JPH07717A - Precipitator for floating type sewage treating device - Google Patents

Abstract

PURPOSE:To always and uniformly make water overflow the whole circumference of a precipitator by floating the overflow trough in the upper part of the precipitator by a float and providing overflow holes in the circumference of the overflow trough. CONSTITUTION:An overflow trough 1 is balanced and floats with its overflow holes 10 a little immersed in water under balance between the buoyancy and the weight of the overflow trough 1 and a float 2 when the inflow quantity of water from an inflow pipe 4 to a precipitator is maximum. The height from the overflow holes 10 and the surface of the water is adjusted by vertically moving the float 2 with a float height adjusting screw 8. The overflow floating body is provided with a sliding plate 9 on the periphery and a fixed gap is left between the plate and the inner wall of the precipitator. Water passing through the overflow holes 10 and overflowing into the overflow trough 1 is discharged from an overflow trough transfer pipe 5 to outside the precipitator through a precipitator discharge pipe 6 connected to the overflow trough transfer pipe 5 by a flexible hose 12. Besides, the overflow floating body is hung from the top of the precipitator by a lifting lug 7 so that it may be not lowered below a fixed level to secure the minimum volume for solid-liquid separation in the precipitator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a settling tank of a sewage treatment apparatus which is moored on the sea or on a lake and is incorporated in a floating structure which may be shaken by rain wind or waves.

[0002]

2. Description of the Related Art A conventional sewage treatment apparatus has been installed on land, so that it was originally installed horizontally and there was no concept of shaking. Therefore, in order to enhance the solid-liquid separation effect in the settling tank and to obtain an even overflow effect, the overflow trough was installed horizontally and fixed to the main body of the settling tank.

[0003]

When a sewage treatment apparatus having a horizontally fixed overflow gutter is incorporated in a floating structure which is shaken by wind and rain or waves, when the floating structure tilts, Along with that, the settling tank of the sewage treatment device also tilted,
Overflow in the settling tank occurs only in a part of the overflow gutter, and as a result, the balance between the flow velocity of water and the sedimentation velocity of solids is disturbed and the solid-liquid separation effect is greatly reduced. Therefore, the moored floating structure could not be equipped with a high-performance sewage treatment device, and the sewage had to be transferred to a land-based sewage treatment device.

[0004]

In order to solve the above problems, the present invention floats an overflow gutter in a settling tank, and instead of the overflow gutter, an overflow hole is provided on the side surface of the overflow gutter. The structure is such that the flow hole is balanced and floats when it is slightly submerged in the water. Due to this structure, even if the settling tank of the wastewater treatment device is tilted, the overflow gutter is floating, so overflow always occurs uniformly from the entire circumference of the overflow gutter, and the solid-liquid separation effect in the settling tank does not deteriorate. Absent.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a sectional view of a settling tank for a floating type sewage treatment apparatus.

In the overflow gutter 1 in the settling tank, when the amount of inflow to the settling tank is the maximum, the overflow hole 10 is slightly submerged in the water in the balance of the buoyancy and weight of the overflow gutter 1 and the float 2. The structure is such that it floats in balance with each other. The height of the overflow hole 10 and the water surface is adjusted by moving the float 2 up and down with the float height adjusting screw 8. (Hereinafter, the overflow gutter 1, the float 2 and the center well 3 are collectively referred to as an overflow floating body.)

A sliding plate 9 is provided around the overflow floating body so as to be spaced a fixed distance from the inner wall of the settling tank.

The water overflowed into the overflow gutter 1 through the overflow hole 10 is discharged from the overflow gutter advection pipe 5 to the outside of the precipitation tank through the precipitation tank discharge pipe 6. A flexible hose 12 is connected in the middle of the settling tank discharge pipe 6 so that the overflow floating body can be easily interlocked with the water surface.

The float 2 above the overflow floating body has a volume on the water surface that is as large as possible, so that the overflow floating body can be quickly restored from shaking and inclination.

Since an overflow floating body is usually floating in water,
When the water flowing into the settling tank is stopped and the water level in the settling tank drops,
Since the overflow floating body also goes down to the water level, in order to prevent this, the overflow floating body is hung from the top of the settling tank with a suspending device 7 so that the overflow floating body does not drop below a certain level. Ensure a minimum volume for solid-liquid separation of.

As described above, by floating the overflow floating body in a stable state on the water surface, the overflow gutter 1 is always made to flow evenly over the entire circumference of the overflow trough 1 without being affected by the shaking and inclination of the settling tank. You can

In this embodiment, both the settling tank and the overflow floating body are square, but they may be circular or polygonal.

Further, by providing an appropriate water control plate in the settling tank, it is more effective to prevent the solid-liquid separation in the settling tank from being lowered due to shaking.

[0014]

[Function] The overflow floating body operates as follows in response to the fluctuation of the water flowing into the settling tank. The overflow floating body is a weight balance that floats freely on the water surface of the settling tank when the amount of inflow into the settling tank is maximum, and the inflow rate and the overflow rate at this time are adjusted to be equal. In this state, the positional relationship of the height between the overflow hole 10 and the water level in the settling tank is constant, and the overflow rate is constant regardless of the increase / decrease in the inflow rate. If the amount of overflow is constant, the amount of discharge in the settling tank is also constant, and if the inflow is reduced as a result, the water level in the settling tank will drop. As the water level in the settling tank lowers, so does the position of the floating overflow. However, since the overflow floating body is suspended from the top of the settling tank by the suspenders 7, it does not fall below the length of the suspenders.
The water level in the settling tank is slightly lowered at the height relative to the overflow hole 10, and the overflow rate decreases. In this way, hanging device 7
With a slight weight of the overflow floating body, the inflow amount and the overflow amount (discharge amount) of the settling tank become equal.

When the flow into the settling tank is stopped, the water level in the settling tank gradually decreases to the lower end of the overflow hole 10, but the overflow also stops at that point, so the water level does not drop any further.

At this time, a part of the weight of the floating structure is the lifting device 7.
Although most of the weight is supported by the buoyancy of the float 2, and the hanger 7 is attached to the top of the settling tank at a single point, the floating structure is kept in the settling tank. It works in conjunction with the water surface.

In this way, even if the amount of inflow into the settling tank changes, the floating structure is always linked to the inclination of the water surface. As a result, even if the floating structure tilts due to waves and the settling tank of the sewage treatment device shakes or tilts accordingly, the overflow floating body moves in the same way as the water in the settling tank, and therefore the overflow hole 10 and the water surface. Since the positional relationship with is uniform over the entire circumference of the overflow gutter 1,
Stable overflow performance is obtained.

[0018]

According to the present invention, moored at sea or lake,
Since it is possible to easily install a high-performance sewage treatment device on a floating structure that may be shaken by wind and rain or waves, it is possible to install a sewage treatment device on the main body of a floating structure such as a moored passenger ship or marine leisure facility. At the same time as installation is possible, if the main body is already completed and cannot be modified, a floating body type waste water treatment device can be moored around the main body and waste water can be transferred from the main body for treatment.

Furthermore, in the water front plan, etc., even if the coast is approaching the mountain and the area for installing the sewage treatment device cannot be provided on the shore, a floating type sewage treatment device is installed on the sea. By installing, it becomes possible to develop even on the coast of a small land.

As described above, the installation of the floating body type sewage treatment apparatus adopting the present invention is newly performed on the coast and lake shores of the whole country where the development is not possible because there is not enough area to install the sewage treatment apparatus on land at present. At the same time, it will be useful for environmental conservation of seawater and lake water in such areas where there was a tendency to discharge wastewater.

[Brief description of drawings]

FIG. 1 is a side sectional view of an example of a settling tank for a floating body type waste water treatment device.

FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG.

[Explanation of symbols]

 1 Overflow gutter 2 Float 3 Center well 4 Precipitation tank inflow pipe 5 Overflow gutter transfer pipe 6 Precipitation tank discharge pipe 7 Lifting device 8 Float height adjusting screw 9 Sliding plate 10 Overflow hole 11 Flexible ho -House 12 Flexible hoses

Claims (1)

[Claims] 1. A settling tank for a floating-type wastewater treatment device, wherein the overflow gutter is floated above the settling tank by a float, and an overflow hole is provided around the overflow gutter.