JP2002126409A - Moving bed type upflow filtration equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide moving bed type upflow filtration equipment having an air lift pipe prevent from the local wear at the outer peripheral part adjacent to the tip, uniformly worn with small worn quantity and having long durable years. SOLUTION: In the moving bed type upflow filtration equipment, which has an upflow filtration structure for filtering feed water at the time of passing through a granular filter media (sand) bed and a granular filter media cleaning structure arranged above the upflow filtration structure and for cleaning the soiled granular filter media and is structure to carry the granular filter media into the granular filter media cleaning structure from the lower part of the granular filter media bed of the upflow filtration structure through the air lift pipe, an air dispersion structure 28 for dispersing air introduced into the vicinity of a granular filter media inlet part at the tip of the air lift pipe through an air flow-in pipe 22 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving bed type upward flow filtration apparatus for filtering raw water by flowing raw water upward through a filter material layer of sand or the like used in sewage treatment water equipment and advanced treatment equipment. It is about.

[0002]

2. Description of the Related Art FIG. 1 is a diagram showing the structure of a conventional moving bed type upward flow filter of this type. The moving bed type upward flow filtration device is for cleaning the upward flow sand filtration mechanism 1 which is filtered when the raw water W0 passes upward through the filter sand layer, and the dirty sand disposed above the upward flow sand filtration mechanism 1. A sand washing mechanism 2 is provided. The upward flowing sand filtration mechanism 1 includes a cylindrical tank body 3 in which sand 4 for filtration is stored. In the tank body 3, a distributor 5, a cone baffle 6, an air lift pipe 7, and the like are arranged. It is configured.

The sand washing mechanism 2 has a washing drain box 8, in which a discharge port 9 of an air lift pipe 7 is arranged, and the dirty sand 4 carried by the air lift pipe 7 is provided. The ink is discharged through the discharge port 9. The raw water W0 sent by the pump (not shown) flows from the raw water inflow pipe 10 through the riser pipe 11 to squirt into the distributor 5, and is uniformly dispersed in the lower sand layer of the upward flow sand filter mechanism 1, and the layer of sand 4 Filtered through. Filtration water W1
Is discharged from the filtered water discharge port 13 after flowing over the water collecting trough 12.

The contaminants such as SS are contaminated and the sand 4 is stirred while rising in the air lift pipe 7, the contaminants are separated, and the sand 4 is discharged into the washing and draining box 8 as described above. . The filtered water W1 is introduced into the washing drain box 8 from the filtered water inlet 14, and the sand 4 discharged into the washing drain box 8 is washed by the filtered water W1. Through the gap between the inclined bottom surface and the baffle plate 15 and accumulates in the sand discharge tube 16 provided at the bottom of the washing and draining box 8.

The lower end opening of the sand discharge tube 16 is closed by a float type closing member 17 such as a ball.
When the descending force of the sand 4 accumulated in the inside exceeds the floating force of the float type closure 17, the float type closure 17 sinks and the sand 4 is discharged and returns into the sand layer of the upward flow sand filtration mechanism 1. Sand 4 above
Is discharged from the washing water discharge port 19 after flowing through the flow rate adjusting plate 18. The scum accumulated on the water surface in the washing drain box 8 overflows the scum discharging plate 20, and is discharged together with the washing drain W2. In addition, in FIG. 1, 21 is a raw water air vent.

FIG. 2 is a view showing a partial configuration of the air lift pipe 7. As shown in FIG. As shown in the drawing, the air lift pipe 7 is disposed so as to pass through the inside of the air lift protection pipe 26. The air inflow pipe 2 communicating with the air inflow pipes 22 and 23 of FIG.
2, 23 are arranged. The tip of the air inflow pipe 22 is opened as an intermediate supply port 24 in the air lift protection pipe 26, and the tip of the air inflow pipe 23 is provided as a lower supply port 25 at the top of a cylindrical body 27 provided at the tip of the air lift pipe 7. It is open. By blowing air from the intermediate supply port 24 and the lower supply port 25, dirty sand 4 in the sand layer at the lower part of the upward flow sand filtration mechanism 1 flows in from the tip opening (sand inlet) of the cylindrical body 27, and further, the air lift The air lift pipe 7 rises from the tip opening of the pipe 7 through the inside of the air lift pipe 7.

In the air lift pipe 7 having the above structure, the inside of the cylindrical body 27, that is, the outer peripheral portion near the tip opening of the air lift pipe 7 is connected to the air supplied from the lower supply port 25 and the lower part of the upward flow sand filter mechanism 1. The water in the sand layer is mixed in a turbulent state, and the outer periphery of the air lift pipe 7 is in a state of being sandblasted, so that the outer periphery of the air lift pipe 7 is severely worn. In particular, as shown in FIGS. 3 and 4,
There is a problem that a predetermined portion B of 0 ° to 180 ° near the tip opening of the air lift pipe 7 when viewed from the lower supply port 25 locally increases the wear amount. FIG. 3 is a diagram showing a configuration of a tip portion of the air lift tube 7, and FIG. 4 is a diagram showing a cross section taken along line AA of FIG.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and prevents local wear of an outer peripheral portion in the vicinity of the tip of an air lift tube, uniform wear, a small amount of wear, and a long service life. It is an object of the present invention to provide a moving bed type upward flow filter provided with a long air lift tube.

[0009]

According to the first aspect of the present invention, there is provided an upward-flow filtration mechanism for filtering raw water as it passes upward through a filter material layer, and the upward-flow filtration mechanism. A filter material washing mechanism for washing the contaminated filter material disposed at the upper part of the flow filtration mechanism, wherein the filter material washing mechanism is filtered from the lower part of the filter material layer of the upward flow filtration mechanism by an air lift pipe; An air dispersion mechanism for dispersing air guided by an air inflow pipe in the vicinity of a filter material inlet of an air lift pipe in a moving bed type upward flow filtration device configured to carry and wash granules. It is characterized by.

[0010] As described above, by providing the air dispersion mechanism for dispersing the air guided by the air inflow pipe in the vicinity of the filter material inlet of the air lift tube, the air is uniformly distributed around the outer periphery of the filter material inlet. Since the particles are dispersed and the turbulence of the air and water is reduced, local abrasion of the outer periphery of the air lift tube near the filter material inlet portion is prevented, and the amount of abrasion is reduced.

The invention described in claim 2 is the first invention.
In the transfer type upward flow filtration device according to the above, the air dispersion mechanism is provided at a predetermined interval facing the air supply port at the tip of the air inflow pipe around the outer periphery of the filter material inlet portion of the air lift pipe, the plate material. The plate member is provided with a plurality of air passage ports.

As described above, the air dispersing mechanism is provided with a plate at a predetermined distance from the air supply port on the outer periphery of the air lift tube in the vicinity of the filter material inlet, and a plurality of air passage openings are provided in the plate. With this configuration, with a simple configuration, the air ejected from the air supply port is dispersed through the plurality of air passage ports, and is uniformly dispersed around the periphery of the filter material inlet portion of the air lift tube, Local wear of the airlift tube is prevented and the amount of wear is reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 5 and 6 are views showing a configuration of a tip portion of an air lift tube used in the transfer type upward flow filtration device according to the present invention. FIG. 5 is a cross-sectional view, and FIG. 6 is a cross-sectional view of FIG. It is. The overall configuration of the transfer-type upward-flow filtration device according to the present invention is the same as that shown in FIG. 5 and 6, the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals.

As shown in the figure, an air dispersion mechanism 28 for dispersing the air guided to the outer periphery near the sand inlet at the end of the air lift pipe 7 by the air inflow pipe 22 and ejected from the lower supply port 25 into the cylinder 27 is provided. Is provided. The air dispersion mechanism 28 is provided with a plate member 29 at a predetermined interval on the outer periphery near the sand inlet portion at the tip of the air lift pipe 7 so as to face the lower supply port 25,
A plurality of air passage openings 29a (120 ° in the figure)
(3 at intervals).

As described above, the air lift pipe 7 is provided with a plate member 29 provided with a plurality of air passage ports 29a at predetermined intervals on the outer periphery near the sand inlet of the air lift pipe 7 so as to face the lower supply port 25. By providing the dispersing mechanism 28, the air ejected from the lower supply port 25 into the cylindrical body 27 through the air inflow pipe 22 is dispersed through the plurality of air passage ports 29 a of the plate member 29, and is dispersed below the plate member 29. Is uniformly dispersed and flows into the outer peripheral portion of the air lift pipe 7, so that the turbulence of air and water is reduced, local wear of the outer peripheral portion of the air lift pipe 7 is prevented, and the amount of wear is also reduced. Therefore, the service life of the air lift tube 7 is also increased.

In the above-described example, the air dispersing mechanism 28 provided with the plate member 29 having a plurality of air passing ports 29a at predetermined intervals facing the lower supply port 25 is shown. However, the invention is not limited to this. In short, the air lift pipe 7 in the cylinder 27 passes through the air inflow pipe 22.
Any configuration may be adopted as long as it is a mechanism for uniformly dispersing the air jetted to the outer peripheral portion.

In the above example, the sand 4 is used as a filtering material. However, the filtering material is not limited to sand, but may be a granular material made of a material having an action of filtering raw water. For example, it may be a silica grain or a ceramic grain.

[0018]

As described above, according to the invention described in each claim, the following excellent effects can be obtained.

According to the first aspect of the present invention, an air dispersion mechanism for dispersing the air guided by the air inlet pipe is provided on the outer periphery of the air lift pipe near the filter material inlet portion, so that the filter material inlet is provided. The air is evenly distributed around the part
Since the turbulence of the air and water is alleviated, local abrasion of the air lift pipe near the filter material inlet portion is prevented, the amount of abrasion is reduced, and the service life is extended.

According to the second aspect of the present invention, the air dispersion mechanism is provided with a plate member at a predetermined interval on the outer periphery of the air lift pipe near the filter material inlet portion so as to face the air supply port,
With a configuration in which a plurality of air passage ports are provided in the plate material, air ejected from the air supply port is dispersed through the plurality of air passage ports with a simple configuration, and a filter material inlet portion of an air lift tube is provided. Since it is uniformly dispersed in the vicinity of the outer periphery, local wear of the air lift tube is prevented, and the amount of wear is reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a conventional moving bed type upward flow filtration device.

FIG. 2 is a diagram showing a configuration of a main part of an air lift pipe used in a conventional transfer type upward flow filtration device.

FIG. 3 is a view showing a configuration of a distal end portion of an air lift pipe used in a conventional moving bed type upward flow filtration device.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a view showing a configuration of a distal end portion of an air lift pipe used in the transfer type upward flow filtration device according to the present invention.

FIG. 6 is a sectional view taken along line DD of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upflow sand filtration mechanism 2 Sand washing mechanism 3 Tank body 4 Sand 5 Distributor 6 Corn baffle 7 Air lift pipe 8 Washing drain box 9 Discharge port 10 Raw water inflow pipe 11 Rise pipe 12 Water collecting trough 13 Filtration water discharge port 14 Filtration water Inlet 15 Baffle plate 16 Sand discharge cylinder 17 Float type closing body 18 Flow control plate 19 Washing water discharge port 20 Scum discharge plate 21 Raw water air discharge pipe 22 Air inflow pipe 23 Air inflow pipe 24 Intermediate supply port 25 Lower supply port 26 Air lift Protection tube 27 Cylindrical body 28 Air dispersion mechanism 29 Plate material

Claims (2)

[Claims] 1. An upflow filtration mechanism for filtering raw water as it passes upward through a filter material layer, and a filter particle for cleaning a dirty filter material disposed on an upper portion of the upflow filtration mechanism. Transfer type upflow filtration, comprising a filter material washing mechanism, wherein the filter material is transported from the lower portion of the filter material layer of the upward flow filter mechanism to the filter material washing mechanism by an air lift pipe and washed. The apparatus according to claim 1, further comprising an air dispersion mechanism for dispersing the air guided by the air inflow pipe near the filter material inlet of the air lift pipe. 2. The transfer-type upward-flow filtration device according to claim 1, wherein the air dispersion mechanism is provided at an air supply port at a tip end of the air inflow pipe near an outer periphery of a filter material inlet portion of the air lift pipe. A moving bed type upward flow filtration device, wherein a plate member is provided at a predetermined interval facing each other, and a plurality of air passage ports are provided in the plate member.