent.
The method for treating the ammonia nitrogen water body comprises the following steps of mixing powdered purified water sludge and a sodium silicate aqueous solution, standing to obtain a precipitate, washing the precipitate to be neutral, and granulating to obtain purified water sludge/sodium silicate composite particles; drying and roasting the water purification sludge/sodium silicate composite particles to obtain a water purification sludge/sodium silicate composite adsorbent; adding the purified water sludge/sodium silicate composite adsorbent into the ammonia nitrogen water body to complete the treatment of the ammonia nitrogen water body; obtained para-NH4 +The adsorption capacity and the adsorption rate of (A) are equal to those of three parallel experimentsMean value (error meets the requirements)
Clean water sludge (existing raw material) from a water plant is dried for 24 hours at 100 ℃, then crushed by a crusher, and particles with the particle size of 100-200 meshes are taken as powdery clean water sludge and are used in the following examples and comparative examples. The invention only uses water-purifying sludge and sodium silicate (Na)2SiO3·9H2O) is used as a raw material, and other raw materials are not needed, and the water purification sludge/sodium silicate composite adsorbent is obtained through mixing, granulation, drying and roasting, and has a good ammonia nitrogen treatment effect. The raw materials of the invention are conventional products, the specific operation method and the test method are conventional technologies, and the oscillation and the calcination are carried out in the conventional air environment.
Examples
Adding 100 g of the powdery clean water sludge into 2500 mL of sodium silicate aqueous solutions with different mass concentrations, and conventionally oscillating for 2 h at normal temperature; standing and settling, sucking out supernatant, washing the lower precipitate with distilled water to neutrality (pH value neutrality), and conventionally extruding and molding in a pelletizer to obtain purified water sludge/sodium silicate composite particles; then drying the purified sludge/sodium silicate composite particles at 105 ℃, and then putting the dried purified sludge/sodium silicate composite particles into a muffle furnace to be roasted for 4 hours at different temperatures (the temperature is raised from room temperature to roasting temperature at the heating rate of 16 ℃/min, and then the temperature is kept for 4 hours in an air environment) to prepare the purified sludge/sodium silicate composite adsorbent, wherein a physical photograph is shown in figure 1, and the brown color is obtained after roasting; table 1 shows the parameters of the examples and the ammonia nitrogen treatment results.
Comparative example
Extruding and molding the powdery purified water sludge by using a granulator (adding water conventionally, which is common sense of granulation) to obtain purified water sludge particles; then drying the purified water sludge particles at 105 ℃, and then putting the dried purified water sludge particles into a muffle furnace to be roasted for 4 hours at 350 ℃ (the temperature is raised from room temperature to 350 ℃ at the heating rate of 16 ℃/min, and then the temperature is kept for 4 hours, and the purified water sludge adsorbent is prepared in an air environment); table 1 shows the parameters of the examples and the results of ammonia nitrogen treatment, which are shown in the seventh group.
Preparation of ammonia nitrogen simulation water sample
Using 50 mg ∙ L-1The ammonium chloride aqueous solution to simulate actual wastewater; spectroscopy with Nassner reagentAnd (4) measuring the concentration of ammonia nitrogen by a photometric method. Sequentially and respectively weighing 1g of adsorbent, placing the adsorbent into different conical flasks, then respectively adding 50 mL of previously prepared ammonia nitrogen simulation water sample, oscillating the conical flasks at normal temperature for 12 h (oscillation rate of 120 r/min), standing, absorbing 5mL of centrifugal liquid by using a disposable dropper, taking 1 mL of supernatant liquid for absorbance determination, and calculating the ratio of the adsorbent to NH under different modification conditions4 +The results of the adsorption amount (c) are shown in Table 1.
Using 50 mg ∙ L-1The ammonium chloride aqueous solution to simulate actual wastewater; and (4) measuring the concentration of the ammonia nitrogen by using a nano-reagent-spectrophotometry. Weighing 1.5 g of group 6 water purification sludge/sodium silicate composite adsorbent (calcined at 5% and 400 ℃), putting the adsorbent into a conical flask, then adding 50 mL of previously prepared ammonia nitrogen simulation water sample, oscillating the conical flask at normal temperature for 12 h (oscillation rate of 120 r/min), standing the conical flask, absorbing about 5mL of centrifugal water by using a disposable dropper, taking 1 mL of supernatant for absorbance determination, and calculating NH of modified water purification sludge under the condition of different adsorbent dosages4 +The removal rate of (3) was 95.1%; 1g of group 6 purified water sludge/sodium silicate composite adsorbent (calcined at 5% and 400 ℃) to NH4 +The removal rate of (a) was 91.6%; 0.5g of group 6 purified water sludge/sodium silicate composite adsorbent (calcined at 5%, 400 ℃) to NH4 +The removal rate of (3) was 67.5%.
The purified water sludge/sodium silicate composite adsorbent of the present invention examples (groups 1 to 6) were compared to NH using the existing commercially available 20-60 mesh zeolite adsorbents of this subject group4 +The removal rate of the adsorbent is obviously better than that of the commercially available zeolite adsorbent with 20 meshes to 60 meshes.
As can be seen from FIG. 2, the purified water sludge/sodium silicate composite adsorbent (group one) comprises SiO2And Al2O3And (5) structure. The oxygen atoms in the crystal structure of the purified water sludge are not saturated yet and thus have negative charges for NH4 +Generating electrostatic attraction; through silicic acidAfter sodium modification, Na+Replaces Ca with larger atomic radius in the water purification sludge2+And K+Has smaller steric hindrance, thereby leading the water-purifying sludge modified by sodium silicate to be NH4 +The amount of adsorption of (3) increases.
As can be seen from FIG. 3, the purified water sludge originally has a compact sheet structure and is alternately laminated. After high-temperature calcination, the compact lamellar structure of the purified water sludge is obviously destroyed, the structure is loose and larger pores are generated, because the purified water sludge volatilizes water and reduces organic matters to form pores after high-temperature calcination. The flat layer structure of the water purification sludge (group I) modified by the sodium silicate is looser, and the pores are enlarged because of Na in the sodium silicate+Exchanging with metal active sites in the water purification sludge, Na+The atomic radius of the silicon dioxide is smaller, so that larger pores are formed, and the original lattice structure is damaged, so that the flat-layer structure is looser.
Claims (10)
1. The preparation method of the water purification sludge/sodium silicate composite adsorbent is characterized by comprising the following steps of mixing powdery water purification sludge and a sodium silicate aqueous solution, standing to obtain a precipitate, washing the precipitate to be neutral, and granulating to obtain water purification sludge/sodium silicate composite particles; and drying and roasting the water purification sludge/sodium silicate composite particles to obtain the water purification sludge/sodium silicate composite adsorbent.
2. The water-purifying sludge/sodium silicate composite adsorbent of claim 1, wherein the dosage ratio of the powdered water-purifying sludge to the sodium silicate aqueous solution is 1 g: 25 mL.
3. The water purification sludge/sodium silicate composite adsorbent as claimed in claim 1, wherein the mass concentration of the sodium silicate aqueous solution is 0.5-12%.
4. The water purification sludge/sodium silicate composite adsorbent as claimed in claim 1, wherein the mass concentration of the sodium silicate aqueous solution is 5-10%.
5. The water purification sludge/sodium silicate composite adsorbent as claimed in claim 1, wherein the mixing is performed by shaking at normal temperature for 1.5-2.5 h.
6. The water purification sludge/sodium silicate composite adsorbent of claim 1, wherein the roasting temperature is 200-500 ℃ and the roasting time is 3-5 hours.
7. A method for treating ammonia nitrogen water is characterized by comprising the following steps of mixing powdered purified water sludge and a sodium silicate aqueous solution, standing to obtain a precipitate, washing the precipitate to be neutral, and granulating to obtain purified water sludge/sodium silicate composite particles; drying and roasting the water purification sludge/sodium silicate composite particles to obtain a water purification sludge/sodium silicate composite adsorbent; adding the purified water sludge/sodium silicate composite adsorbent into the ammonia nitrogen-containing water body to complete the treatment of the ammonia nitrogen-containing water body.
8. The method for treating the ammonia nitrogen water body according to claim 7, wherein the particle size of the powdery clean water sludge is 100-200 meshes.
9. The method for treating the ammonia nitrogen water body according to claim 7, wherein the dosage ratio of the water purification sludge/sodium silicate composite adsorbent to the ammonia nitrogen-containing water body is (10-40) g: 1L when the ammonia nitrogen water body is treated.
10. The use of the water purification sludge/sodium silicate composite adsorbent of claim 1 for treating ammonia nitrogen in a water body.
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| CN115155545A (en) * | 2022-06-24 | 2022-10-11 | 中国水产科学研究院珠江水产研究所 | Porous material for reducing ammonia nitrogen in pond culture tail water and preparation method thereof |
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