WO2014078269A1 - Procédé pour éliminer des particules en suspension au moyen d'un filtre à disques alimenté par gravité - Google Patents

Procédé pour éliminer des particules en suspension au moyen d'un filtre à disques alimenté par gravité Download PDF

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Publication number
WO2014078269A1
WO2014078269A1 PCT/US2013/069570 US2013069570W WO2014078269A1 WO 2014078269 A1 WO2014078269 A1 WO 2014078269A1 US 2013069570 W US2013069570 W US 2013069570W WO 2014078269 A1 WO2014078269 A1 WO 2014078269A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
water
woven
filter media
wastewater
Prior art date
Application number
PCT/US2013/069570
Other languages
English (en)
Inventor
Herve Buisson
Rune STRUBE
Original Assignee
Veolia Water Solutions & Technologies Support
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Veolia Water Solutions & Technologies Support filed Critical Veolia Water Solutions & Technologies Support
Publication of WO2014078269A1 publication Critical patent/WO2014078269A1/fr

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Classifications

    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
    • 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
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/08—Nanoparticles or nanotubes

Definitions

  • the present invention relates to rotary filter discs for treating water or wastewater, and more particularly to a system and method for filtering water in which the filtration operates by gravity and employs filters having a nominal cut-off between 0.5 and 8 micrometers.
  • Rotary disc filters are widely known and used to remove suspended solids. Often, rotary disc filters are used in polishing operations. For example, rotary disc filters are used to remove suspended solids from the effluent produced by secondary treatment of wastewater systems. These rotary disc filters typically remove suspended solids 10 ⁇ or larger, using filter materials with a nominal cut-off of 10 microns and above.
  • Water or wastewater having suspended particles of 1 micron and larger is treated such that the particles 1 micron and larger are removed.
  • the water is directed to a rotary disc filter having one or more rotatable filter discs.
  • the rotatable filters are at least partially contained within a tank.
  • Filter media are employed on each side of the rotatable filter disc.
  • the filter media include openings that are sized to prevent 95% or more of particles that are 1 micron and larger from passing through the filter media.
  • After a water head pressure is established, that head pressure is used to force water through the filter media.
  • 95% or more of particles sized 1 micron and larger are filtered from the water.
  • the filter media is cleaned by rotating the filter discs holding the filtered media and removing filtered particles therefrom.
  • Cryptosporidium and giardia are removed from drinking water. These contaminants are removed via a method of filtering the drinking water with a rotary disc filter.
  • water containing Cryptosporidium and giardia is directed to a rotary disc filter.
  • the rotary disc filter has at least one rotatable filter disc.
  • the rotatable filter disc is at least partially contained within a tank or basin.
  • Filter media is employed on each side of the rotatable filter disc.
  • the filter media includes openings that permit the water to flow through the filter media. The openings, however, are sized to reject 1 log or more of the Cryptosporidium and giardia in the water.
  • After a water head pressure is established at least 1 log of the Cryptosporidium and giardia are removed by utilizing the head pressure to force the water through the filter media.
  • the filter media filters the water such that 1 log or more of
  • Cryptosporidium and giardia are removed from the water.
  • the filter media is cleaned by rotating the rotatable filter disc(s) and removing filtered Cryptosporidium and giardia from the filtered media.
  • Figure 1 is a perspective view of an exemplary disc filter with portions of the structure broken away to better illustrate basic components of the disc filter.
  • Figure 1 A is a schematic illustration of an end view of the disc filter showing the backwash pump and the drive system for driving the drum and filter disc.
  • the current invention is directed towards methods of removing suspended particles sized 1.0 ⁇ or larger from water and wastewater. These methods utilize a rotary disc filter.
  • Rotary disc filters are known and widely used to remove large particles.
  • Rotary disc filters are shown and described in patents and other published materials. For example, reference is made to U.S. Patent No. 7,597,805 and U.S. Patent Publication No. 2008/0035584. The disclosures of these two publications are expressly incorporated herein by reference. A complete and unified understanding of disc filters, their structure, and operation can be gained by reviewing these materials.
  • FIG. 1 shows a disc filter indicated generally by the numeral 10.
  • Disc filter 10 includes an outer housing 12. Rotatively mounted in the housing 12 is a drum. Generally, the drum is enclosed, except that it includes an inlet opening and a series of openings formed in the surface thereof for enabling influent to flow from the drum into a series of rotary filter disc, indicated generally by the numeral 14, mounted on the drum. That is, as will be appreciated from subsequent discussions herein, influent is directed into the drum, and from the drum through openings in the surface thereof into the respective rotary filter discs 14.
  • each rotary filter disc 14 includes a filter frame 16 and filter media 18 secure on opposite sides of each rotary filter disc 14.
  • a holding area, formed by compartments, is defined inside each rotary filter disc 14 for receiving influent to be filtered by the rotary filter disc 14.
  • the disc filter 10 is provided with a drive system for rotatively driving the drum and the rotary filter discs 14 mounted thereon.
  • a drum motor 64 that is operative to drive a sprocket or sheave (not shown) connected to the drum.
  • Various means can be operatively interconnected between the drum motor 64 and the sprocket for driving the sprocket, and hence the drum.
  • a belt drive can be utilized.
  • Various other types of drive systems can be utilized to rotate the drum and the rotary filter discs 14 mounted thereon.
  • the disc filter 10 includes an influent inlet 22.
  • Influent inlet 22 leads to an influent holding tank 24.
  • Influent holding tank 24 is disposed adjacent an inlet opening formed in the drum such that influent held within the influent holding tank 24 can flow from the holding tank into the drum.
  • the influent holding tank is disposed on the upstream side of the disc filter 10.
  • An outlet 32 enables influent to flow from the bypass tank 30.
  • the influent holding tank 24 includes overflow openings. These overflow openings permit influent overflow to flow from the influent holding tank 24 downwardly into the bypass tank 30. This effectively limits the water level height in the influent holding tank 24.
  • Disc filter 10 also includes an effluent holding tank or basin 26.
  • Effluent holding tank 26 is disposed about a downstream end portion of the disc filter 10, and as shown in the drawings, extends around at least a lower portion of the rotary filter discs 14. As the influent moves outwardly through the filter media 18, this results in the water being filtered, and it follows that the filtered water constitutes an effluent. It is this effluent that is held within the effluent holding tank or basin 26.
  • an effluent outlet associated with the effluent holding tank 26 for directing effluent or filtered water from the disc filter 10.
  • influent water to be treated or filtered is directed into the influent inlet 22 and into the influent holding tank 24 where the water accumulates to a selected height therein so as to provide a head pressure for effectively causing the water to move from the inner portions of the rotary filter discs 14 outwardly through the filter media 18.
  • Influent held within the holding tank 24 eventually is directed into the drum, and from the drum through openings therein into the interior areas of the rotary filter discs 14. Now, the water within the rotary filter disc moves outwardly through the filter media 18 into the effluent holding tank 26, and eventually out the effluent outlet.
  • Disc filter 10 also includes a backwashing system for periodically cleaning the filter media 18.
  • the backwashing system includes a manifold 40 that extends along a side of the disc filter 10 and is operatively connected to a backwash pump 42 ( Figure 1 A) that is operative to direct high pressure wash water through the manifold 40.
  • a backwash pump 42 Figure 1 A
  • Extending off the manifold 40 are a series of feed pipes 44 with each feed pipe being connected at its outer end to a nozzle array 46.
  • a sludge or backwash water outlet 50 is operatively connected to a trough or a catch structure that extends through the drum and is disposed generally underneath the various nozzle arrays 46.
  • the drum can be continuously or intermittently rotated such that the filter media or filter panels 18 enter the accumulated effluent in the effluent holding tank 26. It is appreciated that only a bottom portion of the filter media 18 is effective at any one time to filter the influent. From time-to-time the drum and rotary filter discs will be rotated, and when this occurs some portions of the filter media 18 will be rotated to an upper portion and in this position the filter media 18 will not be in a position to filter the effluent.
  • Filter disc 14 includes filter media 18.
  • Filter media 18 actively filters the feedwater passing through filter disc 14 by preventing suspended particles from passing through filter disc 14.
  • Filter media 18, in a preferred embodiment, has an effective thickness in the range of 100-1300 ⁇ , and preferably less than 400 ⁇ , and is configured such that it rejects at least 95% of particles sized 1 ⁇ and larger.
  • Filter media 18 includes a non-woven filter material.
  • the non-woven filter material may be comprised of homogeneous or heterogeneous fibers.
  • the non- woven filter material is a homogeneous non-woven material.
  • the fibers comprising the non- woven filter material may be of various materials. Examples of materials that may comprise the fibers include, but are not limited to, polyolefins, polyesters, nylons, thermoplastic, fluorinated polymers (PVDF, ECTFE), polysulfones, urethanes, natural polymers such as cellulosics and cellulosic derivatives, and combinations thereof.
  • a substantial portion of the fibers comprising the non-woven filter media have a diameter between 0.5 ⁇ and 8.0 ⁇ . Fibers of larger diameter, however, may be incorporated. In another embodiment, a majority of fibers comprising the non-woven filter media have a diameter between 0.5 ⁇ and 8.0 ⁇ .
  • the fibers comprising the non-woven filter material may be secured together by conventional means.
  • Such means for securing the fibers are well known in the art and include, but are not limited to, ultrasonic pattern bonding, gluing and chemical bonding, thermal bonding, hydroentangling, and meltblown bonding.
  • the fibers are integrated in such a way as to prevent passage of particles sized 1 ⁇ or larger.
  • the fibers are further arranged such that the non-woven filter material has a nominal pore size of 1-8 ⁇ .
  • the open area of the non-woven filter material is approximately 5-12% of the total surface area of non-woven filter material.
  • the pores are not conventional in the sense that they do not define a straight or orderly passageway.
  • the filtrate follows many convoluted, unaligned pathways through the filter media.
  • filter media 18 is a composite filter media.
  • the non-woven filter material is comprised of nanofibers.
  • the nanofibers may have a diameter between 0.1 ⁇ to 1.0 ⁇ .
  • filter media 18 further includes a backing.
  • Backing may be comprised of woven or non-woven fabric. Backing is positioned such that it provides mechanical strength to non-woven filter material. Backing may be positioned on one or both sides of non-woven filter material. In some embodiments, backing is physically attached to the non-woven filter material.
  • the above described disc filter 10 may be used remove suspended particles sized 1.0 ⁇ or larger from water or wastewater.
  • the disc filter 10 includes at least one filter disc 14 that is at least partially contained within a tank or basin.
  • In the “inside-out” version water is directed into a drum, and then flow out from the drum and through the filter media.
  • the water flows through the filter media into the compartment in the drum.
  • Filter media 18 is employed on each side of rotatable filter disc 14. As discussed above, filter media 18 includes openings that are sized to prevent the passage of at least 95% of particles that are 1 ⁇ or larger. To remove at least 95% of the particles sized 1 ⁇ or larger from the water, the water is directed through the filter media 18. To do so, a water or wastewater head pressure sufficient to force water through filter media 18 is developed. The head pressure is then used to force water or waste water through filter media 18. The contaminants that are filtered from the water are then removed by the backwash cleaning system. In some embodiments, to remove the contaminants, filter disc 14 is rotated such that the backwash system may clean filter disc 14 in segments.
  • Cryptosporidium and giardia are protozoan parasites. Humans who are infected with these parasites may become victims of intestinal conditions that may result in stomach pain, fever, diarrhea, nausea, and vomiting. Cryptosporidium and giardia are commonly found in untreated water. Due to the substantial health concerns related to these parasites, it is important to remove such parasites from water treated for drinking as well as treated industrial wastewater that may be discharged into the environment. Because
  • Cryptosporidium is also resistant to a number of common disinfectants, to include chlorine- based disinfectants that are used in some water treatment processes, a filtering method for removing these parasites is needed. It has been observed that the disc filter 10 described herein with non-woven filter material that removes 95% of particles sized 1.0 ⁇ or larger is capable of removing at least 1 log of Cryptosporidium and giardia present in water.
  • the rotary disc filter 10 has at least one rotatable filter disc 14 that is contained in a tank or basin.
  • Filter media 18 is employed on each side of the filter disc 14 and contains openings that permit the water to flow through the filter media 18. The openings are sized such that 1 log or more of the Cryptosporidium and giardia are rejected by filter media 18.
  • a water head pressure is established in the rotary disc filter 10.
  • the head pressure is used to force the water through filter media 18 located on both sides of rotatable filter disc 14.
  • the filtered Cryptosporidium and giardia are cleaned from the filter media.
  • the filter media 18 is cleaned by rotating the filter disc 14 such that the backwash cleaning system is able to clean each segment of filter disc 14.
  • the method of the present invention includes filtering
  • the non-woven fibers make up the non-woven filter media.
  • the method entails capturing or collecting the Cryptosporidium and giardia on the homogeneous non-woven fibers that make up the non-woven filter media.
  • the present invention entails filtering Cryptosporidium and giardia from the water by forcing the water due to the head pressure in the disc filter through non-woven fibers where the non-woven fibers make up the non-woven filter media and have a diameter of approximately 0.5 ⁇ and 8.0 ⁇ .
  • the method entails utilizing a disc filter to filter Cryptosporidium and giardia from the water by forcing the water through non-woven fibers that form the non-woven filter media and wherein the non-woven fibers form pores in the filter media that have a nominal pore size of approximately 1-8 ⁇ .
  • the method entails utilizing a rotary disc filter to filter Cryptosporidium and giardia from water by forcing the water with the Cryptosporidium and giardia therein through non-woven nanofibers that have a diameter of approximately 0.1 ⁇ and 1.0 ⁇ , and collecting the Cryptosporidium and giardia on the non-woven nanofibers.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)
  • Filtering Materials (AREA)

Abstract

L'invention concerne un procédé de traitement de l'eau, dans lequel des matières solides en suspension présentant une taille supérieure ou égale à 1 micron sont éliminées. Le procédé peut également être appliqué en vue d'éliminer les parasites Cryptosporidium et Giardia d'une eau de boisson, l'élimination de particules en suspension et des parasites Cryptosporidium et Giardia étant mise en oeuvre au moyen d'un filtre à disques rotatifs. Dans le procédé décrit, le filtre rotatif comprend un ou plusieurs filtre(s) à disques, le filtre à disques incluant un milieu de filtration non tissé qui est conçu pour éliminer les particules en suspension de taille supérieure ou égale à 1 micron, ou les parasites Cryptosporidium et Giardia, au moyen d'une pression de refoulement qui force l'eau ou les eaux usées traitée(s) à traverser le milieu de filtration non tissé.
PCT/US2013/069570 2012-11-14 2013-11-12 Procédé pour éliminer des particules en suspension au moyen d'un filtre à disques alimenté par gravité WO2014078269A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201261726218P 2012-11-14 2012-11-14
US61/726,218 2012-11-14

Publications (1)

Publication Number Publication Date
WO2014078269A1 true WO2014078269A1 (fr) 2014-05-22

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107115706A (zh) * 2017-06-15 2017-09-01 天津理工大学 一种旋流式污水过滤装置
WO2018060809A1 (fr) * 2016-09-28 2018-04-05 Veolia Water Solutions & Technologies Support Filtre à disque de type cadre avec commande d'eau de dérivation pour empêcher l'eau de dérivation d'être utilisée dans un rétrolavage
CN110038332A (zh) * 2019-05-19 2019-07-23 贾新奎 一种污水处理设备
CN110124376A (zh) * 2019-05-19 2019-08-16 贾新奎 一种污水过滤设备
AT16600U1 (de) * 2018-03-19 2020-02-15 Voith Patent Gmbh Scheibenfilter
CN111389080A (zh) * 2020-03-31 2020-07-10 杨辉云 一种风能自动打捞杂质的污水处理装置
CN112973242A (zh) * 2021-02-05 2021-06-18 陈吉辉 一种纺织污水处理装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020139746A1 (en) * 1998-08-27 2002-10-03 Evan E. Koslow Composite filter medium and fluid filters containing same
EP1872843A1 (fr) * 2006-06-26 2008-01-02 Hydrotech Veolia Water Systems Aktiebolag Cadre pour un filtre à disques
US20080035584A1 (en) 2006-08-14 2008-02-14 Siemens Water Technologies Corp. High flow disc filter
US7597805B2 (en) 2003-02-27 2009-10-06 Hydrotech Veolia Water Systems Aktiebolag Rotary disc filter and module for constructing same
KR100972580B1 (ko) * 2009-09-23 2010-07-28 충남대학교산학협력단 회전가능한 여과 모듈을 이용한 수처리 장치 및 방법
WO2010107503A1 (fr) * 2009-03-19 2010-09-23 Millipore Corporation Élimination de micro-organismes dans des échantillons de fluide en utilisant des milieux de filtration à nanofibres
US20120241391A1 (en) * 2011-03-25 2012-09-27 Receptors Llc Filtration article with microbial removal, micro-biocidal, or static growth capability

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020139746A1 (en) * 1998-08-27 2002-10-03 Evan E. Koslow Composite filter medium and fluid filters containing same
US7597805B2 (en) 2003-02-27 2009-10-06 Hydrotech Veolia Water Systems Aktiebolag Rotary disc filter and module for constructing same
EP1872843A1 (fr) * 2006-06-26 2008-01-02 Hydrotech Veolia Water Systems Aktiebolag Cadre pour un filtre à disques
US20080035584A1 (en) 2006-08-14 2008-02-14 Siemens Water Technologies Corp. High flow disc filter
WO2008021270A2 (fr) * 2006-08-14 2008-02-21 Siemens Water Technologies Corp. Filtre en forme de disque à débit élevé
WO2010107503A1 (fr) * 2009-03-19 2010-09-23 Millipore Corporation Élimination de micro-organismes dans des échantillons de fluide en utilisant des milieux de filtration à nanofibres
KR100972580B1 (ko) * 2009-09-23 2010-07-28 충남대학교산학협력단 회전가능한 여과 모듈을 이용한 수처리 장치 및 방법
US20120241391A1 (en) * 2011-03-25 2012-09-27 Receptors Llc Filtration article with microbial removal, micro-biocidal, or static growth capability

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2720249C1 (ru) * 2016-09-28 2020-04-28 Веолия Уотер Сольюшнз Энд Текнолоджиз Сеппорт Рамный дисковый фильтр с контролем байпасной воды для предотвращения применения байпасной воды в обратной промывке
US10589201B2 (en) 2016-09-28 2020-03-17 Veolia Water Solutions & Technologies Support Frame-type disc filter with bypass water control for preventing bypass water from being used in backwashing
KR20190050845A (ko) * 2016-09-28 2019-05-13 베올리아 워터 솔루션즈 앤드 테크놀러지스 써포트 우회수가 역세척에 사용되는 것을 방지하기 위한 우회수 제어 기능이 있는 프레임형 디스크 필터
CN109789347A (zh) * 2016-09-28 2019-05-21 威立雅水务技术支持公司 具有用于防止旁路水用于反洗的旁路水控制的框架型盘式过滤器
KR102244809B1 (ko) 2016-09-28 2021-04-28 베올리아 워터 솔루션즈 앤드 테크놀러지스 써포트 우회수가 역세척에 사용되는 것을 방지하기 위한 우회수 제어 기능이 있는 프레임형 디스크 필터
AU2017336616B2 (en) * 2016-09-28 2020-09-10 Veolia Water Solutions & Technologies Support Frame-type disc filter with bypass water control for preventing bypass water from being used in backwashing
WO2018060809A1 (fr) * 2016-09-28 2018-04-05 Veolia Water Solutions & Technologies Support Filtre à disque de type cadre avec commande d'eau de dérivation pour empêcher l'eau de dérivation d'être utilisée dans un rétrolavage
CN107115706B (zh) * 2017-06-15 2019-06-11 天津理工大学 一种旋流式污水过滤装置
CN107115706A (zh) * 2017-06-15 2017-09-01 天津理工大学 一种旋流式污水过滤装置
AT16600U1 (de) * 2018-03-19 2020-02-15 Voith Patent Gmbh Scheibenfilter
CN110124376A (zh) * 2019-05-19 2019-08-16 贾新奎 一种污水过滤设备
CN110038332A (zh) * 2019-05-19 2019-07-23 贾新奎 一种污水处理设备
CN110124376B (zh) * 2019-05-19 2021-12-31 内江瑞丰环保科技有限公司 一种污水过滤设备
CN111389080A (zh) * 2020-03-31 2020-07-10 杨辉云 一种风能自动打捞杂质的污水处理装置
CN112973242A (zh) * 2021-02-05 2021-06-18 陈吉辉 一种纺织污水处理装置

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