KR20020080293A - Disk filter - Google Patents

Abstract

[assignment]

The present invention has a low head loss compared to a conventional filter paper or filter, and obtains a very high filtration rate even under hydraulic load and surface load. In addition, various pollutants are filtered using a pile fabric made of micro-fabric material, and an automatic backwashing effect is obtained from automatic control of an ultrasonic transducer.

[Resolution]

The present invention provides a filtration method for sewage or sewage and waste water, comprising a filter disc assembled by a filter fixing unit along a hollow shaft and a collecting pipe installed in a longitudinal direction in a filtration tank, wherein the hollow pipe is a filter disc and an external discharge pipe from the filtration tank. Is connected. Therefore, it consists of a driving device that can rotate from the head difference, a high pressure washing nozzle and pump, an ultrasonic transducer, and a suction device. Regardless of the filtration rate, soluble substances, colloidal substances or residual contaminants caused by SS (P <0.2 mg / l, SS <1.5 mg / l) can be kept below.

Description

Disk filter {DISK FILTER}

[Industrial use]

The present invention relates to a disk-type filtration system for advanced sewage or wastewater treatment, and more particularly, soluble material, colloidal material or suspended solids (SS) at the same time depending on the properties of the treated water even after the first to second treatment. It provides advanced treatment technology to remove and to prevent environmental pollution from the simplification of the facility.

[Prior art]

The present invention relates to a filtration device for sewage or sewage and wastewater, and performs a filtration function using a multi-disc filter.

In order to prevent water pollution in the prior art, various kinds of filtration devices or filter papers are mainly used, but it requires a lot of devices and facilities, and the same filtration state as the first time even if backwashing is caused by clogging and microbial adhesion propagation. Since it is almost impossible to maintain the filter medium or filter had to be cleaned or replaced periodically.

Therefore, some patent technologies have been reported as a conventional disc filter technology, but many of them have been developed with the focus on removing suspended solids. Korean Patent Publication No. 2001-0052119, US Patent No. 930543, and Swedish Patent No. 224,131. Is disclosed.

However, the prior art is introduced through the filter disk radially assembled to the central rotatable central discharge pipe and the filtered water flowing through the opening of the collecting pipe flows naturally into the discharge chamber. Therefore, the conventional technology improves the filtration efficiency by periodically washing the outside of the filter portion by high pressure spray of washing water, but it is a difficult problem to remove the microorganisms and suspended solids attached to the inside of the filter portion to their original state.

In order to solve this problem in the present invention, by adding a float suction device, a high pressure cleaning device, and an ultrasonic transducer on the outer side of the disk filter to remove the suspended solids and adherent breeding microorganisms attached to the outer and inner sides of the disk filter. The present invention has been completed by researching and developing a method of simplifying processing time and maintenance by automatically controlling a method and a processing process.

Accordingly, the present invention is to solve the problems of the prior art as described above, the present invention passes through a plurality of disk filters (Disk Filter) in the filtration tank to remove various contaminants, and suspended solids attached to the outside and inside the filter and The biofilm is removed quickly to increase the filtration efficiency and to obtain treated water that meets environmental standards.

1 is a cross-sectional view of a disk filter according to an embodiment of the present invention

2 is a side view of a disk filter drive unit according to an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

1: filtration tank 2: disc filter

3: hollow shaft 4: central collecting pipe

5: drive unit 6: chain & sprocket

7: high pressure washing nozzle 8: ultrasonic transducer

9 control device 10 level sensor

11 pump 12 filter frame unit

13 filter box 14 suction device

[Means for solving the problem]

In order to achieve the above object, the present invention will be described with reference to the accompanying drawings the technical idea in the method of physically treating sewage or wastewater using a disk filter. 1 is a schematic diagram of a disk filter according to an embodiment of the present invention, and FIG. 2 is a side view of a disk filter driving unit according to an embodiment of the present invention.

In order to achieve the above object, in the rotary disk filter device, a float suction device, a high pressure washing nozzle, and an ultrasonic transducer are installed on the disc filter outer shaft, and the sewage introduced into the filtration tank is filtered through the disk filter and the filtered water is It is discharged through the inside of the central collecting pipe by gravity. At this time, solids accumulate on the outer surface of the disk filter and the inner surface of the disk filter to form a layer and microorganisms adhere to and propagate.

Therefore, the water level of the filtration tank rises. The level in the tank or the level of the outlet is detected by a differential pressure gauge or a water gauge. When the water level in the tank reaches the set value, the differential pressure gauge or water gauge is connected to the PLC control device, and the suction device, the backwash pump, and the ultrasonic transducer are operated in sequence, followed by the driving motor, which rotates the disk filter hollow shaft at low speed, and the backwash automatically operates. Begins.

Under normal operating conditions, the disk filter is kept submerged and stopped in rotation to improve the settling of the incoming solids. However, the operation of the backwash pump is performed by the disk filter at the top of the water surface, and the suction device is also linked to the same time operation. Ultrasonic transducers operate under water for some time. At this time, the precipitated solids are discharged by the suction pipe and the sludge pump installed in the chamber below the filtration tank. In addition, solids and microorganisms attached to the inside of the disk filter are detached and discharged according to the operation of the ultrasonic transducer.

Here, the mixed solution of the separated suspended matter and sludge is transferred to the reaction tank to provide a high-treatment method characterized in that the bioreaction and self-oxidation.

EXAMPLE

Preferred embodiments of the present invention configured as described above are shown in the accompanying drawings, with reference to this will be described in more detail with respect to the present invention. However, the following examples are provided only for easy understanding of the present invention, and the present invention is not limited to the following examples, which are obvious to those skilled in the art.

1 is a cross-sectional view of a rotating disk filter applied to the present invention. The general embodiment with reference to FIG. 1 is described below.

Experiments of the rotating disk filter 2 were carried out after the SBR discharge process for the advanced treatment of biological nitrogen and phosphorus in general municipal sewage. It was carried out in a pilot plant having a 100 m 3 / hr filtration capacity of general municipal sewage.

The filtration rate of the pilot plant was maintained at 10-15 m / h and SS, COD, and TP were measured. Therefore, the resistivity coefficient (K [cm / (m / h)) of the backwashed filter cloth is determined by the ratio of the initial head difference (dH _min [cm]) and the filtration rate (V _F [m / h]) after the backwash. In order to obtain the resistivity coefficient of the filter cloth effective area, the hydraulic losses of the disk structure were excluded from the calculation.

In order to remove the solids, the maximum suction force of the suction device is 0.15∼0.29m / s, the pressure of the high pressure washing nozzle is 10-20bar, and the transducer power 600 ~ 1200w of the ultrasonic transducer is added to operate the disk filtration device for 24 hours. Automatic backwashing.

The filter cloth used in the filter cloth test was made of pile fabric, and the material of this fabric was polyamide. The length of the cilia was 10 to 15 mm and the diameter of the round cilia was 20 to 30 μm. .

The structure of the rotating disk filter 2 includes a hollow shaft 3 in the center portion rotatably arranged about a central horizontal longitudinal axis and configured to receive the filtrate. The central collecting pipe 4 is connected to the outside of the hollow shaft 3, where a number of parallel disc shaped filters extend radially transversely from the hollow shaft 3. Each fan-shaped disc filter extends along 60-120 ° of the wedge portion of the central collecting pipe 4, and has a disc shape in which two to six disc filters 2 are coaxially arranged with the hollow shaft 3 together. To form a disk filter (2). These disc filters 2 are arranged parallel to each other along the hollow shaft 3 and the central collection pipe 4 and spaced apart from each other in the axial direction by an equal distance.

Each disc filter 2 preferably comprises a filter frame unit 12 fixedly connected to the hollow shaft 3 and the central collection pipe 4 by bolts. Moreover, on two opposing sides of each filter frame unit 12, it comprises a filter portion of filter fibers, which filter portion is supported by and arranged on the opposing side thereof.

The filter portion of each filter frame unit 12 defines a filter box 13 together with the filter frame unit 12, which extends from the hollow shaft 3 and the central discharge pipe 4 through the filter box 13. It passes through the unit and enters the central discharge pipe 4 and extends outward along the discharge chamber. Thus, the liquid is filtered through the filter portion as it flows from outside to inside. As a result, particles that cannot pass through the filter fibers are sedimented by gravity and collected into the chamber below the filtration tank 1. In the side region of the rotary disk filter 2 there is arranged a suction device 14 for absorbing the suspended matter attached to the filter and a high-pressure jetting device that is a washing device, that is, a high pressure washing nozzle 7 and an ultrasonic transducer 8, Particles attached to the outside of the filter fiber by the washing nozzle 7 and the suction device 14 are detached and collected or returned to the chamber below the filtration tank 1. Thus, the suspended matter and microbial membrane inside the filter fiber are detached and collected into the central collecting pipe 4 and returned to the reactor. In particular, an ultrasonic transducer 8 is arranged on the filter side in order to remove residual adherent particles inside the filter fiber, and the omnidirectional ultrasonic wave radiates radially a frequency between 600 to 1200 watts and 28 to 40 kHz at the power of the ultrasonic transducer 8. Energy is applied to remove adherent particles.

The filter portion shown in FIG. 1 is assembled into a filter box 13, each of which comprises micro filter fibers covered in a frame. The filter box 13 comprises holding openings formed along the respective parts of the filter frame unit 12 and the central collecting pipe 4 by means of fastening and clamping means, which are in accordance with the clamping means with the filter frame unit 12. The connection is assembled.

The filter fibers are attached to a filter box 13 consisting of flat metal or plastic rods of cross section, which are adhesively assembled to each other. The filter box 13 is fixed to the filter frame unit 12 and supported by the hollow shaft 3 clamping means.

The rotary disc filter 2 is introduced into the bottom of the filtration tank 1 through a baffle inlet on the side of the filtration tank 1 by a water level difference or a pump, and the sewage introduced by the hydraulic force is very slow. By moving to the upper water level of the furnace to prevent swirl flow in the filtration tank (1), sediment and sewage is filtered through the disk filter (2) at the same time as settling, the filtered treated water is passed through the central collecting pipe (4) to the discharge pipe Discharged.

At this time, when the suspended solids of the disk filter 2 is accumulated, the water level in the tank is increased, and the water level sensor 10 attached to the tank is linked with the control device 9 to operate the ultrasonic transducer 8.

Next, the sewage in the tank is transferred to the reactor, and then backwashing starts automatically as the pump 11 and the driving motor 5 operate.

The disk filter 2 in a normal operating state proceeds in a static state in which the disk filter 2 is deposited in sewage water in order to actively settle the inflow solids.

The above description is provided for specific terminology for the purpose of understanding the invention for purposes of illustration. However, to those skilled in the art, the detailed description is not a requirement for practicing the present invention.

In addition, the treatment efficiency was tested using the rotating disk filter 2 of the filtration tank 1 according to the present invention. Table 1 shows the treatment efficiency of suspended solids (SS) in the present invention filtration apparatus.

TABLE 1

By filtering suspended solids of sewage or sewage or wastewater of the present invention, the treated water that meets the water quality inspection criteria is obtained, and in performing the method of the present invention, the suspended solids and microbial membranes attached to the inside of the filter to reduce the filtration efficiency are absorbed by an ultrasonic transducer and suction. It is equipped with a device and a cleaning device to provide a method for cleaning the filter to increase the processing efficiency and the running cost can be reduced by simplifying the facility.

Claims (2)

In the disk filter, A hollow shaft (3) having a central longitudinal axis deposited from the upper water level (TWL) of the filtration tank (1) and capable of rotating about the longitudinal axis; A central collecting pipe 4 connected to the outer circumference of the hollow shaft 3 in a double manner; A filter box 13 comprising one or more filter frame units 12 connected radially; A driving device (5) interlocked with the hollow shaft (3) and the central collection pipe (4) with a chain & sprocket (6); The sewage or wastewater introduced into the filtration tank 1 is filtered into the inside of the disc filter 2, and is received by the central collection pipe 4 and discharged to the discharge pipe on the side wall of the filtration tank 1. Type rotary disc filter. The method of claim 1, In the cleaning method of the rotary disk filter (2), it is a micro filter fiber, preferably composed of polyester fiber (Cloth-Media) and the opening of the filter has a filter section having a range of 10 ~ 100㎛ 7 high pressure washing nozzle (7) ), The suction device 14, and the ultrasonic transducer 8 on the side of the disk filter 2, and the ultrasonic supply stage radiates radially radiated ultrasonic energy with a frequency between 28 and 40 kHz at a transducer power between 600 and 1200 watts. Supplying; Washing the water supply step of the high pressure washing nozzle 7 at a pressure of 10 to 20 bar; Suctioning the suspended matter suction force of the suction device 14 at 0.15-0.29 m / sec; A backwash method comprising backwashing suspended matter and microorganisms attached to a filter while rotating at a circumferential speed of 3 to 10 m / min by a drive device of the disk filter (2).