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KR101973737B1 - Method for production of sludge dewatering cake in ceramic membrane filtration process using submerged membrane - Google Patents

Method for production of sludge dewatering cake in ceramic membrane filtration process using submerged membrane Download PDF

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KR101973737B1
KR101973737B1 KR1020180130131A KR20180130131A KR101973737B1 KR 101973737 B1 KR101973737 B1 KR 101973737B1 KR 1020180130131 A KR1020180130131 A KR 1020180130131A KR 20180130131 A KR20180130131 A KR 20180130131A KR 101973737 B1 KR101973737 B1 KR 101973737B1
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South Korea
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sludge
tank
treatment water
dewatering
immersion membrane
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KR1020180130131A
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Korean (ko)
Inventor
김지훈
김민진
이경일
김푸름
김병택
최수민
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성균관대학교 산학협력단
지앤씨엔지니어링 주식회사
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/02—Inorganic material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/005—Valves
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/42—Liquid level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/20—Sludge processing

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The present invention relates to a method for generating a sludge dehydration cake by concentrating and dehydrating sludge generated in a floating separation tank (171), which comprises the steps of: (a) introducing raw water into a floating separation tank (171); (b) generating a treated water and sludge by performing the introduced raw water for solid and liquid separation by a floating separation process, and floating the generated sludge; (c) operating a suction filtration pump positioned at a rear end of the floating separation tank (171) to collect the treated water generated in the step (b) in a treated water tank (600); (d) introducing the sludge floated in the step (b) to a sludge immersion membrane filtering unit (971) including a ceramic membrane in an immersion method to be treated with membrane filtration by the ceramic membrane so as to generate an immersion membrane-treated water and a dehydrating sludge; and (e) generating a sludge dehydration cake by introducing and dehydrating the dehydration sludge generated in the step (d) into a dehydrator (800).

Description

침지막을 이용한 부상분리 공정에서의 슬러지 탈수케익 생성 방법{Method for production of sludge dewatering cake in ceramic membrane filtration process using submerged membrane}TECHNICAL FIELD The present invention relates to a method for producing a sludge dewatering cake in a flotation separation process using an immersion membrane,

본 발명은 수처리 기술분야에 관한 것으로, 보다 구체적으로 침지막을 이용하여 부상분리 공정에서 슬러지 탈수케익(cake)을 생성하는 방법에 관한 것이다. The present invention relates to the field of water treatment technology, and more particularly to a method for producing a sludge dewatering cake in a flotation separation process using an immersion membrane.

세라믹막과 유기막에는 많은 차이가 있다. 도 1은 세라믹막의 일종인 SiC 막의 특성과 유기막의 일종인 PVDF의 특성을 비교하는 표이다. 표에서 나타나는 바와 같이, 세라믹막은 유기막에 비하여 허용 pH 및 온도의 범위가 넓다. There are many differences between the ceramic film and the organic film. 1 is a table for comparing the characteristics of a SiC film, which is one type of ceramic film, and the characteristics of PVDF, which is a kind of organic film. As shown in the table, the ceramic film has a wide range of permissible pH and temperature as compared with the organic film.

세라믹막은 친수성이고 역세가 가능하므로 고플럭스로 안정적으로 운전 가능이 가능하고 막표면이 높은 음전하를 띄어 수중에서 음전하를 띄는 박테리아, 조류, MLSS, 미생물생성고분자물질(TEP), 오일 등의 오염 물질 제거가 용이하다는 장점이 있다. 또한, 저농도의 응집제만 주입하더라도 저분자 조류부산물질(Algal-derived Organic Matters, AOM)등 용존유기물(DOC) 제거율을 향상시킬 수 있고 역세시 저농도의 차염소산나트륨을 추가함으로써 바이오파울링의 성장 전 제어 가능하여 막오염을 저감시킬 수 있다. 이러한 장점으로 세라믹막을 이용한 침지식 막여과 공정이 각광받고 있다. Since the ceramic membrane is hydrophilic and can be backwashed, it can be operated stably with high flux and it can remove stains such as bacteria, algae, MLSS, microbial polymer (TEP) and oil which have a negative negative charge on the membrane surface. Is advantageous. In addition, even if only a low concentration of coagulant is injected, the removal rate of dissolved organic matter (DOC) such as Algal-derived Organic Matters (AOM) can be improved, and by adding low concentration of sodium hypochlorite during backwashing, It is possible to reduce the contamination of the membrane. As a result, the immersion membrane filtration process using a ceramic membrane is attracting attention.

한편, 부상분리 공정(DAF, dissolved air floatation system)은, 비중 차이를 이용한 고액분리를 통해 슬러지를 상승시켜 스크래퍼 등을 이용해 걷어내고, 나머지 처리수를 생산하는 공정이다. 도 2를 참조하여 보다 구체적으로 설명한다. On the other hand, the dissolved air floatation system (DAF) is a process in which the sludge is elevated through solid-liquid separation using specific gravity difference and scraped off using a scraper or the like, and the remaining treated water is produced. Will be described in more detail with reference to FIG.

하폐수와 같은 원수는 원수유입펌프(110)에 의해 원수유입밸브(115)를 거쳐 부상분리조(171)에 유입된다. Raw water such as wastewater flows into the floating separation tank 171 through the raw water inflow valve 115 by the raw water inflow pump 110.

부상분리조(171)에서는 하폐수가 비중 차이를 이용해 고액분리가 이루어지며, 슬러지는 승강하고 처리수가 아래에 남는다. 보통, 원수가 유입되는 라인의 반대편 아래에 처리수가 모인다. In the floating separation tank 171, solid-liquid separation is carried out using the specific gravity difference between the wastewater and the sludge is raised and lowered, and the treated water is left below. Normally, the process water collects at the opposite side of the line where the raw water is introduced.

처리수는 별도의 펌프(미도시)를 이용하여 처리수조(600)에 집수된다. 일부는 원수를 희석하기 위하여 처리수 순환부(173)에 저류된 후 원수 유입 라인에 투입되기도 한다. 이를 위한 펌프 등의 구성 요소가 처리수 순환부(173)에 구비되어 있다. The treated water is collected in the treatment water tank 600 by using a separate pump (not shown). Some of them are stored in the treatment water circulating unit 173 for diluting the raw water and then put into the raw water inflow line. And a component such as a pump for this purpose is provided in the treatment water circulating unit 173.

슬러지는 스크래퍼(미도시) 등을 이용하여 부상분리조(171)에 인접한 슬러지집수조(172)로 걷어낸다. 스크래퍼의 동작은 연속적이고 주기적으로 이루어진다. The sludge is removed by a sludge collecting tank 172 adjacent to the floating separation tank 171 using a scraper (not shown) or the like. The operation of the scraper is continuous and periodic.

걷어낸 슬러지는 슬러지 유입펌프(190)에 의해 슬러지 배출 밸브(195)를 지나 농축조(700)에서 농축된다. The withdrawn sludge is condensed in a concentration tank 700 through a sludge discharge valve 195 by a sludge inlet pump 190.

농축조(700)에서 일정 시간이 경과하여 슬러지가 다시 어느 정도 고액분리되면, 탈수용 슬러지 유입펌프(890)의 동작에 의해 대체로 고체인 물질만이 탈수기(800)에 유입되어 탈수되고 슬러지 탈수케익의 형태로 배출된다. 이 과정에서 발생한 탈리액은 당연히 수질이 좋지 않아 다시 이용될 수 없고 농축조(700)에 재유입되어 재농축되는 것이 일반적이다. 농축조(700)에는 고액분리를 위한 오염물질의 침강을 위해 응집제 주입부(750)로부터의 응집제가 주입된다.When the sludge is again solid-liquid separated to a certain extent after a certain period of time in the concentration tank 700, only a substantially solid substance flows into the dehydrator 800 by the operation of the dehydrating sludge inflow pump 890, . The desalination liquid generated in this process is of course poorly water quality and can not be used again, and is generally re-introduced into the concentration tank 700 and re-concentrated. In the concentration tank 700, a flocculant is injected from the flocculant injecting unit 750 for sedimentation of contaminants for solid-liquid separation.

여기서, 하폐수와 같은 원수의 침전물인 슬러지(즉, 부상분리조(171)에서 생성되는 슬러지)는 악취의 폐기 물질이기에, 탈수기(800)에서 탈수 후 케익 형태로 배출하여 별도 매립지에 매립하는 것이 일반적이다. 그런데, 슬러지를 바로 탈수기(800)를 유입시키면, 슬러지 내에 포함되어 있는 많은 유체로 인하여 탈수기(800)의 탈수 효율이 좋지 못하며 부하가 많이 걸려 장비 고장에 이르고 수명을 단축시키게 된다. 따라서, 전술한 바와 같이, 탈수기(800) 전단에 농축조(700)를 장비시켜, 슬러지에서 고액분리로서 액체를 먼저 분리한 후 탈수기(800)에 고체 부분만을 유입시킨다(물론, 여기서 유입되는 고체 부분에도 여전히 다량의 액체가 포함되어 있다). 농축조(700)의 고액분리는 오염물의 침강으로 인한 것이므로, 효율적 분리를 위해 침강을 돕는 응집제가 응집제 주입부(750)로부터 투입된다.Since sludge which is a sediment of raw water such as wastewater (i.e., sludge generated in the floatation separation tank 171) is an odorous waste material, it is generally dehydrated in a dehydrator 800, discharged in the form of a cake, and buried in a landfill to be. However, when the sludge is directly introduced into the dehydrator 800, the dehydration efficiency of the dehydrator 800 is not good due to a lot of fluids contained in the sludge, and the load is increased, resulting in equipment failure and shortening the life span. Accordingly, as described above, the concentration tank 700 is installed at the front end of the dehydrator 800, and the liquid is first separated by solid-liquid separation from the sludge, and then only the solid portion is introduced into the dehydrator 800 (of course, Lt; / RTI > still contains a large amount of liquid). Since the solid-liquid separation of the concentration tank 700 is caused by sedimentation of contaminants, a flocculant for assisting sedimentation is injected from the flocculant injection unit 750 for efficient separation.

여기에 두 가지 문제점이 있다. There are two problems here.

첫째, 응집제 주입부(750)에서 투입되는 응집제는 침강 효율이 높은 고분자 응집제인데, 이는 매우 고가이다. First, the coagulant injected into the coagulant injecting unit 750 is a polymer flocculant having a high sedimentation efficiency, which is very expensive.

둘째, 다량의 슬러지를 일정 기간 저류시켜 고액분리하는 농축조(700)는 그 부피가 상당히 커야 하는 설비라는 점이다. 농축조(700)의 일반적인 크기는 부상분리 공정의 핵심 설비인 부상분리조(171)의 크기에 상응한다. 이로 인해, 농축조(700)를 설치하여야 하는 부지 확보의 문제, 부지가 부상분리조(171)에서 떨어져서 확보된 경우 배관을 연결하고 펌프(190) 동력을 키워야 하는 문제, 큰 부피의 설비 구축 비용의 문제 등이 발생한다. 또한, 농축조(700)는 대부분 상부가 개방되어 있는데, 악취 성분인 슬러지를 저류하고 있기에 악취가 주변으로 발산한다는 문제도 발생한다.Second, the concentrating tank 700 for storing a large amount of sludge for a certain period of time and performing solid-liquid separation is a facility in which the volume of the sludge is considerably large. The general size of the concentration tank 700 corresponds to the size of the floating separation tank 171 which is a core facility of the float separation process. Therefore, there is a problem in securing the site where the concentration tank 700 should be installed, a problem of connecting the piping and increasing the power of the pump 190 when the site is secured away from the floating separation tank 171, Problems occur. In addition, since the upper part of the concentrating tank 700 is mostly open, there is a problem that the odor is emitted to the surroundings because the sludge is stored.

(특허문헌 1) 한국등록특허 10-1807776(Patent Document 1) Korean Patent No. 10-1807776

(특허문헌 2) 한국등록특허 10-1663368(Patent Document 2) Korean Patent No. 10-1663368

(특허문헌 3) 한국공개특허 10-2005-0121306(Patent Document 3) Korean Patent Laid-Open No. 10-2005-0121306

(특허문헌 4) 한국등록특허 10-0414581(Patent Document 4) Korean Patent No. 10-0414581

본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것이다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems.

구체적으로, 응집제를 투입하지 않으면서도 탈수기(800)의 부하를 줄일 수 있는 공정을 제안하고자 한다. 또한, 농축조(700)를 대신할 수 있는 공정으로서 비교적 컴팩트한 공정으로 대체하여 큰 크기의 농축조(700)가 갖는 문제를 해결하고자 한다. Specifically, a process capable of reducing the load of the dehydrator 800 without adding a coagulant is proposed. In addition, as a process that can replace the concentration tank 700, a relatively compact process is substituted for the problem of the large-size concentration tank 700. [

상기와 같은 과제를 해결하기 위한 본 발명의 일 실시예는, 부상분리조(171)에서 생성된 슬러지를 농축 및 탈수하여 슬러지 탈수케익(cake)을 생성하는 방법으로서, (a) 상기 부상분리조(171)에 원수가 유입되는 단계; (b) 상기 유입된 원수가 부상분리 공정에 의해 고액분리되어 처리수와 슬러지가 생성되고, 생성된 슬러지가 부상하는 단계; (c) 상기 부상분리조(171)의 후단에 위치한 흡입용 여과펌프가 동작하여, 상기 (b) 단계에서 생성된 처리수가 처리수조(600)에서 집수되는 단계; (d) 상기 (b) 단계에서 부상한 슬러지가 세라믹막을 침지식으로 포함하는 슬러지 침지막여과부(971)에 유입되어 상기 세라믹막에 의해 막여과 처리됨으로써, 침지막 처리수와 탈수용 슬러지가 생성되는 단계; 및 (e) 상기 (d) 단계에서 생성된 탈수용 슬러지가 탈수기(800)에 유입되어 탈수처리됨으로써 슬러지 탈수케익이 생성되는 단계를 포함하는, 부상분리 공정에서의 슬러지 탈수케익 생성 방법을 제공한다.According to an aspect of the present invention, there is provided a method of producing a sludge dewatering cake by concentrating and dewatering sludge generated in a floatation separation tank (171), the method comprising the steps of: (a) (171); (b) subjecting the introduced raw water to solid-liquid separation by a flotation separation process to produce treated water and sludge, and float the generated sludge; (c) a suction filtration pump located at a rear end of the floating separation tank 171 operates to collect the treated water generated in the step (b) in the treatment water tank 600; (d) The sludge floated in the step (b) flows into the sludge immersion membrane filtration unit 971 containing the ceramic membrane by immersion, and the membrane filtration is performed by the ceramic membrane, whereby the immersion membrane treatment water and the dewatering sludge A generating step; And (e) the dewatering sludge generated in the step (d) is introduced into the dehydrator 800 and dehydrated to produce a sludge dewatering cake, wherein the sludge dewatering cake is generated in a flotation separation process .

또한, 상기 (e) 단계는, (e1) 상기 (d) 단계에서 생성된 탈수용 슬러지의 농축율의 기준 농축율을 만족하는지 여부를 확인하는 단계; 및 (e2) 만족하는 경우, 상기 탈수용 슬러지가 상기 탈수기(800)에 유입되는 단계를 더 포함하는 것이 바람직하다.The step (e) may further include the steps of: (e1) confirming whether the reference concentration of the concentration of the dewatering sludge produced in the step (d) is satisfied; And (e2), the step of introducing the dehydrating sludge into the dehydrator 800 may further comprise the step of:

또한, 상기 (d) 단계 이후, (f1) 상기 (d) 단계에서 생성된 침지막 처리수가 목표처리수질을 만족하는지 여부를 확인하는 단계; 및 (f2) 만족한 경우, 침지막 처리수 유입밸브(615)가 개방되고 다른 흡입용 여과펌프(610)의 동작에 의해, 상기 침지막 처리수가 상기 처리수조(600)에서 집수되는 단계를 더 포함하는 것이 바람직하다.After the step (d), (f1) confirming whether or not the immersion membrane treatment water generated in the step (d) satisfies the target treatment water quality; And the step (f2) is satisfied, the immersion membrane treatment water inlet valve 615 is opened and the immersion membrane treatment water is collected in the treatment water tank 600 by the operation of another suction filtration pump 610 .

또한, 상기 (f1) 단계 이후, (f3) 만족하지 않는 경우, 침지막 처리수 재순환밸브(625)가 개방되고 상기 다른 흡입용 여과펌프(610)의 동작에 의해, 상기 침지막 처리수가 처리수 순환부(173)를 통해 상기 부상분리조(171)에 재순환하는 단계를 더 포함하는 것이 바람직하다.If the immersion membrane treatment water recirculation valve 625 is opened and the operation of the other suction filtration pump 610 is performed when the immersion membrane treatment water is not satisfied after step (f1) And recirculating the purified water to the floating separation tank (171) through the circulation unit (173).

또한, 상기 (d) 단계는, (d1) 상기 (b) 단계에서 부상하여 유입된 슬러지에 의해, 상기 포함하는 슬러지 침지막여과부(971)의 수위가 기준수위 이상인지 여부를 확인하는 단계; 및 (d2) 기준수위 이상인 경우, 상기 슬러지 침지막여과부(971)의 여과 동작이 시작하는 단계를 더 포함하는 것이 바람직하다.The step (d) may further comprise the steps of: (d1) confirming whether the level of the sludge immersion membrane filtration unit 971 is higher than a reference level by the sludge floated in step (b); And (d2) a reference level of the sludge immersion membrane filtration unit (971), the filtration operation of the sludge immersion membrane filtration unit (971) is started.

또한, 상기 부상분리조(171)의 후단에 농축조 및 응집제 주입부가 구비되지 않는 것이 바람직하다.In addition, it is preferable that the concentration tank and the coagulant injection unit are not provided at the rear end of the floating separation tank 171.

본 발명에 따른 방법이 적용되어, 응집제와 농축조를 생략하면서도 탈수기에 부하를 높이지 않고 슬러지 탈수케익 생성이 가능하다. 즉, 고가의 응집제 투입으로 인한 경제적 손실의 문제가 해결되고, 큰 크기의 농축조를 생략하여 부지 확보 및 설비로 인한 초기 투자 비용이 과다한 문제도 해결되며, 악취를 발산하는 혐오 시설도 생략할 수 있다.The method according to the present invention can be applied to produce a sludge dewatering cake without increasing the load on the dehydrator while omitting the flocculant and the thickener. That is, the problem of economic loss due to the input of expensive coagulant is solved, and the large-sized concentration tank is omitted, so that the initial investment cost due to site securing and facilities is solved, and the disgusting facility for emitting odor can be omitted .

이를 위한 추가의 펌프가 필요하지 않다. 펌프를 추가하는 것 역시 제어 방법을 복잡하게 하며, 초기 투자 및 운영시 경제적 손실이 발생시키는데, 본 발명은 탈수기에 슬러지를 유입시키기 위하여 어차피 필요한 펌프, 즉 종래 기술에서도 반드시 구비되었던 펌프 중 하나를 사용하되 다양한 목적으로 사용할 수 있어서 경제적이며 운영이 간단하다.No additional pump is needed for this. The addition of a pump also complicates the control method and causes economic losses in the initial investment and operation. In the present invention, one of the pumps, which is necessarily provided in the prior art, is used in order to introduce the sludge into the dehydrator. It is economical and easy to operate because it can be used for various purposes.

슬러지 탈수케익을 생성하는 과정에서 발생하는 침지막 처리수는 처리수조에 함께 저류될 수 있다. 종래 기술과 비교하면, 동일한 양의 원수를 처리하여도 처리수의 양이 증대되기에, 처리 효율이 우수하다. 예를 들어, 종래에 단위용량 100의 원수를 처리하여 처리수조에 90이 집수되고 10의 슬러지가 배출되었다면, 본 발명은 10의 슬러지 중에서도 2 내지 3의 처리수를 다시 생성시킬 수 있는바, 그만큼 처리 효율이 증대된다. The immersion membrane treatment water generated in the course of producing the sludge dewatering cake can be stored together in the treatment water tank. Compared with the prior art, the amount of treated water is increased even if the same amount of raw water is treated, and therefore, the treatment efficiency is excellent. For example, if the raw water of the unit capacity 100 has been conventionally collected and 90 sludge has been collected in the treated water tank and 10 sludge has been discharged, the present invention can regenerate 2 to 3 treated sludge out of 10 sludge, The processing efficiency is increased.

도 1은 세라믹막과 유기막을 비교하기 위한 표이다.
도 2은 종래 기술에 따른 부상분리 공정의 개념도이다.
도 3은 본 발명에 따른 부상분리 공정의 개념도이다.
도 4는 본 발명에 따른 부상분리 공정을 설명하기 위한 순서도이다.1 is a table for comparing a ceramic film and an organic film.
2 is a conceptual diagram of a flotation separation process according to the prior art.
3 is a conceptual diagram of a flotation separation process according to the present invention.
4 is a flow chart for explaining a flotation separation process according to the present invention.

이하, 도 3을 참조하여 본 발명에 대하여 상세히 설명한다. Hereinafter, the present invention will be described in detail with reference to FIG.

본 발명에 따른 방법은, 농축조(700) 및 응집제 주입부(750)를 생략하여 일종의 직탈수 시스템으로 공정을 구성하는 대신, 슬러지 침지막여과부(971)를 채택한다. 농축조(700) 및 응집제 주입부(750)를 생략하면서도 탈수기(800)에 유입되는 슬러지의 농도가 종래 기술과 유사함은 물론이다. The method according to the present invention adopts the sludge dipping membrane filtration unit 971 instead of the concentrated dewatering tank 700 and the coagulant injection unit 750 and constitutes a process with a direct dewatering system. It goes without saying that the concentration of sludge introduced into the dehydrator 800 is similar to that of the prior art while omitting the thickener 700 and the coagulant injector 750.

부상분리조(171)에서의 여과를 위해, 원수유입펌프(110) 및 원수유입밸브(115)에 의해 부상분리조(171)에 원수가 유입된다. The raw water is introduced into the floating separation tank 171 by the raw water inflow pump 110 and the raw water inflow valve 115 for filtration in the floating separation tank 171. [

부상분리조(171)에 유입된 원수가 부상분리 공정에 의해 고액분리되어 처리수와 슬러지가 생성된다. 슬러지는 부상하기에, 스크래퍼(미도시) 등에 의해 후단의 슬러지 침지막여과부(971)로 유입된다. 처리수는 부상분리조(171) 하부에 있기에, 그 후단에 위치하는 흡입용 여과펌프(미도시)를 이용하여 처리수조(600)에 집수된다. 처리수 일부가 처리수 순환부(173)에 저류된 후 재순환되는 공정은 종래 기술과 동일하다. The raw water flowing into the floating separation tank 171 is subjected to solid-liquid separation by a floating separation process to produce treated water and sludge. The sludge floats and flows into the sludge immersion membrane filtration section 971 at the rear end by a scraper (not shown) or the like. Since the treated water is in the lower part of the floating separation tank 171, it is collected in the treatment water tank 600 using a suction filtration pump (not shown) located at the rear end. The process in which a part of the treated water is stored in the treatment water circulating unit 173 and then recirculated is the same as in the prior art.

슬러지 침지막여과부(971)은 침지식으로 세라믹막을 구성한다. 슬러지 침지막여과부(971)가 막여과 처리를 수행하면, 다시 처리수(이하, '침지막 처리수'로 지칭함)와 슬러지(이하, '탈수용 슬러지'로 지칭함)가 생성된다.The sludge immersion membrane filtration section 971 constitutes a ceramic membrane by immersion. When the sludge immersion membrane filtration section 971 performs the membrane filtration process, the treated water (hereinafter referred to as the immersion membrane treated water) and the sludge (hereinafter referred to as the dewatered sludge) are generated.

탈수용 슬러지는, 부상분리조(171)에서 배출된 슬러지에서 침지막 처리수만큼의 액체가 제거된 것이기에, 응집제를 이용하여 부상분리조(171)로부터의 슬러지를 응집한 것보다 높은 응집 효율을 갖는다. 특히, 고플럭스로 안정적 운전이 가능한 세라믹막을 이용하여 침지막을 구성하였는바, 부상분리조(171)에서 배출된 슬러지가 유입되어도 충분한 여과 성능을 발휘한다. 즉, 농축조(700)에서 일정 시간 고액분리를 시키지 않았고, 응집제를 투입하지 않았음에도, 슬러지 침지막여과부(971)에서는 탈수기(800)에 유입되기에 충분한 농도의 탈수용 슬러지를 배출시킬 수 있다. 실제로, 농축조(700)의 고액분리는 응집제에 의한 이물질 침강을 이용한 것이기에 효율이 높지 않지만, 본 발명에서는 세라믹막에 의한 분리가 이루어지므로 분리 효율이 한층 높음을 실험을 통하여 확인하였다. Since the dewatering sludge is obtained by removing the liquid as much as the number of dipped film treatments from the sludge discharged from the floatation separating tank 171, the dewatering sludge has a higher flocculation efficiency than the flocculated sludge from the floatation separating tank 171 . Particularly, when the immersion membrane is constructed using a ceramic membrane capable of stable operation with a high flux, the sludge discharged from the floating separation tank 171 exhibits sufficient filtration performance. That is, the sludge immersion membrane filtration unit 971 can discharge the dewatering sludge having a concentration sufficient to flow into the dewatering apparatus 800 even though the solid-liquid separation is not performed in the concentration tank 700 for a predetermined time and the coagulant is not supplied . Actually, the solid-liquid separation of the concentration tank 700 is based on sedimentation of a foreign substance by a flocculant, and thus the efficiency is not high. However, in the present invention, the separation efficiency by the ceramic membrane is high.

이와 같은 탈수용 슬러지는 종래 기술과 같이 탈수용 슬러지 유입펌프(890)에 의해 탈수기(800)에 유입되어 탈수 처리됨으로써 슬러지 탈수케익이 생성된다. 이 과정에서 발생하는 탈리액은 침지막 처리수만큼 수질이 좋지는 않지만, 종래 기술에서의 탈리액만큼 수질이 나쁜 것은 아니다. 따라서, 종래 기술에서는 농축조로 재순환되는 것에 불과하였던 것에 대비하여, 본 발명에서의 탈리액은 다시 슬러지 침지막여과부(971)로 유입됨으로써 막여과 처리될 수 있다. 이를 통해 침지막 처리수가 더 생성되므로, 종래 기술 대비 처리 효율이 상승된다.Such a dewatering sludge is introduced into the dewatering device 800 by the dewatering sludge inflow pump 890 as in the prior art, and is dehydrated to produce a sludge dewatering cake. The desorbed liquid generated in this process is not as bad as the quality of the treated water, but is not as bad as the desorbed liquid in the prior art. Therefore, in contrast to the prior art that is only recirculated to the thickener, the desorbing liquid in the present invention can be subjected to membrane filtration treatment by being introduced into the sludge immersion membrane filtration section 971 again. As a result, the immersion film treatment water is further generated, so that the treatment efficiency is improved compared to the prior art.

또한, 도 2에 도시된 종래 기술과 비교하면, 종래 기술에서는 슬러지가 탈수기로 유입되기까지, 슬러지 유입펌프(190)와 탈수용 슬러지 유입펌프(890)의 2개의 펌프가 필요하였으나, 본 발명에서는 오직 탈수용 슬러지 유입펌프(890)의 1개의 펌프만 사용한다. 슬러지 유입펌프(190)는 점성이 높고 이물질이 많은 슬러지를 이송하기에 용량이 크고 고가이며 운용 비용이 높은데, 이를 생략하여 경제성이 증진된다. In comparison with the prior art shown in FIG. 2, in the prior art, two pumps, namely, the sludge inflow pump 190 and the dewatering sludge inflow pump 890, are required until the sludge is introduced into the dehydrator. Only one pump of the dewatering sludge inlet pump 890 is used. The sludge inflow pump 190 has a high viscosity and high capacity to transport sludge having a large amount of foreign matter, and the operation cost is high.

또한, 농축조(700)에서 고체를 분리하고 남은 액체 부분은 당연히 재사용이 어려울 정도로 수질이 좋지 않지만, 슬러지 침지막여과부(900)에서 세라믹막에 의해 분리된 액체 부분인 침지막 처리수는 세라믹막의 특성으로 인해 처리수만큼 수질이 양호하다. The immersion membrane treatment water, which is the liquid portion separated by the ceramic membrane in the sludge immersion membrane filtration unit 900, is a water solution of the ceramic membrane, which is a liquid part separated by the ceramic membrane, Due to the characteristics, the water quality is good as the number of treatments.

따라서, 수질이 양호한 침지막 처리수는 침지막 처리수 유입밸브(615)를 통해 처리수조(600)에서 집수될 수 있으며, 또는 그 수질 정도에 따라 침지막 처리수 재순환밸브(625)를 통해 부상분리조(171)로 재순환할 수도 있다. 이와 같은 침지막 처리수의 상이한 이송은 모두 흡입용 여과펌프(610) 1개의 펌프 동작으로 구현된다. Therefore, the immersion membrane treatment water having a good water quality can be collected in the treatment water tank 600 through the immersion membrane treatment water inlet valve 615, or can be floated through the immersion membrane treatment water recirculation valve 625 depending on the water quality. And may be recycled to the separation tank 171. The different feedings of the immersion membrane treatment water are all realized by one pump operation of the suction filtration pump 610.

도 4를 참조하여, 본 발명에 따른 방법을 단계별로 다시 설명한다. Referring to Figure 4, the method according to the present invention will be described again step by step.

부상분리조(171)에서 처리수와 슬러지가 생성되었고, 처리수는 처리수조(600)로 이송되고, 슬러지는 슬러지 침지막여과부(971)로 이송되는 상태이다. Treated water and sludge are generated in the floating separation tank 171, the treated water is transferred to the treated water tank 600, and the sludge is transferred to the sludge immersion membrane filtration unit 971.

먼저, 슬러지 침지막여과부(971)의 수위를 확인한다(S100). 침지막이 작동되기에 충분한 수위, 즉 부상분리조(171)에서부터 충분한 양의 슬러지가 이송된 경우, 비로서 슬러지 침지막여과부(971)의 동작이 시작되어 막여과 처리를 시작한다(S200). First, the level of the sludge immersion membrane filtration unit 971 is checked (S100). When a sufficient amount of sludge has been transferred from the floatation separation tank 171 at a sufficient level to operate the immersion membrane, the operation of the sludge immersion membrane filtration unit 971 starts to start the membrane filtration process (S200).

막여과 처리사 시작되면, 침지막 처리수와 탈수용 슬러지가 생성된다. When the membrane filtration treatment is started, immersion membrane treatment water and dewatering sludge are produced.

탈수용 슬러지가 농축율을 만족하는지 여부를 확인한다(S240). 예를 들어, 부유물질(SS, suspended solids)를 측정하여, 2%인지 여부를 확인하는 방법 등의 사용이 가능하다. 만족하지 못하는 경우라면, 탈수용 슬러지가 탈수기(800)에 유입될 만큼 충분히 유체를 제거하지 못한 것이므로, S100 단계로 회귀하여 침지막 처리가 계속된다. 탈수용 슬러지가 농축율을 만족하는 경우, 이는 탈수용 슬러지가 탈수기(800)에 유입된 만큼 충분히 농축된 것을 의미하므로, 슬러지 침지막여과부(971)의 막여과 처리를 중지하고, 슬러지 배출 밸브(195)를 개방하고(S241), 탈수기(800)가 작동하기 시작한다(S242). It is checked whether the dewatering sludge satisfies the concentration ratio (S240). For example, it is possible to use a method of measuring the suspended solids (SS) to determine whether or not it is 2%. If it is not satisfied, the dewatering sludge has not sufficiently removed the fluid enough to flow into the dehydrator 800, so the process returns to the step S100 to continue the dewatering membrane treatment. When the dewatering sludge satisfies the concentration ratio, it means that the dewatering sludge is sufficiently concentrated as it flows into the dehydrator 800, so the membrane filtration treatment of the sludge dwelling membrane filtration unit 971 is stopped, (S241), and the dehydrator 800 starts to operate (S242).

이와 동시에, 별도로, 침지막 처리수가 목표처리수질을 만족하는지 여부를 확인한다(S250). 만족하는 경우 처리수조(600)에 함께 집수될 수 있음을 의미하는바, 침지막 처리수 유입밸브(615)를 개방하여 침지막 처리수를 처리수조(600)에 이송시킨다. 침지막 처리수가 목표처리수질을 만족하지 못하는 경우, 처리수조(600)에 이송시켜서는 안되지만 상당량의 슬러지가 제거된 어느 정도는 여과된 처리수가 되었음을 의미하는바, 이를 원수와 합지시켜 다시 부상분리조(171)에서 다시 처리하도록 처리수 순환부(173)에 이송시키는 것이 바람직하다. 따라서, 침지막 처리수 재순환밸브(625)가 개방되어 침지막 처리수가 처리수 순환부(173)에 이송된다. At the same time, separately, it is confirmed whether or not the immersion membrane treatment water satisfies the target treatment water quality (S250). The immersion membrane treatment water inlet valve 615 is opened to convey the immersion membrane treatment water to the treatment water tank 600. [ When the immersion membrane treatment water does not satisfy the target treatment water quality, it means that the treated water is filtered, to some extent, a considerable amount of sludge has been removed although it should not be transported to the treatment water tank 600, 171 to the processing-water circulating unit 173 again. Therefore, the immersion membrane treatment water recirculation valve 625 is opened, and the immersion membrane treatment water is transferred to the treatment water circulation section 173. [

이상, 본 명세서에는 본 발명을 당업자가 용이하게 이해하고 재현할 수 있도록 도면에 도시한 실시예를 참고로 설명되었으나 이는 예시적인 것에 불과하며, 당업자라면 본 발명의 실시예로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 것이다. 따라서 본 발명의 보호범위는 특허청구범위에 의해서 정해져야 할 것이다.While the present invention has been described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. It will be appreciated that embodiments are possible. Accordingly, the scope of protection of the present invention should be determined by the claims.

110: 원수유입펌프
115: 원수유입밸브
171: 부상분리조
172: 슬러지집수조
173: 처리수 순환부
190: 슬러지 유입펌프
195: 슬러지 배출 밸브
610: 흡입용 여과펌프
615: 침지막 처리수 유입밸브
625: 침지막 처리수 재순환밸브
635: 침지막 처리수 원수유입밸브
700: 농축조
750: 응집제 주입부
800: 탈수기
890: 탈수용 슬러지 유입펌프
971: 슬러지 침지막여과부110: raw water inflow pump
115: raw water inlet valve
171: Float separation tank
172: Sludge sump tank
173: Treated water circulation unit
190: Sludge inflow pump
195: Sludge discharge valve
610: Suction filtration pump
615: immersion membrane treatment water inlet valve
625: immersion membrane treated water recirculation valve
635: Submerged membrane treatment water inlet valve
700: Enrichment tank
750: coagulant injection unit
800: Dehydrator
890: Dewatering sludge inlet pump
971: Sludge immersion membrane filtration section

Claims (6)

부상분리조(171)에서 생성된 슬러지를 농축 및 탈수하여 슬러지 탈수케익(cake)을 생성하는 방법으로서,
(a) 상기 부상분리조(171)에 원수가 유입되는 단계;
(b) 상기 유입된 원수가 부상분리 공정에 의해 고액분리되어 처리수와 슬러지가 생성되고, 생성된 슬러지가 부상하는 단계;
(c) 상기 부상분리조(171)의 후단에 위치한 흡입용 여과펌프가 동작하여, 상기 (b) 단계에서 생성된 처리수가 처리수조(600)에서 집수되는 단계;
(d) 상기 (b) 단계에서 부상한 슬러지가 세라믹막을 침지식으로 포함하는 슬러지 침지막여과부(971)에 유입되어 상기 세라믹막에 의해 막여과 처리됨으로써, 침지막 처리수와 탈수용 슬러지가 생성되는 단계; 및
(e) 상기 (d) 단계에서 생성된 탈수용 슬러지가 탈수기(800)에 유입되어 탈수처리됨으로써 슬러지 탈수케익이 생성되는 단계를 포함하며,
상기 (d) 단계 이후,
(f1) 상기 (d) 단계에서 생성된 침지막 처리수가 목표처리수질을 만족하는지 여부를 확인하는 단계;
(f2) 만족한 경우, 침지막 처리수 유입밸브(615)가 개방되고 다른 흡입용 여과펌프(610)의 동작에 의해, 상기 침지막 처리수가 상기 처리수조(600)에서 집수되는 단계를 더 포함하며,
상기 (f1) 단계 이후,
(f3) 만족하지 않는 경우, 침지막 처리수 재순환밸브(625)가 개방되고 상기 다른 흡입용 여과펌프(610)의 동작에 의해, 상기 침지막 처리수가 처리수 순환부(173)를 통해 상기 부상분리조(171)에 재순환하는 단계를 더 포함하는,
부상분리 공정에서의 슬러지 탈수케익 생성 방법.
A method for producing a sludge dewatering cake by concentrating and dewatering sludge produced in a floating separation tank (171)
(a) introducing raw water into the floating separation tank (171);
(b) subjecting the introduced raw water to solid-liquid separation by a flotation separation process to produce treated water and sludge, and float the generated sludge;
(c) a suction filtration pump located at a rear end of the floating separation tank 171 operates to collect the treated water generated in the step (b) in the treatment water tank 600;
(d) The sludge floated in the step (b) flows into the sludge immersion membrane filtration unit 971 containing the ceramic membrane by immersion, and the membrane filtration is performed by the ceramic membrane, whereby the immersion membrane treatment water and the dewatering sludge A generating step; And
(e) the dewatering sludge generated in the step (d) is introduced into the dehydrator 800 and dehydrated to produce a sludge dewatering cake,
After the step (d)
(f1) confirming whether or not the immersion membrane treatment water generated in the step (d) satisfies the target treatment water quality;
(f2) is satisfied, the immersion membrane treatment water inlet valve 615 is opened and the immersion membrane treatment water is collected in the treatment water tank 600 by the operation of another suction filtration pump 610 In addition,
After the step (f1)
(f3) is not satisfied, the immersion membrane treatment water recycling valve (625) is opened and the operation of the other suction filtration pump (610) causes the immersion membrane treatment water to pass through the treatment water circulation part (173) Further comprising the step of recirculating to the separating tank (171)
A method for producing a sludge dewatering cake in a float separation process.
제 1 항에 있어서,
상기 (e) 단계는,
(e1) 상기 (d) 단계에서 생성된 탈수용 슬러지의 농축율의 기준 농축율을 만족하는지 여부를 확인하는 단계; 및
(e2) 만족하는 경우, 상기 탈수용 슬러지가 상기 탈수기(800)에 유입되는 단계를 더 포함하는,
부상분리 공정에서의 슬러지 탈수케익 생성 방법.
The method according to claim 1,
The step (e)
(e1) confirming whether the reference concentration ratio of the concentration of the dewatering sludge generated in the step (d) is satisfied; And
further comprising the step of introducing said dewatering sludge into said dehydrator (800)
A method for producing a sludge dewatering cake in a float separation process.
삭제delete 삭제delete 제 1 항에 있어서,
상기 (d) 단계는,
(d1) 상기 (b) 단계에서 부상하여 유입된 슬러지에 의해, 상기 포함하는 슬러지 침지막여과부(971)의 수위가 기준수위 이상인지 여부를 확인하는 단계; 및
(d2) 기준수위 이상인 경우, 상기 슬러지 침지막여과부(971)의 여과 동작이 시작하는 단계를 더 포함하는,
부상분리조에서의 슬러지 탈수케익 생성 방법.
The method according to claim 1,
The step (d)
(d1) confirming whether the level of the sludge immersion membrane filtration unit (971) is higher than a reference level by the sludge floated in step (b); And
further comprising the step of starting the filtration operation of the sludge immersion membrane filtration unit (971)
A Method for Producing Sludge Dewatering Cake in Floating Separator.
제 1 항에 있어서,
상기 부상분리조(171)의 후단에 농축조 및 응집제 주입부가 구비되지 않는,
부상분리조에서의 슬러지 탈수케익 생성 방법.The method according to claim 1,
The floatation tank and the flocculant injection unit are not provided at the rear end of the floating separation tank 171,
A Method for Producing Sludge Dewatering Cake in Floating Separator.
KR1020180130131A 2018-10-29 2018-10-29 Method for production of sludge dewatering cake in ceramic membrane filtration process using submerged membrane KR101973737B1 (en)

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KR102221616B1 (en) 2020-11-13 2021-02-26 김영삼 The more economical and efficient sludge dehydrator
KR20230067839A (en) 2021-11-10 2023-05-17 주식회사 아쿠아웍스 Composite solid-liquid separation system based on pressurized floating base

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KR102221616B1 (en) 2020-11-13 2021-02-26 김영삼 The more economical and efficient sludge dehydrator
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