KR100868980B1 - Sewage Treatment Equipment and Sewage Treatment Method Using The Same - Google Patents

Abstract

 According to the present invention, a current flows into an electrolytic cell 40 in which sewage flows, at least one pair of electrode assemblies 50, 60, and 70, and the electrode assemblies 50, 60, and 70 which electrolyze the sewage flowing in the electrolytic cell 40. The controller 30 for controlling the power supply unit 20 for applying the current, and the current applied from the power supply unit 20 is alternately supplied to the electrode assembly (50, 60, 70) at a predetermined time interval. Sewage treatment apparatus characterized in that it comprises a. According to the present invention as described above there is an advantage that the foreign matter stuck to the electrode plate is easily peeled off.

Electrolysis, Electrolyzer, Electrode Assembly, Electrode Plate

Description

Sewage disposal device and sewage disposal method using the same

1 is a block diagram schematically showing a sewage treatment apparatus for the present invention.

2 is a plan view showing an electrolytic cell constituting an embodiment of the present invention.

Figure 3 is a flow chart showing the process of sewage treatment according to a preferred embodiment of the sewage treatment method according to the present invention.

Explanation of symbols on the main parts of the drawings

10: sewage treatment apparatus 20: power supply

30: controller 35: relay unit

40: electrolytic cell 50, 60, 70: electrode assembly

51, 61, 71: first electrode support 53, 63, 73: second electrode support

55, 65, 75: first electrode plate 57, 67, 77: second electrode plate

The present invention relates to a sewage treatment apparatus and a sewage treatment method using the same, and more particularly, to a sewage treatment apparatus and a sewage treatment method capable of treating various types of water, sewage and wastewater by an electrolysis method.

As an industrial wastewater treatment method, it is common to perform various biological and physical treatments in parallel with conventional biological treatments. However, since there are many kinds of wastewater and most of them contain hardly decomposable organic substances, there are many difficulties in completely purifying them. Therefore, as the constituents of the wastewater become complicated and the concentration increases, the technique of oxidizing the wastewater by the electrolysis method has attracted attention.

The basic principle of the electrolytic treatment method is the oxidative action generated by the electrolysis of salts contained in wastewater and wastewater, the instantaneous sterilization by ozone component, or the addition of externally added sodium chloride (NaCl). Hypochlorite (OCl) is used to decompose organic matter in wastewater. When sodium chloride (NaCl) solution is electrolyzed in an electrolytic cell without a diaphragm, OH is generated along with chlorine gas at the positive electrode and hydrogen gas at the negative electrode. OCI ions and instantaneous ozone component are instantaneously generated. The electrode plate used in the electrolysis is mainly made of metals such as platinum, titanium, nickel, and stainless steel, and in some cases, an oxide film is coated on the surface thereof. Sometimes.

However, in the conventional method of treating wastewater by electrolysis, wastewater is directly introduced into an electrolytic cell in which a positive electrode plate and a negative electrode plate are installed, oxidative decomposition is performed by applying a positive current to a positive electrode and a negative current to a negative electrode. In the case of the highly decomposable wastewater having a relatively high chemical oxygen demand (COD) content, since a lot of floc is generated during the treatment, foreign matter adheres to the surface of the negative electrode plate, thereby rapidly decreasing the electrolytic efficiency. An overvoltage occurs between the cathodes, thereby increasing the energy consumption. Therefore, the electrode plate to which foreign matters are stuck has to be washed from time to time with chemicals such as hydrochloric acid. In addition, when an electrode plate coated with an oxide film is used, problems such as shortening of the life of the electrode plate may occur due to damage of the coating film during frequent surface cleaning processes.

Accordingly, an object of the present invention is to solve the problems as described above, and to provide a sewage treatment apparatus and a sewage treatment method using the same that can be easily peeled off foreign matter adhering to the electrode plate.

Another object of the present invention is to provide a sewage treatment apparatus and a sewage treatment method using the same, which can reduce energy consumption by preventing overvoltage generated between electrode plates by easily peeling off foreign substances attached to the electrode surface.

According to a feature of the present invention for achieving the above object, the present invention is an electrolytic cell in which sewage flows, at least one pair of electrode assemblies for electrolyzing the sewage flowing in the electrolytic cell, a power source for applying a current to the electrode assembly And a controller configured to control the current applied from the power applying unit to be alternately supplied to the electrode assembly at predetermined time intervals, wherein the electrode assembly includes a plurality of first electrode plates, which are titanium electrode plates. And a second electrode support including a first electrode support and a plurality of second electrode plates, which are titanium or nickel alloy electrode plates, wherein the first electrode support and the second electrode support are orthogonal to the flow direction of the sewage. It is provided to be spaced apart by a predetermined interval in the flow direction, the first electrode plate and the second electrode plate is the flow direction of sewage The first electrode support and the second electrode support are respectively provided to be spaced apart by a predetermined interval in a direction orthogonal to the flow direction of the sewage so as to be parallel to.
The first electrode plate includes an iridium (Ir) compound, ruthenium (Ru) compound, tin (Sn) compound, manganese (Mn) compound, titanium (Ti) compound, molybdenum (Mo) compound, tantalum (Ta) compound, zirconium ( Zr) at least one selected from compounds is coated.
The material of the first electrode support and the second electrode support is titanium.
The first electrode plate and the second electrode plate are provided on opposite surfaces of the first electrode support and the second electrode support alternately in a direction orthogonal to the flow direction of the sewage.
The electrode assembly includes a plurality of electrodes provided in an electrolytic cell, and the controller includes a second electrode different from any one of the first electrode support or the second electrode support of the pair of electrode assemblies provided most spaced out of the electrode assemblies. The current is applied to the support or the first electrode support in different directions to control the first and second electrode supports of different electrode assemblies provided therebetween to be charged and alternately polarized.

delete

delete

delete

delete

delete

delete

According to another feature of the invention, the present invention provides a sewage treatment apparatus for electrolyzing sewage flowing through an electrolytic cell by applying power to at least one electrode assembly: (A) a controller according to claims 1 to 3, Controlling the electrolysis of sewage by applying a current in one direction to the electrode assembly of any one of claims 6 and 7; (B) controlling the controller to electrolyze sewage by applying a current in the opposite direction to the electrode assembly; (C) the controller controlling the steps (A) and (B) to be repeatedly performed; And (D) sewage electrolyzed in step (C) is precipitated and filtered.

In the step (B), (B1) the controller detects the time when the current in one direction is applied to the electrode assembly in the step (A), (B2) the controller is detected in the (B1) Comparing the time with the preset time, and (B3) applying the current in the opposite direction only when the time detected in the step (B2) exceeds the preset time.

The current is cut off only when steps (B) and (C) are repeated for a predetermined time.

According to the present invention as described above there is an advantage that the foreign matter stuck to the electrode plate is easily peeled off.

Hereinafter, a preferred embodiment of a sewage treatment apparatus and a sewage treatment method using the same according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing a sewage treatment apparatus according to the present invention, Figure 2 is a plan view showing an electrolytic cell constituting an embodiment of the present invention.

As shown in this, the sewage treatment apparatus 10 is provided with a power applying unit 20. The power applying unit 20 receives power from the outside to transfer current to the electrode assembly 50 to be described below.

And the sewage treatment apparatus 10 is provided with a controller (30). The controller 30 controls the current applied by the power applying unit 20. The controller 30 is provided with a relay unit 35. The relay unit 35 serves to convert the direction of the current applied from the power applying unit 20.

On the other hand, the sewage treatment apparatus 10 is provided with an electrolytic cell 40 is formed a space for flowing sewage. The electrolytic cell 40 is provided with a plurality of electrode assemblies. In this embodiment, three electrode assemblies are provided. The electrode assembly is composed of first to third electrode assemblies 50, 60, and 70. The first to third electrode assemblies 50, 60, and 70 have a pair of electrode supports, that is, a first electrode support 51, 61, 71, a second electrode support 53, 63, 73, and a pair of electrode supports. The electrode plate, that is, the first electrode plate 55, 65, 75 and the second electrode plate (57, 67, 77). The first electrode supports 51, 61, 71 and the second electrode supports 53, 63, and 73 may include the first electrode plates 55, 65, 75 and the second electrode plates 57, 67, 77).

The first electrode support 51, 61, 71 and the second electrode support 53, 63, 73 are formed in a bar shape having a predetermined length. The first electrode support 51, 61, 71 and the second electrode support 53, 63, 73 are spaced apart from each other in the flow direction of the sewage so as to be orthogonal to the flow direction of the sewage flowing through the electrolytic cell 40. It is provided. And both ends of the first electrode support (51, 61, 71) and the second electrode support (53, 63, 73) is fixed to both sides of the electrolytic cell 40, respectively.

The first electrode support 51, 61, 71 and the second electrode support 53, 63, 73 are formed of a material having corrosion resistance, for example, a material such as titanium. Since the first electrode supports 51, 61, 71 and the second electrode supports 53, 63, 73 are provided in sewage, the first electrode supports 51, 61, 71 and the second electrode supports 53, 63,73) to prevent the contamination of the sewage and corrosion.

The first electrode plates 55, 65, 75 and the second electrode plates 57, 67, 77 are respectively formed on the first electrode supports 51, 61, 71 and the second electrode supports 53, 63, 73. It is provided. The first electrode plates 55, 65, and 75 are formed of iridium (Ir) compounds, ruthenium (Ru) compounds, tin (Sn) compounds, manganese (Mn) compounds, titanium (Ti) compounds, and molybdenum (Mo) on the titanium electrode plates. ) At least one selected from among a compound, a tantalum (Ta) compound, and a zirconium (Zr) compound is coated, and the second electrode plates 57, 67, 77 are formed of titanium or nickel alloy electrode plates. . This is because the titanium substrate has acid resistance and chemical resistance and has a relatively high melting point (1668 ° C.), so that it is not deteriorated by temperature change during electrode coating and heat treatment by pyrolysis. When titanium is used as an electrode material, the surface of the titanium is anodized by the application of electric current, and a titanium dioxide (TiO₂) layer, which is an oxide film of metal titanium, is formed so that no current flows. Therefore, in order to increase the electrical conductivity by injecting a heterogeneous element into the crystal lattice of the titanium dioxide oxide film, raw materials such as iridium, ruthenium, tin, molybdenum, tantalum, and zirconium are added.

Meanwhile, a high temperature alloy such as Hastelloy-C may be used among nickel alloys. Nickel alloys also have good corrosion resistance to reducing acids, strong hydrochloric acid, and good processability and weldability.

Meanwhile, the first electrode plates 55, 65, 75 and the second electrode plates 57, 67, 77 are spaced apart by a predetermined interval in a direction orthogonal to the flow direction of the sewage so as to be parallel to the flow direction of the sewage. The first electrode support 51, 61, 71 and the second electrode support 53, 63, 73 are provided on opposite surfaces, respectively. In this case, the first electrode plates 55, 65, 75 and the second electrode plates 57, 67, 77 are alternately provided. The first electrode plates 55, 65, 75 and the second electrode plates 57, 67, 77 receive a power from the power applying unit 20 to substantially electrolyze sewage.

Next, a preferred embodiment of the sewage treatment method according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a flowchart showing a process of treating sewage according to a preferred embodiment of the sewage treatment method according to the present invention.

According to this, first, the user operates the controller 30 to set the current application time and the repetition execution time. (S10) And the external power supply unit 20 receives power from the first electrode assembly 50 (+) Current is applied to the first electrode support 51, and (−) current is applied to the second electrode support 73 of the third electrode assembly 70. As a current is applied to the second electrode, a negative current is charged to the second electrode support 53 of the first electrode assembly 50 provided therebetween, and the first electrode support of the second electrode assembly 60 is charged. The positive electrode 61 is charged with a positive current, the negative electrode is charged with a second electrode support 63 of the second electrode assembly 60, and the first electrode support of the third electrode assembly 70 is charged with a positive current. At 73, a positive current is charged. The first electrode plates 55, 65, 75 and the second electrode plates 57, 67, 77 of the electrode assemblies 50, 60, and 70 that are applied with electric current start electrolysis of the sewage (S30). The controller 30 compares a preset time with a current time to determine whether a current is applied for a predetermined time. (S40) When the controller 30 is applied with a current for a predetermined time, the relay unit 35 Control to change the current direction (S50).

The current direction is changed by the relay unit 35 so that a negative current is applied to the first electrode support 51 of the first electrode assembly 50, and the second electrode support of the third electrode assembly 70 is applied. 73 is applied to the second electrode support 53 of the first electrode assembly 50 provided with a positive current therebetween, and a positive current is charged to the second electrode support 53 of the second electrode assembly 60. The electrode support 61 is charged with a negative current, the second electrode support 63 of the second electrode assembly 60 is charged with a positive current, and the first electrode of the third electrode assembly 70 is charged. The electrode support 73 is charged with a negative current. The first electrode plates 55, 65, 75 and the second electrode plates 57, 67, 77 of the electrode assemblies 50, 60, and 70 receiving the reversed current start electrolysis of sewage. (S15) By changing the direction of the current, foreign matter that has been stuck to the first electrode plates 55, 65, 75 and the second electrode plates 57, 67, 77 is peeled off.

The controller 30 determines the repetition execution time. If it is determined that the controller 30 has not exceeded the predetermined time, the controller 30 converts the direction of the current (S70). If the controller 30 determines that the current has exceeded the predetermined time, the controller 30 controls the operation to block the current. (S80, 90) The foreign substances peeled off from the first electrode plates 55, 65, 75 and the second electrode plates 57, 67, 77 are precipitated.

Within the scope of the basic technical spirit of the present invention, many other modifications are possible to those skilled in the art, and the scope of the present invention should be interpreted based on the appended claims. something to do.

As described in detail above, according to the sewage treatment apparatus and the sewage treatment method using the same according to the present invention, the following effects can be expected.

In the present invention, the current is reversed at a predetermined time interval and the negative electrode and the positive electrode are reversed and applied to the electrode plate, thereby easily removing foreign substances adhering to the electrode plate. Therefore, there is an effect of increasing the efficiency of the electrode plate.

In the present invention, since foreign matters are not fixed to the electrode plate, overvoltage caused by foreign matters sticking to the electrode plate is prevented, so that sewage can be treated more economically.

Claims (10)

The electrolyzer where the sewage flows, At least one pair of electrode assemblies for electrolyzing sewage flowing through the electrolytic cell, A power applying unit for applying current to the electrode assembly, and And a controller configured to control the current applied from the power applying unit to be alternately supplied to the electrode assembly at predetermined time intervals. The electrode assembly includes a first electrode support provided with a plurality of first electrode plates, which are titanium electrode plates, and a second electrode support provided with a plurality of second electrode plates, which are titanium or nickel alloy electrode plates. The support and the second electrode support are provided to be spaced apart by a predetermined interval in the flow direction of the sewage to be orthogonal to the flow direction of the sewage, the first electrode plate and the second electrode plate is parallel to the flow direction of the sewage flow direction of the sewage Sewage treatment apparatus, characterized in that provided in the first electrode support and the second electrode support respectively spaced apart by a predetermined interval in the direction orthogonal to the. The method of claim 1, The first electrode plate includes an iridium (Ir) compound, ruthenium (Ru) compound, tin (Sn) compound, manganese (Mn) compound, titanium (Ti) compound, molybdenum (Mo) compound, tantalum (Ta) compound, zirconium ( Zr) Sewage treatment apparatus characterized in that at least one selected from the compound is coated. The method of claim 2, Sewage treatment apparatus, characterized in that the material of the first electrode support and the second electrode support is titanium. delete delete The method of claim 3, wherein The first electrode plate and the second electrode plate is sewage treatment apparatus characterized in that each provided on the surface facing each other alternately in a direction orthogonal to the flow direction of the sewage. The method of claim 6, The electrode assembly is composed of a plurality provided in the electrolytic cell, The controller applies a current in a different direction to any one of the first electrode support or the second electrode support and the second electrode support or the first electrode support of the pair of electrode assemblies that are most spaced apart among the electrode assemblies. The sewage treatment apparatus of claim 1, wherein the first and second electrode supports of the other electrode assembly provided therebetween are electrically charged to alternately polarize each other. A sewage treatment apparatus for electrolyzing sewage flowing through an electrolytic cell by applying power to at least one electrode assembly: (A) controlling the controller to electrolyze sewage by applying a current in one direction to the electrode assembly of any one of claims 1 to 3, 6 and 7; (B) controlling the controller to electrolyze sewage by applying a current in the opposite direction to the electrode assembly; (C) the controller controlling the steps (A) and (B) to be repeatedly performed; And (D) sewage treatment method characterized in that it comprises the step of discharge of the sewage electrolyzed sewage filtered in step (C). The method of claim 8, Step (B) is, (B1) detecting, by the controller, a time when a current in one direction is applied to the electrode assembly in step (A); (B2) the controller comparing the time detected in the step (B1) with a preset time, and (B3) the sewage treatment method comprising the step of applying the current in the opposite direction only when the time detected by the controller in step (B2) exceeds a predetermined time. The method of claim 9, The sewage treatment method characterized in that the current is cut off only when the steps (B) and (C) are repeated for a predetermined time.

Images