CN113058578A - Ammonia nitrogen adsorbent and preparation method and application thereof - Google Patents
Ammonia nitrogen adsorbent and preparation method and application thereof Download PDFInfo
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- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000003463 adsorbent Substances 0.000 title claims abstract description 78
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 77
- 239000002699 waste material Substances 0.000 claims abstract description 61
- 238000010276 construction Methods 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 239000004033 plastic Substances 0.000 claims abstract description 11
- 229920003023 plastic Polymers 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims abstract description 7
- 230000005484 gravity Effects 0.000 claims abstract description 6
- 239000002023 wood Substances 0.000 claims abstract description 5
- 239000000758 substrate Substances 0.000 claims description 24
- 239000011148 porous material Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 11
- 239000012153 distilled water Substances 0.000 claims description 6
- 230000008929 regeneration Effects 0.000 claims description 6
- 238000011069 regeneration method Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 5
- 239000011449 brick Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000002689 soil Substances 0.000 abstract description 10
- 235000015097 nutrients Nutrition 0.000 abstract description 7
- 239000001963 growth medium Substances 0.000 abstract description 3
- 230000007226 seed germination Effects 0.000 abstract description 3
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- 238000001179 sorption measurement Methods 0.000 description 41
- 239000000463 material Substances 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 230000035699 permeability Effects 0.000 description 7
- 239000002351 wastewater Substances 0.000 description 5
- DSSYKIVIOFKYAU-XCBNKYQSSA-N (R)-camphor Chemical compound C1C[C@@]2(C)C(=O)C[C@@H]1C2(C)C DSSYKIVIOFKYAU-XCBNKYQSSA-N 0.000 description 4
- 241000723346 Cinnamomum camphora Species 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
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- 229910052757 nitrogen Inorganic materials 0.000 description 4
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- 230000008569 process Effects 0.000 description 3
- 244000025254 Cannabis sativa Species 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 230000001488 breeding effect 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
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
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- 239000010451 perlite Substances 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 239000010455 vermiculite Substances 0.000 description 2
- 235000019354 vermiculite Nutrition 0.000 description 2
- 229910052902 vermiculite Inorganic materials 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
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Classifications
-
- 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
- B01J20/28014—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 form
- B01J20/28016—Particle form
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/40—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure
- A01G24/42—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure of granular or aggregated structure
-
- 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
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3021—Milling, crushing or grinding
-
- 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
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3071—Washing or leaching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
-
- 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
-
- 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
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
- B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
-
- 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 an ammonia nitrogen adsorbent and a preparation method and application thereof, wherein the ammonia nitrogen adsorbent is construction waste regenerated particles obtained by removing impurities such as wood, metal, plastic and the like from construction waste, and then crushing, screening and washing the construction waste regenerated particles. The preparation method of the ammonia nitrogen adsorbent comprises the following steps: s1: sorting the construction waste, removing impurities, and crushing by using a jaw crusher; s2: sorting the crushed construction waste by a gravity sorting machine, a bounce sorting machine and a photoelectric sorting machine to obtain construction waste particles with the particle size of 9-12 cm; s3: and crushing the sorted construction waste particles again by using a reciprocating crusher, and screening by using a mechanical reciprocating sieve. The ammonia nitrogen adsorbent disclosed by the invention can be suitable for adsorbing ammonia nitrogen pollution in water and soil, is cheap and easily available, and can be directly used as a garden seedling culture medium after ammonia nitrogen is adsorbed, and nutrients and moisture are provided for seed germination and plant growth by utilizing the adsorbed ammonia nitrogen and moisture.
Description
Technical Field
The invention belongs to the fields of ecology, environment and materials, and particularly relates to an ammonia nitrogen adsorbent, and a preparation method and application thereof.
Background
The problem of ammonia nitrogen pollution in China is common, and the increase of the content of ammonia nitrogen in the water body has great influence on the survival of aquatic plants and animals. The common ammonia nitrogen removal methods such as membrane filtration, stripping, biodegradation and the like have the problems of high cost, frequent maintenance of equipment, difficult operation, energy consumption and the like. The adsorption method has the characteristics of simplicity and environmental protection, and common adsorbents comprise biochar, zeolite and other materials. However, the cost of the materials is relatively high, the manufacturing process of the biochar is energy-consuming and difficult to recover, and the zeolite production area has limitations and relatively high cost. The adsorbent which is low in price, wide in material source, safe and environment-friendly needs to be developed.
With the acceleration of the urbanization process in China, a large amount of construction waste is generated by the massive reconstruction and dismantling of old buildings. The construction waste is firm, stable and not easy to degrade, and needs to be treated by a large-area stacking and melting field, and the treatment mode occupies a large amount of precious resources. Resource utilization of construction waste is increasingly being sought. On one hand, the construction waste is used as a regeneration building material due to large yield, low cost and certain mechanical strength, and can partially replace sandstone when being used for road bed construction. On the other hand, it has advantages such as a certain adsorption performance due to its porosity, a high specific surface area, and the like, and can be used as an adsorbent.
Along with the development of urbanization, the urban area is enlarged, and urban landscaping area is also increasing day by day, and the afforestation area that increases every year needs a large amount of planting soil and gardens matrix of growing seedlings cultivated in a pot, and urban landscaping matrix adopts the soil of digging nearby mostly, and a lot of soil are immature soil, and organic matter and nutrient element content are low, and ventilative water permeability is poor, is unfavorable for vegetation and seed germination, need higher cost and input to it improves. The seedling culture medium commonly adopted in garden and gardening industry comprises grass peat, vermiculite, perlite and the like, the grass peat contains more nutrient elements and has better air permeability, certain hydrophobicity, poor water retention and higher cost, and the vermiculite and the perlite have better air permeability and water permeability but are deficient in the nutrient elements, so that the nutrient elements are required to be additionally added, and the cost is higher.
Generally, the ammonia nitrogen wastewater removal needs a cheap and easily available material, the building waste consumption needs an environment-friendly and low-cost method, and the garden and gardening industry needs a cheap and easily available seedling culture and cultivation medium.
Disclosure of Invention
Aiming at the technical problems, the invention provides an ammonia nitrogen adsorbent and a preparation method and application thereof, the ammonia nitrogen adsorbent is crushed construction waste regeneration particles, is suitable for adsorption of ammonia nitrogen pollution in water and soil, is a cheap and easily-obtained material, can be directly used as a garden seedling culture medium after adsorbing ammonia nitrogen, and provides nutrients and moisture for seed germination and plant production by using the ammonia nitrogen and moisture adsorbed by the adsorbent.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the ammonia nitrogen adsorbent is construction waste regenerated particles obtained by removing impurities such as wood, metal and plastic from construction waste, and then crushing, screening and washing the construction waste.
The invention also provides a preparation method of the ammonia nitrogen adsorbent, which comprises the following steps:
s1: sorting the construction waste, selecting impurities such as metal, plastic, wood and the like, and crushing by using a jaw crusher;
s2: sorting the construction waste crushed in the step S1 by a gravity sorting machine, a bounce sorting machine and a photoelectric sorting machine to obtain construction waste particles with the particle size of 0-12 cm;
s3: and (2) crushing the construction waste particles sorted in the step (S2) again by using a reciprocating crusher, then sequentially screening by using mechanical reciprocating sieves with 10mm, 5mm, 3mm and 2mm sieve pores, taking the construction waste particles intercepted on a 5mm sieve pore as 5-10mm, taking the construction waste particles intercepted on a 3mm sieve pore as 3-5mm, taking the construction waste particles intercepted on a 2mm sieve pore as 2-3mm, and taking the construction waste particles sieved off a 2mm sieve pore as 0-2 mm.
Preferably, it further comprises S4: washing the screened construction waste particles with water, removing impurities such as wood residues and plastics, soaking the construction waste particles in distilled water for 2 to 2.5 hours, pouring the distilled water, placing the construction waste particles in an oven, and drying the construction waste particles at the temperature of 100 ℃ and 110 ℃ for 8 to 8.5 hours to obtain the ammonia nitrogen adsorbent.
Preferably, the step S2 is to sort the light components and impurities in the construction waste crushed in the step S1 by a gravity sorter, a bounce sorter and a photoelectric sorter to obtain construction waste particles with the main components of concrete particles, red brick particles and tile particles and the particle diameter of 9-12 cm.
The invention also provides application of the ammonia nitrogen adsorbent in preparation of the garden seedling substrate, wherein the ammonia nitrogen adsorbent is used as the garden seedling substrate after adsorbing ammonia nitrogen.
Preferably, the adsorbent after adsorbing the ammonia nitrogen is used as a seedling substrate and is placed in a flowerpot, the thickness of the substrate is 20cm, plant seeds are placed in the substrate, then the substrate with the thickness of 2cm is covered, and then water is sprayed on the surface of the substrate.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
the construction waste particles are used as ammonia nitrogen adsorbents, construction waste regeneration particles are obtained through crushing, screening, washing and soaking, the construction waste regeneration particles are mixed with ammonia nitrogen wastewater to adsorb ammonia nitrogen in water, and the adsorbed construction waste regeneration particles are used as garden seedling raising matrixes, so that the garden seedling raising matrixes are good in air permeability and water permeability, high in nutrient element content and good in breeding effect. The invention simultaneously solves the problems of disposal of construction waste and removal of ammonia nitrogen in water, provides a cheap and easily-obtained substrate for garden breeding, and is convenient and easy to operate.
The ammonia nitrogen adsorbent can be used for adsorbing and removing various pollutants, repairing soil in situ, modifying different pollutants and conditions in water and soil, adjusting according to local conditions, overcoming the defects of various technologies, and having the advantages of simple operation, high efficiency and low cost.
The adsorbent and the use method thereof can not cause secondary pollution to the surrounding environment, underground water and soil, and can better ensure ecological safety and health.
The adsorbent and the matrix used in the invention have wide sources, simple preparation process, low price and environmental protection, and can be repeatedly utilized, thereby realizing the resource utilization of waste.
Drawings
FIG. 1 is a flow chart of the preparation of ammonia nitrogen adsorbent of example 1 of the present invention;
FIG. 2 is an SEM picture of the surface of red brick particles in the ammonia nitrogen adsorbent of example 1;
FIG. 3 is an SEM picture of the surface of concrete particles in the ammonia nitrogen adsorbent in example 1
Fig. 4 is an SEM picture of the surface of ceramic tile particles in the ammonia nitrogen adsorbent of example 1;
FIG. 5 is a nitrogen isothermal adsorption line for the ammonia nitrogen adsorbent of example 1;
fig. 6 is the BJH pore size distribution of the ammonia nitrogen adsorbent in example 1;
fig. 7 is a schematic view of a dynamic adsorption unit of the ammonia nitrogen adsorbent.
Description of reference numerals: 1-an adsorption column; 2-filtering the screen; 3-filter paper; 4-a water tank; 5-a metering pump; 6-water outlet; 7-nozzle.
Detailed Description
The ammonia nitrogen adsorbent, the preparation method and the application thereof provided by the invention are further described in detail with reference to the accompanying drawings and specific examples. Advantages and features of the present invention will become apparent from the following description and from the claims.
Example 1
Preparation of Ammonia Nitrogen adsorbent, see FIG. 1
S1: sorting large building garbage, and selecting sundries such as metal, plastic, wood and the like;
s2: crushing the sorted large building garbage by using a jaw crusher to obtain crushed materials with the particle size of about 0-12 cm;
s3: removing metal, light components and impurities in the crushed materials by a gravity separator, a bounce separator and a photoelectric separator;
crushing the sorted construction waste again by using a reciprocating crusher to obtain construction waste particles of about 10mm, then sequentially sieving the construction waste particles by using mechanical reciprocating sieves with sieve pores of 10mm, 5mm, 3mm and 2mm, and taking the construction waste particles intercepted on a sieve with the diameter of 5-10 mm; taking the intercepted construction waste particles with the particle size of 3-5mm on 3 mm; taking construction waste particles intercepted on a 2mm screen, wherein the particle size is 2-3 mm; taking construction waste particles with the particle size of 0-2mm below a sieve with the particle size of 2 mm;
s4: washing the construction waste particles with different particle sizes by using tap water, then putting the construction waste particles into a plastic box to be soaked by using the tap water, fishing out impurities such as wood residues, plastics and the like in the water, fishing out the construction waste particles, soaking the construction waste particles in distilled water for 2 hours to remove water-soluble salt, pouring out the distilled water, and drying the construction waste particles by using an oven, wherein the obtained particles are ammonia nitrogen adsorbent.
The heavy metal content of the obtained ammonia nitrogen adsorbent is measured, the measurement result is shown in table 1, and the heavy metal content shown in table 1 does not exceed the grade B standard of the exhibition land soil environment quality evaluation standard.
TABLE 1 adsorbent heavy metals content (mg/kg)
Fig. 2 to 4 are SEM pictures of the surface of the ammonia nitrogen adsorbent, fig. 2 is an SEM picture of the surface of red brick particles, fig. 3 is an SEM picture of the surface of concrete particles, and fig. 4 is an SEM picture of the surface of tile particles, respectively. From the SEM picture, it can be seen that the ammonia nitrogen adsorbent has a rough surface and contains a large amount of pores, and the element content of the surface is analyzed in combination with EDS, and the results are shown in table 1,
TABLE 2 EDS quantitative analysis result of ammonia nitrogen adsorbent (w/%)
The prepared ammonia nitrogen adsorbent was subjected to nitrogen adsorption to measure the pore volume (fig. 5) and the specific surface area (fig. 6), thereby obtaining the nitrogen isothermal adsorption line of the ammonia nitrogen adsorbent shown in fig. 5 and the BJH pore size distribution of the ammonia nitrogen adsorbent shown in fig. 6. It can be seen that the adsorbent has wide pore size distribution range, is a double-model pore size distribution containing both mesopores and macropores, the nitrogen adsorption isotherm of the adsorbent is an IV-type adsorption isotherm, and an obvious H3-type hysteresis loop is arranged at a position of 0.4-0.5 of relative partial pressure (P/PO), which is a typical characteristic of mesopores, and meanwhile, the adsorption isotherm is steeper near saturated vapor pressure, which is caused by multilayer adsorption in the macropores. As can be seen from FIG. 5, the pore size of the adsorbent is more concentrated in the range of 74.7266 nm-918.4330 nm, and the most probable pore size is 237.0439 nm.
And comparing the specific surface areas before and after ammonia nitrogen adsorption, wherein the results are shown in Table 3, the BET analysis result is shown in Table 3, and the BET and BJH specific surface areas of the adsorbent after ammonia nitrogen adsorption are 8.8493m respectively2G and 9.6070m2The specific surface areas of the two materials are respectively reduced by 12.0994 percent and 25.2374 percent, and the pore volume of the BJH material is 0.0245cm3(g and 0.0229 cm)3The decrease is 6.4519%. In conclusion, the adsorbent has better adsorption performance.
TABLE 3 comparison of BET values of adsorbents before and after ammonia nitrogen adsorption
Example 2
And pouring the adsorbent after adsorbing the ammonia nitrogen solution into a plastic seedling culture flowerpot as a seedling culture substrate.
The seedling-raising flowerpot adopts a plastic flowerpot with the height of 30cm and the diameter of 40cm, the thickness of the substrate is 20cm, the cinnamomum camphora seeds are uniformly distributed in the substrate, the interval between every two seeds is 2cm, the cinnamomum camphora seeds are covered by the substrate with the thickness of 2cm after being distributed, 200ml of water is uniformly sprayed on the surface of the substrate, the germination rate of the cinnamomum camphora exceeds 80% after 10 days at the temperature of 25 ℃, and the late growth of the cinnamomum camphora is good.
Can be used as a seedling raising substrate and a planting substrate of other plants under the condition of not changing the substrate material.
Matching device
For static water environment, the ammonia nitrogen adsorbent is filled in the conical flask and can be replaced by other containers, and the other containers can be used for random oscillation and stirring, so that the probability of contacting ammonia nitrogen with the adsorbent is increased, the adsorption efficiency is improved, and the adsorbent is convenient to recycle.
In a dynamic water environment, filling ammonia nitrogen adsorbents into adsorption columns 1 shown in figure 7, respectively filling ammonia nitrogen adsorbents with different particle sizes into each adsorption column 1, wherein each adsorption column 1 is filled with one ammonia nitrogen adsorbent with a particle size, the bottom of each adsorption column is provided with a filter screen 2 and filter paper 3 to intercept the ammonia nitrogen adsorbents, each adsorption column 1 is respectively provided with a nozzle 7, the nozzle is connected with a water tank 4, the water tank 4 is filled with ammonia nitrogen sewage, a water pipe of the water tank 4 connected with the nozzle 7 is provided with a metering pump 5, and the ammonia nitrogen wastewater is dispersed into the adsorption columns 1 through the nozzles 7 on the adsorption columns 1 to be mixed with the ammonia nitrogen adsorbents for adsorption; the wastewater after passing through the ammonia nitrogen adsorbent flows out from the water outlet 6.
Simulation discussion of adsorption process of ammonia nitrogen adsorbent
1. Weighing 1g of 4 adsorbents with different particle sizes in a 150mL triangular flask respectively.
30mL of ammonia nitrogen solutions with mass concentrations of 2mg/L, 3mg/L, 4mg/L, 5mg/L and 6mg/L are respectively added into the bottles, the bottles are plugged and sealed, then the bottles are placed in a constant-temperature water bath at 25 ℃ and vibrated at the frequency of 150r/min, and after 24 hours, the solution is taken by a needle syringe and is filtered through a 0.45-micrometer filter membrane to determine the equilibrium concentration of the solution.
The ammonia nitrogen adsorption amount of the adsorbent with the particle size of 0-2mm, 2-3mm, 3-5mm and 5-10mm is respectively measured to be 0.0118mg/g, 0.0153mg/g, 0.0143mg/g and 0.0151mg/g which are very close to the results of the fitting of a quasi-second order kinetic model, namely 0.0126mg/g, 0.0154mg/g, 0.0146mg/g and 0.0152mg/g, and the quasi-second order kinetic equation can simulate the ammonia nitrogen adsorption process of the regenerated particles more accurately.
2. Weighing 1g of 4 adsorbents with different particle sizes in a 150mL triangular flask respectively.
30mL of ammonia nitrogen solutions with mass concentrations of 2mg/L, 3mg/L, 4mg/L, 5mg/L and 6mg/L are respectively added into the bottles, the bottles are plugged and sealed, then the bottles are placed in a constant-temperature water bath at 25 ℃ and vibrated at the frequency of 150r/min, and after 24 hours, the solution is taken by a needle syringe and is filtered through a 0.45-micrometer filter membrane to determine the equilibrium concentration of the solution.
The theoretical adsorption amounts of the 4 particle diameters were 0.1391mg/g, 0.1420mg/g, 0.1366mg/g and 0.1202mg/g, respectively, which were similar to the measured values of 0.1169mg/g, 0.1213mg/g, 0.1200mg/g and 0.1182mg/g, respectively, by Langmuir isothermal adsorption model fitting.
3. Respectively weighing 100g of 4 adsorbents with different particle sizes in a 250mL triangular flask, respectively adding 150mL of solution with pH values of 2, 4, 6, 7 and 9 and ammonia nitrogen mass concentration of 10mg/L into the flask, plugging and sealing the triangular flask, and placing the triangular flask in a constant-temperature water bath with frequency of 150r/min at 25 ℃.
After 24h of adsorption, the liquid is filtered through a 0.45 mu m filter membrane, and the ammonia nitrogen content in the solution is measured. Finally, the pH value of the solution with the maximum ammonia nitrogen adsorption rate of the adsorbent is 6-7.
4. Respectively weighing 4 adsorbents with different particle sizes in a 250mL triangular flask, and respectively adding 150mL NH4Cl + NaCl solution, NaCl molar concentration of 0.001mol/L, 0.0025mol/L, 0.005mol/L, 0.01mol/L and 0.05mol/L respectively, ammonia nitrogen concentration of 10 mg/L.
The triangular flask is plugged and sealed, then is placed in a constant temperature water bath with the frequency of 150r/min at the temperature of 25 ℃, and after 24 hours, the solution is taken and filtered through a filter membrane with the diameter of 0.45 mu m to measure the content of ammonia nitrogen in the solution. The results show that Na is accompanied by+Increase in concentration, NH4 +A slight decrease in adsorption rate occurred. Shows Na+And NH4 +Relative concentration of the adsorbent to NH4 +The adsorption rate of (a) is not greatly affected.
5. The dynamic adsorption experiment is carried out by adopting the device shown in figure 7, ammonia nitrogen wastewater with the mass concentration of 10mg/L is prepared in the water tank, and the water flow of the nozzle is maintained at 70 mL/min.
2kg of adsorbents with different particle sizes are respectively added into 4 adsorption columns, and a layer of qualitative filter paper is paved at the bottom of the columns to prevent the adsorbents from losing. Recording the water outlet time of each adsorption column after the nozzle starts, and taking 50mL of water sample from the water outlet at 5 th, 10 th, 15 th, 30 th, 45 th, 60 th, 90 th and 120 th min after the water outlet starts respectively to determine the ammonia nitrogen concentration.
The water outlet time of the 4 adsorption columns is 228s, 87s, 85s and 60s respectively. The adsorption equilibrium of 0-2mm, 2-3mm and 3-5mm is approached in 60min, and the change is small. 5-10mm tends to balance in about 30min, the smaller the particle size is, the better the interception of runoff is, and the ammonia nitrogen adsorption rate is higher; the large-particle adsorbent has better permeability, weaker interception capability on runoff and lower adsorption rate.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (8)
1. The ammonia nitrogen adsorbent is a construction waste regeneration particle which is obtained by removing impurities from construction waste, crushing, screening and washing, wherein the impurities are wood, metal and plastic.
2. The preparation method of the ammonia nitrogen adsorbent is characterized by comprising the following steps:
s1: sorting the construction waste, removing impurities, and crushing by using a jaw crusher;
s2: sorting the construction waste crushed in the step S1 by a gravity sorting machine, a bounce sorting machine and a photoelectric sorting machine to obtain construction waste particles with the particle size of 0-12 cm;
s3: and (4) crushing the construction waste particles sorted in the step (S2) again by using a reciprocating crusher, and then screening the construction waste particles by sequentially passing through mechanical reciprocating sieves with 10mm, 5mm, 3mm and 2mm sieve pores.
3. The method for preparing the ammonia nitrogen adsorbent according to claim 2, further comprising the step of S4: and washing the screened construction waste particles with water, and then soaking in distilled water and drying.
4. The method as claimed in claim 3, wherein the step S4 specifically comprises washing the screened construction waste particles with water, soaking the particles in distilled water for 2-2.5h, and drying the construction waste particles in an oven at 100-110 ℃ for 8-8.5h to obtain the ammonia nitrogen adsorbent.
5. The method for preparing the ammonia nitrogen adsorbent according to claim 2, wherein the impurities in the step S1 are metal, plastic, wood.
6. The method for preparing the ammonia nitrogen adsorbent according to claim 2, wherein the step S2 is specifically that the construction waste crushed in the step S1 is subjected to sorting of light components and impurities in the construction waste by a gravity sorting machine, a bounce sorting machine and a photoelectric sorting machine to obtain construction waste particles with the main components of concrete particles, red brick particles and tile particles with the particle size of 9-12 cm.
7. An application of an ammonia nitrogen adsorbent in preparation of a garden seedling raising substrate is characterized in that the ammonia nitrogen adsorbent is used as the garden seedling raising substrate after adsorbing ammonia nitrogen.
8. The application of the ammonia nitrogen adsorbent in preparing garden seedling raising substrates according to claim 7, wherein the adsorbent after adsorbing ammonia nitrogen is placed in a flowerpot as a seedling raising substrate, the thickness of the substrate is 20cm, plant seeds are placed in the substrate, then the substrate with the thickness of 2cm is covered, and then water is sprayed on the surface of the substrate.
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| CN115155512A (en) * | 2022-06-21 | 2022-10-11 | 上海应用技术大学 | Preparation and degradation method of tetracycline adsorbent |
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