WO2013042197A1 - Waste water treatment equipment in flue gas desulfurization facility - Google Patents

Abstract

[Problem] To make effective trapping of foam or scum from discharged seawater possible with structurally simple equipment. [Solution] Treatment equipment for trapping foam or scum floating on the surface of seawater in the seawater channel that discharges post-absorption seawater in a flue gas desulfurization facility for absorbing and removing sulfur oxides in exhaust gas into seawater, wherein an air lift device (30) is configured from an introducing channel (34) that has an upper opening dam (32) at the upper end thereof and is submerged in the seawater, a pumping channel (36) that is connected to the introducing channel (34) and spans from within the seawater to above the seawater surface, and an air-blowing means (38) that delivers air into the lower part of the pumping channel (36). The equipment is configured so that the dam (32) is disposed in the flow of the seawater and the inflow opening (32A) of the dam is positioned substantially at the surface of the seawater to trap foam or scum floating on the seawater surface from the inflow opening (32A) of the dam using the air lift device (30) and to conduct same outside of the flow of the seawater via the pumping channel (36).

Description

Wastewater treatment equipment in flue gas desulfurization equipment

The present invention relates to a facility for efficiently collecting and treating bubbles and scum floating on seawater generated in a flue gas desulfurization facility for exhaust gas discharged from a coal-fired thermal power plant or the like. For example, the SO ₂ in the flue gases discharged from the thermal power plant, such as those generated upon absorption seawater method flue gas desulfurization, as it can be applied to waste water treatment of the absorbent that has absorbed SO ₂ is there.

Seawater method flue gas desulfurization equipment is known as equipment that absorbs and removes sulfur oxides in exhaust gas discharged from coal-fired thermal power plants. At this time, the absorbing liquid that has absorbed the sulfur component (hereinafter referred to as “waste water”) is discharged into a water channel into which untreated seawater flows, and is mixed with untreated seawater to further aerate to restore PH. Later, it was released into the sea.

In the process of aeration of wastewater mixed with untreated seawater, scum floats simultaneously with countless bubbles on the water surface. Here, “scum” refers to an object that is hard to disappear naturally, such as a solid matter such as boiler combustion fly ash that has floated on the surface of the water and a suspended matter containing gaseous substances such as air. In addition, when the floating state is continued for a long period of time, moisture may scatter from the surface and only solid matter may remain, and this solid matter solidifies so that it cannot be easily broken. Bubbles and scum are thought to be generated by floating on the sea surface together with air entrained in the seawater by aeration bubbles and wastewater turbulence due to the influence of seawater viscosity, ash and marine microorganisms.

The bubbles and scum do not easily disappear and may drift to the ocean release location. Discharging them as they are is undesirable because of environmental pollution or the appearance of foreign matter in seawater.

Therefore, in Patent Document 1, a foam recovery device having a floating structure in which the entire device is floated in a water channel is provided, the foam is separated from the water channel, stored in the foam recovery device, and the stored foam is stored in an ejector pump. And an apparatus for sucking with a vacuum pump and transferring it to a foam treatment apparatus outside the water channel.

In Patent Document 2, a recovery pit is provided on the side of the water channel via an overflow weir, and the overflowed foam is temporarily stored in the recovery pit, and the stored foam is sucked with an ejector pump or a vacuum pump, An apparatus for transferring is disclosed.

Also known is a method of destroying bubbles by spraying. However, spraying is effective to some extent, but it cannot be dealt with if the water level of the waterway fluctuates, causing bubbles to form outside the effective spraying range of the spray, or if the amount of bubbles increases due to time or operating conditions. The present invention is fundamentally unsuitable for facilities for treating a large amount of bubbles and scum floating on the sea surface of a large area generated in a flue gas desulfurization facility.

JP 2008-200260 A

JP 2009-45614 A

According to the previous example, the collected foam is a mixture of gas, liquid and solid, so when transporting with a pump, it will carry air at the same time. When transporting with a vacuum pump, it is necessary to increase the pump capacity. There was a lot of power needed. In particular, depending on the operating conditions and circumstances, the liquid level was not constant due to the sea level, and it was necessary to provide a sufficient amount of suction.

On the other hand, since the liquid and the gas are simultaneously transferred, when sucking with the rotary vacuum pump, the operation is performed in a state in which cavitation is forcibly generated, and there is a concern about vibration and corrosion of the apparatus. Further, since the gas is compressible, the flow rate in the pipe is also slowed down. As a result, solid substances may accumulate in the pipe and the like, and finally the pipe may be blocked.
Due to the necessity of continuous operation, it is necessary to install a spare machine, which requires a significant cost increase.

Therefore, the main problem of the present invention is that it is a structurally simple device, but equipment that efficiently collects and processes bubbles and scum from the discharged seawater. An object of the present invention is to provide a wastewater treatment facility in a flue gas desulfurization facility.

The present invention that has solved the above problems is as follows.

<Invention of Claim 1>
In a flue gas desulfurization facility that absorbs and removes sulfur oxides in exhaust gas, it is a processing facility that collects at least one of bubbles or scum floating on the sea surface of the seawater channel that discharges absorbed seawater. There,
An inlet passage that has an upper opening weir at the upper end and is submerged in seawater, and an air blower that is connected to this introduction passage and feeds air into the seawater and the seawater surface, and to the lower part of the waterway The air lift device with the means,
Install a weir in the flow of seawater and locate the inflow opening of the weir almost on the sea surface.
A flue gas desulfurization facility characterized in that at least one of bubbles and scum floating on the seawater surface is collected by an air lift device from the inflow opening of the weir and led out of the flow of seawater through the pumping channel. Wastewater treatment equipment in

(Function and effect)
As in Patent Documents 1 and 2, when bubbles are collected and transported to a processing place with a rotary vacuum pump, a large amount of air is also transported, which requires a large operating cost. In addition, accumulation and blockage in the transport pipe have also been a serious problem. Furthermore, metal pipes for collection have to use SUS or the like to prevent corrosion due to seawater, which has been a factor of high cost.
On the other hand, using the air lift device according to the present invention, it is found that bubbles and scum can be collected and lifted to the sea surface with only a relatively small amount of air feeding, which is extremely practical. It was done. It is also an advantage of the present invention that there is little accumulation or blockage of bubbles or scum in the airlift device. Furthermore, the equipment cost is extremely low.

<Invention of Claim 2>
The flue gas desulfurization equipment according to claim 1, wherein a guide member that narrows toward the downstream is provided at a position upstream of the seawater flow with respect to the weir, and the weir is provided at a position where the flow is narrowed by the guide member. Wastewater treatment equipment in

(Function and effect)
The flow rate of seawater is relatively slow, about 0.2 to 1.5 m / second, usually about 0.5 to 1.0 m / second. On the other hand, if a guide member that narrows toward the downstream side is provided at a position upstream of the seawater flow with respect to the weir, and a weir is provided at a position where the flow is narrowed by this guide member, bubbles and scum are reliably put into the weir. Can be guided. And, as a means of collecting bubbles and scum, it is not forcibly sucked with a rotary vacuum pump, so there is no flow disturbance when guiding bubbles and scum to the weir, and it can be reliably guided to the weir. is there.

<Invention of Claim 3>
The weir has a partition wall that extends higher than the upper edge of the inflow opening, and the boundary between the inflow opening and the partition wall is located upstream of the center of the weir from the flow of seawater, The wastewater treatment facility in a flue gas desulfurization facility according to claim 1, wherein an opening angle of the line connecting the weir centers in a plan view is 60 to 120 degrees.

(Function and effect)
It has been found that bubbles and scum can be efficiently collected when the opening angle is 60 to 120 degrees. If there is no partition wall, seawater always flows. Therefore, the seawater is collected behind the weir without collecting bubbles and scum, and the foam and scum collection efficiency is lowered.

<Invention of Claim 4>
The flue gas desulfurization equipment according to claim 1, wherein the weir is separate from the introduction path, and the floating is integrated with the weir, and the weir can be moved up and down along the introduction path according to the sea level. Wastewater treatment equipment in

(Function and effect)
Since the weir moves up and down by floating buoyancy following the vertical movement of the sea surface, the foam and scum recovery efficiency is stable regardless of the vertical movement of the sea surface.

<Invention of Claim 5>
The flue gas according to claim 1, wherein a temporary storage portion communicating with the temporary storage portion is provided at an upper portion of the pumping passage, and a downward inclined discharge water passage for allowing liquid containing bubbles and scum to flow down is provided in communication with the temporary storage portion. Wastewater treatment equipment in desulfurization equipment.

(Function and effect)
Bubbles and scum components pumped along the pumping channel can be supplied to the treatment destination through the drainage channel.

<Invention of Claim 6>
A temporary storage unit communicating with the upper portion of the pumping channel is provided, an air exhaust port communicating with the outside air is formed in the temporary storage unit, a collision unit is provided above the upper opening of the pumping channel, and The waste water treatment facility in a flue gas desulfurization facility according to claim 1, wherein a downward sloping drainage channel for allowing a liquid containing foam and scum to flow down is communicated with the temporary storage unit.

(Function and effect)
Defoaming can be achieved by causing the pumped water to collide with a collision portion provided above the pumping path upper end opening. The air exhaust port is for extracting air from bubbles and scum.

<Invention of Claim 7>
The wastewater treatment facility in a flue gas desulfurization facility according to claim 6, wherein an outlet of the discharge channel is provided in a sea channel on the upstream side of the sea water flow or on a sea channel on the downstream side of the weir.

(Function and effect)
When the amount of scum is small, the foam and scum can be completely processed in the temporary storage unit, so that it can be returned to the seawater channel as it is in this embodiment.

<Invention of Claim 8>
In a flue gas desulfurization facility that absorbs and removes sulfur oxides in exhaust gas, it is a processing facility that collects bubbles and scum floating on the sea surface of the sea channel that discharges the absorbed sea water,
An inlet passage that has an upper opening weir at the upper end and is submerged in seawater, and an air blower that is connected to this introduction passage and feeds air into the seawater and the seawater surface, and to the lower part of the waterway A plurality of air lift devices composed of means in the width direction of the flow of seawater,
Each weir is installed in the flow of seawater and the inflow opening of the weir is positioned almost on the seawater surface.
Wastewater treatment equipment in flue gas desulfurization equipment, wherein bubbles and scum floating on the seawater surface are collected by an air lift device from the inflow opening of the weir and guided out of the flow of seawater through the pumping channel .

(Function and effect)
Mass processing is possible by providing a plurality of air lift devices for processing.

<Invention of Claim 9>
The wastewater treatment facility in a flue gas desulfurization facility according to claim 8, wherein the foam and scum flow discharged through the pumping path of each airlift device is guided to the collective pit and the collected foam and scum are collectively processed.

(Function and effect)
Instead of individually processing bubbles and scum from each air lift device, it is configured to collectively process the collected bubbles and scum, thereby reducing processing costs.

<Invention of Claim 10>
Positions on the upstream side of the seawater flow with respect to the weir, a pair of guide members that narrow toward the downstream on both sides of the seawater flow line that passes through each weir, and positions where the flow is narrowed by the pair of guide members The wastewater treatment facility in the flue gas desulfurization facility according to claim 8, wherein the weir is provided on the wastewater.
(Function and effect)
If a weir is provided at a position where the flow is narrowed by the guide member, bubbles and scum can be reliably guided to the weir. And, as a means of collecting bubbles and scum, it is not forcibly sucked with a rotary vacuum pump, so there is no flow disturbance when guiding bubbles and scum to the weir, and it can be reliably guided to the weir. is there.

<Invention of Claim 11>
In the middle of the sea channel, a support body extending over the sea surface from the middle of the seawater depth is provided across the width direction, and a plurality of flow openings are formed through the support body at intervals in the width direction. ,
At the upstream side of the seawater flow of each circulation opening, a pair of guide members that narrow toward the downstream are provided on the left and right sides of the seawater flow line passing through each circulation opening,
The wastewater treatment facility in the flue gas desulfurization facility according to claim 8, wherein a weir of the air lift device is provided at a position downstream of the seawater flow of each circulation opening.

(Function and effect)
Seawater passes through the flow opening of the support, and the weirs are respectively provided downstream of the flow openings. Therefore, the recovery of bubbles and scum is ensured, and the recovery efficiency is increased.

As described above, according to the present invention, when the air lift device is used according to the present invention, it is possible to collect bubbles and scum and lift them to the sea surface with a relatively small amount of air feeding, which is remarkably practical. It was found to be expensive. It is also an advantage of the present invention that there is little accumulation or blockage of bubbles or scum in the airlift device. Furthermore, the equipment cost is extremely low.

It is a top view of the example of the seawater channel of the example of the wastewater treatment facility of this invention. It is the longitudinal cross-sectional view. It is a general | schematic top view of the example of the waste water treatment facility of this invention. It is the AA sectional view. It is a BB line longitudinal cross-sectional view. It is a schematic diagram of an example of an air lift (pump) device. It is a perspective view of the example of a weir. It is an outline sectional view of other examples of the wastewater treatment equipment of the present invention. It is a general | schematic top view of the other example of the wastewater treatment facility of this invention. It is the longitudinal cross-sectional view. It is a general | schematic top view of another example of the wastewater treatment facility of this invention.

An embodiment of a wastewater treatment facility according to the best mode of the present invention will be described with reference to the drawings.
The following description of the preferred embodiment is merely an exemplification, and is not intended to limit the present invention, its application, or its use.

1 and 2 mainly illustrate the waste water and the waste water treatment system.
A sulfur oxide-containing gas such as flue gas discharged from a coal-fired thermal power plant is fed into a desulfurization absorption tower (not shown), and seawater is poured therein. The treated process gas is discharged from the upper part of the desulfurization absorption tower.

The sulfur oxide in the sulfur oxide-containing gas is absorbed into the seawater in the desulfurization absorption tower, and the wastewater 10 as the sulfur oxide absorption liquid (SO2 absorption liquid) is pumped from the sea and returned to the sea. It is inserted from an appropriate position.

As the waste water 10 is introduced, it joins and mixes with seawater, and if necessary, is aerated with a gas supplied from an air diffuser pipe 14 provided in a seawater channel 12 in an appropriate form. Although the gas supplied here will not be specifically limited if it is a gas containing oxygen, air is desirable economically. The finally treated waste water 10 is discharged from the end of the sea channel 12 to the sea. In addition, pH described in FIG. 1 shows the example of seawater pH in a corresponding location.

As described above, in the process of performing aeration (aeration treatment) with seawater, bubbles and scum float on the water surface simultaneously with countless bubbles.
The present invention handles this efficiently and reliably.

The wastewater treatment facility according to the first embodiment of the present invention is provided, for example, at the end portion of the seawater channel 12. That is, for example, as shown in FIG. 3 and FIG. 4, a support 20 made of concrete, for example, made of concrete and extending over the sea surface from the middle of the depth of the seawater 12 across the width direction of the seawater channel 12, It is provided. A plurality of flow openings 21 are formed through the support 20 at intervals in the width direction.

A pair of guide members 16 that narrow toward the downstream are provided on the left and right sides of the seawater flow line passing through each circulation opening 21, and the weir 32 of the air lift device 30 is provided at a position downstream of the seawater flow of each circulation opening 21. It is provided.

Bubbles and scum floating on the water surface are guided to each flow opening 21 by the guide member 16. Here, the guide member 16 is, for example, a corrosion-resistant plate material, preferably a plastic plate material. As another form, as shown in FIG. 8, the float 16A is fixed by a position fixing member 16B provided on the road bottom. Also good. The opening angle θ in a plan view formed by a pair of opposing guide members is 30 to 90 degrees, more preferably 30 to 60 degrees, which has a high effect of inducing bubbles and scum and efficiently collects bubbles and scum. This is desirable because it can be done.

Next, a detailed example of the air lift device 30 is shown in FIG. That is, the airlift device 30 has an upper opening weir 32 at the upper end and is connected to the introduction path 34 that is submerged in seawater. An air blowing means 38 (for example, constituted of a compressor 38A and an air conduit 38B) for supplying air to the lower part of the inside 36 is constituted as an element. In the air lift device 30, the introduction channel 34 and the pumping channel 36 are fixed to the bottom of the seawater channel by a support (not shown).

Using such an air lift device 30, a weir 32 is installed in the flow of seawater, and the inflow opening 32A of the weir is positioned substantially on the seawater surface, and bubbles and scum floating on the seawater surface are caused to flow into the inflow opening 32A of the weir. The air is collected by the air lift device 30 and led to a predetermined position such as the collective pit 46 or a foam treatment facility (not shown) outside the seawater channel via the pumping channel 36. *

The weir 32 is preferably in the form shown in FIG. That is, the entire partition wall is preferably cylindrical with a diameter of 50 to 300 mm (more desirably 100 to 200 mm) and extends higher than the upper edge of the inflow opening 32A (for example, extends higher by about 20 to 80 mm). 32B, the boundary between the inflow opening 32A and the partition wall 32B is located on the upstream side of the flow of seawater from the center of the weir, and the opening angle α in plan view of the line connecting the boundary and the center of the weir is 60 to 180 degrees is desirable. More preferably, it is 60 to 120 degrees. It has been found that bubbles and scum can be efficiently recovered when the opening angle α is 60 to 120 degrees. If there is no partition wall 32B, since seawater always flows, seawater will be collected behind the weir without collecting bubbles and scum, and foam and scum collection efficiency is reduced.

As shown in FIG. 6, the weir 32 is separated from the introduction path 34, and is structured to be fitted to the outside of the introduction path 34 with play. The weir 32 can be moved up and down along the introduction path 34. In this case, it is desirable that the upper edge of the inflow opening 32A is in a state where it has been sunk by about 20 to 30 mm from the sea surface.

Defoaming treatment can be performed on the upper part of the air lift device 30. An example is shown in FIG. That is, the temporary storage part 40 connected to this is provided in the upper part of the pumping path 36, and the temporary storage part 40 is provided with a downward inclined discharge water path 42 through which a liquid containing bubbles and scum flows down. Bubbles and scum components pumped along the pumping channel 36 can be supplied to the processing destination via the discharge channel 42.

In addition, an air exhaust port 44 communicating with the outside air is formed in the temporary storage unit 40, and a collision unit 48 is provided on the upper side facing the upper end opening of the pumping path. Defoaming can be achieved with any impact force by causing pumped water to collide with the collision portion 48 provided on the upper side facing the upper end opening of the pumping path 36. The air exhaust port is for extracting air from bubbles and scum.
The pumping channel has a difference depending on the operation state, but the lift-up seawater and the air volume are almost 1: 1 inside. Therefore, if this separator is provided and air and bubbles or bubbles in scum are separated from seawater, the pipe size after lift-up is sufficient with a small diameter of about 1/4.

As the air blown out from the air conduit 38B, aeration air used for aeration in the sea channel 12 can be used. By blowing in air, it can be lifted up to about 1.5 times the height H of the underwater part (height from the water surface) to 1.5H, and it can be transported using the slope from that height. . If further lift height is required as required, the height can be held again by adding a similar lift-up operation on the way. At this time, since the bubbles were broken at the first lift-up, gas-liquid separation can be achieved by simply storing them with a soot, and a reduction in power can be expected.

It is desirable that the diameter of the weir 32 and the diameter of the flow opening 21 of the narrowest gap (preferably 100 to 500 mm) between the guide members 16 and 16 are substantially coincident with each other. It is desirable that it is within 10%, particularly within 5% of the diameter.

In the example, the fluid is seawater, so it is very corrosive in terms of environment. In the case of metal, it is necessary to use a high-grade material such as titanium. Since the air lift pump does not have a rotating part, it is one of the features that it can be made entirely of resin. Further, the power necessary for operation is air, and in the embodiment, a large amount of air is required in the previous stage. The air lift pump can be operated at a value lower than the air pressure used in the previous stage, and can be operated by using a small part of the previous stage in absolute quantity, and is extremely superior in terms of equipment and power compared to other systems. Is a process.

On the other hand, it is desirable to provide a plurality of air lift devices in the width direction of the seawater flow in order to increase the processing amount.

In this case, as shown in FIG. 3, the discharge of each air lift device 30 is connected to a common discharge water channel 45, the discharged bubbles and scum flow are guided to the collecting pit 46, and the collected bubbles and scum are shown in the shower ring or Batch processing (examples of processing forms are not shown) can be performed by mechanical foam removing means. An opening may be provided below the wall separating the collective pit 46 and the seawater channel so that the seawater in the collective pit is discharged into the seawater channel. In addition, a necessary number of similar air lift devices 30 are installed in the collective pit 46 as necessary, and a separate storage tank is provided. It can be transferred to a defoaming device such as a centrifuge and completely separated into seawater and scum or foam, the seawater can be returned to the sea, and the scum or foam can be dried and discarded.

The support body 20 can support at least a part of the constituent members of the guide member 16 and the air lift device in addition to the advantage of forming the flow opening 21.

Next, a second embodiment is illustrated in FIGS.
The air lift device in this embodiment is the same as that shown in FIGS. 3 and 6, except that the discharge destination of the processing liquid discharged from the air lift device 30 is returned to the seawater channel 12 via the discharge water channel 42A. When the amount of scum is small, since the bubbles and scum can be completely processed by the temporary storage unit 40, it can be returned as it is to the seawater channel as in this embodiment. The return destination may be the upstream seaway 12 or the downstream seaway 12 of the weir 32, but the upstream seaway 12 is particularly preferable in consideration of fluctuations in the amount of scum. Furthermore, it is good to provide the outlet to a sea channel in the position higher than a sea surface. By adopting such a structure, since the treatment liquid is discharged onto bubbles or scum floating on the water surface, an antifoaming effect can be obtained. By the way, in this embodiment, the outflow prevention member 50 is provided on the water surface around the weir 32. The outflow prevention member 50 has a structure like an oil fence, and is opened on the flow opening 21 side. Providing the outflow prevention member 50 has an effect of preventing bubbles and scum that cannot be collected by the weir 32 from flowing out downstream.

A third embodiment is illustrated in FIG.
In this embodiment, a plurality of air lift devices 30, 30... Are provided in series in the water channel width direction. The discharge port of the discharge water passage 42 </ b> B connected to the discharge passage 42 connected to the air lift device is arranged on the upstream side of the air lift device different from the row of the connection source air lift devices 30. Furthermore, it is preferable that the discharge water channel 42 of the air lift device closest to the water channel wall is connected to the foam treatment facility or the pit 46 through the discharge port 42C for processing. According to this configuration, it is possible to obtain a defoaming effect by the processing liquid and finally discharge bubbles and scum that could not be processed by the air lift device 30 to the outside of the seawater channel.

INDUSTRIAL APPLICABILITY The present invention can be used for wastewater treatment of wastewater generated when SO ₂ in flue gas discharged from a thermal power plant is absorbed by a flue gas desulfurization facility.

DESCRIPTION OF SYMBOLS 10 Wastewater 12 Seawater channel 14 Aeration pipe 20 Support body 21 Distribution opening 30 Air lift device 32 Weir 34 Introduction channel 36 Pumping channel 38 Air blowing means 40 Temporary storage part 42 Drainage channel

Claims (11)

In a flue gas desulfurization facility that absorbs and removes sulfur oxides in exhaust gas, it is a processing facility that collects at least one of bubbles or scum floating on the sea surface of the seawater channel that discharges absorbed seawater. There,
An inlet passage that has an upper opening weir at the upper end and is submerged in seawater, and an air blower that is connected to this introduction passage and feeds air into the seawater and the seawater surface, and to the lower part of the waterway The air lift device with the means,
Install a weir in the flow of seawater and locate the inflow opening of the weir almost on the sea surface.
A flue gas desulfurization facility characterized in that at least one of bubbles and scum floating on the seawater surface is collected by an air lift device from the inflow opening of the weir and led out of the flow of seawater through the pumping channel. Wastewater treatment equipment in The flue gas desulfurization equipment according to claim 1, wherein a guide member that narrows toward the downstream is provided at a position upstream of the seawater flow with respect to the weir, and the weir is provided at a position where the flow is narrowed by the guide member. Wastewater treatment equipment in The weir has a partition wall that extends higher than the upper edge of the inflow opening, and the boundary between the inflow opening and the partition wall is located upstream of the center of the weir from the flow of seawater, The wastewater treatment facility in a flue gas desulfurization facility according to claim 1, wherein an opening angle of the line connecting the weir centers in a plan view is 60 to 120 degrees. The flue gas desulfurization equipment according to claim 1, wherein the weir is separate from the introduction path, and the floating is integrated with the weir, and the weir can be moved up and down along the introduction path according to the sea level. Wastewater treatment equipment in The flue gas according to claim 1, wherein a temporary storage portion communicating with the temporary storage portion is provided at an upper portion of the pumping passage, and a downward inclined discharge water passage for allowing liquid containing bubbles and scum to flow down is provided in communication with the temporary storage portion. Wastewater treatment equipment in desulfurization equipment. A temporary storage unit communicating with the upper portion of the pumping channel is provided, an air exhaust port communicating with the outside air is formed in the temporary storage unit, a collision unit is provided above the upper opening of the pumping channel, and The waste water treatment facility in a flue gas desulfurization facility according to claim 1, wherein a downward sloping drainage channel for allowing a liquid containing foam and scum to flow down is communicated with the temporary storage unit. The wastewater treatment facility in the flue gas desulfurization facility according to claim 6, wherein the outlet of the discharge channel is provided in the sea channel on the upstream side of the sea water flow or on the downstream sea channel with respect to the weir. In a flue gas desulfurization facility that absorbs and removes sulfur oxides in exhaust gas, it is a processing facility that collects bubbles and scum floating on the sea surface of the sea channel that discharges the absorbed sea water,
An inlet passage that has an upper opening weir at the upper end and is submerged in seawater, and an air blower that is connected to this introduction passage and feeds air into the seawater and the seawater surface, and to the lower part of the waterway A plurality of air lift devices composed of means in the width direction of the flow of seawater,
Each weir is installed in the flow of seawater and the inflow opening of the weir is positioned almost on the seawater surface.
Wastewater treatment equipment in flue gas desulfurization equipment, wherein bubbles and scum floating on the seawater surface are collected by an air lift device from the inflow opening of the weir and guided out of the flow of seawater through the pumping channel . The wastewater treatment facility in the flue gas desulfurization facility according to claim 8, wherein the foam and scum flow discharged through the pumping path of each airlift device is guided to the collective pit and the collected foam and scum are collectively processed. Positions on the upstream side of the seawater flow with respect to the weir, a pair of guide members that narrow toward the downstream on both sides of the seawater flow line that passes through each weir, and positions where the flow is narrowed by the pair of guide members The wastewater treatment facility in the flue gas desulfurization facility according to claim 8, wherein the weir is provided in the wastewater desulfurization facility. In the middle of the sea channel, a support body extending over the sea surface from the middle of the seawater depth is provided across the width direction, and a plurality of flow openings are formed through the support body at intervals in the width direction. ,
At the upstream side of the seawater flow of each circulation opening, a pair of guide members that narrow toward the downstream are provided on the left and right sides of the seawater flow line passing through each circulation opening,
The wastewater treatment facility in the flue gas desulfurization facility according to claim 8, wherein a weir of the air lift device is provided at a position downstream of the seawater flow of each circulation opening.

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