JPH0866604A - Upflow fluidized bed filter - Google Patents

Abstract

PURPOSE: To normally form a filter bed in which compactness necessary for filtration is maintained by installing compacting pipes, a filter medium feeding conveyor, and a baffle plate and a filter medium withdrawal conveyor in the upper part of a tank body, in the central place where the conveyor is embedded in the filter medium, and in the lower part respectively. CONSTITUTION: A tank body 1 packed with a filter medium is provided with a raw water inflow pipe 2 having a baffle plate 3. In the upper part of the tank body 1, plural compacting pipes 10 having a fixed inclination are installed to maintain the compactness of the filter medium for increasing the filtration accuracy. And below the pipes 10, a filter medium feeding conveyor 9 is installed in a place where it is embedded in the filter medium. In the lower part of the tank body 1, a baffle plate 4 is installed to reduce the variation in the compactness of the filter medium associated with the movement of the filter medium. And in the utmost lower part, a filter medium withdrawal conveyor 5 is installed. In such a way, since after the filter medium is surely and continuously transferred by a fixed quantity and is washed with pressure water from a washing nozzle in a washing tank 6, it is fed to the tank body 1 again, the filter bed is normally maintained in a stable state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtering device for clarifying suspended water such as industrial wastewater and river water, and more particularly to an upflow moving bed type filtering device for simultaneously performing continuous filtration and washing. is there.

[Prior Art] Generally, a batch operation of filtration-backwashing is used for filtration of suspension water, but a large amount of backwashing water is required at a time, and a large amount of washing wastewater is discharged at the same time, so equipment space is required. Since it is large and uneconomical, an upflow moving bed type filtration device has been proposed in which an air lift pipe is used for moving the filter medium and filtration and washing can be continuously performed at the same time.

As shown in FIG. 3, in a conventional upward-flow moving bed filter, a raw water inflow pipe is installed in the lower part of the tank body, and an air lift pipe (11) for extracting the filter medium is installed in the central part. A cleaning unit is installed on the upper part of the tank body to clean the filter media by the level difference between the treated water surface and the cleaning drainage surface, and supply the filter media to the filtration layer by the drop.

[Problems to be Solved by the Invention] However, according to the conventional upward flow moving bed type filtration device, the filter medium is collected at a position constricted on the cone below the tank body and transferred by the air lift pipe (11). Therefore, it is possible to extract only the amount of filter medium determined by the cross-sectional area of the air lift pipe, or it may occur that blocks are apt to be extracted at all, and the stability of the filtration layer is lacked by the operation to eliminate this, Accidents that lead to poor filtration, and the cleaning of the filter media cannot be carried out sufficiently and reliably, such as by passing water through the level difference of the treated water surface. There was a problem. Then, the subject of this invention is providing the upflow moving bed type filtration apparatus which secures the filtration layer which keeps stable pressure density which is essential in upflow filtration.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the upward flow moving bed type filtration device of the present invention has a plurality of consolidation pipes arranged at an upper part of the tank body with a certain gradient. The filter medium supply conveyor is installed at a position to be embedded in the center filter medium, and a baffle plate is installed on the side of the tank body to prevent short paths due to the wall effect of filtration. Install a baffle plate with a sloped surface, install a filter material extraction conveyor near the bottom surface, set up a filter material transfer conveyor, and connect it to the cleaning tank installed close to the tank body for cleaning. A filter material supply conveyer that connects the lower part of the tank and the tank body is installed, a filter material cleaning nozzle is installed in the lower part of the cleaning tank, a pump for sending treated water is installed in the upper part of the tank body, and a pipe is connected to the cleaning nozzle. Constructed by.

[Operation] According to the upward moving bed filter of the present invention, the filter material can be reliably and continuously moved by the extraction conveyor, the transfer conveyor and the supply conveyor in a fixed amount, and the filter material is washed with pressurized water. Since it is performed by the cleaning nozzle, it can be performed reliably and efficiently. For this reason, the filtration layer can always be kept in a stable state and a uniform filtration layer can be maintained by the consolidation pipe and the baffle plate. With a structure that takes into account the transfer by conveyor and compaction, it is possible to change the movement amount of the filter medium while keeping the filtration layer stable.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1 and FIG. 2, in the upward flow moving bed type filtration device of this embodiment, the tank body is formed in a square shape with a lower semi-circular shape,
The upper part has a lid plate, and the treated water outlet pipe (12) is erected. A raw water inflow pipe is fixedly installed at the bottom of the tank body.

On the upper part of the tank body, six compaction pipes (10) are installed in parallel above the filter medium supply conveyor with a gradient in the horizontal and vertical direction from the center. In addition, a baffle plate that spreads downward is fixed to the lower part of the tank body in the vertical direction, and a filter medium pulling conveyor is fixedly installed under the baffle plate. A filter material transfer conveyor, which is juxtaposed to the side surface of the tank body and is connected to the filter material extraction conveyor at a right angle, is connected to the filter material cleaning tank at the top. A filter material cleaning nozzle (13) is fixedly installed in the filter material cleaning tank, and it is connected to a cleaning pump installed in the upper part of the tank body. A filter medium supply conveyor, which penetrates through and is connected to the filter medium cleaning tank and the upper part of the tank body, is fixedly installed. It is installed below the consolidation pipe (10) at the position where it is embedded in the filter medium supply part [2] filter medium at the upper part of the tank body. There is.
The filter medium supply holes are appropriately arranged on the side surface of the filter medium supply conveyor to uniformly supply the filter medium.

In the upward flow moving bed type filtration device of this embodiment constructed as described above, the suspension water pressure-fed from the raw water inflow pipe is subjected to upward flow filtration in the filtration layer [3]. At this time, the consolidation pipe (10) can reduce the phenomenon that the filtration layer swells due to the pressure generated by the upward flow. The filtered treated water is stored in [1] and collected from the treated water outlet pipe (12). Further, a part of the treated water is used for cleaning the filter medium by a filter medium cleaning pump. The cleaning waste water is discharged from a nozzle provided on the side surface of the filter material cleaning tank.

On the other hand, the transfer of the filter medium which has collected the suspension is supplied by the filter medium supply conveyor above the tank body. Due to the pressure of the washed filter medium, the filter medium is stably extracted by the filter medium extracting conveyor through the baffle plate. Further, it is sent to the filter material cleaning tank by the filter material transfer conveyor, and is efficiently cleaned with the treated water in the filter material cleaning tank. Since the filter medium regenerated by cleaning is pressure-fed from the lower part of the filter medium cleaning tank to the filter medium supply section [2], a uniform filtration layer [3] can be formed. Further, since the cleaning drain outlet nozzle provided in the filter material cleaning tank is lower than the treated water outlet pipe, the cleaning drain does not mix with the treated water [1]. Therefore, the filter medium is pulled out, washed,
The feed can be moved quantitatively without compromising filtration performance. Further, by using a conveyor for moving the filter medium, it is easy to adjust the moving amount of the filter medium according to the increase or decrease in the concentration of suspended solids in the suspended water or the amount of suspended water.

The present invention is not limited to the above-described embodiment, and for example, the bottom portion of the tank main body has a conical shape, the consolidation pipe (10) has an angular shape, and there are a plurality of pipes. The shapes and configurations of the respective parts may be appropriately modified and embodied without departing from the spirit of the invention.

[Effect of the Invention] As described in detail above, according to the present invention, the movement of the filter medium is performed by the conveyor,
Since the effective arrangement of compaction pipes and baffles was invented,
It has an excellent effect that a filtration layer maintaining a pressure density necessary for stable filtration can be constantly formed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an upflow moving bed type filtration device showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of an upflow moving bed type filtration device showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional upflow moving bed type filtration device.

[Explanation of symbols] ... Tank ... Raw water inlet pipe ...
Raw water Baffle plate ... Baffle plate ... Filter material extraction conveyor ...
Filter media cleaning tank ... Filter media transfer conveyor ... Filter media cleaning pond. …
Filter material supply pump ▲ 10 ▼… Consolidation pipe ▲ 11 ▼… Air lift pipe
▲ 12 ▼… Treatment water outlet pipe ▲ 13 ▼… Filter material cleaning nozzle

Claims (1)

[Claims] 1. A tank main body filled with a filter medium is provided with a raw water inflow pipe with a baffle plate, and a consolidation pipe (10) for maintaining the pressure density of the filter medium is installed in order to improve the filtration accuracy. A baffle plate to reduce fluctuations in the pressure density of scale material is installed at the bottom, a filter medium extraction conveyor is installed to extract the filter material, and a filter material transfer conveyor is installed to transfer the extracted filter material to the filter material cleaning tank at the top. An upflow moving bed type filtration device characterized in that a cleaning pump is connected to the tank body, and a filter material supply conveyor that supplies the filter material to the upper part of the tank body from the cleaning tank equipped with a cleaning nozzle is provided.