Wind-resistant sedimentation tank

Abstract

To provide a settling basin with an anti-wind capability, which is immune to wind effects.SOLUTION: Provided is a settling basin with an anti-wind capability. The water surface section in the settling basin is divided with floats extending 5-50 cm above the water surface. Each of these divided areas has a surface area of 1-20 m2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a sedimentation basin used for treating sewage, industrial water, manufacturing water, and industrial wastewater. More specifically, it relates to a sedimentation basin equipped with a wind-resistant function.

Background Art

[0002] Conventionally, with the development of industries, sedimentation basins are required to perform water treatment, and a large number of sedimentation basins have been installed in various places. However, conventional sedimentation basins are easily affected by temperature and wind, and in particular, the influence of wind has had an adverse effect on the treatment capacity. Among them, the sedimentation basins installed in coastal areas were particularly affected. That is, land has a small specific heat and is easy to warm up and cool down, while the ocean has a large specific heat and is difficult to warm up and cool down. Due to this phenomenon, wind blows from the sea to the land during the day and from the land to the sea at night. Therefore, especially the sedimentation basins installed in coastal areas were affected by these winds and the intended purpose was not achieved.

[0003] Originally, wind is constantly flowing, and its wind direction and wind speed are also changing. And the turbulence of wind is considered as irregular flows of strong and weak, various and miscellaneous vortices. That is, it does not flow constantly, but constantly speeds up and slows down, and also flows while fluctuating vertically and horizontally. Wind has elements of wind direction and wind speed, and three-dimensionally has a movement with three directions: horizontal longitudinal (progress direction), horizontal transverse (perpendicular to the progress direction), and vertical (up and down direction). And wind has the characteristic that its cycle is short and the wind speed changes frequently during a very short period of fine fluctuations.

[0004] As described above, especially in coastal areas, it often blows from the sea to the land from around 9 to 11 o'clock, about 3 to 4 hours after sunrise, until around 21 o'clock, and often blows from the land to the sea from around 19 to 23 o'clock, 1 to 2 hours after sunset, until after sunrise.

[0005] Consequently, the sedimentation tanks in coastal areas do not always flow uniformly. As mentioned above, they are affected by wind throughout the day, resulting in wind-driven currents and uneven flow within the sedimentation tanks. This reduces the water treatment area, and also leads to the outflow of turbidity due to carryover and deterioration of treated water quality due to temperature convection. Furthermore, operational management was extremely difficult.

[0006] As a way to solve these problems, for example, a sedimentation tank with a ceiling that covers the sedimentation tank has been proposed (Patent Document 1). Also, a sedimentation separation device with a water surface protection material installed at the water intake has been proposed (Patent Document 2). [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2013-146685 [Patent Document 2] Japanese Patent Publication No. 2019-122918 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] Conventional sedimentation areas suffer from various problems due to the effects of wind, as these issues are not quantified in the design. Therefore, sedimentation ponds needed to regulate wind and water flow. This invention was completed as a result of various studies on how to solve problems such as the reduction of water treatment area (effective water treatment area) due to uneven flow in sedimentation tanks that are easily affected by wind, the prevention of turbidity runoff due to carryover, the reduction in treated water volume due to decreased sedimentation tank efficiency, the prevention of deterioration of treated water quality due to temperature convection, and difficulties in operation management. [Means for solving the problem]

[0009] In other words, the present invention divides the water surface area in a sedimentation tank by floating bodies that protrude 5 to 50 cm from the water surface, and the surface area within each divided section is 1 to 20 m². 2 This sedimentation tank is characterized by having wind-resistant properties. [Effects of the Invention]

[0010] Since the sedimentation tank of the present invention is not affected by wind, it does not cause uneven flow, allowing for effective use of the water treatment area. Furthermore, it prevents the outflow of turbidity due to carryover and prevents deterioration of treated water due to temperature convection, thus simplifying operation and management. [Brief explanation of the drawing]

[0011] [Figure 1] A plan view showing the floating structures connected in a triangular shape on the water surface. [Figure 2] A plan view showing the floating structures connected in a rectangular shape on the water surface. [Figure 3] A plan view showing the floating structures connected in a hexagonal shape on the water surface. [Figure 4] A plan view showing a circular sedimentation tank with floating bodies connected in a rectangular shape to the water surface. [Modes for carrying out the invention]

[0012] Examples of the form of the floating body F used in the present invention include a cylindrical body, a rectangular plate-shaped body, or a floating body in which a rectangular plate-shaped body is integrally attached to the upper part of a cylindrical body.

[0013] By connecting these floating bodies F, the water surface of the sedimentation tank can be divided into a triangular shape as shown in Figure 1, a rectangular shape as shown in Figure 2, or even a hexagonal shape as shown in Figure 3, thereby creating a large number of compartments. Furthermore, as shown in Figure 4, in a circular sedimentation tank, a trapezoidal rectangular section is provided for the water flow from the center of the sedimentation tank outwards. It is possible. In this case, the height of the part of the floating body that protrudes from the water surface must be between 5 and 50 cm. If it is less than 5 cm, the objective of the present invention will not be achieved, and if it is higher than 60 cm, it will become a wind-driven drift, and the floating body F will be damaged by wind pressure.

[0014] In addition to the protruding height of the floating body F, the surface area within a partitioned section needs to be 1 to 20 m 2 . If the surface area is less than 1 m 2 , the wind direction cannot be changed. On the other hand, if it is 20 m 2 or more, the wind cannot be dispersed.

[0015] The floating body F used in the present invention can be one provided with a hanging film at the lower part of each floating body, for example, a water flow inclined film such as "Patricia" (trade name of a product manufactured by Nippon Solid Co., Ltd.) can be used. Also, a hanging film row can be provided in an arbitrary shape at the lower part of the partitioned floating body F.

Explanation of Reference Signs

[0016] F ···· Floating body

Claims

【Request Item 1】 The water surface within the sedimentation tank is divided by floating bodies that protrude 5 to 50 cm from the water surface, and the surface area within each divided section is 1 to 20 m². ２ A sedimentation tank equipped with wind-resistant features.

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