Aeration system

Abstract

To provide an aeration system capable of efficiently improving water quality in deep water areas of various water bodies and / or water treatment facilities.SOLUTION: An aeration system of the present invention comprises sludge water, a rotating shaft arranged along a vertical direction, and at least one flow member attached to the rotating shaft. Here, the liquid flow member includes a discharge portion located above a liquid surface of the sludge water, a liquid suction portion located below the liquid surface of the sludge water, and a cylindrical flow path extending between the discharge portion and the liquid suction portion, and a solid concentration in the sludge water is 0.1 mass % or more and 20 mass % or less based on a mass of the sludge water.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an aeration system, and more particularly to an aeration system for improving water quality by increasing the amount of dissolved oxygen.

Background Art

[0002] In recent years, for the conservation of water area environments such as dams, lakes, rivers, ponds, and seas, in water treatment facilities such as sewage treatment plants and night soil treatment plants, efforts have been made to purify domestic wastewater and sewage (hereinafter, these may be collectively referred to as "treated wastewater, etc.") with activated sludge. Activated sludge is a general term for floating organic sludge containing aerobic microorganisms, and is activated by increasing the dissolved oxygen concentration in the water area to be treated.

[0003] For the purification of treated wastewater, etc. using activated sludge, devices or systems have been proposed that increase the dissolved oxygen concentration by forcibly bringing air into contact with the treated wastewater, etc. These are called aeration devices or aeration systems.

[0004] For example, Patent Document 1 describes an aeration device including a diffuser tube through which compressed air is sent from a compressor via an air supply hose, and a main body that circulates the upward flow generated by the bubbles of the compressed air released from the diffuser tube in the deep layer. However, such an aeration device requires a relatively large-scale mechanism for supplying compressed air to the deep layer of the water area. Also, a huge amount of energy is required for continuous operation.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention aims to solve the above problems, and its object is to provide an aeration system capable of efficiently improving the water quality in the deep parts of various water areas and / or water treatment facilities.

Means for Solving the Problems

[0007] The present invention is an aeration system comprising sludge water, a rotating shaft arranged along the vertical direction, and at least one liquid-flowing member attached to the rotating shaft, wherein the liquid-flowing member includes a discharge portion located above the liquid surface of the sludge water, a liquid-absorbing portion located below the liquid surface of the sludge water, and a cylindrical flow path extending between the discharge portion and the liquid-absorbing portion, and the solid content concentration in the sludge water is 0.1 mass% or more and 20 mass% or less based on the mass of the sludge water, which is the aeration system.

[0008] In one embodiment, the liquid-dispersing member is arranged to be inclined such that the liquid-absorbing portion is located closer to the axis of the rotating shaft than the discharge portion with respect to the axis of the rotating shaft.

[0009] In one embodiment, the liquid-dispersing member has a cylindrical shape and is bent.

[0010] In a further embodiment, the angle θ between the direction in which the discharge portion is directed and the horizontal direction 2 is -90° ≤ θ 2 ≤ 20° with respect to the horizontal direction.

[0011] In one embodiment, a motor is connected to one end of the rotating shaft.

[0012] In one embodiment, the motor is connected to the lower end of the rotating shaft.

[0013] In one embodiment, the motor is connected to the upper end of the rotating shaft.

Advantages of the Invention

[0014] According to the present invention, it is possible to efficiently aerate deep water portions of various water areas and / or sludge water in water treatment facilities with less energy.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0016] The present invention will be described with reference to the accompanying drawings. In all the following drawings, components denoted by the same reference numerals are the same as those shown in other drawings.

[0017] (A) Aeration System FIG. 1 is a schematic diagram showing an example of the aeration system of the present invention.

[0018] The aeration system 100 of the present invention includes sludge water 104, a rotating shaft 130, and a liquid flow member 120.

[0019] (Sludge Water) The sewage sludge 104 contains activated sludge, together with domestic wastewater, industrial wastewater, rainwater, sewage, lake water, river water, and seawater, and combinations thereof (which may be referred to as "wastewaters"). The activated sludge contains an aerobic microbial group composed of biological species such as bacteria, fungi, protozoa, and metazoans, and plays a role in decomposing or absorbing organic substances and / or inorganic salts, which are water pollutants contained in the wastewaters, for purification.

[0020] In the present invention, the solid content concentration of the sewage sludge 104 is 0.1% by mass or more and 20% by mass or less, preferably 1% by mass or more and 17% by mass or less, based on the total mass. When the solid content concentration of the sewage sludge 104 is less than 0.1% by mass, it may be difficult to actually feel whether the activated sludge functions effectively to purify the wastewaters even when such sewage sludge is aerated. When the solid content concentration of the sewage sludge 104 exceeds 20% by mass, the viscosity of the sewage sludge itself increases, and the fluidity within the liquid flow member 120 constituting the present invention may be impaired.

[0021] (Rotating shaft) The rotating shaft 130 is a single shaft having a predetermined rigidity arranged along the vertical direction, and has, for example, a cylindrical or columnar shape. The thickness of the rotating shaft 130 is not necessarily limited, but is, for example, 8 mm to 200 mm. The length of the rotating shaft 130 varies depending on the size of the liquid flow member 120 to be used, etc., and an appropriate length can be selected by those skilled in the art.

[0022] One end of the rotating shaft 130 is connected to a rotating means such as a motor 140. In FIG. 1, the motor 140 is provided on the upper end side of the rotating shaft 130. Further, in FIG. 1, a housing 108 connected to an arm 106 extending from the outside is provided on the outer periphery of the motor 140. Thereby, the motor 140 is fixed so as to be located above the liquid surface 180 of the sewage sludge 104.

[0023] On the other hand, in FIG. 1, an attachment 132 extending horizontally is attached to the other end of the rotation shaft 130, and the liquid flow member 120 is disposed via the attachment 132. In order to avoid the generation of unnecessary resistance during rotation, usually, this attachment 132 is disposed above the liquid surface 180.

[0024] (Liquid flow member) The liquid flow member 120 is composed of, for example, two members having the same shape, and the liquid flow member 120 is symmetrically disposed around the axis of the rotation shaft 130. The number of the liquid flow members 120 constituting the aeration system 100 of the present invention is not particularly limited. The liquid flow member 120 is composed of at least one, preferably at least two, more preferably two, three, four, five or six. When the aeration system 100 includes a plurality of liquid flow members 120, each liquid flow member is preferably arranged so that the angle between one liquid flow member and another adjacent liquid flow member around the axis of the rotation shaft 130 is substantially equal in order to maintain smooth rotation by the rotation shaft 130.

[0025] FIG. 2 is a perspective view showing an example of the liquid flow member 120 constituting the aeration system 100 shown in FIG. 1. The liquid flow member 120 shown in FIG. 2 has a cylindrical form.

[0026] The liquid flow member 120 includes a liquid absorption part 124, a flow path 126, and a discharge part 125 in that order from below to above.

[0027] The liquid absorption part 124 is provided for introducing the sludge water 104 existing around the liquid absorption part 124 into the flow path 126 of the liquid flow member 120 by the rotation of the rotation shaft 130 shown in FIG. 1. Here, in the present invention, the liquid flow member 120 is arranged such that the liquid absorption part 124 is located below the liquid surface 180 of the sludge water 104 in both a state where the rotation shaft 130 is not rotating (stationary state) and a state where the rotation shaft 130 is rotating.

[0028] The shape of the liquid absorption part 124 is not particularly limited. Examples of the shape of the liquid absorption part 124 include a circle, an ellipse, a triangle, a rectangle, and other polygons, as well as the gutter-shaped cross-sectional shape (for example, an arc shape) described later. Note that the liquid absorption part 124 may have an expanded opening area by being cut from an oblique direction with respect to the axis of the liquid flow member 120 so that more contaminated muddy water 104 can be introduced into the liquid flow member 120.

[0029] The size of the liquid absorption part 124 is not particularly limited. For example, when the liquid absorption part 124 has a circular cross-sectional shape, its outer diameter is, for example, 10 cm to 200 cm.

[0030] The discharge part 125 is provided to discharge the contaminated muddy water 104 introduced into the flow path 126 of the liquid flow member 120 outward through the rotation of the rotation shaft 130 shown in FIG. 1. Here, in the present invention, the liquid flow member 120 is arranged such that the discharge part 125 is located on the liquid surface 180 of the contaminated muddy water 104 in both a state where the rotation shaft 130 is not rotating (stationary state) and a state where the rotation shaft 130 is rotating.

[0031] The shape of the discharge part 125 is also not particularly limited. Examples of the shape of the discharge part 125 include a circle, an ellipse, a triangle, a rectangle, and other polygons, as well as the gutter-shaped cross-sectional shape (for example, an arc shape) described later.

[0032] Note that the inner diameter of the liquid flow member 120 may be constant from, for example, the liquid absorption part 124 to the discharge part 125, or may gradually or stepwise decrease in diameter.

[0033] Referring to FIG. 1 again, in the aeration system 100 of the present invention, it is preferable that the flow path 126 in the liquid flow member 120 is inclined such that the liquid absorption part 124 is located closer to the proximal side than the discharge part 125 with respect to the axial direction L of the rotation shaft 130. In other words, the flow path 126 in the liquid flow member 120 is preferably inclined at a predetermined mounting angle θ 1 with respect to the axial direction L of the rotation shaft 130. The mounting inclination angle θ1 The mounting inclination angle θ can be set at any angle by those skilled in the art, for example, 5° to 60°, preferably 10° to 45°. 1 When the mounting inclination angle θ is within such an angular range, the sludge water 104 scooped up from the liquid absorption part 124 of the liquid flowing member 120 moves upward from below in the flow path 126 by centrifugal force through the rotation of the rotation shaft 130, and can be efficiently discharged outward from the discharge port 125.

[0034] (Material) In the present invention, the liquid flowing member 120, the rotation shaft 130, and the fixture 132 are each independently made of a material such as a resin material such as vinyl chloride resin, fiber reinforced plastic (FRP), Teflon (registered trademark); metals such as iron, stainless steel, Hastelloy, titanium, aluminum; and combinations thereof. Further, in order to enhance the durability, one or more of the liquid flowing member 120 and the rotation shaft 130 may be provided with a coating known in the art such as PTFE, glass lining, or rubber lining.

[0035] (Function) In the aeration system 100 shown in FIG. 1, when the rotation shaft 130 rotates by driving the motor 140, the liquid flowing member 120 also rotates accordingly. At that time, the sludge water 104 is scooped up from the liquid absorption part 124 of the liquid flowing member 120. Thereafter, the scooped-up sludge water moves upward from below in the flow path 126 by centrifugal force through the inclination and rotation of the liquid flowing member 120, and is finally discharged as it is outward in the rotation direction from the discharge port 125. In the rotating liquid flowing member 120, the scooping up of the liquid absorption part 124 and the discharge from the discharge port 125 are continuously performed, for example, so that the sludge water 104 moves upward from below while rotating spirally below the liquid flowing member 120. As a result, the circulation of the stored sludge water 104 is promoted, and aeration can be performed smoothly.

[0036] (B) Other aeration systems (1) FIG. 3 is a schematic view showing another example of the aeration system of the present invention.

[0037] In the aeration system 200 shown in FIG. 3, a frame portion 110 is provided below the motor 140 in place of the arm 106 and the housing 108 shown in FIG. 1.

[0038] The frame portion 110 itself can float on the liquid surface 180 of the sewage sludge water 104, whereby each of the liquid flow member 120 and the rotating shaft 130 can be arranged below or above the liquid surface 180 of the sewage sludge water 104.

[0039] In FIG. 3, the frame portion 110 has, for example, a cup-shaped form having an open window 112, and a float 113 is provided at the open end portion. The float 113 has, for example, an annular form with a central opening. The inside of the float 113 is hollow and sealed, and a substance having a lower density than water (for example, a gas such as air or nitrogen gas) is accommodated therein. Alternatively, the inside of the float 113 may be filled with a foamed resin having a density lower than that of water or seawater, such as polystyrene foam, or may be composed of the foamed resin. Thereby, the frame portion 110 on the float 113 can float on the liquid surface 180.

[0040] The open window 112 is provided for free movement of air inside and outside the frame portion 110 and for spreading the sewage sludge water 104 discharged from the discharge portion 125 of the liquid flow member 120 to the outside.

[0041] Furthermore, a solar panel 114 electrically connected to the motor 140 described later may be disposed on the outer surface of the frame portion 110. Alternatively, the solar panel 114 may be electrically connected to the motor 140 via a storage battery (not shown).

[0042] The above-described frame portion 110 is also composed of materials such as metals including iron, stainless steel, Hastelloy, titanium, aluminum, and combinations thereof. Further, in order to enhance durability, the outer surface and / or the inner surface may be provided with coatings known in the art such as PTFE, glass lining, or rubber lining.

[0043] Since the aeration system 200 of the present invention has the configuration shown in FIG. 3, the motor 140, the rotating shaft 130, and the liquid flow member 120 can perform aeration while floating on the liquid surface 180 of the sludge water 104.

[0044] In the aeration system 200 shown in FIG. 3, when the rotating shaft 130 rotates due to the drive of the motor 140, the liquid flow member 120 rotates accordingly. At this time, the sludge water 104 is scooped up from the liquid suction portion 124 of the liquid flow member 120. Thereafter, the scooped-up sludge water moves upward from below in the flow path 126 by centrifugal force through the inclination and rotation of the liquid flow member 120, and is finally discharged as it is outward in the rotation direction from the discharge port 125. In the rotating liquid flow member 120, such scooping up by the liquid suction portion 124 and discharging from the discharge port 125 are performed continuously, for example, so that the sludge water 104 rotates in a spiral shape and moves upward from below below the liquid flow member 120. As a result, the circulation of the stored sludge water 104 is promoted, and aeration can be performed smoothly. In the embodiment shown in FIG. 3, such aeration is performed while floating on the liquid surface 180 of the sludge water 104 via the frame portion 110.

[0045] (C) Other Aeration System (2) FIG. 4 is a schematic diagram showing another example of the aeration system of the present invention.

[0046] In the aeration system 300 shown in FIG. 4, the motor 340 is housed in a waterproof housing 308, is disposed below the liquid surface 180 of the sludge water 104 (that is, in the sludge water 104), and is connected to the lower end of the rotating shaft 330. Thereby, the rotating shaft 330 is designed to be long corresponding to the depth of the sludge water 104.

[0047] In the aeration system 300 shown in FIG. 4, only the liquid flow member 120 (a part thereof), the rotating shaft 330, and the fixture 132 are exposed on the liquid surface of the sludge water 104. Therefore, it can present a completely different appearance from the aeration systems 100 and 200 shown in FIGS. 1 and 3 above.

[0048] In the aeration system 300 shown in FIG. 4, when the rotating shaft 330 rotates due to the drive of the motor 340, the liquid flow member 120 also rotates accordingly. At that time, the sludge water 104 is scooped up from the liquid suction part 124 of the liquid flow member 120. Then, the scooped-up sludge water moves upward from the bottom in the flow path 126 by centrifugal force through the inclination and rotation of the liquid flow member 120, and is finally discharged as it is outward in the rotation direction from the discharge port 125. In the rotating liquid flow member 120, for example, such scooping up of the liquid suction part 124 and discharging from the discharge port 125 are continuously performed, so that the sludge water 104 rotates in a spiral shape and moves upward from the bottom below the liquid flow member 120. As a result, the circulation of the stored sludge water 104 is promoted, and aeration can be performed smoothly.

[0049] (D) Other aeration system (3) FIG. 5 is a schematic view showing another example of the aeration system of the present invention.

[0050] In the aeration system 400 shown in FIG. 5, except that a liquid flow member 120' with a part bent is adopted instead of the liquid flow member 120 shown in FIG. 1, the rest is the same as the aeration system 100 shown in FIG. 1.

[0051] The liquid flow member 120' has a cylindrical form and is bent at at least a part of the flow path 126' (as shown by the bent part P in FIG. 5). For example, in the liquid flow member 120', the discharge part 125' is directed downward, and as a result, the reaction liquid sucked from the liquid suction part 124' of the liquid flow member 120' is discharged from the discharge part 125' downward toward a position lower than the height of the discharge port 125' of the liquid flow member 120'.

[0052] FIG. 6 is a longitudinal sectional view schematically showing an example of the liquid flow member 120' constituting the aeration system 400 shown in FIG. 5.

[0053] For example, when a cylindrical member is used as the liquid flow member 120', its inner diameter is, for example, 2 mm to 200 mm. The length from the liquid absorption part 124' to the bent part P is not particularly limited, and an appropriate length can be selected by those skilled in the art. In FIG. 6, although it is described as if the inner diameter of the liquid absorption part 124', the inner diameter of the passage 126', and the inner diameter of the discharge part 125' are substantially the same size, the present invention is not limited to such a form only. For example, the inner diameter of the liquid flow member 120' may gradually or stepwise decrease from the liquid absorption part 124' through the bent part P toward the discharge part 125'.

[0054] Furthermore, in the liquid flow member 120' shown in FIG. 6, the angle θ between the direction T in which the discharge part 125' points and the horizontal direction H 2 is, based on the horizontal direction, for example, -90° ≤ θ 2 ≤ 20°, and as another example, -90° ≤ θ 2 < 0°, or as yet another example, -60° ≤ θ 2 ≤ -1°. When the angle θ 2 is less than -90°, the reaction liquid may flow backward in the liquid flow member, and the sludge water may not be effectively discharged from the discharge part. When the angle θ 2 exceeds 20°, even if the flow path 126' is filled with sludge water through the rotation of the rotating shaft, more energy (energy due to the rotation of the rotating shaft) may be required to discharge from the discharge port 124'.

[0055] Referring to FIG. 5 again, in the aeration system 400, by rotating the rotating shaft 130 through the drive of the motor 140, the sludge water 104 is sucked from the liquid absorption port 124' of the liquid flow member 120'. The sucked sludge water moves to the discharge port 125' through the cylindrical passage 126' by the centrifugal force accompanying the rotation of the rotating shaft 130, and is discharged from the discharge port 125'. Here, in the liquid flow member 120' shown in FIG. 6, the angle θ between the direction T in which the discharge part 125' points and the horizontal direction H2 When it is less than 0° with respect to the horizontal direction, if the rotation of the rotating shaft 130 continues and the inside of the flow path 126’ is completely filled with sludge water, a “syphon-like” movement of the sludge water becomes possible between the liquid suction part 124’, the flow path 126’ and the discharge part 125’. At this time, even if the rotation speed of the rotating shaft 130 is decreased, this “syphon-like” phenomenon continues due to hysteresis. As a result, with the energy required for the rotation of the rotating shaft 130 suppressed, the sludge water scooped up from the liquid suction part 124’ can be discharged as it is from the discharge port 125’ outward in the rotation direction. In the rotating liquid flow member 120’, such scooping up by the liquid suction part 124’ and discharge from the discharge port 125’ are, for example, continuously performed with less additional rotational energy, so that the sludge water 104 moves upward from below while rotating spirally below the liquid flow member 120’.

[0056] In the present invention, the liquid flow member 120’ is made of the same material as the liquid flow member 120 shown in FIG. 1.

[0057] (E) Other aeration systems (4) FIG. 7 is a schematic diagram showing another example of the aeration system of the present invention.

[0058] The aeration system 500 shown in FIG. 7 is the same as the configuration of the liquid flow member 120 shown in FIG. 1 except that a gutter-shaped liquid flow member 520 is used instead of the cylindrical liquid flow member 120 shown in FIG. 1.

[0059] The liquid flow member 520 in the aeration system 500 has, for example, a semi-cylindrical flow path 526 as shown in FIG. 8, and a liquid suction part 524 and a discharge part 525 provided at both ends of the flow path 526. The material that can constitute the liquid flow member 520 is the same as that of the liquid flow member 120 shown in FIG. 1.

[0060] Referring again to FIG. 7, in the aeration system 500 shown in FIG. 7, when the rotary shaft 130 rotates due to the drive of the motor 140, the liquid flow member 520 also rotates accordingly. At this time, the sludge water 104 is scooped up from the liquid suction part 524 of the liquid flow member 520. Then, the scooped-up sludge water moves upward from the bottom in the flow path 526 by centrifugal force through the inclination and rotation of the liquid flow member 520, and is finally discharged as it is outward in the rotation direction from the discharge port 525. In the rotating liquid flow member 520, for example, such scooping up by the liquid suction part 524 and discharging from the discharge port 525 are continuously performed, so that the sludge water 104 rotates in a spiral shape and moves upward from the bottom below the liquid flow member 520. As a result, the circulation of the stored sludge water 104 is promoted, and aeration can be performed smoothly.

Example

[0061] Hereinafter, the present invention will be described in detail with reference to examples. However, the present invention is not limited thereto.

[0062] (Example 1: Fabrication of Aeration System) First, a test machine 670 shown in FIG. 9 was fabricated as follows. Specifically, two cylindrical stainless steel pipes (inner diameter 10 mm, length 86 mm) 620a and 620b, a part of which near the discharge parts 625a and 625b is bent, were fixed in a V shape with a fixture 632 having a diameter of 8 mm so as to face each other and be inclined by 20° with respect to the axial direction of the rotary shaft 630. The distance from the discharge part 625a of one pipe 620a to the discharge part 625b of the other pipe 620b was 112 mm.

[0063] This test machine 670 was placed in an acrylic resin square tank 650 having a bottom surface of 150 mm × 150 mm containing model sludge water. At this time, the test machine 670 was fixed at a position immersed in the model sludge water 640 until it reached a height of 81 mm vertically from the liquid suction parts 624a and 624b of the pipes 620a and 620b in a stationary state. Thereby, a test aeration system 600 was fabricated.

[0064] (Example 2: Evaluation of the Discharge Performance of the Aeration System Using Model Sewage Sludge (1)) When the aeration system 600 prepared in Example 1 contained model sewage sludge having a solid concentration of 10% by mass (diluted "sea mud pack" manufactured by Fifty Visionary Co., Ltd. with a predetermined amount of water), the rotation shaft 630 was rotated at respective rotation speeds of 200 rpm, 250 rpm, 300 rpm, 350 rpm, 400 rpm, and 450 rpm, and it was visually confirmed whether the model sewage sludge was discharged from the discharge portions 625a, 625b of the pipes 620a, 620b. The results were evaluated and classified based on the following criteria: A. The model sewage sludge was discharged from the discharge portion. B. The model sewage sludge was intermittently discharged from the discharge portion. C. The model sewage sludge was not discharged from the discharge portion.

[0065] The results are shown in Table 1.

[0066] (Example 3: Evaluation of the Discharge Performance of the Aeration System Using Model Sewage Sludge (2)) Except for using model sewage sludge prepared by diluting with water so that the solid concentration was 16% by mass, in the same manner as in Example 2, when the rotation shaft 630 was rotated at various rotation speeds, the state of the model sewage sludge discharged from the discharge portions 625a, 625b of the pipes 620a, 620b was evaluated and classified. The results are shown in Table 1.

[0067] (Example 4: Evaluation of the Discharge Performance of the Aeration System Using Model Sewage Sludge (3)) Except for using model sewage sludge prepared by diluting with water so that the solid concentration was 17% by mass, in the same manner as in Example 2, when the rotation shaft 630 was rotated at various rotation speeds, the state of the model sewage sludge discharged from the discharge portions 625a, 625b of the pipes 620a, 620b was evaluated and classified. The results are shown in Table 1.

[0068] (Example 5: Evaluation of the Discharge Performance of the Aeration System Using Model Sewage Sludge (4)) Except for using the model sewage sludge prepared by diluting with water so that the solid content concentration becomes 18% by mass, in the same manner as in Example 2, the state of the model sewage sludge discharged from the discharge portions 625a and 625b of the pipes 620a and 620b when the rotating shaft 630 was rotated at various rotational speeds was evaluated and classified. The results are shown in Table 1.

[0069] (Example 6: Evaluation of the discharge performance of the aeration system using model sewage sludge (5)) Except for using the model sewage sludge prepared by diluting with water so that the solid content concentration becomes 20% by mass, in the same manner as in Example 2, the state of the model sewage sludge discharged from the discharge portions 625a and 625b of the pipes 620a and 620b when the rotating shaft 630 was rotated at various rotational speeds was evaluated and classified. The results are shown in Table 1.

[0070]

Table 1

[0071] As shown in Table 1, with respect to the model sewage sludge having a solid content concentration of at least 20% by mass, the aeration system 600 fabricated in Example 1 was able to discharge the sewage sludge from the discharge portions 625a and 625b of the pipes 620a and 620b by adjusting the rotational speed of the rotating shaft 630. Therefore, it can be understood that the aeration system of the present invention can promote circulation even with highly viscous sewage sludge and can effectively perform aeration.

Explanation of Reference Numerals

[0072] 100, 200, 300, 400, 500, 600 Aeration system 104 Sewage sludge 106 Arm 108 Housing 110 Frame portion 112 Open window 113 Float 114 Solar panel 120, 120’, 520 Liquid flow member 124, 124’, 524, 624a, 624b Liquid absorption portion 125, 125’, 525, 625a, 625b discharge part 126, 126’, 526 flow path 130, 330, 630 rotation axis 132, 632 fixture 140, 340 motor 180 liquid level 620a, 620b pipe 640 model contaminated sludge 670 testing machine

Claims

1. An aeration system comprising: The apparatus includes: sludge water; a rotating shaft arranged along a vertical direction; and at least one liquid flow member attached to the rotating shaft; the liquid flow member includes a discharge portion located above the liquid surface of the sludge water, a liquid suction portion located below the liquid surface of the sludge water, and a cylindrical flow path extending between the discharge portion and the liquid suction portion, The aeration system, wherein the solids concentration in the sludge water is 0.1 mass % or more and 20 mass % or less, based on the mass of the sludge water.

2. The aeration system according to claim 1 , wherein the liquid scattering member is disposed at an angle relative to an axis of the rotating shaft such that the liquid suction portion is located closer to the discharge portion than the liquid discharge portion.

3. The aeration system according to claim 1 , wherein the sprinkling member has a cylindrical shape and is curved.

4. Angle θ between the direction in which the discharge portion is directed and the horizontal direction ２ With respect to the horizontal direction, −90°≦θ ２ 4. The device according to claim 3, wherein the angle is ≦20°.

5. The sprinkling device according to claim 1 , wherein a motor is connected to one end of the rotating shaft.

6. The aeration system of claim 1 , wherein the motor is connected to a lower end of the rotating shaft.

7. The aeration system of claim 1 , wherein the motor is connected to an upper end of the rotating shaft.

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