JPH0425203Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is designed to prevent scum from being mixed into the supernatant water in batch treatment tanks where scum is formed on the water surface, or to reduce the amount of scum that is mixed into the supernatant water. The present invention relates to a supernatant water discharge device having a function of discharging supernatant water and effectively discharging scum.

[Conventional technology]

In batch treatment tanks such as activated sludge treatment tanks,
When the supernatant water is discharged, scum generated on the water surface is prevented from mixing with the supernatant water and being discharged.

Conventionally, the water collection area that collects supernatant water was surrounded by a baffle plate to prevent scum from getting mixed into the supernatant water, but in order to more effectively prevent scum from getting mixed in, A separate scum removal device was provided.

For example, the operating water level of a batch treatment tank is set at a fixed level, and the scum discharge port is installed at a position slightly lower than that water level, and the scum discharge port is automatically installed at the exit side of the scum discharge port to prevent the water in the tank from flowing out during treatment processes such as aeration. A valve was installed, and the scum was discharged by automatically opening the valve when necessary.

[The problem that the idea aims to solve]

However, in conventional scum removal devices, the scum discharge port is fixed, so if the amount of inflow water is less than the designed value, the operating water level will be lower than the scum discharge port, making it impossible to discharge the scum. On the other hand, when the amount of inflow water increases, a large amount of tank water also flows out when the scum is discharged, making it impossible to effectively discharge the scum.

In addition, since the water level of the supernatant water in the batch treatment tank decreases as the supernatant water is discharged, it was necessary to gradually lower the supernatant water outlet, but this is related to the elevation of the scum outlet. There was nothing left.

The present invention rationally combines the supernatant water discharging mechanism and scum discharging mechanism of a batch treatment tank, and allows the discharge amount of scum and supernatant water to be adjusted arbitrarily using one elevating drive mechanism. The object of the present invention is to provide a device that enables accurate discharge of scum and also enables simultaneous discharge of scum while discharging supernatant water.

[Means to solve the problem]

This invention has a supernatant water discharge gutter that can be raised and lowered in the tank, and a scum discharge port that moves up and down in conjunction with the elevation of the supernatant water discharge gutter while maintaining a position below the top of the supernatant water discharge gutter. The supernatant water discharging device is characterized in that the scum discharging port is provided with a stopper for stopping the descending of the scum at a predetermined position by cutting off the connection with the supernatant water discharging device.

In addition, the present invention provides a supernatant water discharge gutter surrounded by a buff-full plate in the tank so that it can be raised and lowered, and the supernatant water discharge gutter is moved up and down while maintaining the position near the top of the supernatant water discharge gutter. This supernatant water discharging device is characterized in that it is provided with a scum discharging port that moves up and down, and that the scum discharging port is provided with a stopper that stops the descending of the scum discharging port by cutting off the linkage with the supernatant water discharging device at a predetermined position.

[Effect]

In the present invention with the above configuration, when discharging supernatant water after the completion of processing in the batch treatment tank, the supernatant water discharge gutter is lowered, but at the same time, the scum discharge port located below the supernatant water discharge gutter is also lowered, and in the initial stage. The scum on the water surface is discharged from the scum outlet, and the supernatant water is subsequently discharged from the supernatant water discharge trough.

At this time, the amount of scum and supernatant water discharged can be adjusted by changing the speed at which the supernatant water discharge gutter descends. Further, the lowering of the scum discharge port is stopped by cutting off the connection with the supernatant water discharge gutter by a stopper after the scum discharge is completed at a predetermined position below the scum layer. However, by continuing to lower the supernatant water discharge gutter, the supernatant water is continuously discharged.
After discharging the supernatant water at the lower limit position, the supernatant water discharge gutter is raised, and when it passes the stop position of the scum discharge port, it returns to the top position with the scum discharge port, and the next water to be treated flows into the tank. Inflow and processing takes place.

Furthermore, if the supernatant water discharge gutter is surrounded by a baffle plate, and the scum discharge port is moved up and down while being positioned near the top of the supernatant water discharge gutter, by lowering the supernatant water discharge gutter, At the same time as the scum is collected at the scum discharge port and discharged, supernatant water can be discharged while blocking the inflow of scum by the baffle plate.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a supernatant water discharge gutter provided in a tank, and a surrounding buttful plate 2 is connected to it, and the buttful plate 2 is connected to a base above the tank. It is connected to an elevating spindle 5 that is raised and lowered by a drive machine 4 fixed to the base 3, and the lifting and lowering is carried out by a connecting rod 6 connected to the baffle plate 2 guided by a guide pipe 7 vertically installed on the base 3. be exposed. A flexible supernatant water discharge hose 8 for discharging the collected supernatant water out of the tank is connected to the supernatant water discharge gutter 1, and it is preferable that the supernatant water discharge hose 8 has a spiral shape and can be expanded and contracted.

Reference numeral 9 denotes a scum discharge port provided in the tank, to which a flexible scum discharge hose 10 for discharging collected scum to the outside of the tank is connected, and is supported by a support member 11 that can be raised and lowered. is located above the connecting rod 6 of the full plate 2,
A connecting rod 12 that moves up and down while being guided by the same guide pipe 7 is connected. Therefore, when the supernatant water discharge gutter 1 rises, the connecting rod 12 is raised by the connecting rod 6, so the scum discharge port 9 also rises, and when the supernatant water discharge gutter 1 descends, the scum discharge port 9 is lifted by its own weight. It will then descend. Further, a stopper 13 is attached to the support member 11 of the scum discharge port 9, so that the downward movement of the scum discharge port 9 due to its own weight is stopped at a predetermined position, that is, at the bottom of the scum layer. A wire that can be adjusted to a predetermined length may be used as the support material 11 for the scum outlet.

In addition, regardless of the presence or absence of the full plate 2, the positional relationship when the supernatant water discharge gutter 1 and the scum discharge port 9 go up and down at the same time is that when the supernatant water is discharged after discharging scum, the scum discharge port 9 If the scum and supernatant water are to be discharged at the same time, a double plate 2 is provided so that the scum discharge port 9 is kept at a position below the top of the supernatant water discharge gutter 1. It is necessary to maintain the position near the edge.

Therefore, when the supernatant water is to be discharged after the completion of processing in the batch treatment tank, when the elevating spindle 5 is lowered by the driver 4, the scum discharge port 9 is lowered by its own weight, and the scum discharge port 9 is first lowered by its own weight. reaches the water surface, the scum on the water surface is discharged, and the scum discharge port 9 descends in accordance with the lowering of the water surface due to the scum discharge.

At the position where the scum discharge port 9 reaches the lower part of the scum layer and the scum discharge ends, the downward movement of the scum discharge port 9 is stopped by a stopper 13, and thereafter the supernatant water discharge gutter 1 further descends, and only the supernatant water is discharged.

Note that the amount of scum discharged and the amount of supernatant water discharged can be adjusted by changing the speed of the drive machine 4.

Furthermore, when the position of the scum discharge port 9 during lifting and lowering is kept near the top of the supernatant water discharge gutter 1 surrounded by the buff-full plate 2, when the scum is discharged, the buff-full plate 2 accurately prevents the inflow of scum. Supernatant water can be discharged at the same time while preventing In this case, when the supernatant water is discharged, a small amount of scum may be mixed in, but the amount is so small that it hardly affects the water quality.

[Effect of idea]

As described above, according to the present invention, the supernatant water discharge gutter and the scum discharge port are raised and lowered by one elevating drive mechanism, and the scum is discharged in the initial stage of discharge, and then the supernatant water is discharged. It is possible to minimize the amount of supernatant water that is accompanied by the scum that is produced, to prevent scum from being mixed into the supernatant water that is discharged, and to easily adjust the amount of scum and supernatant water that is discharged.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view of the main part, and FIG. 2 is a sectional view taken along the line -- in FIG. 1... Supernatant water discharge gutter, 2... Buffful plate, 3... Base, 4... Drive machine, 5... Lifting spindle, 6... Connection rod, 7... Guide pipe, 8... Supernatant water discharge Hose, 9...Scum discharge port, 10...Scum discharge hose, 11...Support material, 12...Connection rod, 13...Stopper.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A supernatant water discharge gutter is provided in the tank so that it can be raised and lowered, and the supernatant water discharge gutter is moved up and down while maintaining a position below the top of the supernatant water discharge gutter. A supernatant water discharge device characterized in that a scum discharge port that moves up and down is provided, and a stopper is provided on the scum discharge port to stop the descending of the scum by cutting off the linkage with the supernatant water discharging device at a predetermined position. (2) A supernatant water discharge gutter surrounded by a buttful plate is installed in the tank so that it can be raised and lowered, and the supernatant water discharge gutter is moved up and down in conjunction with the elevation of the supernatant water discharge gutter while maintaining a position near the top of the supernatant water discharge gutter. Equipped with a scum outlet,
A supernatant water discharging device characterized in that the scum discharging port is provided with a stopper for stopping the descending of the scum at a predetermined position by cutting off the connection with the supernatant water discharging device.