JPS58207914A - Lateral flow type filter apparatus - Google Patents

Abstract

PURPOSE:To carry out filtration and washing simulatneously, in a cylindrical filter apparatus, raw water is introduced from the inside to be discharged to the outside while filtered and a filter material is recirculated to be washed. CONSTITUTION:A suspension is supplied from a sprinkler apparatus 2 and passed through moving layers A, B and a fixed layer C to be filtered while treated water is discharged out of a filter tower from a louver 5. The washing of a filter material is carried out such a way that the filter material is sent to an air lift pipe 11 from a main discharge control valve 6 to be violently stirred therein and a suspended substance is separated by a separation tank 13 while the treated filter material is again sent into the filter tower. The main discharge control valve 6 and an auxiliary discharge control valve 7 are controlled in such a manner that the moving speed of the filter material of the moving layer A becomes higher than that of the filter material of the moving layer B.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filtration device, and particularly to a filtration device in which the water flow direction during filtration is a horizontal flow.

In a filtration device, factors that cause suspended solids to be captured within the filter media layer include +11141 mechanical sieving action, (2) surface chemical action, and (3) gravitational sedimentation action. Looking at these capture factors from the water flow direction during filtration, the factors (1) and (2) above are dominant in the downward flow filtration method and the upward flow filtration method, and the 131 gravity sedimentation effect is not effective. It is believed that it is not moving. Therefore, downward flow filtration method 2
Since the filtration performance of the downflow and downward flow filtration methods is inferior in terms of removing suspended matter, the filtration rate must be reduced in order to obtain sufficiently clear treated water, and therefore a large number of liquid processing methods are required. In order to carry out the treatment, the body and beak of the filter medium layer must be made larger, which poses the problem of increasing the size of the apparatus.

Therefore, in order to effectively utilize the trapping factors (1) to (3) above, a so-called lateral counterflow filtration method has been proposed, in which lateral flow passes through a vertical filtration layer during filtration. .

However, although such a cross-flow filtration system is excellent in terms of filtration performance, it has the following problems in terms of backwashing. In other words, even in the horizontal flow filtration method, the backwash method requires that filtration is stopped when the quality of the treated water deteriorates due to continued filtration, and the head loss of the filter media layer increases to reach the allowable value. It has been proposed to apply a batch method in which this is carried out, and a continuous method in which the filter medium layer is washed in small amounts in succession at the same time during filtration.

In the case of the former batch method, the backwash water is passed from the bottom of the filter layer in an upward flow in the opposite direction to the gravity direction, fluidizing the filter layer and being captured by the filter layer, causing it to be separated. . This blank piece, the entire filter medium layer f: If it is not fluidized, the filter medium cannot be washed effectively.

Conventionally, in the case of lateral flow filtration, a perforated plate or a perforated W, etc. are used as a device 2 for sprinkling raw water onto a filter medium layer during filtration, and a temporary storage device 1 for storing clear treated water that has passed through the filter medium layer. It is used. However, when backwashing a porous plate or the like in a porous pipe, the backwash water or the porous plate flows through the inside of the porous mortar in a short circuit, causing the filter layer to expand and prevent backwashing. For this reason, if the pore diameter of a perforated plate or perforated pipe is made small, for example 0.4 W or less, in order to prevent the short-circuit flow of backwash water, it is necessary to form an extremely large number of pores in terms of head loss. , VC requires a lot of effort in manufacturing the device. .

On the other hand, the continuous method has a structure in which the filter medium layer is moved in the direction of gravity, the filter medium is continuously extracted from the bottom of the filter medium layer, the filter medium is washed by an air lift, etc., and the washed filter medium is again supplied to the top of the filter medium layer. In this continuous system, there is no need to consider the short-circuit flow of backwash water, so the device structure is simplified.

In the case of the rough batch method, a large amount of backwash water is required for a short period of time, and at the same time the entire length of backwash wastewater is discharged, so it is necessary to install a backwash water tank and a backwash wastewater tank to store this water. However, in the case of a continuous system, the storage tank is insecure, so there is an advantage in that construction costs can be reduced.

However, in conventional continuous systems, filter media! - Because all of the steps are moved continuously, there is a drawback that the turbidity is not sufficiently captured even though it is 2 to 3 times as much as the main thorough washing method.

The purpose of the present invention is to eliminate the drawbacks of the prior art, to improve the quality of the treated water, to reduce the amount of washing water, and to reduce the amount of waste water used.
We aim to provide a filtration device with a simple horizontal counterflow continuous filtration system.

The present invention has a filtration device FC& that allows raw water to pass through a filter layer as jets and countercurrents at the time of filtration, and has a moving layer section that moves the filter material in the direction of gravity on the raw water sprinkling side, and this moving layer. In both parts, a fixed layer of the filter medium is installed on the outside away from the raw water sprinkling side through the moving layer and the porous plate, and when washing the filter medium, the moving layer is continuously washed during filtration, and the fixed layer is fixed at 7 m. The filter is moved in the direction of gravity when filtration is stopped, and is washed intermittently.

The F1 mountain lantern is fully attached to the -C illuminating embodiment.

In this filtration device, the middle dog part ρ is formed into a cylindrical shape, and the upper part is formed into a round koji shape and an inverted circular haze shape, respectively.
It consists of a 4-hour filter tower 1, and the central field of this filter tower 1 is
Along this line, a water sprinkling device 2 consisting of a cylindrical louver with a closed tip is provided. A cylindrical partition plate 3 is provided at a predetermined interval from this watering device 2, and this partition plate 3
Cylindrical partition plates 4 are provided at a predetermined interval t%. These partition plates 3.4 have a particle diameter of about 3 to
A large number of holes are provided. Additionally, a cylindrical louver 5 is provided at a predetermined distance from the partition plate 4. The required length of the louver 5 is selected by considering the angle of repose of the filter medium. In this way, the inner cylindrical spaces A, B, C, and D extend from the core to the outer periphery.
Vc sectioned.

A main discharge control box 6 is installed at the lower end of the filter 1, and a secondary output control box 7 is installed at the bottom of the partition &3.

li! Partition plate 3KI' with an annular plate in II concurrent control box 7! :
The filter is configured to move vertically and fit between the lower part of the annular plate and the inner surface of the cone of the filtration filter. At the bottom of the tower forming the dark city, there are a plurality of discharge pipes 8 and a discharge valve 9 interposed in the middle of these drain pipes 8. .

Ejection-I! 8 is a discharge pipe 10 connected to the main discharge control box 6
and Airlift II1 i. An air blowing pipe I2 is connected to the air lift pipe It, and the air blowing pipe I2 is connected to the separation tank section 13 provided at the upper part of the filtration tower 1. .

The space A% 8% Cvcm material of such a filtration device is filled, and the spaces A and E each include a moving layer A1B1 a space C#'i: a fixed layer. Then, the raw water containing suspended solids is sprayed radially from the water sprinkling device 2 onto the filter layer in a horizontal direction, and the suspended solids are removed during the process of passing through the moving layers A, B and fixed layer C, and the treated water is sent to the louver 5. It is collected through a water intake device consisting of a space, and is discharged to the outside of the filtration tower. Most of the suspended solids in the raw water are removed in moving layer parts A and E (relatively large suspended solids), and then relatively small suspended solids are captured in solid bed layer C. Since it is removed in the finishing treatment, the turbidity concentration in the treated water is only a temporary amount of movement 1.
Against this, it deepens to 1 clear after 21.r. Moving layer parts A, B
If you look at the turbidity capture TVR along the water flow direction, the closer you are to the sprinkler, the more 1 t. Sunawa i==# The amount of suspended solids trapped in the moving layer section A is larger than that in the moving layer section B.

By operating the main discharge control valve 6 and the sub-discharge control @I box 7, the entire tic of the #I layer is removed.
The moving speed of the filter medium in the moving layer A is controlled so that the moving speed of the filter medium in the moving layer A is also greater than the moving speed of the filter medium in the moving layer B. 7t2 is the mobile layer AXBl
Since the moving speed can be controlled according to the amount of suspended solids captured in the /tub, the amount of waste water consumed for cleaning can be minimized.

Here, in the moving layer part, a phenomenon occurs in which the suspended solids that have been filtered once are separated by 5+ during the movement of the filter medium, and this separated suspended solid is gradually transferred to the V-shaped medicinal tree side by the jet stream and captured by the fixed tube. A relatively large amount of suspended matter is captured at the interface between the moving layer and the fixed layer. Therefore, the pore size of the partition plate ↓ is 3~1O of the filter medium particle size.
7t,; 4 times, the interface between the JJ layer and the fixed layer is due to the supply of filter media vcrx, so the interface should not be regenerated close to the fixed one. The pore size of the partition plate 3 should be set to 3 to 10 times the diameter of the filter media particles, since even if there is a slight penetration force of the filter media particles during the interval Vζ, it will not have a major effect on the filtration performance.
It's enough to double that. In this way, since the hole diameter of the partition plate 3.4 can be made relatively large, the increase in pressure loss ΔP can be minimized.

Next, the cleaning of the filter medium will be explained. First, the filter medium in the moving bed section A is cleaned (the filter medium that has passed through the main discharge control valve 6 is vigorously stirred in the air lift tube 11, so the suspended matter adhering to the filter medium is completely peeled off and then separated). Tank [3
Here, the suspended solids and the filter medium are separated based on the difference in specific gravity and particle size, and the filter medium is sent into the filtration tower again. The suspended solids are discharged through an overflow pipe 14 provided at the upper part of the separation tank 13. After passing through the sub-discharge control box 7, the filter medium of the moving layer B is transferred to the main discharge control box @1.
After passing through fP6, suspended solids adhering to the filter medium are separated in the same manner as described above, and the filter medium is sent to the filter tower 1 again.

In this way, the moving layer portion A1B is simultaneously washed during filtration. In this case, the water sprinkling during filtration is in the zone shown by E in Figure 1 (the angle of inclination is 7 based on the angle of repose of the filter medium;!:).
Regarding cleaning of fixed 1n6G filter media that does not flow back into the separation tank 13 due to ..., the cleaning frequency depends on the turbidity concentration of the raw water,
Allowable turbidity of treated water @ determined as appropriate depending on the barrel. When cleaning the fixed bed, supplying raw water 1. Collection of treated water, moving layer part A,
The movement of the filter medium B is stopped, the discharge valve 9 for the filter medium of the fixed bed C is opened, and the filter medium of the fixed bed C is supplied to the air lift pipe 11 having eight drain pipes. The filter material, which has been washed in the same way as the filter material of the moving bed AXB and from which suspended solids have been removed, is introduced into the filter tower 1.

At this time, since the moving bed A, B>c is filled with the filter M, the filter material of the filtration tower trc enters the space C and forms the beating bed C. Although the moving layer section is divided into 2rtl sections through a perforated plate, it is also possible to make the moving layer section three or more layers and reduce the moving speed of the filter material as it moves away from the water tank M@. There may be only one layer. Also, instead of a sprinkler system consisting of cylindrical louvers, a pipe with many holes or corrugated pipes can be used.
It is said that the louver is used for the T-irumizu'ryobi sword, but there are many holes or slits).
Hollowed partition plates can also be used. Furthermore, if you use a filter with a large number of holes or slits in the sprinkler system, the filter material may seep into the sprinkler system. , v
A discharge valve for discharging I may be provided.As described above, according to the present invention, the moving bed section can be washed at the same time as filtration, and there is no need to fluidize the filter medium layer. It is possible to make it simple and only need to intermittently wash a part of the filter medium layer (solid e; 1 t) f1, so it is possible to filter efficiently while reducing the amount of washing waste water. can be processed.

[Brief explanation of the drawing]

Fig. 1 shows a side configuration of one row of the present invention.
The figure is a sectional view taken along the knee line L in Figure 1. l...Filtering tower, 2... Water sprinkler, 3.
4... Partition plate, 5... Louver 61. , Ball discharge ffi control box, 7... Sub-discharge control - box, d, l
+], -...Discharge blind, 9...Discharge valve. 1. Air lift inspection, 12. Ministry of labor, 13. Separation tank. Agent Nobu Numa Kinno 1 (1 idiot 2 people)

Claims (3)

[Claims] (1) In a filtration device in which the water flow direction of raw water during filtration is made into a horizontal flow and passes through a filter media layer, a moving layer section that moves the filter media in the direction of gravity is provided on the raw water sprinkling side, and a moving layer section is provided on the raw water sprinkling side from the raw water sprinkling side than this moving layer section. A horizontal counterflow type filtration device characterized in that a filter medium fixed layer is provided on a separate outer side through the moving layer portion and a porous plate, and the outer side of the fixed layer is set as a water collection side. (2) Claim (1) characterized in that the moving layer consists of two or more layers, and the moving speed of the filter medium in each of these moving layers is decreased from the raw water sprinkling side to the filter medium fixed layer side. The horizontal counterflow type filtration device described in Section 1. (3) The filter medium in the moving bed is configured to be introduced into the upper part of the filter tower through a lift pipe after being extracted from the filter tower. 1) The horizontal counterflow type filtration device described in item 1).