JPH08132094A - Fine bubble discharger - Google Patents

Abstract

PURPOSE: To increase the discharge of a liq. contg. dissolved gas at the time of purifying the water in the closed waters, etc., to increase the content of fine bubbles in the discharge and to continuously discharge the fine bubbles. CONSTITUTION: A pressurized liq. contg. dissolved gas is supplied from one end of an inner cylinder 7, the other end is closed, and the cylinder is pierced with minute-inner-diameter injection holes 10. An outer cylinder 14 having a discharge port 16 and with which the liq. injected from the holes 10 is collided is provided outside the injection holes 10. The flow velocity of the liq. is suppressed by the injection from the holes 10 and the outer cylinder 14, the pressure is released at a breath, and many fine bubbles are discharged. When the original liq. is supplied to the device 1 through a pump, ejector and pressurized tank, the water is purified by the aeration, coagulated floc of fine bubbles and the adsorption and flotation of the suspended matter.

Description

Detailed Description of the Invention

[0001]

This invention relates to aeration in a closed water area such as a pond, a lake, a bay, or a sewage treatment plant,
The present invention relates to a device for discharging fine bubbles for use in water purification by flocculating flocs and adsorbing and floating suspended matter.

[0002]

2. Description of the Related Art Due to the delay in the construction of sewers, domestic wastewater flows into the closed water area through rivers or rivers as it is. Especially in the closed water area, the water area becomes eutrophication, and the deterioration of the water quality such as the multiplication of phytoplankton called blue-green algae, the change of fish species, the deterioration of the natural purification capacity, etc. is becoming popular.

Therefore, by directly aerating such a closed water area where the water quality is deteriorated, the ability of decomposing organic substances by air oxidation is improved to purify the water quality. Also in a wastewater treatment plant, in order to promote the activation of the sludge by sufficiently supplying the air (oxygen) necessary for the activated sludge in the wastewater, stirring the wastewater and the activated sludge, and uniformly suspending them. Is being aerated.

In both direct aeration and aeration to activated sludge, it is important to efficiently promote oxygen dissolution in water. For that purpose, it is necessary to make the contact area between water and air as large as possible. Therefore, the effect becomes larger as the size of the bubbles becomes smaller.

Further, as one of the methods for treating polluted water in a sewage treatment plant, a flocculant is added to the polluted water to form flocculated flocs, and fine flocculated air bubbles are adsorbed to the flocculated flocs so that the flocculated flocs can reach the water surface. There is a method to raise water and collect it to purify the water quality.

[0006] The method of utilizing the floc flocs may be carried out directly in a contaminated closed water area or in a case where polluted water is once pumped up and treated in a treatment plant and then the treated water is returned into the water area. Furthermore, industrial wastewater is treated at the treatment plant. In any case, the more uniform the bubbles and the smaller the particle size, the higher the adsorption rate and the quieter floating, and since bubbling does not occur in the upper layer, the adsorbed flocs and suspended matter can be recovered without being broken. .

By the way, aeration is necessary for water purification, but in the method in which a gas-dissolved liquid such as air is directly and continuously discharged from the tip of the drain hose, the tip is generally not squeezed. Although the discharge amount is large, the pressure is not released all at once and is gradually performed in the hose, so that the diameter of the bubble becomes large and the ratio of the minute bubble to the discharge amount is small.

On the other hand, when the tip portion is squeezed, if the squeezing method is halfway, the flow velocity at the time of discharge increases,
Since the pressure release after discharge is not performed at once, the diameter of the bubble becomes large, and the ratio of the fine bubble after discharge to the discharged amount becomes small. On the other hand, if the flow rate is extremely narrowed, the flow rate is suppressed and the ratio of the minute bubbles to the discharge amount increases, but the discharge amount decreases extremely.

In place of the method of directly discharging the gas solution from the tip of the drainage hose, a method of using a batch type discharge device using a pressure control valve is used, regardless of the diameter of the discharge hose. It makes up a large proportion of the total amount of emissions. However, since the discharge is performed intermittently, the total discharge amount is smaller than that in the method of discharging continuously, and the treatment efficiency is poor. Therefore, in order to secure the same amount of discharge as the continuous discharge method, it is necessary to increase the size of the device.

[0010]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to discharge a large amount of a gas-dissolved liquid, and to increase the ratio of the discharge amount of fine bubbles to a continuous discharge. .

[0011]

The feature of the fine bubble discharging apparatus of the present invention is that a pressurized gas dissolving liquid is supplied from one end and a fine inner diameter ejection hole group is provided in an inner cylinder closed at the other end. In addition, at least one of the supply side and the opposite side of the gas-dissolved liquid is opened outside the ejection hole group to form a discharge port, and the gas-dissolved liquid ejected from the ejection hole group collides with the outside. A cylinder is provided.

[0012]

1 and 2 show a micro-bubble discharging device 1 of the present invention. Reference numeral 2 is a connecting cylinder, and a discharge hose described later is provided at the rear end.
A hose connecting portion 3 for attaching and detaching the shoe 28 is provided, and a male screw 4 is provided at the tip portion. Reference numeral 5 is an outer cylinder connecting cylinder, and a male screw 6 is provided on the outer circumference.

Reference numeral 7 is an inner cylinder, and a female screw 8 provided at a rear end portion is screwed onto a male screw 4 of the connecting barrel 2 and attached to the connecting barrel 2. Reference numeral 9 is a lid, which is fixedly attached to the front end of the inner cylinder 7
Has blocked the tip.

Reference numeral 10 designates a large number of ejection holes penetrating the inner cylinder 7 at regular intervals and having a fine small diameter of 2 to 4 mm, and 3 mm in the embodiment. Female threads 11 are provided on the inner peripheral surface of these ejection holes 10 (see FIG. 2). Reference numeral 12 is a screw (or bolt) of a male screw member, which is an appropriately selected discharge hole 1
It is detachably screwed to the female screw 11 of 0 to close the ejection hole 10.

Reference numeral 13 denotes a plurality of reinforcing plates, which are discharge hoses.
It is fixed to the outer circumference of the connecting sleeve 2 and the inner circumference of the outer connecting sleeve 5.

Reference numeral 14 is an outer cylinder, and a female screw 15 is provided at the rear end portion. By screwing this female screw 15 onto the male screw 6 of the outer cylinder connecting cylinder 5, the outer cylinder 14 is connected to the outer cylinder. It is detachably attached to the cylinder 5 so that the ejection hole 10 can be opened and closed by screws 12 and the inner cylinder 7 can be maintained. The outer cylinder 14 encloses the inner cylinder 7 so that the front portion extends beyond the inner cylinder 7 and the front end portion is opened to form a discharge port 16.

Reference numeral 17 denotes a plurality of spacers, three spacers in the embodiment, the base portion of which is fixed to the front end portion of the inner cylinder 7 to partition the inner cylinder 7 and the outer cylinder 14.

Here, the outer diameter of the inner cylinder 7 is φ1, the inner diameter of the outer cylinder 14 is φ2, and the distance between the rear end of the outer cylinder connecting cylinder 5 and the rearmost ejection hole 10a of the inner cylinder 7 is L1. The distance between the ejection hole 10b at the tip and the tip of the outer cylinder 14 is L2. According to the experiment, φ
It is preferable that 2 ≦ 2φ1 and L2 ≧ φ2.

Further, since the rear end portion of the outer cylinder connecting cylinder 5 is opened and communicates with the outer cylinder 14 to form the second discharge port 16 ', for example, the second discharge port 16' is turned upward. If used, the gaseous solution can be drained from here. In this case, according to experiments, L1 ≧ φ2 is preferable.

FIG. 3 shows a purifying device for a closed water area (pond) using the fine bubble discharging device 1 of the present invention. 21 is a strainer installed in water, 22 is a suction hose, and P is a pump connected to the suction hose 22. 24 is a tank containing a flocculant, and a suction hose 22 is provided through a valve 23.
It is connected to the. This pump P has a head of 8 in the embodiment.
A 5-stage turbine pump having a discharge port of 5 m and an inner diameter of 2 inches is used. An ejector 25 is connected to the pump P. A pressure tank 26 is connected to the ejector 25, and is provided with a surplus air vent valve 27.

A discharge hose 28 is connected to the pressure tank 26, and is connected via a valve 29 to the fine bubble discharge device 1 installed laterally in water.

Therefore, the strainer 21 and the suction hose 22
The stock solution W sucked into the pump P together with the coagulant is sent to the pressure tank 26 as a gas-liquid mixed solution by the ejector 25 sucking air. The gas-liquid mixed liquid pressurized in the pressure tank 26 becomes a gas solution, is sent out from the pressure tank 26, and is supplied to the fine bubble discharging device 1 by the discharge hose 28.

The gas-dissolved liquid supplied to the inner cylinder 7 is ejected from a large number of minute ejection holes 10 and the flow velocity immediately after ejection from the ejection holes 10 is suppressed by the outer cylinder 14,
The pressure is released all at once, and the gas is discharged from the discharge port 16.
As a result, the gas dissolved in the gas solution, that is, the air, becomes a large number of fine bubbles and floats.

In the case of the embodiment, the fine bubble discharging device 1 has an inner diameter of 2 inches, and the inner cylinder 7 having a length of about 30 cm from the rearmost ejection hole 10a to the frontmost ejection port 10b has 120.
60 ejection holes 10 are provided, and 60 ejection holes 10 are provided.
Was opened, the remaining 60 pieces were closed with screws 12, and the pressure in the pressure tank 26 was maintained at 4 Kg / cm ^{2. The} result was that the proportion of fine bubbles in the discharged amount was the largest. Of course, the inner diameter and the number of the ejection holes 10 can be arbitrarily selected depending on the properties of the stock solution W, the gas solubility and supply pressure of the gas solution, the size of the fine bubble discharging device, and the like.

Although the transparency of the closed water area in this example was 20 cm, the transparency was improved to 150 cm by the aeration and the adsorption and flotation of the flocs of the flocs by this purifying device so that the bottom can be seen. Became.

[0026]

With the device for discharging fine bubbles of the present invention, a large amount of extremely fine bubbles can be generated continuously and the efficiency of dissolving oxygen in water is high. Further, in the purification device using this device, the adsorption rate to the flocs of flocs and the suspended matter is high, and the floating efficiency, and thus the recovery efficiency thereof, are very high.

Since the fine bubble discharging device has a simple structure, it is extremely easy to handle and maintain, and it is safe and low cost.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a fine bubble discharging device.

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

FIG. 3 is a conceptual diagram of a purification device.

[Explanation of symbols]

 1 Micro Bubble Discharge Device 7 Inner Cylinder 10 Jet Hole 12 Screw 14 Outer Cylinder 16 Discharge Port 22 Suction Hoses 24 Tanks Containing Coagulant 25 Ejectors 26 Pressurized Tanks 28 Discharge Hoses P Pump W Undiluted Solution

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiro Okabe 1 at 463 Shimikami, Okayama City, Okayama Prefecture (72) Inventor Toshimitsu Nagayasu No. 3 Inage Coast, Mihama-ku, Chiba City, Chiba Prefecture 702 Inage Flyer Building

Claims (3)

[Claims] 1. A pressurized gas solution is supplied from one end, and a group of ejection holes having a fine inner diameter is provided in an inner cylinder having the other end closed, and at least the gas solution is provided at least outside the group of ejection holes. One of the supply side and the opposite side is opened to form a discharge port, and a fine bubble discharge device provided with an outer cylinder against which the gas-dissolved liquid ejected from the ejection hole group collides. 2. The fine bubble discharging device according to claim 1, wherein the ejection hole can be opened and closed by a male screw member screwed on. 3. The inner cylinder has an inner diameter that is approximately the same as the inner diameter of the discharge hose that supplies the gas-dissolved liquid, and the outer cylinder has an inner diameter that is not more than twice the outer diameter of the inner cylinder. 3. The fine bubble discharging device according to claim 1, wherein the cylinder extends toward the discharge port from a recent ejection hole at a length equal to or larger than the inner diameter of the outer cylinder.