ZA825390B - Apparatus and method for clarification of water using combined flotation and filtration processes - Google Patents

Apparatus and method for clarification of water using combined flotation and filtration processes

Info

Publication number
ZA825390B
ZA825390B ZA825390A ZA825390A ZA825390B ZA 825390 B ZA825390 B ZA 825390B ZA 825390 A ZA825390 A ZA 825390A ZA 825390 A ZA825390 A ZA 825390A ZA 825390 B ZA825390 B ZA 825390B
Authority
ZA
South Africa
Prior art keywords
clarification
water
filtration processes
combined flotation
flotation
Prior art date
Application number
ZA825390A
Other languages
English (en)
Inventor
Milos Krofta
Original Assignee
Lenox Inst Res
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 Lenox Inst Res filed Critical Lenox Inst Res
Publication of ZA825390B publication Critical patent/ZA825390B/xx

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1431—Dissolved air flotation machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/002—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in parallel connection
    • B01D24/004—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in parallel connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/002—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in parallel connection
    • B01D24/005—Filters being divided into a plurality of cells or compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
    • B01D24/20—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being provided in an open container
    • B01D24/22—Downward filtration, the filter material being supported by pervious surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/38—Feed or discharge devices
    • B01D24/386—Feed or discharge devices internal recirculation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4631—Counter-current flushing, e.g. by air
    • B01D24/4636—Counter-current flushing, e.g. by air with backwash shoes; with nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4631—Counter-current flushing, e.g. by air
    • B01D24/4642—Counter-current flushing, e.g. by air with valves, e.g. rotating valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D37/00—Processes of filtration
    • B01D37/03—Processes of filtration using flocculating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/02—Froth-flotation processes
    • B03D1/028—Control and monitoring of flotation processes; computer models therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1462—Discharge mechanisms for the froth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1475—Flotation tanks having means for discharging the pulp, e.g. as a bleed stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1493—Flotation machines with means for establishing a specified flow pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D3/00—Differential sedimentation
    • B03D3/06—Flocculation
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
ZA825390A 1981-09-15 1982-07-27 Apparatus and method for clarification of water using combined flotation and filtration processes ZA825390B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/302,566 US4377485A (en) 1981-09-15 1981-09-15 Apparatus and method for clarification of water using combined flotation and filtration processes

Publications (1)

Publication Number Publication Date
ZA825390B true ZA825390B (en) 1983-06-29

Family

ID=23168300

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA825390A ZA825390B (en) 1981-09-15 1982-07-27 Apparatus and method for clarification of water using combined flotation and filtration processes

Country Status (18)

Country Link
US (1) US4377485A (xx)
JP (1) JPS5845785A (xx)
AR (1) AR227484A1 (xx)
AU (1) AU553891B2 (xx)
BR (1) BR8205385A (xx)
CA (1) CA1171562A (xx)
CH (1) CH659240A5 (xx)
DE (1) DE3231844A1 (xx)
ES (1) ES515656A0 (xx)
FI (1) FI74696C (xx)
FR (1) FR2512802B1 (xx)
GB (1) GB2105601B (xx)
IN (1) IN158976B (xx)
IT (1) IT1152507B (xx)
MX (1) MX156978A (xx)
SE (1) SE453590B (xx)
TR (1) TR21907A (xx)
ZA (1) ZA825390B (xx)

Families Citing this family (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3138676A1 (de) * 1981-09-29 1983-04-14 Passavant-Werke AG & Co KG, 6209 Aarbergen Filtereinrichtung mit einer einrichtung zum rueckspuelen des filterbettes
JPS60112279A (ja) * 1983-11-18 1985-06-18 松下電工株式会社 ヒ−タ
JPS60149094U (ja) * 1984-03-14 1985-10-03 株式会社村田製作所 発熱体装置
US4673494A (en) * 1984-06-27 1987-06-16 Lenox Institute For Research, Inc. Water treatment apparatus
US4626345A (en) * 1984-09-04 1986-12-02 Lenox Institute For Research, Inc. Apparatus for clarification of water
US4793934A (en) * 1987-04-22 1988-12-27 Signal Environmental Systems, Inc. Method for enhancing the separation capacity of a multi-bed filtration system
US4923600A (en) * 1987-08-28 1990-05-08 Lenox Institute For Research, Inc. Water clarification system adapted for removing particulate matter of greater than a predetermined size
DE3854266T2 (de) * 1988-02-11 1996-02-15 Euratom Verfahren zur Modifizierung eines Molekularsiebes.
JPH059109Y2 (xx) * 1988-06-30 1993-03-05
US5296149A (en) * 1988-09-07 1994-03-22 Milos Krofta Lamellar apparatus and method for clarifying water
US5188729A (en) * 1988-09-07 1993-02-23 Lenox Institute For Research, Inc. Sludge collection apparatus for a water clarifier
US4931175A (en) * 1988-09-07 1990-06-05 Lenox Institute For Research, Inc. Water clarifying apparatus
US5320750A (en) * 1988-09-07 1994-06-14 Milos Krofta Water clarifier with first filtrate isolation, improved backwashing and improved bubble generation
US5268099A (en) * 1988-09-07 1993-12-07 Lenox Institute Of Water Technology, Inc. Lamellar clarifier with rectilinear tank
US5306422A (en) * 1988-09-07 1994-04-26 Lenox Institute Of Water Technology, Inc. Compact clarifier system for municipal waste water treatment
DE4022587A1 (de) * 1989-08-14 1991-04-25 Zapf Werner Kg Mehrere abscheideabteilungen aufweisender leichtfluessigkeitsabscheider
JPH0388294A (ja) * 1989-08-18 1991-04-12 Tsuaitowan Fuaaren Koniejishuien Jiouyuen 強誘電体セラミック発熱素子
DE4007893A1 (de) * 1990-01-06 1991-07-11 Brieden Filtration Gmbh Und Co Vorrichtung zur klaerung von prozesswasser, insbesondere von kuehlwasser mit hilfe eines siebes
US5069783A (en) * 1990-05-16 1991-12-03 Int'l Environmental Systems, Inc. Liquid treatment apparatus
US5256299A (en) * 1990-07-02 1993-10-26 International Environmental Systems, Inc., Usa Method and apparatus for liquid treatment
US5240600A (en) * 1990-07-03 1993-08-31 International Environmental Systems, Inc., Usa Water and wastewater treatment system
US5049320A (en) * 1990-07-03 1991-09-17 International Environmental Systems, Inc. Gas dissolving system and method
US5068031A (en) * 1990-07-06 1991-11-26 Int'l Environmental Systems, Inc. Sludge treatment apparatus
US5190659A (en) * 1990-07-06 1993-03-02 International Environmental Systems Inc. Contamination removal system employing filtration and plural ultraviolet and chemical treatment steps and treatment mode controller
US5084165A (en) * 1990-07-06 1992-01-28 Int'l Environmental Systems, Inc. Water treatment apparatus
US5236595A (en) * 1990-07-06 1993-08-17 International Environmental Systems, Inc., Usa Method and apparatus for filtration with plural ultraviolet treatment stages
US5064531A (en) * 1990-07-26 1991-11-12 Int'l Environmental Systems, Inc. Water filtration apparatus
DE4101332A1 (de) * 1991-01-18 1992-07-23 Ibo W Grimmel Abwassertechnik Vorrichtung zum reinigen von abwasser
CN1040070C (zh) * 1991-05-29 1998-10-07 美商国际环境系统公司 气体溶解和释放液体处理系统
DE4128665C1 (xx) * 1991-08-29 1993-03-04 K-Pack Systems International, Neede, Nl
US5242585A (en) * 1991-09-04 1993-09-07 Lenox Institute For Research, Inc. Apparatus and method for deinking waste paper pulp
US5401405A (en) * 1993-05-24 1995-03-28 Davis Water & Waste Industries, Inc. Combined air/water backwash in a travelling bridge filter
US5415771A (en) * 1993-06-29 1995-05-16 The Lenox Institute Of Water Technology, Inc. High capacity single tank water clarification system
FI97128C (fi) * 1993-12-20 1996-10-25 Oiva Suutarinen Vedenpuhdistuslaitos
IT1269815B (it) * 1994-05-20 1997-04-15 Fabio Perletti Apparato per la chiarificazione spinta di liquidi con particelle solide in sospensione
DE4427432A1 (de) * 1994-08-03 1996-02-08 Hubert Wilz Verfahren und Anordnung zum kontinuierlichen Entfernen von abfilterbaren Stoffen aus einer Flüssigkeit
US5591347A (en) * 1995-05-26 1997-01-07 Unicel, Inc. Single cell gas flotation separator with filter media
US5516434A (en) * 1995-05-26 1996-05-14 Unicel, Inc. Single cell gas flotation separator with filter media
US5656173A (en) * 1996-03-05 1997-08-12 National Tank Company Method of removing dispersed oil from an oil in water emulsion employing aerated solutions within a coalescing media
US5846413A (en) * 1996-04-26 1998-12-08 Lenox Institute Of Water Technology, Inc. Three zone dissolved air flotation clarifier with improved efficiency
US6174434B1 (en) 1996-04-26 2001-01-16 The Lenox Institute Of Water Technology, Inc. Three zone dissolved air floatation clarifier with fixed lamellae and improved paddle-and-ramp sludge removal system
DE19627161B4 (de) * 1996-07-05 2006-02-02 Dieter Frankenberger Verfahren zum Abräumen von Schwimmstoffen und Räumvorrichtung
US6171488B1 (en) * 1997-07-15 2001-01-09 Zpm, Inc. Fluid conditioning system
AT407633B (de) * 1998-11-03 2001-05-25 Lutz Willibald Verfahren zum reinigen von strassentank- und strassensilofahrzeugen, eisenbahnkesselwaggons und tankschiffen
FR2796306B1 (fr) * 1999-07-13 2002-07-26 Roumen Kaltchev Clarificateur a air dissous avec filtre incorpore
GB2392152B (en) * 1999-08-16 2004-09-29 Peter Ignatius Swan Flotation filtration
US6964740B2 (en) * 2002-06-25 2005-11-15 Dwain E. Morse System and method of gas energy management for particle flotation and separation
US6998046B2 (en) * 2002-08-09 2006-02-14 Rg Delaware, Inc. Filter system and methods of operating the same
US7347939B2 (en) * 2002-10-14 2008-03-25 Clean Water Technology, Inc. Adjustable contaminated liquid mixing apparatus
US7157007B2 (en) * 2003-06-20 2007-01-02 National Tank Company Vertical gas induced flotation cell
GB0525878D0 (en) * 2005-12-21 2006-02-01 Rwe Nukem Ltd Sludge removal
EP2134441B1 (en) * 2007-02-13 2012-12-05 FRAM Group IP LLC Additive dispersing filter and method
US9539531B2 (en) 2007-02-13 2017-01-10 Fram Group IP, LLC Additive dispersing filter and method
ES2356953B1 (es) * 2007-06-22 2012-01-25 Acciona Agua, S.A.U. Sistema de flotación de partículas, flóculos y fangos aplicado al pretratamiento de aguas para procesos por osmosis inversa.
US8518266B2 (en) * 2009-11-16 2013-08-27 Rg Delaware, Inc. Dissolved air flotation clarifier
CA2813961C (en) * 2009-12-30 2017-11-07 Fram Group Ip Llc Additive dispersing filter and method
US10005014B2 (en) 2012-01-30 2018-06-26 Fram Group Ip Llc Additive carrier for spin on filters
US9623350B2 (en) 2013-03-01 2017-04-18 Fram Group Ip Llc Extended-life oil management system and method of using same
CN104341065A (zh) * 2013-08-02 2015-02-11 中国水产科学研究院渔业机械仪器研究所 一种电凝聚气浮法净化养鱼污水的工艺
CN104986767B (zh) * 2015-06-03 2017-04-12 河南易成新能源股份有限公司 碳化硅微粉除碳装置及方法
CN105600787B (zh) * 2016-03-21 2017-09-01 平顶山市国邦新材料有限公司 一种碳化硅除杂系统
CN108654151A (zh) * 2018-05-29 2018-10-16 北京中地加荷环境工程有限公司 节电节水无机械搅拌增量提质微涡混凝沉淀澄清池
CN114593619A (zh) * 2022-03-22 2022-06-07 重庆西南赛唯换热设备有限公司 一种钎焊板式换热器

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307701A (en) * 1963-09-05 1967-03-07 Krofta Milos Apparatus for purification of unclarified waste water
DE2044319A1 (en) * 1970-09-08 1972-06-22 Krofta M Effluent treatment - by combined flotation/sedimentation and filtration
CA974335A (en) * 1973-02-19 1975-09-09 Joseph N. Parlette Integral two stage clarifier
GB1440324A (en) * 1973-09-14 1976-06-23 Hartley Simon Ltd Flotation appataus
US4022696A (en) * 1976-03-24 1977-05-10 Milos Krofta Apparatus for clarification of waste water operating on dissolved air flotation process
US4303517A (en) * 1979-01-15 1981-12-01 Sydlo Inc. Liquid treatment apparatus

Also Published As

Publication number Publication date
IT1152507B (it) 1987-01-07
DE3231844C2 (xx) 1989-08-03
GB2105601B (en) 1985-04-11
AU8695482A (en) 1983-03-24
AR227484A1 (es) 1982-10-29
FI74696C (fi) 1988-03-10
CH659240A5 (de) 1987-01-15
SE8205214D0 (sv) 1982-09-13
ES8403840A1 (es) 1984-04-01
SE453590B (sv) 1988-02-15
SE8205214L (sv) 1983-03-16
JPH0148075B2 (xx) 1989-10-17
CA1171562A (en) 1984-07-24
MX156978A (es) 1988-10-18
ES515656A0 (es) 1984-04-01
FR2512802B1 (fr) 1986-04-25
DE3231844A1 (de) 1983-03-31
FI823155A0 (fi) 1982-09-13
FR2512802A1 (fr) 1983-03-18
US4377485A (en) 1983-03-22
IT8222949A0 (it) 1982-08-24
IN158976B (xx) 1987-02-28
TR21907A (tr) 1985-10-31
AU553891B2 (en) 1986-07-31
GB2105601A (en) 1983-03-30
JPS5845785A (ja) 1983-03-17
FI74696B (fi) 1987-11-30
BR8205385A (pt) 1983-08-23

Similar Documents

Publication Publication Date Title
ZA825390B (en) Apparatus and method for clarification of water using combined flotation and filtration processes
DE3276308D1 (en) Flocculant aid and process for water purification
DE3162020D1 (en) Method and apparatus for the denitrification of water
IL65869A0 (en) Method of and means for concentrating brine
ZW16482A1 (en) Filtration thickening method and apparatus
IL66785A (en) Apparatus and method for purification of liquids
GB2085743B (en) Method of filtering sewer scum and apparatus therefor
GB2132502B (en) Method and apparatus for the removal of oxygen from water
DE3269871D1 (en) Method and apparatus for purifying liquid
ZA856666B (en) Process of and apparatus for ultrafiltration
GB2105700B (en) Method of and apparatus for separating rinsing liquid from solid matter
GB2190854B (en) Method and apparatus for separating oil and water
PL254310A1 (en) Method of introducing sludge and apparatus therefor
DE3463367D1 (en) Process and apparatus for the biological purification of waste water
AU4065885A (en) Method and apparatus for desalination and/or purification of water
JPS5790137A (en) Method of and apparatus for preparing waste water for analysis
JPS57209605A (en) Reverse osmosis separation method and apparatus of liquid mixture or solution
DE3276790D1 (en) Apparatus and process for separating solids of different shapes
DE3270866D1 (en) Method and apparatus for separating matter from polluted water
PL252991A1 (en) Method of continuously filtering liquids and apparatus therefor
PL241249A1 (en) Method of biological sewage-treatment and apparatus therefor
JPS57128141A (en) Method and apparatus for dilating clogged part of vessel
ZA88868B (en) Method and apparatus for the purification of water
IL67612A0 (en) Method and apparatus for filtration of liquids
AU8588382A (en) Method and apparatus for the purification of water