JPS5854166Y2 - Water sprinkler type defoaming device - Google Patents

Description

[Detailed explanation of the invention] This invention is a highly foaming liquid (hereinafter referred to as foaming liquid).
This invention relates to a water sprinkling type defoaming device that destroys and disposes of foam generated from water by sprinkling water.

Such defoaming devices are used, for example, in water treatment equipment using ozone.

FIG. 1 shows an example in which a defoaming device is applied to unreacted surplus ozone (hereinafter referred to as exhaust ozone) generated during ozone treatment of wastewater.

The wastewater to be ozonated often has foaming properties itself or reacts with ozone to produce foaming substances.

Therefore, exhaust ozone also often enters the downstream exhaust ozone decomposition device accompanied by foam, deteriorating the performance of the decomposer.

Therefore, conventionally, as shown in Fig. 1, a foamy liquid containing exhaust ozone is introduced into a treatment tower 2 through an introduction pipe 1, and fresh water is injected into it from a water spray nozzle 3 located above the tower to destroy the foam. The waste ozone separated from the liquid component is taken out from the discharge pipe 4 at the top of the tower, and the liquid component is sequentially discharged to the outside of the tower through a drain pipe 5 such as a siphon breaker together with the jet water.

However, in this case, the pressure of the fresh water was not necessarily constant, and the force of the water sprinkling was also not stable.

Moreover, the foamed liquid contains a large amount of 53% due to the flotation effect in the ozonation reaction tower (not shown) at the previous stage.

For this reason, 53 min is mixed in a concentrated form in the aqueous liquid discharged outside the tower, and it is unfavorable from an environmental hygiene standpoint to discharge this as it is into a river or the like.

Therefore, this effluent is collected from the SS removal equipment, Mihara's coagulation sedimentation tank,
Normally, it is returned to a filtration tank and subjected to another 35-minute removal process, but with conventional defoaming devices that use a large amount of fresh water, not only does the cost of fresh water increase, but it also increases the capacity load of the SS removal device. There was a drawback to making it bigger.

The present invention provides a defoaming device that can eliminate the above drawbacks without impairing the defoaming function and is excellent in both performance and economy.

Hereinafter, the present invention will be explained in detail based on the embodiment shown in FIG.

In the figure, 1 is a foam liquid introduction pipe corresponding to 1 in FIG. 1, 2 is a treatment tower, 30 and 32 are water nozzles, 4 is a gas discharge pipe, and 5 is a discharge pipe.

The introduction pipe 1 is provided at the top of the treatment tower 2, and is designed so that some of the bubbles in the tower are destroyed by impact by dropping the foam liquid from the top of the tower.

In the present invention, the water spray nozzles 31, 3□ are provided in two lines as shown in the figure, and one nozzle 3 circulates the foamy liquid introduced into the tower, so that the introduced liquid is passed from the water outlet 6 at the bottom of the tower to the pressurizing pump. 7, and from there, it is provided so as to be circulated back to the water spray nozzle 3 via a manual valve 8 and a liquid meter 9.

A fresh water source (not shown) is connected to the other water spray nozzle 32 via a manual valve 10, so that fresh water can also be sprayed as needed.

On the other hand, the drain pipe 5 may be of the siphon-on-breaker type as shown in FIG. A manual valve 11 is provided.

The intermittent operation of the pressurizing pump 7 will be described in detail later in the explanation of its function, but when the pump is operated intermittently, power consumption can be reduced and the economic effect can be further increased.

- Because the UL pressure pump 7 operates intermittently, the processing tower 2
The upper liquid level gauge 12 detects the -L limit NH of the liquid level of the introduced liquid.
A detection signal is manually input to the controller 14 of the pump 7 to start the pump 7, and a lower liquid level gauge 13 detects the lower limit position of the liquid level, and the pressure pump 7 is stopped by the detection signal. .

Next, the effect will be explained.

First, when treating a normal foamy liquid, the manual valves 8 and 11 associated with the water spray nozzle 31 are opened, and the foamy liquid is introduced into the treatment tower 2 in this state.

When the liquid level of the introduced liquid reaches the upper limit position H, the pressurizing pump 7 starts to handle the introduced liquid in the tower, and a part of it is sent to the water spray nozzle 3.
The remaining liquid is injected into the tower from , and the remainder of the treated liquid is discharged to the outside of the apparatus through a drain pipe 5.

At this time, if the manual valves 8 and 11 are adjusted so that the amount of liquid discharged outside the device is greater than the amount of foamed liquid introduced, the liquid introduced into the tower will gradually become sluggish, and the liquid level will reach the lower limit. When the pressure pump 7 is lowered to this position, the pressure pump 7 stops.

As a result, the level of the introduced liquid rises again, and at the same time as reaching the upper limit position H, watering is restarted.

In this way, water sprinkling is repeated intermittently, and the liquid introduced into the column is defoamed.

Since the defoaming treatment described above mainly relies on the physical destructive action of water spraying, there is hardly any decrease in the treatment effect due to the circulating use of the introduced liquid.

Rather, the introduced liquid is handled by the pressure pump 7.
The economic effects of this are far greater, such as improving the treatment effect by powerful and stable spraying from the tank, and eliminating the need for fresh water by circulating the introduced liquid. When combined with intermittent operation of the pump, significant savings can be made in both water and electricity costs.

In addition, when processing a particularly strong foaming liquid or when the amount of introduced liquid is low and water for sprinkling is insufficient, the manual valve 10 connected to the water sprinkling nozzle 3° is further opened to perform water sprinkling with fresh water.

In this case, it goes without saying that the opening degree of the manual valve 10 is adjusted to obtain the required amount of fresh water, but also
1 is also adjusted so that the amount of water flowing into the tower does not exceed the amount of drainage.

By adding fresh water sprinkling, it is possible to achieve a treatment effect that exceeds that of conventional equipment at a small expense.

As mentioned above, the defoaming device of the present invention not only performs stable and powerful defoaming, but also has excellent economic efficiency, reducing equipment maintenance and operation costs, and reducing the amount of water discharged outside the device. For example, when used for exhaust ozone treatment in water treatment equipment, the capacity of the SS removal device can be reduced, which has the effect of lowering equipment costs and operating costs.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an example of a conventional defoaming device, and FIG. 2 is a system diagram showing an example of the foam defoaming device of the present invention. Explanation of symbols in the diagram 1. Foam liquid introduction pipe, 2: treatment tower,
3□, 32: Water nozzle, 4: Gas discharge pipe, 5. Drain pipe, 6: Water outlet, 7: Pressure pump, 8, 10.11: Manual valve, 12.13: Level gauge, 14: Controller.

Claims (1)

[Scope of utility model registration request] In a water sprinkling type defoaming device that is equipped with a water spray nozzle in the upper part of the treatment tower and defoams a strongly foaming liquid introduced into the treatment tower by spraying water, a water spraying type defoaming device is used for recycling and reusing the introduced liquid taken out from the treatment tower. A circulation water sprinkling system equipped with a pressure pump 7 and a water sprinkling nozzle 3 is provided, and a part of the introduced liquid pumped up by the pressure pump is discharged to the outside of the defoaming device, and the level of the introduced liquid in the treatment tower is raised to the level of the introduced liquid. A water sprinkling type defoaming tower, characterized in that the water sprinkling from the nozzle is repeated intermittently in response to the above, and is provided with another water sprinkling system equipped with a water sprinkling nozzle 3° connected to a fresh water source.