JPH0329480B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is used to remove red tide and blue-green algae that occur in closed water areas such as lakes, dams, and inner bays, and to purify water areas where eutrophication is progressing. This relates to a purification device for closed water areas used for water purification.

[Conventional technology]

The surface layer of closed water bodies is exposed to sunlight and is prone to algae and plankton, which causes red tide and blue-green algae. However, by guiding this algae and plankton to the bottom of the water, where sunlight does not reach, this can be prevented. has been known for a long time.

In addition, it is known that phosphorus, which is the source of eutrophication, can prevent eutrophication without leaching into the water if oxygen is abundant. This is a method that provides sufficient oxygen to the deep layers of the water to prevent the elution of phosphorus.

Therefore, as a device for carrying out this deep aeration method, as shown in the cross-sectional view of FIG. downcomer pipe 4,
JP-A-61-54287 discloses an invention relating to a purifying device for a closed water body having a pump 2 for pumping up surface water into a water storage tank 1 and a pumping device such as a suction pipe 3.

This device pumps and stores oxygen-containing water on the surface of the water surface W in a water storage tank 1, and uses the difference in water level between the water storage tank 1 and the water surface W to cause water convection to flow into the deep layer of the water bottom B. The extended downcomer pipe 4 sends surface water to the deep layer.

However, since the above-mentioned device does not pump surface water into the deep layer, there is a problem in that it cannot be expected to be effective in actively removing red tide or blue-green algae when they occur.

[Purpose of the invention]

The present invention was made in order to solve the above-mentioned conventional problems, and provides a purification device that can actively carry out deep aeration of a closed water area and forcibly remove red tide and blue-green algae that occur. It is intended to.

[Summary of the Invention] To achieve the above object, the closed water purification device of the present invention includes a suction tank whose upper end is set slightly lower than the water surface so as to introduce surface water to a float floating on the water surface. A vertical drainage system in which a top plate is placed at or slightly below the water level in the suction tank, and the surface water in the suction tank is discharged in two horizontal directions near the bottom of the water via a submersible pump installed at an appropriate depth. It is constructed by providing a drainage pipe consisting of a pipe and a horizontal drainage pipe communicating with it, and the surface water introduced into the suction tank is transferred via a submersible pump from the horizontal drainage pipe to the deep layer of the water bottom in two horizontal directions without disturbing the water bottom. discharge to,
It provides sufficient oxygen to the deep layer for deep aeration.

In addition, discharging the surface water in the above-mentioned suction tank in two horizontal directions near the bottom of the water via a filter medium and a submersible pump has the function of collecting floating debris to remove relatively large algae and debris from the surface water. This is a desirable configuration.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a closed water purification device in Embodiment 1 of the present invention, and FIG. 2 is a line AA in FIG. 1.
FIG.

First, as shown in the figure, this purification device
A float 11 floating on the ground, a pedestal 12 connecting each float 11, a storage battery 13 installed on the pedestal 12, and a suction tank 1 installed between each float 11.
4. A top plate 19 placed above the suction tank 14, a submersible pump 15 installed at the bottom of the suction tank 14,
A discharge pipe consisting of a vertical discharge pipe 16 connected to the discharge side of the submersible pump 15 and a horizontal discharge pipe 17 located near the water bottom B connected thereto, and two propulsion units installed at the ends of the float 11. It is composed of a container 18.

Next, this submersible pump 15 sucks the surface water introduced into the suction tank 14 using the power supplied from the storage battery 13; For example, the water level is set to be about 10 cm lower than the water surface W.

Then, the submersible pump 15 is installed at a position several tens of centimeters below the water surface W so that only surface water is discharged to the deep layer near the bottom where the horizontal drain pipe 17 is located, and furthermore, the submersible pump 15 does not suck air. The top plate 19 is placed above the suction port of the submersible pump 15 at the same level as the water surface W or slightly below so that only water is sucked in.

Here, the suctioned surface water is discharged laterally in the deep layer near the water bottom without disturbing the water bottom B from a discharge pipe consisting of a vertical discharge pipe 16 and a horizontal discharge pipe 17.

In this case, the surface water is preferably discharged in two horizontal directions as in Example 1. When the surface water is discharged horizontally and radially, the surface water discharged to the deep layer immediately rises above the water surface W. Therefore, experimental results have confirmed that this is undesirable.

In addition, as in this embodiment 1, the two propulsors 18 attached to the ends of the float 11 are connected to the storage battery 1.
It is possible to purify a wide range of closed water areas by moving it through closed water areas where red tide and blue-green algae have occurred by driving it by remote control using the power of No. 3.

Next, FIG. 3 is a side view showing a partial cross section of a purification device in Embodiment 2 of the present invention, and FIG. 4 is a plan view of FIG. 3, which has almost the same configuration and function as Embodiment 1. However, in this second embodiment, a circular suction tank 14 is attached to the lower part of the circular float 11, and before the surface water introduced from the upper end of the outer circumference of the suction tank 14 is sucked into the submersible pump 15, It is designed to flow through a filter medium 20 such as granules, and as a result, relatively large algae in the surface water can trap and collect garbage with this filter medium 20, so this device also has a floating garbage collection function. You can hold it.

〔Effect of the invention〕

According to the device of the present invention, only surface water containing air on the surface of a closed water body can be actively sent to the deep layer near the bottom of the water without disturbing the bottom, and phosphorus present on the bottom of the water can be absorbed into the water. This has the effect of preventing eutrophication by preventing leaching into water.

It also has the effect of removing red tide and blue-green algae because it can forcefully guide the red tide and blue-green algae that occur to deeper layers where sunlight cannot reach.

Furthermore, if the purification device of the present invention is made movable,
It also has the advantage of being able to purify a wide range of closed bodies of water.

On the other hand, if the surface water in the suction tank is discharged near the bottom of the water via a submersible pump through an appropriate filter medium in the device of the present invention, this device can also have the function of collecting floating debris.

Furthermore, since the top plate is placed at or slightly below the water level in the suction tank, the submersible pump can effectively suck in only water without suctioning air, and can effectively send only surface water to the vicinity of the bottom of the water. In addition, since the surface water can be discharged in two horizontal directions through the discharge pipe near the bottom of the water, it also has the effect that the surface water discharged into the deep layer does not immediately rise toward the water surface.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a purification device in Embodiment 1 of the present invention, Fig. 2 is a plan view showing a partial cross section in the A-B direction of Fig. FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a sectional view of a conventional purification device using the deep aeration method. 11...Float, 14...Suction tank, 15...
Submersible pump, 16... Vertical discharge pipe, 17... Horizontal discharge pipe, 20... Filter medium, B... Water bottom, W... Water surface.

Claims (1)

[Claims] 1. A suction tank for introducing surface water is attached to a float floating on the water surface, a top plate is arranged at or slightly below the water surface in the suction tank, and the surface water in the suction tank is pumped by a submersible pump. A purification device for closed water bodies equipped with a discharge pipe that discharges water in two horizontal directions near the bottom of the water. 2. The closed water purification device according to claim 1, wherein the surface water in the suction tank is discharged in two horizontal directions near the bottom of the water via a submersible pump via a filter medium.