JPH0249527A - Aeration apparatus - Google Patents

Abstract

PURPOSE:To effectively remove inhibiting components such as CO2 and carbonate in water to be treated by blasting air through an aeration port into the water in a water-feeding channel and discharging the deaerated water through a filter material layer from a waste water channel. CONSTITUTION:Water to be treated is introduced into a water-feeding channel 3 through a water-feeding line 5 and air is blasted through an aeration port 10 of an aeration tube 6 into the water to increase the dissolved oxygen content. CO2, carbonate, etc., are separated from the water in a space 2 and discharged from the system through a deaeration line 9. The deaerated water is passed through a filter material layer 8 and discharged from the deaeration system 1 through a waste water channel 4.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an aeration device, and more specifically, when seafood is transported in a live state or stored for a long period of time, the live fish itself contained in water is It relates to an aeration device used to remove obstacles such as CO2, carbonate, air bubbles, etc. that are excreted from the air.

BACKGROUND OF THE INVENTION Recently, as methods for preserving seafood, methods of preserving seafood in a live state for a long time with a high survival rate, as well as methods of transporting seafood while still alive, have been attracting attention.

The reason for this is that seafood can be preserved in a live state, and when it is in a live state, the color and flavor of the seafood are fully utilized, increasing its commercial value.

As a conventional method for preserving seafood in a live fish state for a long time with a high survival rate, there is, for example, Japanese Patent Publication No. 5430959.

This involves housing live fish in a container at a high density, adjusting the temperature of the stored water to the optimal temperature range in which live fish and shellfish can survive, and adjusting the concentration of ammonia nitrogen compounds, water-soluble organic matter, and carbonate radicals in the stored water. This method uses a removal device to remove the raw fish, and prevents the oxygen concentration from exceeding a certain range, and also prevents the oxygen concentration from falling below a certain value. According to this method, it can be stored for about 10 days, depending on the type of live fish. It is possible.

However, when applying this to transportation, the conditions are much stricter than in the case of preservation, and the equipment itself is loaded onto a transport vehicle, making it almost impossible to replenish water. If water is not regenerated sufficiently, such as by removing obstacles, live fish may die or become fatigued, making it impossible to transport live fish for long periods with a high survival rate.

In this conventional example, the water in the container is drawn out from the bottom and led to a water adjustment tank, where air is blown in to remove carbonate radicals and ammonia and organic matter are removed using respective removal devices. The water is returned to the container and used for circulation, but with this method, simply blowing air into the water in the water adjustment tank is insufficient to remove CO2, even if the amount of dissolved oxygen is sufficient. , which impairs the breathing of fish and increases the mortality rate. In addition, the coexistence of air bubbles causes excessive stress on fish, leading to a high rate of exhaustion.

Furthermore, as shown in Japanese Patent Application Laid-Open No. 58-67135, there is a method in which a water jet ejector is used for aeration and treated water is circulated into a container from an adjustment tank that adjusts aeration and cooling. Although it has the advantage of increasing the amount of oxygen supplied, it cannot be said that the removal of CO2, carbonate radicals, air bubbles, etc. is sufficient.

As explained above, conventional aeration devices used for wastewater treatment of water discharged from live fish containers have been proposed to merely supply oxygen-containing gas such as air to the water in the containers.

For this reason, no apparatus has been proposed that is suitable for long-term and high-density transportation as an aeration apparatus for treated water when transporting live fish.

Problems to be Solved by the Invention The purpose of the present invention is to solve the above-mentioned drawbacks, and specifically, to efficiently remove obstacles such as CO2, carbon dioxide, air bubbles, etc. contained in the waste water in the container, and An object of the present invention is to provide an aeration device that can suppress loss of stored water.

Means for Solving the Problems and Their Effects Namely, the present invention provides an aeration device that aerates impurities such as CO2 and air bubbles contained in wastewater and releases the aeration gas from the upper part. In the lower part of this space, there is a water supply passage provided with an opening opening into the space on one side and an air supply port for supplying air on the other side, and a filter material (■) is placed around this water supply passage in the space. It is characterized in that it has a drainage passage provided so as to be in contact with the water supply passage, and that the filter material (1) is provided at a position lower than the opening of the water supply passage.

Hereinafter, the configuration and operation of the means of the present invention will be explained with reference to the drawings.

In addition, FIG. 1 is a sectional view showing one embodiment of the aeration device according to the present invention, FIG. 2 is a longitudinal sectional view showing another embodiment, and FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG.

1 is an aeration device, 2 is a space, 3 is a water supply passage, 4 is a drainage passage, 5 is a water supply pipe, 6 is an air supply pipe, 7 is an opening, 8
9 indicates a gap between the filter media, 9 indicates a bubble vent pipe, and 10 indicates an air supply port.

First, the aeration device designated by reference numeral 1 in FIG. 1 consists of a cylindrical □ having a bubble removal tube 9 at the top. This cylindrical aeration device has a space 2 in the upper part, an opening 7 opening into the space 2 on one side and an air supply port 10 supplied from the air supply pipe 6 on the other side in the lower part of this space 2. It consists of a water supply passage 3 provided with a water supply passage 3, and a drainage passage 4 surrounding this water supply passage 3.

Further, the drainage passage 4 is provided with a filter material 8 at the upper part thereof at a position lower than the position of the opening 7 of the water supply passage 3.

Next, the operation of this aeration device will be explained using as an example the water to be treated containing obstacles such as CO2 bubbles discharged from an aquarium for transporting live fish.

When this water to be treated is introduced into the water supply passage 3 from the water supply pipe 5, air is injected into the water to be treated in the water supply passage 3 through the air supply port 10 of the air supply pipe 6.

In this water supply passage 3, the water to be treated and air are mixed, the amount of dissolved oxygen increases, and the amount of CO2 contained in the water to be treated increases.
Obstacles such as carbonic acid roots and air bubbles are aerated with air and CO2,
Carbonate radicals, air bubbles, etc. are separated from water in the space 2 and are discharged from the bubble removal pipe 9 to the outside of the system.

On the other hand, the deaerated and defoamed water passes through the filter material layer 8 to the drainage passage 4.
is discharged from the aeration system 1.

The filter material li8 is a foamed, porous synthetic resin particle that floats in water, and as described above, it is provided at a slightly lower height than the position of the opening 7 of the water supply passage 3. is preferred. The reason why the filter material layer 8 is provided like the mouth is that when the fine air bubbles contained in the aerated, deaerated, defoamed water pass through the filter material layer, they are captured on the surface of the porous resin particles, and these resin particles Due to the floating rotational motion of
It is discharged. Further, the reason why the filter material layer 8 is provided at a position slightly lower than the opening 7 is that the water to be treated rising from the water supply passage 3 is in a pressurized state, and the filter layer 8 is located at a position lower than the opening 1 in the space 2. This is because the pressure decreases, making it easier to separate the bubbles.

Next, other embodiments will be described.

The aeration apparatus shown in FIGS. 2 and 3 is a rectangular parallelepiped type, and is an example in which four water supply passages 3 are provided. This action is similar to that described in the previous embodiment, but will be further explained as follows.

As shown in FIG. 2, water to be treated is supplied from the lower portions of the four water supply passages 3, and air is further supplied to the water to be treated from the supply port 10 of the air supply pipe 6 provided at the lower part of the water supply passages 3. When injected, the waste water and air are mixed and aerated in the water supply passage 3, and CO2, air bubbles, etc. and water are separated in the space 2 and discharged from the bubble removal tube 9 to the outside of the yarn.

On the other hand, even if some air bubbles remain in the aerated water discharged from the opening 7 of the water supply passage 3, when it is introduced into the filter material @8 and comes into contact with the filter material, it easily becomes water. The water is separated, mixed with GO□, air bubbles, etc., and discharged from the bubble removal pipe 9, and the aerated water is discharged to the outside of the aeration device 1 through the drainage passage 4.

Although cylindrical and rectangular parallelepiped aeration devices have been given as examples of the aeration device, the present invention is not limited to any shape, number of water supply passages, etc. as long as the aeration device has the above configuration. Further, if the opening of the aeration device is provided at a position 30ffl111 or more lower than the water level in the live fish container, the introduction of the water to be treated becomes easy due to the principle of air lift, and power etc. are not required, making it suitable for transportation.

Example Water from an aquarium containing 2 tons of water and 300 kg of live fish was continuously discharged, and an aeration test was conducted using the aeration device shown in Figure 1 to remove CO2 contained in the discharge at a rate of 36 g/hour. .

In addition, the opening 7 of the aeration device 1 is positioned 30 mm lower than the water level in the aquarium, and the water in the aeration device is introduced into the aeration device according to the near-lift principle, and air is blown into this water by a near blower. When the water was injected and aerated at a rate of 180001/hour, the water discharged from the drainage passage 4 was p
At H7.5 or higher, no bubbles were visually observed.

<Effects of the Invention> As explained above, the present invention provides an aeration device that aerates impurities such as CO2 and air bubbles contained in wastewater and releases the aeration gas from the top, which includes a space in the top of the aeration device; At the bottom of this space, there is a water supply passage provided with an opening opening into the space on one side and an air supply port for supplying air on the other side, and a filtration material layer is placed around the water supply passage in contact with the space. It is characterized in that it has a drainage passage provided in such a manner, and that the filtering material layer is provided at a position lower than the opening of the water supply passage.

The aeration device of the present invention can efficiently aerate impurities such as CO2 and air bubbles excreted from live fish in a tank containing live fish, and its shape is compact, so it can be loaded onto a transport vehicle etc. It is suitable for transporting live fish over long periods of time and at high density.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the aeration device according to the present invention, Fig. 2 is a longitudinal sectional view showing another embodiment, and Fig. 3 is a sectional view taken along the line A-A in Fig. 2. be.

Claims (1)

[Claims] 1) An aeration device that aerates impurities such as CO_2 and air bubbles contained in wastewater and releases the aeration gas from the upper part, which includes a space at the top of the aeration device and a lower part of this space. has a water supply passage provided with an opening opening into the space on one side and an air supply port for supplying air on the other side, and a drainage provided with a layer of filter material around the water supply passage so as to be in contact with the space. An aeration device comprising a passageway. 2) The aeration device according to claim 1, wherein the filtering material layer is provided at a position lower than the opening of the water supply passage.