KR102075232B1 - Manufacturing method of nano-metal biochar for removing phosphorus and nano-metal biochar manufactured using the method - Google Patents

Abstract

The present invention relates to a seaweed bio-tea manufacturing method that can remove phosphorus from the sewage, and to a method for producing a bio- tea by modifying the surface of the bio- tea with nano-metal in order to increase the phosphorus adsorption performance of the seaweed bio-tea.
According to a feature of the present invention for achieving the above object, the present invention method for producing a phosphorus-removed nano-metal bio-tea is a first step of removing salts by soaking seaweed in distilled water for 2 to 2.5 hours; A second step of drying the algae indoors; A third step of grinding the dried seaweed into particles having a size of No. 12 (1.7 mm) to No. 80 (180 μm); A fourth step of preparing biomass by drying the ground particles at 75 to 85 ° C. for 6 hours; A fifth step of adding the biomass to a FeCl ₃ .6H ₂ O solution, stirring for 2 hours, and then drying the biomass to surface-treat the biomass; And a sixth step of injecting the surface-treated biomass into the pyrolyzer at a flow rate of 2500 cm 3 / min and pyrolyzing the inlet to block the inflow of air.

Description

Method of manufacturing nanometal bio-tea for phosphorus removal and nano-metal bio-tea manufactured according to the present invention

The present invention relates to a seaweed bio-tea manufacturing method that can remove phosphorus from the sewage, and to a method for producing a bio- tea by modifying the surface of the bio- tea with nano-metal in order to increase the phosphorus adsorption performance of the seaweed bio-tea.

In accordance with the strengthening of the effluent standard for total phosphorus in public sewage treatment plants, physical, chemical or biological treatment techniques have been developed for treating phosphorus in sewage treatment plant effluents. In most domestic sewage treatment plants, biological treatment alone cannot satisfy the effluent quality standard for total phosphorus, so the chemical coagulation + filtration, chemical coagulation + sedimentation, or chemical coagulation + flotation technologies are mainly installed after the sewage treatment process. to be.

However, this rear end total phosphorus treatment device has a problem in that a large amount of flocculated sludge occurs, and additional treatment costs must be invested in treating the flocculated sludge. In addition, when agglomerated sludge generated after the post-stage treatment and excess sludge generated in the main treatment process are mixed, it may be difficult to reuse the excess sludge.

To this end, in recent years, a technology for utilizing these agricultural and forest by-products as biochar obtained when pyrolyzing under controlled conditions of air supply has been developed. ] And the like.

However, in the case of bio teas according to the prior art, most of them are used as a direction for reducing greenhouse gases or as an agricultural soil improver to improve soil water retention or retention, and to treat wastewater containing a large amount of phosphorus. It was rarely used as a water treatment agent.

Since the surface of the biocar itself is negatively charged, there are many difficulties in adsorption and removal of phosphorus in the form of anions (PO ₄ ^3- ) in sewage and wastewater.

Korean Patent Publication No. 2010-0117954

The present invention has been made to solve the above problems, an object of the present invention is to derive the optimal seaweed bio-tea manufacturing conditions to easily adsorb the phosphorus present in the anion (PO ₄ ^3- ) form.

In addition, an object of the present invention is to provide a manufacturing condition of the nano-metal bio-tea by modifying the surface of the bio- tea with nano-metal in order to increase the phosphorus adsorption capacity of the seaweed bio-tea.

Technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

According to a feature of the present invention for achieving the above object, the present invention method for producing a phosphorus-removed nano-metal bio-tea is a first step of removing salts by soaking seaweed in distilled water for 2 to 2.5 hours; A second step of drying the algae indoors; A third step of grinding the dried seaweed into particles having a size of No. 12 (1.7 mm) to No. 80 (180 μm); A fourth step of preparing biomass by drying the ground particles at 75 to 85 ° C. for 6 hours; A fifth step of adding the biomass to a FeCl 3 · 6H 2 O solution, stirring for 2 hours, and then drying the biomass to surface-treat the biomass; And a sixth step of injecting the surface-treated biomass into the pyrolyzer at a flow rate of 2500 cm 3 / min and pyrolyzing the inlet to block the inflow of air.

By the means for solving the above problems, the present invention can derive the optimal seaweed bio-tea manufacturing conditions to easily adsorb the phosphorus present in the anion (PO ₄ ^3- ) form.

In addition, the present invention may provide a nano-metal bio tea by modifying the surface of the bio tea with nano-metal in order to increase the phosphorus adsorption capacity of the seaweed bio-tea.

1 is a flow chart showing a method for producing a phosphorus-removed nano-metal bio-tea.
Figure 2 is a photograph showing the biomass and surface morphology and structural analysis of kelp using a scanning electron microscope (SEM).
Figure 3 is a photograph showing the biomass and surface morphology and structural analysis of the fin using a scanning electron microscope (SEM).
Figure 4 (A) is a graph showing the adsorption performance for the phosphorus (phosphate) of the bio-tea prepared using kelp, Figure 4 (B) is a phosphor (phosphate) of the bio-tea prepared using surface-modified kelp It is a graph showing the adsorption performance for.
Figure 5 (A) is a graph showing the adsorption performance for the phosphorus (phosphate) of the bio-car prepared using 톳, Figure 5 (B) is a phosphate of the bio-car manufactured using the surface-modified 톳 It is a graph showing the adsorption performance for.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which the same reference numerals are denoted for components that perform the same function in FIGS. 1 to 5. Meanwhile, in the drawings and detailed description of the drawings, detailed descriptions and illustrations of specific technical configurations and operations of elements not directly related to technical features of the present invention are omitted, and only the technical configurations related to the present invention are briefly shown or Explained.

The present invention relates to a seaweed bio-tea manufacturing method that can remove phosphorus from the sewage, and to a method for producing a bio- tea by modifying the surface of the bio- tea with nano-metal in order to increase the phosphorus adsorption performance of the seaweed bio-tea.

First step (S10) is soaked in seawater for 2 to 2.5 hours and then washed to remove salts. Specifically, the seaweed is preferably at least one selected from kelp and seaweed, and the seaweed is preferably soaked for at least 2 hours to remove all salts. The algae will reduce the adsorption performance of the phosphate of the nanometal-biocha prepared by the present invention without removing the salt.

In addition, when the seaweed is referred to as tap water for less than 2 hours, the salts of the seaweed are not sufficiently removed, resulting in a problem of reducing the adsorption performance of the phosphate of the nanometal-biocar prepared according to the present invention. In this case, it is preferable to carry out under the above conditions since seaweed spreads in water, resulting in loss of material.

Next, the second step (S20) is to dry the seaweed indoors. More specifically, the salted algae is preferably dried sufficiently for 3 to 4 days in a windy room.

When the seaweed is not dried, it is very difficult to grind in the third step (S30), and the concentration of the FeCl ₃ · 6H ₂ O solution to be mixed in the fifth step (S50) is low, making the nano-metal bio tea very difficult to manufacture. Can be.

In addition, the seaweeds from which the salts have been removed are preferably dried in a well-ventilated room. When drying using a dryer, the seaweeds may be deteriorated.

Next, in the third step S30, the dried seaweed is pulverized by a grinder to produce particles having a size of No. 12 (1.7 mm) to No. 80 (180 μm). When the pulverization is manufactured to a size of less than No. 12 (1.7 mm), the time for drying in the fourth step (S40) is not long enough or not sufficiently dried until the inside of the particles, so that thermal decomposition in the sixth step (S60) may be insignificant. When the grinding is pulverized into particles of No. 80 (180 μm) size, the surface modification time may be too long in the fifth step (S50) below, and the adsorption performance of the prepared nanometal-biocar phosphate Since the effect does not differ greatly, it is preferable to carry out under the above conditions.

Next, the fourth step (S40) is to dry the pulverized particles at 75 to 85 ℃ for 6 hours to produce a biomass.

When the pulverized particles are dried at less than 75 ° C., the pulverized particles may not be sufficiently dried. In the sixth step S60, the thermal decomposition effect may be insignificant. When the pulverized particles are dried at more than 85 ° C., the dried biomass may be dried. Since it may burn or deteriorate, it is preferable to carry out on the said conditions.

In addition, if the drying of the pulverized particles is less than 6 hours, the pulverized particles may not be sufficiently dried. If the pulverized particles are dried for more than 6 hours, the dried biomass may be damaged. It is preferable to carry out under the above conditions since there is a possibility of changing or deterioration.

Next, in step S50, the biomass is added to a FeCl ₃ .6H ₂ O solution, stirred for 2 hours, and dried to prepare a surface-modified biomass. Mixing the FeCl ₃ · 6H ₂ O is to make a bio-car having a magnetic surface by modifying the biomass, the FeCl ₃ · 6H ₂ O is preferably prepared in a concentration of 0.1 to 0.2M.

More specifically, the FeCl ₃ · 6H ₂ O solution by stirring for 2 hours. After removal using an 80 (180 μm) sieve, the mixture is aged in an oven at 80 ° C. for 2 hours to harden the coating of FeCl ₃ .6H ₂ O on the biomass, and the surface-treated biomass is completely dried.

When the biomass is added to a FeCl ₃ · 6H ₂ O solution and stirred for less than 2 hours, the biomass is mixed with the biomass so that the surface modification effect is low. When the biomass is stirred for more than 2 hours, the biomass and the FeCl ₃ · Since the coating of the 6H ₂ O solution may drop, it is preferable to carry out under the above conditions.

In addition, when the FeCl ₃ · 6H ₂ O solution is prepared in less than 0.08M concentration nanometal bio-car prepared by the present invention has a slight adsorption performance effect on the phosphate, when the biomass is produced in excess of 0.2M concentration Since the surface of the mass is too thick, the effect of adsorption performance on phosphate may be lowered, and the stirring time and the aging time in the oven may be long, so that the efficiency may be lowered.

Next, the sixth step (S60) is injected into the dried bio-metal pyrolysis at a flow rate of 2500 cm 3 / min and pyrolysis by blocking the flow of air to the pyrolysis.

More specifically, the pyrolysis is carried out at a temperature of 500 ℃ for 2 hours, it is preferable to increase the temperature at a temperature increase rate of 7 ℃ / min to the temperature. The pyrolysis is gradually increased to a temperature of 7 ° C. per minute to prevent the iron chloride coated on the biomass from falling off or deforming. If the pyrolysis temperature is less than 7 ° C., the pyrolysis time may be too long, resulting in the coating surface contacting the most surface of the biomass falling. If the pyrolysis temperature is more than 7 ° C., the biomass is deformed during the pyrolysis. It is preferable to carry out under the above conditions since there is a risk of being damaged or altered.

In addition, the pyrolysis, as shown in Figure 4 (A) and 5 (A), there is a problem that the adsorption performance effect on the phosphate is insignificant when pyrolyzing at a temperature of less than 500 ℃, pyrolysis in excess of 500 ℃ In this case, it is preferable to be carried out under the above conditions because the effect of adsorption performance is lower when compared with 500 ℃.

In addition, when the pyrolysis is performed in less than 2 hours, the thermal decomposition is insignificant, and thus the effect of producing the bio tea is insignificant. When the pyrolysis is performed for more than 2 hours, the manufactured nano metal bio tea may be deteriorated or the surface modification may be deteriorated. It is preferable to carry out on condition.

Hereinafter will be described an embodiment of the method for producing a phosphorus-free nano-metal bio-car described above.

(1) bio tea production

Kelp and mussels were purchased at aquatic product wholesale market, soaked in water for at least 2 hours and washed several times to remove all salts. The washed algae was sufficiently dried in a windy room. Pine sawdust was also washed well after purchase and dried sufficiently in a windy room. The dried biomass was pulverized with a grinder to Passed through 12 (1.70mm) screen and No. Particles of size not over 80 (180 μm) were used in the experiment. The crushed biomass was dried at a temperature of 80 ° C. in a custom dryer (Hanyang Science Co., Ltd.) for 6 hours and then pyrolyzed in a pyrolysis machine to produce bio tea. After weighing enough dry biomass, it was put in a pyrolysis machine and nitrogen gas was injected at a flow rate of 2500 cm 3 / min, and pyrolysis was started while blocking the inflow of air into the apparatus. The temperature was increased slowly at a rate of temperature increase of 7 ° C./min to the pyrolysis target temperature. The pyrolysis temperature was pyrolyzed at 250 ° C., 400 ° C., 500 ° C., 600 ° C., and 700 ° C. for 2 hours to produce bio-teas required for the experiments at each temperature. In the present invention, the kelp raw material is labeled Kelp-R for convenience and the bio-teas produced at 250 ° C., 400 ° C., 500 ° C., 600 ° C. and 700 ° C. are respectively indicated as KB 250, KB 400, KB 500, KB 600, and KB 700. In addition, 톳 raw materials were marked as Hijikia-R, and bio-teas produced at 250 ° C, 400 ° C, 500 ° C, 600 ° C and 700 ° C were labeled as HB250, HB400, HB500, HB600, and HB700, respectively.

(2) Surface modified bio tea production

In order to make the biomass with the biomass by surface modification, the dried and pulverized biomass is _first put into a FeCl ₃ .6H ₂ O solution of a predetermined concentration and stirred for 2 hours. After the FeCl ₃ · 6H ₂ O solution was removed, the water was completely dried, and then injected into a pyrolyser to pyrolyze at a predetermined temperature.

(3) Analysis of physical and chemical properties of bio tea

In order to analyze the bio-tea raw materials and the components of the bio-tea produced using an element analyzer (Element Analyzer) was measured the ratio of C, H, N, S, O contained in each of the materials. The element analyzer used was a Vario-Micro Cube model manufactured by Element Analyzer GmbH (Germany), and the elemental composition ratio of each material was measured using sulfanilic acid as the standard with combustion temperature at 1,150 ℃. FTIR analysis was performed using the Thermo iS50 model (Thermo Fisher Scientic, WI, USA) to analyze the composition of each material by ATR reflection measurement. In order to analyze the effect of pyrolysis temperature on the shape and structure of the bio-tea, FE-SEM (Field Emission Scanning Electron Microscope: MIRA-3, Tescan, Czech Republic) was used to change the magnification and shape of each material. Photographed. The pore size and BET specific surface area of the biocar were measured using a 3Flex & TriStar 3020 model manufactured by Micrometrics (USA). Samples were raised to 100 ° C. using pretreatment equipment (VacPreP 061, Micrometrics, USA) and then dried under vacuum for at least 3 hours and measured using nitrogen gas.

(4) Phosphorus adsorption experiment

K ₂ HPO ₄ used to make the phosphorus solution was purchased from Junsei Chemical Co., LTD (Tokyo, Jpan) as an analytical product with a purity of 99% or more. Inject 0.2 g of bio tea or nano metal bio tea into a 35 mL solution of K ₂ HPO _{4 at a} predetermined concentration, stir for 72 hours, remove the particles in the solution with an injection filter, and measure the concentration of PO ₄ ^{3- in the} equilibrium state. The adsorption performance for phosphorus was evaluated.

In the following, the experimental results according to the above experiments are shown.

G. Elemental Analysis of Biomass and Bio-tea

The ratios of elements C, H, N, S, and O constituting each material measured using an element analyzer are shown in Table 1 below.

unit:% C H N S O Kelp-R 34.0 5.5 1.7 0.6 39.1 KB250 46.2 4.3 2.7 1.1 29.4 KB400 45.5 3.4 2.0 1.5 26.3 KB500 45.3 1.9 1.9 1.8 24.5 KB600 44.8 3.0 1.6 0.5 23.3 KB700 42.5 1.4 1.6 2.0 22.2 Hijikia-r 34.7 5.5 1.8 1.0 44.5 HB250 47.6 3.9 2.5 1.9 30.8 HB400 45.8 3.1 1.9 2.6 26.3 HB500 47.5 2.2 2.1 2.9 23.6 HB600 48.2 1.3 1.8 3.4 21.1 HB700 47.2 1.4 1.6 3.5 21.6

The kelp used to prepare the nanometallic biotea prepared by the present invention contained 34% of carbon and the contents of hydrogen, nitrogen, sulfur and oxygen were 5.5%, 1.7%, 0.6% and 39.1%. The ratio of the elements constituting the kelp rapidly changed through pyrolysis, and the ratio of elemental composition of the biocar produced at 250 ° C. was increased to 46.2% for carbon and to 29.4% for oxygen. In the present invention, when the production temperature of the bio-tea was gradually increased, the carbon content decreased little by little, and the oxygen content decreased little by little. The proportion of hydrogen showed a content of 5.5% in the kelp used to prepare the bio-tea, and the content gradually decreased as the bio-tea preparation temperature was gradually increased. Nitrogen content was 1.7% in the kelp used as the bio-tea raw material, and showed a constant content regardless of the thermal decomposition temperature of the kelp.

Next, the seaweed 톳 contained 34.7% of carbon, and the contents of hydrogen, nitrogen, sulfur, and oxygen were 5.5%, 1.8%, 1.0%, and 44.5%, respectively. The proportion of the elements constituting the char was changed rapidly through pyrolysis as in the kelp, but the ratio of the elemental composition of the bio-car produced at 250 ° C increased to 47.6% for carbon and to 30.8% for oxygen. It was. The content of carbon remained relatively constant even though the pyrolysis temperature increased, but the composition ratio of the remaining elements showed a pattern similar to the change of the composition ratio of kelp as the pyrolysis temperature increased.

N. Biomass and Surface Morphology and Structural Analysis

Scanning electron microscope (SEM) was used to analyze the shape of the surface morphology and structure of the biomass and the manufactured bio-tea as the magnification was changed. Figure 2 (A) shows the surface form and structure of the kelp, (B) is the surface form and structure of the KB250, (C) is the surface form and structure of the KB400, (D) is the surface of the KB500 Form and structure, (E) is the surface form and structure of the KB600, (F) is the surface form and structure of the KB700.

As shown in Figure 2, when comparing the structure of the bio-car prepared by pyrolysis of the kelp and the kelp, all samples appear in a similar form in the low magnification image and it was not easy to distinguish the shape, but images taken at a high magnification The difference in the surface structure is clearly seen.

Next, using the scanning electron microscope (SEM), the shape of the surface morphology and structure of the bio-tea prepared by thermal decomposition of the raw material (톳) and (톳) while analyzing the magnification was analyzed. Figure 3 (A) shows the surface shape and structure of the (톳), (B) is the surface shape and structure of the HB250, (C) is the surface shape and structure of the HB400, (D) is the surface of the HB500 Shape and structure, (E) is the surface shape and structure of the HB600, (F) is the surface shape and structure of the HB700.

Comparing the structure of the bio-car prepared by pyrolysis of 톳 and 것처럼 as shown in Figure 3, in the low-magnification image as in kelp, all the samples appear in a similar form and the shape was not easy to distinguish the images taken at high The difference in the surface structure can be seen clearly. Compared to the material material 톳, bio-cars made using 톳 have distinct pores on the surface, and as the pyrolysis temperature increases, the surface roughness increases and the porosity also increases.

Looking at the morphology of the surface photographed by SEM of the algae used to manufacture the bio-tea of the present invention, it can be observed that there are almost no pores on the surface of the bio-mass. It can be seen that pores are formed on the surface and the pores also increase as the manufacturing temperature of the bio tea increases. Table 2 shows the BET specific surface area of the two seaweeds used as the bio-tea material and the BET specific surface area of the bio-tea according to the pyrolysis temperature.

BET SurfaceArea (m ² / g) Kelp-R 0.032 KB250 0.463 KB400 1.331 KB500 1.404 KB600 1.901 KB700 2.332 Hijikia-r 0.042 HB250 0.693 HB400 1.065 HB500 1.043 HB600 1.150 HB700 2.797

Overall, BET specific surface area tended to increase with increasing pyrolysis temperature, but there was no significant difference in BET specific surface area between raw materials.

C. Adsorption Performance of Phosphorus on Bio-tea

In order to evaluate the adsorption performance of phosphorus (phosphate) of the bio-tea to the phosphorus (phosphate) 3 mg / L solution of the bio-tea prepared by the above method by the method described in the phosphorous adsorption experiment bio-phosphorus ( phosphate) removal rate was measured. Figure 4 (A) shows the removal rate of phosphorus (phosphate) of kelp bio-tea prepared at each pyrolysis temperature. The kelp bio tea produced at the pyrolysis temperature of 250 ℃ showed about 10% phosphorus removal rate, but when the pyrolysis temperature was increased to 400 ℃, the removal rate was increased to more than 85%. The highest phosphorus removal rate was 89.9%.

In addition, Figure 4 (B) is a nanometal kelp bio-thermal decomposition at 500 ℃ after surface treatment of kelp in a constant concentration of FeCl ₃ · 6H ₂ O solution in the fifth step (S50) and the sixth step (S60) It shows the removal rate for phosphate of tea. As shown in FIG. 4 (B), the kelp surface-treated at five different concentrations ranging from 0.025M to 0.3M in the concentration of FeCl ₃ · 6H ₂ O solution was pyrolyzed at a predetermined temperature for each FeCl ₃ · The phosphate adsorption rate of the nanometallic bio tea according to the surface treatment concentration of 6H ₂ O solution was measured.

The KB500 represents kelp bio tea pyrolyzed at 500 ° C. without surface treatment, and K0.025M to K0.3M were each prepared by pyrolysis after surface treatment at a concentration of 0.025M to 0.3M in a FeCl ₃ · 6H ₂ O solution. Metal bio tea is shown. Nanometal kelp bio-teas surface-modified at 0.025M and 0.05M FeCl ₃ · 6H ₂ O solution showed more than 20% reduction in phosphate removal compared to pure bio-teas without surface treatment, but surface-treated at 0.1M and 0.2M Phosphorous adsorption rate of nanometal kelp biocar was higher than that of pure kelp biocar, and nanometal kelp biocar surface-treated in 0.1M solution of FeCl ₃ · 6H ₂ O solution showed the highest phosphorus adsorption rate.

Next, Figure 5 (A) shows the removal rate of phosphate of the bio-tea produced at each pyrolysis temperature. 차 Bio tea produced at pyrolysis temperature of 250 ℃ showed phosphate removal rate of less than 5%, but when pyrolysis temperature was increased to 400 ℃, the removal rate increased significantly to over 65%. The difference was the highest with 66.2% phosphorus removal.

In addition, Figure 5 (B) is a nanometal 톳 bio tea thermally decomposed at 500 ℃ after surface treatment of Fe in a constant concentration of FeCl ₃ · 6H ₂ O solution in the fifth step (S50) and the sixth step (S60) It shows the removal rate for phosphate. As shown in Figure 5 (B), the Chop ₃ · 6H ₂ O from the concentration FeCl 0.025M of solution in the thermal decomposition of the treated surface fusiforme in other concentrations of up to 0.3M of five at each specified temperature FeCl ₃ · Phosphorous adsorption rate of nanometallic bio tea according to 6H ₂ O surface treatment concentration was measured.

The HB500 represents a bio- 한 thermally decomposed at 500 ℃ without surface treatment, H0.025M to H0.3M is a nanoparticle prepared by thermal decomposition after surface treatment at a concentration of 0.025M to 0.3M FeCl ₃ · 6H ₂ O solution, respectively Metal bio tea is shown. As the concentration of FeCl ₃ · 6H ₂ O surface treatment solution was gradually increased, the adsorption rate of phosphorus of the nanometal 톳 bio-car was gradually increased. When the concentration of FeCl ₃ · 6H ₂ O surface treatment solution was 0.1M, the nanometal 톳 Phosphorous adsorption rate of bio-tea was the highest as 95.3%, and when the surface modification solution was increased to 0.2M and 0.3M, the phosphorous adsorption rate decreased.

By the means for solving the above problems, the present invention can derive the optimal seaweed bio-tea manufacturing conditions to easily adsorb the phosphorus present in the anion (PO ₄ ^3- ) form.

In addition, the present invention may provide a nano-metal bio tea by modifying the surface of the bio tea with nano-metal in order to increase the phosphorus adsorption capacity of the seaweed bio-tea.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and their All changes or modifications derived from an equivalent concept should be construed as being included in the scope of the present invention.

S10. A first step of removing the salt by soaking the algae in distilled water for 2 to 2.5 hours;
S20. A second step of drying the algae indoors;
S30. A third step of grinding the dried seaweed into particles having a size of No. 12 (1.7 mm) to No. 80 (180 μm);
S40. A fourth step of preparing the biomass by drying the pulverized particles at 75 to 85 ° C. for 6 hours;
S50. A fifth step of adding the biomass to a FeCl ₃ .6H ₂ O solution, stirring for 2 hours, and then drying the biomass to surface-treat the biomass;
S60. A sixth step of injecting the surface-treated biomass into a pyrolysis machine at a flow rate of 2500 cm 3 / min and pyrolyzing the air by blocking the inflow of air to the pyrolysis machine;

Claims (5)

A first step of soaking at least one seaweed selected from kelp and seaweed in tap water for 2 to 2.5 hours and then washing to remove salts;
A second step of drying the seaweed for 3 to 4 hours indoors;
A third step of grinding the dried seaweed into particles having a size of No. 12 (1.7 mm) to No. 80 (180 μm);
A fourth step of preparing biomass by drying the ground particles at 75 to 85 ° C. for 6 hours;
Adding the biomass to a FeCl ₃ .6H ₂ O solution prepared at a concentration of 0.1 to 0.2 M, stirring for 2 hours, and drying the biomass to surface-treat the biomass to include magnetic;
After the drying, the surface-treated biomass was injected with nitrogen gas at a flow rate of 2500 cm 3 / min in a pyrolyzer and pyrolyzed at a temperature of 500 ° C. by blocking the inflow of air to the pyrolyzer, but the pyrolysis was carried out for 2 hours, Manufactured by the sixth step of increasing the temperature at a temperature increase rate of 7 ° C./min to the temperature;
In the fifth step, added to FeCl ₃ · 6H ₂ O solution and stirred for 2 hours before drying, No. After removing by using an 80 (180㎛) sieve, and aged in an oven at a temperature of 80 ℃ for 2 hours to harden the coating of FeCl 3 · 6H 2 O on the biomass, characterized in that the surface-treated biomass is dried completely Method of producing nanometal bio-tea for phosphorus removal.
delete delete delete Phosphorus removal nanometal bio-tea prepared by the method of claim 1 nanometal bio-tea removal method.

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