Advanced Wastewater Treatment System with Improved Treatment Efficiency Using a Fenton Oxidation Process

Abstract

The present invention comprises: a flow rate adjustment tank; an anaerobic tank for removing phosphorus from the water to be treated flowing in from the flow rate adjustment tank; an anoxic tank for removing nitrate nitrogen from the water to be treated flowing in from the anaerobic tank; an aerobic tank for nitrifying ammonia nitrogen into nitrate nitrogen by aerating air into the water to be treated flowing in from the anoxic tank; a Fenton oxidation unit for treating the water to be treated flowing in from the aerobic tank with Fenton oxidation; and a sedimentation tank for separating the water to be treated flowing in from the Fenton oxidation unit into supernatant and sludge. The Fenton oxidation unit (10) includes an angle adjustment unit (130) for adjusting the inclination angle of a blade (120), so that a stable mixing state can be maintained even when a change in flow velocity occurs, thereby providing excellent removal effects of organic matter, nutrients (nitrogen and phosphorus), and pollutants in wastewater with a low C / N ratio, while also enabling economical and efficient treatment of high-concentration nitrogen-containing wastewater through device miniaturization and cost reduction effects.

Description

Technology Field

[0001] The present invention relates to an advanced wastewater treatment system, and more specifically, to an advanced wastewater treatment system with improved treatment efficiency using a Fenton oxidation reaction, which can economically treat high-concentration nitrogen-containing sewage efficiently through device miniaturization and cost reduction while having excellent removal effects of organic matter and nutrients from wastewater with a low C / N ratio. Background Technology

[0002] Recently, as eutrophication caused by nutrients in urban sewage, village sewers, and wastewater has become severe in rivers, coastal seas, and lakes (lakes and reservoirs), the treatment of nutrients is necessary as a countermeasure.

[0003] Methods for removing nitrogen and phosphorus from wastewater can be divided into physical and chemical methods and biological methods. Physical and chemical methods require high economic costs due to the use of treatment facilities and chemicals.

[0004] Therefore, many biological treatment methods utilizing economical microorganisms have been developed. However, these biological treatment methods face significant challenges in addressing issues such as retention time, site area, nitrogen and phosphorus treatment efficiency, and the ability to cope with fluctuations in influent load when treating domestic wastewater with low C / N ratios.

[0005] To address these issues, modifications to existing nitrogen and phosphorus treatment processes (such as Badenfo, A2 / O, UCT, and VIP) and processes utilizing media are being developed. Nitrogen and phosphorus treatment processes using media can reduce retention time, decrease installation area, and reduce sludge generation during wastewater treatment by utilizing high concentrations of microorganisms attached to the media. In particular, treatment processes using flotation media have a significant advantage over other fluidized bed media and fixed-bed media due to the low unit cost of the media, and stable treated water quality can be achieved through the simultaneous occurrence of biological decomposition and physical filtration.

[0006] The most critical aspect of operating a treatment facility using flotation media is the backwashing method. Currently, backwashing is performed using air, water, or propellers. The air-based backwashing method requires high power consumption as it involves injecting high-pressure air via blowers and compressors, while the water-based backwashing method has the disadvantage of consuming an excessive amount of water. These air or water-based backwashing methods require a large lower space to accommodate the expansion of the media. Additionally, the propeller-based backwashing method, which is generally used in conjunction with water, also incurs high power costs.

[0007] Generally, treatment facilities using flotation media are designed to remove organic matter and suspended solids, but the removal of nitrogen and phosphorus is only 20 to 30 percent, which is the level achieved through the assimilation of microorganisms. Therefore, treatment facilities for organic matter, nitrogen, and phosphorus using flotation media are still inadequate. Furthermore, a problem is emerging that reduces treatment efficiency because it is difficult to take timely and appropriate situational measures due to the inability to monitor the real-time conditions within the filtration tank containing the flotation media. Prior art literature

[0008] Korean Registered Patent No. 10-1634774-0000 (2016.06.23) The problem to be solved

[0009] The objective of the present invention is to provide an advanced wastewater treatment system with improved treatment efficiency using a Fenton oxidation reaction, which enables the efficient and economical treatment of high-concentration nitrogen-containing sewage through device miniaturization and cost reduction, while also providing excellent removal effects of organic matter and nutrients (nitrogen and phosphorus) from wastewater with a low C / N ratio. means of solving the problem

[0010] The technical problem of the present invention as described above is achieved by the following means.

[0011] (1) A flow rate adjustment tank (1); an anaerobic tank (2) for removing phosphorus from the water to be treated flowing in from the flow rate adjustment tank; an anoxic tank (3) for removing nitrate nitrogen from the water to be treated flowing in from the anaerobic tank; an aerobic tank (4) for nitrifying ammonia nitrogen into nitrate nitrogen by aerating air into the water to be treated flowing in from the anoxic tank; a Fenton oxidation unit (10) for Fenton oxidation treatment of the water to be treated flowing in from the aerobic tank; and a sedimentation tank (5) for separating the water to be treated flowing in from the Fenton oxidation unit into supernatant and sludge; comprising,

[0012] The above Fenton oxide section (10) is,

[0013] A reaction tank (70) having a reaction space inside; a water supply unit (71) provided for supplying water to be treated; a Fenton oxide supply unit (72) provided for supplying Fenton oxide; a main supply unit (73) provided for supplying water to be treated and Fenton oxide supplied from the water supply unit and the Fenton oxide supply unit to the reaction tank; a stirrer (100) for mixing wastewater in the reaction space; a treated water discharge unit (74) provided for discharging treated water from the reaction tank; a sediment discharge unit (75) provided for discharging settled sludge among the sludge generated during the reaction process in the reaction tank; and a circulation unit (800) provided for circulating a portion of the treated water from the reaction space to the main supply unit; comprising

[0014] The above stirrer (100) is,

[0015] A rotating shaft (110) rotatably provided at the center of the upper part of the reaction vessel so as to be located in the center of the reaction space;

[0016] A plurality of blades (120) coupled to the above-mentioned rotating shaft (110) to form a fluid flow; and

[0017] It includes a rotation drive unit (140) that rotates the above rotation shaft (110), and

[0018] The blade (120) has a blade shaft (122) as its central axis, and the blade shaft (122) is installed to be rotatable about the rotation axis (110).

[0019] The above-mentioned stirrer (100) includes an angle adjustment unit (130) that rotates the blade shaft (122) to adjust the inclination angle of the blade (120), and

[0020] The above angle adjustment unit (130) is,

[0021] An operating space (131) formed inside the above-mentioned rotating shaft (110);

[0022] An operating shaft (132) installed to be movable along the above operating space (131);

[0023] A control drive unit (133) that moves the above operating shaft (132) in the longitudinal direction of the operating space;

[0024] A driven gear (134) installed at the end of the blade shaft (122) of the blade (120);

[0025] A drive block (135) coupled to the above-mentioned operating shaft (132) and moved together with it;

[0026] and a rack gear (136) formed in the drive block (135) to mesh with the driven gear (134);

[0027] The above blade (120) is,

[0028] A first blade (124) and a second blade (126) are arranged on both sides based on the blade shaft (122) and formed to be foldable;

[0029] and a blade original position part (128) that returns the folded first blade (124) and second blade (126) to an unfolded state;

[0030] Includes,

[0031] The above-mentioned first blade (124) and second blade (126) are each composed of a first blade piece (125) and a second blade piece (127) that are segmented into multiple parts and formed to be individually foldable, thereby forming an advanced wastewater treatment system with improved treatment efficiency using a Fenton oxidation reaction.

[0032] (2) In the above (1),

[0033] The above rotational shaft (110) is composed of a plurality of unit shafts (111) interconnected in series, and

[0034] The above operating shaft (132) is characterized by being formed by connecting a plurality of unit shafts (132a) in series, thereby improving the treatment efficiency of the advanced wastewater treatment system using the Fenton oxidation reaction.

[0035] (3) In the above (1),

[0036] The above blade original positioning part (128) includes a torsion spring, and one end of the torsion spring is fixed to the blade shaft (122), and the other end is fixed to the first blade (124) or the second blade (126), characterized by an advanced wastewater treatment system with improved treatment efficiency using a Fenton oxidation reaction. Effects of the invention

[0037] According to the present invention, it is a very useful and effective invention that enables the efficient and economical treatment of high-concentration nitrogen-containing sewage through device miniaturization and cost reduction, while also providing excellent removal effects of organic matter and nutrients from wastewater with a low C / N ratio. Brief explanation of the drawing

[0038] FIG. 1 is a diagram illustrating the overall configuration of an advanced wastewater treatment system according to the present invention, and FIG. 2 is a drawing illustrating a Fenton oxide portion according to the present invention, and FIG. 3 is a drawing illustrating a stirrer according to the present invention, and FIG. 4 is a drawing illustrating a blade and a blade shaft according to the present invention, and FIG. 5 is a drawing illustrating a rotation axis and an angle adjustment unit according to the present invention, and FIG. 6 is a drawing illustrating the operation state of blade inclination angle adjustment according to the present invention, and FIG. 7 is a drawing illustrating a foldable blade and a blade piece according to the present invention. Specific details for implementing the invention

[0039] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiment in which the present invention may be practiced. The following detailed description includes specific details to provide a complete understanding of the present invention. However, those skilled in the art will know that the present invention may be practiced without such specific details.

[0040] In some cases, to avoid obscuring the concept of the present invention, known structures and devices may be omitted or illustrated in the form of a block diagram focusing on the core functions of each structure and device.

[0041] Throughout the specification, when a part is described as "comprising" or "including" a component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, the term "...part" as used in the specification refers to a unit that performs at least one function or operation. Additionally, "one (a or an)," "one," "the," and similar related terms may be used in the context describing the invention (particularly in the context of the following claims) to include both singular and plural forms, unless otherwise indicated in the specification or clearly contradicted by the context.

[0042] In describing the embodiments of the present invention, specific descriptions of known functions or configurations will be omitted if it is determined that such detailed descriptions could unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined in consideration of their functions in the embodiments of the present invention, and these definitions may vary depending on the intentions or practices of the user or operator. Therefore, such definitions should be based on the content throughout this specification.

[0043] Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings.

[0044] As illustrated in FIG. 1, the advanced wastewater treatment system of the present invention comprises an anaerobic tank (2) for removing phosphorus from water to be treated flowing in from a flow rate adjustment tank (1), an anoxic tank (3) for removing nitrate nitrogen from water to be treated flowing in from the anaerobic tank (2), an aerobic tank (4) for nitrifying ammonia nitrogen into nitrate nitrogen by aerating air into water to be treated flowing in from the anoxic tank (3), a Fenton oxidation unit (10) for Fenton oxidation treatment of water to be treated flowing in from the aerobic tank (4), and a sedimentation tank (5) for separating water to be treated flowing in from the Fenton oxidation unit (10) into supernatant and sludge.

[0045] In the present invention, the device configuration excluding the Fenton oxidation unit (10) may be used as is, based on known methods. The following description will focus on the Fenton oxidation unit (10), and a detailed description of other specific device configurations will be omitted.

[0046] As shown in FIG. 2, the Fenton oxidation unit (10) includes a reaction tank (70), a water supply unit (71), a Fenton oxidation material supply unit (72), a main supply unit (73), a stirrer (100), a treated water discharge unit (74), a sediment discharge unit (75), and a circulation unit (800).

[0047] The reaction tank (70) has a reaction space (70a) formed inside, and the water supply unit (71) is provided to supply wastewater.

[0048] And the Fenton oxide supply unit (72) is provided to supply Fenton oxide.

[0049] The main supply unit (73) is provided to supply the water to be treated and the Fenton oxide material supplied from the water to be treated supply unit (71) and the Fenton oxide material supply unit (72) to the reaction tank (70).

[0050] A stirrer (100) is provided to mix wastewater in the reaction space (70a) of the reaction tank (70).

[0051] Additionally, the treated water discharge unit (74) is provided to discharge treated water from the reaction tank (70), and the sediment discharge unit (75) is provided to discharge settled sludge among the sludge generated during the reaction process in the reaction tank (70).

[0052] The circulation unit (800) circulates a portion of the treated water processed in the reaction space (70a) to the main supply unit (73).

[0053] According to this Fenton oxidation unit (10), wastewater to be treated is introduced into the reaction space (70a) of the reactor (70) and at the same time, a Fenton oxidation substance is supplied to treat the wastewater, and the settled sludge is discharged.

[0054] Accordingly, not only can the treatment efficiency of wastewater be improved, but the amount of sludge generated and settled during the treatment process can also be reduced, thereby reducing the cost of sludge treatment.

[0055] And the circulation unit (800) is provided to circulate a portion of the treated water processed in the reaction space (70a) to the main supply unit (73).

[0056] This circulation unit (800) consists of a circulation pipe (810) and a circulation pump (820).

[0057] The inlet end of the circulation pipe (810) is connected to the reaction tank (70), and the outlet end is connected to the main supply unit (73).

[0058] And the circulation pump (820) is for supplying a portion of the treated water to the lower part of the reaction space (70a) through the circulation pipe (810), and is supplied to the lower part of the reaction space (70a) by the main supply unit (73).

[0059] Accordingly, by circulating the circulating treated water, the newly supplied treated water, and the Fenton oxidizing material to the Fenton oxidation unit (10), the removal efficiency of the sludge introduced into the Fenton oxidation unit (10) can be improved.

[0060] As shown in FIG. 3, the stirrer (100) has a plurality of blades (120) and is rotatably provided in the reaction space (70a) to rotate the wastewater and form a vortex. In the present invention, the operation of the stirrer (100) can be controlled through a control unit (not shown) according to changes in the characteristics of the incoming wastewater, and preferably, an artificial intelligence control unit may be applied.

[0061] The stirrer (100) according to the present invention comprises a rotating shaft (110), a plurality of blades (120) coupled to the rotating shaft (110) to form a fluid flow, and a rotary drive unit (140) that rotates the rotating shaft (110). The stirrer (100) is configured to improve the uniformity of mixing of the mixed liquid by forming a mixed flow inside the Fenton oxidation unit (10) through rotation. Accordingly, the stirrer (100) can perform the function of reducing the variation in activated sludge concentration inside the Fenton oxidation unit (10) and suppressing the occurrence of stagnant areas inside the treatment tank.

[0062] Each of the above blades (120) has a blade shaft (122) as shown in FIGS. 3 and 4, and the blade shaft (122) is installed to be rotatable on a rotation axis (110).

[0063] Preferably, the blade shaft (122) is installed in the center of the blade (120) and can be rotatably supported with respect to the rotation axis (110) by a bearing. Accordingly, the blade (120) rotates as a whole by the rotation of the rotation axis (110), while the angle of inclination can be adjusted around the blade shaft (122).

[0064] The above-described stirrer (100) further includes an angle adjustment unit (130) that adjusts the inclination angle of the blade (120) by rotating the blade shaft (122). The angle adjustment unit (130) may include an operating space (131), an operating shaft (132), an adjustment drive unit (133), a driven gear (134), a drive block (135), and a rack gear (136).

[0065] The above operating space (131) is formed inside the rotation shaft (110), and the rotation shaft (110) may have a plurality of unit shafts (111) of a certain length connected in series, and in this case, the operating space (131) formed inside each unit shaft (111) may be formed to be in communication with each other.

[0066] The above operating shaft (132) is installed to be movable along the operating space (131) and may be formed as a single unit or may be formed by connecting a plurality of unit shafts (132a) having a certain length in series. The upper end of the above operating shaft (132) may be formed to protrude upward from the rotation axis (110), and the control drive unit (133) is installed adjacent to the upper end of the rotation axis (110) and configured to move the above operating shaft (132) in the longitudinal direction (or vertical direction) of the operating space (131).

[0067] The above-mentioned driven gear (134) is installed at the end of the blade shaft (122) of each blade (120) and can be positioned within the operating space (131) of the rotation axis (110). The above-mentioned driving block (135) is coupled to the operating shaft (132) and moves together with the operating shaft (132), and can be positioned at a location corresponding to each blade (120) installed on the rotation axis (110).

[0068] In the above-mentioned drive block (135), block protrusions (135a) may be formed protruding on both sides relative to the driven gear (134), and a rack gear (136) that meshes with the driven gear (134) may be formed on the block protrusions (135a).

[0069] As in one embodiment illustrated in FIG. 4, when a plurality of blades (120) are installed radially with respect to a rotation axis (110), a plurality of block protrusions (135a) corresponding to each blade (120) may be formed on the outer circumference of the drive block (135), and a rack gear (136) formed on each block protrusion (135a) may mesh with a corresponding driven gear (134). Accordingly, the inclination angle of the plurality of blades (120) can be adjusted simultaneously or in conjunction by the movement of a single operating shaft (132).

[0070] When looking at the operating state of the angle adjustment unit (130) as shown in FIG. 5, when the operating shaft (132) moves along the operating space (131) by the adjustment drive unit (133), the drive block (135) coupled to the operating shaft (132) moves together. At this time, the rack gear (136) of the drive block (135) moves linearly, and the driven gear (134) engaged with the rack gear (136) rotates, and the blade shaft (122) rotates according to the rotation of the driven gear (134), thereby adjusting the inclination angle of the blade (120). Accordingly, the agitator (100) can adjust the direction of fluid agitation and the agitation intensity according to changes in the characteristics and flow rate of the wastewater.

[0071] In addition, the blade (120) may be configured to variably form a flow state in response to changes in fluid resistance by means of a folding structure of the first blade (124) and the second blade (126). Accordingly, a stable mixing state can be maintained even when changes in the viscosity of wastewater or the flow velocity of the mixed liquid occur, and the formation of local stagnation areas can be reduced.

[0072] Each of the above blades (120) may include a first blade (124), a second blade (126), and a blade original position portion (128), as shown in FIGS. 4 and 6. The first blade (124) and the second blade (126) may be positioned on both sides relative to the blade shaft (122) and may be formed to be foldable according to fluid resistance.

[0073] The above blade original position part (128) is an elastic configuration and performs the function of returning the folded first blade (124) and second blade (126) to an unfolded state (or restoring the position by restoring force).

[0074] Here, the blade return portion (128) uses a torsion spring as shown in FIG. 4 in one embodiment, and one end of the torsion spring is fixed to the blade shaft (122) and the other end is fixed to the first blade (124) or the second blade (126), and is returned to its original position by a force that returns it to its original state after being folded according to the degree of fluid resistance.

[0075] That is, the first blade (124) and the second blade (126) can repeat folding and returning operations based on the blade shaft (122) according to the flow velocity, viscosity, and sludge concentration of the wastewater when the stirrer (100) rotates. Since the flow state inside the treatment tank can be formed more diversely through this folding and returning operation, it can contribute to improving the uniformity of mixing inside the aerobic tank (4) and reducing localized sludge deposition.

[0076] Additionally, as illustrated in FIG. 7, the first blade (124) and the second blade (126) may be composed of a plurality of blade segments (125, 127). Each of the plurality of blade segments (125, 127) is formed to be individually foldable and can be returned to its original state by the blade original position part (128). Accordingly, instead of the entire blade being deformed uniformly, individual folding and return can be achieved for each part where fluid resistance is significant, thereby improving responsiveness to changes in wastewater characteristics.

[0077] In this way, the stirrer (100) of the present invention can variably form a mixed flow inside the treatment tank by means of a combination of a rotating shaft (110), a blade (120), an angle adjustment part (130), a first blade (124), a second blade (126), and a first blade piece (125) and a second blade piece (127). Accordingly, the present invention can improve the uniformity of mixing inside the Fenton oxidation part (10) and reduce sludge concentration variation and the occurrence of local stagnation areas.

[0078] As described above, although the present invention has been explained with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the invention as described in the following claims. Explanation of the symbols

[0079] 10: Fenton oxidation unit 70: Reactor 71: Water supply unit for treatment 72: Fenton oxide supply unit 73 : Main supply unit 74 : Treated water discharge unit 75 : Sediment discharge section 100 : Stirrer 110 : Rotating shaft 120 : Blade 130 : Angle adjustment part 140 : Rotary drive unit 800 : Circulation unit

Claims

Claim 1 A flow rate adjustment tank (1); an anaerobic tank (2) for removing phosphorus from the water to be treated flowing in from the flow rate adjustment tank; an anoxic tank (3) for removing nitrate nitrogen from the water to be treated flowing in from the anoxic tank; an aerobic tank (4) for nitrifying ammonia nitrogen into nitrate nitrogen by aerating air into the water to be treated flowing in from the anoxic tank; a Fenton oxidation unit (10) for Fenton oxidation treatment of the water to be treated flowing in from the aerobic tank; and a sedimentation tank (5) for separating the water to be treated flowing in from the Fenton oxidation unit into supernatant and sludge; wherein the Fenton oxidation unit (10) comprises: a reaction tank (70) having a reaction space inside; a water to be treated supply unit (71) provided for supplying water to be treated; a Fenton oxidation material supply unit (72) provided for supplying Fenton oxidation material; and a main supply unit (73) provided for supplying the water to be treated and the Fenton oxidation material supplied from the water to be treated supply unit and the Fenton oxidation material supply unit to the reaction tank. The apparatus comprises: a stirrer (100) for mixing wastewater in the reaction space; a treated water discharge unit (74) provided for discharging treated water from the reaction tank; a sediment discharge unit (75) provided for discharging settled sludge among the sludge generated during the reaction process in the reaction tank; and a circulation unit (800) provided for circulating a portion of the treated water from the reaction space to a main supply unit; wherein the stirrer (100) comprises: a rotating shaft (110) for transmitting rotational force; and a plurality of blades (120) coupled to the rotating shaft (110) to form a fluid flow. and a rotary drive unit (140) for rotating a plurality of blades by rotating the rotary shaft (110); wherein the blade (120) has a blade shaft (122) as a central axis, and the blade shaft (122) is installed to be rotatable with respect to the rotary shaft (110); and the stirrer (100) includes an angle adjustment unit (130) for adjusting the inclination angle of the blade (120), wherein the angle adjustment unit (130) comprises: an operating space (131) formed inside the rotary shaft (110); and an operating shaft (132) installed to be movable along the operating space (131).The device comprises: a control drive unit (133) for moving the operating shaft (132) in the longitudinal direction of the operating space; a driven gear (134) installed at the end of the blade shaft (122) to rotate the blade shaft; a drive block (135) coupled to the operating shaft (132) and moving together with it; and a rack gear (136) formed on the drive block (135) to mesh with the driven gear (134); wherein a plurality of blades (120) are installed radially with respect to the rotation axis (110), and a plurality of block protrusions (135a) corresponding to each blade are formed on the outer circumference of the drive block (135), and the rack gear (136) formed on each block protrusion meshes with the corresponding driven gear (134), and the blades (120) include a first blade (124) that is arranged on both sides with respect to the blade shaft (122) and is formed to be foldable, and A high-grade wastewater treatment system with improved treatment efficiency using a Fenton oxidation reaction, comprising: a second blade (126); and a blade return section (128) for returning the folded first blade (124) and second blade (126) to an unfolded state; wherein the first blade (124) and second blade (126) are each composed of a first blade section (125) and a second blade section (127) formed to be individually foldable by being segmented into multiple parts; the rotation shaft (110) is formed by a plurality of unit shafts (111) being interconnected in series; the operating shaft (132) is formed by a plurality of unit shafts (132a) being connected in series; and the blade return section (128) includes a torsion spring, wherein one end of the torsion spring is fixed to the blade shaft (122) and the other end is fixed to the first blade (124) or the second blade (126). Claim 2 delete Claim 3 delete

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