KR101345261B1 - Filtering apparatus without back wash - Google Patents

Filtering apparatus without back wash Download PDF

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Publication number
KR101345261B1
KR101345261B1 KR1020120084877A KR20120084877A KR101345261B1 KR 101345261 B1 KR101345261 B1 KR 101345261B1 KR 1020120084877 A KR1020120084877 A KR 1020120084877A KR 20120084877 A KR20120084877 A KR 20120084877A KR 101345261 B1 KR101345261 B1 KR 101345261B1
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South Korea
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filter cloth
filtering
filtration
raw water
inner cylinder
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KR1020120084877A
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Korean (ko)
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김선희
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이전웅
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

The present invention relates to a filtering apparatus without back wash, comprising: a filtering sheet storage unit storing the filtering sheets; an inner container comprising a porous pipe; an outer container accommodating the inner container; a filtering unit filtering the raw water introduced by the filtering sheet; and a body part having a storage space storing waste filtering sheets in the lower part, supporting the filtering unit and filtering sheet storage unit. The filtering apparatus without back wash does not require installation of extra apparatus compared to existing apparatus by not requiring a back wash process through a successive filtering using the endless type filtering sheet. The filtering apparatus is capable of an economical operation with a short replacement period.

Description

무역세 여과장치{FILTERING APPARATUS WITHOUT BACK WASH}Trade tax filtration device {FILTERING APPARATUS WITHOUT BACK WASH}

본 발명은 무역세 여과장치에 관한 것으로, 보다 상세하게는 엔드리스형의 여과포를 이용하여 연속적인 여과가 가능함으로써 역세 공정이 필요없는 무역세 여과장치에 관한 것이다.
The present invention relates to a trade tax filtration apparatus, and more particularly, to a trade tax filtration apparatus that does not require a backwashing process by enabling continuous filtration using an endless filter cloth.

일반적으로 여과장치의 운전은 여과공정과 세척공정으로 나누어 지는데, 여과공정이란 부유물질을 함유한 원수를 여과장치에 유입시켜 부유물질이 제거된 깨끗한 여과수를 배출시키는 공정으로, 원수중의 부유물질을 여과장치의 여과층 내의 공극에 체분리, 침전, 관성충돌, 차단, 흡착, 응집 등의 복잡한 메카니즘으로 억류·포획시키고, 깨끗한 물만 여과수로서 배출시키는 과정이다. In general, the operation of the filtration apparatus is divided into a filtration process and a washing process. The filtration process is a process in which raw water containing suspended solids is introduced into the filtration apparatus to discharge clean filtered water from which suspended substances are removed. It is a process of detaining and capturing the pores in the filtration layer of the filtration device by complicated mechanisms such as sieving, sedimentation, inertia collision, blocking, adsorption, and coagulation, and discharging only clean water as filtered water.

상기 여과공정을 계속하게 되면 여과층 내의 공극은 점점 부유물질로 채워지고 여과저항이 증가하여 더 이상 여과공정을 계속할 수 없는 상태에 이르게 된다. 이때 깨끗한 세척수와 공기 등을 주입하여 공극에 포획된 부유물질을 배제시키기 위한 세척공정이 필요하다.         If the filtration process is continued, the voids in the filtration layer are gradually filled with suspended solids and the filtration resistance is increased, leading to a state in which the filtration process can no longer continue. In this case, a cleaning process is required to exclude suspended solids trapped in the pores by injecting clean water and air.

도 1은 섬유여재를 이용하여 원수를 여과하는 일반적인 여과장치의 단면도이다. 도 1을 참조하면, 여과공정시 원수는 원수 인입구(100)를 통하여 여과장치로 유입되며, 섬유여재(20)에 의해 여과된 후 처리수 배출구(300)를 통하여 배출된다. 그러나 시간이 지남에 따라 섬유여재(20)의 여과저항이 증가하게 되며 따라서 역세공정이 필수적으로 필요하게 된다. 1 is a cross-sectional view of a general filtration device for filtering raw water using a filtrate. Referring to FIG. 1, during the filtration process, raw water is introduced into the filtration apparatus through the raw water inlet 100 and filtered through the fibrous media 20 and then discharged through the treated water outlet 300. However, as time passes, the filtration resistance of the fibrous media 20 increases, and thus, a backwashing process is necessary.

역세공정이란 여과공정과는 반대로 역세수를 처리수 배출구(300)를 통하여 유입시켜 섬유여재(20)에 부착된 오염물질을 제거하는 공정을 말한다. 그러나 이러한 역세공정은 여과공정의 중단을 가져오게 되며 많은 운전비용과 노력을 요하는 문제점이 있다.
The backwashing process refers to a process of removing contaminants attached to the fibrous media 20 by introducing backwash water through the treated water outlet 300 as opposed to the filtration process. However, this backwashing process leads to the interruption of the filtration process, which requires a lot of operating costs and efforts.

본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위한 것으로, 본 발명의 목적은 엔드리스형의 여과포를 이용하여 연속적인 여과가 가능함으로써 역세 공정이 필요없는 무역세 여과장치를 제공하는 것이다.
The present invention is to solve the problems of the prior art as described above, it is an object of the present invention to provide a trade tax filtration apparatus that does not require a backwashing process by enabling continuous filtration using an endless filter cloth.

상기와 같은 목적을 달성하기 위한 본 발명의 하나의 양상은, 여과포를 저장하는 상부의 여과포 저장부와 다공관으로 이루어진 내통 및 상기 내통이 수용되는 외통을 포함하며 상기 여과포에 의해 유입되는 원수를 여과하는 여과부 및 상기 여과포 저장부와 여과부를 지지하며 하부에는 사용을 마친 폐여과포가 저장되는 저장공간을 가지는 몸체부를 포함하는 무역세 여과장치에 관한 것이다.One aspect of the present invention for achieving the above object, including the inner cylinder consisting of the upper filter cloth storage unit and the porous tube for storing the filter cloth and the outer cylinder is accommodated and filtering the raw water introduced by the filter cloth The present invention relates to a filtration unit and a filter unit including a body part having a storage space in which a used waste filtration cloth is stored, and supporting the filter cloth storage part and the filtration part.

본 발명의 일 구현예에 따른 무역세 여과장치에 있어서, 여과포는 여과포 저장부의 상부에서 아래쪽으로 내려와 여과부의 내통을 둘러싸며, 몸체부에 설치된 감속기에 의해 아래쪽으로 끌어내려지는 것을 특징으로 한다.         In the trade tax filtration device according to an embodiment of the present invention, the filter cloth is lowered from the top of the filter cloth storage portion to surround the inner cylinder of the filter portion, characterized in that pulled down by the reducer installed in the body portion.

본 발명의 일 구현예에 따른 무역세 여과장치에 있어서, 원수는 원수 인입구를 통하여 여과부의 아래쪽에서 유입되며, 여과된 처리수는 내통 상부의 처리수 배출구를 통하여 배출되는 것을 특징으로 한다.In the trade tax filtration device according to an embodiment of the present invention, raw water is introduced from the bottom of the filtration unit through the raw water inlet, and the filtered treated water is discharged through the treated water outlet in the upper portion of the inner cylinder.

본 발명의 일 구현예에 따른 무역세 여과장치에 있어서, 원수는 싸이클론 방식으로 유입되어 1차적으로 입자 크기가 큰 물질은 하부로 침강하여 배출되는 것을 특징으로 한다.
In the trade tax filter device according to an embodiment of the present invention, the raw water is introduced into the cyclone method, characterized in that the material having a large particle size is settled and discharged downward.

본 발명에 따른 상기 무역세 여과장치는, 엔드리스형의 여과포를 이용하여 연속적인 여과가 가능함으로써 역세 공정이 필요없는 효과가 있다.The trade tax filtration device according to the present invention has the effect of not requiring a backwashing process by enabling continuous filtration using an endless filter cloth.

또한 본 발명에 따른 상기 무역세 여과장치는 2차적인 폐수의 발생을 최소화하고, 기존의 장치에 비하여 부수장치의 설치가 필요없고 여과포의 교체 시간도 매우 짧아 경제적인 운전이 가능한 효과가 있다.
In addition, the trade tax filtration device according to the present invention minimizes the occurrence of secondary wastewater, there is no need to install a secondary device compared to the existing device and the replacement time of the filter cloth is very short, there is an effect possible to operate economically.

도 1은 섬유여재를 이용하는 일반적인 여과장치의 단면도이다.
도 2는 본 발명의 일 구현예에 따른 무역세 여과장치의 단면도이다.
도 3은 도 2에 따른 여과장치의 여과포 저장부에 대한 단면도이다.
도 4는 도 2에 따른 여과장치의 폐여과포 저장공간에 대한 단면도이다.
도 5는 본 발명에서 사용되는 여과포의 사진이다.1 is a cross-sectional view of a general filtration device using a filtrate.
2 is a cross-sectional view of the trade tax filtration apparatus according to an embodiment of the present invention.
3 is a cross-sectional view of the filter cloth storage unit of the filtration device according to FIG.
4 is a cross-sectional view of the waste filter cloth storage space of the filtration apparatus according to FIG.
5 is a photograph of the filter cloth used in the present invention.

이하, 본 발명의 바람직한 구현예에 대하여 첨부된 도면 등을 참조하여 더욱 상세히 설명한다. 또한, 본 발명을 설명함에 있어서, 관련된 공지의 범용적인 기능 또는 구성에 대한 상세한 설명은 생략한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known general functions or configurations will be omitted.

본 발명은 엔드리스형의 여과포를 이용하여 연속적인 여과가 가능함으로써 역세 공정이 필요없는 무역세 여과장치에 관한 것이다.The present invention relates to a trade tax filtration apparatus that does not require a backwashing process by enabling continuous filtration using an endless filter cloth.

도 2는 본 발명의 일 구현예에 따른 무역세 여과장치의 단면도이고, 도 3은 상기 무역세 여과장치의 여과포 저장부에 대한 단면도이며, 도 4는 폐여과포 저장공간에 대한 단면도이고, 도 5는 본 발명에서 사용되는 여과포의 사진이다.2 is a cross-sectional view of a trade tax filtration device according to an embodiment of the present invention, Figure 3 is a cross-sectional view of the filter cloth storage unit of the trade tax filter device, Figure 4 is a cross-sectional view of the waste filter cloth storage space, Figure 5 Is a photograph of the filter cloth used in the present invention.

도 2 내지 도 5를 참조하면, 본 발명의 일 구현예에 따른 무역세 여과장치는 크게 상부의 여과포 저장부(10)와 중간부의 여과공정이 수행되는 여과부(20)와 하부의 몸체부(30)를 포함하여 이루어진다.2 to 5, the trade tax filtration device according to an embodiment of the present invention is largely the filtration unit 20 and the body portion of the lower filtration unit 10 and the middle filtration process is carried out ( 30) is made.

상기 여과포 저장부(20는 여과포(A)를 저장하는 공간으로서, 중공의 원통형으로 이루어지며 그 중앙에는 처리수 배출관(25)이 관통한다. 상기 처리수 배출관(25)의 주위로는 도 3에 도시된 바와 같이 엔드리스형 여과포(A)가 여러 켭 접철된 방식으로 저장된다. 상기 여과포(A)는 상부쪽에서부터 아래쪽으로 끌어 내려지며, 이어 설명할 여과부(20)의 내통(21)을 둘러싸게 된다. 상기 여과포(A)의 재질로는 공지된 엔드리스형 여과포 중 목적에 따라 적절하게 선택하여 사용할 수 있다. The filter cloth storage unit 20 is a space for storing the filter cloth A, and has a hollow cylindrical shape and a treatment water discharge pipe 25 penetrates through the center thereof in FIG. 3. As shown, the endless filter cloth A is stored in a folded manner several times, and the filter cloth A is pulled down from the upper side, and then surrounds the inner cylinder 21 of the filtering unit 20 to be described. As a material of the said filter cloth A, it can select from the well-known endless filter cloth suitably according to the objective, and can use.

상기 여과부(20)는 여과공정이 진행되는 공간으로서, 다공관으로 이루어진 내통(21) 및 상기 내통(21)이 수용되는 외통(24)을 포함하여 이루어지며, 상기 내통(21)의 주위로는 여과포(A)가 둘러싸게 된다. The filtration unit 20 is a space in which the filtration process proceeds, and includes an inner cylinder 21 formed of a porous tube and an outer cylinder 24 in which the inner cylinder 21 is accommodated, and around the inner cylinder 21. The filter cloth A is surrounded.

여과공정을 설명하면, 먼저 원수유입 펌프(미도시)에 의해 유입되는 원수는 원수 인입구(22)를 통하여 여과부(20) 하부로 유입된다. 이때 상기 원수 인입구(22)는 상기 외통(24)의 외주면에 일정 각도를 가지고 부착됨으로써 유입되는 원수가 외통(24)의 내주면을 따라 돌면서 유입되게 된다. 이러한 싸이클론 원리에 1차적으로 입자 크기가 큰 입자는 하부로 침강하게 되며, 미세한 입자만을 포함한 원수가 상부의 여과공간으로 유입되게 된다. 여과공간에서는 내통(21) 주위를 여과포(A)가 둘러싸고 있기 때문에 외통(24)과 내통(21)의 압력차에 의하여 원수가 여과포(A)를 통과하여 다공관으로 이루어진 내통(21) 내부로 유입되면서 미세 물질이 여과되게 된다. 이어서 여과된 처리수는 내통(21) 상부의 처리수 배출관(25)을 지나 처리수 배출구(23)를 통해 외부로 배출된다.Referring to the filtration process, first, the raw water introduced by the raw water inflow pump (not shown) is introduced into the filtration unit 20 through the raw water inlet 22. At this time, the raw water inlet 22 is attached to the outer circumferential surface of the outer cylinder 24 at a predetermined angle so that the raw water flowing in flows along the inner circumferential surface of the outer cylinder 24. In this cyclone principle, particles having a large particle size are primarily settled downward, and raw water including only fine particles is introduced into the upper filtration space. In the filtration space, since the filter cloth A surrounds the inner cylinder 21, raw water passes through the filter cloth A by the pressure difference between the outer cylinder 24 and the inner cylinder 21, and into the inner cylinder 21 formed of the porous tube. As it enters, fine material is filtered. Subsequently, the filtered treatment water is discharged to the outside through the treatment water outlet 23 through the treatment water discharge pipe 25 in the upper portion of the inner cylinder 21.

본 발명의 일 구현예에 따른 무역세 여과장치에 있어서, 몸체부(30)는 상기 여과포 저장부(10)와 여과부(20)를 지지하는 몸통(40)과, 상기 여과포(A)를 끌어 내리는 감속기(32)와 사용을 마친 폐여과포를 저장하는 저장공간(31)을 포함하여 이루어진다. 상기 몸체부(30)의 최하단에는 오염물질 배출구(33)가 설치되며, 이를 통하여 1차적으로 침강한 입자 크기가 큰 입자 및 기타 이물질이 외부로 배출되게 된다.In the trade tax filtration apparatus according to an embodiment of the present invention, the body portion 30 pulls the body 40 and the filter cloth A, which supports the filter cloth storage unit 10 and the filter unit 20. It comprises a decelerator 32 and a storage space 31 for storing the used waste filter cloth. The pollutant discharge port 33 is installed at the lower end of the body portion 30, through which large particles and other foreign matter having largely settled particles are discharged to the outside.

상기 내통(21)을 둘러싸고 있는 여과포(A)는 일정한 시간이나 미리 설정된 차압에 도달하면 하부의 폐여과포 저장공간(31)에 설치된 감속기(32)에 의하여 아래쪽으로 끌어 내려지며, 여과포 저장부(10)의 미사용 여과포가 연속하여 내통(21)을 둘러싸게 됨으로써 새로운 여과포로 연속적인 여과공정을 수행할 수 있게 된다. 이어서 감속기(32)에 의해 아래로 끌어 내려진 사용을 마친 여과포는 여과포 저장공간(31)에 저장되게 된다. 다만 사용을 마친 여과포를 여과포 저장공간에 저장하는 대신 그대로 절단 폐기하는 것도 가능하다. When the filter cloth A surrounding the inner cylinder 21 reaches a predetermined time or a predetermined differential pressure, the filter cloth A is pulled down by the reducer 32 installed in the waste filter cloth storage space 31 at the lower portion, and the filter cloth storage part 10 As the unused filter cloth of) is continuously surrounded by the inner cylinder 21, it is possible to perform a continuous filtration process with a new filter cloth. Subsequently, the used filter cloth pulled down by the reducer 32 is stored in the filter cloth storage space 31. However, instead of storing the used filter cloth in the filter cloth storage space, it is also possible to cut and discard it as it is.

여과포는 길이 측정기기에 의하여 저장된 길이만큼 다 소모되면 교환을 하게 되며, 이때 상부의 여과포 저장부(10)를 개방하여 여과포를 자르고 하부의 폐여과포 저장공간(31)을 개방하여 폐여과포를 제거한 후 소각 처리하게 된다. 새로운 여과포는 다시 상부의 여과포 저장부(10)에 저장하고 시작부를 하부로 내려 하부의 감속기(32)에 연결된 폐여과포 저장공간(31)에 결합시켜 고정한다.When the filter cloth is exhausted as long as the length stored by the measuring device, the filter cloth is exchanged, and at this time, the filter cloth storage part 10 of the upper part is cut to cut the filter cloth and the waste filter cloth storage space 31 of the lower part is removed to remove the waste filter cloth. It will be incinerated. The new filter cloth is stored in the filter bag storage unit 10 of the upper portion and lowered to the lower portion of the filter bag combined with the waste filter storage space 31 connected to the reducer 32 at the bottom and fixed.

이상과 같이 본 발명에 따른 무역세 여과장치는 엔드리스형의 여과포를 이용하여 연속적인 여과가 가능함으로써 역세 공정이 필요없게 됨으로써, 기존의 장치에 비하여 부수장치의 설치가 필요없고 여과포의 교체 시간도 매우 짧아 경제적인 운전이 가능한 효과가 있다.
As described above, the trade tax filtration device according to the present invention is capable of continuous filtration using an endless filter cloth, thereby eliminating the need for a backwashing process. Short and economical driving effect is possible.

이상에서 본 발명의 바람직한 구현예를 들어 본 발명을 상세하게 설명하였으나 본 발명은 상술한 구현예에 한정되지 않으며, 본 발명의 기술적 사상의 범위 내에서 본 발명이 속하는 기술분야의 당업자에 의해 많은 변형이 가능함은 자명할 것이다.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. This will be obvious.

10 : 여과포 저장부
20 : 여과부
21 : 내통
22 : 원수 인입구
23 : 처리수 배출구
24 : 외통
25 : 처리수 배출관
30 : 몸체부
31 : 폐여과포 저장공간
32 : 감속기
33 : 오염물질 배출구
40 : 몸통
A : 여과포10: filter cloth storage unit
20: filtration unit
21: My heart
22: enemy entrance
23: treated water outlet
24: outer cylinder
25: treated water discharge pipe
30: body
31: waste filter cloth storage space
32: Reducer
33: pollutant outlet
40: torso
A: filter cloth

Claims (4)

여과포를 저장하는 상부의 여과포 저장부;
다공관으로 이루어진 내통 및 상기 내통이 수용되는 외통을 포함하며 상기 여과포에 의해 유입되는 원수를 여과하는 여과부; 및
상기 여과포 저장부와 여과부를 지지하며 하부에는 사용을 마친 폐여과포가 저장되는 저장공간을 가지는 몸체부를 포함하는 무역세 여과장치.
An upper filter cloth storage unit for storing the filter cloth;
A filtration unit including an inner cylinder made of a porous tube and an outer cylinder in which the inner cylinder is accommodated, and filtering raw water introduced by the filter cloth; And
And a body part supporting the filter cloth storage part and the filtration part, and having a body part having a storage space at the bottom of the used waste filtration cloth.
제1항에 있어서, 상기 여과포는 여과포 저장부의 상부에서 아래쪽으로 내려와 상기 여과부의 내통을 둘러싸며, 상기 몸체부에 설치된 감속기에 의해 아래쪽으로 끌어내려지는 것을 특징으로 하는 무역세 여과장치.
The apparatus of claim 1, wherein the filter cloth is lowered from an upper portion of the filter cloth storage portion to surround the inner cylinder of the filter portion, and is pulled downward by a reducer installed in the body portion.
제1항에 있어서, 원수는 원수 인입구를 통하여 상기 여과부의 아래쪽에서 유입되며, 여과된 처리수는 내통 상부의 처리수 배출구를 통하여 배출되는 것을 특징으로 하는 무역세 여과장치.
The apparatus of claim 1, wherein the raw water is introduced from the lower portion of the filtration unit through a raw water inlet, and the filtered treated water is discharged through the treated water outlet in the upper portion of the inner cylinder.
제3항에 있어서, 상기 원수는 싸이클론 방식으로 유입되어 1차적으로 입자 크기가 큰 물질은 하부로 침강하여 배출되는 것을 특징으로 하는 무역세 여과장치.     According to claim 3, wherein the raw water is introduced in a cyclone system trade material filtration device, characterized in that the primary particles of large particle size is settled down and discharged.
KR1020120084877A 2012-08-02 2012-08-02 Filtering apparatus without back wash KR101345261B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101516727B1 (en) * 2014-04-16 2015-05-04 이전웅 No-backwashing filter-ii

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001300593A (en) 2000-04-26 2001-10-30 Nkk Corp Traveling filter cloth type waste liquid treating device
KR100937111B1 (en) 2009-08-27 2010-01-15 주식회사 조은환경 Adjustable filtration
KR101077362B1 (en) 2009-12-09 2011-10-26 주식회사 조은환경 Pore adjustable filtration

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001300593A (en) 2000-04-26 2001-10-30 Nkk Corp Traveling filter cloth type waste liquid treating device
KR100937111B1 (en) 2009-08-27 2010-01-15 주식회사 조은환경 Adjustable filtration
KR101077362B1 (en) 2009-12-09 2011-10-26 주식회사 조은환경 Pore adjustable filtration

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101516727B1 (en) * 2014-04-16 2015-05-04 이전웅 No-backwashing filter-ii

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