JP2595395B2 - Upflow filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upflow filter for use in water, drainage, etc., which can be made compact, simplifies operation and improves filtration efficiency.

[0002]

2. Description of the Related Art A fluidized bed filtration apparatus is, like a fixed bed filtration apparatus, a step of restoring a filtration state after washing a filtration medium after clogging due to a trapped material of the filtration medium and performing a washing of the filtration medium. No special preparation is required. The advantages of this fluidized bed filtration device are that the filtration efficiency is good because the filtration material is constantly filtered on the filtration surface of a new filtration material, and the filtration material filled with traps is transferred to the next step, while the filtration is carried out. On the other hand, it is possible at the same time to wash the filter medium to remove the trapped material.

[0003] However, in order to efficiently carry out the advantages of such a fluidized bed filtration apparatus, it is necessary to make the filter medium contact with the water requiring filtration, and to separate the cleaning wastewater and the purified water promptly. It is an object of improvement to prevent the filter medium from being damaged or deformed due to the flow of the filter medium.

In order to achieve the above object, in a conventional fluidized bed system, an L-shaped pipe is connected to the lowermost end of the bottom of a filtration tower body, and an air-mixing water supply pump is connected to one end of the pipe. The tip is connected to the tank to wash and separate the water and filter media provided at the top of the tower along the outer cylinder of the filtration tower body, and the tube is connected to the tank. Drop it, pour it into the pipe at the tip with a high-pressure mixture water stream sent from one of the pipes, and finally feed it into a tank for separating water and filter media. To the filter media layer. As another method, a double tube is installed from the top to the bottom of the tower inside the tower body, gas (air) is sent from the inner tube, and it is mixed with the filter media and installed at the top of the tower from the outer tube of the double tube. In general, a method of lifting to a separated tank is adopted.

[0005]

One of the structural problems of the former is that when returning the filtered and separated filter medium to the filter medium tank in the tower, the filtered water in the main body of the tower is used for cleaning the filter medium in the filter medium separation tank. There are disadvantages such as part of the wastewater flowing in with the filter medium and not returning uniformly to the filter medium layer.
In addition, in order to obtain a desired filtration effect, it is difficult to set operating conditions, and a filter material transfer pipe can protrude outside the tower, which increases the installation area of the entire apparatus and complicates the treatment process. There were drawbacks. Also, in the latter configuration in which the filter medium is lifted by a double pipe, it is difficult to flow the entire filter medium evenly, the outermost peripheral part of the filter medium may not move, and the filter medium after separation and washing from the separation tank may be used as a tower. There is a drawback such that it is difficult to return the inner pipe to the entire inner circumference uniformly because of the double pipe for the lift.

The disadvantages of the known fluidized bed filtration apparatus described above are improved, that is, the structure is simple, the capacity is large compared to the size of the apparatus, and it is easy to flow the entire filter medium evenly. There is a strong demand for the development of devices with high performance. The present inventors have completed this apparatus as a result of research and development to meet the above demand.

[0007]

That is, the present invention provides: a) a cylindrical filter tube having a truncated right circular cone at the bottom; and b) mixed water into a filter tube provided at the lowermost center of the bottom of the filter tube. C) the filter medium deposition pipe provided at the upper part of the filter cylinder, the weight of the filter medium in the narrow pipe connected to the lower end of the filter medium deposition pipe, and the buoyancy of water in the filter cylinder. A filter material / washing wastewater separator comprising a filter material discharge / holding switching device composed of a buoyant body for discharging or stopping the accumulated filter material; A filter medium rising thin tube which is open and the lower part of which is open to the jet port of the mixed water; e) is provided continuously with the filtration water inlet pipe provided at the lower part of the filter tube, and the fountain hole is provided A ring-shaped filtration water fountain tube surrounding the rising capillary; A) a covering body overlying the water fountain tube; g) mounting of a conical thin tube whose outer diameter is enlarged from the lower outer wall of the lower portion of the filter medium raising tube to a lower portion, and a filter resistance plate; (3) An umbrella for dispersing the filter medium provided at an interval below the apparatus and surrounding the thin tube, and (iii) a flow regulator provided at the top of the tower for adjusting the flow rate of purified water drainage by adjusting the drainage level of purified water. An upward flow filtration device having a configuration comprising a purified water outlet pipe provided with a filter. In the apparatus of the present invention, the filtered sand enters the filter medium deposition pipe together with the water through the filter medium raising thin tube, separates the wastewater, enters the filter cylinder from the filter medium discharge / hold switching device, and descends the filter cylinder. At this time, the filter medium is evenly dispersed by the action of the dispersing umbrella body at the upper part of the cylinder and the filtering resistance plate at the lower part, and further proceeds downward at a substantially uniform speed at all places in the cylinder.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below with reference to the drawings showing a typical example of the apparatus of the present invention. FIG. 1 is a longitudinal sectional view of one embodiment of the apparatus of the present invention, in which a lower end is provided at a lower end of a conical portion formed at a lower portion of a filtration tower at a central portion of a filtration tower main body 1 provided on a base G. Spout 3 installed with the exit pointing into the tower
So as to hold the filter medium suction space 4 just above
Is erected. An upper end of the thin tube is connected to a filter medium discharge / hold switching device 6 connected to a lower portion of the wastewater-filter medium separator 5.
And open into the separator. The filter medium discharge / hold switching device 6 is formed as shown in the enlarged view of FIG. 2, and the inner ring 6 a is sized to be brought into close contact with the outer peripheral surface of the rising thin tube 2. Outer ring 6b
A filter medium deposition pipe 7 is provided at the bottom of the
Further, a buoyancy body 8 is provided below the filter medium deposition pipe. The buoyant body contacts the sedimentation port when there is no sedimentary filter media in the wastewater-filter media separator, or in the case of a small amount, prevents the release of the filter media. A gap is provided between the pipe and the port, through which the deposited filter medium can pass. A ring-shaped fountain pipe 9b provided with a fountain hole 9a connected to the filtered water inlet pipe 9 is provided at the lower part of the tower body, and a cover 10 for preventing the filter medium A from entering the fountain hole is provided. It will be overlaid. At the top of the tower, a wastewater outlet pipe 12 after washing the filter medium is installed on a wastewater conductor 12a connected to the treated water outlet pipe 11 and the separator 5. In the figure, reference numeral 13 denotes a fixture for the rising capillary tube 2 and a filtration resistance plate 14 denotes an umbrella for dispersing the filter medium falling from the holding / discharging switching device 6 of the separator. The latter filter medium is dispersed all around the column, and the filter medium functions to advance downward uniformly in all parts. 15 is a separator 5
The baffle plate provided on the back surface of the top plate is intended to receive a filter medium, mixed water, etc., and to discharge it in the opposite direction (downward). Reference numeral 16 denotes a drainage flow controller for purified water, which balances the amount of water at the outlet of the cleaning wastewater of the filter medium according to the filtration conditions.
The amount of water from the wastewater outlet pipe 12 is adjusted by raising and lowering the position of 6a. Reference numeral 17 denotes an air / water mixture pump. still,
In use, it is necessary that the filter medium is filled to a predetermined level in the filter tower body.

The interval between the inner and outer rings of the filter medium holding / discharging switching device 6 and the size of the filter medium deposition pipe 7 are determined by the size of the filtration tower, that is, the flow speed of the filter medium. The buoyancy is determined by considering the test and empirical factors depending on the type and specific gravity of the filter medium to be used, the amount of the filter medium to be stored in the separator, and the selection of the falling state.

The operation of the apparatus according to the present invention will be described. When the pressurized water sent from the air / water mixture pump 17 is jetted from the jet port 3 into the rising capillary 2, a negative pressure is generated in the filter medium suction space 4. The filter medium is sucked into the rising capillary 2 and rises with the jet water flow. The water stream containing the filter medium hits the baffle plate 15 provided in the wastewater-filter medium separator 5, and falls, the filter medium sinks in the water filled in the separator, reaches the filter medium holding / discharging switching device 6, and the jet water stream is separated. The water is discharged from the wastewater outlet pipe 12 while being mixed with the water in the vessel. Since the buoyant body 8 closes the filter medium deposition pipe, the filter medium is gradually laminated and when a certain weight is reached, the buoyant body moves so as to form a gap between the filter medium and the filter medium, and the filter medium falls from the gap. It falls on the surface of the dispersing umbrella 14, and further falls on the surface of the filter medium layer A1 in the tower, and is widely and uniformly accumulated on the surface. The buoyancy body drops the filter medium, and when the filter medium becomes lighter, closes the original deposition pipe again, and the filter medium that falls falls is deposited thereon. This operation is performed repeatedly. Accordingly, the filter medium is entrained by the jet water from the jet port 3 and reaches the wastewater-filter medium separator 5 through the rising capillary 2, is separated from the water, passes through the filter medium holding / discharging switching device 6, and falls again on the filter medium surface in the tower. The filter medium layer A1 is formed. The filter media layer moves downward.
In this case, generally, the speed of the downward movement of the filter medium is slower near the wall than at the center of the cylinder. In the apparatus of the present invention, the resistance plate 13 is provided below the inside of the cylinder, and its speed is adjusted, so that the filter medium travels almost uniformly downward in all parts. That is, it has a unique configuration of the present apparatus that enables continuous and efficient filtration medium cleaning. After the above-mentioned state is set, water requiring filtration is pumped by the pump P from the filtered water inlet pipe 9. Injection water is jet pipe 9
B is discharged into the filter medium layer A1 from the ejection hole 9a formed in b, flows up between the filtrations, and flows out as purified water from the treated water outlet pipe 11 at the top of the filtration tower. On the other hand, the washing water in the rising capillary in the wastewater-filtration separator was contaminated when raising the filter medium,
It is necessary to prevent this washing water from mixing with the purified water after filtration as much as possible. As a preventive measure, it is preferable that the cleaning wastewater is quickly discharged from the wastewater outlet pipe 12 by adjusting the drainage flow rate of the purified water by the flow controller 16. At this time, if the level of the purified water drainage side is kept high, since the flow rate of the purified water flowing from the filter medium washing wastewater side through the gap of the buoyant body in the filter medium receiving tank follows it, there is also much purified water flowing to the wastewater outlet pipe side. Therefore, the washing wastewater in the separator is also discharged accordingly. However, flowing a large amount of purified water lowers the filtration efficiency. Therefore, it is necessary to adjust the flow rate in advance so that discharge of the purified water is minimized. As described above, the apparatus of the present invention is capable of performing continuous filtration with a small size and excellent efficiency as compared with a conventional apparatus of this type.

[Experimental Example] Using the apparatus of the present invention having a processing capacity of about 5 t / D, using silica sand 0.6 and filter sand 0.6 mm in diameter (equivalent coefficient 1.2) as filter media, and treating the filter media With a surface area diameter of 200 mm and a filter medium filling amount of 20 liters, about 1.5 liter / H of jet water (mixing about 2% of air) was jetted to transfer the filter medium. The filtration water flow was about 260 liter / H. The water quality of the obtained purified water having a ss of 5 μφ or more could be almost removed.

[0012]

As described above, according to the apparatus of the present invention, the advantages of this type of conventional apparatus can be utilized as it is, and the mixing of the filter medium, which has been regarded as a drawback, into the purified water of the cleaning wastewater and the wastewater can be prevented. A buoyancy body floating at the interface with purified water makes it possible to prevent two water layers by blocking it, and a rising tube of filter media is provided in the tower, and jet water is jetted from the bottom. In addition, the size of the filter medium can be reduced and the operation can be facilitated. In addition, the downward movement of the filter medium layer is almost uniform in the entire area, so that effects such as improvement in filtration efficiency can be achieved. The preferred application range of this device is 5 t / D to 5
0 t / D water treatment.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of the device of the present invention.

FIG. 2 is an enlarged view of a filter medium discharge holding switching device of the apparatus of the present invention.

[Description of Signs] 1 Filtration tower main body 2 Ascending capillary 3 Spout port 4 Filter media suction space 5 Wastewater-filter media separator 6 Filter media discharge / hold switching device 7 Filter media stacking tube 8 Floating body 9 Filtration water inlet tube 10 Filtration water inlet Cover of hole 11 Treated water outlet pipe 12 Waste water outlet pipe 13 Filtration resistance plate 14 Filter material dispersion umbrella 15 Baffle plate 16 Flow controller 17 Air-mixed water pump

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-23705 (JP, A) JP-A-55-137012 (JP, A) JP-B-56-37856 (JP, B1) JP-B-48 21551 (JP, B1) JP-B-56-51808 (JP, B1) JP-B-59-20334 (JP, Y1) JP-B1-43125 (JP, Y2)

Claims (1)

(57) [Claims] 1. a) a cylindrical filter tube having a truncated right circular cone at the bottom; b) a spout of mixed water into a filter tube provided at the bottom center of the bottom of the filter tube; c) inside the filter tube Discharging and stopping the discharge of the filter medium by the weight of the filter medium in the filter pipe and the buoyancy of the water in the filter tube, and the weight of the filter medium in the narrow pipe connected to the lower end of the filter medium stack pipe A filter media discharge / holding switching device composed of a buoyant body for separating the filter media and the washing wastewater; d) the upper portion is opened through the separator between the filter media and the washing wastewater, and the lower portion is mixed water. E) a filter medium rising thin tube which is opened at an interval from the jet outlet; e) a filter water inlet tube provided at a lower portion of the filter tube is provided continuously, and a fountain hole is provided to surround the rising thin tube. A ring-shaped filtration water fountain tube, f) a cover provided over the ring-shaped filtration water fountain tube. (G) mounting of a conical thin tube whose outer diameter is increased from the lower outer wall of the filter medium raising thin tube toward the lower part, and a filter resistance plate; A) an umbrella for dispersing the filter medium provided in a surrounding area; and (iii) a purified water outlet pipe provided with a flow regulator provided in the upper part of the tower and adjusting a drainage level of the purified water by adjusting a drainage level of the purified water. An upward flow filtration device having: