WO2018038393A1 - Water treatment apparatus using magnetite and water treatment method using same - Google Patents

Abstract

The present invention relates to a water treatment apparatus that has been made to solve the problem described above, the water treatment apparatus, according to the present invention, comprising: an upward filtration tank (110) which, in order to remove phosphorus contained in polluted water, is provided with a filtration unit (111) filled with magnetite (Fe₃O₄) powder which is a by-product of a steel-rolling process; a first flow path (P1) which transfers polluted water to the filtration tank (110); a branching pipe path (150) which downwardly introduces, into the filtration tank (110), washing water for washing phosphorus adsorbed on the surface of the magnetite (Fe₃O₄) having magnetic force, and which is coupled to the filtration tank (110) in order to discharge the polluted water that has passed through the filtration unit (111), wherein the branching pipe path (150) comprises a coupling part (151) coupling with the filtration tank (110), an outlet part (154) coupled to the coupling part (151) by means of a bent section (152), and an inlet part (155) coupled to a branching section (153) of the outlet part (154); a first adsorption device (160) which is provided to the coupling part (151) in order to recover, using magnetic force, magnetite (Fe₃O₄) powder that is contained in the polluted water as a result of breaking away from the filtration unit (111); a first adsorption unit (A) which is formed on an inner surface of the coupling part (151) by means of the magnetic force of the first adsorption device (160); a second flow path (P2) which is coupled to the outlet part (154) in order to discharge the polluted water; a third flow path (P3) which is coupled to the inlet part (155) so as to enable washing water to be introduced; a washing water tank (120) which is connected to the third flow path (P3); a fourth flow path (P4) which is connected to the filtration tank (110) so as to discharge the washing water; and a phosphorus discharge tank (130) which is connected to the fourth flow path (P4). In this case, the water treatment apparatus, according to the present invention, uses, among iron oxides (Fe₂O₃, Fe₃O₄, FeO) which are by-products generated in steelmaking, magnetite (Fe₃O₄) exhibiting excellent phosphorus or heavy metal adsorption as an adsorbent, and thus the by-products may be recycled. Particularly, magnetite exhibits a strong magnetic force, and has excellent phosphorus adsorption capacity by having a monodentate and a bidentate formed with a phosphate ion on the particle surface thereof (see figure 1), and thus may effectively remove phosphorus from polluted water.

Description

Water treatment device using magnetite and water treatment method using the same

The present invention relates to a water treatment apparatus, and more particularly, to a water treatment apparatus using magnetite (Fe ₃ O ₄ ) and a water treatment method using the same.

Phosphorus is the main cause of eutrophication. When phosphorus is excessively introduced into lakes, rivers or seas, microorganisms multiply, resulting in the rapid depletion of dissolved oxygen, which kills aquatic organisms and destroys ecosystems.

Conventional water treatment apparatuses use a method of removing contaminated water containing phosphorus by biological and physicochemical methods to remove such phosphorus.

However, biological methods require a long time for the removal of phosphorus and have a large residence and storage facilities.

Although the physical method of removing phosphorus by using flocculation sedimentation method has the advantage that the process of removing phosphorus is relatively shorter than biological method, phosphorus removal of alumina sulfate (Al ₂ (SO ₄ ) ₃ ) used as a conventional flocculant The efficiency is not high, there is a problem that a large amount of sludge occurs in the flocculation process.

Although zeolite may be used instead of alumina sulfate (Al ₂ (SO ₄ ) ₃ ) to improve the phosphorus removing effect, zeolite has a problem in that the amount of chemical consumption is high in increasing alkalinity.

The present invention was derived to solve the above problems, and to provide a water treatment apparatus for quickly removing the phosphorus of contaminated water through a filtration tank using a magnetite (Fe ₃ O ₄ ).

In addition, the water treatment apparatus of the present invention can remove the phosphorus in the contaminated water without adding a separate chemical, and can also reduce the operating cost of the water treatment by using a semi-permanent magnetite (Fe ₃ O ₄ ) as a phosphorus adsorbent.

Finally, the water treatment apparatus of the present invention does not generate by-products such as sludge in the phosphorus removal step.

The present invention has been derived to solve the above problems, the water treatment device of the present invention to remove the phosphorus contained in the contaminated water, the filter part filled with the magnetite (Fe ₃ O ₄ ) powder which is a by-product of the steel rolling process An upward filtration tank 110 having a 111; A first flow passage (P1) for transferring the contaminated water to the filtration tank 110; In order to discharge the washing water for washing the phosphorus adsorbed on the surface of the magnetite (Fe ₃ O ₄ ) having a magnetic force downward to the filtration tank 110, and to discharge the contaminated water passed through the filtration unit 111 And a branch pipe line 150 coupled to the filtration tank 110, wherein the branch pipe line 150 includes a coupling part 151 coupled to the filtration tank 110; An outlet portion 154 coupled to the coupling portion 151 by a bent portion 152; An inlet 155 coupled to the branch 153 of the outlet 154; and the magnetite (Fe ₃ O ₄ ) powder separated from the filtration unit 111 and included in the contaminated water. A first adsorption device 160 formed on the coupling part 151 to recover the magnetic force; A first suction part (A) formed on the inner side of the coupling part 151 by the magnetic force of the first suction device 160; A second flow path (P2) coupled to the outlet portion 154 to discharge the contaminated water; A third flow path (P3) coupled to the inlet 155 to allow the washing water to flow therein; A washing tank 120 connected to the third flow path P3; A fourth flow passage (P4) connected to the filtration tank 110 to discharge the washing water; And a phosphorus discharge tank 130 connected to the fourth flow path P4.

The first adsorption device 160 includes a first fixing part 161 coupled to the coupling part 151 in a structure surrounding the outer side of the coupling part 151; A pair of first connectors 163, one side of which is coupled to the first fixing part 161 by a hinge structure and the other side of which rotates outward with respect to the first hinge part 162; It is preferable to include; a first magnetic force portion 164 is coupled to the other side of the pair of the first connection portion 163 and formed in a structure surrounding the coupling portion 151.

The inner surface of the first magnetic portion 164 is in close contact with the outer surface of the coupling portion 151 in a structure corresponding to the outer surface of the coupling portion 151, the first magnetic portion 164 is the contaminated water It is preferable to generate magnetic force while being discharged through the second flow path P2 to adsorb the magnetite (Fe ₃ O ₄ ) powder included in the contaminated water to the first adsorption portion (A).

The first adsorption device 160 loses magnetic force while the washing water is introduced through the inlet 155 so that the magnetite (Fe ₃ O ₄ ) adsorbed to the first adsorption unit A is filtered. It is preferable to re-introduce into 110.

The washing water is preferably sodium hydroxide (NaOH) solution.

The magnetite (Fe ₃ O ₄ ) powder is preferably installed in a size of less than 300㎛.

It is preferable that the second storage device 170 for recovering the magnetite (Fe ₃ O ₄ ) powder passing through the first adsorption portion A is formed outside the bent portion 152.

The second adsorption device 170 includes a second fixing part 171 coupled to the outlet part 154 adjacent to the bent part 152 in a structure surrounding the outlet part 154; A second connection part 173 having one side coupled to a hinge structure on an upper side of the second fixing part 171, and the other side rotatingly driven upward based on the second hinge part 172; It is preferable to include; a second magnetic force portion 174 coupled to the other side of the second connection portion 173 and formed to surround the upper portion of the outlet portion 154.

The phosphorus discharge tank 130 is preferably interconnected by the phosphorus storage tank 140 and the sixth flow path (P6) for adjusting the concentration of the phosphorus.

The phosphorus discharge tank 130 is interconnected by the washing tank 120 and the fifth flow path (P5), and to transfer the washing water of the phosphorus discharge tank 130 to the washing water tank 120 to reuse the washing water. desirable.

Water treatment method using a water treatment device according to an embodiment of the present invention includes a contaminated water transfer step of transferring the contaminated water to the filtration tank 110; A filtration step of removing the phosphorus contained in the contaminated water from the filtration unit 111; A first adsorption part magnetic force forming step of forming a magnetic force on the first adsorption part A; A contaminated water discharge step of blocking the inlet part 155 and opening the outlet part 154 to discharge the contaminated water; A first adsorption part magnetic force removing step of removing a magnetic force to the first adsorption part A; A washing step of opening the inlet 155 and blocking the outlet 154 to deliver the washing water to the filtration tank; After washing the filtration unit 111, the washing water transport step for sending the washing water containing the phosphorus to the phosphorus discharge tank 130; includes.

Water treatment method using a water treatment device according to another embodiment of the present invention includes a contaminated water transfer step of transferring the contaminated water to the filtration tank 110; A filtration step of removing the phosphorus contained in the contaminated water from the filtration unit 111; Magnetic force forming step of forming a magnetic force on the first and second adsorption portion (A) and (B); A contaminated water discharge step of blocking the inlet part 155 and opening the outlet part 154 to discharge the contaminated water; Magnetic force removal step of removing the magnetic force of the first and second adsorption portion (A) and (B); A washing step of opening the inlet 155 and blocking the outlet 154 to deliver the washing water to the filtration tank; After washing the filtration unit 111, the washing water transport step for sending the washing water containing the phosphorus to the phosphorus discharge tank 130; includes.

Water treatment method using a water treatment device according to another embodiment of the present invention includes a contaminated water transfer step of transferring the contaminated water to the filtration tank 110; A filtration step of removing the phosphorus contained in the contaminated water from the filtration unit 111; A first adsorption part magnetic force forming step of forming a magnetic force on the first adsorption part A; A contaminated water discharge step of blocking the inlet part 155 and opening the outlet part 154 to discharge the contaminated water; A first adsorption part magnetic force removing step of removing a magnetic force to the first adsorption part A; A washing step of opening the inlet 155 and blocking the outlet 154 to deliver the washing water to the filtration tank; After washing the filtration unit 111, the washing water transport step of sending the washing water containing the phosphorus to the phosphorus discharge tank 130; In order to use the washing water as an agricultural fertilizer, the phosphorus concentration step of sending the washing water of the phosphorus discharge tank 130 to the phosphorus storage tank 140, and further supply phosphorus; After the phosphorus concentration step, the concentrated water outflow step of outflowing the wash water of the phosphorus storage tank 130; includes.

After the washing water transport step, the washing water returning step of sending the washing water of the phosphorus discharge tank 130 to the washing water tank 120 to reuse the washing water;

According to the present invention, the initial construction cost can be minimized because the water treatment apparatus can be operated using the existing general water purification facility.

According to the present invention, since the water treatment process can be adjusted according to the turbidity of the mixed water or brackish water mixed with surface water and seawater and the concentration of TDS (Total Dissolved Solid, Total Dissolved Solids), reasonable and economical water treatment is possible. .

According to the present invention, since the mixed water or brackish water mixed with the seawater is used, it is an effective water treatment method in coastal areas with insufficient water.

1 is a block diagram of a combination of magnetite and phosphorus of the present invention.

Figure 2 is a side view of the water treatment device according to an embodiment of the present invention.

Figure 3 is a branch pipe coupling diagram according to an embodiment of the present invention.

Figure 4 is a second adsorption device coupling diagram according to an embodiment of the present invention.

5 is a magnetic force forming and magnetic force removal process of the first adsorption apparatus according to an embodiment of the present invention.

Figure 6 is a side view of the first adsorption device according to an embodiment of the present invention.

*** Explanation of Codes ***

A: first adsorption part B: second adsorption part

P1: Euro 1 P2: Euro 2

P3: Euro 3 P4: Euro 4

P5: Euro 5 100: Water treatment device

110: filtration tank 111: filtration unit

120: washing water tank 130: phosphorus discharge tank

140: storage tank 150: branch pipe

151: coupling portion 152: bending portion

153: branch portion 154: outlet portion

155: inlet 160: first adsorption device

161: First Government 162: First Hingo Government

163: first connection portion 164: first magnetic portion

170: second adsorption device 171: second fixing part

172 Second Hinge Government 173 Second Connection

174: Second magnetic force

An embodiment of a water treatment apparatus using a magnetite (Fe ₃ O ₄ ) and a water treatment method using the same according to the present invention will be described in detail with reference to the accompanying drawings, in the following description, the same or corresponding configuration Elements are given the same reference numerals and redundant description thereof will be omitted.

In addition, terms such as first and second used below are merely identification symbols for distinguishing the same or corresponding components, and the same or corresponding components are limited by terms such as the first and second components. no.

In addition, the coupling does not only mean the case where the physical contact is directly between the components in the contact relationship between the components, other components are interposed between the components, the components in the other components Use it as a comprehensive concept until each contact.

Hereinafter, a water treatment apparatus using magnetite (Fe ₃ O ₄ ) and a water treatment method using the same will be described in detail with reference to the accompanying drawings.

The present invention has been derived to solve the above problems, the water treatment device of the present invention to remove the phosphorus contained in the contaminated water, the filter part filled with the magnetite (Fe ₃ O ₄ ) powder which is a by-product of the steel rolling process An upward filtration tank 110 having a 111; A first flow path P1 transferring contaminated water to the filtration tank 110; The washing water for washing the phosphorus adsorbed on the surface of the magnetite (Fe ₃ O ₄ ) having a magnetic force flows downward into the filtration tank 110, to the filtration tank 110 to discharge the contaminated water passing through the filtration unit 111. It comprises a; branch pipe line 150; includes, the branch pipe line 150 is a coupling portion 151 is coupled to the filtration tank 110; An outlet portion 154 coupled to the coupling portion 151 by the bent portion 152; An inlet 155 coupled to the branch 153 of the outlet 154 and recovering the magnetite (Fe ₃ O ₄ ) powder contained in the contaminated water separated from the filtration unit 111 by magnetic force. A first adsorption device (160) formed on the coupling part (151); A first suction part A formed on the inner side of the coupling part 151 by the magnetic force of the first suction device 160; A second flow path P2 coupled to the outlet 154 to discharge the contaminated water; A third flow path P3 coupled to the inlet 155 so that the washing water flows in; A washing tank 120 connected to the third passage P3; A fourth flow passage (P4) connected to the filtration tank 110 to discharge the washing water; It includes; phosphorus discharge tank 130 connected to the fourth flow path (P4).

In this case, since the water treatment apparatus of the present invention uses magnetite (Fe ₃ O ₄ ), which is excellent in adsorption of phosphorus or heavy metal, from iron oxides (Fe ₂ O ₃ , Fe ₃ O ₄ , FeO), which are by-products generated in the steel making process, as an adsorbent. By-products can be recycled.

In particular, magnetite has a strong magnetic force, and mono-dentate and bi-dentate with phosphate ions are formed on the surface of the particles, so that the phosphorous adsorption performance is excellent (see FIG. 1), so that phosphorus in contaminated water can be effectively removed.

In addition, the water treatment apparatus of the present invention removes the phosphorus of the contaminated water only by passing the contaminated water flowing upward into the filtration unit 111 filled with the powder of magnetite, so that the phosphorus of the contaminated water is earlier than the water treatment time of the conventional phosphorus removal method. It can eliminate the need for a large water treatment plant, and can reduce the manufacturing cost of the water treatment plant.

In addition, the water treatment apparatus of the present invention is excellent in environmental friendliness since sludge does not occur after the water treatment and no environmentally harmful by-products are generated.

A feature of the water treatment device of the present invention is that some magnetite powder separated from the filtration part 11 is adsorbed in the first adsorption device so as not to flow out through the outlet part.

Magnetite powder having a strong magnetic force adheres to the first adsorption portion having magnetic force, thereby preventing the loss of magnetite.

The first suction part may be formed of a solenoid valve structure or may be formed of a structure that can be opened and closed manually.

The first adsorption device 160 includes: a first fixing part 161 coupled to the coupling part 151 in a structure surrounding the outer side of the coupling part 151; A pair of first connectors 163, one side of which is coupled to the first fixing part 161 by a hinge structure, and the other side of which rotates outward with respect to the first hinge part 162; It is preferable to include; a first magnetic force portion 164 coupled to the other side of the pair of first connection portion 163 and formed in a structure surrounding the coupling portion 151.

The inner surface of the first magnetic force portion 164 is in close contact with the outer surface of the coupling portion 151 in a structure corresponding to the outer surface of the coupling portion 151, the first magnetic portion 164 is contaminated water second flow path (P2) It is preferable to generate a magnetic force while being discharged through to adsorb the magnetite (Fe ₃ O ₄ ) powder contained in the contaminated water to the first adsorption portion (A).

In this case, the first magnetic force unit 164 may be automatically or manually detached from the outer surface of the coupling unit 151 by the first hinge fixing unit 162.

The first magnetic force unit 164 that is automatically or manually detached forms a strong magnetic force on the first adsorption unit A because the first magnetic force unit 164 is closely coupled to the outer surface of the coupling unit 151 in a structure corresponding to the outer surface of the coupling unit 151. can do.

The first adsorption device 160 loses magnetic force while the washing water is introduced through the inlet 155 so that the magnetite (Fe ₃ O ₄ ) adsorbed to the first adsorption unit A is re-introduced into the filtration tank 110. It is preferred to be introduced.

In this case, the magnetite (Fe ₃ O ₄ ) powder adsorbed on the first adsorption unit A is blocked by the outflow of the contaminated water, and then returned to the filtration tank 110 by the washing water introduced downward through the inlet 155. Is committed.

The washing water is preferably sodium hydroxide (NaOH) solution.

In this case, since magnetite (Fe ₃ O ₄ ) has an amphoteric property, phosphorus desorption is facilitated by OH ⁻ .

Therefore, when the magnetite (Fe ₃ O ₄ ) powder having phosphorus adsorbed on the surface is immersed in sodium hydroxide (NaOH) solution, phosphorus is immediately eliminated.

Magnetite (Fe ₃ O ₄ ) powder is preferably installed in a size of 300㎛ or less.

In this case, the magnetite (Fe ₃ O ₄ ) powder is formed to a size of 300㎛ or less to effectively adsorb the phosphorus contained in the contaminated water.

It is preferable that a second storage device 170 is formed outside the bent portion 152 to recover the magnetite (Fe ₃ O ₄ ) powder that has passed through the first adsorption portion (A).

The second adsorption device 170 may include: a second fixing part 171 coupled to the outlet part 154 adjacent to the bent part 152 in a structure surrounding the outlet part 154; A second connection part 173 having one side coupled to a hinge structure at an upper side of the second fixing part 171, and the other side rotatingly driven upward based on the second hinge part 172; It is preferable to include a second magnetic force portion (174) formed in a structure coupled to the other side of the second connection portion 173 to surround the upper portion of the outlet portion (154).

In this case, as shown in FIG. 4, since the second magnetic force part 174 is installed in close contact with the outer surface of the cutting part 152, the magnetite (Fe ₃ O ₄ ) powder of which the speed is reduced while passing through the bend part 152 is reduced. Easy to recover

In addition, since the contaminated water collides with the outer surface of the bent portion 152 while passing through the bent portion 152, phosphorous contained in the contaminated water can be effectively adsorbed.

The phosphorus discharge tank 130 is preferably interconnected by the phosphorus storage tank 140 and the sixth flow path (P6) for adjusting the phosphorus concentration.

Phosphorus discharge tank 130 is interconnected by the washing water tank 120 and the fifth flow path (P5), it is preferable to transfer the washing water of the phosphorus discharge tank 130 to the washing water tank 120 to reuse the washing water.

In this case, the washing water of the washing tank 120 is reused until a constant concentration.

Water treatment method using a water treatment device according to an embodiment of the present invention is a contaminated water transfer step of transporting the contaminated water upward to the filtration tank 110; A filtration step of removing phosphorus contained in the contaminated water from the filtration unit 111; A first adsorption part magnetic force forming step of forming a magnetic force in the first adsorption part A; A contaminated water discharge step of blocking the inlet 155 and opening the outlet 154 to discharge the contaminated water; A first adsorption part magnetic force removing step of removing a magnetic force to the first adsorption part A; An inlet 155 is opened and an outlet 154 is blocked so that the washing water is delivered to the filtration tank; After washing the filtration unit 111, the washing water transport step of sending the washing water containing phosphorus to the discharge tank 130; includes.

In this case, in the discharge step of the contaminated water, a magnetic force is formed in the first adsorption part to prevent the magnetite (Fe ₃ O ₄ ) powder from escaping to the outlet part. The magnetite (Fe ₃ O ₄ ) powder, which was opened and attached to the first adsorption part by washing water, is re-injected into the filtration tank 110.

Water treatment method using a water treatment device according to another embodiment of the present invention includes a contaminated water transfer step of transferring the contaminated water to the filtration tank 110; A filtration step of removing phosphorus contained in the contaminated water from the filtration unit 111; Magnetic force forming step of forming a magnetic force on the first and second adsorption portion (A) and (B); A contaminated water discharge step of blocking the inlet 155 and opening the outlet 154 to discharge the contaminated water; Magnetic force removal step of removing the magnetic force of the first and second adsorption portion (A) and (B); An inlet 155 is opened and an outlet 154 is blocked so that the washing water is delivered to the filtration tank; After washing the filtration unit 111, the washing water transport step of sending the washing water containing phosphorus to the discharge tank 130; includes.

In this case, magnetic force may be formed in the first and second adsorption portions A and B to prevent the magnetite (Fe ₃ O ₄ ) powder from escaping to the outlet portion more effectively.

Water treatment method using a water treatment device according to another embodiment of the present invention includes a contaminated water transfer step of transferring the contaminated water to the filtration tank 110; A filtration step of removing phosphorus contained in the contaminated water from the filtration unit 111; A first adsorption part magnetic force forming step of forming a magnetic force in the first adsorption part A; A contaminated water discharge step of blocking the inlet 155 and opening the outlet 154 to discharge the contaminated water; A first adsorption part magnetic force removing step of removing a magnetic force to the first adsorption part A; An inlet 155 is opened and an outlet 154 is blocked so that the washing water is delivered to the filtration tank; After washing the filtration unit 111, the washing and transporting step of sending the washing water containing phosphorus to the phosphorus discharge tank 130; In order to use the washing water as an agricultural fertilizer, the washing water of the phosphorus discharge tank 130 is sent to the phosphorus storage tank 140, the phosphorus concentration step of supplying additional phosphorus; After the phosphorus concentration step, the concentrated water outflow step of outflowing the washing water of the phosphorus storage tank 130; includes.

In this case, the washed water reused a number of times is transferred to the phosphorus storage tank 140 to be improved as a fertilizer.

The wash water in the phosphorus storage tank 140 is improved by adding additional phosphorus as agricultural fertilizer and then flows out.

After the washing water transport step, the washing water returning step of sending the washing water of the discharge tank 130 to the washing water tank 120 to reuse the washing water;

Claims (14)

In order to remove the phosphorus contained in the contaminated water, the upward filtration tank 110 having a filter 111 filled with the magnetite (Fe ₃ O ₄ ) powder which is a by-product of the steel rolling process; A first flow passage (P1) for transferring the contaminated water to the filtration tank 110; In order to discharge the washing water for washing the phosphorus adsorbed on the surface of the magnetite (Fe ₃ O ₄ ) having a magnetic force downward to the filtration tank 110, and to discharge the contaminated water passed through the filtration unit 111 Includes; branch pipe line 150 coupled to the filtration tank 110; The branch pipe 150 is A coupling part 151 coupled to the filtration tank 110; An outlet portion 154 coupled to the coupling portion 151 by a bent portion 152; And an inlet 155 coupled to the branch 153 of the outlet 154. A first adsorption device 160 formed at the coupling part 151 to recover the magnetite (Fe ₃ O ₄ ) powder contained in the contaminated water separated from the filtration part 111 by magnetic force; A first suction part (A) formed on the inner side of the coupling part 151 by the magnetic force of the first suction device 160; A second flow path (P2) coupled to the outlet portion 154 to discharge the contaminated water; A third flow path (P3) coupled to the inlet 155 to allow the washing water to flow therein; A washing tank 120 connected to the third flow path P3; A fourth flow passage (P4) connected to the filtration tank 110 to discharge the washing water; And a phosphorus discharge tank (130) connected to the fourth flow path (P4). The method of claim 1, The first adsorption device 160 A first fixing part 161 coupled to the coupling part 151 in a structure surrounding the outer side of the coupling part 151; A pair of first connectors 163, one side of which is coupled to the first fixing part 161 by a hinge structure and the other side of which rotates outward with respect to the first hinge part 162; And a first magnetic force portion (164) coupled to the other side of the pair of first connection portions (163) to surround the coupling portion (151). The method of claim 2, The inner surface of the first magnetic portion 164 is in close contact with the outer surface of the coupling portion 151 in a structure corresponding to the outer surface of the coupling portion 151, The first magnetic force unit 164 generates a magnetic force while the polluted water is discharged through the second flow path P2 to extract the magnetite (Fe ₃ O ₄ ) powder included in the polluted water in the first adsorption unit ( A) water treatment device characterized in that the adsorption. The method of claim 1, The first adsorption device 160 While the magnetic force is lost while the washing water is introduced through the inlet 155, the magnetite (Fe ₃ O ₄ ) adsorbed to the first adsorption part A is re-introduced into the filtration tank 110. Water treatment device characterized in that. The method of claim 1, The washing water is a water treatment apparatus, characterized in that the sodium hydroxide (NaOH) solution. The method of claim 1, The magnetite (Fe ₃ O ₄ ) powder is a water treatment device, characterized in that installed in the size of less than 300㎛. The method of claim 1, Outside of the bent portion 152 Water treatment apparatus, characterized in that the second storage device (170) for recovering the magnetite (Fe ₃ O ₄ ) powder passing through the first adsorption portion (A) is formed. The method of claim 7, wherein The second adsorption device 170 A second fixing part 171 coupled to the outlet part 154 adjacent to the bent part 152 in a structure surrounding the outlet part 154; A second connection part 173 having one side coupled to a hinge structure on an upper side of the second fixing part 171, and the other side rotatingly driven upward based on the second hinge part 172; And a second magnetic force portion (174) coupled to the other side of the second connection portion (173) to surround the upper portion of the outlet portion (154). The method of claim 1, The phosphorus discharge tank 130 is a water treatment device, characterized in that interconnected by the phosphorus storage tank 140 and the sixth flow path (P6) for adjusting the concentration of the phosphorus. The method of claim 1, The phosphorus discharge tank 130 is interconnected by the washing tank 120 and the fifth flow path (P5), to transfer the washing water of the phosphorus discharge tank 130 to the washing water tank 120 to reuse the washing water. Water treatment device characterized in that. A water treatment method using the water treatment apparatus of any one of claims 1 to 6, A contaminated water transfer step of transferring the contaminated water to the filtration tank 110; A filtration step of removing the phosphorus contained in the contaminated water from the filtration unit 111; A first adsorption part magnetic force forming step of forming a magnetic force on the first adsorption part A; A contaminated water discharge step of blocking the inlet part 155 and opening the outlet part 154 to discharge the contaminated water; A first adsorption part magnetic force removing step of removing a magnetic force to the first adsorption part A; A washing step of opening the inlet 155 and blocking the outlet 154 to deliver the washing water to the filtration tank; After washing the filtration unit 111, the washing water transport step of sending the washing water containing the phosphorus to the phosphorus discharge tank 130; Water treatment method comprising a. A water treatment method using the water treatment apparatus of any one of claims 7 and 8, A contaminated water transfer step of transferring the contaminated water to the filtration tank 110; A filtration step of removing the phosphorus contained in the contaminated water from the filtration unit 111; Magnetic force forming step of forming a magnetic force on the first and second adsorption portion (A) and (B); A contaminated water discharge step of blocking the inlet part 155 and opening the outlet part 154 to discharge the contaminated water; Magnetic force removal step of removing the magnetic force of the first and second adsorption portion (A) and (B); A washing step of opening the inlet 155 and blocking the outlet 154 to deliver the washing water to the filtration tank; After washing the filtration unit 111, the washing water transport step of sending the washing water containing the phosphorus to the phosphorus discharge tank 130; Water treatment method comprising a. A water treatment method using the water treatment device of claim 9, A contaminated water transfer step of transferring the contaminated water to the filtration tank 110; A filtration step of removing the phosphorus contained in the contaminated water from the filtration unit 111; A first adsorption part magnetic force forming step of forming a magnetic force on the first adsorption part A; A contaminated water discharge step of blocking the inlet part 155 and opening the outlet part 154 to discharge the contaminated water; A first adsorption part magnetic force removing step of removing a magnetic force to the first adsorption part A; A washing step of opening the inlet 155 and blocking the outlet 154 to deliver the washing water to the filtration tank; After washing the filtration unit 111, the washing water transport step of sending the washing water containing the phosphorus to the phosphorus discharge tank 130; In order to use the washing water as an agricultural fertilizer, the phosphorus concentration step of sending the washing water of the phosphorus discharge tank 130 to the phosphorus storage tank 140, and further supply phosphorus; After the phosphorus concentration step, the concentrated water outflow step of draining the washing water of the phosphorus storage tank 130; water treatment method comprising a. The method of claim 13, After the washing transport step, The water treatment method further comprises; washing water returning step of sending the washing water of the phosphorus discharge tank 130 to the washing water tank 120 to reuse the washing water.

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