KR101352678B1 - Fiber discfilter filtering apparatus with suction washing device having enhanced washing efficientcy - Google Patents

Abstract

The purpose of the present invention is to enhance washing efficiency by effectively removing foreign materials remaining between fabric filters which are not easily removed by a conventional suction washing method, and to prevent damage to the fabric filters. To achieve the purpose, a suction washing device of a fiber disk filter according to the present invention is a device for sucking and washing foreign materials attached to the fabric filters of the fiber disk filter, comprising a suction part attached to the surface of the fiber disk filter to provide suction for sucking foreign materials; and a suction slit arranged on the side where the suction part is attached to the surface of the fiber disk filter, and forming a channel for sucking the foreign materials. Part of a surface surrounding the suction slit has a wall surface formed concavely in a direction of receding from the surface of the fiber disk filter. And during suction washing, the fabric filters are detached when the fabric filters reach the concave wall surface, and are made flat when the fabric filters reach the suction slit. [Reference numerals] (AA) Suction part; (BB) Foreign materials; (CC) Suction slit; (DD) Suction direction; (EE) Pile; (FF) Filtration direction; (GG) Fabric filter; (HH) Pile being laid; (II) Pile spreading slowly; (JJ) No foreign material between the pile; (KK) Moving direction of the fabric filter

Description

FIBER DISCFILTER FILTERING APPARATUS WITH SUCTION WASHING DEVICE HAVING ENHANCED WASHING EFFICIENTCY}

The present invention relates to a fiber disk filter filtration apparatus for use in a water treatment apparatus for filtering sewage, purified water, sewage, wastewater, process water and the like.

In recent years, as the discharged water quality standards of water treatment facilities are gradually strengthened, improvement of treatment efficiency is also required in filtration facilities such as fiber disk filters and the like as tertiary treatment facilities. Fiber disk filter using a fiber filter cloth having a large number of fleece on the surface has emerged as a total treatment facility has been developed a variety of applications such as immersion model. As the performance of the fiber disk filter is increased in the final discharge water quality, the cleaning equipment used for the cleaning of the fiber disk filter is required.

1 is a perspective view showing an example of a conventional fiber disk filter filtration apparatus.

Referring to FIG. 1, the filtration device 1 comprises a cylindrical rotating drum 2 rotating around a central axis and a disk filter segment 3 radially mounted along the outer periphery of the rotating drum 2. do. The disk filter segments 3 are mounted in multiple layers in the axial direction of the rotating drum 2. The filtration device 1 is provided so that some or all of the filtration device 1 is immersed in a water channel or a water tank for filtering raw water. The raw water passes through this filtration device 1 while flowing along a water channel or a water tank, wherein foreign matter contained in the raw water is filtered by the fiber filter cloth 4 provided in each segment 2 and remains on the outer surface. Then, the treated water filtered through the fiber filter cloth (4) is configured to be collected into the rotary drum (1) through the inlet (5) and discharged to the water collecting device.

In this way, foreign matter contained in the raw water is caught on the surface of the fiber filter cloth 4 and remains, so if not removed, the voids of the fiber filter cloth 4 are blocked, and the filtration efficiency is lowered. In the case of using a coagulation filtration method in which foreign substances in raw water are aggregated by a chemical (coagulant) and filtered, the aggregated foreign matters easily occlude pores of the fiber filter cloth 4, and thus there is a problem in that the filtration efficiency is further lowered. Therefore, it is necessary to wash the foreign matter adsorbed on the surface of the fiber filter cloth 4 to prevent the occlusion of the voids, for this purpose, a conventional back washing apparatus of the suction washing method has been used.

Figure 2 is a longitudinal sectional view showing an example of a suction cleaning device for cleaning a conventional fiber disk filter.

Referring to FIG. 2, the suction washing apparatus 6 includes a suction unit 8 mounted on the frame 7, a suction slit 9 provided on one side of the suction unit 8, and a suction unit 8. And a connected suction pump 10. The suction part 8 is in the form of a hollow beam, and on the outer circumferential surface thereof is formed an elongated suction slit 9 in a direction parallel to the surface of the fiber filter cloth. The suction slit 9 is arranged so that the surface thereof faces the surface of the fiber filter cloth 4 covered with a plurality of fleece. The suction pump 10 is connected to the suction part 8 to provide a suction force through the suction slit 9 in the suction direction (the direction in which the foreign matter adsorbed on the fiber filter cloth 4 is separated), whereby Remove any foreign substances remaining on the surface. The removed foreign matter is discharged to the outside together with the treated water (backwash water) that is backwashed.

Republic of Korea Patent Publication No. 10-2000-0016811

By the way, in the conventional suction washing apparatus, there exists a problem that a part of a contaminant or a foreign substance remains on the surface of the fiber filter cloth 4 without being removed despite the suction of the suction part 8. The remaining pollutants or foreign matters are not easily removed by other methods such as increasing suction power or spraying the washing water under high pressure, causing deterioration of cleaning efficiency. Moreover, the problem that the surface of a filter cloth is partially damaged also arises.

In the conventional suction washing apparatus, as shown in FIG. 3, the surface of the suction washing apparatus facing the filter cloth is flat. In the case of the conventional close-type suction washing apparatus having a flat surface, the phenomenon that the foreign matter is stuck to the filter cloth rather than the suction slit by the suction washing device is in close contact with the filter cloth may occur. In addition, when a conventional suction washing apparatus having a flat surface is sucked away at a predetermined interval from the filter cloth, fluid is introduced between the suction washing apparatus and the filter cloth, and the suction force of the suction washing may be weakened.

The present invention has been made to solve the problems of the prior art, it is possible to effectively remove the residual contaminant or foreign matter that is not easily removed by the conventional suction cleaning method can improve the cleaning efficiency, and also the filter cloth It is an object to provide a fiber disk filter filtration device having an improved type of suction cleaning device that can prevent damage.

The suction washing apparatus of the fiber disk filter filtration apparatus according to the present invention for achieving the above object is a suction washing apparatus for suction washing the foreign matter adhering to the fiber filter cloth of the fiber disk filter, the surface of the fiber disk filter A suction part provided in close contact with a suction force for sucking the foreign matter, and a suction slit provided at a side in close contact with the surface of the fiber disk filter at the suction part and forming a passage through which the foreign material is sucked; A part of the peripheral surface surrounding the slit forms a wall surface concavely recessed in a direction away from the surface of the fiber disk filter, and during the suction cleaning, the fleece that has been compressed by the close contact between the suction part and the filter cloth is In the concave recessed wall surface area around the suction slit before reaching the suction slit area. As the fiber filter cloth is gradually unfolded, the fiber filter cloth is released, and in this state, the fiber filtration cloth may be straightly calibrated when the suction slit is reached.

The total straight calibration distance including the impregnated wall surface may be greater than 1 times 4.5 times or less, preferably 3 times the width of the suction slit.

In addition, a portion into which the concavely embedded wall surface is embedded may be bent vertically, embedded, inclined at an angle, or curved to be embedded.

Further, the straight calibration distance including the embedded wall surface is such that the outer width between the outer edges of the embedded wall surface is three times the width of the suction slit, and the inner width between the inner edges of the embedded wall surface is It may be twice the width of the suction slit. In addition, the depth of depression of the embedded wall surface may be 0.2 times the width of the suction slit.

According to the present invention, the wall surface around the suction slit of the suction washing apparatus is formed to be recessed in a direction away from the surface of the fiber disk filter, so that the straightening is performed while the fiber filter cloth of the fiber disk filter is pressed against the surface before reaching the suction slit. As a result, it is possible to effectively remove contaminants or foreign substances remaining between the fiber filter cloths which are not easily removed by the conventional suction washing method, thereby improving the washing efficiency, and also the fiber filter cloths are sharply broken in the suction slit and damaged. This prevents damage to the filter cloth.

1 is a perspective view showing an example of a conventional fiber disk filter filtration apparatus.
Figure 2 is a longitudinal sectional view showing an example of a suction cleaning device for cleaning a conventional fiber disk filter.
3 is a cross-sectional view illustrating the cleaning principle of a conventional fiber disk filter suction cleaning apparatus.
Figure 4 is a cross-sectional view showing the cleaning principle of the fiber disk filter suction cleaning apparatus according to the present invention.
5A is a cross-sectional view of an improved (impregnated wall surface) type suction cleaning apparatus according to the present invention.
5B is a front view of an improved suction cleaning device according to the present invention.
Figure 6a is a front photograph of the improved suction cleaning device according to the present invention.
Figure 6b is a side view of the improved suction cleaning device according to the present invention.
Figure 6c is a photograph measuring the inside of the straight calibration distance of the suction washing apparatus.
6D is a photograph of measuring the outside of the straight calibration distance (total straight calibration distance) of the suction washing apparatus.
Fig. 7A is a front photograph of a suction apparatus of the conventional type (planar surface contact type).
7B is a side photograph of a conventional suction cleaning apparatus.
Figure 8 is a photograph of the cleaning state of the fiber disk filter by a conventional suction washing apparatus.
9 is a photograph of a washing state of the fiber disk filter by the suction cleaning device of the improved type 2.

Advantages, features, and a method of achieving the present invention will become more apparent with reference to the following embodiments in conjunction with the accompanying drawings. Hereinafter, a suction washing apparatus of a fiber disk filter filtration apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The present inventors earnestly examined and studied through various experiments and analyzes on the cause of the removal of some of the foreign substances in the conventional suction cleaning method.

3 is a cross-sectional view illustrating the cleaning principle of a conventional fiber disk filter suction cleaning apparatus.

Referring to FIG. 3, the suction part is brought into close contact with the surface of the filter cloth with the suction slit facing the surface of the filter cloth, and the foreign matter adsorbed on the surface of the filter cloth through the suction slit while moving the filter cloth from one end to the other end. At this time, the fleece of the surface of the filter cloth reaching the suction slit area is unfolded in a straight line toward the inside as it is sucked into the suction slit by the suction flow (straight straightening), and thus foreign matter adsorbed between the fleece The surface of the filter cloth is cleaned as they are separated from the villus.

However, some of the foreign matter that was strongly pressed onto the surface by the close contact with the suction part and the filter cloth before reaching the suction slit area remain in the compressed state between the fleece even if the fleece suddenly straightens to the suction slit area. It is not removed from the surface and remains. For this reason, according to the conventional suction washing method, the foreign matter remaining on the surface of the fiber filter cloth cannot be completely removed and a problem of lowering the cleaning efficiency occurs.

As a result of the research of the present inventors, it has been found that there is a problem in that a conventional suction device cannot completely remove the contaminant or foreign matter compressed between the fleece due to the close contact between the suction part and the filter cloth. In addition, when the fleece is sucked into the suction slit, the filament may be sharply bent at the edge of the slit, and the fleece may be pulled out or cut off, which causes the filter cloth to be damaged.

The present inventors have long researched and reviewed the improvement that can solve this problem, and it is possible to completely remove the contaminated source when it reaches the suction slit area by releasing the surface pressed before reaching the suction slit area. In addition, the present invention can be devised to prevent damage to the filter cloth.

Figure 4 is a cross-sectional view showing the cleaning principle of the suction washing apparatus of the fiber disk filter filtration device according to the present invention.

Referring to Fig. 4, the difference from the conventional suction washing apparatus is that a part of the wall surface surrounding the opening of the suction slit is recessed inward to form a step. Due to this step, the fleece, which has been compressed by the close contact between the suction part and the filter cloth, is gradually stretched in the wall surface (step surface area) around the slit by the suction flow before reaching the suction slit area, and thus the close contact between the fleece. Alternatively, the compressed state is eliminated and foreign matter adsorbed between the fleece is likely to fall off. When placed in the suction slit zone in this state, the suction is completely straightened by the suction flow in the suction slit, and foreign matter adsorbed between the fleece is separated from the fleece and is very easily removed from the surface of the filter cloth. Therefore, no foreign matter remains between the fleece, so that foreign matter remaining on the surface of the filter cloth can be completely removed and the cleaning efficiency can be significantly improved. In addition, since the fleece is gradually extended in the stepped area, the filament can be effectively prevented from damaging the surface of the filter cloth such as being pulled out or cut out while being sharply bent at the opening edge of the slit.

The present inventors conducted a washing test to verify the effect of this suction washing apparatus according to the present invention. Hereinafter, the test method and the results will be described in detail.

1. Test Overview

The research team of Yuchun Enviro Institute of Environmental Technology researched the conventional type (flat surface) under the same condition of the immersion type fiber disk filter pilot equipment at the end of the final settling tank of the filtration facility of Ilsan Eco-Friendly Office from January 11 to January 17, 2013. The cleaning power and backwash amount of the contact type) and the improved (impregnated wall surface type) suction cleaning device according to an embodiment of the present invention were compared.

2. Testing method

The final sedimentation tank effluent from Ilsan Eco-Friendly Plant was tested in 24 hours / day continuous operation. The effluent was filtered using an immersion fiber disk filter, followed by suction washing. After equipped with the conventional and improved suction washing apparatus, respectively, the results were compared through the wash water condition and backwash amount.

3. Testing device

The specifications of the test apparatus are shown in Table 1 below.

turn Device name Specifications
One
Fiber Disc Filter Body ① Type: YDFS-1001-1F (Tank Equipment Type)
② Fiber Disk Quantity: 1 Disk / Set
③ Water level detector: electrode type
④ Quantity: 1 Set
2
Fiber Disc Filter Drive Motor ① Type: Double Worm Geared Type (VVVF)
② Power: 0.37kW
③ Quantity: 1 Set
3
Fiber Disc Filter Suction Wash Pump ① Type: Volute centrifugal pump
② Power: 1.6kW
③ Quantity: 1 Set
4
Suction cleaning device (conventional type) ① Type: Fiber yarn surface contact type
② Straightening distance (C) / Slit gap (B): 1 (without inside and outside division)
③ Depression depth (A) / Slit spacing (B) of wall surface: 0
④ Quantity: 1 Set
5
Suction Cleaner (Improvement Type 1) ① Type: Wall suction cup type
② Straightening distance (C) / Slit gap (B): 2 (outside), 1.2 (inside)
③ Depression depth (A) / Slit spacing (B) of wall surface: 0.2
④ Quantity: 1 Set
6
Suction Cleaner (Improvement Type 2) ① Type: Wall suction cup type
② Straightening distance (C) / Slit gap (B): 3 (outside), 2 (inside)
③ Depression depth (A) / Slit spacing (B) of wall surface: 0.2
④ Quantity: 1 Set
7
Suction Cleaner (Improvement Type 3) ① Type: Wall suction cup type
② Straightening distance (C) / Slit gap (B): 4.5 (outside), 3.5 (inside)
③ Depression depth (A) / Slit spacing (B) of wall surface: 0.2
④ Quantity: 1 Set

Fig. 5A is a sectional view of an improved (impregnated wall surface type) suction cleaning device, and Fig. 5B is a front view thereof. Here, A represents the depth of penetration (step height) of the wall surface, B represents the slit spacing (width), and C represents a linear straightening distance (width of the region where the fleece is straightened by suction flow). The arrow is the suction wash direction.

6A is a front photograph of an improved (impregnated wall surface type) suction washing apparatus, and FIG. 6B is a side photograph thereof.

As shown in Table 1 and FIGS. 5A, 5B, 6A, and 6B, the improved type (with embedded wall surface type) has a step surface in which the wall surface around the slit (for example, upper and lower sides) is embedded inward from the surface of the device. It is. In this test, one set of three improved types having different sets of straight line correction distances including the step area was prepared. In Table 1, the straight calibration distance inside is a value obtained by measuring the inner shortest distance corresponding to the width between the inner edges of the wall surface around the slit (20 mm in FIG. 6C), as shown in FIG. 6C. The distance outside is a measure of the outer longest distance (total straight calibration distance) corresponding to the width between the outer edges of the wall surface around the slit, as shown in FIG. 6D (about 30 mm in FIG. 6D). The slit gap (width) and the immersion depth (step height) of the wall surface are all the same.

FIG. 7A is a front photograph of a suction apparatus of a conventional type (planar surface contact type), and FIG. 7B is a side photograph thereof.

As shown in Table 1 and Figs. 7A and 7B, the conventional type (planar surface contact type) has no wall surface (step) formed around the slit. Therefore, the entire surface except the slit is in close contact with the surface of the fiber disk filter. The slit spacing (width) is the same as the improved one.

4. Test Results

1) washing status

The cleaning condition was determined by visually observing the final surface condition of the fiber disk filter cleaned by each suction holder.

8 to 9 are photographs taken of the washing state of the fiber disk filter after the washing test. FIG. 8 is a fiber disk filter cleaned by a conventional type (flat surface contact type), and FIG. 9 is a fiber disk filter washed by an improved type 2 as one example of an improved type (embedded wall surface preparation type).

As can be seen from Figures 8 to 9, in the case of the fiber disk filter washed in the conventional type (Fig. 8), the surface of the washing condition was not good, but in the case of the fiber disk filter washed with the improved type 2 (Fig. 9 ), The cleaning state of the surface was found to be better than the conventional type.

2) backwash and wash water turbidity

Table 2 shows the results of the backwashing and wash water turbidity test by the suction washing apparatus of the conventional and improved type 1 to 3. The inflow flow rate was 150 m 3 / day and the suction volume was 6.91 m 3 / hour. The chemical input amount was 25 ppm of 17% poly aluminum chloride (PAC) as a flocculant.

division Stop time (minutes) Cleaning time (min) Backwash amount (%) Back tax Backwash Turbidity Backwash Turbidity Ranking Conventional 5.25 0.35 6.90 4 127.0 3 Improved Type 1 5.56 0.33 6.20 3 124.0 4 Improved Type 2 8.20 0.25 3.27 One 220.0 One Enhanced 3 6.03 0.29 5.07 2 160.0 2

As can be seen from Table 2, in the case of the improved type 1 to 3, all the backwash amount decreased and the backwash turbidity increased compared to the conventional type. In particular, in case of the improved type 2 in which the total straight line correction distance (C) / suction slit width (B) was set to 3, the backwash amount was reduced by an average of 50% or more compared to the conventional type, and the lowest value was shown. Peaked at more than 70%. The decrease in backwash amount increases the effectiveness of washing, and the increase in backwash turbidity can be seen as the increased concentration of backwash. The order of decreasing backwash amount, that is, the order in which the effect of washing is good, is improved 2, improved 3, improved 1, and conventional, and the order of higher backwash turbidity, that is, higher backwash concentration, is improved 2 , Improved 3, conventional, improved 1.

For Improved Type 2, the fiber filter cloth (crush) is pressed against the surface before reaching the suction slit at an optimal ratio from the wall surface around the slit (i.e. total straight calibration distance (C) to the suction slit width (B)). It is interpreted that the best cleaning effect and the concentration of backwashing are obtained because the straight correction is performed by 3 times) to remove the contaminants or foreign substances that were pressed between the melts to near perfection.

On the other hand, if the total straight calibration distance (C) compared to the suction slit width (B) greater than 4.5 times, the cleaning time is reduced, but the stop time is also reduced, the cleaning power is also compared to the suction slit width (B) The total straight calibration distance (C) was found to be weaker than three times (improvement 2). This indicates that increasing the ratio of the straight calibration distance indefinitely does not improve the washing power.

As such, when the total straight calibration distance (C) to the suction slit width (B) was set at a ratio of three times (improvement type 2), the backwash amount was measured at the lowest value, and the backwash turbidity was measured at the highest value.

As mentioned above, although one Example of this invention was described with reference to an accompanying drawing, this invention can be implemented in other specific forms, without changing the technical idea or an essential feature. For example, the suction unit may be a means for providing a function or a function of inhaling and removing foreign substances, and is not limited to the hollow beam shape as in the present embodiment. Similarly, the suction slit is not limited to the elongated straight line shape but may have various shapes such as a curve and a polygon. In addition, although the wall surface around the slit is illustrated as a recessed step surface, for example, it may be formed in various shapes such as curves and trapezoids if the structure provides a straightening correction function. In addition, a straight line straightening means a state in which the fiber filter cloth (fleece) in the pressed state is straightened by suction flow, and in the case of forming a fully straightened state even in the case of partially curved or vibrating, not necessarily a straight line. This corresponds.

Therefore, the above-described embodiments described herein are illustrative in all respects and should not be understood as limiting the present invention, and the scope of the present invention is defined by the claims below, and is set forth in the claims. All changes or modifications derived from the ranges and equivalents thereof should be construed as being included in the scope of the present invention.

1: filtration device 2: rotary drum
3: disc filter segment 4: fiber filter cloth
5: inlet 6: suction cleaning device
7: frame 8: suction
9: suction slit 10: suction pump

Claims (6)

A fiber disk filter filtration device having a suction cleaning device for suction cleaning of foreign matter adhered to a fiber filter cloth of a fiber disk filter,
The suction cleaning device,
A suction part in close contact with the surface of the fiber disk filter and providing a suction force for suctioning the foreign matter;
A suction slit provided at a side in close contact with the surface of the fiber disk filter at the suction part and forming a passage through which the foreign matter is sucked;
A part of the peripheral wall surface surrounding the suction slit forms a wall surface recessed concave in a direction away from the surface of the fiber disk filter,
In suction washing, the fiber filter cloth is brought into close contact with the fleece, which has been compressed by the close contact between the suction part and the filter cloth, gradually spreads in the recessed recessed wall surface area around the suction slit before reaching the suction slit area. Is released and is straightened when the suction slit is reached in this state. The method of claim 1,
And a total straight calibration distance including the impregnated wall surface is greater than 1 times and less than 4.5 times the width of the suction slit. 3. The method of claim 2,
And a total straight calibration distance including the impregnated wall surface is three times the width of the suction slit. 4. The method according to any one of claims 1 to 3,
Fibrous disk filter filtration device having a suction cleaning device, characterized in that the indented portion of the wall surface is recessed or bent indented. 4. The method according to any one of claims 1 to 3,
Fibrous disk filter filtration device having a suction cleaning device, characterized in that the concave indented wall surface is embedded is bent vertically. 5. The method of claim 4,
The straight calibration distance including the embedded wall surface is such that the outer width between the outer edges of the embedded wall surface is three times the width of the suction slit and the inner width between the inner edges of the embedded wall surface is the suction. Fiber disk filter filtration device having a suction washing device, characterized in that twice the width of the slit.

Images