JPH0474502A - Precipitation tank for floating-type waste water treatment apparatus - Google Patents

Abstract

PURPOSE:To prevent the solid-liquid separating effect in a precipitation tank from lowering and easily install a highly functional waste water treatment apparatus in a floating structure by uniformly causing overflow in all the circumference of an overflowing gutter constantly even if a precipitation tank of the waste water treatment apparatus is tilted. CONSTITUTION:Overflowing water flows in an overflowing gutter 1 through overflowing holes 10 formed in its circumference and there are a float 2 on each upper side of the overflowing gutter 1 and a balance tank 3, in which overflowing water from the overflowing gutter 1 in the opposite flows, in the lower side and a pipeline through which the overflowing water is stored once in the balance tank 3 and discharged out of the precipitation tank and the floating-type overflowing gutter 1 having a structure like this is fixed in the upper side. Owing to the structure, even if the precipitation tank of a waste water treatment apparatus tilts, overflow occurs uniformly in the all circumference of the overfloawing gutter constantly and thus solid-liquid separation effect in the precipitation tank does not lower. As a result, a highly functional waste water treatment apparatus is installed easily in a floating structure.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to a settling tank of a sewage treatment system that is moored on the sea or a lake and is built into a floating structure that may be shaken by wind, rain, or waves. Related.

(Prior Art) Conventional sewage treatment equipment has been installed on land, so it was originally installed horizontally and there was no concept of it shaking. Therefore, in order to increase the solid-liquid separation effect in the sedimentation tank and obtain a uniform overflow effect, the overflow weir was installed horizontally and fixed to the main body of the sedimentation tank.

(Problem to be Solved by the Invention) When a sewage treatment device having a horizontally fixed overflow weir is installed in a floating structure that is subject to shaking due to wind, rain, and waves, if the floating structure tilts, As a result, the sedimentation tank of the sewage treatment equipment also tilts, and the overflow in the sedimentation tank occurs only from a part of the overflow weir.As a result, the balance between the flow rate of water and the sedimentation rate of solids is disrupted, and the solid-liquid separation effect is impaired. decreases significantly. For this reason, it was not possible to mount a high-performance sewage treatment system on a moored floating structure, and the sewage had to be transported to a sewage treatment system on land.

(Means for Solving the Problems) In order to solve the above problems, the present invention floats the overflow in a sedimentation tank, provides an overflow hole in the side of the overflow gutter instead of an overflow weir, and The structure is such that the overflow hole is slightly submerged in the water and floats in balance. Due to this structure, even if the sedimentation tank of the sewage treatment equipment is tilted, overflow always occurs uniformly from the entire circumference of the overflow gutter, so the solid-liquid separation effect in the sedimentation tank does not deteriorate.

(Example) A cross-sectional view of a settling tank for a floating sewage treatment apparatus of the present invention is shown in FIG.

(b) The overflow gutter (1) in the settling tank is slightly submerged in the water through the overflow hole (10) due to the balance between the buoyancy of the float (2) and the weight of the water stored in the balance tank (3). It has a structure that balances and floats depending on the state. (Hereinafter, this overflow gutter (1), float (2), and balance tank (3) are collectively referred to as the 11!! i-flow floating object.) The overflow floating object has a sliding plate (9) around it. shall be provided at a certain distance from the inner wall of the settling tank.

(b) Water that has overflowed into the overflow gutter (1) through the overflow hole (10) passes from the overflow gutter advection port (11) through the overflow gutter advection pipe (5) and flows to the opposite side of the seam. Each balance tank (3
). The water flowing into the balance tank (3) is discharged from the balance tank advection port (12) to the outside of the settling tank through the settling tank advection pipe 6). An air vent pipe is provided in the balance tank (3) to facilitate the flow of overflow water. As shown in the detailed sectional view of the balance tank in Figure 3, by mounting the balance tank advection port (12) above the bottom of the balance tank (3), overflow water can be pumped into the balance tank (3). A certain amount of water shall be stored, and the weight shall be balanced between the front, rear, left and right sides of the overflow floating object.

(c) The float (2) at the top of the overflowing floating object should have as large a volume as possible above the water surface so that the overflowing floating object can quickly recover from shaking or tilting.

(d) Overflow floating objects usually float in the water, so when the water flowing into the settling tank stops and the water level in the settling tank falls, the overflow floating objects also drop with the water level. A lower stopper (7) of the overflow floating object is provided to ensure a minimum volume for solid separation in the sedimentation tank.

(n) When the overflow floating object falls to the lower stopper (7) and the overflow stops, the advection from the balance tank advection port (12) in the balance tank (3) also stops, and the overflow floating object C
Although it is fixed on the lower stopper for a while, it continues to be inserted into the small hole (13) provided at the bottom of the balance tank advection port (12).
), the water stored in the balance tank (3) gradually flows out, and as the buoyancy of the float (2) becomes greater than the weight of the water stored in the balance tank (3), the overflow floating object rises a little. The structure is such that the lower stopper (7) prevents overflow floating objects from being fixed for a long time.

(f) When the flow into the sedimentation tank resumes and the water level rises, the overflow floating objects will rise with the water level, but at this time overflow has not yet occurred. Therefore, in order to restart the overflow from the spear overflow hole (10) by slightly submerging the overflow 29 object in the water, an upper stopper 1 (8) is provided at the upper part of the settling tank.

(g) By floating the overflow floating object in a stable state on the water surface as described above, it is always distributed evenly from the entire circumference of the overflow gutter (1) without being affected by the shaking or tilting of the sedimentation tank. Can be overflowed.

In this example, both the sedimentation tank and the overflow floating object are square, but the same shape (i) may be any polygon.Also, by providing an appropriate control water plate in the sedimentation tank, the internal structure of the sedimentation tank against agitation can be reduced. It is more effective in preventing a decrease in solid-liquid separation.

(Function) The overflow floating object performs the following operations in response to fluctuations in the water flowing into the settling tank.

(a) When the overflow floating objects are floating in the water in the settling tank without overflowing, water is not yet stored in the balance tank (3).

(b) When water begins to flow into the sedimentation tank through the sedimentation tank inflow pipe (4), the water level in the sedimentation tank rises, and the overflow floating objects floating on the water surface also rise accordingly.

(J)) When the water level rises further and the overflowing floating object hits the upper stopper (8), the overflowing floating object hits the upper stopper (8).
), only the water level rises and the overflow gutter (
Overflow starts from part or all of the overflow hole (10) in step 1). Overflow water is stored in the balance tank (3) on the opposite side of the overflowing side.
).

(d) The balance tank advection port (12) in the balance tank (3) is set higher than the bottom of the balance tank (3), and the small hole (13) below the balance tank advection port (12) is small. When the flow rate of overflow water flowing into the balance tank (3) is larger than the flow rate discharged from the small hole (13), the overflow water is stored up to the height of the balance tank advection port (12), and the overflow water is stored up to the height of the balance tank advection port (12). ) overflows and is discharged outside the settling tank.

As a result, the water stored in the balance tank (3) becomes a haranthwaite.

(n) Before the overflow begins, the left and right weight balance of the overflow floating object is disrupted, and the overflow begins at some overflow holes (10
), the overflow water is transferred to the balance tank on the opposite side (
3), the weight balance is immediately reversed and overflow occurs from the side opposite to the side where overflow first started. In this way, the opposing sides maintain balance as the water overflows, and the overflow water is stored in the balance tank (3).

(v) When water is stored in the balance tank (3), the weight of the overflow floating object increases, and it is balanced at a position where all overflow holes (10) are evenly submerged slightly into the water of the sedimentation tank. It becomes a floating state.

(g) As a result, even if the structure tilts due to waves and the sedimentation tank of the sewage treatment equipment sways or tilts,
Overflow floating objects move in the same way as the water in the sedimentation tank, so the positional relationship between the overflow hole (10) and the water surface is uniform over the entire circumference of the overflow gutter (1), so stable overflow can be achieved. Flow performance can be obtained.

In addition, the amount of water flowing into the sedimentation tank is constant in the case of a blockage;
Since the total area of the overflow hole (10) has a size commensurate with the maximum amount of water flowing into the settling tank, the water level in the settling tank is usually constant.

(h) Even if the inflow of water into the sedimentation tank stops, overflow will continue, so the water level in the sedimentation tank will gradually drop.

As the water level in the sedimentation tank decreases, the overflow floating object lowers and hits the lower stopper (7), at which point the overflow stops.

When the overflow stops, the overflow water stops flowing into the balance tank (3), and the overflow drainage from the balance tank advection port (12) also stops, but the balance tank advection port (
12) As water continues to drain from the small hole (13) at the bottom, the water stored in the balance tank gradually decreases, and as a result, the buoyancy of the float (2) becomes greater than the weight of the overflowing floating object. , the overflowing floating object will float up a little. This floating prevents the overflow floating object from being fixed on the lower stopper (7) for a long time.

From this state, the state returns to (a) and the overflow floating object is constantly floating on the water surface.

(Effects of the Invention) According to the present invention, it is possible to easily install a high-performance sewage treatment device on a floating structure that is moored on the sea or on a lake and may be shaken by wind, rain, or waves. It is now possible to install a sewage treatment device on the main body of a floating structure such as a passenger ship or marine leisure facility, and at the same time, if the main body has already been completed and cannot be modified, a separate floating sewage treatment device can be moored around the main body. It also becomes possible to transport and treat wastewater from the main body. Furthermore, if there is not enough area to install a sewage treatment device on the coast due to the coast approaching a mountain in waterfront planning, etc., it is possible to install a floating sewage treatment device on the sea. Development is also possible on the coast of the land.

In this way, the installation of floating sewage treatment equipment using the present invention will enable new development on coasts and lakeshores across the country, which currently cannot be developed because there is not enough land space to install sewage treatment equipment. At the same time, it will also help conserve the environment of seawater and lake water in areas like this, where sewage has traditionally tended to flow away.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of an embodiment of the sedimentation tank for a floating sewage treatment device of the present invention, Fig. 2 is a plan view taken from A-A' in Fig. 1, and Fig. 3 is a detail of the balance tank. A cross-sectional view is shown. The meanings of the important symbols in the diagram are as follows: 1, overflow 41! 2. Float 3, balance tongue 4. Sedimentation tank inflow pipe 5, overflow gutter advection pipe 6
．． Sedimentation tank advection pipe 7, lower stopper 8. Upper stopper 9, sliding plate 10. Overflow hole ++, overflow gutter advection opening 12. Balance tank advection port 1
3° small holes 14a, 14b. flexible full pose

Claims (1)

[Claims] (1) Overflow water flows in from the overflow hole provided around the overflow gutter, and each side of the overflow gutter has a float at the top, and the overflow water from the overflow gutter on the opposite side flows into the lower part. A sedimentation tank for a floating sewage treatment device, which has a balance tank and incorporates a floating overflow gutter in the upper part, which is a piping for overflow water to be temporarily stored in the balance tank and then discharged outside the sedimentation tank.