JPS6332486B2 - - Google Patents

Description

Detailed Description of the Invention A. Field of Industrial Application The present invention relates to a liquid filtration device used for turbidity treatment when receiving industrial water from a river, sludge removal treatment when discharging industrial wastewater into a river, etc. Regarding.

B. Prior Art Conventionally, in a liquid filtration device as described above,
When the treated solution to be filtered is simply passed through a sand layer or activated carbon layer, the sludge adheres to the surface of the granular sand or activated carbon, causing the so-called mud ball phenomenon in which the sand or activated carbon binds to each other, causing clogging. It's easy to do. This shortens the period of cleaning due to backflow, and also shortens the period for replacing the filter media, such as sand or activated carbon, which shortens the lifespan of the expensive filter media, making it uneconomical. Additionally, when sludge adhering to the filter media is washed with backflow water, there is a problem that some of the granular filter media may be carried away by the backflow water and flow into the pump, causing damage to the pump's impeller, etc. It was hot. In addition, a method has been proposed in which filter media made of spherical fiber materials are laminated and the treated stock solution is allowed to pass through the filter media layers. are in point contact, large voids are created between the filter media, and these voids communicate with voids between other filter media, so that sludge and the like flow through the communicating voids. Therefore, when using the spherical filter medium, it is necessary to provide a sand layer downstream of the spherical filter medium layer, and further provide a pebble layer to receive the sand layer. However, providing a sand layer or pebble layer in this way increases the filtration resistance in the layer, which requires a large pump pressure, making the pump larger. There are problems in that it is large in size, requires a large installation space, and is expensive.

C. Purpose of the Invention In view of the above, the present invention provides for effective turbidity treatment and sludge removal by simply using small pieces of flat filter material made of fiber material without providing a sand layer or pebble layer as described above. The purpose of this invention is to propose a filtration device that can do the following, and to solve the above-mentioned conventional problems.

D. Structure of the Invention In order to achieve the above-mentioned object, the first invention forms a chamber filled with a filter medium in a filtration tower and a flow path for passing the treated stock solution into the chamber filled with the filter medium, and The filter medium filling chamber is characterized in that the filter medium is filled with a filter medium formed by cutting a flat filter medium made of a fiber material into angular pieces so as to have a filter surface on the entire circumferential surface. , the filling chamber for the filter medium is divided into a plurality of chambers in series, and the porosity of the filter medium filled in the upstream filling chamber is set to be larger than the porosity of the filter medium filled in the downstream filling chamber. This is a characteristic feature.

E. Embodiments Next, embodiments of the present invention shown in the drawings will be described. Reference numeral 1 denotes a filtration tower, in which a first filtering material filling chamber 2 and a second filtering material filling chamber 3 are provided vertically, and above the first filtering material filling chamber 2, there is a diffusion chamber for the treated stock solution. 4, and at the lower part of the second filter medium filling chamber 3, there are provided a discharge chamber 5 for a processing liquid and a processing liquid outlet pipe 5a, respectively. The diffusion chamber 4 is provided with a stock solution introduction pipe 6, and an inner end opening 6a of the stock solution introduction pipe 6 is directed upward in the center of the diffusion chamber 4. The upper part of the diffusion chamber 4 is covered with an opening/closing lid 7, and on the inner surface of the opening/closing lid 7, a number of diffusion ribs 8 for diffusing the introduced treatment stock solution are vertically provided. As shown in FIG. 2, the diffusion rib 8 has an arcuate planar shape and is installed so that its convex side faces the center of the diffusion chamber 4. A plurality of ribs are installed at appropriate intervals on a circumference centered on the center of the chamber 4, and a flow path 9 for the processing stock solution is formed between adjacent diffusion ribs 8, 8. Moreover, the diffusion ribs 8 are located on multiple circumferences centered on the center of the diffusion chamber 4 and are installed as described above, and the adjacent inner and outer diffusion ribs 8 are arranged in a staggered manner. The processing stock solution flows from the inside toward the outside in a meandering manner as shown by the arrow in the figure. The first and second filter medium filling chambers 2 and 3 are each randomly filled with a large number of small, flat, angular filter mediums 10 made of a fiber material. The filter medium 10 is made by cutting a flat filter medium made of synthetic fiber with excellent chemical resistance to a thickness of about 20 mm into square, triangular, or other angular pieces.
A filtration surface is formed on the entire circumferential surface, for example, as shown in FIG. 3. Also, the filter medium 10 filled in the first filter medium filling chamber 2
uses a material whose porosity is larger than that of the filter medium 10 itself that fills the second filter medium filling chamber 3. Further, this porosity is set in accordance with the diameter of sludge etc. mixed into the stock solution. 11 is the filter medium 10
It is a supporting material made of perforated plates stretched above and below the filter media filling chambers 2 and 3 to prevent the fluid from flowing out, and its periphery is fixed to the filter tower 1 by appropriate means such as angle members 12.

F. Effect Now, when the processing stock solution is introduced from the stock solution introduction pipe 6, the processing stock solution flows into the diffusion chamber 4 through the inner end opening 6a.
It is blown upwards inside. At this time, if the diffusion chamber 4 is already filled with the processing stock solution, the processing stock solution is sprayed up into the center of the diffusion rib 8 located at the innermost circumference, and then flows outward through the flow path 9. , hits the diffusion rib 8 on the outer periphery, and further flows outward through the flow passages 9 provided on both sides thereof.

Therefore, the processing stock solution flows in a meandering manner as shown by the arrows in the figure through the diffusion ribs 8 and the flow passages 9, and is diffused to the outer circumferential portion of the diffusion chamber 4 in a turbulent flow. Therefore, the processing stock solution is uniformly diffused over the entire area of the diffusion chamber 4 and then flows downward, passing through the support material 11 and passing through the filter medium 10 of the first filter medium filling chamber 2 . Since this filter medium 10 is a filter medium made by cutting a flat filter medium made of fiber material into square pieces, when these filter mediums 10 are filled, the filter mediums 10 come into contact with each other as shown in FIG. It is extremely rare for voids between filter media to communicate with voids between other filter media. Therefore, the processing stock solution that has flowed as described above mixes into the filter medium 10 from the upper surface and side peripheral surface of the filter medium 10 without passing through the gaps between the filter mediums, and passes through the gaps between the fibers of the filter medium 10. Become. Therefore, the sludge, etc. in the processing stock solution is filter material 10
The filtered liquid is trapped and deposited on the fibers of the filter and flows downward. The water then passes through the supporting material 11 in the lower layer and then through the filtering material 10 in the lower layer to be filtered, becomes clear water, enters the discharge chamber 5, and is discharged from the treatment liquid outlet pipe 5a.
collected or released. When sludge, etc. accumulates on the filter medium 10 due to such filtration work and the filtration resistance reaches a specified value, the introduction of the processing stock solution is stopped, the valve action switches to the backwash system, and the suction of compressed air causes the filter medium 10 to be flushed. After applying vibration to peel off sludge and the like adhering to the filter medium 10, the filter medium 10 is washed by an upward backwash water flow, and the washing water is discharged.

G. Effects of the Invention As described above, according to the present invention, since a filter medium made of a fiber material with a high porosity is used, there is no clogging due to the mud ball phenomenon seen in the conventional sand and activated carbon, and therefore, compared to sand and activated carbon. It has a long service life and is economical because the filter medium can be replaced for a long time, and there is no pump failure due to backflow of sand or activated carbon. Also,
Since the filter medium is formed by cutting a flat filter medium made of fiber material into square pieces, when this filter medium is filled, each filter medium comes into surface contact with each other, and the voids between the filter media are similar to the voids between other filter media. There is extremely little communication, and therefore, compared to the conventional spherical filter media, the amount of unfiltered processing solution that escapes from the gaps between the filter media is extremely small, and there is no need to provide a sand layer or pebble layer as in the past. . Therefore, filtration can be performed using only filter media with high porosity, and the value of the porosity function is low, resulting in low filtration resistance.As a result, a small pump with low pump pressure can be used, and sand and pebble layers can be filtered. Since it is not necessary, the filtration tower can be made smaller, and the installation space and cost can be reduced. Furthermore, since the filter medium is formed by cutting the flat filter medium into small pieces, the entire circumferential surface becomes the contact surface with the processing stock solution, and by filling a large number of these small pieces of filter medium, it is possible to eliminate the need for a conventional stock solution passage section. Compared to a single large sheet-like filter medium that covers the entire area, the contact area with the processing stock solution increases, resulting in higher filtration efficiency. Furthermore, in this invention, the treated stock solution is introduced into the diffusion chamber 4 before passing through the filter medium, and here it is brought into contact with the convex side of the arc-shaped diffusion rib 8 to diffuse the sludge, so that the sludge is spread throughout the diffusion chamber. Since the filter material is evenly diffused throughout the filter material and enters the filter material filling chamber, the filtration efficiency of the filter material can be increased.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a filter tower partially cut away, Fig. 2 is a bottom view of the opening/closing lid showing the diffusion vanes, and Fig. 3 is a perspective view of the filter medium.
FIG. 4 is a perspective view showing a stacked state of filter media. 1...Filtering tower, 2, 3...Filtering material filling chamber, 4...
...Diffusion chamber, 5...Discharge chamber, 6...Introduction tube for treatment stock solution, 10...Filtering material.

Claims (1)

[Claims] 1 In the filtration tower 1, a diffusion chamber 4, a filter material filling chamber, and a discharge chamber 5 are provided sequentially from the top to the bottom, and the diffusion chamber has a stock solution introduction pipe 6 with its open end located in the center and directed upward. In addition, a large number of arc-shaped diffusion ribs are provided on the upper wall of the diffusion chamber extending outward from the center with the convex side facing the center. A liquid filtration device characterized in that the filter medium is cut into square pieces and filled with a filter medium formed to have a filter surface on the entire circumference, and the discharge chamber 5 is further provided with a treated liquid outlet pipe 5a. .