JP2021137708A - Inclined plate device cleaning method and precipitation equipment - Google Patents

Abstract

To provide an inclined plate device cleaning method according to which the inclined plate device can be installed even in a lower precipitation basin.SOLUTION: An inclined plate device cleaning method is used for precipitation treatment for capturing suspension particles remaining in precipitation treatment water via an inclined plate device 16 installed below water surface of a precipitation basin 3 and collecting treatment water that has passed through the inclined plate device 16 by use of a water collection unit 18 located opposite to the inclined plate device 16. This method includes: a first process in which the inclined plate device 16 is exposed from water by pushing down water level of the precipitation basin 3; and a second process in which the inclined plate device 16, which has been exposed from water in the first process 1, is cleaned by cleaning water discharged from a cleaning unit located opposite to the inclined plate device 16.SELECTED DRAWING: Figure 5

Description

The present invention relates to a method for cleaning an inclined plate device and a settling facility.

The number of sewage treatment facilities that need to be completely renewed is increasing due to aging, and at that time, many sewage treatment facilities are required to increase the sewage treatment capacity of existing facilities. In order to meet this demand, the processing capacity of the final settling basin is being improved by introducing an inclined plate device as described in Patent Document 1.

In large cities where land prices are high and it is difficult to secure a sufficient site area, there are increasing cases of adopting two-layer settling basins in which sedimentation basins are constructed in the upper and lower layers in order to reduce the space of the final settling basin. There is. There is also an example of adopting a multi-layered sedimentation basin having two or more layers for the same purpose.

JP-A-2017-60931

When the above-mentioned inclined plate device is adopted, the water level of the treated water flowing into the settling basin is lowered once every 3 to 6 months to expose the inclined plate device upward from the water surface, and the inclined plate device is exposed on the upper surface of the inclined plate. Work is required to remove accumulated sludge and propagated algae. Therefore, it is necessary to stop the inflow of the treated water into the settling basin and to draw out about half of the treated water flowing into the settling basin and return it to the biological treatment tank.

When a sloping plate device is used for a two-layer settling basin, in order to clean the sloping plate device installed in the lower settling basin, the entire amount of treated water in the upper settling basin is drawn out and the lower layer settling basin is used. It is necessary to draw out about half of the treated water, and in the biological treatment tank where the drawn treated water is returned, the HRT will be shortened and the MLSS concentration will be disturbed, leading to an increase in the water area load of other final settling basins in operation. There is also a problem that the operation rate of the sewage treatment facility as a whole is greatly reduced because the operation of two water channels is stopped.

In addition, since it is difficult to inspect and maintain the lower layer settling basin, it has not been possible to substantially adopt the inclined plate device for the lower layer settling basin.

In view of the above-mentioned problems, an object of the present invention is to provide a method for cleaning the inclined plate device and a settling facility capable of installing the inclined plate device even in a lower layer sedimentation basin.

In order to achieve the above object, the first characteristic configuration of the method for cleaning the inclined plate device according to the present invention is to remove suspended particles remaining in the sedimentation treated water through the inclined plate device arranged below the water surface of the settling pond. A method for cleaning the inclined plate device, which is used for sedimentation treatment of capturing and collecting treated water that has passed through the inclined plate device by using a water collecting device arranged opposite to the inclined plate device. The first step of exposing the inclined plate device from the water by pushing down the water level, and the cleaning water for discharging the inclined plate device exposed from the water in the first step from the cleaning device arranged to face the inclined plate device. It is a point including a second step of cleaning by.

After executing the first step of pushing down the water level of the settling basin to expose the inclined plate device from the water, the cleaning device arranged opposite to the inclined plate device is used to discharge cleaning water to clean the exposed inclined plate device. By executing the two steps, the inclined plate device can be washed without drawing out the water to be treated in the settling basin.

In the second feature configuration, in addition to the first feature configuration described above, the water collector is used as the cleaning device that discharges the cleaning water in the second step, and the cleaning that is discharged from the water collecting device is used. The point is to wash the inclined plate device with water.

When a water collecting device is used as a cleaning device for cleaning the inclined plate device, it is not necessary to install a separate cleaning device, and it is possible to reduce the equipment cost. The water collecting device can realize two functions by collecting the treated water that has passed through the inclined plate device during the sedimentation treatment and discharging the cleaning water from the water collecting device during the cleaning treatment of the inclined plate device. ..

In the third feature configuration, in addition to the second feature configuration described above, the water collecting device includes a plurality of water collecting pipes in which a plurality of water collecting holes are dispersedly arranged on the peripheral surface, and the water collecting device is provided through the water collecting holes. The point is that the treated water that has passed through the inclined plate device is collected and the washing water is discharged through the water collecting hole.

It is preferable that the water collecting device is provided with a plurality of water collecting pipes in which a plurality of water collecting holes are dispersedly arranged on the peripheral surface, and at the time of collecting water, the treated water that has passed through the inclined plate device is collected through the water collecting holes. When the inclined plate device is washed with water, the inclined plate device is washed with the washing water discharged from the water collecting hole.

In the fourth feature configuration, in addition to any of the first to third feature configurations described above, the sedimentation basin is formed in a closed space at least above, and the first step supplies gas to the closed space. Then, the pressure of the gas pushes down the water level of the settling basin to expose the inclined plate device from the water.

When the gas is supplied to the closed space in the first step, the pressure acts on the liquid surface of the treated water to push the treated water downward. As a result, the inclined plate device can be exposed from the water without drawing a large amount of treated water from the settling basin.

The first characteristic configuration of the settling facility according to the present invention is a settling pond in which at least the upper part is formed in a closed space to settle and separate suspended particles in the treated water, and a settling pond arranged below the water surface of the settling pond and remaining in the settling treated water. An inclined plate device that captures suspended particles, a water collecting device that collects treated water that is arranged opposite to the inclined plate device and has passed through the inclined plate device, and a water collecting device that supplies gas to the closed space to provide a sedimentation pond. It is provided with an air supply device that exposes the inclined plate device from water by lowering the water level, and a cleaning device that discharges cleaning water that cleans the inclined plate device exposed from water by supplying air from the air supply device. There is a point.

Most of the suspended particles in the water to be treated that have been introduced into the settling basin are separated from the water to be treated by free sedimentation and / or interfacial sedimentation and settle on the bottom surface. Then, the suspended particles remaining in the settling treated water after most of the suspended particles have settled are captured by the inclined plate device when the treated water passes through the inclined plate device, and the treatment after the suspended particles are captured. Water is collected by the water collector. The number of suspended particles remaining on the inclined plate device without settling from the inclined plate device to the bottom of the sedimentation pond increases, or algae grow on the inclined plate device, and the effect of capturing the suspended particles by the inclined plate device decreases. In such a case, by supplying gas from the air supply device to the closed space, the surface of the treated water can be pushed down to expose the inclined plate device from the surface of the treated water, and the cleaning water discharged from the cleaning device can be used. The tilt plate device can be automatically cleaned without human intervention.

In the second feature configuration, in addition to the first feature configuration described above, the water collecting device is also used as the cleaning device, and is arranged in a region corresponding to the installation area of the inclined plate device in a plan view and has a peripheral surface. A plurality of water collecting pipes in which a plurality of water collecting holes are dispersedly arranged are provided, and the treated water that has passed through the inclined plate device is collected through the water collecting holes, and the washing water is collected through the water collecting holes. The point is that it is configured to discharge.

At the time of the precipitation treatment, the supernatant is collected from a plurality of water collecting pipes in which a plurality of water collecting holes are dispersedly arranged on the peripheral surface, and at the time of washing, the washing water is discharged from the water collecting holes. Since the water collecting device and the cleaning device are shared, the equipment cost can be reduced.

In addition to the first or second feature configuration described above, the third feature configuration includes the ceiling wall of the settling basin and a block hanging from the ceiling wall so that the enclosed space covers at least the inclined plate device. It is at a point formed by the flow wall and the side wall of the sedimentation basin.

A closed space is formed by the ceiling wall arranged so as to cover the inclined plate device, the blocking wall hanging from the ceiling wall, and the side wall of the settling basin, so that the gas necessary for exposing the inclined plate device from the water is supplied. The amount can be suppressed and the cleaning work can be performed efficiently.

The fourth characteristic configuration is that, in addition to any of the first to third characteristic configurations described above, a degassing tube for drawing out the gas supplied to the enclosed space to the outside is provided.

The gas supplied to the closed space after the cleaning of the inclined plate device is completed is exhausted to the outside through the water collecting device, but at least the water level is exhausted to the extent that the water collecting device is immersed in the treated water. Therefore, there is a risk that the amount of water collected during the sedimentation treatment will decrease. If a degassing pipe is provided in preparation for such a case, the gas supplied to the closed space can be exhausted to the outside without remaining.

In addition to any of the first to fourth feature configurations described above, the fifth feature configuration is a scum that extends from the ceiling wall on the inflow side of the water to be treated to the blocking wall and the downstream side slopes downward. It is equipped with a discharge guide wall.

When the scum in which suspended particles mixed in the treated water are aggregated floats on the surface of the treated water and sticks to the ceiling wall that slopes upward toward the downstream side of the flow of the treated water and gradually grows, the water in the sedimentation basin is pulled out. It cannot be easily removed even when it is cleaned. In preparation for such a case, by providing a scum discharge guide wall that extends from the ceiling wall on the inflow side of the treated water to the blocking wall and inclines downward on the downstream side, the scum is discharged along with the flow of the treated water. By ascending along the ceiling wall, sticking to the ceiling wall and accumulation can be avoided.

As described above, according to the present invention, it has become possible to provide a cleaning method and a settling facility for a inclined plate device, which enables the inclined plate device to be installed even in a lower layer sedimentation basin.

(A) is an explanatory view of a cross-sectional view of a two-layer settling basin according to the present invention, (b) is an explanatory view of a plan view of a water collecting device, and (c) is an explanatory view of a plan view of an inclined plate device. (A) is an explanatory view of a plan view showing another aspect of the water collecting device, (b) is an explanatory view of a plan view showing still another aspect of the water collecting device, (c), (d), (e). Is an explanatory diagram of the water collecting pipes that make up the water collecting device. Explanatory drawing when the upper and lower settling basins that make up the two-layer settling basin are in operation (A) is an explanatory view of a state in which a part of the treated water is pulled out at the time of cleaning the inclined plate device provided in the upper sedimentation basin, and (b) is an explanatory view of a state in which the inclined plate device is cleaned by the cleaning device. (A) is an explanatory view of a state in which the water surface of the treated water is pushed down during cleaning of the inclined plate device provided in the lower sedimentation basin, and (b) is an explanatory view of a state in which the water collecting device is used as a cleaning device to clean the inclined plate device. Explanatory drawing of the state Explanatory drawing of the state where air is drawn from the lower sedimentation basin after cleaning

Hereinafter, an example of applying the method for cleaning the inclined plate device and the settling facility according to the present invention to the final settling basin of the water treatment facility for biologically treating organic wastewater such as sewage will be described with reference to the drawings.

[Structure of sedimentation equipment]
As shown in FIG. 1A, the settling facility 1 is a two-layer settling basin composed of a concrete skeleton and having settling basins 2 and 3 in the upper layer and the lower layer, respectively. An inflow channel 4 and a diversion channel 5 are provided on the upstream side, and a sludge pit 6 is provided below the diversion channel 5.

The water to be treated from the biological treatment tank of the water treatment facility is guided to the inflow channel 4, and is divided into the upper sedimentation basin 2 and the lower sedimentation basin 3 by the diversion channel 5. The inflow channel 4 is provided with a gate 4g that allows or stops the inflow of water to be treated. Although not shown, the inflow port 2a of the upper settling basin 2 and the inflow port 3a of the lower settling basin 3 formed in the diversion channel 5 also allow the inflow of the water to be treated into the settling basins 2 and 3. There is a gate to stop or stop.

Both the bottoms 2b and 3b of the settling basins 2 and 3 are formed on an inclined bottom in which the inflow side of the water to be treated is inclined downward from the outflow side, and sludge scraping devices 10 and 11 are provided in each of the settling basins 2 and 3, respectively. It is provided.

The sludge scraping devices 11 and 12 are between a pair of endless chains (indicated by an alternate long and short dash line in the figure) wound between a plurality of support shafts including a support shaft for driving and a pair of endless chains. It is composed of a plurality of flight plates attached over the span and a long guide rail that supports the flight plates that move along with the running of the endless chain from below. The sludge is constructed so as to be scraped toward the sludge pit 6 by a flight board. The sludge accumulated in the sludge pit 6 is returned to the biological treatment tank by the return pump P1.

Blocking walls 13 and 14 for blocking the flow of treated water are provided in each of the settling basins 2 and 3, and inclined plate devices 15 and 16 are arranged below the water surface on the downstream side of the blocking walls 13 and 14. This is the water to be treated (hereinafter referred to as "precipitation treated water") in which the suspended particles containing activated sludge have settled on the upstream side of the blocking walls 13 and 14, and the suspended particles have not sufficiently settled and the suspended particles remain. However, the suspended particles are captured by the inclined plate devices 15 and 16 in the process of flowing from the lower side to the upper side of the inclined plate devices 15 and 16 through the lower part of the blocking walls 13 and 14. Then, the supernatant is collected as treated water by the water collecting devices 17 and 18 and drained to the water storage tank 20.

FIG. 1 (c) shows the tilt plate device 16 in a plan view. In the inclined plate devices 15 and 16, the inclined flow in which plate-like bodies having a length of 1.0 to 1.5 m inclined at an inclination angle of about 60 degrees with respect to the horizontal plane are arranged at predetermined intervals (for example, 0.1 m). It consists of roads. When the sedimentation-treated water flows from the bottom to the top along the inclined flow path, the suspended particles are trapped on the surface of the plate-shaped body, so that the suspended particles are separated from the sediment-treated water and deposited on the surface of the plate-shaped body. The suspended particles are configured to slide off the surface of the plate-like body due to its own weight. The smaller the inclination angle of the plate-like body, the higher the separation effect of the suspended particles, but the inclination angle θ is preferably about 60 degrees because the accumulated suspended particles slide down. The inclination direction may be the downstream side or the upstream side, and both may be arranged alternately.

The water collecting device 17 of the upper sedimentation basin 2 is composed of an overflow trough, and the treated water that has passed through the inclined plate device 15 flows into the water storage tank 20 from the overflow trough. FIG. 1B shows a water collecting device 18 provided in the lower sedimentation basin 3. The water collecting device 18 of the lower sedimentation basin 3 is arranged to face the inclined plate device 16 so as to cover the installation area of the inclined plate device 16, and a plurality of water collecting pipes 18a in which a plurality of water collecting holes h are dispersedly arranged on the peripheral surface. It is configured with.

A plurality of water collecting pipes 18a are connected to a header pipe 18b that is watertightly fixed to the side wall of the settling basin 3, and are connected to a pumping pipe 22 arranged near the side wall of the settling basin 3 via the header pipe 18b. The treated water that has flowed into the water collecting pipe 18a from the water collecting hole h rises in the pumping pipe 22 due to the head difference from the water tank 20 and is pumped into the water tank 20.

FIG. 1B illustrates a water collecting device 18 in which a plurality of water collecting pipes 18a are arranged along a direction intersecting the flow direction of the treated water in the lower sedimentation tank 3. However, the configuration of the water collecting device 18 is not limited to such an aspect, and as shown in FIG. 2A, a plurality of water collecting pipes 18a are arranged mainly along the flow direction of the treated water. Also, as shown in FIG. 2B, a plurality of water collecting pipes 18a arranged along a direction intersecting the flow direction of the treated water in the settling tank 3 are provided, and one end side of the water collecting pipe 18a is a header pipe 18b. It may be configured to be connected to. It suffices that the water collecting pipes 18a are arranged so that the water collecting holes h are dispersedly arranged in the entire area of the inclined plate device 16 at least in a plan view.

Further, as shown in FIG. 2 (c), the water collecting hole h is arranged on the upper surface of the water collecting pipe 18a along the axis of the water collecting pipe 18a, as shown in FIG. 2 (d). A mode in which the holes h are arranged on the lower surface of the water collecting pipe 18a along the axis of the water collecting pipe 18a, a mode in which the water collecting holes h are arranged along the left and right side surfaces of the water collecting pipe 18a as shown in FIG. Can be adopted. Further, the water collecting pipe 18a may have a rectangular cross section in addition to the circular cross section.

A scum gap 19 is installed in the upper sedimentation tank 2, and the scum floating on the surface of the water to be treated is guided to the scum gap 19 by the flight plate of the sludge scraping device 11 and collected. The bottom 2b of the upper sedimentation basin 2, that is, the ceiling wall of the lower sedimentation basin 3, is provided with a scum discharge guide wall 21 extending from the inflow side of the water to be treated to the blocking wall 14 and inclining downward on the downstream side. There is.

When the scum discharge guide wall 21 is not provided, the scum mixed in the water to be treated floats on the surface of the treated water and sticks to the ceiling wall inclined upward toward the downstream side of the flow of the treated water and gradually grows. However, even when the water in the settling basin 3 is drawn out for cleaning, it cannot be easily removed. In preparation for such a case, the scum is provided on the scum discharge guide wall 21 by providing a scum discharge guide wall 21 that extends from the ceiling wall on the inflow side of the water to be treated to the blocking wall 14 and inclines downward on the downstream side. By floating along the ceiling wall, sticking and accumulation on the ceiling wall can be avoided. At this time, the surfaced scum reaches the water surface of the upper sedimentation basin, and then is guided by the flight plate of the sludge scraping device 10 to the scum gap 19 and collected.

[Operating sedimentation basin]
FIG. 3 shows a case where both the upper sedimentation basin 2 and the lower sedimentation basin 3 are in operation. When the water to be treated that has flowed into the inflow channel 4 is divided by the diversion channel 5, a part of the water flows into the upper sedimentation basin 2 from the inflow port 2a, and a part of the treated water flows into the lower sedimentation basin 3 from the inflow port 3a. Suspension particles settled in the settling tanks 2 and 3, and a part of them settled in the sludge pit 6 directly below. It is squeezed by 6.

The scum S floating on the water surface of the upper sedimentation tank 2 is collected by the sludge scraping device 10 in the scum gap 19, and the scum S floating on the water surface of the lower sedimentation tank 3 is collected on the scum discharge guide wall 21 by the sludge scraping device 11. It is transported further downstream along the line.

The treated water flowing down to the downstream side passes under the blocking walls 13 and 14 and flows from the lower side to the upper side of the inclined plate devices 15 and 16, and the suspended particles are captured by the inclined plate devices 15 and 16.

The suspended particles deposited on the inclined plates of the inclined plate devices 15 and 16 slide down toward the bottoms of the settling basins 2 and 3, but as the operating time becomes longer, the suspended particles gradually adhere to the inclined plate and accumulate thickly. In addition, algae will grow on the inclined plate, and the removal performance of suspended particles will decrease. Therefore, for example, it is necessary to clean the inclined plate devices 15 and 16 once every 3 to 6 months.

[Cleaning of the inclined plate device placed in the upper sedimentation basin]
When cleaning the inclined plate device 15 provided in the upper sedimentation basin 2, the cleaning work is performed according to the following procedure.
As shown in FIG. 4A, first, the inflow port 2a formed in the diversion channel 5 is closed, and the return pump P1 is driven to expose the water surface of the settling basin 2 so that the inclined plate device 15 is exposed. Decrease. If necessary, the opening degree of the gate 4g is adjusted to suppress the inflow of treated water.

As shown in FIG. 4B, when the inclined plate device 15 is exposed from the water surface, the inclined plate device 15 is cleaned by discharging cleaning water from the cleaning device 30 arranged to face the inclined plate device 15 in that state. As the cleaning device 30, the same configuration as that of the water collecting device 19 described above can be adopted, and the treated water stored in the water storage tank 20 can be used as the cleaning water. For example, a plurality of watering pipes may be arranged so as to cover the installation area of the inclined plate device 15 in a plan view, and a watering nozzle may be formed on the surface of each watering pipe. By supplying the treated water to each sprinkler pipe by the pump P2, the suspended particles and the propagated algae accumulated on the inclined plate device 15 are washed away by the washing water discharged from each nozzle.

After that, the inflow port 2a formed in the diversion channel 5 is opened to guide the treated water to the settling tank 2 to return to the operating state. Note that, in FIGS. 4 (a) and 4 (b), the sludge scraping devices 10 and 11 are omitted in order to avoid the complexity of the drawings.

[Cleaning of the inclined plate device placed in the lower sedimentation basin]
When the water to be treated in the settling basin 3 is pulled out to expose the inclined plate device 16 in order to clean the inclined plate device 16 provided in the lower layer settling basin 3, the water to be treated in the upper layer settling basin 2 is also drawn out. Needed and very inefficient.

Therefore, the air supply device that exposes the inclined plate device 16 from the water by supplying gas to the closed space to lower the water level of the settling basin and the inclined plate device 16 that is exposed from the water by the air supply from the air supply device are washed. It is equipped with a cleaning device that discharges cleaning water.

As shown in FIG. 1A, the blower F is connected to the pumping pipe 22 via the air supply pipe 23, and the washing water pump P3 is connected to the pumping pipe 22 via the washing water pipe 24. Further, a motor-driven valve V1 is arranged in the pumping pipe 22, a motor-driven valve V2 is arranged in the air supply pipe 23, and a motor-driven valve V3 is arranged in the washing water pipe 24.

When the settling basin 3 is in operation, the valves V2 and V3 are closed and the valve V1 is opened so that the treated water collected through the water collecting device 18 is pumped into the water storage tank 20.

As shown in FIG. 5A, when cleaning the inclined plate device 16, the inflow port 3a formed in the diversion channel 5 is first closed, and the opening degree of the gate 4g is adjusted as necessary. Suppress the inflow of treated water.

Next, after closing the valve V1 and stopping the pumping, the valve V2 is opened and the air from the blower F is press-fitted through the air supply pipe 23. The surrounding space of the inclined plate device 16 arranged in the lower sedimentation basin 3 is the bottom 2b of the upper sedimentation basin 2, that is, the ceiling wall of the lower sedimentation basin 3, the blocking wall 14, and the three streams of the sedimentation basin 3. It is formed in a closed space by road walls (left and right side walls and downstream side walls that make up the flow path). Therefore, the water level of the settling basin 3 is pushed down by the air compressed from the air supply pipe 23, and the inclined plate device 16 is exposed from the water. That is, the air supply device is composed of the air supply pipe 23, the blower F, and the valve V2.

As shown in FIG. 5B, when the inclined plate device 16 is exposed from the water surface, the valve V2 is closed, the blower F is stopped, the valve V3 is opened, the pump P3 is started, and the pump P3 is collected from the washing water pipe 24. Washing water is supplied to the water collecting pipe 18a (see FIG. 1B) of the water device 18. Suspension particles and propagated algae deposited on the inclined plate device 15 are washed away by the washing water discharged from the water collecting pipe 18a. That is, the water collecting device 18 is configured to function as a cleaning device. When the cleaning of the inclined plate device 16 is completed, the valve V3 is closed, the pump P3 is stopped, and then the valve V1 of the pumping pipe 22 is opened. Note that, in FIGS. 5A and 5B, the sludge scraping devices 10 and 11 are omitted in order to avoid the complexity of the drawings.

As shown in FIG. 6, when the valve V1 is opened, the treated water flows in from the water collecting hole h formed in the water collecting pipe 18a by the water pressure of the settling basin 3 and is pumped into the water storage tank 20 through the pumping pipe 22. The air press-fitted into the closed closed space is degassed to the outside through the degassing pipe 25 and the pumping pipe 22. The degassing pipe 25 is installed on the downstream side wall via a sealing member, one end of which opens to the upper part of the closed closed space, and the other end of which is connected to the pumping pipe 22.

After that, the inflow port 3a formed in the diversion channel 5 is opened to guide the water to be treated to the settling tank 3 to return to the operating state. In FIG. 6, the sludge scraping devices 10 and 11 are omitted in order to avoid the complexity of the drawings.

As described above, according to the present invention, the operating state of the upper layer sedimentation basin 2 can be maintained even when the lower layer sedimentation basin 3 is washed.

It is also possible to install a dedicated cleaning device together with the water collecting device 18 above the inclined plate device 16 of the lower layer sedimentation basin 3.

In order to seal the upper space of the inclined plate device 15 installed in the upper sedimentation basin 2, the blocking wall 14 and the three flow path walls (the left and right side walls and the downstream side walls constituting the flow path) are formed. In addition, by providing the ceiling wall, the inclined plate device 15 installed in the sedimentation basin 2 in the upper layer can be washed by the same process as the inclined plate device 16 provided in the lower layer.

In the above-mentioned example, the embodiment in which the present invention is applied to the lower layer settling basin 3 of the two-layer type settling device has been described, but the present invention can also be applied to a three-layer type or more multi-layer type settling device.

As described above, in the method for cleaning the inclined plate device according to the present invention, suspended particles remaining in the sedimentation treated water are captured through the inclined plate device arranged below the water surface of the settling pond, and the inclined plate device is used. It is a method of cleaning the inclined plate device used for the sedimentation treatment of collecting the treated water that has passed through the inclined plate device by using the water collecting devices arranged opposite to each other, and the inclined plate is pushed down by pushing down the water level of the settling pond. A first step of exposing the device from water, a second step of cleaning the inclined plate device exposed from water in the first step with cleaning water discharged from a cleaning device arranged opposite to the inclined plate device, and a second step. including.

Further, it is preferable that the water collecting device is used as the cleaning device for discharging the washing water in the second step, and the inclined plate device is washed with the washing water discharged from the water collecting device.

The water collecting device includes a plurality of water collecting pipes in which a plurality of water collecting holes are dispersedly arranged on the peripheral surface, collects treated water that has passed through the inclined plate device through the water collecting holes, and collects the treated water through the water collecting holes. It is preferable that the cleaning water is discharged through the water.

The settling basin is formed in a closed space at least above, and in the first step, a gas is supplied to the closed space, and the pressure of the gas pushes down the water level of the settling basin to expose the inclined plate device from the water. It is a process.

Further, the settling facility according to the present invention has a settling pond in which at least the upper part is formed in a closed space to settle and separate suspended particles in the treated water, and suspended particles arranged below the water surface of the settling pond and remaining in the settling treated water. A tilting plate device for capturing, a water collecting device for collecting treated water that is arranged opposite to the tilting plate device and has passed through the tilting plate device, and supplying gas to the closed space to lower the water level of the sedimentation pond. It is provided with an air supply device for exposing the inclined plate device from water, and a cleaning device for discharging washing water for cleaning the inclined plate device exposed from water by air supply from the air supply device.

The water collecting device is also used as the cleaning device, and includes a plurality of water collecting pipes arranged in an area corresponding to the installation area of the inclined plate device in a plan view and having a plurality of water collecting holes dispersedly arranged on the peripheral surface. It is preferable that the treated water that has passed through the inclined plate device is collected through the water collecting hole and the washing water is discharged through the water collecting hole.

The closed space is preferably formed by the ceiling wall of the settling basin, a blocking wall hanging from the ceiling wall, and a side wall of the settling basin so as to cover at least the inclined plate device, and the closed space. It is preferable to have a degassing tube that draws out the gas supplied to the outside. Further, it is preferable to provide a scum discharge guide wall extending from the ceiling wall on the inflow side of the treated water to the block wall toward the block wall and inclining downward on the downstream side.

The above-described embodiment is an aspect of the present invention, and the description does not limit the present invention, and the specific configuration of each part can be appropriately modified and designed within the range in which the effects of the present invention are exhibited. Needless to say.

1: Sedimentation equipment 2: Upper sedimentation basin 3: Lower sedimentation basin 4: Inflow channel 5: Divergence channel 6: Sludge pit 13, 14: Block wall 15, 16: Inclined plate device 17: Water collecting device (overflow) trough)
18: Water collecting device 18a: Water collecting pipe h: Water collecting hole 20: Water storage tank 21: Scum discharge guide wall 22: Pumping pipe 23: Air supply pipe 24: Washing water pipe V1, V2, V3: Valve F: Fan P3: Pump 100: Organic wastewater treatment equipment

Claims (9)

Suspended particles remaining in the sedimentation treated water were captured through the inclined plate device arranged below the water surface of the settling basin, and passed through the inclined plate device using the water collecting device arranged opposite to the inclined plate device. It is a cleaning method of the inclined plate device used for the precipitation treatment that collects the treated water.
The first step of exposing the inclined plate device from the water by pushing down the water level of the settling basin, and
A second step of cleaning the inclined plate device exposed from water in the first step with cleaning water discharged from a cleaning device arranged opposite to the inclined plate device.
A method of cleaning the inclined plate device including. The cleaning of the inclined plate device according to claim 1, wherein the water collecting device is used as the cleaning device for discharging the cleaning water in the second step, and the inclined plate device is cleaned with the cleaning water discharged from the water collecting device. Method. The water collecting device includes a plurality of water collecting pipes in which a plurality of water collecting holes are dispersedly arranged on the peripheral surface, collects treated water that has passed through the inclined plate device through the water collecting holes, and collects the treated water through the water collecting holes. The method for cleaning an inclined plate device according to claim 2, wherein the cleaning water is discharged through the device. The settling basin is formed in a closed space at least above, and in the first step, a gas is supplied to the closed space, and the pressure of the gas pushes down the water level of the settling basin to expose the inclined plate device from the water. The method for cleaning an inclined plate device according to any one of claims 1 to 3, which is a step. A settling basin, at least above which is formed in a closed space to settle and separate suspended particles in the water to be treated.
An inclined plate device that is placed below the water surface of the sedimentation basin and captures suspended particles remaining in the sedimentation treated water.
A water collecting device that is arranged to face the inclined plate device and collects treated water that has passed through the inclined plate device.
An air supply device that exposes the inclined plate device from water by supplying gas to the closed space and lowering the water level of the settling basin.
A cleaning device that discharges cleaning water that cleans the inclined plate device exposed from water by the air supply from the air supply device, and a cleaning device.
The sedimentation equipment is equipped with. The water collecting device is also used as the cleaning device, and includes a plurality of water collecting pipes arranged in an area corresponding to the installation area of the inclined plate device in a plan view and having a plurality of water collecting holes dispersedly arranged on the peripheral surface. The settling facility according to claim 5, which is configured to collect the treated water that has passed through the inclined plate device through the water collecting hole and discharge the washing water through the water collecting hole. The settling facility according to claim 5 or 6, wherein the closed space is formed by a ceiling wall of the settling basin, a blocking wall hanging from the ceiling wall, and a side wall of the settling basin so as to cover at least the inclined plate device. .. The settling facility according to any one of claims 5 to 7, further comprising a degassing tube for drawing out the gas supplied to the closed space to the outside. 4. Sedimentation equipment.

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